Title: Experimental study on the influences of sodium sulphide on zinc tailings cement paste backfill in Huize Lead-Zinc Mine

Authors: Wei Sun; Aixiang Wu; Hongjiang Wang; Tao Li; Sizhong Liu

Addresses: Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; Chinal School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China ' Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; Chinal School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China ' Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; Chinal School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China ' Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; Chinal School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China ' Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; Chinal School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract: The universal existing features of long setting time and low early strength in zinc cement paste backfill (CPB) make the cycle of mining prolonged, the mining cost and safety risk increased. On the basis of the above work, sodium sulphide procoagulant experiments are carried out, which analyses the setting time of fill paste, different ages of uniaxial compressive strength (UCS) and hydration products change law by adding different quantity of sodium sulphide. The test results show that zinc ions have obvious retarding function and sodium sulphide has great coagulant function for fill paste which is beneficial to improve the early strength of fill paste. Setting time decreased from 128 h to18 h and the 7d UCS of fill paste increased from 0.76 MPa to 1.87 MPa with the content of sodium sulphide changed from 0% to 0.2%.

Keywords: zinc tailings; setting time; early strength; sodium sulphide; CPB; cement paste backfill; China; uniaxial compressive strength; UCS; coagulants; fill paste; underground mines; mining industry.

DOI: 10.1504/IJMME.2015.070372

International Journal of Mining and Mineral Engineering, 2015 Vol.6 No.2, pp.119 - 138

Received: 04 Nov 2013
Accepted: 06 Oct 2014
Published online: 03 Jul 2015 *

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