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Research on the Characteristics of the Raw Materials in the Area of Changzhi in Shanxi Province and Proportioning Design

Author: SunYuLong
Tutor: LiFuZhou; HuLiMin
School: Wuhan University of Technology
Course: Materials Processing Engineering
Keywords: burnability f-CaO mineralizer sulfur-alkali ratio buildups jam
CLC: TQ172.61
Type: Master's thesis
Year: 2012
Downloads: 33
Quote: 0
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Abstract


There are many steel companies and thermal power plants in the area of Changzhi in Shanxi province where is rich in coal and steel, resulting in abundant resources of slag and fly ash, and whose prices are low. Using slag and fly ash to produce cement clinker, can not only meet the production requirements of the cement plants, but also help local steel companies and thermal power plants to solve the problems of slag and fly ash accumulations of pollution to the surrounding environment. Through this way, cement plants can achieve good economic, environmental and social benefits, which may be called "kill two birds with one stone." Different raw materials have different influences on raw meal, thus, characteristics of the raw materials in the area of Changzhi and proportioning design were studied, which can guide local cement plants using slag and fly ash to product and provide a theoretical basis for improve yield and quality of cement clinker and reduce energy consumption.This paper analyzed the characteristics of the representative cement raw materials in the area of Changzhi and did proportioning designs. The burnability of different cement raw meals which mixed by different raw materials were studied on the condition of same modulus value of clinker and burning system. The research results indicate that steel slag can substitute for iron ore to be used to product clinker, which can also significantly improve the burnability of raw meal and reduce energy consumption. Fly ash can take place of the clay in clinker production, which can also reduce power consumption of raw meal grinding and heat consumption of drying. A significant proportion scheme is proposed and applied in industrial production.The effects of fluoride and sulphate mineralizer (FS) and lead-zinc slag on the burnability of the raw meal by experiments were studied. The research results indicate that FS mineralization can significantly improve the burnability of the raw material and lower sintering temperature. We advised that the mixing amount of the CaF2is1.2%and the F/S ratio controlled between1.0and1.2in the industrial production. The lead-zinc slag can also significantly improve the burnability of the raw meal, dropping liquid phase appearance temperature of clinker burning and promote the absorption of free lime(f-CaO)and the formation of silicate minerals. However, it may has the opposite effect with the mixing amount over a certain value, so we proposal the dosage be about2%and below4%. Based on the research results of this paper, ZY cement plant4000t/d of clinker production line used local steel slag and fly ash instead of iron and clay to product cement clinker, which made the heat consumption (3010kJ/kg.cl) and power consumption (63kWh/t.cl) achieved internal advanced level. Through the analysis of the industrial trial production, we drew some conclusions. Firstly, the right sulfur-alkali ratio (S/R) has an important meaning on the stability of kiln system and continuous production. The disorder of S/R can lead to problem of incrustation and blocking in preheating system. Secondly, high sulfur coal cannot be used to regulate the low S/R in kiln system. But desulfurization ash can make S/R close to1, which can reduce the chances of incrustation and blocking. Thirdly, due to differences of chemical and mineral composition, different steel slag and fly ash have different effects on the burnability of the raw material and the heat consumption of clinker and the power consumption of raw meal grinding. Fourthly, the combustible sulfur of coal cause the problem of buildups jam easily. As long as its content is in the reasonable control range, sulfur in the form of sulphate plays the role of mineralizer in sintering process of clinker, which can improve the burnability of the raw material and the heat consumption of clinker.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Cement Industry > Production process and equipment > Pretreatment of raw materials ( processing and ingredients )
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