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Preparation method of high-purity water glass, low-iron white carbon black and ultra-white glass raw materials

A high-purity water and glass technology, applied in the directions of silicon dioxide, silicate, silicon oxide, etc., can solve the problems such as the inability to meet the requirements of ultra-white glass raw materials, the inability to meet the requirements of ultra-white glass containing iron, and the low iron removal efficiency.

Active Publication Date: 2021-05-11
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In order to obtain low-iron raw materials, iron can be removed by pickling, but the cost is high and the efficiency of iron removal is low, which cannot meet the iron content requirements of ultra-clear glass
Silica can be prepared by controlling the pH to divide carbon into water glass step by step, but the national standard for silica products stipulates that the content of iron oxide is less than 1000ppm or 500ppm, which also cannot meet the requirements of ultra-white glass raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0010] One aspect of the present invention provides a method for preparing high-purity water glass, wherein the preparation method includes: (1) contacting the fly ash and / or the aluminum extraction residue from the fly ash with an alkali solution to carry out alkali-dissolution desiliconization; The solid-liquid mixed slurry obtained after the alkali-solution desiliconization treatment is contacted with carbon dioxide for carbon separation treatment and solid-liquid separation.

[0011] In the present invention, the fly ash can be an existing conventional type fly ash, for example, the fly ash can be a pulverized coal furnace fly ash or a circulating fluidized bed boiler fly ash; the fly ash Aluminum extraction residue refers to the residue obtained after extracting aluminum from fly ash. The method for extracting aluminum can be a conventional acid method in this field, such as hydrochloric acid method, sulfuric acid method, nitric acid method or ammonium sulfate method, etc....

Embodiment 1

[0031] This embodiment is used to illustrate the preparation method of ultrapure water glass.

[0032] Fly ash (composition is as shown in Table 1, the same below) is mixed with sodium hydroxide solution, the mol ratio of the sodium hydroxide in the sodium hydroxide solution and the silicon dioxide in the fly ash is 2.0, the sodium hydroxide solution The mass concentration is 10%, the mixture obtained is stirred and reacted at 95° C. for 60 min, then carbon dioxide is introduced at this temperature until the pH value of the slurry reaches 11.5, and ultrapure water glass A1 and desiliconization slag (containing alumina 57.61 wt%), the iron oxide content detected in the ultrapure water glass A1 is 1.2ppm.

[0033] The above-mentioned desiliconization slag was subjected to aluminum extraction treatment, referring to Example 1 of patent CN201310594879.2, the alumina dissolution rate was 98.6%. Table 1

[0034] SiO 2

Embodiment 2

[0036] The fly ash aluminum extraction residue (composition is as shown in Table 2, the same below) is mixed with sodium hydroxide solution, the mol ratio of the sodium hydroxide in the sodium hydroxide solution and the fly ash aluminum extraction residue is 1.2, the mass concentration of sodium hydroxide solution is 25%, the obtained mixture is stirred and reacted at 150°C for 15min, then cooled to 80°C, and carbon dioxide is introduced until the pH value of the slurry reaches 11.0, and ultrapure water glass A2 is obtained by filtration. For silicon slag, the iron oxide content in the ultrapure water glass A2 was detected to be 1.3ppm.

[0037] Table 2

[0038] SiO 2

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Abstract

The invention relates to the field of water glass, and discloses a preparation method of high-purity water glass and a method for preparing low-iron white carbon black and ultra-white glass raw materials by using the high-purity water glass obtained by the preparation method as a raw material. The preparation method of high-purity water glass includes: (1) contacting fly ash and / or fly ash aluminum extraction residue with alkali solution to carry out alkali-soluble desiliconization; (2) solid-liquid mixed slurry obtained after the alkali-soluble desiliconization treatment Contact with carbon dioxide for carbon treatment and solid-liquid separation. The preparation method is carried out continuously through alkali-soluble desiliconization and carbonization (that is, the slurry after alkali-soluble desiliconization is not subjected to solid-liquid separation, but is directly subjected to carbonization), and one-step solid-liquid separation can obtain ultrapure water glass, making full use of pulverized coal The characteristics of ash and fly ash extracting aluminum residue make it play the role of precipitation growth crystal nuclei and adsorption precipitation, which improves the efficiency of impurity removal.

Description

technical field [0001] The invention relates to the field of water glass, in particular to a method for preparing high-purity water glass and a method for preparing low-iron white carbon black and ultra-white glass raw materials by using the high-purity water glass obtained by the preparation method as a raw material. Background technique [0002] The main components of fly ash are alumina and silica, accounting for more than 80-90% of the total weight of fly ash. Extracting alumina from fly ash can alleviate the shortage of bauxite in my country, and is an important way for high-value utilization of fly ash. In order to improve the economy of extracting aluminum from fly ash and avoid the formation of new solid waste, it is necessary to study the extraction and utilization technology of silica in fly ash and aluminum extraction slag. [0003] The composition and phase of fly ash and aluminum extraction residue are complex and changeable, especially impurities, which pose a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/32C01B33/18C03C6/02
CPCC01B33/18C01B33/32C01P2006/80C03C1/00
Inventor 赵利军陈爱国王晓欢刘汇东肖永丰
Owner CHNA ENERGY INVESTMENT CORP LTD
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