Method for producing calcium phosphate salts from hydrochloric acid and phosphate rock

A technology of calcium phosphate and calcium dihydrogen phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as affecting sustainable development, waste of resources, etc., to promote product production, save costs, and reduce prices. Effect

Inactive Publication Date: 2019-02-26
CHANHEN ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, most of the existing processes for producing calcium phosphate salt first convert the calcium in phosphate rock into phosphogypsum (calcium sulfate with high impurities) and remove it as industrial waste. The storage and digestion of phosphogypsum is a difficult point in this industry. It has affected the sustainable development of this industry, and in the process of subsequent production of calcium phosphate salt, it is necessary to add a large amount of calcium carbonate as a calcium source, resulting in a great waste of resources

Method used

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  • Method for producing calcium phosphate salts from hydrochloric acid and phosphate rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The main components of the phosphate rock used in this embodiment are shown in the following table 1, and the main components of the phosphoric acid adopted are shown in the following table 2:

[0056] Table 1

[0057] raw material name

P 2 o 5 %

MgO%

CaO%

Fe 2 o 3 %

al 2 o 3 %

Medium grade phosphate rock

26.32

1.78

40.98

1.73

1.53

[0058] Table 2

[0059] raw material name

P 2 o 5 %

CaO%

MgO%

Fe 2 o 3 %

Al 2 o 3 %

concentrated phosphoric acid

54.88

not detected

2.35

0.30

0.20

[0060] A. Mix medium-grade phosphate rock with 21% hydrochloric acid at a molar ratio of CaO:HCl=1:2.1, then weigh 5000g of medium-grade ore, 13221g of 21% hydrochloric acid, and carry out acid hydrolysis for 1 hour at 35°C. The slurry is filtered and washed three times with 1500g of clear water to obtain the filtrate and filter residue; after testing, the m...

Embodiment 2

[0067] The main components of the phosphate rock adopted in this embodiment are shown in the following table 4, and the main components of the phosphoric acid adopted are shown in the following table 5:

[0068] Table 4

[0069] raw material name

P 2 o 5 %

MgO%

CaO%

Fe 2 o 3 %

Al 2 o 3 %

Phosphate concentrate

31.96

0.62

46.42

0.88

0.81

[0070] table 5

[0071] raw material name

P 2 o 5 %

CaO%

MgO%

Fe 2 o 3 %

al 2 o 3 %

wet process phosphoric acid

42.16

0.10

2.09

0.44

0.37

[0072] A. Mix phosphor concentrate and hydrochloric acid with a mass concentration of 30% at a molar ratio of CaO:HCl=1:1.8, then weigh 5000g of phosphor concentrate, 9077g of 30% hydrochloric acid, and carry out acid hydrolysis reaction at 60°C for 0.5h. The slurry is filtered and washed three times with 1500g of clear water to obtain the filtrate and filter residue; af...

Embodiment 3

[0079] The main components of the phosphate rock used in this embodiment are shown in the following table 7, and the main components of the phosphoric acid used are shown in the following table 8:

[0080] Table 7

[0081] raw material name

P 2 o 5 %

MgO%

CaO%

Fe 2 o 3 %

Al 2 o 3 %

Medium grade phosphate rock

26.32

1.78

40.98

1.73

1.53

[0082] Table 8

[0083] raw material name

P 2 o 5 %

CaO%

MgO%

Fe 2 o 3 %

al 2 o 3 %

wet process phosphoric acid

42.16

0.10

2.09

0.44

0.37

[0084] A. Mix medium-grade phosphate rock with 25% hydrochloric acid at a molar ratio of CaO:HCl=1:2.3, then weigh 500g of medium-grade phosphate rock, 1216g of 25% hydrochloric acid, and carry out acid hydrolysis reaction at 40°C for 0.5 h, the slurry is filtered and washed three times with 150g of clear water to obtain filtrate and filter residue; after testing, the ma...

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Abstract

The invention specifically relates to a method for producing calcium phosphate salts from hydrochloric acid and phosphate rock, belonging to the technical fields of feeds and fertilizers. To overcometechnical problems in the prior art, the invention provides the method for producing calcium phosphate salts. The method comprises the following steps: A, reacting hydrochloric acid with phosphate rock, and carrying out filtering to obtain filter residues and a filtrate; B, mixing the filtrate with phosphoric acid to obtain refined slurry; and C, subjecting the refined slurry to dechlorination, defluorination and dehydration by heating so as to obtain the calcium phosphate salts. The method of the invention uses phosphate rock, especially medium-and-low-grade phosphate rock, as a raw material,is simple in steps and low in cost, and can prepare different kinds of calcium phosphate salts by adjusting the amount of phosphoric acid; and the obtained calcium phosphate salts have excellent quality and fully meet national standards in China.

Description

technical field [0001] The invention belongs to the technical field of feed and fertilizer, and in particular relates to a method for producing calcium phosphate by using hydrochloric acid and phosphate rock, especially medium and low-grade phosphate rock. Background technique [0002] Calcium phosphate can be used as fertilizer grade calcium phosphate, widely used in agricultural production, mainly used as raw material for compound fertilizer, and can also be directly applied to farmland; calcium phosphate can be used as feed grade calcium phosphate, suitable for Animals such as livestock, poultry, and aquatic products are feed additives used to supplement the calcium and phosphorus nutrition of livestock, poultry, and aquatic animals. [0003] It is generally believed in the industry that P 2 o 5 24%-28% is medium-grade phosphate rock, and 18%-24% is low-grade phosphate rock. China is relatively rich in phosphate rock resources, and the total amount of proven resources ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
CPCC01B25/32C01P2006/80C01P2006/82
Inventor 李进王佳才邹建吴生平侯隽黄恒张希阳
Owner CHANHEN ECO TECH CO LTD
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