WO2008076783A2 - Composition and method for improved aluminum hydroxide production - Google Patents
Composition and method for improved aluminum hydroxide production Download PDFInfo
- Publication number
- WO2008076783A2 WO2008076783A2 PCT/US2007/087344 US2007087344W WO2008076783A2 WO 2008076783 A2 WO2008076783 A2 WO 2008076783A2 US 2007087344 W US2007087344 W US 2007087344W WO 2008076783 A2 WO2008076783 A2 WO 2008076783A2
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- WO
- WIPO (PCT)
- Prior art keywords
- crystal growth
- growth modifier
- fatty acid
- aluminum hydroxide
- liquor
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process
- C01F7/145—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process characterised by the use of a crystal growth modifying agent other than aluminium hydroxide seed
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
- C01F7/47—Purification of aluminium oxide, aluminium hydroxide or aluminates of aluminates, e.g. removal of compounds of Si, Fe, Ga or of organic compounds from Bayer process liquors
- C01F7/473—Removal of organic compounds, e.g. sodium oxalate
Definitions
- the present invention relates to improved recovery of aluminum values from the Bayer process or to a precipitation liquor.
- the invention relates to the compositions and methods providing the increase of particle size of aluminum hydroxide product without a significant decrease in precipitation yield.
- Aluminum hydroxide is produced on an industrial scale by well-established methods, such as the Bayer Process.
- the process operators optimize their methods so as to produce the greatest possible yield from the aluminate process liquors while trying to achieve a given crystal size distribution of aluminum hydroxide product. It is desirable in most instances to obtain the product of relatively large crystal size since this is beneficial in subsequent processing steps required to produce aluminum metal.
- Production is often limited by processing conditions under which the crystallization and precipitation is conducted. These processing conditions vary from one plant to the next and include, but are not limited to, temperature profiles, seed charge, seed crystal surface area, purge of carbon dioxide or flue gases, liquor loading, liquor purity, and the like.
- a water-soluble crystal growth modifier formulation comprising a first composition of a polyalkoxylated non-ionic surfactant and a second composition comprising a surfactant, or a precursor thereof, which is not polyalkoxylated.
- Ethylene oxide (EO) units are identified as essential components of the formulation in the polyalkoxylated non-ionic surfactant, preferably, ethylene oxide and propylene oxide (PO) units which form an ethylene oxide-propylene oxide block copolymer.
- the '767 patent discloses a composition which contains "substantially no mineral oil or silicone oil” and emphasizes regularly that the "advantage of the crystallization modifiers . . . is that they do not require the presence of oils.” (e.g., see column 2, lines 21-25; col. 4, lines 25-35; col. 5, lines 21-33).
- the cost effectiveness of these components and their acceptance when compared to the surfactant/oil blends used in the majority of crystallization modifier formulations in most Bayer processing plants today remains questionable.
- oxalate also affecting the particle size and product yield parameters in alumina recovery is the presence of oxalate in the pregnant liquor.
- Sodium oxalate often crystallizes and precipitates from the liquor over essentially the same temperature profiles as does the desirable aluminum hydroxide product. If left undealt with, oxalate is a contaminate that can act as a seed site resulting in generation of too many small hydroxide crystals, thereby lowering average particle size of the aluminum hydroxide product, hi addition, oxalate crystals may adhere to the surfaces of growing aluminum hydroxide and incorporate within the precipitated product. This further leads to the development of excessive amounts of extremely finely divided aluminum hydroxide in the aluminum hydroxide washing and calcination processes that follow. Therefore, effective removal of oxalate from the system is crucial for manufacturing of a high quality aluminum hydroxide product.
- untreated precipitation liquors yield sodium oxalate crystals with needle like morphology.
- One of the effective ways of removing oxalate is to force it crystallize as spherical agglomerates of such needles also known as "oxalate balls.”
- Oxalate balls co-precipitate with aluminum hydroxide product and can be removed by screening. The effectiveness of screening is higher when oxalate balls are larger in size. Still, if the balls bear in-grown aluminum hydroxide inclusions, screening may also remove useful aluminum values. Thus, the formation of oxalate balls that are larger and substantially free from incorporated aluminum values is most desirable.
- a method of such resolution suitable for obtaining aluminum hydroxide crystals with increased particle size and yield, while facilitating oxalate removal is provided by the present invention.
