1) refractory gold ores
难选冶金矿
2) refractory gold ore
难选冶金矿石
1.
Gold can be recovered from refractory gold ore at Xingshuping, north-west by oxide roast-leaching with sulfuric acid+ calcium hypochlorite.
采用氧化焙烧 硫酸+次氯酸钙浸出工艺可从西北杏树坪地区的难选冶金矿石中回收金。
2.
By roasting mill head,then cyanide leaching the roasted ore to treat the refractory gold ores of Lufeng Gold Mine,the gold recovery rate came to 80% and the synthetic cost of ore dressing was 70$/t with better technical index and economic benefi
采用原矿焙烧—焙砂氰化浸出工艺处理鹿峰金矿难选冶金矿石 ,金的回收率达80 % ,选矿吨矿综合成本为 70元左右 ,技术指标较好 ,经济效益显著。
3) refractory
难选
1.
Test research on beneficiation of refractory oolitic hematite in hebei area;
河北某地难选鲕状赤铁矿选矿试验研究
2.
Study on extracting gold from fine-grained and disseminated refractory gold ore in a certain mine of Shanxi Province;
微细粒浸染型难选金矿石提金工艺研究
4) difficultly washabe coal
难选煤
5) refractory iron ores
难选铁矿
6) refractory mineral
难选矿
参考词条
补充资料：难夫难妻(难ｎàｎ)
一名《洞房花烛》。故事片。亚细亚影戏公司1913年摄制。郑正秋编剧，张石川、郑正秋导演。一对素不相识的青年男女，经媒婆撮合拜堂成亲，在封建礼教桎梏下开始艰难的夫妻生活。为中国第一部故事片。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。