产品类别:五金配件 | 品牌:乐雅 | 规格:96/128mm |
型号:7003 | 可否定做:可以 | 贸易属性:内贸 |
是否工厂:是 |
品牌:乐雅
产品型号:7003
类型:欧式仿古
涌入:橱柜,衣柜,抽屉,厨房,办公室等家具;
颜色:亮光青古(亮光红古)/真金/砂银金等
孔距:96/128mm
制造商:温州乐雅五金制品有限公司
更多信息:
锌矿:Zinc Mining
80% of zinc mines are located underground, 8% are of the open pit type, with the remainder a combination of both. In terms of production volume, underground mines account for as much as 64% of overall zinc production, combined underground/open pit mines provide 21%, and the remaining 15% is sourced from open pit mines.
Rarely is the ore, as mined, rich enough to be used directly by smelters; it needs to be concentrated. Zinc ores contain 5-15% zinc. To concentrate the ore it is first crushed and then ground to enable optimal separation from the other minerals. Typically, a zinc concentrate contains about 55% of zinc with some copper, lead and iron. Zinc concentration is usually done at the mine site to keep transport costs to smelters as low as possible.