- the present disclosure provides for a process for recovering aluminum hydroxide crystals from a precipitation liquor comprising the steps of: (a) preparing a crystal growth modifier comprising: (1) a C 8 to Qo fatty acid, precursor, salt or blends thereof, (2) an oil carrier, wherein said oil carrier content of said modifier is at least about 15% by weight, and (3) water; (b) emulsifying the crystal growth modifier; and (c) adding the emulsified crystal growth modifier to the precipitation liquor.
- the present disclosure also provides for aluminum hydroxide crystals produced by a process comprising adding a crystal growth modifier to a precipitation liquor wherein the crystal growth modifier comprises one of either: (a) a surfactant fatty acid, precursor, salt or blends thereof, the fatty acid having an alkyl chain length of C 8 to Cso carbon atoms free of functional groups, dissolved in an oil having a boiling point above about 200° F, and emulsified in water; or (b) a surfactant fatty acid, precursor, salt or blends thereof, the fatty acid having an alkyl chain length of C 8 to C 1O carbon atoms, the carbon atoms free of functional groups, and emulsified in water.
- the crystal growth modifier comprises one of either: (a) a surfactant fatty acid, precursor, salt or blends thereof, the fatty acid having an alkyl chain length of C 8 to Cso carbon atoms free of functional groups, dissolved in an oil having a boiling point above about 200° F, and e
- the present invention further provides for aluminum hydroxide crystals produced by a process comprising adding a crystal growth modifier to the precipitation liquor, wherein the crystal growth modifier comprises: (a) a surfactant fatty acid, precursor, salt or blends thereof, said fatty acid having an alkyl chain length of C 8 to C 1 O carbon atoms, said carbon atoms free of functional groups; (b) an oil having a boiling point above about 200° F in which the fatty acid is dissolved; (c) an emulsifier in an amount no greater than about 50% by weight; (d) a pH-adjuster; and (e) water in an amount within the range of from 0% to about 85% by weight.
- the crystal growth modifier comprises: (a) a surfactant fatty acid, precursor, salt or blends thereof, said fatty acid having an alkyl chain length of C 8 to C 1 O carbon atoms, said carbon atoms free of functional groups; (b) an oil having a boiling point above about 200° F in which the fatty acid is
- the present invention further provides for a process for recovering aluminum hydroxide crystals from a precipitation liquor comprising the steps of: (a) preparing a crystal growth modifier comprising: (1) a C 8 to C 1O fatty acid, precursor, salt or blends thereof, (2) an oil carrier, wherein said oil carrier content of said modifier is at least about 15% by weight, and (3) water; (b) emulsifying the crystal growth modifier; and (c) adding the emulsified crystal growth modifier to the precipitation liquor.
- the present invention further provides for an emulsified crystal growth modifier comprising: a C 8 to C 1O fatty acid, precursor, salt or blends thereof; an oil carrier, wherein said oil carrier content of said modifier is at least about 15% by weight; and water.
- the present invention further provides for a Bayer process for producing aluminum hydroxide crystals having a reduced formation of product fines concurrent with an upward shift in particle size distribution of aluminum hydroxide and an upward shift in oxalate ball size, the process comprising the addition of an emulsified crystal growth modifier to a precipitation liquor comprising: a Cg to C 1 O fatty acid, precursor, salt or blends thereof; an oil carrier, wherein said oil carrier content of said modifier is at least about 15% by weight; and water.
- a precipitation liquor comprising: a Cg to C 1 O fatty acid, precursor, salt or blends thereof; an oil carrier, wherein said oil carrier content of said modifier is at least about 15% by weight; and water.
- FIGURE 1 Scanning electron microscope (SEM) images of crystal products from blank tests conducted without a crystal growth modifier.
- FIGURE 2 SEM images of crystal products from the tests conducted using Commercial Product.
- FIGURE 3 SEM images of crystal products from the tests conducted using Composition E.
- BET Refers to the Brunauer-Emmett-Teller method for experimental determination of surface area. The method employs the analysis of adsorption isotherm of nitrogen or other gases on the material.
- Oil carrier Describes a hydrophobic liquid that can be comprised of the aliphatic or aromatic compounds such as paraffinic oils, naphthenic oils, or fuel oils.
- bottoms or residual waste materials remaining from the production of alkyl alcohols represent a suitable hydrophobic liquid.
