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The preparation method of calcium dihydrogen phosphate

A technology of calcium dihydrogen phosphate and phosphoric acid, applied in chemical instruments and methods, fluorosilicic acid, calcium fertilizers, etc., can solve the problems of low utilization efficiency of raffinate acid and great soil damage, and improve the dissolution rate of phosphate rock. , The effect of saving sulfuric acid and phosphorus yield improvement

Active Publication Date: 2020-04-10
SINOCHEM YUNLONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of calcium dihydrogen phosphate, which solves the problem that the utilization efficiency of raffinate acid is not high in the prior art, and the use of by-product waste residue as fertilizer is harmful to the soil

Method used

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  • The preparation method of calcium dihydrogen phosphate

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Effect test

Embodiment 1

[0036] A preparation method of calcium dihydrogen phosphate, comprising:

[0037] Step 1: Use raffinate to react with the thick slurry returned in step 3, separate the phosphogypsum produced, and obtain clear liquid-1, the ratio of the dry weight of phosphogypsum to the phosphate rock consumed in step 2 is 0.5:1, and the P in phosphogypsum 2 o 5 Quality fraction 1.0%;

[0038] Step 2: Mix clear liquid-1 obtained in step 1, phosphate rock, and phosphoric acid obtained in step 9 in a mass ratio of 1:1:10, the reaction time is 30 minutes, and the reaction temperature is 90°C;

[0039] Step 3: Thicken the slurry in step 2 with a thickener to obtain the clear liquid-2 and the bottom dense slurry, and return the thick slurry to step 1 for use;

[0040] Step 4: The supernatant-2 is separated and purified through the nanofiltration membrane to obtain phosphoric acid separation and purification, and the supernatant-3 with a low mass fraction of cations is obtained and sent to step 9,...

Embodiment 2

[0049] A preparation method of calcium dihydrogen phosphate, comprising:

[0050] Step 1: Use raffinate to react with the thick slurry returned in step 3, separate the phosphogypsum produced, and obtain clear liquid-1. The ratio of the dry weight of phosphogypsum to the phosphate rock consumed in step 2 is 0.6:1, and the P in phosphogypsum 2 o 5 Mass fraction 0.75%;

[0051] Step 2: Mix clear liquid-1 obtained in step 1, phosphate rock, and phosphoric acid obtained in step 9 in a mass ratio of 10:1:5, the reaction time is 60 minutes, and the reaction temperature is 80°C;

[0052] Step 3: Thicken the slurry in step 2 with a thickener to obtain the clear liquid-2 and the bottom dense slurry, and return the thick slurry to step 1 for use;

[0053] Step 4: The supernatant-2 is separated and purified through the nanofiltration membrane to obtain phosphoric acid separation and purification, and the supernatant-3 with a low mass fraction of cations is obtained and sent to step 9, a...

Embodiment 3

[0062] A preparation method of calcium dihydrogen phosphate, comprising:

[0063] Step 1: Use raffinate to react with the thick slurry returned in step 3, separate the phosphogypsum produced, and obtain clear liquid-1, the ratio of the dry weight of phosphogypsum to the phosphate rock consumed in step 2 is 0.8:1, and the P in phosphogypsum 2 o 5 Quality fraction 0.65%;

[0064] Step 2: Mix clear liquid-1 obtained in step 1, phosphate rock, and phosphoric acid obtained in step 9 in a mass ratio of 15:1:3, the reaction time is 90 minutes, and the reaction temperature is 80°C;

[0065] Step 3: Thicken the slurry in step 2 with a thickener to obtain the clear liquid-2 and the bottom dense slurry, and return the thick slurry to step 1 for use;

[0066] Step 4: The supernatant-2 is separated and purified through the nanofiltration membrane to obtain phosphoric acid separation and purification, and the supernatant-3 with a low mass fraction of cations is obtained and sent to step 9...

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Abstract

The invention discloses a preparation method of monocalcium phosphate. The method comprises the following steps of enabling phosphorus ore to be subjected to fractional decomposition by utilizing organically extracted purification raffinate acid and membrane filtration purification strong phosphoric acid, enabling non-soluble calcium in the phosphorus ore to convert into water-soluble calcium, andobtaining an MCP (monocalcium phosphate) product after membrane filtration purification, neutralization purification impurity removal and strong acid antiregulation. The problems in the prior art that the utilization efficiency of the raffinate acid is not high, byproduct waste residue causes great harm to soil when used as fertilizer and the utilization rate of a calcium fluoride source in the phosphorus ore is low are solved; the efficient recycle of the raffinate acid and the calcium fluoride source in the phosphorus ore is realized, the raffinate acid and the calcium fluoride source are used for producing feed-grade monocalcium phosphate and villiaumite products, the resource utilization rate is improved, the discharge of ardealite is substantially reduced, and the economical and environmental protection pressure of enterprises is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a preparation method of calcium dihydrogen phosphate. Background technique [0002] In recent years, with the maturity of wet-process phosphoric acid purification technology, wet-process phosphoric acid can be used to produce industrial-grade or even food-grade phosphate products, and its production cost is significantly lower than that of thermal phosphoric acid production. Phosphate products are becoming increasingly competitive in the market. [0003] At present, organic solvent extraction is mostly used for wet-process phosphoric acid purification. This process can obtain high-quality purified phosphoric acid, and the yield is generally about 50%. Phosphate fertilizer for agriculture. However, as the safety of chemical fertilizer application has attracted more and more people's attention, raffinate with high impurity mass fraction is used to produce fertilizer p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C05G1/00C01B33/10
CPCC01B25/32C01B33/103C05B17/00C05D3/02C05D5/00C05D9/02
Inventor 盛勇付全军周佩陈伟刘雪洁吴世琴
Owner SINOCHEM YUNLONG
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