Method for smelting reduction, recycling and thermal refining of titaniferous mixed slag

Abstract

The invention discloses a method for smelting reduction, recycling and thermal refining of titaniferous mixed slag. The method comprises the following steps: (1) mixing titaniferous blast furnace slag with vanadium-titanium-containing molten steel slag to form titaniferous mixed slag, and controlling the temperature of the titaniferous mixed slag within a set temperature range; (2) jetting oxidizing gas for smelting reduction and oxidization; during the process, the temperature of the titaniferous mixed slag is ensured to be within the set temperature range, and in the titaniferous mixed slag, low-valence titanium is oxidized into high-valence titanium, and iron oxide is reduced into metallic iron; and (3) carrying out separation and recycle according to different reaction devices. According to the invention, efficient recycle of the titanium component, iron component, vanadium component, phosphorus component and free calcium oxide component in the mixed slag is realized, and cold-state vanadium-titanium-iron-containing material can be treated to realize efficient comprehensive utilization of a resource; the reaction time is short, the metal recovery rate is high, the production cost is low, the raw material adaptability is high, the handing capacity is high, environment-friendliness is realized, the economic benefit is high, and the problem about efficient recycle of the metallurgy resource and thermal energy can be effectively solved.

Description

technical field [0001] The invention belongs to the field of non-blast furnace ironmaking and resource comprehensive utilization, and in particular relates to a method for smelting, reducing, recovering and quenching and tempering treatment of titanium-containing mixed slag. Background technique [0002] my country is a country rich in titanium resources, with abundant vanadium-titanium magnetite resources, mainly distributed in Panxi and Chengde. Vanadium-titanium magnetite is a compound ore in which various valuable elements such as iron, vanadium, titanium, chromium, phosphorus, copper, nickel, cobalt, scandium, niobium, zirconium, and yttrium coexist. After many years of technical research, my country has adopted the "vanadium-titanium magnetite ore dressing-blast furnace ironmaking-hot metal blowing vanadium slag-converter steelmaking" process flow, vanadium slag-sodium or calcification roasting process, to achieve the vanadium-titanium magnetite The large-scale utiliza...

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Problems solved by technology

[0021] Although the above method has obvious characteristics, it still has the following disadvantages: (1) it can only process hot slag (titanium-containing blast furnace slag and vanadium-containing titanium molten steel slag), and cannot process cold vanadium-containing titanium materials; (2) The reduced substance in the titanium-containing mixed slag (titanium-containing blast furnace slag and vanadium-containing titanium molten steel slag) oxidizes and releases heat, and the temperature of the slag is too high, which is easy to damage the heat preservation and demoulding furnace lining material and tank body, reducing its life; (3 ) in the titanium-containing mixed slag (titanium-containing blast furnace slag and vanadium-containing titanium molten steel slag) oxidizes and releases heat, the temperature of the slag is too high, the metal iron in the mixed slag accelerates oxidation to iron oxide, and the settlement of metal iron The recovery rate of metallic iron decreases; (4) the oxidation of the reduced material in the titanium-containing mixed slag releases heat, and the temperature of the slag is too high, resulting in a large waste of heat resources; (5) the recovery rate of metallic iron is low, and only the mixed slag is recovered Metal iron in the slag, without considering the reduction and recovery of iron oxides in the mixed slag; (6) The reduction and reducibility of titanium-containing blast furnace slag are not fully utilized; (7) Only the recovery of elemental vanadium in the slag is considered, There is no recovery of vanadium-containing oxides in the slag; (8) the oxygen potential of the slag is not controlled, the iron oxides in the mixed slag are partially reduced, and part of the reduced iron is re-oxidized. Therefore, the content of iron oxides in the slag is high, and it is difficult to grind; ( 9) The titanium-rich phase-perovskite phase does not settle, the amount of slag is large, and the cost of grinding, magnetic separation and gravity separation is high; (10) the phosphorus component is not recovered; (11) the slag is not quenched and tempered, Tailings utilization is limited

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