Two-step reducing carbonizing method for titanium-containing blast furnace slag

Abstract

The invention discloses a two-step reducing carbonizing method for titanium-containing blast furnace slag, and belongs to the metallurgical technical field. In order to solve the problems that an current titanium-containing blast furnace slag reducing carbonizing process is long in period, is high in power consumption, is severe in foaming and the like, the invention provides the two-step reducingcarbonizing method, and the two-step reducing carbonizing method comprises the following steps: filling molten titanium-containing blast furnace slag into an electric furnace, continuously blowing and spraying oxygen-rich reducing gas to pre-reduce, rising the temperature to 1400-1600 DEG C after pre-reducing, adding a carbon reducing agent, refining and discharging to obtain carbide slag. The method enables the first-step reduction reaction to perform in reducing gas, and guarantees that the reducing system is low-viscosity molten slag, so that reduction can be quickly completed; and when the molten slag is changed to be high in viscosity, carbonation reaction is mainly generated, so that the reducing period is short, power consumption is low, consumption on the reducing agent is low, the foaming degree is lower, and operations are more stable.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a two-step reduction carbonization method of titanium-containing blast furnace slag. Background technique [0002] Titanium-containing blast furnace slag is a major by-product of vanadium-titanium-magnetite blast furnace ironmaking. Since the industrial production of vanadium-titanium-magnetite blast furnace ironmaking has been realized, more than 50 million tons of titanium-containing blast furnace slag have been produced accumulatively. Increased at a rate of nearly 4 million tons. As an artificial titanium resource, its titanium content is high, but it is difficult to recycle, and the TiO lost from titanium-containing blast furnace slag every year 2 The total amount is more than 1 million tons. At present, researchers are actively exploring ways to extract and recover titanium from titanium-containing blast furnace slag. [0003] In the proposed method for ex...

AI Technical Summary

Problems solved by technology

Patent CN201510711318.5 Although there is a pre-reduction step of adding C before smelting in the electric furnace, the reaction in the whole process is still the direct reduction and carbonization of solid-phase carbon, and the reaction path has not been changed. Micron-sized TiC grains will still be formed, and the viscosity of the slag will increase. rapidly increase

[0004] During the high-temperature reduction carbonization process, the micron-sized TiC grains formed in the early stage of the reaction will cause the viscosity of the slag to rise sharply in the early stage of the reaction, and due to the use of carbonaceous reducing agents, the performance of slag flow and reaction gas overflow will deteriorate rapidly. The method has problems such as low reaction efficiency, long smelting cycle, high power consumption, low utilization coefficient of the electric furnace during the smelting process, serious foaming, and poor operation stability.