WO2007009374A1 - Technique for conveying and filtering red mud - Google Patents

Technique for conveying and filtering red mud Download PDF

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Publication number
WO2007009374A1
WO2007009374A1 PCT/CN2006/001740 CN2006001740W WO2007009374A1 WO 2007009374 A1 WO2007009374 A1 WO 2007009374A1 CN 2006001740 W CN2006001740 W CN 2006001740W WO 2007009374 A1 WO2007009374 A1 WO 2007009374A1
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Prior art keywords
red mud
conveying
yard
sedimentation
slurry
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PCT/CN2006/001740
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French (fr)
Chinese (zh)
Inventor
De Chen
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China Aluminum International Engineering Corporation Limited
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Publication of WO2007009374A1 publication Critical patent/WO2007009374A1/en

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    • 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
    • C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
    • C01F7/066—Treatment of the separated residue
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering

Definitions

  • the present invention relates to an alumina production process, and more particularly to a red mud transfer and filtration process for an alumina plant. Background technique:
  • Red mud wet transport, wet storage scheme This is the most widely used scheme in alumina plants. After the red mud is washed by the sedimentation tank, it is sent to the red mud filtration process and then washed and filtered by the cylinder filter, and then sent to the red mud slurry tank to adjust the red mud liquid-solid ratio L/S index to about 3 ⁇ 4. It is transported to the red mud yard by centrifugal pump and pipeline. It is characterized by high solid-liquid ratio L/S and low conveying resistance. It can be transported by multiple cascade centrifugal pumps. Because centrifugal pumps are standardized ordinary mechanical equipment, Therefore, the investment is lower.
  • Red mud thousand law transport, dry storage plan ' This program is a more advanced red mud transport storage program used by China's alumina plant in the past ten years.
  • the red mud is washed by the sedimentation tank, it is sent to the red mud filtration process and then washed and filtered by a cylindrical filter. Then, it is sent to the red mud reaction tank to reduce the viscosity by stirring shearing, increase the fluidity, and red in the reaction tank.
  • the mud-solid ratio L/S is adjusted to the range of 0.85 to 1. 0, and is sent to the red mud yard by a high-pressure diaphragm pump and a pipe.
  • red mud has a small water content and a small volume
  • the occupied red mud yard has a small volume, which makes the utilization rate of the red mud yard high.
  • Third, the red mud can be used to build a red mud dam after cooling and drying, saving construction materials. Therefore, the operating cost of the red mud yard is low.
  • the shortcoming of this scheme is that the red mud slurry has a higher viscosity than the L/S, the red mud has a higher viscosity, and the pipeline has a large resistance during the transportation.
  • the production pressure of the red mud pump is usually required to be 12. 0 ⁇ 16.
  • OMPa ordinary centrifugal pump can not meet the requirements, must use imported high-pressure diaphragm pump, the price of this pump is up to 5 million yuan / Taiwan.
  • a 400kt / a scale alumina plant is equipped with two such pumps, and the investment in purchasing the pump will cost more than 10 million yuan.
  • Automotive transport, dry storage solutions This solution is typically used in small alumina plants. Due to the small amount of red mud in the small alumina plant, the red mud transfer can be used by the external cooperation unit, thus reducing the one-time investment cost of the construction project.
  • this method of transportation has many shortcomings: First, high labor intensity, low degree of automation, and both loading and unloading are troublesome. Second, the operating costs are high. In addition to handling and transportation costs, road costs are also higher. Third, if the car is not transported in time, it may have an adverse effect on production.
  • the object of the present invention is to propose a new red mud conveying and filtering process, comprehensively utilizing the advantages of red mud wet transportation and dry storage, so as to achieve high utilization rate of investment province and red mud yard and environmental protection.
  • the red mud adopts the method of wet conveying and dry storage, that is, the red mud slurry which is discharged from the bottom of the sedimentation tank at the end of the sedimentation workshop, and is sent to the red mud yard by the cascade centrifugal pump and the pipeline. After proper dilution in the red mud slurry tank, it is pumped into the red mud filter press for pressure filtration. The red mud washing water obtained by pressure filtration is returned to the alumina plant sedimentation process for red mud sedimentation washing and pressure filtration. The obtained filter cake is transported by car to various discharge points of the red mud yard.
  • the red mud slurry discharged from the bottom of the sedimentation tank at the bottom of the sedimentation tank is controlled to be 1. 5 ⁇ 2. 5, the hot mud is added to the red mud slurry tank to dilute the red mud, and the red mud is pressure-filtered. The water after filtration is less than 30%.
  • the main contents of the present invention are as follows:
  • the red mud is transported by wet method, but the red mud liquid-to-solid ratio is controlled at 1. 5 ⁇ 2. 5, flowing out from the bottom of the existing last washing settling tank, and directly sent to the red mud yard without the red mud filtration process. .
  • the bottom stream of the last washing tank in the alumina plant can achieve a liquid-solid L/S ratio of 1. 5 ⁇ 2. 5 .
  • this concentration of slurry is well transported by a centrifugal pump.
  • the use of a centrifugal pump to replace the high pressure diaphragm pump can greatly reduce its investment.
  • a red mud slurry tank is installed at the red mud yard to buffer storage and ensure that the filter supply is stable.
  • the red mud filtration will be moved from the alumina plant to the red mud yard, and the imported filter will be replaced by a filter press. There will be no major changes in investment. However, the filter cake obtained from the filter press has a lower moisture content, usually below 30%. However, the moisture content of the red mud slurry which is transported by the existing alumina plant to the red mud yard is 46 - 48%, so the red mud moisture of the scheme is lower, and the utilization rate of the red mud yard is red mud. The yard is anti-seepage and is more beneficial to environmental protection.
  • red mud yard Since the red mud yard usually occupies a large area, in order to facilitate the storage, the red mud is transported by car to various stacking points after pressure filtration. These vehicles only operate within the scope of the red mud yard, and the transportation distance is short, mainly for the purpose of reversing operations. There is no problem of increasing road traffic and paying tolls.
  • FIG. 1 is a schematic flow chart of the present invention. detailed description:
  • Embodiment 1 of the present invention is a diagrammatic representation of Embodiment 1 of the present invention.
  • the liquid-solid ratio of the red mud slurry from the bottom of the sedimentation tank at the bottom of the sedimentation tank is controlled at 1.5 to 2.5, and is sent to the red mud slurry tank of the red mud yard by a cascade centrifugal pump and a pipe. After adding some hot water for dilution, it is pumped into the red mud filter press for pressure filtration, and the red mud washing water obtained after the pressure filtration is returned to the alumina plant sedimentation process for red mud sedimentation washing, and the obtained filter cake is obtained.
  • the water content is less than 30%, and it is transported by car to the discharge points of the red mud yard.
  • Embodiment 2 of the present invention is a diagrammatic representation of Embodiment 2 of the present invention.
  • the red mud slurry from the bottom of the sedimentation workshop at the end of the sedimentation tank if the red mud slurry If the temperature is low, the viscosity will increase and the filtration performance will be affected.
  • a steam pipe can be added to the red mud slurry tank to heat and control the red mud slurry and control it at 80 ⁇ 90 °C to ensure good red mud slurry. Filter performance. Others are the same as in the first embodiment.

