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Method for producing phosphate by purifying phosphorus mud to prepare acid

A phosphate and phosphorus sludge technology, applied in the direction of phosphate, phosphoric acid, phosphorus oxyacid, etc., can solve the problems of low phosphorus recovery rate, environmental pollution, poor quality of phosphate, etc., and achieve high recovery rate and low impurity content , easy-to-operate effect

Inactive Publication Date: 2013-03-06
GUIZHOU KAILIN GRP CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for purifying phosphorus mud to make acid to produce phosphate, so as to solve the problems in the prior art that the recovery rate of phosphorus in phosphorus mud is low, the quality of the produced phosphate is not good, and the recycling process is easy to cause environmental pollution.

Method used

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  • Method for producing phosphate by purifying phosphorus mud to prepare acid

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Effect test

Embodiment 1

[0030] The arsenic content of phosphoric acid with a mass concentration of 70% is 0.0066% after analysis, and the arsenic content in the produced sodium hexametaphosphate is 0.0083%, which cannot meet the requirements of qualified products. Add 5 kg of phosphorus pentasulfide to the above 10 tons of phosphoric acid, keep the temperature at 55°C and stir for 40 minutes to press filter, the purified acid after the press filter is used for the production of sodium hexametaphosphate, and the arsenic content in the produced sodium hexametaphosphate is 0.0002 %, fully meet the requirements of qualified products.

Embodiment 2

[0032] The arsenic content of phosphoric acid with a mass concentration of 65% is 0.0053% after analysis. The arsenic content in the potassium dihydrogen phosphate produced with this acid is 0.0062%, and the product quality is unqualified. Add 3.4 kg of phosphorus pentasulfide to the 8 tons of phosphoric acid produced by burning phosphorus mud, keep the temperature at 65°C and stir for 45 minutes to press filter. The purified acid after the press filter is used for the production of potassium dihydrogen phosphate. The content is 0.0001%, and the product quality is qualified.

Embodiment 3

[0034] The arsenic content of phosphoric acid with a mass concentration of 65% is 0.0053% after analysis. The arsenic content in the potassium dihydrogen phosphate produced with this acid is 0.0062%, and the product quality is unqualified. Add 3.4 kg of phosphorus pentasulfide to the 8 tons of phosphoric acid produced by burning phosphorus mud, keep the temperature at 80°C and stir for 50 minutes to press filter. The purified acid after the press filter is used to produce potassium dihydrogen phosphate. The content is 0.0003%, and the product quality is qualified.

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Abstract

The invention discloses a method for producing phosphate by purifying phosphorus mud to prepare acid, which is characterized by comprising the following steps of: firstly, burning the phosphorus mud in a phosphorus burning furnace; adsorbing by water in an adsorption tower to generate phosphoric acid with the mass concentration of over 75 percent; then performing a reaction on phosphorus pentasulfide and arsenic acid in the phosphoric acid to generate arsenic trisulfide and phosphoric acid; by adopting a pressure filtration separation method, separating out the arsenic trisulfide which is insoluble in the phosphoric acid to purify the phosphoric acid; and producing the phosphate by the purified phosphoric acid. The method has a high recovery rate on phosphorus in the phosphorus mud; arsenic in the phosphoric acid is removed by adopting the phosphorus pentasulfide, no other byproducts are generated besides the arsenic trisulfide which is insoluble in the phosphoric acid, and the quality of the finally obtained phosphate is ensured; and phosphorus pentoxide generated after the phosphorus mud is burnt is washed and absorbed by water, the absorptivity is good, washed tailing gas cannot cause pollution to the environment, the whole technical process is simple and is easy to operate.

Description

technical field [0001] The invention relates to a method for producing phosphate by purifying phosphorus mud to make acid, and belongs to the technical field of chemical industry. Background technique [0002] During the production of yellow phosphorus, the furnace gas contains impurities such as fine dust and coke powder. After being washed and cooled by water in the gas scrubber, milky phosphorus sludge is formed in the phosphorus receiving tank. Usually, one ton of yellow phosphorus produces about 350 kg of phosphorus sludge, and the composition of phosphorus sludge is also different due to the different ore components. Generally, phosphorus mud contains 30%-60% yellow phosphorus, and other impurities mainly include silicon dioxide, calcium oxide and a small amount of iron oxide. The rational use of phosphorus sludge is a very important issue for yellow phosphorus production enterprises. It is not only related to the cost of yellow phosphorus production, but also related...

Claims

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Application Information

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IPC IPC(8): C01B25/20C01B25/26
Inventor 徐魁廖吉星朱飞武彭宝林潘礼富周勇宋同彬王先炜
Owner GUIZHOU KAILIN GRP CO LTD
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