Authors: Zhang, G; Yang, Z; Wang, YQ, Gao, Q

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Zhang, G, Yang, Z & Wang, YQ, Gao, Q 2014, 'Application of research on a new cementing material for full-tailings backfill in the layered filling mining method at the Gaoguanying Iron Mine', in Y Potvin & T Grice (eds), Mine Fill 2014: Proceedings of the Eleventh International Symposium on Mining with Backfill, Australian Centre for Geomechanics, Perth, pp. 251-258,

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A new kind of binding material made from tailings powder (named KWF) was invented and put into practice by the authors based on the stage subsequent-filling method in Sijiaying Iron Mine. To adapt KWF to Gaoguanying Iron Mine with upward-layered cut-and-fill mining method, the authors analysed the tailings’ particle size distribution, adjusted KWF's suitability to this mine, compared different binding materials test results on pure cement and other cementitious material under the same conditions in order to compare with those of KWF. The results showed that full-tailings backfill strength mixed with KWF is 1.3-1.6 times higher than that with cement and 1.7-1.9 times higher than that with the other cementitious material. Since the tailings at Gaoguanying mine contains more fine grains and higher clay content, full-tailings filling strength mixed by KWF cannot meet the required design strength (mine requirement strength). Therefore, further optimisation trials were done to modify KWF compositions. New compositions are quicklime 3.5%, hemihydrate gypsum 15% and admixture 1.5%. The corresponding seven day cured fill mix unconfined compressive strength (UCS) reached 1.43 MPa. With 1.5% early strength agent added, the full-tailings KWF fill mix’s strength increased to 1.54 MPa, which fully meets the design strength for a safe layered backfill method at Gaoguanying Iron Mine.

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