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A method for producing wet-process phosphoric acid by leaching medium and low-grade phosphate rock with hydrochloric acid

A wet-process phosphoric acid, low-grade technology, applied in phosphoric acid, chemical instruments and methods, phosphorus oxyacids, etc., can solve the problems of insufficient comprehensive utilization of phosphoric acid preparation, high transportation cost, low grade of phosphate rock, etc., to reduce production risks. , The effect of protecting the ecological environment and simplifying the production process

Active Publication Date: 2019-12-17
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low-grade phosphate rock, high mining and transportation costs and insufficient comprehensive utilization of phosphoric acid in my country, and provide a method for producing wet-process phosphoric acid directly by leaching medium and low-grade phosphate rock with hydrochloric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] For a phosphate rock sample, the phosphorus element content is 5.02wt%, and the calcium element content is 20.31wt%. After the phosphate rock is ground and dried, pass through a 180-mesh sieve to obtain phosphate rock powder, and the sieve residue is required to be less than 5%. Weigh 40.00g of pretreated phosphate rock powder and evenly pack it into the leaching column. Slowly add 80mL of 30% hydrochloric acid solution to the immersion column, and after the phosphate rock powder is completely infiltrated, add 19.90mL of 50% concentrated sulfuric acid drop by drop. After reacting for 30 minutes, wash the column with deionized water, and mix the liquid obtained by washing with the reaction solution at the bottom of the column to obtain a leaching solution. The leaching solution was filtered, and the phosphorus content in the filtrate was measured by the quinolimonone gravimetric method, and the leaching rate of phosphorus was obtained to be 87.40%.

Embodiment 2

[0026] For a phosphate rock sample, the phosphorus element content is 10.01wt%, and the calcium element content is 28.88wt%. After the phosphate rock is ground and dried, pass through a 180-mesh sieve to obtain phosphate rock powder, and the sieve residue is required to be less than 5%. Weigh 40.00g of pretreated phosphate rock powder and evenly pack it into the leaching column. Slowly add 80mL of 30% hydrochloric acid solution into the leaching column. After the phosphate rock powder is completely infiltrated, add 9.6mL of concentrated sulfuric acid with a mass fraction of 98% drop by drop. After reacting for 30 minutes, collect the reaction solution at the bottom of the column to obtain the leaching solution. The phosphorous content in the filtrate was determined by the quinolyte gravimetric method, and the primary leaching rate of phosphorous was 52.79%.

Embodiment 3

[0028] For a phosphate rock sample, the phosphorus element content is 12.93wt%, and the calcium element content is 25.12wt%. After the phosphate rock is ground and dried, pass through a 180-mesh sieve to obtain phosphate rock powder, and the sieve residue is required to be less than 5%. Weigh 40.00g of pretreated phosphate rock powder, fill it evenly into the leaching column, add 210mL of hydrochloric acid solution with a mass fraction of 15% to it, and obtain a leachate after fully reacting, add 30mL of a mass fraction of 70% to the leachate % concentrated sulfuric acid, filter after fully reacting, and re-inject the filtrate into the leaching column to obtain the leaching solution again. Directly filter the leaching solution, inject the obtained filtrate into the leaching column again, and repeat the above operations in a cycle. The phosphogypsum obtained by filtering for many times is used to fill the hole bed layer in the leaching column due to the dissolution of phosphat...

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Abstract

The invention relates to a method for preparing wet-process phosphoric acid by using hydrochloric acid to infiltrate low-and-medium-grade phosphorite. The method includes: directly filling a jamb with low-and-medium-grade phosphorite which is not subjected to flotation; adopting hydrochloric acid infiltration to prepare wet-process phosphoric acid; enabling sulfuric acid to react with leachate to generate ardealite. The objective of directly filling or filling bed holes with ardealite by a pump can be achieved by adopting two different modes for adding sulfuric acid, so that the objectives of fixing mining layers and lowering risk of collapse of mining holes are achieved, and a series of environment problems caused by storage of ardealite are solved. The method has the advantages of mild reaction condition, high yield and high reaction speed, and a series of industrial processes like phosphorite exploitation, beneficiation, transportation and mine hole filling are omitted directly, so that production process is greatly simplified, emission of three wastes is avoided, one-time leaching efficiency of final phosphorus is up to 52.79%, and multiple leaching efficiency can reach higher than 85%.

Description

technical field [0001] The invention relates to the technical field of preparation of phosphoric acid and phosphate, in particular to a method for preparing wet-process phosphoric acid by directly leaching medium and low-grade phosphate rocks with hydrochloric acid. Background technique [0002] Phosphate rock is the basic raw material of phosphorus chemical industry, and it is an indispensable and non-renewable resource for the preparation of phosphoric acid and phosphate. Since the rich ore with a phosphorus content higher than 30% has almost been exploited, it has become an inevitable trend in the phosphorus chemical industry to develop low- and medium-grade phosphorus rocks with a phosphorus content of 5% to 20%. At present, the vast majority of domestic companies still use beneficiation methods to separate the P in low- and medium-grade phosphate rocks. 2 o 5 Production is carried out after enrichment, but a large amount of phosphorus resources are lost during the ben...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/22C01F11/46C01F11/24C01B25/32
CPCC01B25/2212C01B25/32C01F11/24C01F11/46
Inventor 王存文吴再坤黄在龙马家玉覃远航汪铁林周俊峰吕仁亮王为国陈苏芳冯魏良唐正姣张俊峰
Owner WUHAN INSTITUTE OF TECHNOLOGY
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