Method for preparing high-concentration sulfur dioxide gas from industrial byproduct gypsum slag

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

Active Publication Date: 2021-06-15
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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  • Method for preparing high-concentration sulfur dioxide gas from industrial byproduct gypsum slag
  • Method for preparing high-concentration sulfur dioxide gas from industrial byproduct gypsum slag

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Embodiment Construction

[0030] The present invention will be further described in detail below with reference to the specific embodiments.

[0031] A method of preparing high concentration of sulfur dioxide gas in an industrial by-product stone slag, wherein the steps of sequentially comprising the steps of the gypsum slag and the catalyst and the decomposition auxiliary agent to obtain a preheater, and the raw material enters the leader of the kiln tail system. After preheating, in the decomposition furnace of the kiln tail system, the reducing agent is added to the decomposition furnace to decompose the gypsum in the raw material to the intermediate phase, and then the intermediate phase enters the rotary kiln, the intermediate phase is in the rotary kiln. Get clinker; cooling, dust grinding, adding reinforcing fibers and water, stir well, molding, carbonizing, and obtaining artificial stone. Catalysts, decomposition auxiliaries, reducing agents, formulations of the heat source of the decomposition fur...

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Abstract

The invention discloses a method for preparing high-concentration sulfur dioxide gas from industrial by-product gypsum slag, and the method comprises the following steps: uniformly mixing the industrial by-product gypsum slag with a catalyst and a decomposition aid, introducing a reducing agent into a decomposition furnace of a kiln tail system to decompose the gypsum slag to obtain an intermediate phase, and reacting the intermediate phase in a rotary kiln to obtain clinker; cooling and grinding the clinker, adding reinforced fibers and water, uniformly performing stirring, performing forming, performing carbonizing and performing curing to obtain the artificial stone. Compared with the prior art, the method is low in production cost, high in production efficiency and good in product quality.

Description

Technical field [0001] The present invention relates to the field of resource utilization of industrial waste, and is specifically related to the use of industrial by-product stone cream. Background technique [0002] Industrial by-product stone paste slag is mainly one of industrial by-product plaster, dry detholio ash or solid sulfur slag. [0003] Gypsum is a sulfate mineral, its chemical molecular formula is CASO 4 XH 2 O. Gypsum is divided into natural plaster and industrial by-product gypsum. At present, industrial by-product gypsum raw materials are primarily phosphate, desulfurized gypsum, titanium plaster, and a small amount of fluoride, citrate plaster, salt plaster, etc. Dry desulfurization ash, primarily of calcium sulfate, using a grade residue obtained by disintegrating a high humidity absorption tower and sulfur dioxide in the flue gas, which is easily formed to form calcium sulfate in the medium temperature oxidation environment. Sulfur Sliration Sulfur Slide is a...

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Application Information

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Patent Type & Authority Applications(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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