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Process for smelting low-silicon ferrotitanium by fusing titanium-containing blast furnace slag

A blast furnace slag and silicon-titanium technology, which is applied in the field of utilizing molten titanium-containing blast furnace slag to produce low-silicon ferro-titanium, can solve the problems of high process cost, large amount of residue, and little improvement in reduction efficiency, and achieve stable process parameters and high process efficiency. The process is simple and beneficial to the effect of separation

Active Publication Date: 2017-11-28
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] my country is rich in titanium resources, the largest reserves in the world, mainly in the vanadium-titanium magnetite in Panxi area, and its utilization rate is very low. The main reason is that only vanadium and iron are recovered in blast furnace ironmaking, and titanium enters blast furnace slag in the form of titanium dioxide ( The mass fraction is about 25%), forming complex mineral phases, difficult to recycle
At present, 70 million tons have been accumulated in the slag factory, and it is still increasing at a rate of 3 million tons every year, occupying land, polluting the environment, and wasting resources. If the titanium-containing blast furnace slag can be well utilized, it will be of great significance to the utilization of titanium resources in my country.
[0003] Many domestic scientific and technological workers have done a lot of research on the utilization of titanium-containing blast furnace slag, mainly focusing on the following methods: 1) Using it to prepare cement, if it can be successfully applied, it is necessary to reduce the TiO in blast furnace slag 2 content, otherwise the cement activity is poor and easy to crystallize; 2) Wet titanium extraction, mainly acid and alkali treatment to prepare titanium dioxide, has the disadvantages of large acid and alkali consumption, large amount of residue, environmental pollution and corrosion of equipment; 3) high temperature carbonization and low temperature Chlorination to prepare TiCl 4 The disadvantage is that CaCl with high boiling point and high viscosity is easily formed during the chlorination process. 2 and MgCl 2 , so that the chlorination equipment cannot operate normally for a long time; 4) High-temperature titanium enrichment, enriching the dispersed titanium into perovskite or black ore, and selecting rich titanium ore by mineral processing, this method is actually very difficult Realization; 5) to produce titanium alloy, use aluminum, silicon and other elements to reduce titanium in the slag to prepare titanium alloy. Although this method has achieved some results, three key problems have not been solved. The first is that the process cost is high and the smelting time is long , high power consumption, large amount of reducing agents such as aluminum and silicon
Second, the content of impurities such as silicon and aluminum in the preparation of titanium alloys is high, and the steel types that can be used in the alloying process are limited.
The third is the use of residues after titanium extraction and environmental pollution.
However, what the author ignores is that TiO in titanium-containing blast furnace slag 2 and SiO 2 The content of aluminum is more than 20%, the reduction ability of aluminum is much stronger than that of silicon, and its reduction of TiO 2 and SiO 2 The capacity is similar. Titanium and silicon in the molten titanium-containing blast furnace slag are simultaneously reduced by aluminum. Using silicon-aluminum iron as the reducing agent does not improve the reduction efficiency much, but results in high silicon content in the preparation of titanium alloys.

Method used

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  • Process for smelting low-silicon ferrotitanium by fusing titanium-containing blast furnace slag
  • Process for smelting low-silicon ferrotitanium by fusing titanium-containing blast furnace slag

Examples

Experimental program
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Effect test

Embodiment 1

[0017] 1) Prepare materials according to the mass ratio of slag: aluminum iron: calcium oxide = 100:37.94:10, weigh 200g of titanium-containing blast furnace slag, 75.88g of aluminum-iron alloy, wherein the aluminum content is 50%, calcium oxide 20g, spare, the percentage is the mass percentage;

[0018] 2) Crushing and grinding the aluminum-iron alloy to a size greater than or equal to 300 mesh, adding calcium oxide mixture for 2 hours, so that the calcium oxide is uniformly coated on the powder surface;

[0019] 3) Put the titanium-containing blast furnace slag into the magnesia crucible, coat the crucible with graphite to protect it, put it into the MoSi2 resistance furnace, raise the temperature to 1450°C with the furnace, and change it to automatic constant temperature control. After the slag is melted, the depth of the molten pool is about 55mm. The ingredients mixed in step 2 are evenly added into the molten pool through the rotary feeding device above the crucible. The...

