摘要:
通过对冬瓜山铜矿半自磨顽石力学性质、粒度组成的测定、不同尺寸顽石作磨矿介质和顽石与钢球不同配比的磨矿对比试验及工业试验展开对处理半自磨顽石工艺的应用研究.实验室试验表明,顽石硬度和韧性均比原矿高,较适合做中矿再磨介质;-80+40 mm粒级顽石做为磨矿介质时磨矿产品过粉碎较少,中间粒级-37+10 μm含量较多,磨矿效果较好;顽石与钢球质量配比在1:1到3:1之间时,磨矿产品粒度要求可以保证.工业试验结果表明,半自磨顽石处理工艺应用后再磨溢流中-0.010 mm含量比工业试验前降低1.34个百分点,半自磨机台时处理量比试验前提高了6.64 t/h,中矿再磨单耗由0.50 kg/t降为0.20 kg/t,铜的回收率比试验前提高0.32个百分点;顽石作铜再磨介质用量7.2 t/h,约占顽石量的25%,与半自磨机中+40 mm顽石产出量相近.因此引出+40 mm顽石做中矿再磨介质,不仅解决半自磨顽石积累问题,同时提高半自磨处理量和铜的回收率,降低再磨过粉碎含量和磨矿单耗.
关键词:
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顽石
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半自磨
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处理量
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铜矿
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碎磨工艺
Abstract:
A systematic research on the mechanical properties and size characteristics of semi-autogenous pebble in Dongguashan Copper Mine, grinding contrast tests of different sizes of pebble as grinding media and different ratio of pebble and steel balls as well as the industrial test on processing semi-autogenous pebble were conducted.Experimental tests results showed that hardness and toughness of pebble were higher than those of raw ore and thus suitable for regrinding medium;the productivity of over grinding was less and easy select fraction of-37+10 mm was more when the-80+40 mm pebble was used as grinding medium;the requirements of particle size of the grinding product could be guaranteed with the proportion of pebble and steel ball from 1:1 to 3:1.The industrial test results showed that after applying the process, the-0.010 mm fraction was reduced by 1.34 percentage points;the capacity of semi-autogenous mill was increased by 6.64 t/h than before;regrinding ball consumption was reduced from 0.50 kg/t to 0.20 kg/t, the copper recovery rate increased 0.32 percentage points than before;the medium consumption of copper grinding was 7.2 t/h, accounting for about 25% of the amount of pebble and similar to the amount of +40 mm pebble in semi-autogenous mill.Therefore, one can conclude that using +40 mm pebble as regrinding medium, not only solved the semi-autogenous pebble accumulation but also improved the semi-autogenous mill capacity and copper recovery, and reduced over grinding amount and regrinding consumption as well.
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