Process for directly producing austenitic stainless steel by utilizing oxide nickel

Abstract

The invention relates to a technological process for stainless steel smelting, in particular to a process for directly producing austenitic stainless by utilizing oxide nickel. The process has the following advantages: oxide nickel of various grades is adopted to obtain different ingredients of molten nickel iron by smelting in a blast furnace and a submerged arc furnace, an electric arc furnace is cancelled as a melting unit, the chemical heat of the molten iron is utilized to melt all or part of chromium and manganese alloy, and a bottom-blowing argon-oxygen converter is utilized to dephosphorize so as to improve the dephosphorization efficiency of molten chromium iron and the obtainment yield of chromium, thereby the following series and trademarks of products, i.e. 200 series of 201, 202, J4, and the like, 300 series of 304,304L, 316,321,329, and the like, are produced; and meanwhile, all links in the whole production flows are organically combined, and various energy sources, such as coal gas, steam, afterheat, and the like are fully utilized and recycled, thereby the energy consumption is low, the secondary waste gas discharge amount not great, the production cost and the raw material cost are low, and the investment and the occupied area are not great.

Description

technical field [0001] The invention relates to a stainless steel smelting process technology, in particular to a production process for directly producing austenitic stainless steel using laterite nickel ore. Background technique [0002] Laterite nickel ore is an iron ore containing nickel and chromium, which accounts for 70% of the world's nickel resources. In laterite nickel ore deposits, the composition of each chemical composition of laterite nickel ore at different deposit locations will also vary, and the smelting and processing methods of laterite nickel ore with different components are also different. [0003] The uppermost layer of the lateritic nickel deposit is a nickel-containing chromium limonite. The composition of this nickel-containing chromium limonite is: TFe: 48-52%, Ni: 0.5-1%, Cr 2 o 3 : 2-5%, MgO: 0.5-5%. Due to the low nickel content, in the prior art, this ore is used to produce low-nickel-chromium blast furnace molten iron through blast furnace...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, this production process of utilizing nickel-containing chromite ore to produce stainless steel has the following disadvantages: one is that nickel-chromium blast furnace molten iron and refined nickel-iron molten iron are cast into blocks, and then melted in an electric arc furnace, which increases the smelting process. Second, alloys such as nickel-iron pig iron, high-carbon ferrochrome, and nickel-iron are melted in electric furnaces, resulting in high alloy loss; third, repeated investment in secondary smelting equipment; fourth, increased secondary emissions, polluting the environment; fifth, existing Some chromium and nickel alloy production and stainless steel production are independent, and the production of chromium and nickel alloy is not completely suitable for the production of stainless steel, especially low-nickel-chromium pig iron with nickel-containing chromium limonite as raw material and red clay Refined ferronickel with nickel ore as raw material can only be used for the production of 200 series low austenitic stainless steel and 300 series stainless steel respectively, and it is difficult to use them in cross-use. It is necessary to design stainless steel production processes and production equipment for different nickel-chromium pig irons. So not the most economical

Images