Lime is widely used in the beneficiation or recovery of non - ferrous metal ores 石灰广泛运用在有色金属矿的选矿或者还原上。
2.
The first category includes crude oil , natural gas , coal , other non - metal ores , ferrous metal ores and non - ferrous metal ores while the second includes solid salt and liquid salt 矿产品包括原油、天然气、煤炭、其他非金属矿原矿、黑色金属矿原矿和有色金属矿原矿;盐包括固体盐和液体盐两种。