- the preferred waste material is the ClO alcohol distillation residue having a boiling point of about 250° C. (482° F). It is light yellow to yellowish brown in color and has a specific gravity of about 0.862, OH- number about 90, SAP No. about 50, weight percent acetic about 0.07 and carbonyl about 0.5. Chemically, it is 57-73 weight percent of primary branched chain ClO -C22 alcohols (classed as fatty alcohols) and 29-41 weight percent of mixed long chain esters and ethers (C 18 -C33 ester; C 18 -C22 ether).
- the materials suitable as an oil carrier can be used neat or in a mixture of any proportion.
- the oil carrier needs only be a solvent for the fatty acid and have a boiling point safely above the temperature of the hot aluminate liquor undergoing precipitation (about 80 0 C, 176° F).
- Weight percent ratio The total weight fraction of one reagent within 100 grams of the composition or mixture. The corresponding fraction of the other component is the latter subtracted from 100.
- Percent (%) increase over control quantile particle size The particle size distribution is conventionally given by the three quantiles, d(0.1), d(0.5) and d(0.9). Thus, 10%, 50% and 90%, respectively, of the total particle volume (or mass) is less than the size given in the tables.
- the percent (%) increase over the control quantile particle size is the difference between the quantiles particle sizes obtained in the tests with a CGM and control divided by the control quantile particle size.
- Effective amount An effective amount is deemed any dosage of any additive that affords an increase in one of the three quantiles when compared to an ⁇ ndosed control sample.
- Precipitation liquor Refers to an aluminate containing liquor in an aluminum hydroxide precipitation step of an alumina production process.
- the aluminate liquor may be referred to as various terms known to those of ordinary skill in the art, for example, pregnant liquor, green liquor, and aluminum hydroxide precipitation feed.
- precipitation liquor may also include the aluminate solution directed to decomposition in a sintering - carbonation process or combined Bayer-sintering process as accomplished by the methods well known to those skilled in the art as described, for example, in US. Pat. Nos. 4,256,709 and 3,642,437 and RU. Pat. Nos. 2,184,703, 2,257,347, and 2,181,695, which are herein incorporated by reference.
- Precipitation feed liquor refers to the precipitation liquor that flows into a precipitator of an aluminum hydroxide precipitation process.
- Heated precipitation liquor Any liquor within the aluminum hydroxide production process having a free alkalinity level above 50 g/L OfNa 2 COs and a temperature above ambient or 25°C.
- Spent liquor Describes the liquor resulting from the removal of precipitated aluminum values, such as the spent liquor after the final classification stage that returns back to digestion in the Bayer process.
- Precipitation test procedure Each set of tests was run using fresh pregnant liquor, obtained from the reconstitution of plant spent liquor. A desired weight of spent liquor was measured into a stainless steel beaker and the volume was reduced by evaporation to about 30%. To this a set weight of aluminum hydroxide solid was added and the mixture stirred until it was dissolved. This solution was removed from the hot plate and placed on a weighing balance and de-ionized water added until a desired weight was attained. The pregnant liquor was filtered to remove any insoluble material. All precipitation tests were performed in 250-mL Nalgene® bottles rotated end-over-end, at 10 rpm, in an Intronics temperature-controlled water bath.
- the additive was dosed, with respect to the total surface area of the seed crystals (mg/m 2 ), to the lid of the appropriate bottles using a micro-syringe and the bottles were then placed in the rotating bath for equilibration at 72°C (20 minutes). After equilibration, the bottles were removed, quickly charged with the required quantity of seed (50 g/L, based on liquor volume) and immediately returned to the water bath. The temperature of the water bath was set to 72°C. The bottles were rotated overnight for 15 hours.
- the precipitation liquor is located in the Bayer process.
- the prepared crystal growth modifier in the present disclosure contains a fatty acid, an oil carrier, and water.
- Prepared crystal growth modifiers of the present disclosure contain fatty acids having various forms or combination of forms.
- the fatty acid alkyl chain can be saturated, unsaturated, branched, unbranched, substituted, or a combination thereof.
- said fatty acid has carbon backbone that is free of functional groups.
- the crystal growth modifier treatment of the present invention incorporates a C8-10 fatty acid blend.
