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Crystallization method and crystallization device for preparing feed grade calcium hydrogen phosphate from low-concentration phosphorus-containing wastewater

A calcium hydrogen phosphate and crystallization device technology, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of long settling time, small crystal particle size, and large dust without using packaging, so as to increase the settling speed, Effect of reducing packaging dust

Pending Publication Date: 2019-08-06
WENGFU (GRP) CO LTD
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Problems solved by technology

[0002] The average particle size of the low-concentration phosphorus-containing wastewater in the prior art is 20-25 microns in the process of producing feed and calcium hydrogen phosphate. Because of its small crystal particle size, it will take a long time to settle during the production process, and the dust after drying and packaging is too large to be used. Packaging and other issues

Method used

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  • Crystallization method and crystallization device for preparing feed grade calcium hydrogen phosphate from low-concentration phosphorus-containing wastewater
  • Crystallization method and crystallization device for preparing feed grade calcium hydrogen phosphate from low-concentration phosphorus-containing wastewater

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Embodiment Construction

[0016] A crystallization method for preparing feed-grade calcium hydrogen phosphate from low-phosphorus-containing wastewater, the method comprising the following steps: (1) performing primary treatment on low-concentration phosphorus-containing wastewater, sending the treated slag to sewage treatment, and the clear liquid into the lower a stage;

[0017] (2) Add the corresponding crystallization regulator to the supernatant, mix well, and control the pH between 1.8 and 2.5;

[0018] (3) The mixed liquid is controlled by adding calcium hydroxide solution in two stages, the pH of the first stage is controlled between 3.5 and 4.8, and the pH of the second stage is controlled between 4.2 and 6.2;

[0019] (4) The slurry after the second-stage reaction is settled, separated, dehydrated, and dried to obtain a product with a particle size of 38-42 microns.

[0020] Realize the device that said method adopts, and it is made up of primary reaction tank 1, the first settling tank 2, m...

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Abstract

The invention discloses a crystallization method and a crystallization device for preparing feed grade calcium hydrogen phosphate from low-concentration phosphorus-containing wastewater. The method comprises the following steps: carrying out primary treatment on the low-concentration phosphorus-containing wastewater, allowing residues obtained after the treatment to enter sewage treatment, and allowing a clear liquid obtained after the treatment to enter a next stage; adding a corresponding crystallization regulator to the clear liquid, performing full mixing, and controlling the pH value of the obtained liquid to 1.8-2.5; adding a calcium hydroxide solution to the mixed liquid in two stages, wherein the pH value in the first stage is controlled at 3.5-4.8, and the pH value in the second stage is controlled at 4.2-6.2; and carrying out settling, separating dehydration and drying on a slurry obtained after a two-stage reaction to obtain the product with a particle size of 38-42 [mu]m. The method and the device for preparing the feed grade calcium hydrogen phosphate from phosphorus-containing wastewater have the advantages of increase of particle size of the final product to 38-42 [mu]m from original 20-25 [mu]m, effectiveness in improvement of the material settling rate, and reduction of packaging dusts.

Description

technical field [0001] The invention relates to the field of low-phosphorus wastewater treatment and production, in particular to a crystallization method and device for preparing feed-grade calcium hydrogen phosphate from low-phosphorus wastewater. Background technique [0002] The average particle size of the low-concentration phosphorus-containing wastewater in the prior art is 20-25 microns in the process of producing feed and calcium hydrogen phosphate. Because of its small crystal particle size, it will take a long time to settle during the production process, and the dust after drying and packaging is too large to be used. Packaging and other issues. [0003] In order to solve the above problems, the applicant proposed a crystallization idea for preparing feed-grade calcium hydrogen phosphate from phosphorus-containing wastewater, and carried out corresponding optimization on the basis of the original one. Contents of the invention [0004] The object of the presen...

Claims

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Application Information

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IPC IPC(8): C01B25/32
CPCC01B25/32C01P2004/61
Inventor 周智武卢群
Owner WENGFU (GRP) CO LTD
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