Abstract

The invention discloses a novel red mud conveying and filtering process in aluminum oxide production, which consists of loading the red mud slurry from the final level washing and settling bath in sedimentation workshop into a red mud slurry tank through cascade centrifugal pumps and pipes, charging a portion of hot-water, pumping into a red mud pressing filter for press filtration, transferring the obtained dust cakes to various discharging spots of red mud storage through automobiles, storing the red mud with dry method, returning the washed red mud cleaning solution after press filtration to sedimentation workshop of alumina plants for washing.

Description

赤泥输送及过滤新工艺 技术领域：  Red mud conveying and filtration new technology
本发明涉及一种氧化铝生产工艺， 特别是涉及一种氧化铝厂 的赤泥输送及过滤工艺。 背景技术：  The present invention relates to an alumina production process, and more particularly to a red mud transfer and filtration process for an alumina plant. Background technique:
目前氧化铝厂赤泥输送、 堆存的方案主要有三种， 并各有优 缺点， 其现状分析如下：  At present, there are three main schemes for red mud transportation and storage in alumina plants, each with its own advantages and disadvantages. The current status analysis is as follows:
赤泥湿法输送、 湿法堆存方案： 这是目前氧化铝厂使用最多 的方案。 赤泥经沉降槽洗涤后， 送到赤泥过滤工序用圆筒过滤机 再进行洗涤过滤， 然后送进赤泥料浆槽， 将赤泥液固比 L/S指标 调整到 3 ~ 4左右， 再用离心泵及管道输送到赤泥堆场， 它的特点 是赤泥液固比 L/S高、 输送阻力小、 可采用多台串级离心泵输送， 由于离心泵属标准化普通机械设备， 故投资较低。 此方案的缺点 是赤泥中水含量高、 赤泥料浆体积大， 占用的赤泥堆场容积大， 赤泥堆场中水占用了相当大的体积， 使堆场利用率较低， 赤泥堆 场的投资较大； 另外， 这样的赤泥堆场防渗处理较难， 对环境保 护不利。  Red mud wet transport, wet storage scheme: This is the most widely used scheme in alumina plants. After the red mud is washed by the sedimentation tank, it is sent to the red mud filtration process and then washed and filtered by the cylinder filter, and then sent to the red mud slurry tank to adjust the red mud liquid-solid ratio L/S index to about 3~4. It is transported to the red mud yard by centrifugal pump and pipeline. It is characterized by high solid-liquid ratio L/S and low conveying resistance. It can be transported by multiple cascade centrifugal pumps. Because centrifugal pumps are standardized ordinary mechanical equipment, Therefore, the investment is lower. The shortcomings of this scheme are high water content in red mud, large volume of red mud slurry, large volume occupied by red mud yard, and considerable water volume in red mud yard, which makes the utilization rate of the yard low. The investment in the mud yard is relatively large; in addition, the anti-seepage treatment of such a red mud yard is difficult and unfavorable to environmental protection.
赤泥千法输送、 干法堆存方案'. 此方案是我国氧化铝厂近十 年来使用的较先进的赤泥输送堆存方案。 赤泥经沉降槽洗涤后， 送到赤泥过滤工序用圆筒过滤机再进行洗涤过滤， 然后送赤泥反 应槽通过搅拌剪切降低粘度， 增大其流动性， 并在反应槽中将赤 泥浆液固比 L/S调整到 0. 85 ~ 1. 0范围， 用高压隔膜泵及管道送到 赤泥堆场。 赤泥采用干法堆存有许多优点： 第一， 赤泥中水含量 小， 体积小， 占据的赤泥堆场容积小， 使赤泥堆场的利用率高。 第二， 赤泥堆场中几乎不含水， 对赤泥堆场防渗和环境保护非常 有利。 第三， 赤泥凉干后可用于筑赤泥坝， 节约建筑材料， 故赤 泥堆场的运行费用较低。 第四， 由于赤泥堆场内基本不积水， 故 赤泥坝体受到的内压力小， 有利于赤泥体向空中发展， 占地也减 少。 此方案的缺点是赤泥浆液固比 L/S减小后， 赤泥浆的粘度较 大，输送时管道阻力大，生产中通常要求赤泥泵输送压力在 12. 0 ~ 16. OMPa , 普通离心泵不能满足要求， 必须采用进口的高压隔膜 泵， 此泵价格高达 500万元 /台以上。 一个 400kt /a规模的氧化铝厂 配套两台这样的泵， 购买泵的投资就需 1000多万元。 