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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (2): 160-169.doi: 10.11872/j.issn.1005-2518.2018.02.160

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Study on Filling Cementitious Materials Based on Lead-Zinc Smelting Slag and Its Application

SHI Caixing 1，2，GUO Lijie 1，2，LI Wenchen 1，2，ZHANG Dan 1，2   

  1. 1.Beijing General Research Institute of Mining and Metallurgy Technology Group，Beijing 100260，China；2.National Center for International Joint Research on Green Metal Mining（NCGMM），Beijing 100260，China
  • Received:2017-11-08 Revised:2017-12-04 Online:2018-04-30 Published:2018-05-19

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Abstract:

In order to make full use of a large amount of solid waste and tailings from a lead-zinc mine in Guangdong Province，the filling cementitious material based on lead-zinc smelting slag was developed.Through the experimental study of mechanical activation，it is determined that the grinding time of lead-zinc smelting slag is 70 min.Through the experimental study of chemical activation，the composition of raw materials was determined as follows：smelting slag，cement，sodium silicate and gypsum.Among them，the smelting slag composition：cement clinker is 8∶2；dosage of sodium silicate is 3%，gypsum content is 8%.The concentration of filling slurry prepared by cementitious material and classified tailings is 75%，when the cement sand ratio is 1∶6，the 3 d strength is up to 2.68 MPa and 28 d strength up to 3.97 MPa，superior to the strength of filler prepared by P.O42.5 cement at a cement sand ratio of 1∶4.The diffusion test shows that the filling slurry prepared by this kind of cementitious material has better flow performance，which can meet the gravity transportation condition of the mine.SEM test results show that there are a large amount of ettringite generated inside the filling test block prepared by cementitious material of that type in early stage and a large amount of calcium silicate hydrate （C-S-H）gel generated in late period of more compact structure.

Key words: cementitious material, lead-zinc smelting slag, mechanical activation, chemical activation, strength, filling ratio, diffusion degree, curing mechanism

CLC Number: 

  • TD853 

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