- the suitable blend is available from Procter and Gamble under the trade name C-810L. This blend has an average molecular of 154 g/mol and an approximate composition of the following fatty acid chain lengths: Ce ⁇ 6%, Cg 53 - 60%, Cjo 34 - 42% and Ci 2 ⁇ 2%. Many other commercial fatty acid products are known to those skilled in the art and would work for the present invention.
- the proposed CGM treatment can also be prepared as a 150 g/L solution of the fatty acid blend in a paraffinic oil carrier. Appropriate paraffinic oil is available from Exxon Mobil Corporation under the trade name Escaid l lO.
- Prepared crystal growth modifiers of the present disclosure may contain various amounts of oil carrier content.
- the oil carrier content of said crystal growth modifier is from about
- the oil carrier content of said crystal growth modifier is from about 20% to about 50% by weight.
- the oil carrier content of said crystal growth modifier is from about 15% to about 99% by weight.
- Prepared crystal growth modifiers of the present disclosure may contain various amounts of water content.
- the water content of the crystal growth modifier is in the range of from about 30% to about 60% by weight
- the prepared crystal growth modifier is emulsified prior to its addition to the precipitation liquor.
- the crystal growth modifier may be prepared as a water-in-oil or oil-in-water emulsion.
- an emulsion can be created by a mechanical stimulus, such as agitation, a chemical stimulus, such as by pH change of a mixture, or a combination thereof.
- Crystal growth modifiers prepared as microemulsions are a preferred form of addition to the precipitation liquor.
- Microemulsions are significantly different in structure from regular emulsions.
- Regular emulsions are comprised of separate oil droplets in water or water droplets in oil with a sharp transition between the two phases.
- Microemulsions have a particle size in the range from 10 to 600 nm, so that they appear as clear or opalescent one-phase formulations.
- microemulsions are thermodynamically stable. This means that microemulsions form spontaneously when the components are brought together and stay stable as long as the components are intact. Thus, their manufacturing may be reduced to simple kneading without the need for expensive high energy mixing. Also, microemulsions are not prone to separation or settling, which results in their long storage stability. Only gentle mixing is required to restore microemulsions upon their freezing or high temperature exposure.
- the emulsified crystal growth modifier may be introduced into the precipitation liquor via various routes.
- the emulsified crystal growth modifier is added to the precipitation liquor at the following steps of a Bayer process: a) to a precipitation feed liquor, b) to a seed slurry, c) directly into a precipitation tank, and d) a combination thereof.
- the emulsified crystal growth modifier can be added to the precipitation liquor via various modes of addition. In-line injection of the emulsified crystal growth modifier is one mode of addition.
- the amount of crystal growth modifier required to produce desirable effect depends upon the precipitation process parameters. Most often, this amount is determined by the surface area of available hydrated alumina solids in the precipitation liquor.
- the solids comprise the aluminum hydroxide introduced as seed or originated as new crystals or agglomerates during the decomposition of precipitation liquor.
- the suitable amount of crystal growth modifier can range from about 0.01 to about 30 mg per square meter of the available aluminum hydroxide seed area, and preferably, from about 0.1 to about 15 mg per square meter. Commonly, less than about 8 mg/m 2 of CGM can be used.
- the precipitation operators can dose the crystal growth modifier by the volume.
- the crystal growth modifier amount may range from about 0.01 to about 400 mg/liter of precipitation liquor, preferably from about 0.05 to about 200 mg /liter of precipitation liquor. Commonly less than about 100 mg/liter of CGM can be used.
- the addition of the crystal growth modifier product to the precipitation liquor reduces the percent of alumina trihydrate crystal fines formed in the Bayer process substantially without any decrease in the overall product yield and thereby increases the yield of alumina trihydrate crystals of optimal particle size for aluminum metal production. An upward shift in oxalate ball size also occurs.
- the addition of emulsified crystal growth modifier results in at least half of the recovered crystals by weight exceed 325 mesh (44-45 microns).
- the oxalate balls precipitate to a size in the range of from about 200 to about 10,000 ⁇ m.
- the oxalate balls precipitate to a size in the range of about 300 ⁇ m.
- the addition of crystal growth modifier also provides a more effective Bayer process wherein the yield of coarser alumina trihydrate particles is increased, and the separation and collection of alumina trihydrate from the alkaline liquor is improved.
- the oxalate balls and said aluminum hydroxide crystals may be separated by various separation techniques.
- the separation occurs with a separation method containing one or more screens. In another embodiment, the separation occurs with a separation method containing one or more cyclones.
