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A method for treating waste water produced by hydrochloric acid method to produce calcium hydrogen phosphate

A technology of calcium hydrogen phosphate and hydrochloric acid method, applied in the field of phosphorus chemical industry, can solve the problems of low added value of calcium chloride, limited phosphate fertilizer output, small market demand, etc., and achieve the effect of comprehensive comprehensive utilization

Active Publication Date: 2020-08-11
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the added value of calcium chloride is low, and the market demand is small. Most manufacturers solve the problem of excessive calcium chloride waste liquid by reducing the output of calcium hydrogen phosphate. This traditional production process ultimately limits the use of phosphate fertilizers. Yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment relates to the comprehensive utilization method of waste water in the calcium hydrogen phosphate production process, comprises the following steps:

[0028] 1) The waste water containing 20% ​​calcium chloride and the ammonia water containing 30% ammonia produced in the production process of calcium hydrogen phosphate are reacted in the reaction tank according to the volume ratio of 1:1.5, and the feed rate of ammonia water is controlled to be 3.5 during the reaction process. m 3 / h, the stirring speed in the reaction tank is 12 rpm, the stirring power of the stirrer should ensure that the reaction liquid reacts in a turbulent state, and the Reynolds number is guaranteed to be 1.5×10 4 ~2.0×10 4 , the reaction time was controlled at 20 minutes to generate a mixed liquid.

[0029] 2) The mixed liquid from the reaction tank enters the settling tank, adjust the pH value of the mixed liquid to 10-11 with 30% ammonia water, and then add flocculant po...

Embodiment 2

[0032] 1) The waste water containing 20% ​​calcium chloride and the ammonia water containing 30% ammonia produced by the production of calcium hydrogen phosphate are reacted in the reaction tank according to the volume ratio of 1:5. During the reaction, the feed rate of ammonia water is controlled to be 3.8m 3 / h, the stirring speed in the reaction tank is 13 rpm, the stirring power of the stirrer should ensure that the reaction liquid reacts in a turbulent state, and the Reynolds number is guaranteed to be 1.5×10 4 ~2.0×10 4 , the reaction time was controlled at 25 minutes to generate a mixed liquid.

[0033] 2) The mixed solution from the reaction tank enters the settling tank, adjust the pH value of the mixed solution to 10.5 with 30% ammonia water, and then add flocculant polyacrylamide, the molecular weight of polyacrylamide is 5 million to 6 million, during the addition process, polyacrylamide Firstly dilute the mixture with water to 60% volume percentage, and then pass...

Embodiment 3

[0036] 1) The waste water containing 20% ​​calcium chloride and the ammonia water containing 30% ammonia produced by the production of calcium hydrogen phosphate are reacted in the reaction tank according to the volume ratio of 1:2.5. During the reaction, the feeding speed of ammonia water is controlled to be 4m 3 / h, the stirring speed in the reaction tank is 15 rpm, the stirring power of the stirrer should ensure that the reaction liquid reacts in a turbulent state, and the Reynolds number is guaranteed to be 1.5×10 4 ~2.0×10 4 , the reaction time was controlled at 30 minutes to generate a mixed liquid.

[0037] 2) The mixed solution from the reaction tank enters the settling tank, adjust the pH value of the mixed solution to 11 with 30% ammonia water, and then add the flocculant polyacrylamide, the molecular weight of the polyacrylamide is 5 to 6 million, during the addition process, the polyacrylamide Dilute the mixture to 58% by volume with water first, and then pass the...

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Abstract

The invention relates to a method for treatment of wastewater generated in production of calcium hydrogen phosphate by a hydrochloric acid process. The method includes the steps of: 1) introducing ammonia water into wastewater generated in the production of calcium hydrogen phosphate by the hydrochloric acid process, and carrying out a reaction to obtain a mixed solution; 2) adding a flocculant into the mixed solution to obtain calcium hydroxide flocculent precipitate, and transporting the precipitate to a production system for recycling, thus obtaining calcium hydroxide removed wastewater; and 3) conducting concentration and drying on the calcium hydroxide removed wastewater so as to obtain the finished product ammonium chloride. The method provided by the invention converts calcium chloride in the wastewater into the calcium hydroxide and the ammonium chloride, the calcium hydroxide can be used as a raw material to participate in the next step of reaction, and the ammonium chloride is a high value-added chemical raw material, thus realizing comprehensive utilization of the wastewater.

Description

technical field [0001] The invention relates to the phosphorus chemical industry, in particular to the comprehensive utilization of sewage produced in the process of producing phosphate fertilizer by hydrochloric acid method. Background technique [0002] In the process of producing phosphate fertilizer by hydrochloric acid method, the output ratio of calcium hydrogen phosphate to 20% calcium chloride wastewater is 1:1. Due to the large output and low concentration of calcium chloride wastewater, similar devices in the same industry in China basically use concentration first and then drying, and finally Become a process of calcium chloride to solve the problem of wastewater pollution. However, the added value of calcium chloride is low, and the market demand is small. Most manufacturers solve the problem of excessive calcium chloride waste liquid by reducing the output of calcium hydrogen phosphate. This traditional production process ultimately limits the use of phosphate f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01C1/16
CPCC01C1/164C01P2006/80C02F1/04C02F1/56C02F9/00
Inventor 谢小刚张金刚
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD