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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  • Summary
  • 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 o

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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Example Embodiment

[0083] F. Preparation of cement

[0084] The cement clinker from the cooler in step E is added with gypsum and composite materials, and then subjected to subsequent grinding processing to obtain sulfoaluminate cement products with different performance requirements.

Example Embodiment

[0086] Example 1:

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

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

[0089]

[0090]

[0091] Mix the above-mentioned dihydrate desulfurized gypsum and high-grade bauxite raw materials in parts by mass: 76.1 parts of dihydrate desulfurized gypsum and 23.9 parts of high-grade bauxite. The raw materials are mixed evenly after drying and grinding. The raw meal obtained is measured and sent to C 1a The gas inlet of the cyclone preheater (the multi-stage suspension preheating system in this embodiment includes a 4-stage cyclone preheater, where C 1a Is the top cyclone preheater), and the SO-containing furnace from the rotar...

Example Embodiment

[0100] Example 2

[0101] Process flow such as image 3 As shown, desulfurized gypsum, bauxite, fly ash, and iron slag are used as raw materials. The raw materials are dried and ground to >95%-80μm. Most of the fly ash produced by the combustion of the rotary kiln fuel coal 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 meal

[0103] project CaOSiO 2

[0104] The above-mentioned dihydrate desulfurized gypsum, high-grade bauxite, fly ash, and iron slag raw materials are composed by weight: 72.7 parts of dihydrate desulfurized gypsum, 12.9 parts of high-grade bauxite, 7.2 parts of fly ash, and iron slag 7.2 parts of the batching plan is mixed evenly. After the raw materials are dried and ground, the mixture is homogenized, and the raw materials are measured and sent to C 1a The gas inlet of the cyclone preheater and the SO-containing gas from the rotary kiln and convey...

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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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