Method for producing alloy steel by directly utilizing low-grade nickel-chromium commensal iron ore

Abstract

The invention discloses a method for producing alloy steel by directly utilizing low-grade nickel-chromium commensal iron ore. In the method, the low-grade nickel-chromium commensal iron ore comprising 0.5 to 2.5 percent of Ni, 0.5 to 4 percent of Cr and 5 to 60 percent of TFe is taken as a raw material and is added with a desulfurizer, and the nickel, chromium and iron in the ore are metalized into nickel-chronium alloy iron blocks in a pot-type furnace by non-coking metallurgy technology of heating and directly reducing by mill coal, coal gas or natural gas; and the nickel-chronium alloy iron blocks are processed in various modes to form the high-quality alloy steel. The method for producing the alloy steel by directly utilizing the low-grade nickel-chromium commensal iron ore is a new process for producing multiple kinds of alloy steel by directly utilizing the commensal iron ore comprising 0.5 to 2.5 percent of Ni, 0.5 to 4 percent of Cr and 5 to 60 percent of TFe, and has the advantages of short flow, low energy and material consumption, reduction of production line project investment and production cost, and improvement of economic and social benefits of enterprises.

Description

technical field [0001] The invention relates to an alloy steel smelting method, in particular to a method for directly utilizing low-grade nickel-chromium symbiotic iron ore to produce alloy steel. Background technique [0002] Nickel and chromium are essential alloy additives for smelting stainless steel, heat-resistant steel and other alloy steels. Depending on ore types, grades and user requirements, nickel metallurgical products usually include pure nickel electro-nickel, nickel shot, nickel block, nickel ingot, nickel powder, etc., and non-pure nickel sintered nickel oxide and ferronickel; chromium has Metal chromium, micro-carbon ferrochrome, low-carbon ferrochrome, medium-carbon ferrochrome, high-carbon ferrochrome and other products. [0003] However, the grades of nickel and chromium ore are generally relatively low, and domestic resources are in short supply, requiring large quantities of imports; the traditional production process of metal nickel and chromium is ...

AI Technical Summary

Problems solved by technology

[0006] One of the main methods of smelting ferronickel with laterite ore is the blast furnace method, which has high energy consumption and serious pollution, and must use coke as the main energy source

Coke is mainly refined with coking coal, but coking coal resources are scarce, consumption is large, and coking production is seriously polluted, and the cost of thorough treatment is huge

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