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Method for decomposing gypsum through synergistic fluidization

A gypsum and fluidization technology, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve the problems of uneconomical material consumption and energy consumption, low decomposition rate of gypsum, and low space-time yield, so as to save production costs and simplify production. Equipment structure, the effect of increasing space-time yield

Inactive Publication Date: 2016-08-17
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the current fluidized decomposition technology, the decomposition rate of gypsum is low, only 70% to 80%; a large amount of external circulation of compound additives and reactants makes material consumption and energy consumption uneconomical, high cost, and the space-time yield of the device is not high

Method used

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  • Method for decomposing gypsum through synergistic fluidization

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Embodiment 1

[0050] The average particle size of phosphogypsum particles is 5 μm, the average particle size of quartz sand particles is 100 μm, the mass ratio of phosphogypsum to quartz sand is 2:1; The molar ratio of carbon monoxide to phosphogypsum is 1:1; the reaction temperature is 500°C, and the residence time of solid reactants is 2min. The decomposition rate of gypsum is 96%, and the mole fraction of sulfur dioxide in the reacted gas is 7%.

Embodiment 2

[0052] The average particle size of desulfurized gypsum particles is 20 μm, the average particle size of chalcopyrite particles is 200 μm, the mass ratio of desulfurized gypsum to chalcopyrite is 1:1; %, the molar ratio of hydrogen to desulfurized gypsum is 3:1; the reaction temperature is 600°C, and the residence time of the solid reactant is 5min. The decomposition rate of gypsum is 97%, and the mole fraction of sulfur dioxide in the reacted gas is 9%.

Embodiment 3

[0054] The average particle size of phosphogypsum particles is 30 μm, the average particle size of quartz sand particles is 500 μm, and the mass ratio of phosphogypsum to quartz sand is 0.5:1; the molar fraction of carbon monoxide in the mixed gas introduced into the air inlet pipe 11 is 40%, The molar ratio of carbon monoxide to phosphogypsum is 4:1; the reaction temperature is 750°C, and the residence time of the solid reactant is 15 minutes. The decomposition rate of gypsum is 99%, and the mole fraction of sulfur dioxide in the reacted gas is 16%.

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Abstract

The invention relates to the technical field of gypsum decomposition and provides a method for decomposing gypsum through synergistic fluidization. The method comprises the steps of 1, uniformly mixing gypsum granulated raw materials with fluidizing agent particles, adding the gypsum granulated raw materials and the fluidizing agent particles into a bed body, and raising the temperature of the bed body to the set temperature; 2, introducing a gas mixture of a gas phase reducing agent and fluidization gas through a gas inlet pipe; 3, under the action of wind power of the gas mixture, making mixed particles of gypsum and a fluidizing agent enter and suspend in an isolator, and making the gas phase reducing agent be in contact with and react with the gypsum particles, so that calcium oxide particles, calcium sulphide particles and sulfur dioxide gas are obtained; 4, carrying the calcium oxide particles, the calcium sulphide particles and a small amount of gypsum particles obtained after the reaction out of the bed body with gas, while making the fluidizing agent and gypsum particles which are not involved into the reaction fall back to the bottom of the bed body through a gap between the isolator and the side wall of the bed body for reutilization; 5, introducing inert gas through a secondary air inlet structure. By means of the method, the space-time yield of sulfur dioxide is high, decomposition efficiency is high, and production cost is low.

Description

technical field [0001] The invention relates to the technical field of gypsum decomposition, in particular to a method for co-fluidization decomposition of gypsum. Background technique [0002] Gypsum is a class of substances whose main chemical composition is calcium sulfate. China is a country rich in both natural gypsum and industrial by-product gypsum resources, but most of the gypsum resources are used in building materials, especially the use of industrial by-product gypsum in building materials has many shortcomings, which greatly limits its utilization. At the same time, China is a country that lacks sulfur resources and limestone is the main raw material for cement production. Decomposing gypsum to make use of the sulfur and calcium resources contained in it is an effective way to solve the above-mentioned resource dilemma. [0003] Fluidized decomposition of gypsum with gas-phase reducing agent is an ideal gypsum decomposition technology. Please refer to Chinese ...

Claims

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Application Information

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IPC IPC(8): C01B17/50C01F11/08
CPCY02P20/133C01B17/506C01F11/08
Inventor 杨秀山孔行健王辛龙杨林张志业钟本和陈晓东
Owner SICHUAN UNIV
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