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Method for preparing sodium aluminate solution purifying filter aid and utilizing filter cake in alumina production

A filter aid, sodium aluminate technology, applied in the field of metallurgy, can solve the problems of reducing the service life of leaf filter cloth, increasing process load, reducing alumina content, etc., to avoid pollution and waste of resources, reduce alumina Loss, effect of reducing processing load

Active Publication Date: 2016-08-31
GUANGXI HUAYIN ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Confirm that there are following problems in this method by production and test: (1) lime has raw burning, overburning in firing process, causes the impurity such as a large amount of coarse sands to exist in lime milk slurry, easily blocks conveying pipeline, reduces leaf filter filter cloth service life, increase the consumption of filter cloth; (2) lime milk reacts with crude liquid or semen, reducing the alumina content in crude liquid or semen, resulting in loss of alumina and increasing production costs; (3) because it needs to use Semen flushing, this part of semen returns to the post-dissolution tank or separation and settling tank with the filter cake, which increases the processing load of the process; (4) because the leaf filter cake contains a certain amount of effective calcium oxide and alumina, the alumina in the filter cake , Alkali cannot be recycled, and at the same time, it will increase the loss of alumina and alkali in the system

Method used

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  • Method for preparing sodium aluminate solution purifying filter aid and utilizing filter cake in alumina production
  • Method for preparing sodium aluminate solution purifying filter aid and utilizing filter cake in alumina production
  • Method for preparing sodium aluminate solution purifying filter aid and utilizing filter cake in alumina production

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Embodiment 1

[0034] A method for preparing a sodium aluminate solution refined filter aid and utilizing a filter cake in alumina production, comprising the following specific steps:

[0035] (1) Impurity removal: pass lime milk through a rotary sieve to remove 1 mm of coarse sand impurities, and set aside;

[0036] (2) Preparation of calcium aluminate slurry: use milk of lime and decomposed mother liquor after removing impurities in step (1) (it is the solution remaining after the semen in the semen tank is extracted from aluminum hydroxide through the decomposition process, and the active ingredient is NaAl (OH) 4 ; at the beginning of the period, the raw material used in the market is enough sodium aluminate refined solution) to be put into the filter aid preparation tank according to the volume ratio of 1:2, and the temperature is 90 ° C, stirred for 1 hour, and the reaction is prepared to obtain calcium aluminate slurry, which is the aid Filter, the effective active ingredient is 3CaO...

Embodiment 2

[0041] A method for preparing a sodium aluminate solution refined filter aid and utilizing a filter cake in alumina production, comprising the following specific steps:

[0042] (1) Impurity removal: pass the lime through a rotary sieve or a fixed grid sieve to remove 1.5 mm of coarse sand impurities, and set aside;

[0043] (2) Preparation of calcium aluminate slurry: use lime after removing impurities in step (1) and decompose mother liquor (be that the semen in the semen tank passes through the solution that remains after the decomposition process extracts aluminum hydroxide, and the active ingredient is NaAl ( Oh) 4 ; At the beginning of the period, the raw material used was enough sodium aluminate refined solution on the market) to be put into the filter aid preparation tank according to the volume ratio of 1:3, and the temperature was 97°C, stirred for 2 hours, and the reaction was prepared to obtain calcium aluminate slurry, which was the filter aid preparation tank. F...

Embodiment 3

[0049] A method for preparing a sodium aluminate solution refined filter aid and utilizing a filter cake in alumina production, comprising the following specific steps:

[0050] (1) Impurity removal: pass lime milk and lime through a rotary sieve or a fixed grid sieve to remove coarse sand impurities above 1 mm, and set aside;

[0051] (2) Preparation of calcium aluminate slurry: milk of lime and lime mixture after removing impurities in step (1) and decomposed mother liquor (the semen in the semen tank is the solution remaining after the aluminum hydroxide is extracted through the decomposition process, effectively The composition is NaAl(OH) 4 ; At the beginning of the period, the raw materials used in the market were enough sodium aluminate refined solution) to be put into the filter aid preparation tank according to the volume ratio of 1:4. Filter, the effective active ingredient is 3CaO·Al 2 o 3 ·6H 2 O, CaO / Al in calcium aluminate slurry 2 o 3 molar ratio 2;

[00...

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Abstract

The invention discloses a method for preparing a sodium aluminate solution purifying filter aid and utilizing a filter cake in alumina production. The method comprises the following steps: 1, preparing the filter aid: adding lime milk and / or lime and a decomposition mother liquor to a filter aid preparation tank, and carrying out a reaction to obtain a calcium aluminate slurry which is the filter aid, wherein the decomposition mother liquor is a solution residual after aluminum hydroxide extraction through a decomposition process of a purified liquid in a purified liquid tank; and 2, utilizing the filter cake: filtering the filter cake through a leaf filter, centrifuging and filtering the filter cake slurry, and desiliconizing a filter cake B in order to realize repeated utilization of the filter cake. The method for preparing the sodium aluminate purifying filter aid, removing grits and other impurities and reutilizing the filter cake in the alumina refinery sodium aluminate solution purifying filter aid production has the advantages of effective improvement of the productivity of the leaf filer, prolongation of the service life of a filter cloth, increase of the alumina recovery rate, effective utilization of calcium oxide and sodium oxide in the filter cake, and high economy values.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for preparing a sodium aluminate solution refined filter aid and a filter cake utilization method in alumina production. Background technique [0002] The refining process of sodium aluminate solution in alumina production is to add lime milk, sodium aluminate solution and lime milk react to form a filter aid-calcium aluminate substance, and form a loose and porous filter skeleton on the surface of the filter cloth of the leaf filter , reduce the coarse liquid filtration resistance, so that the red mud slurry adsorbed on the filter cloth of the leaf filter is easy to fall off from the filter cloth, and it is easy to unload the mud. Current process: (1) The preparation of filter aid-calcium aluminate is produced by the reaction of milk of lime and crude liquid or semen; (2) Leaf filter cake slurry is returned to the post-dissolution tank or the separation and settlin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16C01F7/02C01D1/02
CPCC01D1/02C01F7/02C01F7/164
Inventor 张观玉张敏吴俊池罗付洪覃伟祥韦振权周开雄陈嘉豪黄建华罗怀征
Owner GUANGXI HUAYIN ALUMINUM
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