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Method for recovering product from waste residues containing sodium fluoride

A technology for recovering products and sodium fluoride, applied in the direction of alkali metal fluoride and the like, can solve the problems of only reaching the yield, difficulty in smooth production, product loss, etc., so as to improve the yield, avoid product loss, and save production costs. Effect

Active Publication Date: 2013-12-11
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The generation of such a large amount of waste slag causes frequent disassembly and assembly of filters, which increases the labor intensity of workers and makes it difficult to carry out production smoothly; moreover, because the waste slag mainly contains products, this also causes a large loss of products and seriously affects the yield of products , so that the product yield of this production process only reaches 55% to 70%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] At 15°C, inject 4.8t of ionized water into the dissolving tank, start stirring, put 200kg of waste residue into the dissolving tank in batches, continue stirring for 40 minutes after throwing in, stop stirring, and transport the solid-liquid mixture to a centrifuge for filtration. Throw it away, and the mother liquor goes into the treatment tank. Drop into 340kg of sodium chloride in the treatment tank and continue to stir for 30min. Stop stirring and let stand for 1h.

[0035] The solid-liquid mixture is pumped into a centrifuge for filtration, and the solid is dried.

[0036] After the waste residue is treated, 106kg of sodium fluoride product can be obtained, the product recovery rate is 53.3%, and the product purity is 99.98%.

Embodiment 2

[0038] At 15°C, inject 4.8t of deionized water into the dissolving tank, start stirring, put 200kg of waste residue into the dissolving tank in batches, continue stirring for 40 minutes after feeding, stop stirring, and transport the solid-liquid mixture to a centrifuge for filtration. The filter residue is thrown away, and the mother liquor enters the treatment tank. Drop into 830kg of sodium chloride in the treatment tank and continue to stir for 40min. Stop stirring and let stand for 1h.

[0039] The solid-liquid mixture is pumped into a centrifuge for filtration, and the solid is dried.

[0040] After the waste residue is treated, 133kg of sodium fluoride product can be obtained, the product recovery rate is 66.7%, and the product purity is 99.45%.

Embodiment 3

[0042] At 15°C, inject 4.8t of deionized water into the dissolving tank, start stirring, put 200kg of waste residue into the dissolving tank in batches, continue stirring for 40 minutes after feeding, stop stirring, and transport the solid-liquid mixture to a centrifuge for filtration. The filter residue is thrown away, and the mother liquor enters the treatment tank. Drop into the sodium chloride of 170kg in the processing tank, continue stirring 20min. Stop stirring and let stand for 1h.

[0043] The solid-liquid mixture is pumped into a centrifuge for filtration, and the solid is dried.

[0044] After the waste residue is treated, 81.7kg of sodium fluoride product can be obtained, the product recovery rate is 40.8%, and the product purity is 99.99%.

[0045] The product recovery rate of the invention is as high as 66.7%, effectively avoiding product loss, improving product yield, saving production cost, and the recovered sodium fluoride product has a purity as high as 99....

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Abstract

The invention discloses a method for recovering a product from waste residues containing sodium fluoride. The method comprises the following steps of: (1) dissolving the waste residues containing sodium fluoride: (i) calculating the mass of deionized water, and (ii) dissolving, filtering, and putting a mother solution into a treatment tank; and (2) treating the mother liquid: (i) feeding, dissolving, putting a substance containing same sodium ions with sodium fluoride into the treatment tank, and stirring to ensure that the fed solid material is completely dissolved, (ii) standing after stopping stirring to ensure that precipitated product substances form a large-particle solid, and (iii) filtering and drying to obtain a sodium fluoride product. According to the method, the product recovery rate is up to 40-70%, the yield of the product is improved, the production cost is saved, and the purity of the recovered sodium fluoride product is up to 99.99%.

Description

technical field [0001] The invention belongs to a method for recovering products from chemical production waste residues, in particular to a method for recovering products from waste residues containing sodium fluoride by using the same ion effect. Background technique [0002] A large amount of waste gas, waste liquid and waste residue are often produced in chemical production. The generation of three wastes has brought many problems to production and life, not only polluting the environment, but also increasing production costs. In particular, a large amount of waste slag produced in some chemical production is a mixture of various substances, including insoluble impurities brought in by raw materials, unreacted raw materials, by-products generated by reactions, and products. According to the law of conservation of mass, these waste residues are also transformed from raw materials. If they are thrown away as garbage, it will cause loss of raw materials and waste of product...

Claims

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Application Information

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IPC IPC(8): C01D3/02
Inventor 王晶周红艳汤进军朱昱孙士群郝连发
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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