阅读说明：本技术 高炉渣氯化提钒的方法 (Method for extracting vanadium from blast furnace slag by chlorination ) 是由 王建鑫 李良 李亮 苏公昌 于 2019-10-30 设计创作，主要内容包括：本发明属于化工、冶金技术领域,具体涉及高炉渣直接进行氯化制取三氯氧钒的方法。本发明所要解决的技术问题是提供高炉渣氯化提钒的方法,包括以下步骤：将高炉渣、碳质还原剂和金属钛粉混合、预热,然后通入氯气进行反应,得到含三氯氧钒的混合产物。本发明方法能够很好地回收高炉渣中的钒。(The invention belongs to the technical field of chemical engineering and metallurgy, and particularly relates to a method for preparing vanadium oxychloride by directly chlorinating blast furnace slag. The invention aims to solve the technical problem of providing a method for extracting vanadium from blast furnace slag by chlorination, which comprises the following steps: mixing and preheating blast furnace slag, a carbonaceous reducing agent and metal titanium powder, and then introducing chlorine gas for reaction to obtain a mixed product containing vanadium oxytrichloride. The method can well recover the vanadium in the blast furnace slag.)

1. The method for extracting vanadium from blast furnace slag by chlorination is characterized by comprising the following steps: the method comprises the following steps: mixing and preheating blast furnace slag, a carbonaceous reducing agent and metal titanium powder, and then introducing chlorine gas for reaction to obtain a mixed product containing vanadium oxytrichloride.

2. The method for extracting vanadium from blast furnace slag through chlorination according to claim 1, characterized by comprising the following steps: the carbonaceous reducing agent is at least one of petroleum coke or carbon powder; further, the carbonaceous reducing agent is petroleum coke.

3. The method for extracting vanadium from blast furnace slag through chlorination according to claim 1 or 2, characterized by comprising the following steps: the granularity of the blast furnace slag is 100-500 meshes.

4. The method for extracting vanadium from blast furnace slag through chlorination according to any one of claims 1 to 3, characterized by comprising the following steps: the particle size of the carbonaceous reducing agent is 80-160 meshes.

5. The method for extracting vanadium from blast furnace slag through chlorination according to any one of claims 1 to 4, characterized by comprising the following steps: the granularity of the metal titanium powder is 60-120 meshes.

6. The method for extracting vanadium from blast furnace slag through chlorination according to any one of claims 1 to 5, characterized by comprising the following steps: the weight ratio of the blast furnace slag to the carbonaceous reducing agent is 100: 0.5-5.

7. The method for extracting vanadium from blast furnace slag through chlorination according to any one of claims 1 to 6, characterized by comprising the following steps: the weight ratio of the blast furnace slag to the metal titanium is 100: 3-8.

8. The method for extracting vanadium from blast furnace slag through chlorination according to any one of claims 1 to 7, characterized by comprising the following steps: preheating to 300-700 ℃; further, preheating to 310-650 ℃.

Technical Field

The invention belongs to the technical field of chemical engineering and metallurgy, and particularly relates to a method for preparing vanadium oxychloride by directly chlorinating blast furnace slag at a low temperature.

Background

The vanadium titano-magnetite in Panxi area has abundant reserves, and the vanadium resource accounts for about 60 percent of the reserves in China. At the present stage, the industrial development and utilization of vanadium titano-magnetite are realized by adopting a blast furnace-converter flow, but vanadium resources accounting for about 20% of the total resource amount enter blast furnace slag. How to realize the comprehensive utilization of vanadium resources in the high-titanium blast furnace slag is a difficult problem to be solved urgently in the current steel industry.

