Experimental study on the influences of sodium sulphide on zinc tailings cement paste backfill in Huize Lead-Zinc Mine
by Wei Sun; Aixiang Wu; Hongjiang Wang; Tao Li; Sizhong Liu
International Journal of Mining and Mineral Engineering (IJMME), Vol. 6, No. 2, 2015

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%.

Online publication date: Fri, 03-Jul-2015

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