CN100396383C - Coarse-fine red mud grading method - Google Patents
Coarse-fine red mud grading method Download PDFInfo
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- CN100396383C CN100396383C CNB2005102005585A CN200510200558A CN100396383C CN 100396383 C CN100396383 C CN 100396383C CN B2005102005585 A CNB2005102005585 A CN B2005102005585A CN 200510200558 A CN200510200558 A CN 200510200558A CN 100396383 C CN100396383 C CN 100396383C
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Abstract
The present invention provides a grading method for coarse red mud and fine red mud. When high-iron gibbsite is used as raw materials in alumina production, digested slurry from a digesting process step and red mud washing liquid from a sedimentation process step together are added to a dilution tank, and the slurry is diluted and then loaded into a hydrocyclone group for grading coarse red mud and fine red mud; the slurry flows into a coarse red mud slurry tank through the bottom of each hydrocyclone and is sent to a coarse red mud processing system of the sedimentation process step; the slurry overflows into a fine red mud slurry tank through each hydrocyclone and is sent to a fine red mud processing system of the sedimentation process step. When the method provided by the present invention is used, the problems existing in the separation and the washing of the high-iron gibbsite mixture of coarse red mud and fine red mud are solved, the sedimentation process step for red mud realizes normal operation, and the phenomenon that the bottom of a sedimentation tank is blocked does not occur.
Description
Technical field:
The present invention relates to the coarse-fine red mud grading method in a kind of aluminum oxide production process, the coarse-fine red mud grading method when particularly being raw material production aluminium oxide with the high-iron gibbsite.
Background technology:
China's alumina producer mainly is raw material with the diaspore, Shandong Aluminium Industrial Corp, Shandong Chiping alumina producer also use external bauxite trihydrate to be raw material, in process of production, because the ore type difference, the dissolving out capability difference is bigger, to the fineness requirement difference of raw material mill ore grinding.The diaspore dissolving out capability is the poorest, so mog is also the thinnest, the general requirement is ground to below 200 orders, and external gibbsite dissolving out capability is quite a lot of, and mog is generally 120～80 orders.
Part provinces and regions, China south high-iron gibbsite reserves are very abundant, find in the test that its dissolving out capability is very good, the technological requirement mog can not grind too carefully as domestic existing alumina producer, find through experimental study, mog is controlled at 100% and get final product by 20 orders, and as if grinding too carefully, a large amount of silicon will participate in chemical reaction, cause aluminium oxide reduction in the ore on the contrary, alkaline consumption increases.
Because the grinding particle size of high-iron gibbsite is thicker, raw ore slurry by the stripping operation after, its red mud granularity is also thicker, the red-mud settlement operation can't normally be moved, thick red mud can cause the subsider bottom to stop up, stripping slurry and red mud separating, washing must adopt the specially treated measure, can guarantee that the red mud separating, washing operation normally moves.The existing red-mud settlement separating, washing technology of domestic alumina producer can't resolve the difficult problem that the high-iron gibbsite thickness is mixed red mud separating, washing.
Summary of the invention:
The objective of the invention is to: a kind of coarse-fine red mud grading method is provided, stripping slurry carries out the thickness shunting earlier, and then thick red mud slip, thin red mud slip be sent to coarse-fine red mud separating, washing operation respectively, so that follow-up red-mud settlement operation can normally be moved.
The present invention is achieved in that with the high-iron gibbsite when being raw material production aluminium oxide, before stripping slurry advances the red mud separating, washing operation, increase and build the red mud grading operation: from the next stripping slurry of stripping operation, together add the dilution trap with the red mud wash liquor that comes from the sedimentation operation, the dilution slip is sent the hydrocyclone group again to and is carried out coarse-fine red mud grading, the hydrocyclone underflow advances thick red mud slurry vessel, send the sedimentation operation thick red mud treatment system, thin red mud slurry vessel is advanced in the hydrocyclone overflow, send the sedimentation operation thin red mud treatment system.
