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Method for fluidization removal of magnesium from phosphate ore

A fluidized and phosphate rock technology, applied in the chemical industry, can solve problems such as large phosphorus loss, and achieve the effects of small environmental impact, easy availability of raw materials and high utilization efficiency

Inactive Publication Date: 2014-07-30
GUIZHOU KAILIN GRP CO LTD
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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 provide a method for fluidized magnesization of phosphate ore to solve the disadvantages of the prior art in the process of demagnesization of phosphoric acid powder and the large loss of phosphorus

Method used

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  • Method for fluidization removal of magnesium from phosphate ore

Examples

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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the raw phosphate ore (P 2 0 5 content of 28% and MgO content of 3%) to obtain phosphate rock powder after crushing, grinding, grading and passing through a 300 mesh sieve. 30% slurry; add sulfuric acid to the acid tank to adjust the hydrogen ion concentration to 10*10 -4 mol / L solution to get the demagnesizing solution; then the phosphate rock slurry is added to the fluidized demagnesizing tower reaction section from the conical liquid inlet section of the fluidized demagnesizing tower with a flow rate of 9kg / h. The magnesium removal solution is added to the reaction section of the fluidized magnesium removal tower from the liquid inlet at the lower end of the fluidized magnesium removal tower reaction section at a flow rate of 10kg / h, so that the slurry and the magnesium removal solution are in the fluidized magnesium removal tower. The fluidized reaction area is mixed and the chemical reaction time is controlled to be 1h to remove the ma...

Embodiment 2

[0037] Such as figure 1 As shown, the raw phosphate ore (P2 0 5 content of 28% and MgO content of 3%) to obtain phosphate rock powder after crushing, grinding, grading and passing through a 300 mesh sieve. 40% slurry; add phosphoric acid to the acid tank, adjust the hydrogen ion concentration to 20*10 -4 mol / L solution, promptly gets the demagnesification liquid; Then the phosphate rock slurry is joined in the fluidized demagnesization tower reaction section from the conical liquid inlet section of the fluidized demagnesization tower with the flow rate of 11kg / h, The magnesium removal solution is added to the reaction section of the fluidized magnesium removal tower from the liquid inlet at the lower end of the fluidized magnesium removal tower reaction section at a flow rate of 40kg / h, so that the slurry and the magnesium removal solution are in the fluidized magnesium removal tower. The fluidized reaction area is mixed and the chemical reaction time is controlled to be 2 h...

Embodiment 3

[0040] Such as figure 1 As shown, the raw phosphate ore (P 2 0 5 content of 28% and MgO content of 3%) to obtain phosphate rock powder after crushing, grinding, grading and passing through a 300 mesh sieve. 35% slurry; add sulfuric acid to the acid tank to adjust the hydrogen ion concentration to 15*10 -4 mol / L solution, promptly gets the demagnesification liquid; Then the phosphate rock slurry is joined in the reaction section of the fluidized demagnesization tower from the conical liquid inlet section of the fluidized demagnesization tower with the flow rate of 10kg / h, The magnesium removal solution is added to the reaction section of the fluidized magnesium removal tower from the liquid inlet at the lower end of the fluidized magnesium removal tower reaction section at a flow rate of 15kg / h, so that the slurry and the magnesium removal solution are in the fluidized magnesium removal tower. The fluidized reaction area is mixed and the chemical reaction time is controlled ...

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Abstract

The invention discloses a method for fluidization removal of magnesium from a phosphate ore. The method comprises the steps: grinding a raw phosphate ore into a phosphate ore powder, then adding water, and adjusting into a slurry; then adding the phosphate ore slurry and a magnesium removal liquid into a fluidization magnesium removal tower, mixing, and generating a reaction; successively carrying out solid-liquid separation, washing and drying on the phosphate ore slurry after magnesium removal to obtain a phosphate ore concentrate; adding an acid respectively into a magnesium-containing solution a obtained from solid-liquid separation of the phosphate ore slurry and the washed water of the phosphate ore slurry to prepare magnesium removal liquids; and carrying out shunting treatment of the reacted liquid after magnesium removal. The fluidization technology is applied in the phosphate ore magnesium-removal process, and parameters of each process step are controlled, the content of available phosphorus in the phosphate ore concentrate after treatment is 32% or more, and the content of magnesium oxide is 0.65% or less.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for fluidized magnesium removal of phosphate rock. Background technique [0002] The content of MgO in phosphate rock has become one of the main indicators for evaluating the quality of phosphate rock in wet-process phosphoric acid production. The content of MgO in phosphate rocks in China is obviously high, which has a negative impact on the production of phosphate fertilizers such as phosphoric acid, superphosphate and ammonium phosphate. Therefore, the research on the magnesium removal process of phosphate rock has become a hot topic in the scientific research and production of phosphate rock. During the production process of wet-process phosphoric acid, Mg, the main impurity in the raw material phosphate rock, is brought into the phosphoric acid product. This impurity not only reduces the efficiency of phosphoric acid production, but also hinders the economic and te...

Claims

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Application Information

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IPC IPC(8): C01B25/01C01B25/12C01F5/40C01B25/34
Inventor 刘琼廖吉星徐圆朱飞武彭宝林
Owner GUIZHOU KAILIN GRP CO LTD
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