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High alite silicate cement clinker and its preparation method

A technology for Portland cement and cement clinker, which is applied in the field of Portland cement clinker with high alite content and its preparation, can solve the problem of limited cement application, deterioration of cement durability, environmental pollution by sulfide and fluoride, etc. problems, to achieve the effect of improving durability, saving cost and energy consumption, and low alkali content

Inactive Publication Date: 2008-10-29
NANJING TECH UNIV
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  • Claims
  • Application Information

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Problems solved by technology

To achieve this purpose, mineralizers are usually added, such as phosphorus-containing compounds and fluorine-containing compounds (see Chen Yimin, Guo Suihua, Guan Zongfu, Qin Shouwan, CN200410074411.1), or sulfur-containing compounds to promote the formation of alite minerals , the strength of the obtained clinker will be relatively high, but the sulfide and fluoride produced in the production process will pollute the environment
Clay is generally used as raw material in production, and the alkali content of clay in the northern region is high, so the alkali content of the obtained cement clinker will be high, which will make the durability of cement worse and limit the application of cement

Method used

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  • High alite silicate cement clinker and its preparation method
  • High alite silicate cement clinker and its preparation method
  • High alite silicate cement clinker and its preparation method

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Embodiment 1

[0024] Shaanxi Xiushan Cement Co., Ltd. uses limestone, lead-zinc tailings, shale and iron ore as raw materials to prepare raw cement. The chemical composition of lead-zinc tailings and shale is shown in Table 1-1. Minerals in lead-zinc tailings are mainly quartz and calcite, etc. Minerals in shale are mainly quartz, mica, kaolinite and wurstite. The ratio of each raw material is shown in Table 1-2, in which all the data are in mass percentage. The designed clinker rate and mineral composition are listed in Table 1-3, where KH is the lime saturation coefficient, SM is the silicic acid rate, IM is the aluminum rate, C 3 S refers to tricalcium silicate (3CaO SiO 2 ), C2 S refers to dicalcium silicate (2CaO SiO 2 ), C 3 A refers to tricalcium aluminate (3CaO·Al 2 o 3 ), C 4 AF refers to tetracalcium aluminoferrite (4CaO·Al 2 o 3 · Fe 2 o 3 ), R 2 O refers to the alkali content. Mix and grind the raw material evenly until the sieve of 0.08mm is less than 10%, put it in...

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Abstract

The present invention relates to a high-alite content Portland cement clinker prepared by using lead-zinc tails and shale instead of clay and its preparation method. Its composition includes (by wt%) 78-87% of limestone, 6-19% of lead-zinc tails, 2-11% of shale and 0-1.7% of iron ore. Said invention also provides the concrete steps of its preparation method.

Description

Technical field: [0001] The invention relates to a cement clinker and a preparation method thereof, in particular to a Portland cement clinker with high Alite content, which uses lead-zinc tailings and shale instead of clay, and a preparation method thereof. Background technique: [0002] my country's lead-zinc tailings are large and widely distributed. When discharged, they not only occupy a large amount of farmland, but also pollute water sources with harmful dissolved substances. However, they have not been widely used at present, and are generally discharged as waste residues in stockyards. Although the chemical composition of lead-zinc tailings from different origins is not the same, a large proportion of the oxide components are similar to cement raw materials, and some trace components have mineralization or fluxing properties for the calcination of cement. Therefore, it can be used in the cement industry, as long as it is within the reasonable transportation radius o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/02
Inventor 李东旭许仲梓兰祥辉朱建平范洪喜宫晨琛
Owner NANJING TECH UNIV
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