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Method for directly utilizing waste liquor containing phosphoric acid and phosphorous acid

A phosphorous acid, waste liquid technology, applied in chemical instruments and methods, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the research and utilization method of phosphorous acid and orthophosphoric acid waste liquid It is reported that it is difficult to find a supporting production device for general calcium, and the recycling of yellow phosphorus dearsenic waste liquid is difficult to achieve the effect of high added value of the product, good economic practicability, and simple production device.

Inactive Publication Date: 2010-07-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in actual industrial production, the waste liquid is mainly sent to the ordinary calcium workshop for the production of ordinary calcium with acid. Although this can eliminate the pollution of the arsenic-containing waste liquid to the environment, it can achieve the purpose of partially recovering and utilizing the valuable phosphorus in the waste liquid. , but because the added value of ordinary calcium is not high, it is difficult to reflect the value of resource utilization; on the other hand, with the rapid development of high-concentration phosphate fertilizers in recent years, ordinary calcium products have been gradually eliminated, so it has been near the preparation of the yellow phosphorus removal arsenic device It is difficult to find the corresponding production equipment for ordinary calcium, which also brings difficulties to the recycling of yellow phosphorus dearsenic waste liquid
[0003] Since the waste liquid contains 12-16% of phosphorous acid and 14-16% of orthophosphoric acid, if not effectively utilized, it will not only cause waste of phosphorus resources, but also cause serious environmental pollution. The utilization method of waste liquid is of great significance to the protection of the environment and the comprehensive utilization of industrial waste resources
[0004] There are no reports on the relevant research and utilization methods on the direct utilization of waste liquid containing phosphorous acid and orthophosphoric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add in the beaker containing As265ppm, H 3 PO 3 14.75%, H 3 PO 4 15. 400 g of 62% waste liquid, after heating up to 85°C, add 0.4 g of phosphorus pentasulfide, stir and react at a constant temperature of 85°C for 1.0 hour, cool, let stand for 18 hours, and then vacuum filter. When the filtrate is heated to 60°C, neutralize with sodium hydroxide solution under stirring conditions and adjust the pH value of the solution to 8.5. Continue to stir and react for 0.5h under this condition. After the reaction is completed, the solution is concentrated by vacuum evaporation to a solution volume of 180 gram hour, crystallization by cooling, separation, and drying to obtain disodium hydrogen phosphate (Na 2 HPO 4 12H 2 O) 226 grams of product. The separated mother liquor is concentrated by secondary vacuum evaporation, crystallized by cooling, and dried to disodium hydrogen phosphite (Na 2 HPO 3 ·5H 2 O) 157 grams of product. After analyzing the product, the disodium hyd...

Embodiment 2

[0016] Add in the beaker containing As265ppm, H 3 PO 3 14.75%, H 3 PO 4 15. 400 g of 62% waste liquid, after heating up to 90°C, add 0.36 g of phosphorus pentasulfide, stir and react at a constant temperature of 90°C for 1.5 hours, cool, let stand for 24 hours, and then vacuum filter. When the filtrate is warmed up to 70°C, neutralize with sodium carbonate solution under stirring conditions and adjust the pH value of the solution to 8.0, continue to stir and react under this condition for 1.0h. After the reaction is completed, the solution is concentrated by vacuum evaporation to a solution volume of 180 After 1 g, crystallize by cooling, separate, and dry to 225 g of disodium hydrogen phosphate product. The separated mother liquor was concentrated by vacuum evaporation twice, crystallized by cooling, and dried to 158 grams of disodium hydrogen phosphite product. After analyzing the product, the disodium hydrogen phosphate product meets the first-class index requirements o...

Embodiment 3

[0018] Add in the beaker containing As265ppm, H 3 PO 3 14.75%, H 3 PO 4 15.62% waste liquid 400g, after heating up to 85°C, add 0.38g of phosphorus pentasulfide, stir and react at a constant temperature of 85°C for 1.0 hour, cool, let stand for 18h, and then vacuum filter. When the filtrate is warmed up to 85°C, neutralize with potassium hydroxide solution and adjust the pH value of the solution to 4.5 under stirring conditions, continue to stir and react for 1.0h under this condition, after the reaction is completed, the solution is concentrated by vacuum evaporation to a solution volume of 150 grams, crystallization by cooling, separation, and drying to 78 grams of potassium dihydrogen phosphate product. The separated mother liquor was concentrated by vacuum evaporation for the second time, crystallized by cooling, and dried to obtain 93 grams of potassium dihydrogen phosphite product. After analyzing the product, the potassium dihydrogen phosphate product meets the firs...

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Abstract

The invention discloses a method for directly utilizing waste liquor containing phosphoric acid and phosphorous acid. In the method, yellow phosphorus refine dearsenization waste liquor containing the phosphorous acid and the orthophosphoric acid is dearsenized by phosphorus pentasulfide and is directly neutralized to obtain the mixed solution of phosphate and phosphite; and according to the solubility difference of the phosphate and phosphite, a fractional crystallization method is adopted to concentrate, crystallize and separate to obtain the product of orthophosphate and the phosphite. The process has the characteristics of simple treatment process, easy and safe operation, high phosphorus recovery rate, capability of comprehensively utilizing wastes and the like.

Description

technical field [0001] The invention relates to the technical field of utilization of industrial waste liquid in the chemical industry, in particular to a method for directly utilizing waste liquid containing phosphoric acid and phosphorous acid. Background technique [0002] The waste liquid containing phosphoric acid and phosphorous acid is the waste liquid containing arsenic produced in the process of refining and removing arsenic from yellow phosphorus by aqueous phase oxidation method to produce low arsenic. At present, in actual industrial production, the waste liquid is mainly sent to the ordinary calcium workshop for the production of ordinary calcium with acid. Although this can eliminate the pollution of the arsenic-containing waste liquid to the environment, it can achieve the purpose of partially recovering and utilizing the valuable phosphorus in the waste liquid. , but because the added value of ordinary calcium is not high, it is difficult to reflect the value...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52C02F1/66C02F1/04C02F101/20C02F101/10
Inventor 苏毅李国斌查坐统
Owner KUNMING UNIV OF SCI & TECH
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