Dilution slip available classification feed pump is sent to the hydrocyclone group; Thick, thin red mud after the classification is used thick red mud pump, thin respectively
It is 120～160g/l that the hydroclone classification charging contains admittedly, and it is 800～900g/l that the hydroclone classification underflow contains admittedly, and it is 70～100g/l that the hydroclone classification overflow contains admittedly.
The hydrocyclone inlet pressure is controlled at 0.1Mpa.Used hydrocyclone specification is φ 300～500mm.
The equipment that the present invention selects for use all is alumina industry equipment commonly used, and hydrocyclone, grader feed pump, thick red mud shurry pump, thin red mud shurry pump all are standard universal equipment, can determine specification of equipment according to the design scale and the mass flow of alumina producer.Dilution trap, thick red mud slurry vessel, thin red mud slurry vessel belong to alumina industry flat mechanical agitating tank commonly used, can determine the trough specification according to mass flow.
In addition, also available MIG mechanical agitating tank replaces the hydrocyclone group dilution slip is carried out classification, this mechanical agitating tank belongs to common equipment at alumina producer, rotating speed (different because of the trough diameter, rotation speed change is bigger, and the agitator linear velocity is advisable in 1.2～2.0m/s scope) by the control agitator, make in the dilution slip thick red mud and thin red mud at the groove internal classification, the groove bottom is thick red mud slip, and groove top is thin red mud slip, handles toward the red mud separating, washing operation with pumping respectively.
Adopt the red mud after method provided by the invention is carried out thickness grading, be sent to coarse-fine red mud separating, washing operation respectively, the red-mud settlement operation is normally moved, also can not caused subsider bottom phenomenon of blocking, solve the difficult problem that the high-iron gibbsite thickness is mixed red mud separating, washing.
Description of drawings:
Fig. 1 is the coarse-fine red mud grading process chart.
The specific embodiment:
Embodiments of the invention 1: from the next stripping slurry of stripping operation, together add the dilution trap with the red mud wash liquor that comes from the sedimentation operation, the dilution slip is sent the hydrocyclone group to the classification feed pump and is carried out coarse-fine red mud grading, used hydrocyclone specification is φ 400mm, hydrocyclone inlet pressure 0.1Mpa, it is 120～160g/l that the hydroclone classification charging contains admittedly.After the classification, it is 800～900g/l that the hydrocyclone underflow contains admittedly, advances thick red mud slurry vessel, with the thick red mud treatment system of thick red mud pumping sedimentation operation, it is 70～100g/l that the hydrocyclone overflow contains admittedly, advances thin red mud slurry vessel, with the thin red mud treatment system of thin red mud pumping sedimentation operation.
Embodiments of the invention 2: replace the hydrocyclone group with the MIG mechanical agitating tank dilution slip is carried out classification, the agitator linear velocity is controlled at 1.2～2.0m/s, and other method of operating is with embodiment 1.
Claims (7)
1. coarse-fine red mud grading method, it is characterized in that: when with the high-iron gibbsite being raw material production aluminium oxide, from the next stripping slurry of stripping operation, together add the dilution trap with the red mud wash liquor that comes from the sedimentation operation, the dilution slip is sent the hydrocyclone group again to and is carried out coarse-fine red mud grading, and the hydrocyclone underflow advances thick red mud slurry vessel, send the sedimentation operation thick red mud treatment system, thin red mud slurry vessel is advanced in the hydrocyclone overflow, send the sedimentation operation thin red mud treatment system.
2. coarse-fine red mud grading method according to claim 1 is characterized in that: the dilution slip is sent to the hydrocyclone group with the classification feed pump; Thick, thin red mud after the classification uses thick red mud pump, thin red mud pumping toward the red mud separating, washing operation respectively.
3. coarse-fine red mud grading method according to claim 1 is characterized in that: it is 120～160g/l that the hydroclone classification charging contains admittedly; It is 800～900g/l that the hydroclone classification underflow contains admittedly; It is 70～100g/l that the hydroclone classification overflow contains admittedly.
4. coarse-fine red mud grading method according to claim 1 is characterized in that: hydrocyclone inlet pressure 0.1Mpa.