Red mud thousand law transport, dry storage plan '. This program is a more advanced red mud transport storage program used by China's alumina plant in the past ten years. After the red mud is washed by the sedimentation tank, it is sent to the red mud filtration process and then washed and filtered by a cylindrical filter. Then, it is sent to the red mud reaction tank to reduce the viscosity by stirring shearing, increase the fluidity, and red in the reaction tank. The mud-solid ratio L/S is adjusted to the range of 0.85 to 1. 0, and is sent to the red mud yard by a high-pressure diaphragm pump and a pipe. The use of dry storage for red mud has many advantages: First, the red mud has a small water content and a small volume, and the occupied red mud yard has a small volume, which makes the utilization rate of the red mud yard high. Second, there is almost no water in the red mud yard, which is very beneficial to the anti-seepage and environmental protection of the red mud yard. Third, the red mud can be used to build a red mud dam after cooling and drying, saving construction materials. Therefore, the operating cost of the red mud yard is low. Fourthly, since there is basically no water accumulation in the red mud dump, the internal pressure of the red mud dam is small, which is conducive to the development of the red mud body into the air and the land occupation is also reduced. The shortcoming of this scheme is that the red mud slurry has a higher viscosity than the L/S, the red mud has a higher viscosity, and the pipeline has a large resistance during the transportation. The production pressure of the red mud pump is usually required to be 12. 0 ~ 16. OMPa, ordinary centrifugal pump can not meet the requirements, must use imported high-pressure diaphragm pump, the price of this pump is up to 5 million yuan / Taiwan. A 400kt / a scale alumina plant is equipped with two such pumps, and the investment in purchasing the pump will cost more than 10 million yuan.
汽车输送、 干法堆存方案： 此方案通常用于小氧化铝厂。 小 氧化铝厂由于赤泥量不大， 赤泥输送可以外委协作单位， 从而降 低建造工程的一次性投资费用。 但对于大型氧化铝厂来说， 这种 输送方法就存在很多缺点： 第一， 劳动强度高、 自动化程度低， 装车和卸车均较麻烦。 第二， 运行费用高， 除装卸费、 运输费外， 公路费用也较高。 第三， 若汽车运输不及时， 可能对生产造成不 利影响。  Automotive transport, dry storage solutions: This solution is typically used in small alumina plants. Due to the small amount of red mud in the small alumina plant, the red mud transfer can be used by the external cooperation unit, thus reducing the one-time investment cost of the construction project. However, for large alumina plants, this method of transportation has many shortcomings: First, high labor intensity, low degree of automation, and both loading and unloading are troublesome. Second, the operating costs are high. In addition to handling and transportation costs, road costs are also higher. Third, if the car is not transported in time, it may have an adverse effect on production.
对以上三种赤泥输送、 堆存方案进行详细研究后， 本发明针 对目前方案的不足， 提出一种新的赤泥输送、 堆存方案。 发明内容：  After a detailed study of the above three red mud transport and stockpiling schemes, the present invention proposes a new red mud transport and stockpiling scheme for the shortcomings of the current scheme. Summary of the invention:
