Ferroalloy refining: after 1920, in order to meet the high quality stainless steel and silicon calcium quality new development needs to begin a new stage production of low-carbon ferro-alloys. On the one hand, the process based Goldschmidt proposed thermite 1898 Preparation of metal on the development of the aluminum smelting some hot carbon-iron alloy and pure metal; on the other hand developed oxide in an electric furnace silicon alloy Desilication refining method. Ferroalloy refining: in addition, the production of pure electric solution alloy additives (such as metal manganese), and the production of carbon-containing vacuum decarbonization ultra low carbon ferrochrome. Also developed several years refining ferrochrome, ferromanganese Methods oxygen blowing method. China around 1940 production of ferrosilicon, ferromanganese with a small electric stove. Quality new Si-Ca | The new Si-Ca | metallurgy greatly greatly by Anyang metallurgical Refractories Limited. Anyang greatly metallurgical Refractories Co., Ltd. (www.aydawei.com) (www.aydwyjgs.com) strong, credible, in Anyang ferroalloy products and other industries and has accumulated a large number of loyal customers. The company better work attitude and constantly improve greatly innovative ideas will lead metallurgy and you hand into the brilliant, for a better future!