- the fatty acids of higher than 98% purity with a linear chain in the range from CA to C18 were purchased from Sigma-Aldrich Corporation (www.aldrich.com).
- the fatty acids included butanoic, hexanoic, octanoic, decanoic, tetradecanoic, and octadecanonic.
- the precipitation temperature was 72° C, holding time 15 hours, and seed charge 50 g/L.
- the seed was the C31 alumina trihydrate with BET specific surface area of 0.38 m 2 /g.
- the crystal compositions were prepared as 15% solutions of individual fatty acids in 85% paraffinic solvent available from Exxon Mobil Corporation under the trade name Escaid 110.
- the crystal growth modifier compositions were tested at the equal dose of 3 mg per square meter of seed surface (60 ppm vs. green liquor).
- Composition A (waterless solution): 15% C8-10 fatty acid blend available from Proctor and Gamble Chemicals under the trade name C-810L,
- Composition B (microemulsion):
- test conditions were the same as previously, except for the compositions were tested at three different dosages.
- Composition C is a composition having Composition C:
- Table 3 shows that the emulsions represented by Compositions C, and D provide the coarsening performance equal or exceeding that of Commercial Product at every corresponding dosage level in each of the three quantiles listed.
- the improved crystal growth modifier compositions help sodium oxalate crystallize into larger balls that are substantially free of aluminum hydroxide inclusions. Formation of larger balls facilitates the removal of oxalate from the process liquor while the purity of the balls prevents the loss of desirable aluminum values.
- the tests used aluminum hydroxide seed of coarse and fine sizes procured from a North American alumina plant as well as the C31 seed as listed in Table 4.
- the initial spent liquor from the plant contained 3.2 g/L sodium oxalate.
- this liquor was additionally spiked with 0.5 g/L sodium oxalate to reach the total sodium oxalate concentration of 3.7 g/L in the test liquor at the beginning of the tests.
- the sodium oxalate concentrations in the test liquor before and after the test are listed in TABLE 5.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07855115A EP2094609A4 (en) | 2006-12-18 | 2007-12-13 | Composition and method for improved aluminum hydroxide production |
BRPI0718723-8A BRPI0718723B1 (en) | 2006-12-18 | 2007-12-13 | PROCESS FOR RECOVERY OF ALUMINUM HYDROXIDE CRYSTALS FROM A PRECIPITATION LIQUOR |
AU2007334021A AU2007334021B2 (en) | 2006-12-18 | 2007-12-13 | Composition and method for improved aluminum hydroxide production |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/612,031 US7976821B2 (en) | 2005-06-23 | 2006-12-18 | Composition and method for improved aluminum hydroxide production |
US11/612,031 | 2006-12-18 |
Publications (2)
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WO2008076783A2 true WO2008076783A2 (en) | 2008-06-26 |
WO2008076783A3 WO2008076783A3 (en) | 2008-08-07 |
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PCT/US2007/087344 WO2008076783A2 (en) | 2006-12-18 | 2007-12-13 | Composition and method for improved aluminum hydroxide production |
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US (2) | US7976821B2 (en) |
EP (1) | EP2094609A4 (en) |
AU (1) | AU2007334021B2 (en) |
BR (1) | BRPI0718723B1 (en) |
RU (1) | RU2458009C2 (en) |
WO (1) | WO2008076783A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011002952A2 (en) * | 2009-07-01 | 2011-01-06 | Nalco Company | A composition and method for enhancing the production of crystal agglomerates from a precipitation liquor |
WO2018048820A1 (en) * | 2016-09-09 | 2018-03-15 | Cytec Industries Inc. | Oil-free crystal growth modifiers for the bayer process |
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US8971913B2 (en) * | 2003-06-27 | 2015-03-03 | Qualcomm Incorporated | Method and apparatus for wireless network hybrid positioning |
US9199855B2 (en) | 2010-08-09 | 2015-12-01 | Nalco Company | Chemical treatment to improve red mud separation and washing in the bayer process |
US9102995B2 (en) | 2010-08-09 | 2015-08-11 | Nalco Company | Cross-linked ethylsulfonated dihydroxypropyl cellulose |
