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Process for separating zirconium, silicon and aluminum from AZS solid wastes

A solid waste and process technology, applied in the direction of silicon oxide, silicon dioxide, zirconium compounds, etc., can solve the problems of low recycling rate and low added value of products, and achieve high recycling rate, high added value of products, and no waste water. The effect of emissions

Inactive Publication Date: 2015-12-23
SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a separation process of zirconium, silicon and aluminum in AZS solid waste, which solves the problems of low recycling rate and low added value of products in the current AZS solid waste recycling technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] AZS solid waste, the main composition is: Al 2 o 3 62.6%, SiO 2 15.5%, ZrO 2 20.5%. The separation process of zirconium, silicon and aluminum in AZS solid waste is as follows:

[0032] (1) Alkali fusion roasting:

[0033] Mix AZS solid waste, sodium hydroxide and flux borax in a weight ratio of 1:1:0.5, and bake at a temperature of 850°C for 90 minutes to obtain a sintered material. ZrO in AZS solid waste 2 、Al 2 o 3 and SiO 2 Converted into sodium zirconate, sodium metaaluminate and sodium metasilicate respectively;

[0034] (2) Separation by water immersion:

[0035] According to the solid-liquid weight ratio of 1:3, add water to the sintered material, keep it warm and stir at 85°C for 1 hour, so that the material is completely dispersed and dissolved, sodium metaaluminate and sodium metasilicate are dissolved in the solution, and filtered to obtain water-soluble The leaching solution of sodium metasilicate and sodium metaaluminate and the solid sodium zirco...

Embodiment 2

[0042] AZS solid waste, the main composition is: Al 2 o 3 53.5%, SiO 2 17.1%, ZrO 2 28.3%. The separation process of zirconium, silicon and aluminum in AZS solid waste is as follows:

[0043] (1) Alkali fusion roasting:

[0044] Mix AZS solid waste, sodium hydroxide and flux borax in a weight ratio of 1:0.85:0.7, and bake at a temperature of 650°C for 60 minutes to obtain a sintered material. ZrO in AZS solid waste2 、Al 2 o 3 and SiO 2 Converted into sodium zirconate, sodium metaaluminate and sodium metasilicate respectively;

[0045] (2) Separation by water immersion:

[0046] According to the proportion of solid-liquid weight ratio of 1:2, add water to the sintered material, keep it warm and stir at 80°C for 1.5h, so that the material is completely dispersed and dissolved, sodium metaaluminate and sodium metasilicate are dissolved in the solution, and filtered to obtain water-soluble The leaching solution of sodium metasilicate and sodium metaaluminate and the solid...

Embodiment 3

[0053] AZS solid waste, the main composition is: Al 2 o 3 53.5%, SiO 2 17.1%, ZrO 2 28.3%. The separation process of zirconium, silicon and aluminum in AZS solid waste is as follows:

[0054] (1) Alkali fusion roasting:

[0055] Mix AZS solid waste, sodium hydroxide and flux borax in a weight ratio of 1:0.9:0.6, and bake at a temperature of 750°C for 80 minutes to obtain a sintered material. ZrO in AZS solid waste 2 、Al 2 o 3 and SiO 2 Converted into sodium zirconate, sodium metaaluminate and sodium metasilicate respectively;

[0056] (2) Separation by water immersion:

[0057] According to the proportion of solid-liquid weight ratio of 1:4, add water to the sintered material, keep it warm and stir at 80°C for 80 minutes, so that the material is completely dispersed and dissolved, sodium metaaluminate and sodium metasilicate are dissolved in the solution, and filtered to obtain water-soluble The leaching solution of sodium metasilicate and sodium metaaluminate and th...

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Abstract

The invention relates to a process for separating zirconium, silicon and aluminum from AZS solid wastes, which belongs to the technical field of cyclic utilization of refractory solid wastes. AZS solid wastes are subjected to alkali fusion and roasting firstly so as to obtain a sintered material; the sintered material is subjected to water leaching for separating out zirconium, so that lixiviums of water-soluble metasilicate and meta-aluminate are obtained; and acid liquor is added into the lixiviums to react, so that an aluminum salt solution and a silica gel are obtained finally, thereby realizing the separation of silicon and aluminum, and solving the problems of low recovery and utilization rates and low added value of products existing in current recovery and utilization technologies of AZS solid wastes. Sodium zirconate obtained in the invention can be used for preparing zirconium oxychloride or zirconium sulfate, the silica gel can be used for preparing white carbon black, aluminum can be directly converted into aluminium hydroxide products, and the recovery rates of zirconium dioxide, aluminium oxide and silicon dioxide are all greater than or equal to 98%, therefore, the process has the characteristics of high recovery and utilization rates and high added value of products; and washing wastewater produced in the process can be recycled, thereby achieving the effect of no wastewater discharge, and reducing the environmental pollution.

Description

technical field [0001] The invention relates to a process for separating zirconium, silicon and aluminum from AZS solid waste, and belongs to the technical field of refractory solid waste recycling. Background technique [0002] AZS fused zirconia corundum brick is the main refractory material of the glass melting pool. Generally, it will be discarded after one furnace operation, which will cause a large amount of AZS solid waste to accumulate. At present, the annual consumption of AZS fused zirconia corundum bricks in my country reaches 200,000 to 300,000 tons. Calculated according to the consumption of 60% during use, the waste materials after use can reach 80,000 to 120,000 tons per year, which causes a great environmental impact. question. If these solid wastes are utilized, about 100,000 tons of refractory raw materials can be saved each year, thereby greatly reducing or even eliminating the accumulation of solid wastes. [0003] At present, the main method of recyclin...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01G25/00C01B33/14
Inventor 鲍猛王光强李玉芝刘学燕高延峰
Owner SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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