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Method for producing cement by utilizing high-silicon low-calcium limestone

A high-silicon, low-calcium and limestone technology is applied in the field of using high-silicon and low-calcium limestone to produce cement, which can solve the problems of insufficient and insufficient, and achieve the effects of reducing the cost of raw materials, reducing environmental pollution, and adjusting in a timely manner.

Inactive Publication Date: 2012-01-04
SINOMA TIANSHAN YUNFU CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, any single method is not enough to utilize the above-mentioned low-grade and inferior limestone ore
Simply adopting a single method is not enough to directly use the pre-proportioned raw meal for calcination

Method used

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  • Method for producing cement by utilizing high-silicon low-calcium limestone
  • Method for producing cement by utilizing high-silicon low-calcium limestone
  • Method for producing cement by utilizing high-silicon low-calcium limestone

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Embodiment Construction

[0048] Such as figure 1 As shown in the schematic flow chart, taking a production line with a daily output of 5000 tons of cement as an example, the method for producing cement of the present invention includes basic processes such as material preparation, crushing, grinding, storage, homogenization, calcination, storage and aging, and the basic equipment includes: Stockyards, storage warehouses, crushers, mills, rotary kilns, clinker warehouses, cement warehouses and gamma-ray instruments, etc. Raw materials include 3 kinds of limestone, shale, iron ore and raw coal, as well as auxiliary materials and active additives. There are 3 types of limestone in the raw material, namely limestone A, limestone B, and limestone C. Among them, limestone A is matched with limestone, which is a conventionally used limestone, that is, limestone that reaches grade II ore, with a CaO content of 46% to 48% by weight, and is generally considered to have low silicic acid rate (SM) and high alum...

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Abstract

The invention relates to a method for producing cement by utilizing high-silicon low-calcium limestone. The cement comprises the following raw materials in percentage by weight: 48 to 50 percent of low-grade high-silicon limestone with CaO content between 42 and 45 percent and f-SiO2 content between 10 and 18 percent, 31 to 33 percent of high-magnesium limestone, 16 to 18 percent of matched limestone, 3 to 6 percent of shale and 2 to 4 percent of ironstone. The method is technology which utilizes low lime saturation ratio and ore of high silicon rate and high alumina rate and has an attributeof low silica modulus; online detection is performed on the mixture ratio of the raw materials by using a gamma ray instrument and a formula is adjusted by using one minute as a cycle; and a plate hammer counterpunch type crusher is used for crushing, a roller-type vertical grinding mill is used for grinding and waste gas at the tail of a kiln is used for drying the raw materials. The method has the advantages of capability of developing and utilizing low-grade limestone resource, accurate material burdening, timely regulation of the mixture ratio, and capability of reducing homogenization facilities and storage yard; and high quartziferous rock ore can be used in vertical milling and has high grindability. The method is suitable for utilizing high-dissociative silicon low-calcium limestone.

Description

technical field [0001] The invention relates to a cement production method, in particular to a cement production method using low-grade limestone containing high free silicon and low calcium. technical background [0002] Portland cement clinker is produced by vertical kiln, rotary kiln, etc., usually limestone is used as the main raw material, and clay, iron powder, minerals and anthracite are mixed according to the ratio. The traditional process usually uses high-grade limestone with high CaO content, generally above 46%. According to the relevant national technical specifications, the quality of limestone suitable for cement production requires CaO ≥ 45% and free silicon dioxide f-SiO 2 ≤6%. With regard to the chemical composition in the raw meal formula, the weight percentage of CaO is required to reach about 65%. my country is a country with large limestone resources, the total reserves are quite considerable, but the distribution is extremely uneven, concentrated in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/36
Inventor 朱新贤王军梅沈欣朱太新阎德明
Owner SINOMA TIANSHAN YUNFU CEMENT
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