Stripping process for diaspore ore

A hydraulic and bauxite technology, which is applied in the dissolution field of diaspore ore, can solve the problems of decreased utilization rate of bauxite, loss of alumina and alkali, increased energy consumption, etc. less, the effect of reducing the amount of red mud

Inactive Publication Date: 2008-10-22
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the grade of high-iron bauxite is low, if the useful components of this part of red mud are not recovered, it will cause a large loss of alumina and alkali, and the utilization rate of bauxite will also be greatly reduced; if it is recovered, usually Need to adopt sintering method with high energy consumption, which will increase the energy consumption of the whole production process

Method used

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  • Stripping process for diaspore ore
  • Stripping process for diaspore ore
  • Stripping process for diaspore ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] in lye N k Under the conditions of 300g / L and alumina concentration of 5g / L, lime and high-iron bauxite (Fe 2 o 3 content is 18%), the amount of lime added is according to C / S (CaO and SiO 2 The mass ratio) is calculated as 2.0, the reaction temperature is 150° C., the reaction time is 2 hours, and liquid-solid separation is carried out after treatment. Add a certain amount of circulating mother liquor to the obtained solid, and dissolve it at 260°C for 45 minutes. The aluminum-silicon ratio of the dissolved red mud is 0.73, and the sodium-silicon ratio is 0.08. For the obtained liquid N k 280g / L, aluminum oxide concentration of 30g / L pretreated lye for liquid-liquid extraction, that is, use fatty alcohol as the extractant to extract sodium hydroxide from the liquid, and then use water as the stripping agent to obtain N k The lye with a concentration of 300g / L and an alumina concentration of 5.5g / L can be used to pretreat the next batch of bauxite. Raffinate causti...

Embodiment 2

[0025] in lye N k Under the conditions of 200g / L and alumina concentration of 3g / L, lime and high iron bauxite (Fe 2 o 3 Content is 16%), the amount of lime added is according to C / S (CaO and SiO 2 The mass ratio) is calculated as 2.5, the reaction temperature is 140°C, and the reaction time is 2 hours. After the treatment, the liquid-solid separation is carried out, and a certain amount of circulating mother liquor is added to the obtained solid, and the aluminum silicon of the red mud is dissolved at 260°C for 60 minutes. The ratio is 0.44 and the ratio of sodium to silicon is 0.04. For the obtained liquid N k 185g / L, aluminum oxide concentration of 20g / L pretreated lye for liquid-liquid extraction, that is, use alkylphenol as extractant to extract sodium hydroxide from the liquid, and then use water as stripping agent to obtain N kThe lye with a concentration of 200g / L and an alumina concentration of 3g / L can be used to pretreat the next batch of bauxite. Raffinate cau...

Embodiment 3

[0027] in lye N k Under the conditions of 400g / L and alumina concentration of 10g / L, lime and high-iron bauxite are added according to the solid content of 300g / L, and the amount of lime added is based on C / S (CaO and SiO 2 The mass ratio) is calculated as 3.0, the reaction temperature is 80°C, and the reaction time is 12 hours. After the treatment, the liquid-solid separation is carried out, and a certain amount of circulating mother liquor is added to the obtained solid, and the aluminum silicon of the red mud is dissolved at 280°C for 30 minutes. The ratio is 0.54, and the ratio of sodium to silicon is 0.03. For the obtained liquid N k 380g / L, aluminum oxide concentration of 60g / L pretreated lye for liquid-liquid extraction, that is, use fatty alcohol as an extractant to extract sodium hydroxide from the liquid, and then use water as a stripping agent to obtain N k The lye with a concentration of 400g / L and an alumina concentration of 10g / L can be used to pretreat the nex...

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Abstract

The invention provides a method for dissolving out a diaspore ore, which relates to a preprocessing process of adding lime into ore slurry in the process for dissolving out ferric-diaspore ore and a regeneration method of pre-processing alkali solution. The method is characterized in that during the dissolving-out process, ferric-bauxite ore is added with lime CaO and alkali solution for preprocessing and then carries out solid-liquid separation; the obtained solid is used for dissolving out under the conditions of normal Bayer process; the obtained liquid realizes the regeneration of the preprocessing alkali solution by a extraction method. The method of the invention only takes the lime as an additive and has simple procedures and obviously reduces the ratio of aluminum and silicon (A/S) and the ratio of natrium and silicon (N/S) in the dissolved-out red mud, which is applicable to processing a diaspore type bauxite with high content of ferric oxide (the content of Fe2O3 is higher than or is equal to 6 percent).

Description

technical field [0001] The invention relates to a diaspore ore stripping method, which relates to a pretreatment process of adding lime to ore pulp in the stripping process of high-iron diaspore ore and a regeneration method of pretreatment lye. Background technique [0002] In the process of alumina production, Fe in the ore 2 o 3 Content ≥ 6% is called high-iron bauxite. Due to the high iron content, the processing technology is difficult. When the Bayer method is used to treat high-iron diaspore ore, the aluminum-silicon ratio A / S of the dissolved red mud is generally 1.3-2.0, and the sodium-silicon ratio N / S is about 0.5. When the grade of high-iron bauxite is low, if the useful components of this part of red mud are not recovered, it will cause a large loss of alumina and alkali, and the utilization rate of bauxite will also be greatly reduced; if it is recovered, usually The sintering method with high energy consumption needs to be used to increase the energy consum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 顾松青李新华尹中林
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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