US8298508B2 (en) | 2010-08-09 | 2012-10-30 | Nalco Company | Recovery of alumina trihydrate during the bayer process using cross-linked polysaccharides |
US9987226B2 (en) * | 2010-12-10 | 2018-06-05 | Ns Technologies Pty Ltd | Methods for forming miniemulsions and use thereof for delivering bioactive agents |
US8926939B2 (en) | 2013-03-13 | 2015-01-06 | Ecolab Usa Inc. | Neopolyols suitable for crystal growth modification in the Bayer process |
US9592456B2 (en) | 2015-02-11 | 2017-03-14 | Ecolab Usa Inc. | Methods for enhancing production of aluminum hydroxide in an aluminum hydroxide production process |
EA033081B1 (en) | 2015-03-11 | 2019-08-30 | Сайтек Индастриз, Инк. | Oil-free crystal growth modifiers for alumina recovery |
US10427950B2 (en) | 2015-12-04 | 2019-10-01 | Ecolab Usa Inc. | Recovery of mining processing product using boronic acid-containing polymers |
CN108083305B (en) * | 2017-12-29 | 2020-01-14 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | System and process for recovering aluminum hydroxide from mold-stewing liquid |
CN109292804A (en) * | 2018-12-03 | 2019-02-01 | 广西华银铝业有限公司 | A kind of minimizing technology of alumina producing Oxalate |
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SU1097560A1 (en) * | 1982-07-27 | 1984-06-15 | Уральский Филиал Всесоюзного Научно-Исследовательского И Проектного Института Алюминиевой,Магниевой И Электродной Промышленности | Method for decomposing aluminate solutions |
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RU2231497C1 (en) * | 2002-11-13 | 2004-06-27 | Открытое акционерное общество "Всероссийский алюминиево-магниевый институт" | Aluminate solution decomposition method |
US7976820B2 (en) * | 2005-06-23 | 2011-07-12 | Nalco Company | Composition and method for improved aluminum hydroxide production |
US7955589B2 (en) * | 2005-06-23 | 2011-06-07 | Nalco Company | Composition and method for improved aluminum hydroxide production |
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2006
- 2006-12-18 US US11/612,031 patent/US7976821B2/en active Active
-
2007
- 2007-12-13 WO PCT/US2007/087344 patent/WO2008076783A2/en active Application Filing
- 2007-12-13 RU RU2009121627/05A patent/RU2458009C2/en active
- 2007-12-13 EP EP07855115A patent/EP2094609A4/en not_active Withdrawn
- 2007-12-13 AU AU2007334021A patent/AU2007334021B2/en not_active Expired - Fee Related
- 2007-12-13 BR BRPI0718723-8A patent/BRPI0718723B1/en active IP Right Grant
-
2011
- 2011-04-28 US US13/096,018 patent/US20110200503A1/en not_active Abandoned
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011002952A2 (en) * | 2009-07-01 | 2011-01-06 | Nalco Company | A composition and method for enhancing the production of crystal agglomerates from a precipitation liquor |
WO2011002952A3 (en) * | 2009-07-01 | 2011-04-28 | Nalco Company | A composition and method for enhancing the production of crystal agglomerates from a precipitation liquor |
US8282689B2 (en) | 2009-07-01 | 2012-10-09 | Nalco Company | Composition and method for enhancing the production of crystal agglomerates from a precipitation liquor |
US8784509B2 (en) | 2009-07-01 | 2014-07-22 | Nalco Company | Composition for enhancing the production of crystal agglomerates from a precipitation liquor |
AU2010266256B2 (en) * | 2009-07-01 | 2015-07-30 | Nalco Company | A composition and method for enhancing the production of crystal agglomerates from a precipitation liquor |
WO2018048820A1 (en) * | 2016-09-09 | 2018-03-15 | Cytec Industries Inc. | Oil-free crystal growth modifiers for the bayer process |
Also Published As
Publication number | Publication date |
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EP2094609A2 (en) | 2009-09-02 |
BRPI0718723B1 (en) | 2018-05-22 |
RU2458009C2 (en) | 2012-08-10 |
AU2007334021A1 (en) | 2008-06-26 |
WO2008076783A3 (en) | 2008-08-07 |
EP2094609A4 (en) | 2012-03-28 |
BRPI0718723A2 (en) | 2013-12-03 |
AU2007334021B2 (en) | 2013-11-07 |
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RU2009121627A (en) | 2011-01-27 |
US20070172405A1 (en) | 2007-07-26 |
US7976821B2 (en) | 2011-07-12 |
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