本发明的目的在于： 提出一种赤泥输送及过滤新工艺， 综合 利用赤泥湿法输送、 干法堆存的优点， 做到投资省、 赤泥堆场利 用率高、 有利于环境保护， 以解决现有技术存在的问题。  The object of the present invention is to propose a new red mud conveying and filtering process, comprehensively utilizing the advantages of red mud wet transportation and dry storage, so as to achieve high utilization rate of investment province and red mud yard and environmental protection. To solve the problems existing in the prior art.
本发明是这样实现的： 赤泥采用湿法输送、 干法堆存的方式， 即从沉降车间末次洗涤沉降槽底流来的赤泥料浆， 用串级离心泵 及管道送往赤泥堆场的赤泥料浆槽中进行适当的稀释后， 再用泵 送进赤泥压滤机中进行压滤， 压滤得到的赤泥洗水返回氧化铝厂 沉降工序进行赤泥沉降洗涤， 压滤得到的滤饼用汽车倒运到赤泥 堆场各排放点。  The invention is realized as follows: The red mud adopts the method of wet conveying and dry storage, that is, the red mud slurry which is discharged from the bottom of the sedimentation tank at the end of the sedimentation workshop, and is sent to the red mud yard by the cascade centrifugal pump and the pipeline. After proper dilution in the red mud slurry tank, it is pumped into the red mud filter press for pressure filtration. The red mud washing water obtained by pressure filtration is returned to the alumina plant sedimentation process for red mud sedimentation washing and pressure filtration. The obtained filter cake is transported by car to various discharge points of the red mud yard.
从沉降车间末次洗涤沉降槽底流出来的赤泥料浆， 其液固比 控制在 1. 5 ~ 2. 5， 在赤泥料浆槽中加入热水对赤泥进行稀释， 赤 泥采用压滤机过滤后的水分低于 30%。  The red mud slurry discharged from the bottom of the sedimentation tank at the bottom of the sedimentation tank is controlled to be 1. 5 ~ 2. 5, the hot mud is added to the red mud slurry tank to dilute the red mud, and the red mud is pressure-filtered. The water after filtration is less than 30%.
本发明的主要内容如下：  The main contents of the present invention are as follows:
( 1 ) 、 赤泥采用湿法输送， 但赤泥液固比控制在 1. 5 ~ 2. 5， 从现有末次洗涤沉降槽底流出来， 不经赤泥过滤工序， 直接送赤 泥堆场。  (1) The red mud is transported by wet method, but the red mud liquid-to-solid ratio is controlled at 1. 5 ~ 2. 5, flowing out from the bottom of the existing last washing settling tank, and directly sent to the red mud yard without the red mud filtration process. .
( 2 ) 、 将氧化铝厂的赤泥过滤工序建在赤泥堆场旁边， 堆场 设置数台赤泥料浆槽， 沉降车间送来的赤泥浆进入赤泥料浆槽 中。 (2) The red mud filtration process of the alumina plant is built next to the red mud storage yard. Several red mud slurry tanks are installed in the storage yard, and the red mud slurry sent from the sedimentation workshop enters the red mud slurry tank. Medium.
( 3 ) 、 赤泥过滤采用压滤机， 使赤泥过滤后水分低于 30%。 (3), red mud filtration using a filter press, so that the red mud filtered water below 30%.
( 4 ) 、 压滤后赤用汽车倒运到堆场里。 (4) After the filter press, the red car is transported to the yard.
目前， 氧化铝厂末次洗涤沉降槽的底流， 无论采用平底沉降 槽还是深锥高效沉降槽， 其底流液固 L/S比均能达到 1. 5 ~ 2. 5。 根 据氧化铝生产经验， 此浓度的料浆用离心泵是很好输送的， 用离 心泵取代高压隔膜泵， 其投资可大幅度降低。 在赤泥堆场设置赤 泥料浆槽， 目的是起緩冲储存作用， 确保过滤机供料稳定。  At present, the bottom stream of the last washing tank in the alumina plant, whether using a flat bottom settling tank or a deep cone high-efficiency settling tank, can achieve a liquid-solid L/S ratio of 1. 5 ~ 2. 5 . According to the experience of alumina production, this concentration of slurry is well transported by a centrifugal pump. The use of a centrifugal pump to replace the high pressure diaphragm pump can greatly reduce its investment. A red mud slurry tank is installed at the red mud yard to buffer storage and ensure that the filter supply is stable.
