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A method for sulfur gas reduction of gypsum to produce sulphoaluminate cement and co-production of sulfuric acid

A technology for producing sulphoaluminate and sulfur, which is applied in cement production, chemical instruments and methods, sulfur compounds, etc., can solve the problem of low decomposition rate of gypsum, achieve fast and efficient decomposition reaction, and save resources

Active Publication Date: 2022-05-20
上海三夫工程技术有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for producing sulphoaluminate cement with co-production of sulfuric acid by reducing gypsum with sulfur gas in order to overcome the above-mentioned defects in the prior art. Decompose all or most of the CaO in the sub-limestone and realize the large-scale and effective utilization of industrial waste gypsum

Method used

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  • A method for sulfur gas reduction of gypsum to produce sulphoaluminate cement and co-production of sulfuric acid
  • A method for sulfur gas reduction of gypsum to produce sulphoaluminate cement and co-production of sulfuric acid
  • A method for sulfur gas reduction of gypsum to produce sulphoaluminate cement and co-production of sulfuric acid

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Experimental program
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preparation example Construction

[0083] F. Preparation of cement

[0084] Sulphoaluminate cement products with different performance requirements are obtained by adding gypsum and composite materials to the cement clinker from the cooler in step E, and then undergoing subsequent grinding processing.

Embodiment 1

[0087] process such as figure 2 As shown, desulfurized gypsum and high-grade bauxite are used as raw materials. The raw materials are dried and ground to >95%-80μm, and most of the fly ash produced by the combustion of fuel coal in the rotary kiln enters the clinker. The chemical composition is shown in Table 1.

[0088] Table 1 Chemical composition of raw materials and raw meal

[0089]

[0090]

[0091] The above-mentioned desulfurized gypsum dihydrate and high-grade bauxite raw materials are composed in parts by mass: 76.1 parts of desulfurized gypsum dihydrate and 23.9 parts of high-grade bauxite are mixed evenly, and the raw materials are mixed evenly after drying and grinding. The obtained raw meal is metered and sent to C 1a The gas inlet of the cyclone preheater (in this embodiment, the multi-stage suspension preheating system includes 4 stages of cyclone preheaters, where C 1a is the topmost cyclone preheater), and the SO-containing 2 The hot gas is subjected...

Embodiment 2

[0101] process such as image 3 As shown, desulfurized gypsum, bauxite, fly ash, and iron slag are used as raw materials, and the raw materials are dried and ground to >95%-80μm, and most of the fly ash produced by the combustion of fuel coal in the rotary kiln enters the clinker , The chemical composition of raw materials and raw meal is shown in Table 4.

[0102] Table 4 Chemical Composition of Raw Materials and Raw Meals

[0103] project CaO SiO 2

al 2 o 3

Fe 2 o 3

MgO TiO 2

Na 2 o

SO 3

LOSS total Desulfurization gypsum 34.35 1.56 1.78 1.15 2.24 0.12 0.15 41.56 17.06 99.97 Bauxite 1.50 14.54 72.34 3.37 0.07 0.66 0.24 0.13 6.98 99.83 fly ash 1.48 43.50 35.38 1.92 0.70 1.18 0.33 0.68 14.77 99.94 iron slag 40.46 12.24 1.93 27.64 4.74 0.00 0.00 2.98 9.86 99.85 Raw material 28.19 7.02 13.33 3.40 2.03 0.26 0.16 30.51 15.10 100.00

[0104] The a...

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Abstract

The invention relates to a method for co-producing sulfuric acid from gypsum by reducing gypsum with sulfur gas, comprising the following steps: A, gas sulfur preparation; The calibration material is configured as a raw material with uniform composition; C. Preheating and pre-reduction: After the raw material is preheated, it enters the reduction furnace, where it undergoes a reduction reaction with gas sulfur, gas-solid separation, and the flue gas enters the multi-stage suspension preheating system for pre-reduction The raw meal enters the rotary kiln; D, deep reduction and clinker sintering: the reduced raw meal undergoes a deep reduction reaction in the rotary kiln, and then is sintered at high temperature to form sulphoaluminate cement clinker; E, clinker cooling, heat reuse and purification Sulfuric acid is produced, cement clinker is added with gypsum and composite materials are processed to obtain sulphoaluminate cement products with different performance requirements. Compared with the prior art, the method of the invention can not only consume a large amount of industrial waste such as industrial gypsum, but also save limestone and natural gypsum resources, and simultaneously obtain high-quality sulphoaluminate cement and industrial sulfuric acid products.

Description

technical field [0001] The invention relates to building materials and chemical products, in particular to a method for producing sulphoaluminate cement and co-producing sulfuric acid by reducing raw material containing gypsum with sulfur gas. Background technique [0002] Sulphoaluminate cement has the advantages of low alkalinity, high early strength, micro-expansion, corrosion resistance and frost resistance, and is especially suitable for use in coastal and cold areas and emergency repair projects. Traditional sulphoaluminate cement is made of calcium sulphoaluminate ( ), dicalcium silicate (C 2 S) is the main mineral phase composition, and then mixed with a small amount of gypsum and ground to obtain sulphoaluminate cement products. Compared with ordinary Portland cement, due to the reduction in the amount of raw material limestone, the firing temperature is also 100-150°C lower than that of Portland cement at 1300-1450°C. Therefore, in terms of energy consumption an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32C04B7/24C04B7/26C04B7/21C04B7/43C04B7/38C01B17/50C01B17/54C04B7/36C01B17/74
CPCC04B7/323C04B7/243C04B7/21C04B7/4407C04B7/38C04B7/475C01B17/506C01B17/50C01B17/54C04B7/367C01B17/745C01B17/74Y02P20/10Y02P20/129
Inventor 张国兴陈延信庞仁杰赵博韩丁张志远
Owner 上海三夫工程技术有限公司
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