Method for preparing sulphoaluminate cement and coproducing sulfuric acid by reducing gypsum with sulfur gas

A technology for producing sulfoaluminate and sulfur, which can be used in cement production, chemical instruments and methods, sulfur compounds, etc., and can solve the problem of low decomposition rate of gypsum

Active Publication Date: 2020-08-21
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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  • Method for preparing sulphoaluminate cement and coproducing sulfuric acid by reducing gypsum with sulfur gas
  • Method for preparing sulphoaluminate cement and coproducing sulfuric acid by reducing gypsum with sulfur gas
  • Method for preparing sulphoaluminate cement and coproducing sulfuric acid by reducing gypsum with sulfur gas

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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 preparing sulphoaluminate cement and coproducing sulfuric acid by reducing gypsum with sulfur gas. The method comprises the following steps: A, preparing gaseoussulfur; B, burdening: preparing dehydrated gypsum, bauxite, a siliceous correction material and an iron correction material into a raw material with uniform components; C, preheating and pre-reducing:preheating the raw material, feeding the preheated raw material into a reduction furnace, performing reduction reaction on the preheated raw material and the gaseous sulfur, performing gas-solid separation, feeding flue gas into a multistage suspension preheating system, and feeding the pre-reduced raw material into a rotary kiln; D, carrying out deep reduction and clinker sintering: performing adeep reduction reaction on the reduced raw material in the rotary kiln, and then performing high-temperature sintering to form sulphoaluminate cement clinker; and E, cooling the clinker, recycling heat, purifying to prepare sulfuric acid, adding gypsum and a combined material into the cement clinker, and processing to obtain sulphoaluminate cement products with different performance requirements.Compared with the prior art, the method has the following advantages: a large amount of industrial waste residues such as industrial gypsum can be consumed, limestone and natural gypsum resources canbe saved, and meanwhile, high-quality sulphoaluminate cement and industrial sulfuric acid products can be obtained.

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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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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