Method for producing titanium dioxide through low-temperature chlorination of titanium-rich material

A technology of titanium dioxide and titanium-rich materials, applied in the fields of metallurgy and chemical industry, can solve problems such as difficult to effectively control furnace temperature, increase production costs, and increase heat release, so as to avoid loss of flow, improve utilization efficiency, and reduce chlorination reaction temperature Effect

Active Publication Date: 2021-04-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reasons are as follows: (1) In order to ensure the strength of the pre-condensed body, it is generally necessary to add a binder and undergo thermal curing, which consumes a lot of energy and increases the production cost
(2) Chlorination reaction of titanium-rich materials at low temperature, the product of carbonaceous reducing agent is mainly CO 2 , the heat release increases significantly, making it difficult to effectively control the furnace temperature
[0006] To sum up, the utilization of existing high-calcium-magnesium-rich titanium materials has the problems of long process, high energy consumption and low added value.

Method used

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  • Method for producing titanium dioxide through low-temperature chlorination of titanium-rich material

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Experimental program
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Embodiment 1

[0043] combine figure 1 A method for producing titanium dioxide by low-temperature chlorination of titanium-rich materials used in this embodiment includes crushing and grinding process 1, mixing and briquetting process 2, thermal curing process 3, crushing and screening process 4, low-temperature chlorination process 5, Cooling and heat exchange process 6, refining process 7, high temperature oxidation process 8 and deoxidation cooling process 9, the method is carried out according to the following steps:

[0044] 1) In the crushing and grinding process 1, the titanium-rich material is mixed with carbon powder and a binder to be crushed and ground to obtain fine ore powder;

[0045] 2) In the mixing and briquetting process 2, the fine ore powder is uniformly mixed with the fine powder from the crushing and screening process 4, and then pressed into a pressed block;

[0046] 3) In the thermal curing process 3, the pressed block material is exchanged with the hot nitrogen gas ...

Embodiment 2

[0054] This embodiment adopts a method for producing titanium dioxide by low-temperature chlorination of a titanium-rich material described in Example 1. The titanium-rich material is direct reduction of vanadium-titanium magnetite concentrate and melted titanium slag, containing 40% TiO 2 , 5% CaO, 13% MgO. In the crushing and grinding step 1, carbon powder refers to activated carbon, and the binder refers to phenolic resin. In the crushing and grinding step 1, the added mass of carbon powder is 10% of the mass of titanium-rich material, and the added mass of binder is 1% of the mass of titanium-rich material. In the crushing and grinding step 1, the average particle size of the ground mixed fine mineral powder is controlled to be 0.1 μm. In the mixed briquetting process 2, the fine mineral powder is formed by pressing, wherein the pressure is 0.3 MPa. In the thermal curing step 3, the temperature of the hot nitrogen gas is 400°C, and the curing temperature is 100°C. In th...

Embodiment 3

[0056] This embodiment adopts the method for producing titanium dioxide by low-temperature chlorination of a titanium-rich material described in Example 1. The titanium-rich material is artificial rutile containing 98% TiO 2. In the crushing and grinding step 1, carbon powder refers to metallurgical coke, and the binder refers to sucrose. In the crushing and grinding process 1, the mass of carbon powder added is 50% of the mass of titanium-rich material, and the mass of binder added is 10% of the mass of titanium-rich material. In the crushing and grinding step 1, the average particle size of the ground mixed fine mineral powder is controlled to be 50 μm. In the mixed briquetting process 2, the fine mineral powder is formed by pressing, wherein the pressure is 20 MPa. In the thermal curing step 3, the temperature of the hot nitrogen gas is 680°C, and the curing temperature is 650°C. In the crushing and screening step 4, the average sieving particle size of the chlorinated r...

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Abstract

The invention belongs to the field of chemical engineering and metallurgy. Specifically, the invention discloses a method for producing titanium dioxide through low-temperature chlorination of a titanium-rich material. The method comprises the following steps: carbon powder and a binder are added into a titanium-rich material, and steps of crushing, grinding, mixing, briquetting, enhancing the ore/carbon contact effect are carried out, and the chlorination reaction temperature is lowered; high-temperature materials in the chlorination reactor are circularly discharged, cooled through nitrogen and then returned to the chlorination furnace, and efficient removal of heat of the chlorination reactor is achieved. Hot nitrogen obtained through heat exchange is used for providing heat for the thermocuring process, the energy utilization efficiency is improved, and energy consumption is reduced. The oxygen-containing chlorine generated by titanium tetrachloride oxidation is deoxidized and cooled, so that the oxygen introduction amount of the chlorination reactor is reduced, and the problem of temperature fluctuation of the low-temperature chlorination reactor is solved; and therefore, the problem of short-process efficient utilization of the titanium-rich material is solved. The method has the advantages of wide raw material adaptability, high resource utilization rate, energy conservation, consumption reduction, environmental friendliness 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 producing titanium dioxide by low-temperature chlorination of titanium-rich materials. Background technique [0002] At present, there are mainly two ways to utilize titanium resources, the chlorination process and the sulfuric acid process, and the chlorination process includes fluidized chlorination and molten salt chlorination. Fluidized chlorination refers to the carbon chlorination of titanium-containing materials in a fluidized bed to obtain titanium tetrachloride intermediates. Titanium tetrachloride can be oxidized to produce titanium dioxide, and magnesium can also be reduced to produce sponge titanium. Fluidized chlorination process is short, low cost, less pollution, and large production capacity is a mainstream advanced titanium resource utilization technology. However, the fluidized chlorination process has very high requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/07
CPCC01G23/07Y02P20/10
Inventor 范川林朱庆山杨海涛马素刚李洪钟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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