Device and method for pretreating phosphogypsum by using magnesium hydroxide

A technology of magnesium hydroxide and a treatment method, which is applied in the application field of phosphogypsum, can solve the problems of poor cleaning effect, low strength, and many cleaning times, and achieves the effects of simple and easy method, good operability, and reduction of times.

Active Publication Date: 2020-07-10
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional phosphogypsum pretreatment method has problems such as many times of cleaning, low strength after cleaning and poor cleaning effect.

Method used

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  • Device and method for pretreating phosphogypsum by using magnesium hydroxide

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Experimental program
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Effect test

Embodiment 1

[0031] see figure 1 , a device for pretreating phosphogypsum with magnesium hydroxide, which includes a mixing bucket support frame 2, the top support of the mixing bucket support frame 2 is equipped with an agitator 1, and the bottom of the agitator 1 is provided with a Mixing cylinder 3 for materials to be processed. By adopting the device with the above structure, it can be used for preliminary cleaning treatment of phosphogypsum.

[0032] Further, the mixing cylinder 3 is provided with a valve. Through the above-mentioned valve, the waste water generated in the treatment process can be conveniently discharged.

[0033] Further, the device also includes a portable pH meter for measuring pH value. The above-mentioned portable pH meter can be used to measure the pH value during the cleaning process.

Embodiment 2

[0035] The treatment method of the device of pretreatment phosphogypsum with magnesium hydroxide, it comprises the following steps:

[0036] Step 1: Fix the support frame 2 of the mixing tank, erect the agitator 1 on the top of the support frame 2 of the mixing tank, and extend the stirring blade of the agitator 1 into the inside of the mixing cylinder 3;

[0037] Step 2: Take a certain amount of phosphogypsum and pour it into the inside of the mixing cylinder 3, and pour water into the inside of the mixing cylinder 3 according to the ratio of phosphogypsum to water as A;

[0038] Step 3: start the agitator 1, and fully stir and mix the water and phosphogypsum inside the mixing cylinder 3 through the agitator 1;

[0039] Step 4: Pour the magnesium hydroxide powder whose total amount is 0.01%~0.05% of the phosphogypsum mass into the bucket, and make it fully mix with the phosphogypsum body;

[0040] Step 5: start the agitator 1, stir the phosphogypsum added with magnesium hydr...

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Abstract

The invention provides a device and a method for pretreating phosphogypsum by using magnesium hydroxide. Magnesium hydroxide has a very good neutralizing effect on acid wastewater when used as an acidwastewater neutralizing treatment agent, the pH value of the neutralized wastewater does not exceed 9, and suspended particles in the wastewater can be quickly settled. Magnesium hydroxide is used asa reactant during phosphogypsum pretreatment, plays a good role, and can react with harmful substances in phosphogypsum to form precipitates to be discharged. The method can effectively reduce the cleaning frequency of phosphogypsum, improve the cleaning effect and improve the strength of the cleaned phosphogypsum. A foundation is laid for subsequent production of building gypsum products from phosphogypsum, and economic benefits are brought.

Description

technical field [0001] The invention relates to the technical field of phosphogypsum application, in particular to a device and method for pretreating phosphogypsum with magnesium hydroxide. Background technique [0002] The rapid development of the phosphorus chemical industry has made a large amount of phosphogypsum an industrial waste. In response to the concept of green environmental protection put forward by the country, how to develop and use phosphogypsum has attracted attention. When using phosphogypsum as a raw material to produce building gypsum products, the first step is to remove impurities to eliminate the impact of harmful substances or impurities on the performance of gypsum products. This puts forward requirements for the pretreatment of phosphogypsum. The traditional phosphogypsum pretreatment method has problems such as many times of cleaning, low strength after cleaning and poor cleaning effect. Contents of the invention [0003] In order to solve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26B01J19/18
CPCB01J19/18C04B11/26
Inventor 徐港黄惠萍刘冬梅武文林赵祥瑞杨浩宇玉霞杨国镇
Owner CHINA THREE GORGES UNIV
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