Reduction and utilization method of dedusting ash of stainless steel

Abstract

The invention relates to a reduction and utilization method of dedusting ash of stainless steel, comprising the following steps of: (1) preparing materials: uniformly stirring and mixing raw materials into a mixed material according to following proportions: 90-95 dedusting ash, 2-4 reducing agent and 3-6 bonding agent; (2) extrusion formation: pressing the mixed material into dedusting ash pressure balls; (3) maintaining: naturally drying and maintaining the dedusting ash pressure balls, wherein the measured intensity of the pressure balls is 2420N / each ball-2820N / each ball; (4) sintering: adding the dedusting ash pressure balls into a rotary kiln, sintering at 650+ / -50 DEG C for no less than 20 minutes, and discharging; (5) preparing materials for an electric furnace according to the following proportions: 70-80 stainless steel waste steel, 35-40 high-carbonferrochrome, 40-45 pig iron containing chromium and nickel, 3-5 dedusting ash pressure balls, 6-8 slag former and 0.3-0.5 reducing agent; and (6) melting: adding the prepared materials into the electric furnace for melting, and tapping when the temperature and the components of the molten steel meet the requirement. The reduction and utilization method of the dedusting ash of stainless steel has the advantages of low cost and little pollution to the environment.

Description

technical field [0001] The utility model relates to a method for reducing and utilizing stainless steel dust. Background technique [0002] The dedusting ash produced by stainless steel smelting contains a certain amount of Fe, Cr, Ni oxides, CaO, MgO and other components. The main components (typical values) are shown in Table 1: [0003] Table 1 [0004] TF FeO% CaO% MgO% SiO 2 % Cr 2 o 3 % NiO% ～34 ～9.0 ～13.0 ～1.0-2.0 ～6.0 ～13.0-18.0 ～2.5-4.0 [0005] It can be seen from Table 1 that the oxide content of Fe, Cr and Ni contained in stainless steel dedusting ash is relatively high, which has high utilization value. Now the commonly used method of utilization is electric furnace or shaft furnace melting reduction to produce chromium-containing nickel Semi-steel, blast furnace reduction technology and direct pelletizing / briquetting methods. Reduction production of chromium-nickel pig iron b...

AI Technical Summary

Problems solved by technology

Reduction production of chromium-nickel pig iron with electric furnace or shaft furnace has high cost, high requirements for equipment, energy and environmental protection, and serious environmental pollution

Blast furnace reduction technology has high requirements on equipment, energy, and environmental protection, causing serious environmental pollution

Direct pelletizing / briquetting method, inconvenient and difficult to use the product, high conversion cost in the later stage, unstable metal recovery rate