Treatment method for potassium nitrate wastes

A treatment method, potassium nitrate technology, applied in the chemical industry, can solve the problems of high cost of potassium nitrate waste and complex recycling process, and achieve the effect of purification, simple process, and full utilization of energy

Inactive Publication Date: 2015-05-13
XUANCHENG HENGTAI ELECTRONICS CHEM MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the above-mentioned traditional method to recycle and process the potassium nitrate waste produced by strengthened glass is not only costly, but also the recovery process is complicated. One of the topics under study

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] a) Collect potassium nitrate waste produced by chemically strengthening glass, mix potassium nitrate waste with water according to a mass ratio of 6:3 to obtain diluted waste liquid. The potassium nitrate concentration in said potassium nitrate waste is 90%-99% ;

[0014] b) Heat the diluted waste liquid to 50-100°C. After it is completely dissolved, filter the dissolved solution through a soft water resin with a pore size of 1-100um to remove sodium nitrate. The filtered filtrate is reduced to 10-30°C, and then crystallization is performed. After dehydration and drying, potassium nitrate powder is obtained. After testing, the purity of potassium nitrate in the potassium nitrate powder is 99.97%.

Embodiment 2

[0016] a) Collect potassium nitrate waste produced by chemically strengthening glass, mix potassium nitrate waste with water according to a mass ratio of 6:5 to obtain diluted waste liquid. The potassium nitrate concentration in said potassium nitrate waste is 86%-88% ;

[0017] b) Heat the diluted waste liquid to 70-90°C. After it is completely dissolved, filter the dissolved solution through a soft water resin with a pore size of 1-100um to remove sodium nitrate. The filtered filtrate is reduced to 10-30°C, and then crystallization is performed. After dehydration and drying, potassium nitrate powder is obtained. After testing, the purity of potassium nitrate in the potassium nitrate powder is 99.99%.

Embodiment 3

[0019] a) Collect potassium nitrate waste produced by chemically strengthening glass, mix potassium nitrate waste with water according to a mass ratio of 6:7 to obtain diluted waste liquid. The potassium nitrate concentration in said potassium nitrate waste is 88%-90% ;

[0020] b) Heat the diluted waste liquid to 50-100°C. After it is completely dissolved, filter the dissolved solution through a soft water resin with a pore size of 1-100um to remove sodium nitrate. The filtered filtrate is reduced to 15-20°C, and then dehydrated. After crystallization and drying, potassium nitrate powder was obtained. After testing, the purity of potassium nitrate in the potassium nitrate powder was 99.99%.

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Abstract

The invention relates to the technical field of chemical industry, in particular to a treatment method for potassium nitrate wastes. The method comprises the following steps: (a) collecting the potassium nitrate wastes generated during chemical enhanced treatment of glass, and adding water for mixing to obtain dilute waste liquor, wherein the concentration of potassium nitrate in the dilute waste liquor is 40-70%; (b) heating the dilute waste liquor to 50-100 DEG C for fully dissolving, performing filtration treatment on dissolved liquor to remove sodium nitrate and other impurities, cooling filter liquor obtained by filtering to lower than a room temperature, crystallizing, dewatering, and drying to obtain potassium nitrate powder. The potassium nitrate wastes are treated with the method for diluting and heating for dissolving, and then the filtration treatment is adopted for removing a relatively large amount of sodium nitrate, impurities and the like in the potassium nitrate wastes, so that the concentration of potassium nitrate in a potassium nitrate solution can be increased, a purification effect is achieved, and the obtained potassium nitrate powder can be sold as a product; specifically, the market price of existing potassium nitrate byproduct wastes is 1,000 yuan/ton, and the price of the potassium nitrate powder obtained after the potassium nitrate wastes are treated with the method disclosed by the invention is 10,000 yuan/ton.

Description

Technical field [0001] The present invention relates to the technical field of chemical industry, in particular to a method for processing potassium nitrate waste. Background technique [0002] Glass strengthening is a secondary processing technology of glass, that is, to increase the strength of glass by changing the chemical composition of the glass surface. At present, glass strengthening is divided into physical strengthening methods and chemical strengthening methods, while chemical strengthening methods mainly include ion exchange and desorption. Alkali method and surface crystallization method, among which ion exchange method is a common method for strengthening glass. The strengthening process is: acid corrosion → potassium nitrate strengthening → cleaning → drying. Specifically, the glass substrate is first placed in acid Soak in medium to corrode and remove the glass and impurities on the surface, and then soak in potassium nitrate at a temperature of up to 400℃ to exch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/16
CPCC01D9/16C01P2006/80
Inventor 陈仁政
Owner XUANCHENG HENGTAI ELECTRONICS CHEM MATERIAL
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