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High-magnesium phosphate tailing enrichment and light calcium carbonate and magnesium hydroxide co-production method

A technology of light calcium carbonate and high-magnesium phosphorus tailings, which is applied in the treatment of phosphorus tailings, the treatment of high-magnesium phosphorus tailings and medium and low-grade phosphate rocks, the enrichment of high-magnesium phosphorus tailings and the co-production of magnesium hydroxide And food-grade light calcium carbonate field, to achieve the effect of good environmental benefits

Inactive Publication Date: 2019-02-19
HUNAN CHEM VOCATIONAL TECH COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose a new phosphorous tailings processing technology method for the problems existing in the existing phosphorous tailings processing technology, and this new phosphorous tailings processing technology method can co-produce high Purity Magnesium Hydroxide, Food Grade Light Calcium Carbonate and P 2 o 5 Phosphorus concentrate powder with a content of more than 30% makes the processed light calcium carbonate meet the standard of food-grade light calcium carbonate (HG / T2226-2010)

Method used

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  • High-magnesium phosphate tailing enrichment and light calcium carbonate and magnesium hydroxide co-production method
  • High-magnesium phosphate tailing enrichment and light calcium carbonate and magnesium hydroxide co-production method
  • High-magnesium phosphate tailing enrichment and light calcium carbonate and magnesium hydroxide co-production method

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Embodiment 1

[0048] First, phosphate tailings are calcined at a temperature of 950-1000°C to form phosphate rock powder; the amount of phosphate rock powder in the leaching kettle is 5kg, and the amount of water added is 50L. After fully stirring, the pH value of the solution is about 10.5, and the heat of digestion The water temperature is 60°C, and the time is 1-2 hours; after hot water digestion, the secondary ammonium salt leaching is carried out; the feeding material for the first stage leaching ammonium chloride is 5 kg, the reaction time is 2 hours, and the second stage leaching of chlorine Feed 3kg of ammonium chloride, and the leaching time is also 2h. After the secondary leaching reaction, the two leaching solutions are combined to form a mixed leaching solution; the pH value of the mixed leaching solution is about 8.5. Then flush the mixed leaching solution into CO 2 Carry out carbonization reaction; CO in the carbonation reaction of mixed leaching solution 2 The concentration ...

Embodiment 2

[0054] First, the phosphorous tailings are calcined at a temperature of 950-1000°C to form phosphate rock powder; the amount of phosphate rock powder in the leaching kettle is 5kg, and the ammonium chloride mother liquor is recycled; after being digested by hot water at a temperature of 80°C, Carry out the secondary ammonium salt leaching, the temperature of the digested hot water is 80°C; add 0.5 kg of ammonium chloride during the first stage leaching, after fully stirring, the pH value of the solution is about 10.5, and the reaction time is 2 hours; Add 1 kg of ammonium chloride, and the leaching time is also 2 hours. After the secondary leaching reaction, the two leaching solutions are combined to form a mixed leaching solution; the pH value of the mixed leaching solution is about 8.8. Then flush the mixed leaching solution into CO 2 Carry out carbonization reaction; CO in the carbonation reaction of leaching solution 2 The concentration is 60%, the reaction temperature is...

Embodiment 3

[0058] First, the phosphorous tailings are calcined at a temperature of 950-1000°C to form phosphate rock powder; the amount of phosphate rock powder in the leaching kettle is 5kg, and the ammonium chloride mother liquor is recycled; after being digested by hot water at a temperature of 80°C, Add ammonium chloride 1.0kg during the first stage leaching. After fully stirring, the pH value of the solution is about 10.4, and the reaction time is 2h; After the extraction reaction is completed, the two leaching solutions are combined to form a mixed leaching solution; the pH value of the mixed leaching solution is about 8.5. Then flush the mixed leaching solution into CO 2 Carry out carbonization reaction; CO in the carbonation reaction of leaching solution 2 The concentration is 30%, the reaction temperature is controlled at 20-30°C, the carbonization reaction time is 60min, and the pH value at the end of the reaction is 7.5. The composition of the obtained phosphorus concentrate...

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Abstract

The invention discloses a method for co-producing magnesium hydroxide and light calcium carbonate by magnesium-rich phosphate tailing. High-magnesium phosphate tailings are calcined to form calcined phosphate tailing powder, the calcined phosphate tailing powder serves as a raw material, calcium hydroxide is sufficiently separated by hot water digestion reaction and secondary ammonium salt leaching, the light calcium carbonate is prepared by leaching liquid carbonization, and filter residues are carbonized to separate the magnesium hydroxide. The high-purity magnesium hydroxide, the food-gradelight calcium carbonate and phosphate concentrate powder with P2O5 content reaching 30% or more are co-produced by process steps such as calcination, digestion, secondary leaching, leaching liquid carbonization, leaching filter residue carbonization and ammoniation of the high-magnesium phosphate tailings. The method can enrich low-grade phosphate tailing powder into the high-grade phosphate concentrate powder, the high value added magnesium hydroxide and the food-grade light calcium carbonate are prepared, the production process is not complicated, 'waste control by waste' can be realized, the recycling economy target of turning 'waste' into resources can be achieved, and the method has good environmental benefits and social benefits.

Description

technical field [0001] The invention relates to a method for treating phosphorus tailings, in particular to a method for enriching high-magnesium phosphorus tailings and co-producing magnesium hydroxide and food-grade light calcium carbonate, mainly used for treating high-magnesium phosphorus tailings and Treatment of low and medium grade phosphate rock. The invention belongs to the technical field of tailings environmental comprehensive treatment. Background technique: [0002] my country's phosphate rock reserves rank second in the world, but 80% of the reserves are low- and medium-grade phosphate rocks, most of which are difficult-to-select low- and medium-grade collophosphine. The widespread use of rich mining methods makes P 2 o 5 Rich ores with a mass fraction above 30% are rapidly depleted. At present, in order to realize the comprehensive utilization of phosphate rock resources and the sustainable development of China's phosphorus chemical industry, it is imperati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01F11/18C01F5/20C01F5/16
CPCC01B25/01C01F5/16C01F5/20C01F11/181C01P2006/80
Inventor 颜鑫
Owner HUNAN CHEM VOCATIONAL TECH COLLEGE
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