Solidification of heavy metal and production of cement clinker by lead-zinc tailings

被引：3

作者：

He, Zhexiang ^{[1
,2
]}

Xiao, Qichun ^{[1
]}

Zhou, Xiyan ^{[1
]}

Li, Xiang ^{[1
]}

Xiao, Wei ^{[1
]}

机构：

[1] Department of Environment Engineering, School of Metallurgy and Environment, Central South University, Changsha

[2] Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2015年 / 46卷 / 10期

关键词：

Cement clinker; f-CaO; Heavy metal solidification; Leaching toxicity; Lead-zinc tailings;

D O I：

10.11817/j.issn.1672-7207.2015.10.053

中图分类号：

学科分类号：

摘要：

Taking Qiaokou lead-zinc tailings as a kind of main raw materials to produce cement, the burn-ability of raw meal, the heavy metal curing, leaching toxicity and the strength of clinker were studied. The mineral phases and microstructure of cement clinker were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively, and the mass fractions of heavy metals in clinker were analyzed by the method of ICP-AES. The results show that portland cement which is in accordance with GB 175-2007 can be produced under the calcination temperature over 1 350 ℃ with 15%-16% mass fraction of lead-zinc tailings, the mass fraction of C3S reaches the maximum of 49.2%, and the compressive strength of cement in 28 d is 53.99 MPa. After incorporating the lead-zinc tailings, the mass fraction of f-CaO in clinker is less than 0.5%, and it improves the burn-ability of raw material. The averaged curing degrees of Zn, As, Cd and Pb are 89.76%, 83.62%, 73.20% and 15.19%, respectively. The leaching toxicities of As, Cd, Pb and Zn are far below the national standard of hazardous waste. © 2015, Central South University of Technology. All right reserved.

引用

页码：3961 / 3968

页数：7

共 21 条

[1]

Zhao W., Huo C., Liu M., Et al., Research progress on the comprehensive utilization of non-ferrous metal mine tailings, China Resources Comprehensive Utilization, 29, 3, pp. 24-28, (2011)

[2]

Zhou W., Sun Z., Liu H., Et al., Diagnosis of rational energy use in comprehensive utilization of lead-zinc tailings, Metal Materials and Metallurgy Engineering, 39, 2, pp. 25-28, (2011)

[3]

Stephan D., Mallmann R., Knofel D., Et al., High intakes of Cr, Ni, and Zn in clinker: Part II. Influence on the hydration properties, Cement and Concrete Research, 29, 12, pp. 1959-1967, (1999)

[4]

Dong L., Gao Q., Nan S., Et al., Performance and hydration mechanism of new super fine cemented whole-tailings backfilling materials, Journal of Central South University (Science and Technology), 44, 4, pp. 1571-1577, (2013)

[5]

Liang L., Li N., Wei L., Et al., The process conditions of cement preparation by nonferrous tailings, Multipurpose Utilization of Mineral Resources, 4, pp. 75-78, (2013)

[6]

Cui S., Lan M., Zhang J., Et al., Effect and incorporation mechanism of heavy metal elements in hazardous industrial wastes during clinker formation, Journal of the Chinese Ceramic Society, 32, 10, pp. 1264-1270, (2004)

[7]

Yang L., Li F., Guan X., Et al., Research of the impact of burning cement clinker raw ingredients on heavy metals in solidified, Journal of Henan Polytechnic University (Science and Technology), 29, 6, pp. 812-816, (2010)

[8]

Yang L., Luo S., Li F., Influence of Pb on sintering and components of cement clinker and study on its consolidation behavior, Chinese Journal of Environmental Engineering, 11, 6, pp. 4174-4178, (2012)

[9]

Wang X., Zhao Z., Li Y., Et al., The production of high strength cement clinker by using carbide slag and lead-zinc tailings, Cement, 5, pp. 17-18, (2012)

[10]

Xuan Q., Li D., Luo Z., Lead-zinc tailings applied in the production of moderate heat Portland cement, Journal of Materials Science & Engineering, 27, 2, pp. 266-270, (2009)

← 1 2 3 →