Embodiment 2

[0023] 1) Prepare materials according to the mass ratio of slag: aluminum iron: calcium oxide = 100:37.94:13, weigh 300g of titanium-containing blast furnace slag, 113.82g of aluminum-iron alloy, wherein the aluminum content is 50%, and 39g of calcium oxide, and set aside.

[0024] 2) Crushing and grinding the aluminum-iron alloy to a size greater than or equal to 300 mesh, adding calcium oxide mixture for 2 hours, so that the calcium oxide is uniformly coated on the powder surface;

[0025] 3) Put the titanium-containing blast furnace slag into the magnesia crucible, cover the crucible with graphite to protect it, put it into the MoSi2 resistance furnace, raise the temperature to 1550°C with the furnace, and change it to automatic constant temperature control. After the slag is melted, the depth of the molten pool is about 80mm, and the ingredients mixed in step 2 are evenly added into the molten pool through the rotary feeding device above the crucible, and the feeding speed ...

Embodiment 3

[0029] 1) Prepare materials according to the mass ratio of slag: aluminum iron: calcium oxide = 100:37.94:15, weigh 400g of titanium-containing blast furnace slag, 151.76g of aluminum-iron alloy, wherein the aluminum content is 50%, and 60g of calcium oxide, and set aside.

[0030] 2) Crushing and grinding the aluminum-iron alloy to a size greater than or equal to 300 mesh, adding calcium oxide mixture for 2 hours, so that the calcium oxide is uniformly coated on the powder surface;

[0031]3) Put the titanium-containing blast furnace slag into the magnesia crucible, cover the crucible with graphite to protect it, put it into the MoSi2 resistance furnace, and change the temperature to automatic constant temperature control with the furnace rising to 1600 °C. After the slag is melted, the depth of the molten pool is about 110mm, and the ingredients mixed in step 2 are evenly added into the molten pool through the rotary feeding device above the crucible, and the feeding speed is...

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Abstract

The invention discloses a process for smelting low-silicon ferrotitanium by fusing titanium-containing blast furnace slag. The process comprises the following steps: preparing slag, ferro-aluminium and calcium oxide in a mass ratio of 100 to 37.94 to (10-15); crushing ferroaluminum alloy, grinding the ferroaluminum alloy into powder with particles sizes which are more than or equal to 300 meshes, adding calcium oxide, mixing a calcium oxide mixture until the surface of the ferroaluminum alloy powder is uniformly coated; putting the titanium-containing blast furnace slag into a magnesia crucible, putting the magnesia crucible into a resistance furnace, carrying out furnace heating to 1450-1650 DEG C, and carrying out constant-temperature control; uniformly adding the mixed material into a fusion tank in a speed of 4.5g / min-5.5g / ml, and after the adding, maintaining the temperature for 5-10 minutes; taking out the material at 1450-1650 DEG C, carrying out water cooling, and drying; and separating slag and alloy by virtue of a mechanical method. According to the process, the particle size of the ferroaluminum alloy powder is more than 300 meshes; and meanwhile, by controlling the adding speed so as to control the reduction reaction time of aluminum and silicon, so that the reduction efficiencies of aluminum and silicon are improved, the consumption of the ferroaluminum alloy powder is reduced, the contentsof silicon and residual aluminum in the alloy is reduced, the process cost is lowered, and the silicon decrease and the titanium increase in the alloy are realized.

Description

technical field [0001] The invention belongs to the technical field of blast furnace slag utilization, in particular to a technology for utilizing molten titanium-containing blast furnace slag, which uses molten titanium-containing blast furnace slag to produce low-silicon ferro-titanium. Background technique [0002] my country is rich in titanium resources, the largest reserves in the world, mainly in the vanadium-titanium magnetite in Panxi area, and its utilization rate is very low. The main reason is that only vanadium and iron are recovered in blast furnace ironmaking, and titanium enters blast furnace slag in the form of titanium dioxide ( The mass fraction is about 25%), forming complex mineral phases, which is difficult to recycle. At present, 70 million tons have been accumulated in the slag factory, which is still increasing at a rate of 3 million tons every year, occupying land, polluting the environment, and wasting resources. If the titanium-containing blast fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C22C1/02C22C14/00C22C33/04C22C38/14
CPCC21B3/06C22C1/02C22C14/00C22C33/04C22C38/14C21B2200/00Y02W30/50
Inventor 康磊尚德礼廖相巍吕春风康伟贾吉祥唐雪峰张维维张杰
Owner ANGANG STEEL CO LTD
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