New production technology of feed grade calcium hydrogen phosphate

A calcium hydrogen phosphate, feed-grade technology, applied in the direction of calcium carbonate/strontium/barium, phosphorus compounds, inorganic chemistry, etc., can solve the problems of unstable product quality, environmental pollution, high production cost, easy to control the production process, phosphorus The effect of high recovery rate and low equipment investment

Inactive Publication Date: 2005-03-09
贾振宇
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Problems solved by technology

A large amount of sewage is discharged during the production process, causing environmental pollution
During the defluoridation process, a large amount of filter residue is discharged, resulting in a large loss of phosphorus, and the recovery rate of phosphorus is generally about 70%.
Low degree of production automation, difficult process control, unstable product quality, high production cost

Method used

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  • New production technology of feed grade calcium hydrogen phosphate

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Embodiment Construction

[0013] In the present invention, calcium carbonate slurry is fully contacted and reacted with wet-process phosphoric acid directly in a high-speed spiral reactor, and stirring and material transportation are carried out through a high-speed spiral to solve the problem of foam generation. Then carry out the curing reaction on the chemical synthesis belt to achieve the complete reaction of phosphoric acid and calcium carbonate to generate calcium hydrogen phosphate. This process solves the problems of large amount of sewage discharge and low phosphorus recovery rate produced by the neutralization precipitation reaction with lime milk. The phosphorus recovery rate in the whole production process can reach 98%, which greatly reduces the production cost. In the production operation, the degree of automation is high, the reaction process can be automatically controlled by computer, the process control is simple, and the problem of difficult operation of the wet process is solved. In...

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Abstract

A process for preparing the feed-class calcium hydrogen phosphate includes reaction between calcium carbonate slurry and wet phosphoric acid in high-speed spiral reactor, solidifying reaction by chemically synthetic belt, breaking, drying, and pulverizing. It has high P recovering rate 98%.

Description

technical field [0001] The invention belongs to a new production process of feed grade calcium hydrogen phosphate. Background technique [0002] Calcium hydrogen phosphate is an important mineral feed. The existing production process of feed grade calcium hydrogen phosphate, often called wet process, is to decompose phosphate rock powder with sulfuric acid or hydrochloric acid to produce dilute phosphoric acid, then neutralize phosphoric acid with milk of lime to a pH value of about 3.8, and the reaction temperature is 45 °C, calcium hydrogen phosphate precipitates are formed, and then filtered and dried to obtain the product feed grade phosphate. This is the so-called wet process. This technological process is long, and equipment is many, and investment is big. A large amount of sewage is discharged during the production process, causing environmental pollution. During the defluoridation process, a large amount of filter residue is discharged, resulting in a large loss ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C01B25/32C01F11/18
Inventor贾振宇陈朴张翠荣
Owner贾振宇