将赤泥过滤从氧化铝厂内搬到赤泥堆场， 用压滤机取代进口 的圆筒过滤机， 投资不会有大的变动。 但压滤机得到的滤饼含水 率更低， 通常在 30%以下。 而现有氧化铝厂干法输送到赤泥堆场 的赤泥料浆中的水分含量为 46 - 48% , 故本方案赤泥水分更低， 这对赤泥堆场的利用率、 赤泥堆场防渗、 对环境保护更有利。  The red mud filtration will be moved from the alumina plant to the red mud yard, and the imported filter will be replaced by a filter press. There will be no major changes in investment. However, the filter cake obtained from the filter press has a lower moisture content, usually below 30%. However, the moisture content of the red mud slurry which is transported by the existing alumina plant to the red mud yard is 46 - 48%, so the red mud moisture of the scheme is lower, and the utilization rate of the red mud yard is red mud. The yard is anti-seepage and is more beneficial to environmental protection.
由于赤泥堆场通常占地大， 为便于堆存， 压滤后赤泥用汽车 运往各堆放点。 这些汽车只在赤泥堆场范围内作业， 运输距离短， 主要是倒运任务， 不存在增大公路运输量和交过路费问题。  Since the red mud yard usually occupies a large area, in order to facilitate the storage, the red mud is transported by car to various stacking points after pressure filtration. These vehicles only operate within the scope of the red mud yard, and the transportation distance is short, mainly for the purpose of reversing operations. There is no problem of increasing road traffic and paying tolls.
本发明的有益效果是： 综合利用赤泥湿法输送、 干法堆存的 优点， 投资省、 赤泥堆场利用率高、 有利于环境保护。 附图说明：  The beneficial effects of the invention are as follows: comprehensively utilizing the advantages of red mud wet transport and dry storage, the investment province and the red mud yard have high utilization rate and are beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS:
图 1本发明的流程示意图。 具体实施方式：  Figure 1 is a schematic flow chart of the present invention. detailed description:
本发明的实施例 1 :  Embodiment 1 of the present invention:
从沉降车间末次洗涤沉降槽底流来的赤泥料浆， 其液固比控 制在 1. 5 ~ 2. 5， 用串级离心泵及管道送往赤泥堆场的赤泥料浆槽 中， 在此加入部分热水进行稀释后， 再用泵送进赤泥压滤机中进 行压滤， 压滤后得到的赤泥洗水返回氧化铝厂沉降工序进行赤泥 沉降洗涤， 得到的滤饼水分低于 30%， 用汽车倒运到赤泥堆场各 排放点。  The liquid-solid ratio of the red mud slurry from the bottom of the sedimentation tank at the bottom of the sedimentation tank is controlled at 1.5 to 2.5, and is sent to the red mud slurry tank of the red mud yard by a cascade centrifugal pump and a pipe. After adding some hot water for dilution, it is pumped into the red mud filter press for pressure filtration, and the red mud washing water obtained after the pressure filtration is returned to the alumina plant sedimentation process for red mud sedimentation washing, and the obtained filter cake is obtained. The water content is less than 30%, and it is transported by car to the discharge points of the red mud yard.
本发明的实施例 2 :  Embodiment 2 of the present invention:
从沉降车间末次洗涤沉降槽底流来的赤泥料浆， 若赤泥料浆 温度偏低， 会造成粘度增大而影响过滤性能， 可在赤泥料浆槽中 增设蒸汽管， 对赤泥料浆进行加热提温并控制在 80~ 90°C， 确保 赤泥料浆良好的过滤性能。 其他则与实施例 1相同。 The red mud slurry from the bottom of the sedimentation workshop at the end of the sedimentation tank, if the red mud slurry If the temperature is low, the viscosity will increase and the filtration performance will be affected. A steam pipe can be added to the red mud slurry tank to heat and control the red mud slurry and control it at 80~90 °C to ensure good red mud slurry. Filter performance. Others are the same as in the first embodiment.

