Method for magnesium removal of phosphate rock and co-production of magnesium carbonate and calcium carbonate

A technology of magnesium carbonate and calcium carbonate, which is applied in the field of phosphorus chemical industry, can solve the problems of low utilization rate of waste liquid, high loss rate of phosphorus, and high production cost, and achieve the effects of low production cost, low loss rate of phosphorus, and short treatment process

Pending Publication Date: 2019-09-20
SICHUAN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the content of the present invention is to provide a production technology for pretreatment of medium and low-grade phosphate rock, which overcomes the long pretreatment process, high energy consumption, high phosphorus loss rate, high production cost, and The low utilization rate of waste liquid causes pollution and other problems. The low-grade phosphate rock is leached by the dilute nitric acid circulation method to effectively remove impurities such as magnesium elements in the phosphate rock and improve the grade of the phosphate rock. At the same time, the leaching solution is used to produce magnesium carbonate and carbonic acid Calcium, realizing low-cost medium and low-grade phosphate rock pretreatment

Method used

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  • Method for magnesium removal of phosphate rock and co-production of magnesium carbonate and calcium carbonate

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Experimental program
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Effect test

Embodiment 1

[0053] Such as figure 1 As shown, after the low-grade phosphate rock is crushed, crushed, and sieved, the phosphate rock powder with a particle size of 60-80 mesh is obtained, and water is added to prepare a slurry with a water content of 35%.

[0054] Add the nitric acid solution to the phosphate rock slurry with a water content of 35%, and fully mix it at a speed of 300r / min for reaction. The reaction time is 2 hours, and the temperature of the control process is 45°C. To control the pH of the reaction system to be 2, the liquid-solid ratio is 3:1.

[0055] After the reaction is completed, the phosphate rock slurry after demagnesification is obtained; the phosphate rock slurry after demagnesification flows out from the reaction tank and is transferred to the solid-liquid separator, and is separated to obtain a solid phase a with a moisture content of 10wt%-20wt% and a solid phase a containing For magnesium solution b, wash the solid phase a with distilled water until the wa...

Embodiment 2

[0062] Such as figure 1 As shown, after the low-grade phosphate rock is crushed, crushed, and sieved, the phosphate rock powder with a particle size of 80-100 mesh is obtained, and water is added to prepare a slurry with a water content of 35%.

[0063] Add the nitric acid solution to the phosphate rock slurry with a water content of 35%, and fully mix it at a speed of 300r / min for reaction. The reaction time is 4 hours, and the temperature of the control process is 40°C. To control the pH of the reaction system to be 3.5 and the liquid-solid ratio to be 4:1.

[0064] After the reaction is completed, the phosphate rock slurry after demagnesification is obtained; the phosphate rock slurry after demagnesification flows out from the reaction tank and is transferred to the solid-liquid separator, and is separated to obtain a solid phase a with a moisture content of 10wt%-20wt% and a solid phase a containing For magnesium solution b, wash the solid phase a with distilled water unt...

Embodiment 3

[0071] Such as figure 1 As shown, after jaw crushing, crushing, and screening, phosphate rock powder with a particle size between 40 and 60 meshes is obtained, and water is added to prepare a slurry with a water content of 35%.

[0072] Add the nitric acid solution into the phosphate rock slurry with a water content of 35%, and fully mix it at a speed of 300r / min for reaction. The reaction time is 3 hours, and the temperature of the control process is 55°C. To control the pH of the reaction system to be 2.5, the liquid-solid ratio is 2.5:1.

[0073] After the reaction is completed, the phosphate rock slurry after demagnesification is obtained; the phosphate rock slurry after demagnesification flows out from the reaction tank and is transferred to the solid-liquid separator, and is separated to obtain a solid phase a with a moisture content of 10wt%-20wt% and a solid phase a containing For magnesium solution b, wash the solid phase a with distilled water until the washing wate...

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Abstract

The invention belongs to the field of phosphorus chemical industry, and concretely relates to a method for magnesium removal of phosphate rock and co-production of magnesium carbonate and calcium carbonate. The method for the magnesium removal of the phosphate rock and the co-production of the magnesium carbonate and the calcium carbonate includes the following steps: A, adding a nitric acid solution into phosphate rock slurry, controlling the pH of a reaction system to be 2-4 and a liquid-solid ratio be 2-4:1, and obtaining the phosphate plasm after a reaction is completed, wherein the phosphorus rock slurry is obtained by mixing phosphate rock powder and water; B, carrying out solid-liquid separation on the phosphate rock plasm obtained in the step A to obtain solid-phase a and a magnesium-containing solution b, and washing and drying the solid-phase a to obtain low-magnesium concentrate; and C introducing NH3 and CO2 into the magnesium-containing solution b to obtain the calcium carbonate and the magnesium carbonate. The method of the invention realizes the magnesium removal of the phosphate rock and the co-production of the magnesium carbonate and the calcium carbonate.

Description

technical field [0001] The invention belongs to the field of phosphorus chemical industry, and in particular relates to a method for removing magnesium from phosphate rock and co-producing magnesium carbonate and calcium carbonate. Background technique [0002] my country's phosphate rock reserves are huge, ranking second in the world, and most of them are medium and low-grade collophosite with difficult mineral processing, tight structure, and high impurity content. The situation of "difficult to choose and difficult to distinguish" has been listed by the Ministry of Land and Resources as unable to meet the needs of national production. At present, the phosphorus chemical industry has an increasing demand for phosphate rock resources, but the rich ore is scarce, and it is urgent to find a reasonable and effective method to develop and utilize low-grade phosphate rock. Among them, high-magnesium phosphate rock has the largest proportion, and its impurity components include d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24C01F11/18
CPCC01F5/24C01F11/181
Inventor 杨秀山张志业肖勇许德华王辛龙杨林
Owner SICHUAN UNIV
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