Method for producing beta-high-purity gypsum powder by using phosphogypsum

A technology of phosphogypsum and gypsum powder, which is applied in the field of phosphogypsum production of β-high-purity gypsum powder, which can solve the problems of unstable product quality, difficult temperature control, high calcination temperature, etc., to ensure whiteness and index stability, and equipment loss The effect of small, low calcination temperature

Active Publication Date: 2015-01-28
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this method: (1) high calcination temperature and high energy consumption; (2) temperature control in the production process is difficult, the product quality is unstable, and the application is limited

Method used

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  • Method for producing beta-high-purity gypsum powder by using phosphogypsum
  • Method for producing beta-high-purity gypsum powder by using phosphogypsum
  • Method for producing beta-high-purity gypsum powder by using phosphogypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for producing β-high-purity gypsum powder with phosphogypsum, the steps are as follows:

[0032] (1) Dry phosphogypsum with a surface water content of ≤25% at room temperature until the free water content is ≤3%, and send it to the FC-compartment calciner for calcination for 2.5 hours. The maximum temperature in the calciner is 130°C, and the outlet material temperature is 110°C, the absolute pressure on the top of the FC-compartment calciner is 99.0KPa~100.2KPa;

[0033] (2) The material calcined in step (1) is crushed by a primary crushing device to a particle size of ≤125 microns, with a sieve residue of ≤3.00%;

[0034] (3) Send the material obtained in step (2) into an airtight aging warehouse, and airtightly age it at room temperature for 3 days. The aged material is crushed by a secondary crushing device, and the particle size grade is 106 microns (screen residue ≤ 3.00 %) and materials with a particle size grade of 95 microns (residual sieve ≤ 3.00%) a...

Embodiment 2

[0039] A method for producing β-high-purity gypsum powder with phosphogypsum, the steps are as follows:

[0040] (1) Dry phosphogypsum with a surface water content of ≤25% at room temperature until the free water content is ≤3%, and send it to the FC-compartment calciner for calcination for 2.8 hours. The maximum temperature in the calciner is 135°C, and the outlet material temperature is The temperature is 115°C, and the absolute pressure on the top of the FC-compartment calciner is 99.0KPa~100.2KPa;

[0041] (2) The material calcined in step (1) is crushed by a primary crushing device to a particle size of ≤125 microns, with a sieve residue of ≤3.00%;

[0042] (3) Send the material obtained in step (2) into an airtight aging warehouse, and airtightly age it at room temperature for 4 days. The aged material is crushed by a secondary crushing device, and the particle size grade is 112 microns (screen residue ≤ 3.00 %) and material with a particle size grade of 90 microns (res...

Embodiment 3

[0047] A method for producing β-high-purity gypsum powder with phosphogypsum, the steps are as follows:

[0048] (1) Dry phosphogypsum with a surface water content of ≤25% at room temperature until the free water content is ≤3%, and send it to the FC-compartment calciner for calcination for 3 hours. The maximum temperature in the calciner is 140°C, and the outlet material temperature is The temperature is 120°C, and the absolute pressure on the top of the FC-compartment calciner is 99.0KPa~100.2KPa;

[0049] (2) The material calcined in step (1) is crushed by a primary crushing device to a particle size of ≤125 microns, with a sieve residue of ≤3.00%;

[0050] (3) Send the material obtained in step (2) into an airtight aging warehouse, and airtightly age it at room temperature for 5 days. The aged material is crushed by a secondary crushing device, and the particle size grade is 120 microns (screen residue≤3.00 %) and the material with a particle size grade of 110 microns (re...

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Abstract

The invention relates to a method for producing beta-high-purity gypsum powder by using phosphogypsum. The method comprises the following steps: (1) drying phosphogypsum until the mass content of free water is less than or equal to 3%, and calcining at a temperature of 130 to 150 DEG C under pressure of 99.0KPa to 100. 2KPa for 2.5 to 3.5 hours; (2) crushing a material calcined in the step (1) until the particle size is less than or equal to 125 microns and the screen residue is less than or equal to 3.00%; (3) hermetically aging the material obtained in the step (2) at normal temperature for 3 to 5 days, crushing the aged material to different grades of particle size between 75 to 125 microns, and carrying out graded mixing on products of different particle sizes to obtain beta-high-purity gypsum powder. The calcination is carried out under the negative pressure condition of 99.0KPa to 100. 2KPa, the energy consumption is low, and the obtained product has high performance index, strong stability and high performance cost ratio; the whiteness is more than or equal to 94, the content of calcium sulfate hemihydrate is more than or equal to 92%, the radioactivity index is low, and the wet flexural strength is up to 4.0Mpa at 2 hours.

Description

technical field [0001] The invention belongs to the field of building material production and environmental treatment, and relates to a method for producing β-high-purity gypsum powder from phosphogypsum. Background technique [0002] Phosphogypsum is industrial waste discharged from industrial production processes such as phosphate fertilizers and phosphate chemicals. Its accumulation not only takes up a lot of land, but also pollutes the environment. Many researchers and engineers have conducted extensive research on the application and treatment of phosphogypsum, but its high impurity content, various types, acidity, and unstable performance have brought great restrictions to its application. After treatment, it is mainly used It is used for processing low-end construction products such as cement retarder, gypsum block, and gypsum board, and its economic benefits are relatively low. [0003] At present, the main methods for processing phosphogypsum into hemihydrate gypsu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
Inventor 朱孔杰于家涛鲁建民胡兆平李新柱
Owner KINGENTA ECOLOGICAL ENG GRP
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