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Method for reduction and decomposition of phosphogypsum with yellow phosphorus tail gas

A technology of yellow phosphorus tail gas and phosphogypsum, which is applied in the field of phosphorus chemical industry, can solve problems such as environmental pollution, achieve the effects of reducing environmental pollution, being conducive to sustainable development, and reducing the decomposition temperature

Inactive Publication Date: 2009-07-29
KUNMING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0006] 1. The purpose of the invention: In order to provide technical support for the development of circular economy, develop a method for reducing and decomposing phosphogypsum with yellow phosphorus tail gas to produce high-concentration sulfur dioxide and qualified cement raw materials, and at the same time solve the environmental pollution problems caused by yellow phosphorus tail gas and phosphogypsum , provide a new way for the rational utilization of yellow phosphorus tail gas and phosphogypsum, develop potential carbon-sulfur resources, form a circular economic industrial chain of phosphorus chemical industry, and realize the comprehensive utilization of yellow phosphorus tail gas and phosphogypsum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: The main chemical composition of the naturally air-dried phosphogypsum is calculated by weight percentage: 35.24% of calcium oxide, 46.12% of sulfur dioxide, 0.082% of ferrous oxide, 0.133% of aluminum oxide, 1.14% of phosphorus pentoxide, and 0.09% of fluorine %, silicon dioxide 9.45%, moisture 7.56%. Put 10.0 g of phosphogypsum into the reduction and decomposition furnace, pass through the yellow phosphorus tail gas containing 85-90% CO by volume, the gas speed is 6mL / min, and the furnace temperature is controlled at 812±20°C, and the reduction and decomposition reaction is carried out for 21 minutes. The flue gas analyzer continuously detects the concentration of sulfur dioxide in the furnace gas online. If the volume percentage of sulfur dioxide is ≥15%, it indicates that the reaction is completed. Stop heating and reducing the decomposition furnace. The sulfur dioxide is directly used as a qualified raw material gas for the two-turn two-absorption acid...

Embodiment 2

[0013] Embodiment 2: The main chemical composition of naturally air-dried phosphogypsum is calculated by weight percent: 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 12.56%, moisture 12.64%. Put 15.0 g of phosphogypsum into the reduction and decomposition furnace, pass through the yellow phosphorus tail gas containing 85-90% CO by volume, the gas speed is 6mL / min, and the furnace temperature is controlled at 845±20°C, and the reduction and decomposition reaction is carried out for 34 minutes. The flue gas analyzer continuously detects the concentration of sulfur dioxide in the furnace gas online. If the volume percentage of sulfur dioxide is ≥15%, it indicates that the reaction is completed. Stop heating and reducing the decomposition furnace. The sulfur dioxide is directly used as a qualified raw material gas for the two-turn two-absorption acid production process. After n...

Embodiment 3

[0014] Embodiment 3: The main chemical composition of the naturally air-dried phosphogypsum is calculated in percentage by weight: 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 12.1%, moisture 9.5%. Put 20.0 g of the above-mentioned phosphogypsum into the reduction and decomposition furnace, pass through the yellow phosphorus tail gas containing 85-90% CO by volume, the gas velocity is 6mL / min, and the furnace temperature is controlled at 884±20°C, and the reduction and decomposition reaction is carried out for 46 minutes. Use a flue gas analyzer to continuously detect the concentration of sulfur dioxide in the furnace gas online. If the volume percentage of sulfur dioxide is ≥15%, it indicates that the reaction is completed. Stop heating the reduction and decomposition furnace, and the sulfur dioxide is directly used as a qualified raw material gas for the two-turn and two-ab...

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Abstract

The invention relates to a method for reducing and decomposing ardealite by tail gas of phosphor. The method comprises that: the naturally dried ardealite is put into a reductive decomposition furnace and filled with the tail gas of phosphor for reaction, and the furnace temperature is controlled to be between 700 and 1,000 DEG C, and the reaction time is between 10 and 50 minutes. The obtained furnace gas in which the content of the sulfur dioxide in percentage by volume is more than or equal to 15 percent is used as a material gas for the double-rotation double-suction acid preparation process; and the content of CaO, namely a solid product is more than or equal to 70 weight percent and is used as a cement material.

Description

1. Technical field [0001] The invention relates to a method for producing high-concentration sulfur dioxide and qualified cement raw materials by using two by-products phosphogypsum and yellow phosphorus tail gas in phosphorus chemical production, belonging to the field of phosphorus chemical industry. 2. Background technology [0002] Phosphogypsum is the industrial waste produced by the reaction between phosphate rock and sulfuric acid in the production process of wet-process phosphoric acid. It is calculated that 4-5 tons of phosphogypsum will be produced for every ton of phosphoric acid produced. At present, the annual discharge of phosphogypsum in the world is more than 200 million tons, but the utilization rate of phosphogypsum is not more than 10%. The treatment, disposal and comprehensive utilization of phosphogypsum have become a worldwide problem. my country's phosphate fertilizer production ranks first in the world. The production of high-concentration phosphate f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/08C01B17/50C01B31/20C01B32/50
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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