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Method for preparing sulphoaluminate cement clinker by using red mud and phosphogypsum

A technology of sulfoaluminate cement and phosphogypsum, which is applied in the field of cement clinker production, can solve the problems of unsatisfactory product quality, unsatisfactory sulfoaluminate cement clinker cannot meet the needs of actual use, and the amount of phosphogypsum is small, and the like, Achieve the effect of low production cost, good product quality and simple production process

Inactive Publication Date: 2013-01-02
贵州省建筑材料科学研究设计院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current research direction is mainly to use phosphogypsum to produce load-bearing bricks, sulfuric acid co-production cement, sulphoaluminate cement, concrete expansion agent, cement retarder, gypsum block, etc., while in the existing sulfuric acid co-production cement, The amount of phosphogypsum used in the production of sulphoaluminate cement, concrete expansion agent, and cement retarder is generally very small, and the quality of its products is not ideal
Therefore, the existing method of producing sulphoaluminate cement clinker by utilizing red mud and phosphogypsum still cannot meet the needs of actual use

Method used

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  • Method for preparing sulphoaluminate cement clinker by using red mud and phosphogypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Red mud (sintered red mud), phosphogypsum, bauxite, and limestone are used as raw materials for production, and each raw material is dried and ground to obtain raw meal below 180 mesh, calculated by weight , respectively take 10 parts of red mud, 16.5 parts of phosphogypsum, 33 parts of bauxite, and 40.5 parts of limestone in each raw meal, mix the raw materials together and put them into the rotary kiln, and heat them at a temperature of 1250 ° C to 1350 ° C After sintering for 15 to 50 minutes, the kiln is quickly released, and the sintered raw materials are quenched in the air to obtain the finished product of sulphoaluminate cement clinker; Mud; in order to achieve better product quality, when using a rotary kiln to calcine raw meal, a conventional desulfurization device can be installed in the traditional way at the kiln tail of the conventional rotary kiln, which can better treat the raw meal. The red mud is dealkalized.

Embodiment 2

[0011] Example 2: Red mud (Bayer process red mud), phosphogypsum, bauxite, and limestone are used as raw materials for production, and each raw material is dried and ground to obtain a raw meal below 180 mesh, calculated by weight , respectively take 14.22 parts of red mud, 18.21 parts of phosphogypsum, 29.15 parts of bauxite, and 38.42 parts of limestone in each raw meal. After sintering for 30 to 50 minutes, the kiln is quickly released, and the finished product of sulphoaluminate cement clinker can be obtained after rapid cooling; the red mud used is the Bayer process red mud in the prior art; in order to achieve better product quality When using a rotary kiln to calcine the raw meal, a conventional desulfurization device can be installed at the kiln tail of the conventional rotary kiln in a traditional way, so that the red mud in the raw meal can be dealkalized better.

Embodiment 3

[0012] Example 3: Using red mud (a mixture of sintering red mud and Bayer red mud), phosphogypsum, bauxite, and limestone as production raw materials, each raw material was dried and ground to obtain 180 For the raw meal below the order, calculated by weight, take 14 parts of red mud, 15 parts of phosphogypsum, 35 parts of bauxite, and 42 parts of limestone in each raw meal, mix each raw meal together and put it into the rotary kiln , and sintered at a temperature of 1250°C to 1350°C for 15 to 50 minutes, and then quickly exit the kiln, so that the sintered raw materials can be rapidly cooled in the air, and the finished sulphoaluminate cement clinker can be obtained; the red used in it The mud is a red mud mixture obtained by mixing sintering red mud and Bayer red mud in the prior art. In the red mud mixture, the ratio is calculated in parts by weight: 20-60 parts of sintering red mud, 20-60 parts of Bayer red mud 30 to 50 parts of red mud. In this example, the same amount ...

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Abstract

The invention discloses a method for preparing a sulphoaluminate cement clinker by using red mud and phosphogypsum. According to the invention, red mud, phosphogypsum, bauxite, and limestone are adopted as production raw materials; the materials are respectively dried by baking, and are grinded, such raw materials with sizes below 180 meshes are obtained. According to the weight, 8-20 parts of the red mud raw material, 12-20 parts of the phosphogypsum raw material, 25-40 parts of the bauxite raw material, and 35-50 parts of the limestone raw material are mixed, and the mixture is placed in a rotary kiln; sintering is carried out for 30-50min under a temperature of 1250-1350 DEG C; the material is fetched rapidly, such that the sintered raw material is rapidly quenched in the air, and the sulphoaluminate cement clinker finished product is prepared. According to the invention, large amounts of industrial solid wastes such as red mud and phosphogypsum are effectively utilized as production materials. The method also has the advantages of good quality, simple preparation process, low preparation cost, and the like.

Description

technical field [0001] The invention relates to a method for producing sulphoaluminate cement clinker by utilizing red mud and phosphogypsum, and belongs to the technical field of cement clinker production. Background technique [0002] Red mud (Red Mud) is the waste produced in the process of extracting alumina from bauxite. It is named for its red mud and is the largest source of pollution in alumina plants. At present, the world produces about 60 million tons of red mud every year, and my country's red mud discharge is more than 4 million tons per year. With the commissioning of new plants and the increase and transformation of old plants, the total amount of red mud is on the rise. For the treatment of red mud, most alumina factories at home and abroad stack the red mud in the storage yard, build dams for wet storage, and rely on natural sedimentation to separate and return the solution for reuse, which will easily cause a large amount of waste lye to penetrate into the ...

Claims

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Application Information

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IPC IPC(8): C04B7/43C04B7/32
Inventor 万军汤忠刚王勇彭能华贾韶辉张保如邵力
Owner 贵州省建筑材料科学研究设计院有限责任公司
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