5. according to claim 1,3 or 4 described coarse-fine red mud grading methods, it is characterized in that: used hydrocyclone specification is φ 300～500mm.
6. coarse-fine red mud grading method according to claim 1 is characterized in that: replace the hydrocyclone group with the MIG mechanical agitating tank dilution slip is carried out classification.
7. coarse-fine red mud grading method according to claim 6 is characterized in that: the linear velocity of MIG mechanical agitating tank is 1.2～2.0m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102005585A CN100396383C (en) | 2005-09-22 | 2005-09-22 | Coarse-fine red mud grading method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102005585A CN100396383C (en) | 2005-09-22 | 2005-09-22 | Coarse-fine red mud grading method |
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| CN1743077A CN1743077A (en) | 2006-03-08 |
| CN100396383C true CN100396383C (en) | 2008-06-25 |
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| CNB2005102005585A Expired - Fee Related CN100396383C (en) | 2005-09-22 | 2005-09-22 | Coarse-fine red mud grading method |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371248C (en) * | 2006-07-16 | 2008-02-27 | 山东铝业股份有限公司 | Red mud separating method for alumina producing Bayer process |
| CN101648770B (en) * | 2008-08-12 | 2011-09-28 | 沈阳铝镁设计研究院有限公司 | Red mud desanding method and system in alumina production |
| CN109439023A (en) * | 2018-11-07 | 2019-03-08 | 张勇 | A technique for functional filler production is carried out using red mud |
| CN111589572A (en) * | 2020-05-21 | 2020-08-28 | 金建工程设计有限公司 | Process for recovering iron ore concentrate and ore sand from alumina red mud |
| CN113369006A (en) * | 2021-06-11 | 2021-09-10 | 中铝环保节能集团有限公司 | Low-cost and efficient red mud iron separation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6033579A (en) * | 1994-10-14 | 2000-03-07 | Andritz-Patentverwaltungs-Gesellschaft M.B.H | Red mud dewatering and washing process |
| CN1370741A (en) * | 2002-03-26 | 2002-09-25 | 贵州铝厂 | Red clay separation process for alumina sintering production |
| CN2536572Y (en) * | 2002-03-26 | 2003-02-19 | 中国铝业股份有限公司 | Red mud separator for production of aluminum oxide by sintering process |
| CN1156399C (en) * | 2000-05-19 | 2004-07-07 | 郑州轻金属研究院 | Alumina producing process with hydraulic duralumin-type bauxite concentrate |
| CN1613771A (en) * | 2004-11-25 | 2005-05-11 | 中国铝业股份有限公司 | Method for separating red mud from alumina stripping slurry |
-
2005
- 2005-09-22 CN CNB2005102005585A patent/CN100396383C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6033579A (en) * | 1994-10-14 | 2000-03-07 | Andritz-Patentverwaltungs-Gesellschaft M.B.H | Red mud dewatering and washing process |
| CN1156399C (en) * | 2000-05-19 | 2004-07-07 | 郑州轻金属研究院 | Alumina producing process with hydraulic duralumin-type bauxite concentrate |
| CN1370741A (en) * | 2002-03-26 | 2002-09-25 | 贵州铝厂 | Red clay separation process for alumina sintering production |
| CN2536572Y (en) * | 2002-03-26 | 2003-02-19 | 中国铝业股份有限公司 | Red mud separator for production of aluminum oxide by sintering process |
| CN1613771A (en) * | 2004-11-25 | 2005-05-11 | 中国铝业股份有限公司 | Method for separating red mud from alumina stripping slurry |
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Owner name: GUIYANG ALUMINUM AND MAGNESIUM DESIGN INSTITUTE CO Free format text: FORMER NAME: GUIYANG ALUMINIUM AND MAGNESIUM DESIGN INST. |
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Address after: 550081 Guiyang Province, Jinyang New District, Zhu Zhu Road, No. 2 Patentee after: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. Address before: 550004 No. 208, Beijing Road, Guiyang, Guizhou Patentee before: Guiyang Aluminium and Magnesium Design Inst. |
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