Method for controlling pH (potential of hydrogen) of ammonium sulphate solution prepared by phosphogypsum

A control method, gypsum technology, applied in the direction of ammonium sulfate, etc., can solve the problem of high pH value of the solution, and achieve the effect of improving product quality, reducing cost, and simple method

Active Publication Date: 2012-08-01
WENGFU (GRP) CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a method for controlling the pH of the ammonium sulfate solution produced fro

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  • Method for controlling pH (potential of hydrogen) of ammonium sulphate solution prepared by phosphogypsum

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Embodiment 1

[0014] Accompanying drawing has schematically illustrated flow process technology of the present invention, and certain limited liability company phosphate fertilizer factory adopts the control method of a kind of phosphogypsum system ammonium sulfate solution pH of the present invention: put a neutralization tank 4, phosphoric acid storage tank 6 behind the ammonium sulfate solution storage tank And pump, phosphoric acid is added in the phosphoric acid storage tank 6 from phosphoric acid inlet 2, and the phosphoric acid in the phosphoric acid storage tank 6 is pumped into the neutralization tank 4 through the valve 9 through the pump 10, and reacts with the ammonium sulfate solution that enters the neutralization tank 4 from the solution inlet 1, There is a neutralization agitator 7 in the neutralization tank 4 to speed up the reaction by stirring, the pH value of the solution after the reaction is detected by the pH detector 8 on the bypass circulation pipe of the neutralizati...

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Abstract

A method for controlling pH (potential of hydrogen) of ammonium sulphate solution prepared by phosphogypsum includes arranging a neutralizing tank, a phosphoric acid storage tank and a pump at the rear of an ammonium sulphate solution storage tank; pouring phosphoric acid in the phosphoric acid storage tank into the neutralizing tank; leading the phosphoric acid to be reacted with solution pouredinto the neutralizing tank from the ammonium sulphate solution storage tank; detecting the pH value of the solution after reaction by a pH detector on a bypass circulation tube of the neutralizing tank; and adjusting the adding quantity of the phosphoric acid to control the pH value of the solution within a range of 5.0-6.0, and controlling the qualified ammonium sulphate solution in the neutralizing tank to carry out a next procedure. Free ammonia and a small quantity of ammonium carbonate in the ammonium sulphate solution are neutralized by the phosphoric acid, and generated monoammonium phosphate is used as adhesive needed by a downstream granulation workshop. The method is simple, actual use proves that an effect is remarkable, the free ammonia of a system is recycled sufficiently, and the method provides a guarantee for reducing cost and increasing quality of products, and can be applied to the field of preparing ammonium sulphate by phosphogypsum.

Description

technical field [0001] The invention relates to the control of the pH value of the solution, in particular to a method for controlling the pH of the ammonium sulfate solution prepared from phosphogypsum. Background technique [0002] Phosphogypsum is the industrial waste residue produced when sulfuric acid is used to extract phosphate rock in the production of wet-process phosphoric acid. About 5 tons of phosphogypsum are discharged for every ton of phosphoric acid produced. It is also a sulfur-containing resource. Nowadays, most of the phosphogypsum waste residue is stored and landfilled. Disposal not only wastes resources and occupies land, but also has great harm to the environment. The effective utilization of phosphogypsum is an urgent problem to be solved in phosphorus chemical industry. Wengfu (Group) Co., Ltd. developed phosphogypsum ammonium sulfate to solve this problem. Phosphogypsum ammonium sulfate uses chemical by-products phosphogypsum, carbon dioxide, and amm...

Claims

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Application Information

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IPC IPC(8): C01C1/24
Inventor 王程赵邦杰游光刚
Owner WENGFU (GRP) CO LTD
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