Stripping method for diasporite type bauxite

A bauxite and bauxite technology, applied in the directions of alumina/aluminum hydroxide, process efficiency improvement, sustainable waste treatment, etc., can solve problems such as increased energy consumption in the production process, decreased ore utilization rate, and alkali loss. , to achieve the effect of easy operation, favorable comprehensive utilization and simple process

Active Publication Date: 2007-10-17
GUIZHOU BRANCH CHINA ALUMINUM IND
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AI Technical Summary

Problems solved by technology

If this part of the dissolved red mud is not recycled, it will cause a large loss of alkali and reduce the utilization rate of ore; if it is recycled, it

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] in lye N k Under the condition of 450g / L, calcium ferrite, lime and bauxite are added according to the solid content of 80g / L, and calcium ferrite and lime are added according to the generated iron hydration garnet 3CaO·Fe 2 o 3 · nSiO2 2 ·(6-2n)H 2 The coefficient in O is n=2.0, the reaction temperature is 90°C, and the reaction time is 12 hours. After the treatment, liquid-solid separation is carried out, and a certain amount of dissolution liquid is added to the solid, and the dissolution is carried out at a temperature of 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.

Embodiment 2

[0019] in lye N k Under the condition of 300g / L, calcium ferrite, lime and bauxite are added according to the solid content of 150g / L, and calcium ferrite and lime are added according to the generated iron hydration garnet 3CaO·Fe 2 o 3 · nSiO2 2 ·(6-2n)H 2 The coefficient in O is n=2.0, the reaction temperature is 100°C, and the reaction time is 8 hours. After the treatment, liquid-solid separation is carried out, and a certain amount of stripping liquid is added to the solid, and the stripping is carried out at a temperature of 260°C for 45 minutes. The aluminum-silicon ratio of the dissolved red mud is 0.67, and the sodium-silicon ratio is 0.21.

Embodiment 3

[0021] in lye N k Under the condition of 220g / L, calcium ferrite, lime and bauxite are added according to the solid content of 200g / L, and calcium ferrite and lime are added according to the generated iron hydration garnet 3CaO·Fe 2 o 3 · nSiO2 2 ·(6-2n)H 2 The coefficient in O is n=2.0, the reaction temperature is 120°C, and the reaction time is 4 hours. After the treatment, liquid-solid separation is carried out, and a certain amount of dissolution liquid is added to the solid, and the dissolution is carried out at a temperature of 260°C for 45 minutes. The aluminum-silicon ratio of the dissolved red mud is 0.68, and the sodium-silicon ratio is 0.19.

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Abstract

A releasing method of monohydrate hard bauxite ore belongs to alumina production technical field, especially a pretreatment of pulp additive calcium ferrite and calcareousness and regeneration method of pretreated lye. The releasing process comprises: pretreating the bauxite by lye, calcium ferrite 2CaO.Fe2O3, calcareousness CaO, then performing centrifugal separation, releasing the separated solid under the common Bayer process releasing condition; adding calcareousness in the used pretreated lye, removing the alumina in solution, regenerating the pretreated lye. The method can economically treat monohydrate hard bauxite ore containing silicon by Bayer process, improves the resource utilization factor and provides a technical support to the aluminium industry.

Description

technical field [0001] A method for leaching diaspore-type bauxite, the invention belongs to the technical field of alumina production, and relates to a method for leaching diaspore-type bauxite, in particular to adding calcium ferrite and lime to ore pulp The pretreatment process and the regeneration method of the pretreatment lye. technical background [0002] In the Bayer dissolution process of processing diaspore type bauxite, lime is usually added as a dissolution additive at 5% to 8% of the dry ore amount. The addition of lime can increase the dissolution rate of alumina and reduce alkali consumption. , but usually, the aluminum-silicon ratio A / S of the dissolved red mud is 1.3-2.0, and the sodium-silicon ratio N / S is about 0.5. If this part of the dissolved red mud is not recycled, it will cause a large loss of alkali and reduce the utilization rate of ore; if it is recycled, it needs to be processed by sintering method with high energy consumption, which will increa...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B3/20C01F7/02C04B18/14
CPCY02P10/20Y02W30/91
Inventor 李新华尹中林武国宝
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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