Method for treating white residue

A treatment method and technology for silicon slag, applied in the removal of solid waste, alumina/aluminum hydroxide, etc., can solve the problems of unreasonable economy, too harsh equipment material requirements, high alkali concentration, and achieve economical and reasonable recovery, equipment material Low demand, high recovery effect

Active Publication Date: 2009-09-23
中铝中州铝业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the concentration of alkali in the solution is high and the caustic ratio is high (α k 10 to 30), high temperature and high pressure are required, and the requirements for equipment materials are too strict; 2) The hydrothermal method proposed by Czech and Hungarian scholars is only under slightly looser conditions than the former (α k 4.0 or so) to recover the alkali in the red mud, but the alumina recovery rate is low, and the aluminum-silicon ratio of the treated red mud is still greater than 1, which is economically unreasonable

Method used

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  • Method for treating white residue
  • Method for treating white residue
  • Method for treating white residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Production process conditions:

[0021] 1. Silicon slag slurry

[0022] The moisture content of mixed silicon slag slurry is 46%

[0023] Silicon slag raw material [N] / [R]([N] / [R]=[Na 2 O] / [Fe 2 o 3 ]+[Al 2 o 3 ]) 1.0

[0024] Silicon slag raw material [C] / [S]([C] / [S]=[CaO] / [SiO 2 ]) 1.6

[0025] 2. Clinker sintering

[0026] Silicon slag clinker sintering temperature 1000°C

[0027] Sintering time 30~60s

[0028] 3. Dissolution of clinker

[0029] Dissolution temperature 85℃

[0030] Dissolution L / S 4-4.5

[0031] Dissolution time 30min

[0032] 2. Technical indicators:

[0033] Standard dissolution rate of silicon slag clinker: Al 2 o 3 95.25%

[0034] Na 2 O 96.6%

[0035] Net dissolution rate of silicon slag clinker: Al 2 o 3 89.48%

[0036] Na 2 O 95.19%

[0037] Red mud settlement index:

[0038]

Embodiment 2

[0040] 1. Production process conditions:

[0041] 1. Silicon slag slurry

[0042] The moisture content of mixed silicon slag slurry is 46%

[0043] Silicon slag raw meal [N] / [R] 0.92

[0044] Silicon slag raw meal [C] / [S] 1.7

[0045] 2. Clinker sintering

[0046] Silicon slag clinker sintering temperature 1050°C

[0047] Sintering time 30~60s

[0048] 3. Dissolution of clinker

[0049] Dissolution temperature 85℃

[0050] Dissolution L / S 4-4.5

[0051] Dissolution time 30min

[0052] 2. Technical indicators:

[0053] Standard dissolution rate of silicon slag clinker: Al 2 o 395.48%

[0054] Na 2 O 96.8%

[0055] Net dissolution rate of silicon slag clinker: Al 2 o 3 90.12%

[0056] Na 2 O 95.84%

[0057] Red mud settlement index:

[0058]

Embodiment 3

[0060] 1. Production process conditions:

[0061] 1. Silicon slag slurry

[0062] The moisture content of mixed silicon slag slurry is 46%

[0063] Silicon slag raw meal [N] / [R] 0.98

[0064] Silicon slag raw meal [C] / [S] 1.35

[0065] 2. Clinker sintering

[0066] Silicon slag clinker sintering temperature 1100℃

[0067] Sintering time 30~60s

[0068] 3. Dissolution of clinker

[0069] Dissolution temperature 85℃

[0070] Dissolution solid-liquid ratio L / S 4-4.5

[0071] Dissolution time 30min

[0072] 2. Technical indicators:

[0073] Standard dissolution rate of silicon slag clinker: Al 2 o 3 95.95%

[0074] Na 2 O 97.2%

[0075] Net dissolution rate of silicon slag clinker: Al 2 o 3 90.89%

[0076] Na 2 O 95.88%

[0077] Red mud settlement index:

[0078]

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PUM

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Abstract

The invention relates to a method for treating silicon slag, which relates to a method for treating silicon slag of a sintering method in a combined alumina production process, in particular to a method for extracting alumina and recovering alkali from the silicon slag of a sintering method. It is characterized in that after the silicon slag desiliconized by the sodium aluminate solution is mixed with the carbon mother liquor, after drying, sintering and cooling, the silicon slag clinker is sent to the dissolution tank, and the lye is stirred and dissolved in the dissolution tank After that, it is sent to the solid-liquid separation system. The method of the invention has low requirements on equipment materials, high alumina recovery rate, and economically and reasonably recovers alumina and alkali from silicon slag.

Description

technical field [0001] A treatment method for silicon slag relates to a treatment method for sintering method silicon slag in the process of combined alumina production. Background technique [0002] Alumina production methods can be roughly divided into four categories, namely alkaline method, acid method, acid-base combined method and thermal method. At present, all the methods used in industrial production belong to the alkali method, and the production of alumina by the alkali method is divided into various processes such as Bayer method, sintering method and Bayer-sintering combined method. [0003] my country's bauxite is mainly of diaspore type, mainly of medium grade, of which ores with an aluminum-silicon ratio (A / S) of 4 to 8 account for about 80% of the total. Therefore, the sintering method occupies a large proportion in my country's alumina production. The sintering alumina production process includes raw meal preparation, clinker firing, clinker dissolution, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B09B3/00
Inventor 娄东民刘祥民张吉龙刘伟王永红李太昌赵东锋廖新勤李国兵王二星张际强刘国红邢体义王涛孙建峰
Owner 中铝中州铝业有限公司
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