In the prior art, CN201710030787.X discloses a method for preparing high-purity vanadium pentoxide by using vanadium-containing materials, which comprises the steps of roasting the vanadium-containing materials to obtain a roasted product with the vanadium pentoxide content of less than 49 wt%, and reacting at 150-200 ℃ under the inert atmosphere condition to obtain vanadium oxychloride. The patent realizes the low-temperature chlorination vanadium extraction of the vanadium-containing material, but the vanadium-containing material needs to be roasted and then reacted under the protection of inert gas, so that the energy consumption is high and the process flow is long.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for extracting vanadium from blast furnace slag through chlorination. The method comprises the following steps: mixing and preheating blast furnace slag, a carbonaceous reducing agent and metal titanium powder, and then introducing chlorine gas for reaction to obtain a mixed product containing vanadium oxytrichloride.

Specifically, in the method for extracting vanadium from blast furnace slag by chlorination, the blast furnace slag is blast furnace slag generated by an iron-making blast furnace.

Specifically, in the method for extracting vanadium from blast furnace slag through chlorination, the carbonaceous reducing agent is at least one of petroleum coke or carbon powder.

Further, in the method for extracting vanadium from blast furnace slag through chlorination, the carbonaceous reducing agent is petroleum coke.

Specifically, in the method for extracting vanadium from blast furnace slag through chlorination, the granularity of the blast furnace slag is 100-500 meshes.

Specifically, in the method for extracting vanadium from blast furnace slag through chlorination, the particle size of the carbonaceous reducing agent is 80-160 meshes.

Specifically, in the method for extracting vanadium from blast furnace slag through chlorination, the granularity of the metal titanium powder is 60-120 meshes.

Specifically, in the method for extracting vanadium from blast furnace slag through chlorination, the weight ratio of the blast furnace slag to the carbonaceous reducing agent is 100: 0.5-5.

Specifically, in the method for extracting vanadium from blast furnace slag through chlorination, the weight ratio of the blast furnace slag to the metal titanium powder is 100: 3-8.

Specifically, in the method for extracting vanadium from blast furnace slag through chlorination, the preheating is carried out to 300-700 ℃.

Further, in the method for extracting vanadium from blast furnace slag through chlorination, the preheating is carried out to 310-650 ℃.

The method is specially researched for extracting vanadium from blast furnace slag, the blast furnace slag is directly chloridized at low temperature to prepare vanadium oxychloride, the effective recycling of V in the secondary resource blast furnace slag is realized, the recycling is realized by using a direct chloridizing mode, the metallic titanium powder is added into the reaction material, the reaction of the metallic titanium powder releases heat, the self-heating in the reaction process is realized, the external heating is not needed, the process flow is short, the recovery rate of the vanadium reaches more than 50%, and the recovery rate is high.

Detailed Description

The method for extracting vanadium from blast furnace slag through chlorination comprises the following steps: mixing 100 parts of blast furnace slag with the granularity of 100-500 meshes, 0.5-5 parts of carbonaceous reducing agent with the granularity of 80-160 meshes and 3-8 parts of metal titanium powder with the granularity of 60-120 meshes by mass to form a mixture; then, adding the mixture into a chlorination furnace to finish feeding operation; after feeding is finished, preheating a solid mixture consisting of blast furnace slag, a carbonaceous reducing agent and metal titanium powder, and heating the mixture to 300-700 ℃; and after preheating is finished, introducing chlorine into the chlorination furnace to enable the chlorine and the preheated mixture to perform chlorination reaction, wherein no additional heating is needed, and the chlorination reaction temperature can be maintained at 300-700 ℃ by the heat released in the metal titanium powder reaction, so that the mixed gas containing the vanadium oxychloride is obtained.

In the method, the preheating is used for heating and drying the materials; during chlorination reaction, vanadium in the blast furnace slag is chlorinated into vanadium oxychloride, titanium is chlorinated into titanium tetrachloride, and finally the obtained mixed gas which is actually the gases of the vanadium oxychloride, the titanium tetrachloride and the like is collected and then can be separated by a conventional method, for example, the mixed gas is condensed and then separated by different boiling points, or the mixed gas is condensed and then separated by an aluminum powder vanadium removal method. In the reaction process, the metal titanium powder reacts to release heat without external additional heating.