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Method for decomposing phosphogypsum with enclosed calcium carbide burner gas reduction

A phosphogypsum and calcium carbide furnace technology, which is applied in chemical instruments and methods, climate sustainability, inorganic chemistry, etc., can solve the problems such as the invention patent of reducing and decomposing phosphogypsum in a closed calcium carbide furnace furnace gas, etc., to reduce emissions, The effect of reducing environmental pollution and lowering the decomposition temperature

Inactive Publication Date: 2009-07-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, there have been no reports of invention patents or research literature on reducing and decomposing phosphogypsum with airtight calcium carbide furnace gas.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the main chemical composition mass percent of phosphogypsum is calcium oxide 35.24%, sulfur dioxide 46.12%, ferric oxide 0.082%, aluminum oxide 0.133%, phosphorus pentoxide 1.14%, total amount 100%; Send 10g of gypsum into the reduction and decomposition furnace, pass through the closed calcium carbide furnace gas containing 70-85% CO by volume, the flow rate is 6-10 ml / s, control the furnace temperature at 750-800°C, and carry out the reduction and decomposition reaction for 45 Minutes, use a flue gas analyzer to continuously detect the volume content of sulfur dioxide in the furnace gas online. When the volume percentage of sulfur dioxide is ≥ 15%, the reaction is complete. Stop heating the reduction decomposition furnace. After the reaction is complete, stop heating the reduction decomposition furnace. After natural cooling, take out the solid According to the analysis and calculation of the product, the decomposition rate of phosphogypsum is 97%, the de...

Embodiment 2

[0020] Embodiment 2: The mass percent of main chemical components of phosphogypsum is: calcium oxide 29.89%, sulfur dioxide 41.25%, ferric oxide 0.197%, aluminum oxide 0.312%, phosphorus pentoxide 0.89%, fluorine 0.18%, silicon dioxide 10.56% %; 15g of the above-mentioned phosphogypsum is sent into the reduction and decomposition furnace, and the airtight calcium carbide furnace gas containing 70 to 85% CO is fed into the furnace, and the flow rate is 6-10 milliliters per second, and the airtight calcium carbide furnace gas is controlled. The furnace temperature is 800-850°C. Carry out the reduction and decomposition reaction for 38 minutes, and use the flue gas analyzer to continuously detect the volume content of sulfur dioxide in the furnace gas online. When the volume percentage of sulfur dioxide is ≥ 15%, the reaction is complete. Stop heating the reduction and decomposition furnace. If the reaction is complete, stop heating the reduction and decomposition furnace. After ...

Embodiment 3

[0021] Embodiment 3: The mass percent of main chemical components of phosphogypsum is: calcium oxide 33.56%, sulfur dioxide 43.18%, ferric oxide 0.129%, aluminum oxide 0.21%, phosphorus pentoxide 1.17%, fluorine 0.24%, silicon dioxide 12.10% %; 20g of the above-mentioned phosphogypsum is sent into the reduction and decomposition furnace, and the airtight calcium carbide furnace gas containing 70-85% CO is fed into the furnace, the flow rate is 6-10 ml / s, and the furnace temperature is controlled to be 800-900°C. Carry out the reduction and decomposition reaction for 30 minutes, and use the flue gas analyzer to continuously detect the volume content of sulfur dioxide in the furnace gas online. When the volume percentage of sulfur dioxide is ≥ 15%, the reaction is complete. Stop heating the reduction and decomposition furnace. The reaction is complete. Stop heating the reduction and decomposition furnace. After cooling, the solid product was taken out for analysis and calculation...

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Abstract

The invention relates to a method for reducing and decomposing ardealite by furnace gas of a closed calcium carbide furnace. The technical problems needed to be solved comprise that: carbon monoxide in the furnace gas of the closed calcium carbide furnace is used as a reducer to reduce and decompose the ardealite, the decomposition temperature of the ardealite is controlled to be between 750 and 850 DEG C, the reaction time is between 10 and 50 minutes, sulfur dioxide with high concentration and qualified cement materials are obtained, the decomposition rate of the ardealite is more than or equal to 95 percent, and the desulphurization rate is more than or equal to 90 percent. The decomposition temperature of the ardealite is greatly reduced, thereby achieving the aims of saving energy and reducing consumption. The method develops potential carbon-sulfur resources, and realizes the comprehensive utilization of the ardealite and the furnace gas of the closed calcium carbide furnace; and simultaneously, the obtained calcium oxide can be used as a raw material to produce high quality cement, and the sulfur dioxide can be used as a material gas to produce acid.

Description

1. Technical field [0001] The invention relates to a method for producing high-concentration sulfur dioxide and qualified cement raw materials by utilizing the by-product phosphogypsum (solid waste) in the production of phosphorus chemical industry and the gas (exhaust gas) of the closed calcium carbide furnace in the production of calcium carbide, belonging to phosphorus chemical industry and calcium carbide furnace The field of comprehensive utilization of gas. 2. Background technology [0002] Phosphogypsum is the industrial waste produced by the reaction of phosphate rock and sulfuric acid in the production process of wet-process phosphoric acid. It is calculated that every ton of phosphoric acid produced will produce 4-5 tons of phosphogypsum. At present, the annual discharge of phosphogypsum in the world reaches 200 million However, the utilization rate of phosphogypsum has not exceeded 10%. The treatment, disposal and comprehensive utilization of phosphogypsum have be...

Claims

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Application Information

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IPC IPC(8): C01F11/08C01B17/50C01B31/20C01B32/50
CPCY02P20/10
Inventor 马丽萍郑绍聪宁平杜亚雷张伟牛学奎
Owner KUNMING UNIV OF SCI & TECH
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