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Utilization method of phosphate ores

A technology of phosphate rock and phosphate rock, applied in chemical instruments and methods, phosphoric acid, phosphorus compounds, etc., can solve the problem of high acid hydrolysis cost, and achieve the effect of low acid hydrolysis cost, lower viscosity and good toughness

Inactive Publication Date: 2016-06-22
GUIZHOU INST OF METALLURGY & CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when hydrochloric acid decomposes phosphate rock, hydrochloric acid is a consumable product, which makes the cost of acid hydrolysis higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for utilizing phosphate rock, comprising the following steps:

[0024] 1. The phosphate rock powder obtained after pulverizing and finely grinding the phosphate rock and hydrochloric acid is stirred and reacted at room temperature for 3 hours, and then the solid and liquid are separated to obtain solution A containing phosphoric acid and calcium chloride; the phosphate rock is phosphorus Concentrate, the particle size of the phosphate rock powder after grinding is less than 40 mesh, the concentration of hydrochloric acid is 25wt%, and the amount added is 2.5 times the mass of the phosphate rock powder;

[0025] 2. Add a defluorinating agent to solution A, stir while adding, continue stirring for 1.5h after the addition, let stand, and separate solid and liquid to obtain solution B; the defluorinating agent is composed of 10g of active silicon dioxide and sodium chloride 60g mixed; the amount of fluorine removal agent added is twice the molar amount of fluorine ...

Embodiment 2

[0032] A method for utilizing phosphate rock, comprising the following steps:

[0033] 1. The phosphate rock powder obtained by pulverizing and grinding the phosphate rock and hydrochloric acid was stirred and reacted at room temperature for 6 hours, and then separated from the solid and liquid to obtain solution A containing phosphoric acid and calcium chloride; the phosphate rock was phosphorus Concentrate, the particle size of the phosphate rock powder after grinding is less than 40 mesh, the concentration of hydrochloric acid is 37wt%, and the amount added is 4 times the mass of the phosphate rock powder;

[0034] 2. Add a defluorinating agent to solution A, stir while adding, continue stirring for 1.5h after the addition, let stand, and separate solid and liquid to obtain solution B; the defluorinating agent is composed of 10g of active silicon dioxide and sodium chloride 60g mixed; the amount of fluorine removal agent added is twice the molar amount of fluorine contained...

Embodiment 3

[0041] A method for utilizing phosphate rock, comprising the following steps:

[0042] 1. The phosphate rock powder obtained after pulverizing and grinding the phosphate rock and hydrochloric acid is stirred and reacted at room temperature for 0.5h, and then the solid and liquid are separated to obtain solution A containing phosphoric acid and calcium chloride; the phosphate rock is Phosphate concentrate, the particle size of the phosphate rock powder after grinding is less than 40 mesh, the concentration of hydrochloric acid is 15wt%, and the amount added is 1.5 times the mass of the phosphate rock powder;

[0043] 2. Add a defluorinating agent to solution A, stir while adding, continue to stir for 0.5h after adding, let stand, and separate the solid and liquid to obtain solution B; the defluorinating agent is composed of 5g of active silicon dioxide and sodium chloride 40g mixed; the amount of fluorine removal agent added is 1 times the molar amount of fluorine contained in ...

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PUM

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Abstract

The invention discloses a utilization method of phosphate ores. The utilization method comprises the following steps: crushing and finely grinding the phosphate ores to obtain phosphate ore powder; stirring the phosphate ore powder and hydrochloric acid to react at a room temperature for 0.5 hour to 6 hours; carrying out solid-liquid separation; carrying out fluorine removal, impurity removal, calcium-phosphorus separation (sedimentation, filtering, extracting, drying and the like) on a liquid solution; furthermore, treating a residual calcium chloride solution; finally, obtaining products including fertilizer-grade calcium hydrogen phosphate, feed-grade calcium hydrogen phosphate, phosphorus-nitrogen composite flame retardant, tricalcium phosphate, calcium sulfate whiskers and the like, and also obtaining a diluted hydrochloric acid solution; rectifying and concentrating the diluted hydrochloric acid solution and returning the solution back to a phosphate ore powder acidolysis procedure. According to the utilization method, the used hydrochloric acid can be circularly utilized, and the hydrochloric acid can be generated; the obtained hydrochloric acid is used for decomposing the phosphate ores again and the acidolysis cost is low; meanwhile, the phosphorus chemical products including the fertilizer-grade calcium hydrogen phosphate, the feed-grade calcium hydrogen phosphate, the phosphorus-nitrogen composite flame retardant, the tricalcium phosphate, the calcium sulfate whiskers and the like can also be obtained, so that the comprehensive utilization efficiency of the phosphate ores is high and the economic benefits are good.

Description

technical field [0001] The invention relates to a utilization method of phosphate rock, in particular to a utilization method of phosphate rock recycled by hydrochloric acid. Background technique [0002] The products of the reaction of hydrochloric acid and phosphate rock are highly water-soluble phosphoric acid and calcium chloride. The difference from the sulfuric acid method is that there will be no passivation caused by calcium sulfate covering the undecomposed phosphate rock powder, so there is no need for grinding It can reduce the energy consumption of the process; hydrochloric acid has a strong ability to decompose phosphate rock, and has a high phosphorus dissolution rate for general medium and low-grade massive phosphate rock. Hydrochloric acid decomposition of phosphate rock also has rapid response and high decomposition rate. , All kinds of mines are applicable and so on. Therefore, it is of great significance to the sustainable utilization of phosphorus resour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C01F11/46C01B25/22C01B25/46C09K21/04
CPCC01B25/2212C01B25/32C01B25/462C01B25/464C01B25/465C01F11/46C09K21/04
Inventor 聂登攀王振杰刘安荣薛安
Owner GUIZHOU INST OF METALLURGY & CHEM ENG
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