Low-calcium silicate cement produced by using waste slag of aluminum and method of producing the same

A calcium silicate and aluminum waste slag technology, applied in cement production, clinker production and other directions, can solve the problem of high energy consumption in small and medium-sized cement enterprises, and achieve the effects of small one-time investment, low energy consumption and high mechanical strength

Inactive Publication Date: 2009-07-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a low-calcium Portland cement produced by using aluminum waste slag to produce cement clinker formula in order to solve the probl

Method used

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  • Low-calcium silicate cement produced by using waste slag of aluminum and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put the aluminum waste slag into the heat exchanger, use the tail gas produced by the cement plant to heat and dry for 30 minutes to remove the contained water. Contain 82.5% limestone (calcium carbonate content 75%), 8.9% anhydrous aluminum profile waste slag, 10.6% steel mill steel slag mass ratio to prepare raw meal according to raw meal, add it to pulverizer. Crush to 200 mesh. The resulting powdery raw meal is then added to a cement rotary kiln and fired at a temperature of 1450° C. for 20 minutes. Add 3.1% gypsum and 1% calcium carbonate to the fired clinker, then add it into a ball mill, and ball mill it to 250 mesh. You can get the product.

Embodiment 2

[0023] Put the aluminum waste slag into the heat exchanger, use the tail gas produced by the cement plant to heat and dry for 40 minutes to remove the contained water. The raw meal is prepared according to the mass ratio of 70% medium-grade limestone (calcium carbonate content 75%), 9.0% anhydrous aluminum waste slag, and 21% steel plant slag in the raw meal, and is added to the pulverizer. Crush to 200 mesh. The resulting powdery raw meal is then added to a cement rotary kiln and fired at a temperature of 1350° C. for 45 minutes. Add 4.5% gypsum and 1.5% calcium carbonate to the fired clinker, then add it into a ball mill, and ball mill it to 250 mesh. You can get the product.

Embodiment 3

[0025] Put the aluminum waste slag into the heat exchanger, use the tail gas produced by the cement plant to heat and dry for 50 minutes to remove the contained water. The raw meal is prepared according to the mass ratio of 70% medium-grade limestone (calcium carbonate content 75%), 9.0% anhydrous aluminum waste slag, and 21% steel plant slag in the raw meal, and is added to the pulverizer. Crush to 200 mesh. The resulting powdery raw meal is then added to a cement rotary kiln and fired at a temperature of 860° C. for 150 minutes. Add 4.5% gypsum and 3% calcium carbonate to the fired clinker, then add it into a ball mill, and ball mill it to 250 mesh. get the product

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Abstract

The invention discloses a low-calcium silicate cement produced by using aluminum waste slag and a preparation method thereof. The low-calcium silicate cement comprises the following components in percentage by weight: 65 to 85 percent of limestone, 6 to 10 percent of the aluminum waste slag, and 9 to 25 percent of steel slag or iron slag. The method for preparing the low-calcium silicate cement comprises the following steps: (1) drying and treating the aluminum waste slag so as to dehydrate the aluminum waste slag; (2) adding the dehydrated aluminum waste slag, the limestone and the steel slag into a crusher according to the proportion, and crushing the materials; (3) adding the crushed materials into a cement rotary kiln, and heating and calcining the materials; and (4) adding a ball milling assistant into the sintered clinker, and ball-milling and packaging the mixture to obtain the low-calcium silicate cement. Compared with the prior cement, the low-calcium silicate cement produced by using the industrial wastes as the aluminum waste slag has higher mechanical strength, simultaneously has the characteristics of simple process, low sintering temperature and energy consumption of a unit product, and high rate of finished products, and is suitable for industrial popularization because the prior equipment is directly used.

Description

technical field [0001] The invention relates to a low-calcium Portland cement produced by using aluminum waste slag and a preparation method thereof. Background technique [0002] With the development of industry and the improvement of people's living standards, aluminum alloys have been widely used in various industries. As of 2006, the output of aluminum profiles in my country was 3 million tons. Data show that a coloring production line with an annual output of 2,400 tons produces 2,000 tons of waste residue per year. Then, the waste slag produced by the aluminum profile industry in my country is about 3 million tons every year. It is expected that this number will continue to increase with the rapid development of my country's construction industry. At present, landfill is basically used, which not only wastes limited land resources, but also causes environmental pollution. [0003] Along with the development of the construction industry, my country's cement output ha...

Claims

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Application Information

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IPC IPC(8): C04B7/147
CPCC04B7/147C04B28/082C04B2111/1056Y02P40/10Y02P40/121C04B7/425C04B7/434C04B22/10C04B22/143
Inventor 潘湛昌徐慎颖肖楚民魏志钢
Owner GUANGDONG UNIV OF TECH
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