Method for preparing ilmenite by ilmenite carbothermic-electrolysis

A technology of ferro-titanium and ilmenite, which is applied in the field of electrochemical metallurgy, can solve the problems of lack of consideration of cost, energy consumption, and environmental protection, and achieve the effects of reducing electrolysis energy consumption, low process energy consumption, and low cost

Active Publication Date: 2019-06-21
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To sum up, there are many methods for the preparation of ferro-titanium alloys, but each of them has its own advantages and disadvantages, and lacks a simple and effici

Method used

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  • Method for preparing ilmenite by ilmenite carbothermic-electrolysis
  • Method for preparing ilmenite by ilmenite carbothermic-electrolysis

Examples

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Effect test

Embodiment 1

[0025] Chenggang ilmenite sand and coke are ball milled and mixed at a molar ratio of 2:1, and then added to CaO-Al at 1700°C 2 o 3 In the molten electrolyte, the electrolysis starts after keeping warm until the coke is globally oxidized. Under the protection of argon, the graphite anode is immersed in the electrolyte, the cathode conductive rod is inserted into the molten iron obtained by carbothermal reduction, and the molten iron is used as the cathode. Using constant current electrolysis process, the cathode current density is 1A / cm 2 , the anode current density is 0.5A / cm 2 , Electrolyzed to 20% titanium content in molten iron to stop electrolysis. The liquid titanium-iron alloy is discharged through the iron tap, and the temperature is lowered to room temperature under the protection of argon to obtain a low-titanium-iron alloy product. figure 1 It is the schematic diagram of carbothermal reduction-electrolysis of ilmenite in this example.

Embodiment 2

[0027] The ilmenite sand in Panzhihua area is mixed with coal according to the molar ratio of 2:1, and then added to CaO-Al at 1600°C 2 o 3 -In the CaF molten electrolyte, keep warm until the coal is oxidized globally and start electrolysis. Under the protection of argon, the graphite anode is immersed in the electrolyte, the cathode conductive rod is inserted into the molten iron obtained by carbothermal reduction, and the molten iron is used as the cathode. Using constant current electrolysis process, the cathode current density is 0.5A / cm 2 , the anode current density is 0.25A / cm 2 , Electrolyze until the titanium content in the molten iron is 50% and stop the electrolysis. The liquid titanium-iron alloy is discharged through the iron tap, and the temperature is lowered to room temperature under the protection of argon to obtain a medium titanium-iron alloy product.

Embodiment 3

[0029] Ilmenite sand and coke in Panzhihua area were mixed by ball milling at a molar ratio of 3:1, and then added to CaO-Al at 1800 °C 2 o 3 In the molten electrolyte, the electrolysis starts after keeping warm until the coke is globally oxidized. Under the protection of argon, the graphite anode is immersed in the electrolyte, the cathode conductive rod is inserted into the molten iron obtained by carbothermal reduction, and the molten iron is used as the cathode. The constant voltage electrolysis process is adopted, the electrolysis voltage is 5V / cm, and the electrolysis is stopped when the content of titanium element in the electrolyte is as low as 0.1%. And add the mixture of ilmenite and coke to the electrolysis again to continue the carbothermal-electrolysis cycle until the electrolysis is stopped when the titanium content in the molten iron reaches 80%. The liquid titanium-iron alloy is discharged through the iron tap, and the temperature is lowered to room temperatu...

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Abstract

The invention discloses a method for preparing ilmenite by ilmenite carbothermic-electrolysis, and belongs to the field of electrochemical metallurgy. The method for preparing ilmenite by the ilmenitecarbothermic-electrolysis comprises the steps that ilmenite and reducing agent carbon are evenly mixed in proportion, and then the mixture is placed into molten oxide electrolyte; carbothermic reduction is carried out on the ilmenite in the electrolyte to obtain molten iron; graphite or inert electrode is used as anode, a graphite rod or an inert metal rod is inserted into the molten iron as cathode, and a constant potential or constant current method is adopted for electrolysis; electrochemical deposition is carried out on the cathode molten iron after electrolysis to obtain ferrotitanium alloy products; after the content of iron and titanium in the electrolyte is reduced to a certain value, a mixture of the ilmenite and the reducing agent carbon is added to the electrolyte again for thenext cycle; and when the titanium content in the molten iron increases to a certain amount or reaches the required ferrotitanium alloy ratio, the liquid ferrotitanium alloy products are discharged through a tapping hole in the bottom of a crucible, and the next cycle is continued. The method for preparing the ilmenite by the ilmenite carbothermic-electrolysis has the characteristics of short flow, simple operation, low equipment requirement, high titanium element recovery rate in the ilmenite, no waste residue and waste water, green and cleanness.

Description

technical field [0001] The invention relates to a method for extracting ferro-titanium alloy by carbothermal-electrolysis of ilmenite, which belongs to the field of electrochemical metallurgy, and can specifically realize low-cost, short-flow, green and clean preparation of ferro-titanium alloy. Background technique [0002] Ferro-titanium alloys have the characteristics of high melting point, high hardness, and high density, and are widely used in hydrogen storage materials, deoxidizers and alloy additives in the steelmaking process. As a deoxidizer, the deoxidation ability of ferro-titanium alloy is much higher than that of silicon, manganese and other common deoxidizers in steelmaking. As an alloy additive, the titanium element in the ferro-titanium alloy can combine with the carbon element in molten steel to form a stable compound, thereby fixing the interstitial carbon element and improving the performance of the steel. In addition, in the production of stainless steel...

Claims

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Application Information

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IPC IPC(8): C25C3/28C25C3/34
Inventor 焦树强王明涌蒲正浩焦汉东朱骏
Owner UNIV OF SCI & TECH BEIJING
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