PURPOSE: To refine an Ni-contg. alloy at low cost in a short time by using an Ni raw material obtd. by pulverizing an Ni ore and subjecting it to various chemical treatment and the treatment such as roasting as an Ni source at the time of refining.
CONSTITUTION: An Ni ore such as a magnesia silicate nickel ore is pulverized to leach Fe, Mg, Ni or the like by hydrochloric acid. The leach solution is filtered and is thereafter dried and roasted. The roasted product is subjected to water leaching and is subjected to filtering and roasting treatment. The obtd. Ni raw material of the Ni ore treated product constituted of the oxide, oxychloride or the like of Fe, Mg, Ni, etc., is regulated as Ni content to refine an Ni-contg. alloy such as a stainless steel. The Ni raw material is preferably subjected to reducing and melting by a smelting reduction method or in the combination of a smelting reduction method and a scrap melting method. In this way, by using the inexpensive Ni content, the refining of the Ni-contg. alloy can be executed at low cost as well as its decarburization is promoted by oxygen from the oxide or the like to permit the refining in a short time and the component regulation in slag can furthermore be executed by the Mg component.
HASEGAWA MORIHIRO
KINUGASA MASAHIRO
