阅读说明：本技术 高炉渣低温氯化制备三氯氧钒的方法 (Method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination ) 是由 王建鑫 李良 周丽 凌鹏 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,具体涉及高炉渣低温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低温氯化制备三氯氧钒的方法,包括以下步骤：将高炉渣和碳质还原剂混合、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 from blast furnace slag through low-temperature chlorination. The invention aims to solve the technical problem of providing a method for preparing vanadium oxychloride from blast furnace slag by low-temperature chlorination, which comprises the following steps: mixing and preheating blast furnace slag and a carbonaceous reducing agent, 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 preparing vanadium oxychloride from blast furnace slag by low-temperature chlorination is characterized by comprising the following steps: the method comprises the following steps: mixing and preheating blast furnace slag and a carbonaceous reducing agent, and then introducing chlorine gas for reaction to obtain a mixed product containing vanadium oxytrichloride.

2. The method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination according to claim 1, wherein the method comprises 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 preparing vanadium oxytrichloride from blast furnace slag through low-temperature chlorination according to claim 1 or 2, characterized by comprising the following steps: the granularity of the blast furnace slag is 100-600 meshes.

4. The method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination according to any one of claims 1 to 3, wherein the method comprises the following steps: the particle size of the carbonaceous reducing agent is 80-200 meshes.

5. The method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination according to any one of claims 1 to 4, wherein the method comprises the following steps: the weight ratio of the blast furnace slag to the carbonaceous reducing agent is 100: 5-10; furthermore, the weight ratio of the blast furnace slag to the carbonaceous reducing agent is 100: 6-8.

6. The method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination according to any one of claims 1 to 5, wherein the method comprises the following steps: preheating to 300-400 ℃; further, preheating to 310-390 ℃.

7. The method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination according to any one of claims 1 to 6, wherein the method comprises the following steps: the reaction temperature is 300-400 ℃.

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 preparing vanadium oxytrichloride by low-temperature chlorination of blast furnace slag. The method comprises the following steps: mixing and preheating blast furnace slag and a carbonaceous reducing agent, and then introducing chlorine gas for reaction to obtain a mixed product containing vanadium oxytrichloride.

Specifically, in the method for preparing vanadium oxychloride by low-temperature chlorination of blast furnace slag, the blast furnace slag is blast furnace slag generated by an iron-making blast furnace.

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

Further, in the method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination, the carbonaceous reducing agent is petroleum coke.

Specifically, in the method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination, the granularity of the blast furnace slag is 100-600 meshes.

Specifically, in the method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination, the particle size of the carbonaceous reducing agent is 80-200 meshes.

Specifically, in the method for preparing vanadium oxytrichloride from blast furnace slag through low-temperature chlorination, the weight ratio of the blast furnace slag to the carbonaceous reducing agent is 100: 5-10.

Further, in the method for preparing vanadium oxytrichloride from blast furnace slag through low-temperature chlorination, the weight ratio of the blast furnace slag to the carbonaceous reducing agent is 100: 6-8.

Specifically, in the method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination, the temperature is preheated to 300-400 ℃.

Further, in the method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination, the preheating is carried out to 310-390 ℃.

Specifically, in the method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination, the reaction temperature is 300-400 ℃.

The method of the invention is specially researched for extracting vanadium in 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, and the process flow is short.

Detailed Description

The method for preparing vanadium oxychloride from blast furnace slag through low-temperature chlorination comprises the following steps: mixing 100 parts by weight of blast furnace slag and 5-10 parts by weight of carbonaceous reducing agent, adding the mixture into a chlorination furnace, and preheating the mixture of the blast furnace slag and the carbonaceous reducing agent to 300-400 ℃; and after preheating is finished, introducing chlorine into the chlorination furnace to enable the chlorine and the preheated mixture to perform chlorination reaction, wherein in the reaction process, external heating is needed to maintain the reaction temperature to be stable at 300-400 ℃, and an electric heating mode is generally adopted for the external heating to obtain the mixed gas containing the vanadium oxytrichloride.

Further, the preheating step is used for preheating the mixture to 310-390 ℃.

Further, the mixture is formed by mixing 100 parts by weight of blast furnace slag and 6-8 parts by weight of carbonaceous reducing agent.

Furthermore, the granularity of the blast furnace slag is 100-600 meshes, and the granularity of the carbonaceous reducing agent is 80-200 meshes.

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.