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Method for comprehensively utilizing vanadium and titanium resources of vanadium titano-magnetite

A vanadium-titanium magnetite, vanadium-titanium technology, applied in metallurgy and chemical industry, can solve the problems of polluted environment, low recovery rate, heavy pollution, etc.

Active Publication Date: 2021-04-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The existing vanadium-titanium-magnetite vanadium resource utilization process mainly has the following problems: (1) During the blast furnace smelting process, about 30% of the vanadium enters the titanium-containing blast furnace slag, and this part of the vanadium resource has not been effectively utilized at present
Sodiumized vanadium extraction tailings have high sodium content and calcified vanadium extraction tailings have high sulfur content, both of which are difficult to return to the blast furnace smelting process, resulting in a large amount of solid hazardous waste and polluting the environment
(3) The traditional sodium / calcification vanadium extraction process is mainly a wet process, accompanied by a large amount of ammonia nitrogen wastewater, which brings serious environmental pollution problems
The upgrading of titanium slag has the problems of high energy consumption and low recovery rate
Moreover, the upgraded titanium slag can only be used as raw material for sulfuric acid process titanium dioxide
If the process of "high-temperature carbonization / nitridation-low-temperature chlorination" is used to treat 50 or 70 titanium slag, although the reaction temperature can be reduced, a large amount of heat will be released during the low-temperature chlorination of high-grade carbon / titanium nitride, and the reactor The problem of heat transfer is difficult to solve
[0007] To sum up, the existing vanadium-titanium-magnetite vanadium resource utilization has the problems of long process, heavy pollution and large amount of tailings
The utilization of titanium resources has the problems of high energy consumption, long process and low yield
Moreover, the extraction of vanadium and titanium is carried out in two different process systems, the process is lengthy and the operation is complicated

Method used

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  • Method for comprehensively utilizing vanadium and titanium resources of vanadium titano-magnetite

Examples

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Effect test

Embodiment 1

[0045] combine figure 1 , a method for comprehensive utilization of vanadium-titanium-magnetite vanadium-titanium resources used in this embodiment, comprising cyclone preheating process 1, fluidized bed pre-reduction process 2, electric furnace melting process 3, vanadium blowing process 4, cooling and crushing Process 5, granulation and screening process 6, fluidized chlorination process 7, refining vanadium removal process 8, oxidation treatment process 9 and ferrovanadium smelting process 10, the method is carried out according to the following steps:

[0046] 1) The vanadium-titanium magnetite is sent to the cyclone preheating process 1 to exchange heat with the high-temperature fluidized bed flue gas from the fluidized bed pre-reduction process 2, and the vanadium-titanium magnetite after heat exchange is sent to the fluidized bed pre-reduction process 2. The tail gas from the cyclone preheating process is sent to environmental protection treatment;

[0047] 2) In the f...

Embodiment 2

[0056] This embodiment adopts the method for the comprehensive utilization of vanadium-titanium-magnetite vanadium-titanium resources described in Example 1. In the fluidized bed pre-reduction process 2, the operating temperature is 600 ° C, the reducing gas is blast furnace gas, and the metallization rate is 10%. . The solid reducing agent in the electric furnace melting process 3 is coal powder, the operating temperature is 1400° C., the amount of solid reducing agent added is 10% of the mass of vanadium titanomagnetite, and the vanadium concentration in titanium slag is 1% of the vanadium concentration in molten iron. times. The vanadium slag obtained in the vanadium blowing step 4 is returned to the electric furnace melting step 3 again. In the cooling and crushing step 5, the average particle size of the vanadium-containing titanium slag after crushing is 0.1 μm. In the granulation and screening step 6, activated carbon with an average particle size of 0.1 μm is used as...

Embodiment 3

[0058] This embodiment adopts the method for comprehensive utilization of vanadium-titanium magnetite vanadium-titanium resources described in Example 1. In the fluidized bed pre-reduction process 2, the operating temperature is 960 ° C, the reducing gas is methane reformed gas, and the metallization rate 60%. The solid reducing agent in the electric furnace melting process 3 is petroleum coke, the operating temperature is 1800° C., the amount of solid reducing agent added is 40% of the mass of vanadium titanomagnetite, and the vanadium concentration in titanium slag is 5% of the vanadium concentration in molten iron. times. The vanadium slag obtained in the vanadium blowing step 4 is returned to the electric furnace melting step 3 again. In the cooling and crushing step 5, the crushed vanadium-containing titanium slag has an average particle size of 50 μm. In the granulation and screening step 6, coal powder with an average particle size of 50 μm is used as the carbon powde...

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Abstract

The invention belongs to the field of chemical engineering and metallurgy, and particularly discloses a method for comprehensively utilizing vanadium and titanium resources of vanadium titano-magnetite. Vanadium slag obtained in the vanadium blowing procedure is returned to the electric furnace melting separation procedure, vanadium is opened from titanium slag, the vanadium extraction path is changed, vanadium-titanium co-extraction is achieved, and the vanadium extraction tailing treatment problem is thoroughly solved. The crushing particle size of the vanadium-containing titanium slag is controlled, fine-particle carbon powder and a binder are added for granulation, ore / carbon contact is enhanced, catalytic chlorination is coupled, and therefore the chlorination reaction temperature is reduced, and the utilization problem of high-calcium magnesium and titanium resources is solved. A vanadium-iron alloy is directly smelted by adding a reducing agent and steel scraps into titanium tetrachloride vanadium removing dry slag, and therefore preparation of a vanadium pentoxide intermediate product is omitted, the process is greatly shortened, and the production cost is reduced. The method can realize comprehensive utilization of the vanadium and titanium resources in the vanadium titano-magnetite to respectively obtain titanium tetrachloride and ferrovanadium alloy products, and has the advantages of being high in resource utilization rate, capable of achieving energy conservation and consumption reduction, friendly to environment, high in product added value and the like.

Description

technical field [0001] The invention belongs to the fields of chemical industry and metallurgy, and particularly relates to a method for comprehensive utilization of vanadium-titanium magnetite, vanadium-titanium resources. Background technique [0002] my country is a country rich in vanadium and titanium resources, and the reserves of vanadium and titanium mines account for more than 35% of the world's total. Vanadium-titanium magnetite is its main form. Vanadium-titanium magnetite is an important strategic vanadium-titanium resource in my country. [0003] At present, my country's vanadium-titanium magnetite mainly adopts the blast furnace smelting process. The vanadium-titanium magnetite is mixed with ordinary iron ore and sent to the blast furnace for smelting to obtain vanadium-containing molten iron and titanium-containing blast furnace slag, and the vanadium-containing molten iron is blown to obtain vanadium slag and semi-steel. Vanadium slag undergoes sodiumizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B34/12C21B13/12
CPCC22B34/22C22B34/1222C21B13/12C21B13/006Y02P10/20Y02P10/143
Inventor 朱庆山杨海涛范川林李洪钟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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