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A method for preparing high-concentration sulfur dioxide gas from industrial by-product gypsum slag

A technology for industrial by-products of gypsum and sulfur dioxide, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of unfavorable low-cost production of sulfuric acid and low concentration of sulfur dioxide, and achieve the effect of improving decomposition efficiency and promoting decomposition

Active Publication Date: 2022-01-28
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0009] At present, the method of preparing sulfur dioxide by decomposing gypsum is to use coal as fuel and air as combustion-supporting gas. Since a large amount of nitrogen in the air does not participate in combustion support, the concentration of sulfur dioxide in the generated flue gas is low, which is not conducive to the low cost of sulfuric acid in the subsequent process. Production

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  • A method for preparing high-concentration sulfur dioxide gas from industrial by-product gypsum slag
  • A method for preparing high-concentration sulfur dioxide gas from industrial by-product gypsum slag

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[0030] The present invention will be described in further detail below in conjunction with specific examples.

[0031] A method for preparing high-concentration sulfur dioxide gas from industrial by-product gypsum slag, which is characterized in that it includes the following steps in sequence: the gypsum slag is uniformly mixed with a catalyst and a decomposition aid to obtain raw meal, and the raw meal enters the preheater of the kiln tail system After medium preheating, it enters the calciner of the kiln tail system, and at the same time, a reducing agent is added to the calciner to decompose and react the gypsum in the raw material to obtain an intermediate phase, and then the intermediate phase enters the rotary kiln, and the intermediate phase reacts in the rotary kiln Obtaining clinker; cooling and grinding the clinker, adding reinforcing fibers and water, stirring evenly, forming, carbonizing and curing, to obtain artificial stone. See Table 1 for the formula of cataly...

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Abstract

This patent discloses a method for preparing high-concentration sulfur dioxide gas from industrial by-product gypsum slag. The industrial by-product gypsum slag is evenly mixed with catalyst and decomposition aid, and a reducing agent is introduced into the decomposition furnace of the kiln tail system to decompose the gypsum slag. The intermediate phase is obtained, and the intermediate phase is reacted in a rotary kiln to obtain clinker; the clinker is cooled, ground, added with reinforcing fibers and water, stirred evenly, formed, carbonized and maintained, and artificial stone is obtained. Compared with the existing technical solutions, the method has low production cost, high production efficiency and good product quality.

Description

technical field [0001] The invention relates to the field of resource utilization of industrial waste slag, in particular to the utilization of industrial by-product gypsum slag. Background technique [0002] Industrial by-product gypsum slag is mainly one of industrial by-product gypsum, dry desulfurization ash or sulfur-fixing slag. [0003] Gypsum is a sulfate mineral with the chemical formula CaSO 4 ·xH 2 O. Gypsum is divided into natural gypsum and industrial by-product gypsum. At present, the raw materials of industrial by-product gypsum are mainly phosphogypsum, desulfurization gypsum, titanium gypsum, and a small amount of fluorine gypsum, citrate gypsum, salt gypsum, etc. Dry desulfurization ash mainly contains calcium sulfite. The ash obtained by desulfurization of slaked lime and sulfur dioxide in flue gas in a high-humidity absorption tower is easy to generate calcium sulfate in a medium-temperature oxidation environment. Sulfur-fixing slag is the waste slag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/50C01B32/55
CPCC01B17/506C01B32/55
Inventor 谭宏斌马小玲杨飞华董发勤张吉秀李玉香邓秋林王进明王进王军霞贺小春李芳
Owner SOUTHWEAT UNIV OF SCI & TECH
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