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Method for reductively decomposion of ardealite by composite reducer

A reducing agent and phosphogypsum technology, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve environmental problems and achieve the effects of reducing reaction temperature, production cost, and energy consumption

Inactive Publication Date: 2008-12-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, it can also solve the environmental problems caused by the stacking of phosphogypsum and coal gangue

Method used

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  • Method for reductively decomposion of ardealite by composite reducer

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: first heat reduction decomposition furnace, control temperature at 800 ℃, get the phosphogypsum powder after drying and grinding (main component: CaSO 4 .2H 2 O mass fraction is 76.69%, SiO 2 Mass fraction is 17.06%) 1000g, 100 mesh high-sulfur coal (C mass fraction is 88.72%, S mass fraction is 3.56%) 36g, 100 mesh gangue (C mass fraction is 10.02%, S mass fraction is 2.54%) 36g , after mixing evenly, send it into the decomposition furnace, and detect SO in the flue gas after the reaction starts 2 The average volume percentage content is 8.78%. After the reaction is complete, stop heating, and after natural cooling, take out the solid product for analysis and calculation. It can be calculated that the decomposition rate of phosphogypsum is 66.29%, the desulfurization rate is 59.37%, and the calcium oxide content is 55.6%. , cannot be used as a raw material for cement production.

Embodiment 2

[0029] Embodiment 2: first heat reduction decomposition furnace, control temperature at 1000 ℃, take dry and ground phosphogypsum powder 1000g, 100 mesh high-sulfur coal 36g, 100 mesh coal gangue 36g, after uniform mixing, send in the decomposition furnace, Detection of SO in the flue gas after the reaction starts 2 The average volume percentage content is 14.98%, the reaction is complete, stop heating, after natural cooling, take out the solid product for analysis and calculation, it can be calculated that the decomposition rate of phosphogypsum is 78.24%, the desulfurization rate is 83.70%, and the calcium oxide content is 69.95%. , can be directly used as raw material for cement production.

Embodiment 3

[0030] Embodiment 3: first heat reduction decomposition furnace, control temperature at 1000 DEG C, take dry and ground phosphogypsum powder 1000g, 100 mesh high-sulfur coal 18g, 100 mesh coal gangue 180g, after uniform mixing, send in the decomposition furnace, Detection of SO in the flue gas after the reaction starts 2 The average volume percentage content is 6.95%. After the reaction is complete, stop heating, and after natural cooling, take out the solid product for analysis and calculation. It can be calculated that the decomposition rate of phosphogypsum is 65.44%, the desulfurization rate is 60.82%, and the calcium oxide content is 60.38%. , cannot be directly used as raw material for cement production.

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Abstract

The invention relates to a method for adopting a compound reducing agent to reduce and decompose phosphogypsum; the method comprises the following steps of: using high-sulphur coal and coal gangue to prepare the compound reducing agent; utilizing tail gas to dry the phosphogypsum and the compound reducing agent which are ground and mixed evenly and then transferred into a reducing and decomposing furnace; carrying out reduction and decomposition till the reaction is completed. The invention makes full use of sulphur in the high-sulphur coal and the coal gangue to produce stable SO2 with high concentration and provides qualified feed gas for acid-making technique; calcium sulfate is reduced and decomposed to obtain calcium oxide slag which is taken as raw material for producing cement. The method of the invention reduces the reaction temperature and energy consumption, lowers the production cost, is beneficial to reducing energy consumption, reduces the production cost further without causing secondary pollution, thus providing a new path for the comprehensive utilization of the coal gangue and the phosphogypsum and realizing energy-saving and emission reduction. The invention also develops potential sulfur resources and can bring good economic benefit, thus forming an industry chain of circular economy for wet-process phosphoric acid enterprises.

Description

technical field [0001] The invention relates to a method for reducing and decomposing phosphogypsum by using a composite reducing agent. The method uses two kinds of solid waste phosphogypsum and coal gangue to produce high-grade cement raw materials and high-concentration SO 2 The raw material gas for producing acid from furnace gas belongs to the technical field of environmental protection and phosphorus chemical industry. Background technique [0002] my country's energy consumption is dominated by coal, and coal production has grown rapidly. From 2002 to 2007, my country's annual output of raw coal increased by 1.2 billion tons. In 2007, the annual output reached 2.54 billion tons, accounting for about 40% of the world's total. Among them, the predicted total and proven reserves of high-sulfur coal (sulfur content ≥ 3%) are 426 billion tons and 62 billion tons respectively. Due to the large amount of SO produced during the combustion of coal 2 , a serious threat to the...

Claims

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Application Information

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IPC IPC(8): C01B17/50C04B7/24
CPCY02P20/10Y02P40/10
Inventor 杨月红方祖国宁平张慧娜欧根能
Owner KUNMING UNIV OF SCI & TECH
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