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Method for producing industrial grade monoammonium phosphate through combination of wet process phosphoric acid and high-purity phosphoric acid

A technology of wet-process phosphoric acid and monoammonium phosphate, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of unstable product quality and poor impurity removal effect, and solve the problems of difficult product quality assurance, short process route, The effect of good economic benefits

Inactive Publication Date: 2014-03-05
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 combining wet-process phosphoric acid and high-purity phosphoric acid to produce industrial-grade monoammonium phosphate, so as to solve the problems in the prior art that the process of producing monoammonium phosphate has poor impurity removal effect and unstable product quality

Method used

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  • Method for producing industrial grade monoammonium phosphate through combination of wet process phosphoric acid and high-purity phosphoric acid
  • Method for producing industrial grade monoammonium phosphate through combination of wet process phosphoric acid and high-purity phosphoric acid

Examples

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Effect test

Embodiment 1

[0040] (1) Put 1000kg of wet-process dilute phosphoric acid with a sulfate content of 2.5% into a desulfurization tank, heat to 75°C, add 26kg of mineral powder, stir for 60 minutes, put it into a centrifuge to separate the phosphogypsum, and transport the phosphogypsum To the phosphogypsum storage yard, the filtrate is desulfurized dilute phosphoric acid and put into the desulfurized phosphoric acid storage tank.

[0041] (2) Pump the desulfurized dilute phosphoric acid described in step 1 into a primary neutralization reaction tank, pass through gas ammonia to neutralize until the pH value reaches 4.0, put it into a centrifuge and filter it to obtain a primary neutralization filtrate, and put it into a primary neutralization reaction tank. Store the neutralized filtrate tank.

[0042] (3) Pump the primary neutralization filtrate in step 2 to the secondary neutralization reaction tank, add gas ammonia to neutralize the pH to 7.5, put it into a centrifuge to separate the secon...

Embodiment 2

[0049] (1) Put 1,500kg of wet-process dilute phosphoric acid with a sulfate content of 2.2% into a desulfurization tank, heat to 80°C, add 32.90kg of mineral powder, stir for 45 minutes, and put it into a centrifuge to separate the phosphogypsum and phosphogypsum Transported to the phosphogypsum yard, the filtrate is desulfurized dilute phosphoric acid and put into the desulfurized phosphoric acid storage tank.

[0050] (2) Pump the desulfurized dilute phosphoric acid described in step 1 into a primary neutralization reaction tank, pass through liquid ammonia to neutralize until the pH value reaches 4.5, put it into a centrifuge and filter it to obtain a primary neutralization filtrate, and put it into a primary neutralization reaction tank. Store the neutralized filtrate tank.

[0051] (3) Pump the primary neutralization filtrate in step 2 to the secondary neutralization reaction tank, add liquid ammonia to neutralize the pH to 8.0, put it into a centrifuge to separate the se...

Embodiment 3

[0057] (1) Put 1,300kg of wet-process dilute phosphoric acid with a sulfate content of 2.4% into a desulfurization tank, heat to 85°C, add 29.50kg of mineral powder, stir for 30 minutes, and put it into a centrifuge to separate the phosphogypsum and phosphogypsum Transported to the phosphogypsum yard, the filtrate is desulfurized dilute phosphoric acid and put into the desulfurized phosphoric acid storage tank.

[0058] (2) Pump the desulfurized dilute phosphoric acid described in step 1 into a primary neutralization reaction tank, pass through gas ammonia to neutralize until the pH value reaches 5.0, put it into a centrifuge and filter it to obtain a primary neutralization filtrate, and put it into a primary neutralization reaction tank. Store the neutralized filtrate tank.

[0059] (3) Pump the primary neutralization filtrate in step 2 to the secondary neutralization reaction tank, add liquid ammonia to neutralize the pH to 8.5, put it into a centrifuge to separate the secon...

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Abstract

The invention discloses a method for producing industrial grade monoammonium phosphate through combination of wet process phosphoric acid and high-purity phosphoric acid. The method comprises the steps of performing neutralization reaction for two times on filtrate and ammonia gas or ammonia water to obtain ammonium phosphate slurry, wherein the filtrate is obtained by performing desulfurization reaction on phosphate rock powder and wet process phosphoric acid; performing concentration, crystallization and drying by using filtrate which is obtained by adjusting the pH value with high-purity phosphoric acid to obtain an industrial grade monoammonium phosphate product; removing most of impurity ions when the pH value is neutralized to 4.0-5.0 by the first neutralization reaction, then performing the second neutralization reaction to remove impurities in the wet process phosphoric acid, finely adjusting the pH value to 3.9-4.4 by using the high-purity phosphoric acid, and performing concentration and crystallization to obtain the industrial grade monoammonium phosphate. The method disclosed by the invention reduces the production cost and energy consumption and is environment-friendly and pollution-free; the obtained product is stable in quality, the process flow is short, the device construction investment is saved, the needed operators are less, the energy consumption is reduced, the pollution is reduced, and the quality of monoammonium phosphate is ensured through effective impurity removal, so that the method has a very good economic benefit.

Description

technical field [0001] The invention relates to a method for producing industrial-grade monoammonium phosphate by combining wet-process phosphoric acid and high-purity phosphoric acid. Background technique [0002] In the prior art, two methods are used for the production of industrial-grade monoammonium phosphate, one is thermal phosphoric acid or purified phosphoric acid process (high-purity phosphoric acid method), and the other is wet-process phosphoric acid (dilute phosphoric acid method) process. The disadvantages of the industrial-grade monoammonium phosphate produced by the high-purity phosphoric acid method are that the production cost is high, the pollution is large, and the energy consumption is high. [0003] The production of industrial-grade monoammonium phosphate by the dilute phosphoric acid method is to use ammonia and dilute phosphoric acid to neutralize once to pH 4.0-5.0 to filter and remove impurities. In this pH range, only the vast majority of impurity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28
Inventor 徐魁廖吉星潘礼富彭宝林朱飞武韩朝应王淋峰周勇王先炜郑超
Owner GUIZHOU KAILIN GRP CO LTD
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