Study on Safety and Efficient Mining Scheme for Low Grade Nickel Ore Under Complex Mining Conditions
Received date: 2022-10-16
Revised date: 2022-11-22
Online published: 2023-03-27
In the upper middle section of West No.2 mining area of Longshou mine，it is necessary to adopt the non-pilar sublevel caving method within the range of ore body with a height of less than 70 m to achieve safe，efficient and low loss mining of low grade ore resources，the ore mining conditions are very complex.In view of these key technical problems，the research was carried out one by one.Firstly，a technical scheme for the formation of overburden by inducing caving of large volume cemented backfill was proposed.At the same time，the mechanical properties，structural characteristics and caving ability of cemented backfill were studied，the results show that backfill has good collapsibility.Secondly，the fragmentation degree of cemented backfill was studied by means of field investigation and physical experiment.The results show that although the strength of cemented backfill is small，it will not produce a large amount of powder after the initial caving and secondary crushing during ore drawing，and the average block size of cemented backfill is greater than the average block size of the ore falling from the fan-shaped blasthole.Therefore，the caving cemented backfill will not lead to the premature dilution of the ore.Subsequently，a combined ore drawing scheme was proposed for the only four stoping sections in the caving stope，and the effectiveness of the scheme was studied by physical ore drawing experiments.The experimental results show that the ore recovery rate of the scheme can reach 85.4%，while the dilution rate is only 6.5%.Finally，the above research results were applied to the field production practice，and the roof cementation backfill was successfully induced to fall naturally to form a covering layer with a thickness of about 30 m.While ensuring the ore recovery rate in the stope，the dilution rate is controlled within 10%，so that the stope productivity is increased by 30%，the mining cost is reduced by 28%，and the safe，efficient，low loss，and low-cost mining of low-grade ore in the West No.2 mining area was realized under complex mining conditions.
Baohui TAN , Yongding WANG , Zhigui ZHANG , Weiguo LONG , Bin LI , Jianyuan HE , Zhen GONG . Study on Safety and Efficient Mining Scheme for Low Grade Nickel Ore Under Complex Mining Conditions[J]. Gold Science and Technology, 2023 , 31(1) : 88 -101 . DOI: 10.11872/j.issn.1005-2518.2023.01.146
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