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Technology for adopting wet process phosphoric acid as raw material to prepare magnesium hydrogen phosphate

A technology of wet-process phosphoric acid and magnesium hydrogen phosphate, applied in the direction of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low efficiency, high cost of magnesium hydrogen phosphate preparation process, etc., to improve production efficiency, facilitate operation and production, The effect of simple preparation process

Inactive Publication Date: 2018-07-27
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing magnesium hydrogen phosphate preparation process has high cost and low efficiency, and the purpose is to provide a process for producing magnesium hydrogen phosphate using wet-process phosphoric acid as a raw material, so as to solve the problem of the production process of magnesium hydrogen phosphate

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  • Technology for adopting wet process phosphoric acid as raw material to prepare magnesium hydrogen phosphate
  • Technology for adopting wet process phosphoric acid as raw material to prepare magnesium hydrogen phosphate

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Embodiment 1

[0033] Such as figure 1 Shown, a kind of adopting wet-process phosphoric acid of the present invention is the technique that raw material produces magnesium hydrogen phosphate, comprises the following steps:

[0034] (1) Add 1.15g of calcium carbonate to 50g of wet-process phosphoric acid for desulfurization in a desulfurized phosphoric acid device, stir for h at 60°C, and stirrer rotation speed 300r / min;

[0035] (2) Add 6.7g sodium hydroxide to desulfurized phosphoric acid, react for 4 hours at a pH of 4.5 and a reaction temperature of 60°C to 70°C, precipitate iron and aluminum phosphate to remove the main impurities, filter the slurry to obtain White manure filter residue;

[0036] (3) Add 35mL P507 extractant to the filtrate to further purify the iron and aluminum impurities in the solution, extract at normal temperature for 10min, separate phases, the water phase enters the next reaction device, and the organic phase regeneration is recovered by the P507 extractant for ...

Embodiment 2

[0040] Include the following steps:

[0041] (1) Add 0.69g of calcium carbonate to 30g of wet-process phosphoric acid and desulfurize in a desulfurized phosphoric acid device, stir at 60°C for 4h, and the rotation speed of the agitator is 300r / min;

[0042] (2) Add 4g of sodium hydroxide to the desulfurized phosphoric acid, and react for 4 hours at a pH of 4.5 and a reaction temperature of 60-70°C to remove the fluosilicic acid in the raw material, and simultaneously precipitate a large amount of iron hydrogen phosphate and aluminum hydrogen phosphate After finishing the reaction, the slurry is filtered to obtain the white fertilizer filter residue;

[0043] (3) Add 35mL P507 extractant to the filtrate to further purify the iron and aluminum impurities in the solution, extract at normal temperature for 10min, separate phases, the water phase enters the next reaction device, and the organic phase regeneration is recovered by the P507 extractant for recycling;

[0044] (4) addi...

Embodiment 3

[0047] Include the following steps:

[0048] (1) Add 1.84g of calcium carbonate to 80g of wet-process phosphoric acid to desulfurize in a desulfurized phosphoric acid device, stir for 4 hours at 60°C, and stirrer rotation speed 300r / min;

[0049] (2) Add 10.7g of sodium hydroxide to the desulfurized phosphoric acid, and react for 4 hours at a pH of 4.5 and a reaction temperature of 60-70°C to remove the fluosilicic acid in the raw material, and simultaneously precipitate a large amount of ferric hydrogen phosphate and hydrogen phosphate aluminum, after finishing the reaction, the slurry is filtered to obtain the white fertilizer filter residue;

[0050] (3) Add 35mL P507 extractant to the filtrate to further purify the iron and aluminum impurities in the solution, extract at normal temperature for 10min, separate phases, the water phase enters the next reaction device, and the organic phase regeneration is recovered by the P507 extractant for recycling;

[0051] (4) adding 5....

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Abstract

The invention discloses a technology for adopting wet process phosphoric acid as a raw material to prepare magnesium hydrogen phosphate. Calcium carbonate is added into wet process phosphoric acid tobe subjected to desulfuration in a desulfuration phosphoric acid device, stirring is conducted for 4 hours at the temperature of 60 DEG C, and the revolution number of a stirrer is 300 r / min; sodium hydroxide is added into desulfuration phosphoric acid, a reaction is carried out for 4 hours under the conditions that the PH value is 4.5 and the reaction temperature is 60-70 DEG C, phosphate or ironand aluminum is precipitated so that main impurities can be removed, the slurry is filtered, and calcium bicarbonate filter slag is obtained; 35mL of a P507 extraction agent is added into the filterliquid, extraction is conducted for 10 minutes at the room temperature, phase splitting is conducted, a water phase enters a next reaction device, an organic phase is regenerated and recycled throughthe P507 extraction agent to be used cyclically; magnesium hydrate is added into the water phase to adjust the PH value to be 6-6.5, and a precipitation crystal is obtained; and the precipitation crystal is subjected to centrifugal separation, the crystal obtained through separation is dried, and magnesium hydrogen phosphate is obtained. The technology effectively reduces the production cost, andimproves the production efficiency.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a process for producing magnesium hydrogen phosphate by using wet-process phosphoric acid as a raw material. Background technique [0002] Environmental issues have now become global issues, the most prominent of which is water pollution. The per capita share of water resources in my country is only 1 / 40 of the world's per capita share, and water resources are very scarce; not only that, but with the continuous development of my country's industry and agriculture and the discharge of a large amount of ammonia nitrogen wastewater, the existing water environment is also rapidly deteriorating. Industrial wastewater accounts for more than 65% of my country's wastewater discharge, and a lot of nitrogen-containing wastewater is directly discharged into water bodies without standard treatment. Ammonia nitrogen itself is not toxic, but when its concentration exceeds a certain conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32B01J20/04B01J20/30C02F1/28C02F101/16
CPCB01J20/048C01B25/32C02F1/281C02F2101/16
Inventor 周堃郑东升陈丽萍谢刚吴越
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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