Method for improving by-product phosphogypsum quality during phosphoric acid production process

A technology of production process and by-product phosphorus, which is applied in the field of phosphoric acid, can solve the problems of no improvement in the quality of phosphogypsum, no new technology, and difficulty in expanding the scope of use, and achieve the effect of reducing phosphorus content and improving quality

Active Publication Date: 2014-01-08
GUIZHOU JINLIN CHEM
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Problems solved by technology

[0004] One of the difficulties in the utilization of phosphogypsum is that the quality cannot meet the needs of the product, and the dihydrate content in phosphogypsum is only 90%, so i

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  • Method for improving by-product phosphogypsum quality during phosphoric acid production process

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[0015] Example:

[0016] Guizhou Jinlin Chemical Co., Ltd. has built an industrialized plant with an annual processing capacity of 10,000 tons of phosphate concentrate by-product phosphogypsum. The process flow is as follows:

[0017] First, the phosphate concentrate is measured by the feeding belt, and enters the reaction tank together with the phosphoric acid measured by the flow meter. The liquid-solid ratio of phosphoric acid and the phosphate concentrate is controlled to be 8:1, and the reaction time is 4 hours at a temperature of 35 ° C. The reaction slurry enters the plate frame. filter press, remove the filter residue, and the filtrate enters the second reaction tank.

[0013] After the filtrate was sampled and analyzed for calcium content, the reaction formula Ca of extracting phosphoric acid was 2+ +SO 4 2- =CaSO 4 Calculate the theoretical amount of sulfuric acid, and then determine the amount of sulfuric acid according to 0.9 to 1.1 times the theoretical amo...

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Abstract

The invention discloses a method for improving the by-product phosphogypsum quality during a phosphoric acid production process. The method comprises the steps that: (1) phosphoric acid is subjected to a reaction with phosphate concentrate; filtering is carried out, such that a filtrate containing calcium dihydrogen phosphate, calcium hydrogen phosphate, and phosphoric acid is obtained; and the filtrate is delivered to an extraction tank; (2) the filtrate is subjected to an extraction reaction in the extraction tank by using sulfuric acid with calcium dihydrogen phosphate and calcium hydrogen phosphate, and an obtained extract liquid is dilute phosphoric acid containing phosphogypsum; during the process, through analyzing filtrate calcium content, sulfuric acid theoretical dose is calculated according to a phosphoric acid extraction reaction formula, and sulfuric acid addition amount is determined; and (3) the extraction liquid is filtered by using a filtering machine, such that dilute phosphoric acid and phosphogypsum comprising 97% of dehydrate are obtained. In the phosphogypsum provided by the invention, dihydrate gypsum content is greatly higher than that of prior art, phosphorus content is substantially reduced, and phosphogypsum quality is greatly improved. Therefore, good raw material is provided for downstream phosphogypsum construction material manufacturing, and a basis is provided for sufficient utilization of phosphogypsum. The method is suitable for wet-method phosphoric acid production enterprises intending to utilize phosphogypsum.

Description

technical field [0001] The present invention relates to phosphoric acid and, in particular, to phosphogypsum by-produced in the production of phosphoric acid. technical background [0002] As we all know, phosphogypsum is the waste residue produced in the industrial production process of phosphoric acid and phosphate fertilizer. About 4 to 6 tons of gypsum are discharged per ton of wet-process phosphoric acid produced. At present, about 200 million tons of phosphogypsum slag are discharged every year in the world, and 50 million tons are discharged in my country every year. more than tons. The phosphogypsum produced in the production of phosphoric acid in various countries in the world is mostly piled up as waste, which requires land resources, and the fluorine and phosphorus in the piled up phosphogypsum will leach out with the rainwater after being leached by rainwater, and enter the soil or rivers, causing surface water and Groundwater pollution. Therefore, in recent yea...

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Application Information

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IPC IPC(8): C01F11/46C01B25/22
Inventor 张文胜吴健金先煜陈开翔但永东梁强立罗雅超
Owner GUIZHOU JINLIN CHEM
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