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Technology for removing impurities in dicalcium phosphate

A calcium hydrogen phosphate and impurity technology, applied in phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of reduced efficiency, increased removal of impurities, health hazards, etc., and achieves low cost, simple process, and reduced impurity content. Effect

Inactive Publication Date: 2016-11-16
LUFENG TIANBAO PHOSPHORUS CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method for removing impurities in feed calcium hydrogen phosphate enterprises is to use sodium sulfide, calcium, carbonate, etc. to carry out one-stage or two-stage neutralization slurry for wet-process phosphoric acid to remove impurities. During the process, the waste gas generated, It will cause different degrees of harm to the surrounding environment and the health of the operators on the post, and the more impurities are added, the more reagents to remove impurities will be added, which will increase the cost of the enterprise, and increasing the steps to remove impurities in the process will also increase production costs and reduce efficiency. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step A pulp production: crush the phosphate rock in a crusher, and make pulp through a ball mill to obtain a phosphate rock pulp;

[0019] Step B acidolysis reaction: Add sulfuric acid to the phosphate rock slurry in the extraction tank, filter through a filter after sufficient reaction to obtain phosphogypsum and filtrate, discharge the filtrate into the phosphoric acid sedimentation tank, and add a certain amount of coagulation sedimentation agent to obtain phosphoric acid solution 1;

[0020] Step C Crystallization and impurity removal: pass phosphoric acid solution 1 through a trapezoidal tank with a cross-sectional height of 30 cm, an upper bottom of 40 cm without sealing, a lower bottom of 20 cm, and a tank length of 120 meters. The tank is made of steel and cement, and the surface is placed on One layer of phosphogypsum solid in step B, make the surface as rough as possible, make the solution flow slowly in the tank, measure the temperature of the solution at 35 ...

Embodiment 2

[0026] Step A pulp production: crush the phosphate rock in a crusher, and make pulp through a ball mill to obtain a phosphate rock pulp;

[0027] Step B acidolysis reaction: Add sulfuric acid to the phosphate rock slurry in the extraction tank, filter through a filter after sufficient reaction to obtain phosphogypsum and filtrate, discharge the filtrate into the phosphoric acid sedimentation tank, and add a certain amount of coagulation sedimentation agent to obtain phosphoric acid solution 1;

[0028] Step C Crystallization and impurity removal: pass phosphoric acid solution 1 through a trapezoidal tank with a cross-sectional height of 30 cm, an upper bottom of 40 cm without sealing, a lower bottom of 20 cm, and a tank length of 135 meters. The tank is made of steel and cement, and the surface is placed on One layer of phosphogypsum solid in step B, make the surface as rough as possible, make the solution flow slowly in the tank, measure the temperature of the solution at 20 ...

Embodiment 3

[0034] Step A pulp production: crush the phosphate rock in a crusher, and make pulp through a ball mill to obtain a phosphate rock pulp;

[0035] Step B acidolysis reaction: Add sulfuric acid to the phosphate rock slurry in the extraction tank, filter through a filter after sufficient reaction to obtain phosphogypsum and filtrate, discharge the filtrate into the phosphoric acid sedimentation tank, and add a certain amount of coagulation sedimentation agent to obtain phosphoric acid solution 1;

[0036] Step C Crystallization and impurity removal: pass phosphoric acid solution 1 through a trapezoidal tank, the cross-section height of the trapezoidal tank is 30cm, the upper bottom is 40cm unsealed, the lower bottom is 20cm, the length of the tank is 150 meters, the tank is made of steel and cement, and the surface is placed on One layer of phosphogypsum solid in step B, make the surface as rough as possible, make the solution flow slowly in the tank, measure the temperature of t...

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PUM

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Abstract

The invention discloses a process for removing impurities in calcium hydrogen phosphate, which is characterized in that: it consists of the following steps: preparation of ore pulp, acidolysis reaction, crystallization to remove impurities, one-stage neutralization, crystallization to remove impurities, second-stage neutralization, and three-stage One-stage neutralization, which is characterized in that under the condition of controlling the reaction pH, the process of crystallization and impurity removal is added before the process of one-stage neutralization and two-stage neutralization, so that the impurities existing in the liquid gradually form crystals during the flow process Reduce impurities.

Description

technical field [0001] The invention belongs to the field of removing impurities from phosphate rock, and in particular relates to a process for removing impurities in calcium hydrogen phosphate. Background technique [0002] In the process of producing feed-grade calcium hydrogen phosphate with sulfuric acid and phosphate rock as raw materials, a certain amount of impurities such as arsenic, fluorine, lead, and cadmium are brought in from the phosphate rock, so that the impurities in the calcium hydrogen phosphate product exceed the product limit. standard requirement. [0003] At present, the method for removing impurities in feed calcium hydrogen phosphate enterprises is to use sodium sulfide, calcium, carbonate, etc. to carry out one-stage or two-stage neutralization slurry for wet-process phosphoric acid to remove impurities. During the process, the waste gas generated, It will cause different degrees of harm to the surrounding environment and the health of the operato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
CPCC01B25/322C01P2006/80
Inventor 粟宇周荣超周荣敏彭启明
Owner LUFENG TIANBAO PHOSPHORUS CHEM CO LTD
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