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Method for preparing building gypsum powder from ardealite

A technology for building gypsum powder and phosphogypsum, which is applied in the field of phosphogypsum reuse, can solve the problems of high calcination temperature, high energy consumption, unstable product properties, etc., and achieves the effects of improving purity, low energy consumption and easy operation.

Active Publication Date: 2021-10-19
四川省生态环境科学研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for preparing building gypsum powder with phosphogypsum, which can effectively solve the problems of high calcination temperature, high energy consumption and unstable product properties in the existing method

Method used

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  • Method for preparing building gypsum powder from ardealite
  • Method for preparing building gypsum powder from ardealite

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Experimental program
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Effect test

Embodiment 1

[0031] A method for preparing building gypsum powder with phosphogypsum, comprising the following steps:

[0032] (1) Mix phosphogypsum and residual hot water at 50°C according to the solid-to-liquid ratio of 1:8 under agitation and re-slurry, then let it stand for 5 minutes, and then remove the oily impurities on the surface of the slurry;

[0033] (2) Put the slurry in step (1) into the cyclone separator for cyclone separation. The cylinder diameter of the cyclone separator is 300mm, the diameter of the overflow pipe is 80mm, the feeding pressure is 0.1MPa, and the cyclone separation time is 30s , to collect the final bottom slag;

[0034] (3) Centrifuge and dehydrate the bottom slag in step (2) to a moisture content of 10% to obtain a phosphogypsum wet material, then dry the phosphogypsum wet material at 80°C for 1 hour, and then calcinate at 150°C 2h, prepared.

Embodiment 2

[0036] A method for preparing building gypsum powder with phosphogypsum, comprising the following steps:

[0037] (1) Mix phosphogypsum and residual hot water at 80°C according to the solid-to-liquid ratio of 1:15 under agitation, then re-slurry and let it stand for 3 minutes, and then remove the oily impurities on the surface of the slurry;

[0038] (2) Set aside the slurry in step (1), and then put it into the cyclone separator for cyclone separation. The cylinder diameter of the cyclone separator is 350 mm, the diameter of the overflow pipe is 120 mm, and the feeding pressure is 0.3 MPa, the cyclone separation time is 30s, and the final bottom slag is collected;

[0039] (3) Centrifuge and dehydrate the bottom slag in step (2) to a moisture content of 11% to obtain a phosphogypsum wet material, then dry the phosphogypsum wet material at 90°C for 0.5h, and then dry the phosphogypsum wet material at 180°C Calcined for 1h, obtained.

Embodiment 3

[0041] A method for preparing building gypsum powder with phosphogypsum, comprising the following steps:

[0042] (1) Mix phosphogypsum and residual hot water at 65°C according to the solid-to-liquid ratio of 1:10 under agitation and re-slurry, then let it stand for 5 minutes, and then remove the oily impurities on the surface of the slurry;

[0043](2) Set aside the slurry in step (1), and then put it into the cyclone separator for cyclone separation. The cylinder diameter of the cyclone separator is 350 mm, the diameter of the overflow pipe is 120 mm, and the feeding pressure is 0.3 MPa, the cyclone separation time is 30s, and the final bottom slag is collected;

[0044] (3) Centrifuge and dehydrate the bottom slag in step (2) to a moisture content of 10% to obtain a phosphogypsum wet material, then dry the phosphogypsum wet material at 85°C for 0.7h, and then dry the phosphogypsum wet material at 165°C Calcined for 1.5h, obtained.

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Abstract

The invention discloses a method for preparing building gypsum powder from ardealite, which comprises the following steps: mixing ardealite and production waste heat water under a stirring condition, conducting pulping, conducting standing, and removing oil-containing impurities on the surface layer of pulp; and feeding the residual slurry into a multi-stage cyclone separation device for cyclone washing, removing dissolved sulfuric acid, phosphoric acid, heavy metal and the like, collecting final bottom slag for centrifugal dewatering, obtaining ardealite (the water content is within 12%), then conducting drying and calcining to prepare building gypsum powder. The method can effectively solve the problems of high calcination temperature, high energy consumption and unstable product property in the existing method.

Description

technical field [0001] The invention relates to the technical field of phosphogypsum reuse and specifically designs a method for preparing building gypsum powder from phosphogypsum. Background technique [0002] In the current wet-process phosphoric acid production process, every ton of P 2 o 5 Effective product, accompanied by 4-6 tons of phosphogypsum. my country's phosphorus chemical industry produces about 70 million tons of phosphogypsum every year, and the total accumulation of phosphogypsum in my country has exceeded 300 million tons. At present, most of the phosphogypsum solid waste can only be discharged by stockpiling, which occupies a large amount of land. At the same time, phosphogypsum soluble phosphorus, fluorine, etc. seep into the soil and water, causing great pollution. At present, the comprehensive effective utilization rate of phosphogypsum is less than 30%, and the annual discharge and accumulation of phosphogypsum over the years have seriously restric...

Claims

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Application Information

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IPC IPC(8): C04B11/26C04B11/02
CPCC04B11/26C04B11/02Y02W30/91
Inventor 雍毅薛嘉郭卫广侯江寇峻伟刘静罗大鹏
Owner 四川省生态环境科学研究院
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