A kind of comprehensive utilization method of silicon slag

A technology of silicon slag soil and silicon slag, which is applied in the field of comprehensive utilization of industrial waste residue, can solve the problems of affecting ecological balance, occupying land, polluting the environment, etc., and achieves the effects of easy operation, short processing time, and short process flow

Active Publication Date: 2017-09-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica slag is the waste slag produced by water treatment production enterprises. At present, it is mainly treated as waste slag. Since the slag contains a large amount of valuable elements such as silicon and aluminum, stacking will not only waste resources, but also occupy land, pollute the environment, and affect ecological balance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A. In a polytetrafluoroethylene reaction vessel, add 600 grams of hydrofluoric acid with a mass percentage concentration of 40%, then add 200 grams of silicon dregs at a mass ratio of 3.0:1, and react for 20 minutes at room temperature and at a stirring speed of 300 rpm. Separation to obtain leachate and leach residue;

[0021] B. The leaching solution obtained by separation in step A is heated and volatilized at 90°C under normal pressure until it becomes a wet salt, stop heating, add 50mL of water, mix well at room temperature, filter, wash the filter residue with water twice at 50mL / time, and dry to obtain fluoride Aluminum products, combined and collected 2 times of washing liquid for subsequent use; 820 grams of 40% sodium hydroxide solution is used to absorb the volatilized gas;

[0022] C. Mix the absorption solution obtained in step B and the washing solution evenly, filter, wash the filter residue with water 3 times in an amount of 350mL / time, dry to obtain the...

Embodiment 2

[0029] A. In a polytetrafluoroethylene reaction vessel, add 700 grams of hydrofluoric acid with a mass percent concentration of 40%, then add 200 grams of silicon dregs at a mass ratio of 3.5:1, and react for 25 minutes at room temperature and at a stirring speed of 200 rpm. Separation to obtain leachate and leach residue;

[0030] B. The leaching solution separated in step A is heated and volatilized at 80°C under normal pressure until it becomes a wet salt. Stop heating, add 60 mL of water, mix well at room temperature, filter, wash the filter residue with 60 mL / time of water twice, and dry to obtain fluorine Aluminum products, combined and collected 2 times of washing liquid for subsequent use; 800 grams of 40% sodium hydroxide solution is used to absorb all the volatilized gas;

[0031] C. Mix the absorption liquid and washing liquid obtained in step B evenly, filter, wash the filter residue 3 times with water in an amount of 500mL / time, dry the filter residue to obtain th...

Embodiment 3

[0038] A. In a polytetrafluoroethylene reaction vessel, add 640 grams of hydrofluoric acid with a mass percent concentration of 40%, then add 200 grams of silicon dregs at a mass ratio of 3.2:1, and react for 30 minutes at room temperature and at a stirring speed of 250 rpm. Separation to obtain leachate and leach residue;

[0039] B. The leaching solution separated in step A is heated and volatilized at 85°C under normal pressure until it becomes a wet salt. Stop heating, add 55 mL of water, mix well at room temperature, filter, wash the filter residue with 55 mL / time of water twice, and dry to obtain fluorine Aluminum products, combined and collected 2 times of washing liquid for subsequent use; 840 grams of 40% sodium hydroxide solution is used to absorb the volatilized gas;

[0040] C, the absorption liquid obtained in step B and the washing liquid and the mother liquor after the separation of sodium fluoride in step F of embodiment 2 are mixed uniformly, filtered, and the...

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PUM

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Abstract

The invention discloses a comprehensive utilization method of silicon residue soil. The comprehensive utilization method comprises the following steps: leaching and decomposing the silicon residue soil by adopting an acid solution, leaching and separating residues, separating alumsili through volatilizing leaching liquid, obtaining an aluminum fluoride product, and absorbing, acidifying and washing volatile matters to obtain white carbon black and a sodium fluoride product. The comprehensive utilization method disclosed by the invention has the characteristics of being short in process flow and processing time, simple in process equipment, and easy and safe to operate, is a process technology route for comprehensive resource utilization of high value-added chemical products produced by utilizing industrial wastes and can achieve secondary comprehensive resource utilization and realize the purposes of circular economy, energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the field of solid waste utilization in the chemical industry, and in particular relates to a method for comprehensive utilization of industrial waste generated in the production process of water treatment agents. Background technique [0002] Silica slag is a water treatment production enterprise. It uses low-grade bauxite and leaches it under constant temperature and pressure to produce polyaluminum sulfate, aluminum chloride and other water treatment agents. The industrial waste generated by separation is mainly composed of SiO 2 and aluminum, where SiO 2 Content 80~84%, Al 2 o 3 Content 15~18%, SiO 2 and Al 2 o 3 Accounting for more than 95%, it is a better secondary resource. Silica slag is the waste slag produced by water treatment production enterprises. At present, it is mainly treated as waste slag. Since the slag contains a large amount of valuable elements such as silicon and aluminum, stacking will not only wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/50C01D3/02C01B33/12
CPCC01B33/12C01D3/02C01F7/50
Inventor 苏毅孙成郑峰伟李国斌罗康碧李沪萍胡亮梅毅
Owner KUNMING UNIV OF SCI & TECH
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