Phosphogypsum putty powder prepared from phosphogypsum

A technology of phosphogypsum and putty powder is applied in the field of comprehensive utilization of renewable resources, which can solve the problems of affecting appearance and low strength, and achieve the effects of good decoration effect, fast coagulation and hardening, and good breathing function.

Inactive Publication Date: 2018-02-09
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Phosphogypsum contains a variety of impurities, among which the presence of organic matter and compounds such as non-ferrous metal iron makes it grayish black. It is used in the production of building materials such as plastering gypsum and decorative gypsum, which will affect the appearance and have low strength.

Method used

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  • Phosphogypsum putty powder prepared from phosphogypsum
  • Phosphogypsum putty powder prepared from phosphogypsum
  • Phosphogypsum putty powder prepared from phosphogypsum

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The preparation operation steps of decolorized phosphogypsum are as follows:

[0041] (1) Put the phosphogypsum in a ball mill tank for ball milling, the ball milling speed is 300 r / min, mill for 1 hour, and get 300 mesh phosphogypsum powder;

[0042] (2) Put the phosphogypsum powder in a tube furnace, calcined at 400°C for 30 minutes, and naturally cooled to room temperature to obtain calcined phosphogypsum;

[0043] (3) Put calcined phosphogypsum and sulfuric acid solution with a mass fraction of 20% in a beaker according to the solid-to-liquid ratio of 1:4, stir at 80°C for 60 minutes, and then filter with suction (tightly connect the Buchner funnel to the suction filter bottle Connect, connect the air pump, put the filter paper into the Buchner funnel, moisten the filter paper with distilled water, slowly pour the solution stirred at constant temperature into the Buchner funnel, turn on the switch of the air pump, and start the suction filtration), washing (filter ...

Embodiment 2

[0050] The preparation operation steps of decolorized phosphogypsum are as follows:

[0051] (1) Put the phosphogypsum in a ball mill tank for ball milling, the ball milling speed is 300 r / min, mill for 1 hour, and get 300 mesh phosphogypsum powder;

[0052] (2) Put the phosphogypsum powder in a tube furnace, calcined at 400°C for 30 minutes, and naturally cooled to room temperature to obtain calcined phosphogypsum;

[0053] (3) Put calcined phosphogypsum and sulfuric acid solution with a mass fraction of 20% in a beaker according to the solid-to-liquid ratio of 1:4, stir at 80°C for 60 minutes, and then filter with suction (tightly connect the Buchner funnel to the suction filter bottle Connect, connect the air pump, put the filter paper into the Buchner funnel, moisten the filter paper with distilled water, slowly pour the solution stirred at constant temperature into the Buchner funnel, turn on the switch of the air pump, and start the suction filtration), washing (filter ...

Embodiment 3

[0062] The preparation operation steps of decolorized phosphogypsum are as follows:

[0063] (1) Put the phosphogypsum in a ball mill tank for ball milling, the ball milling speed is 300 r / min, mill for 1 hour, and get 300 mesh phosphogypsum powder;

[0064] (2) Put the phosphogypsum powder in a tube furnace, calcined at 400°C for 30 minutes, and naturally cooled to room temperature to obtain calcined phosphogypsum;

[0065] (3) Put calcined phosphogypsum and sulfuric acid solution with a mass fraction of 20% in a beaker according to the solid-to-liquid ratio of 1:4, stir at 80°C for 60 minutes, and then filter with suction (tightly connect the Buchner funnel to the suction filter bottle Connect, connect the air pump, put the filter paper into the Buchner funnel, moisten the filter paper with distilled water, slowly pour the solution stirred at constant temperature into the Buchner funnel, turn on the switch of the air pump, and start the suction filtration), washing (filter ...

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Abstract

The invention discloses phosphogypsum putty powder prepared from phosphogypsum. The phosphogypsum putty powder is prepared from the following materials: 75-85% of a base material namely decolored phosphogypsum, 10-20% of a filler, 0.3-0.7% of a water retaining agent, 3-7% of a thickener and 0.1-0.5% of a retarder. According to the invention, the whiteness of phosphogypsum is first improved by a method of calcination and acid leaching, and the calcination temperature and the solid-liquid ratio of the method of calcination and acid leaching are determined. The whiteness of the decolored and whitened phosphogypsum can be increased from 25.0% to 80.0% or higher, the decolored phosphogypsum decolored and whitened through the method of calcination and acid leaching is used as the base material for the preparation of the putty powder, and by adding additives, the putty is modified in retarding, water tolerance, crack resistance and other aspects. By the above method, the invention can enablethe putty powder prepared by an industrial waste namely phosphogypsum to obtain the optimum modification effect. Physical properties of the obtained putty powder are in line with the requirements in JG/T298-2010 Putty for Interior.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of renewable resources, in particular to a preparation method for using phosphogypsum to configure putty powder. Background technique [0002] Phosphogypsum is a by-product of wet production of phosphoric acid or phosphate compound fertilizer industry. It is the chemical gypsum waste with the largest discharge in my country. The chemical process of producing phosphogypsum is as follows: [0003] Ca 5 F(PO 4 ) 3 +5H 2 SO 4 +10H 2 O → 3H 4 PO 3 +5CaSO 4 2H 2 O+HF↑ [0004] The analysis shows that the main component of phosphogypsum is the same as that of natural gypsum, which is CaSO4 2H2O, but because phosphogypsum contains a small amount of harmful impurities such as phosphorus and fluorine, the utilization of phosphogypsum is limited, and it has caused great harm to the environment. Due to differences in production enterprises, production processes and control conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/34
CPCC09D5/34
Inventor 罗派峰周宇罡朱希兵张烨威赵翼冉
Owner HEFEI UNIV OF TECH
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