Melting of nickel laterite and sulfur-bearing Ni c

专利名称：Melting of nickel laterite and sulfur-bearing

Ni concentrate in making Ni-alloyed iron andstainless steel

发明人：Kundrat, David M.申请号：EP97119622.5申请日：19971110公开号：EP0846778A1公开日：19980610

摘要：A multiple stage process for obtaining Ni units from Ni laterite ores and sulfur-bearing Ni concentrates during production of nickel-alloyed iron, nickel-alloyed steel ornickel-alloyed stainless steel in a reactor equipped with top- and bottom-blowing means.Dried Ni laterite ore is charged into an iron/slag bath mixture containing dissolved carbonand a metalloid reductant such as aluminum or silicon. The laterite ore is melted whileheat is generated by oxidation of the metalloid and carbon in the reactor. After thelaterite ore is melted, top-blowing of pure oxygen and bottom-blowing of an oxygen-containing gas are ceased. Bottom injection of an inert stirring gas is begun. A sulfur-bearing Ni concentrate and aluminum are added to the bath. Sulfur from the sulfur-bearing Ni concentrate is transferred to and held within the slag produced from thelaterite ore by controlling slag composition and temperature, degree of mixing of theiron/slag bath mixture by the inert gas and the carbon/metalloid concentration in thebath mixture. The sulfur-containing slag then is discharged from the reactor and the ironbath mixture is decarburized and refined to alloy specification. The extent of

desulfurization by the slag determines the amount of sulfur-bearing Ni concentrate that

can be added to the bath for a given slag weight. Total slag weight throughout theprocess should be within the range of 200 to 300 kg slag/MT bath mixture, thetemperature of the bath should be maintained between 1500-1700°C, the slag basicityshould be controlled between 1-3 and the compositions of AlO and MgO in the slagshould be maintained between 10-25 wt.% and 10-20 wt.% respectively.

申请人：ARMCO INC.

地址：705 Curtis Street Middletown, Ohio 45044-3999 US

国籍：US

代理机构：Beetz & Partner Patentanwälte

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