A new procedure for recycling waste tailings as cemented paste backfill to underground stopes and open pits

Hongjian Lu, Chongchong Qi, Qiusong Chen, Deqing Gan, Zhenlin Xue, Yajun Hu

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Waste tailings are increasingly being recycled as cemented paste backfill (CPB) for the cleaner production of mineral resources. In most cases, waste tailings cannot be fully recycled and the stability of underground stopes and open pits cannot be ensured. This research proposed a new procedure for recycling waste tailings as CPB to both underground stopes and open pits. Firstly, the physical, geotechnical and chemical tests required before the application of such procedure were discussed. Then, the new procedure was introduced in detail, including the process parameters determination and the backfill implementation. Finite element method and the three-zone theory were used to determine the process parameters. The application of this new procedure to an engineering instance, the Shirengou Iron Mine (SIM), was expatiated. The process parameters of recycling waste tailings as CPB in SIM were determined as follows. The solids content of CPB was 72%, the cement-tailings ratios were 1:8, 1:10, 1:20, the total height of open pit backfill was 80 m (with four backfilling stages), the stratification height was 1.5 m, and the cement-tailing ratios for four open-pit backfilling stages were 1:8 (stage 1 and 2), 1:10 (stage 3), and 1:20 (stage 4). It is shown that this new procedure achieved 100% recycling of waste tailings in SIM, which is of great environmental significance during mining operations. Harnessing such procedure extends recent efforts to recycle waste tailings as CPB, and can significantly promote the cleaner and safer production of minerals resources worldwide.

Original languageEnglish
Pages (from-to)601-612
Number of pages12
JournalJournal of Cleaner Production
Volume188
DOIs
Publication statusPublished - 1 Jul 2018

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Tailings
backfill
tailings
Recycling
Iron mines
Mineral resources
mineral resource
iron
Cements
cement
cleaner production
waste recycling
finite element method
stratification
recycling
Finite element method
engineering
Iron
Process parameters

Cite this

Lu, Hongjian ; Qi, Chongchong ; Chen, Qiusong ; Gan, Deqing ; Xue, Zhenlin ; Hu, Yajun. / A new procedure for recycling waste tailings as cemented paste backfill to underground stopes and open pits. In: Journal of Cleaner Production. 2018 ; Vol. 188. pp. 601-612.
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abstract = "Waste tailings are increasingly being recycled as cemented paste backfill (CPB) for the cleaner production of mineral resources. In most cases, waste tailings cannot be fully recycled and the stability of underground stopes and open pits cannot be ensured. This research proposed a new procedure for recycling waste tailings as CPB to both underground stopes and open pits. Firstly, the physical, geotechnical and chemical tests required before the application of such procedure were discussed. Then, the new procedure was introduced in detail, including the process parameters determination and the backfill implementation. Finite element method and the three-zone theory were used to determine the process parameters. The application of this new procedure to an engineering instance, the Shirengou Iron Mine (SIM), was expatiated. The process parameters of recycling waste tailings as CPB in SIM were determined as follows. The solids content of CPB was 72{\%}, the cement-tailings ratios were 1:8, 1:10, 1:20, the total height of open pit backfill was 80 m (with four backfilling stages), the stratification height was 1.5 m, and the cement-tailing ratios for four open-pit backfilling stages were 1:8 (stage 1 and 2), 1:10 (stage 3), and 1:20 (stage 4). It is shown that this new procedure achieved 100{\%} recycling of waste tailings in SIM, which is of great environmental significance during mining operations. Harnessing such procedure extends recent efforts to recycle waste tailings as CPB, and can significantly promote the cleaner and safer production of minerals resources worldwide.",
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A new procedure for recycling waste tailings as cemented paste backfill to underground stopes and open pits. / Lu, Hongjian; Qi, Chongchong; Chen, Qiusong; Gan, Deqing; Xue, Zhenlin; Hu, Yajun.

In: Journal of Cleaner Production, Vol. 188, 01.07.2018, p. 601-612.

Research output: Contribution to journalArticle

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