Decomposition method of phosphate rock

A technology of phosphate rock and phosphoric acid, applied in chemical instruments and methods, phosphoric acid, phosphorus oxyacid, etc., can solve the problems of low phosphorus yield, etc., to improve phosphorus recovery rate, improve decomposition rate and phosphorus recovery rate, improve The effect of production efficiency

Active Publication Date: 2019-08-13
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a method for decomposing phosphate rock to solve the problem of low phosphorus yield in the wet process phosphoric acid process in the prior art

Method used

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  • Decomposition method of phosphate rock
  • Decomposition method of phosphate rock
  • Decomposition method of phosphate rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Taking 100g of phosphate rock as raw material, adopting a mass concentration of 15% phosphoric acid solution (in terms of P 2 o 5 ) and a mixed solution of hydrochloric acid with a molar concentration of 10% (in terms of moles of anions) to leach the phosphate rock, control the liquid-solid ratio of the system to 10:1, react at 30°C for 5 hours, and obtain the leachate and Leach residue.

[0039] The leaching solution is extracted with 90wt% sulfuric acid to obtain phosphogypsum and phosphoric acid solution. Wherein, the extraction temperature is 30° C., the extraction time is 6 h, and the amount of sulfuric acid is 95% of the stoichiometric amount.

Embodiment 2 to Embodiment 21 and comparative example 1

[0041] Example 2 to Example 21 and Comparative Example 1 were decomposed according to the decomposition conditions shown in Table 1, using the same steps as in Example 1 to decompose phosphate rock.

[0042] Table 1:

[0043]

[0044]

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Abstract

The invention provides a phosphorite decomposition method which comprises the following steps: S1, leaching out phosphorite by using a mixed solution of phosphoric acid and a solutizer so as to obtain a lixivium and leaching residues; and S2, extracting the lixivium by using sulfuric acid, thereby obtaining ardealite and a phosphoric acid solution. As the phosphorite is decomposed by using the mixed solution of the phosphoric acid and the solutizer, not only are the decomposition ate of phosphorite and the recycling rate of phosphorus increased, but also the amount of the mixed solution for leaching out the phosphorite is reduced, that is, the phosphorus recycling rate is increased on premise that a liquid-solid ratio is reduced. Correspondingly, the amount of the mixed solution is reduced, the liquid-solid ratio of gypsum to extraction residue pulp after the extraction step is reduced, furthermore the treatment amount of the pulp is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of wet-process phosphoric acid production, in particular to a method for decomposing phosphate rock. Background technique [0002] The total amount of phosphate rock resources in my country is very rich, but the rich ore resources are poor (accounting for less than 10% of the total resources), and the P in the ore 2 o 5 The average grade is only 16.85%, and most of them are colphosite with high impurity content (mainly magnesium and sesquioxide Fe 2 o 3 、Al 2 o 3 ), leading to the difficulty of phosphorus mining and high enrichment costs. Efficient and comprehensive utilization of my country's rich low-grade phosphate rock resources will become the main development trend of my country's phosphorus chemical industry in the future. [0003] The wet process phosphoric acid process is one of the main methods for producing phosphoric acid at present. Among them, the dihydric process has strong adaptability to phosph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/22C01B25/46
CPCC01B25/2208C01B25/46
Inventor 王良士赵龙胜黄小卫巫圣喜徐旸冯宗玉帅庚洪崔大立
Owner GRIREM ADVANCED MATERIALS CO LTD
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