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Technology for enriching phosphate concentrate and recycling calcium carbonate and magnesium hydroxide from middle-low grade phosphate rock or phosphate tailing simultaneously

A magnesium hydroxide, low-grade technology, applied in magnesium hydroxide, calcium carbonate/strontium/barium, phosphate material processing and other directions, can solve the problems of difficult separation and control, difficult to elute chloride ions, poor separation effect, etc. , to solve the problem of low phosphorus recovery rate and good separation effect

Active Publication Date: 2019-01-25
贵州盛源新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its separation control is very difficult, the separation effect is poor, and it is difficult to completely separate calcium and magnesium. The purity of the obtained calcium carbonate and magnesium hydroxide is low, and the chloride ions are difficult to elute

Method used

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  • Technology for enriching phosphate concentrate and recycling calcium carbonate and magnesium hydroxide from middle-low grade phosphate rock or phosphate tailing simultaneously
  • Technology for enriching phosphate concentrate and recycling calcium carbonate and magnesium hydroxide from middle-low grade phosphate rock or phosphate tailing simultaneously

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Calcining 100g of medium and low-grade phosphate rock at 700-1200°C for 1.5h to obtain calcined slag and carbon dioxide;

[0054] (2) Calcined slag and 400ml of 20% ammonium nitrate solution are added to the reaction tank, stirred and reacted at a speed of 400r / min, the reaction temperature is 25°C, and the reaction time is 60min to generate ammonia gas, which is separated by filtration to obtain leach solution A and leach residue a;

[0055] (3) Pass sufficient amount of NH produced in steps (1) and (4) into the leach solution A 3 Gas and step (1) produced a concentration of 25% CO 2 , stirring and reacting according to the speed of 200r / min, the reaction temperature is 50°C, the reaction time is 60min, filtering and separating to obtain leaching solution B and leaching residue b, wherein leaching solution B is ammonium nitrate solution; drying the leaching residue b to obtain a calcium carbonate product;

[0056] (4) Add leaching slag a and 400ml of 20% ammonium...

Embodiment 2

[0060] (1) Calcining 100g of medium and low-grade phosphate rock at 700-1200°C for 1 hour to obtain calcined slag and carbon dioxide;

[0061] (2) Calcined slag and 200ml of 50% ammonium nitrate solution are added to the reaction tank, stirred and reacted at a speed of 700r / min, the reaction temperature is 45°C, and the reaction time is 30min to generate ammonia gas, which is separated by filtration to obtain leach solution A and leach residue a;

[0062] (3) In the leaching solution A, a sufficient amount of NH produced in steps (1) and or (4) steps is introduced 3 Gas and step (1) produced a concentration of 30% CO 2 , stirring and reacting according to the speed of 500r / min, the reaction temperature is 80°C, the reaction time is 30min, filtering and separating to obtain leaching solution B and leaching residue b, wherein leaching solution B is ammonium nitrate solution; drying the leaching residue b to obtain a calcium carbonate product;

[0063] (4) Add leaching residue ...

Embodiment 3

[0067] (1) Calcining 100g of medium and low-grade phosphate rock at 700-1200°C for 2 hours to obtain calcined slag and carbon dioxide;

[0068] (2) Calcined slag and 1500ml of 5% ammonium nitrate solution are added in the reaction tank, stirred and reacted according to the speed of 200r / min, the reaction temperature is 10°C, the reaction time is 120min, ammonia gas is generated, and the leaching solution A and leaching solution are obtained through filtration and separation. Slag a;

[0069] (3) Pass sufficient amount of NH produced in steps (1) and (4) into the leach solution A 3 Gas and step (1) produced a concentration of 15% CO 2 , stirring and reacting according to the speed of 50r / min, the reaction temperature is 30°C, and the reaction time is 120min, filtering and separating to obtain leaching solution B and leaching residue b, wherein leaching solution B is ammonium nitrate solution; drying the leaching residue b to obtain a calcium carbonate product;

[0070](4) Add...

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Abstract

The invention relates to the technical field of inorganic chemical industry and specifically relates to a technology for enriching phosphate concentrate and recycling calcium carbonate and magnesium hydroxide from middle-low grade phosphate rock or phosphate tailing simultaneously. According to the technology disclosed by the invention, middle-low grade phosphate rock or phosphate tailing is utilized as a main raw material to enrich phosphate concentrate and recycle calcium carbonate and magnesium hydroxide simultaneously, so that the problems that an existing twice reverse-flotation phosphateconcentrate enriching technology for phosphate is low in phosphorus recovery rate and discharges a lot of tailing to bring environment-friendly risk. Phosphate or phosphate tailing is roasted at thetemperature of 700 to 1200 DEG C, so that calcite and dolomite are decomposed, and contained fluorapatite (Ca5F(PO4)3) is not decomposed; by means of twice ammonium nitrate leaching, phosphate concentrate, high-quality light calcium carbonate and high-purity magnesium hydroxide can be finally obtained; calcium and magnesium can be effectively recycled, and a good economic benefit is achieved; meanwhile, the method can prevent new tailing from generating, and the problems of a lot of land occupancy, environment pollution and the like caused by a lot of phosphate tailing accumulation are effectively solved.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a process for enriching phosphorus concentrate from medium and low-grade phosphorus rock or phosphorus tailings while recovering calcium carbonate and magnesium hydroxide. Background technique [0002] Phosphate rock resources are important strategic resources of the country and the material basis of the phosphorus chemical industry. They are non-renewable. my country is rich in phosphor rock resources, but more than 80% of them are medium and low-grade phosphate rocks that are difficult to use directly. [0003] With the massive development and utilization of phosphate rock resources, the raw materials for phosphorus chemical production will have to rely on low- and medium-grade phosphate rock. The key to the utilization technology of low- and medium-grade phosphate rock lies in the enrichment of phosphorus and the removal of impurity magnesium. The low utili...

Claims

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Application Information

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IPC IPC(8): C01B25/01C01F11/18C01F5/20
CPCC01B25/01C01F5/20C01F11/181C01P2006/80
Inventor 张钦张富强卢玉莲岑忠举张澜曦韩瑜张娇张雄李容川邓永源
Owner 贵州盛源新材料股份有限公司
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