Claims

权 利 要 求 Rights request
1. 一种赤泥输送及过滤新工艺， 其特征是： 赤泥采用湿法输 送、 干法堆存的方式， 即从沉降车间末次洗涤沉降槽底流来的赤 泥料浆， 用串级离心泵及管道送往赤泥堆场的赤泥料浆槽中进行 适当的稀释后， 再用泵送进赤泥压滤机中压滤， 压滤得到的赤泥 洗水返回氧化铝厂沉降工序进行赤泥沉降洗涤， 压滤得到的滤饼 运到赤泥堆场各排放点。 A red mud conveying and filtering new process, characterized in that: the red mud adopts a wet conveying method and a dry method, that is, a red mud slurry which is discharged from the bottom of the sedimentation tank at the bottom of the sedimentation tank, and is cascaded by a cascade. The pump and pipeline are sent to the red mud slurry tank of the red mud yard for proper dilution, and then pumped into the red mud filter press for pressure filtration. The red mud washing water obtained by pressure filtration is returned to the alumina plant. The red mud sedimentation washing is carried out, and the filter cake obtained by pressure filtration is transported to various discharge points of the red mud yard.
2. 根据权利要求 1所述的赤泥输送及过滤新工艺， 其特征是： 从沉降车间末次洗涤沉降槽底流出来的赤泥料浆， 其液固比控制 在 1· 5 ~ 2· 5。  2. The red mud conveying and filtering process according to claim 1, wherein: the liquid-solid ratio of the red mud slurry flowing out from the bottom of the sedimentation tank at the end of the sedimentation workshop is controlled at 1.5·2.5.
3. 根据权利要求 1所述的赤泥输送及过滤新工艺， 其特征是： 在赤泥料浆槽中加入热水对赤泥进行稀释。  3. The red mud conveying and filtering process according to claim 1, wherein: the red mud is diluted by adding hot water to the red mud slurry tank.
4. 根据权利要求 1所述的赤泥输送及过滤新工艺， 其特征是： 赤泥采用压滤机过滤后的水分低于 30%。  4. The red mud conveying and filtering process according to claim 1, wherein: the red mud is filtered by a filter press to have a moisture content of less than 30%.
PCT/CN2006/001740 2005-07-18 2006-07-18 Technique for conveying and filtering red mud WO2007009374A1 (en)

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CN105565349A (en) * 2016-01-19 2016-05-11 中国铝业股份有限公司 Recycling method for leaf filter residues in aluminum oxide production
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