Silicon recovery method

A technology of silicon raw material and sodium silicate is applied in the field of solid waste resource utilization to achieve the effects of expanding application channels, high recovery rate and less residue.

Active Publication Date: 2012-06-27
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] From the above patents, it can be seen that the extraction of silicon to produce water glass is mainly based on the alkali solution wet method of silicon extraction, and the dry method involved in silicon extraction is similar to the sintering method of alumina production Technology, there is essential difference with the present invention, adopts acid leaching slag dry method to produce water glass and does not see public report

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Embodiment 1

[0027] Embodiment 1: the method for this recovery silicon, concrete operation is as follows:

[0028] Using fly ash as raw material, take 200g of fly ash and put it into a 1000ml three-neck flask, add 600g of sulfuric acid solution with a mass percentage concentration of 65%, that is, the liquid-solid ratio is 3:1, react at 115°C for 4h, filter, water Wash until the pH is 3 to obtain 137g of acid leaching residue. After analysis, the SiO in the acid leaching residue 2 、Al 2 o 3 , TFe, Ca0, MgO, SO 3 The contents are 85.55%, 3.22%, 1.35%, 3.45%, 0.10%, 5.45%, respectively.

[0029] Take 50g of the above acid leaching residue, use high-sulfur coal as a reducing agent (the fixed carbon content of high-sulfur coal is 72%, and the elemental sulfur content is 4.32%) to prepare sodium silicate with a modulus of 1.0. According to the overall reaction equation, anhydrous The amount of sodium sulfate and high-sulfur coal added is 95g and 5.7g respectively. After the raw materials a...

Embodiment 2

[0030] Embodiment 2: the method for this recovery silicon, concrete operation is as follows:

[0031] Coal gangue is used as raw material. Coal gangue is thermally activated at 750°C for 2 hours, and ground until the particle size is less than 5% after passing through an 80-mesh sieve. Take 200g of activated coal gangue and put it into a 1000ml three-necked flask, and add a mass percentage concentration of 60 % sulfuric acid solution 800g, that is, the liquid-solid ratio is 4:1, react at 110°C for 3h, filter, wash with water until the pH is 4, and obtain 125g of acid leaching residue. After analysis, the SiO in the acid leaching residue 2 、Al 2o 3 , TFe, Ca0, MgO, SO 3 The contents are 91.37%, 1.30%, 0.33%, 2.85%, 0.01%, 3.97%, respectively.

[0032] Take 50g of the above acid leaching residue, use high-sulfur coal as a reducing agent (the fixed carbon content of high-sulfur coal is 72%, and the elemental sulfur content is 4.32%) to prepare sodium silicate with a modulus o...

Embodiment 3

[0033] Embodiment 3: the method for this recovery silicon, concrete operation is as follows:

[0034] Use bauxite beneficiation tailings as raw material, heat-activate the tailings at 800°C for 1.5 hours, grind until the particle size is less than 5% after passing through an 80-mesh sieve, take 200g of activated tailings and put them into a 1000ml three-neck flask, add mass The percentage concentration is 700g of 30% hydrochloric acid solution, that is, the liquid-solid ratio is 3.5:1, react at 95°C for 3.5h, filter, wash with water until the pH is 3.5, and obtain 122g of acid leaching residue. After analysis, the SiO in the acid leaching residue 2 、Al 2 o 3 , TFe, Ca0, MgO, SO 3 The contents are 93.20%, 1.22%, 0.21%, 2.02%, 0.03%, 3.17%, respectively.

[0035] Take 50g of the above-mentioned acid leaching residue, and use ordinary coal as raw material (fixed carbon content is 83.6) to prepare sodium silicate with a modulus of 3.5. According to the overall reaction equatio...

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Abstract

The invention discloses a silicon recovery method, which comprises: taking an industrial waste as a raw material, using an acid solution for acid leaching, filtering, and washing, then adding anhydrous sodium sulfate into an acid leaching residue, employing carbon as a reducing agent, and conducting high temperature fusion reaction so as to obtain sodium silicate, which is then subjected to thermal dissolution or high temperature water dissolution, thus obtaining water glass. The method of the invention has the characteristics of high silicon recovery rate, fewer residue, reasonable resource utilization, and adjustable water glass modulus ranging from 1 to 3.5, provides a new for industrial waste acid leaching slag silicon provides a new technological route for silicon extraction from the acid leaching residue of an industrial waste, and is conducive to resource comprehensive application of industrial wastes.

Description

technical field [0001] The invention relates to a method for recovering silicon, which belongs to the technical field of resource utilization of solid waste. Background technique [0002] Water glass, commonly known as sodium silicate, is a water-soluble silicate. Its chemical formula is R 2 O n SiO 2 , where R 2 O is an alkali metal oxide, and n is the ratio of silicon dioxide to the number of moles of alkali metal oxide, which is called the modulus of water glass. [0003] The use of water glass is very extensive, almost throughout all sectors of the national economy. In the chemical system, it is used to manufacture various silicate products such as silica gel, white carbon black, zeolite molecular sieve, sodium metasilicate pentahydrate, silica sol, layer silicon and instant powdered sodium silicate, potassium sodium silicate, etc. Basic raw material for silicon compounds. In economically developed countries, more than 50 kinds of deep-processing products using sod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32
Inventor 夏举佩张召述陶军钟晨
Owner KUNMING UNIV OF SCI & TECH
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