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Method for rapid reduction and smelting of titanium-containing slag

A titanium slag and reduction furnace technology is applied in the field of rapid reduction and smelting of titanium-containing slag, which can solve the problems of uneven mixing of reducing agent and molten slag, long feeding time of reducing agent, low conversion rate of titanium carbide, etc., so as to save power consumption for conversion. , the reduction reaction is fast, the heat loss is small

Active Publication Date: 2017-09-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the melting and heating time of the existing method for reducing titanium-containing slag is long, the time for adding the reducing agent is long, the mixing of the reducing agent and the slag is uneven, the smelting cycle is long, and the conversion rate of titanium oxide into titanium carbide low power consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The titanium-containing slag 15t that this embodiment handles, TiO 2 The content is 24%, and the rest are oxides of silicon, calcium, magnesium and aluminum.

[0031] An electric furnace with a capacity of 30 tons is connected behind the slag outlet of the titanium-containing slag, and the molten titanium-containing slag flowing out of the slag outlet flows into the electric furnace through the slag ditch. There is a uniform distributor near the slag outlet of the titanium-containing slag above the slag ditch. When the titanium-containing slag flows into the slag ditch, open the distributor, and add 1.1t of anthracite with a particle size of 1-10mm to the flowing slag, and then add it to the reduction electric furnace . Power transmission and temperature rise, the reduction temperature is 1500 ℃ ~ 1630 ℃, after 60 minutes of reduction, start to spray 1.65t of anthracite coal powder with a particle size of less than 1mm. The side blowing method is used for continuous i...

Embodiment 2

[0035] 25t of titanium-containing slag processed in this embodiment, TiO in the slag 2 The content is 33%, and the rest are oxides of silicon, calcium, magnesium and aluminum.

[0036] A 12500KVA submerged arc furnace is connected behind the slag outlet of this kind of slag, and the hot molten slag is fed into the submerged arc furnace through the rotary chute. A reducing agent silo is arranged at the entrance of the rotary chute. When the titanium-containing slag flows into the chute, the valve of the silo is opened, and coke 2.1t with a particle size of 1-6mm is added to the hot slag through the feeding pipe, and the hot slag mixes and flows into the mine. in a hot oven. Power transmission and temperature rise, reduction temperature 1550°C-1620°C, controlled heating of titanium-containing slag for 150 minutes, the liquid level of slag no longer rises, and after the concentration of CO in the flue gas is stable, 3.2t of coke powder with a particle size of less than 2mm is in...

Embodiment 3

[0040] The titanium-containing slag 5t that this embodiment handles, its TiO 2The content is 15%, and the rest are oxides of silicon, calcium, magnesium, and aluminum.

[0041] In the reduction furnace, 360kg of bituminous coal with a particle size of 3-8mm is preliminarily added as a reducing agent through a rotary chute. Transfer the titanium-containing slag just out of the furnace to the reduction furnace through a ladle or a slag pot, power on to raise the temperature, the reduction temperature is 1550°C-1650°C, control the heating of the titanium-containing slag for 15 minutes, and start spraying steelmaking additives with a particle size of 0.5-1.5mm. Carbon agent 900kg. The top blowing method is used for continuous injection, the spray gun is set on the furnace cover, and the injection carrier gas is Ar 2 , The injection speed is 45-50kg / min, the injection and post-reaction time are controlled for 30 minutes, and the slag is discharged after power failure.

[0042] A...

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Abstract

The invention belongs to the field of titanium smelting, and particularly relates to a method for quick reduction smelting of titaniferous furnace slag. The technical problems that in an existing titaniferous furnace slag reduction method, the smelting warm-up time is long, the time spent in adding reducing agents is long, the reducing agents and smelting slag are mixed unevenly, the smelting period is long, the transformation rate that titanic oxide is transformed into titanium carbide is low, and electric consumption is high are solved. According to the scheme for solving the technical problems, the method for quick reduction smelting of the titaniferous furnace slag comprises the following steps that a, a reducing agent and hot titaniferous furnace slag just discharged out of a furnace are mixed and then added into a reduction furnace together, and pre-reduction is carried out at the temperature of 1,500 DEG C-1,650 DEG C; b, after pre-reduction, temperature is raised to 1,600 DEG C-1,750 DEG C, the reducing agent is replenished, and high-temperature reduction smelting is further carried out; and c, after smelting is finished, heating is stopped, slag is discharged, and titanium carbide furnace slag is obtained. According to the method, in the whole process, heat losses are small, the reduction reaction is fast, time is short, and energy consumption is low.

Description

technical field [0001] The invention belongs to the field of titanium metal smelting, in particular to a method for rapidly reducing and smelting titanium-containing slag. Background technique [0002] Titanium is a rare metal with light weight, high strength, metallic luster and strong corrosion resistance. In the process of using vanadium-titanium magnetite metallurgy, some titanium-containing metallurgical slags will be produced, such as titanium-containing blast furnace slag, direct reduction slag, etc., the titanium in these slags (as TiO 2 Total) is usually around 15% to 35%. Due to the high titanium content, these slags are usually not suitable for making building materials, cement, etc. In order to avoid environmental pollution and resource waste caused by stacking, these slags must be recycled. [0003] For the recovery and utilization of titanium resources in these slags, one is to prepare titanium dioxide by acid treatment, but due to the high content of impurit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/12C22B7/04
CPCY02P10/20
Inventor 赵青娥张继东杨仰军程晓哲李良黄家旭周玉昌王东生王唐林
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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