阅读说明：本技术 利用精制尾渣制备钒钛合金的方法 (Method for preparing vanadium-titanium alloy by using refined tailings ) 是由 周丽 张溅波 李良 王建鑫 于 2019-10-12 设计创作，主要内容包括：本发明公开了一种利用精制尾渣制备钒钛合金的方法,属于冶金技术领域。本发明为同时回收利用四氯化钛精制中钒和钛,提供一种利用精制尾渣制备钒钛合金的方法,包括：先将精制尾渣进行通氧焙烧脱氯处理,得脱氯精制尾渣；以石墨电极作为加热电极,加入铝作为还原物料和脱氯精制尾渣进行电渣重熔,持续通电,待铝制自耗电极耗尽后,即得钒钛合金。本发明将精制尾渣中的钒元素回收利用的同时,还防止了宝贵资源钛元素的流失,且钒钛回收率高,所得钒钛合金应用领域广,保证了良好的附加产值收益。(The invention discloses a method for preparing a vanadium-titanium alloy by using refined tailings, belonging to the technical field of metallurgy. The invention provides a method for preparing vanadium-titanium alloy by using refined tailings for simultaneously recycling vanadium and titanium in titanium tetrachloride refining, which comprises the following steps: firstly, carrying out oxygen-introducing roasting dechlorination treatment on the refined tailings to obtain dechlorinated refined tailings; and (3) taking a graphite electrode as a heating electrode, adding aluminum as a reducing material and dechlorination refined tailings, carrying out electroslag remelting, continuously electrifying, and obtaining the vanadium-titanium alloy after the aluminum consumable electrode is exhausted. The method provided by the invention can be used for recycling the vanadium element in the refined tailings, preventing the loss of the titanium element which is a precious resource, and ensuring high vanadium-titanium recovery rate, and the obtained vanadium-titanium alloy has a wide application field and ensures good additional output value income.)

1. The method for preparing the vanadium-titanium alloy by using the refined tailings is characterized by comprising the following steps of: the method comprises the following steps: firstly, carrying out oxygen-introducing roasting dechlorination treatment on the refined tailings to obtain dechlorinated refined tailings; and (3) taking a graphite electrode as a heating electrode, adding aluminum as a reducing material and dechlorination refined tailings, carrying out electroslag remelting, continuously electrifying, and obtaining the vanadium-titanium alloy after the aluminum consumable electrode is exhausted.

2. The method for preparing the vanadium-titanium alloy by using the refined tailings as claimed in claim 1, wherein: the refined tailings comprise the following components in percentage by mass: 10-20% of TV, 12-25% of Ti, 3-15% of Cl, 3-12% of C, 0.6-2% of Si, 1-1.8% of Fe and 0.1-0.3% of Al.

3. The method for preparing the vanadium-titanium alloy from the refined tailings according to claim 1, wherein in the oxygen-introducing roasting dechlorination treatment, the oxygen flow rate is controlled to be 135-420 m ³/(h & t refined tailings), the roasting temperature is 450-600 ℃, and the roasting time is 30-90 min.

4. The method for preparing a vanadium-titanium alloy from the refined tailings according to any one of claims 1 to 3, wherein: the dechlorination refined tailings comprise the following components in percentage by mass: 15-25% of TV, 18-30% of Ti, less than 0.05% of Cl, less than 0.05% of C, 1.2-2% of Fe, 0.5-2% of Al and 1.5-3% of Si.

5. The method for preparing the vanadium-titanium alloy by using the refined tailings as claimed in claim 1, wherein: the adding amount of the aluminum reducing material is 1.0-1.3 times of the theoretical aluminum consumption.

6. The method for preparing a vanadium-titanium alloy from the refined tailings according to any one of claims 1 to 5, wherein: and when electroslag remelting is carried out, controlling the unit power consumption of reduction smelting to be 600-1300 kWh/ton.

Technical Field

The invention belongs to the technical field of metallurgy, and particularly relates to a method for preparing a vanadium-titanium alloy by using refined tailings.

Background

The method comprises the steps of separating VOCl ₂ or low-valent chlorides of vanadium and other solid impurities generated in a refining vanadium-removing process from residues, recovering titanium tetrachloride in the obtained residues in an evaporation concentration mode, and after titanium tetrachloride is recovered by evaporation, obtaining titanium tetrachloride refined tailings, wherein the titanium tetrachloride refined tailings are 400t per year by Panzhi group titanium industry companies, the titanium tetrachloride refined tailings are one of typical TiCl solid wastes in a production process of 4, and a large amount of hydrochloric acid is released in a stacking process of the titanium tetrachloride refined tailings to seriously pollute the environment, and the vanadium content (about 10-18 per thousand) and the titanium content (about 18-25%) in the residues are high, so that the waste of resources is caused.

At present, most of vanadium in the tailings is extracted to prepare common vanadium or high-purity vanadium aiming at the comprehensive utilization of the refined tailings of titanium tetrachloride, so that a large amount of titanium is wasted, and no report exists for simultaneously recycling vanadium and titanium resources in the refined tailings.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for simultaneously recycling vanadium and titanium in titanium tetrachloride refined tailings so as to realize the comprehensive utilization of vanadium and titanium in the refined tailings.

The technical scheme adopted by the invention for solving the technical problems is to provide a method for preparing vanadium-titanium alloy by using refined tailings, which comprises the following steps: firstly, carrying out oxygen-introducing roasting dechlorination treatment on the refined tailings to obtain dechlorinated refined tailings; and (3) taking a graphite electrode as a heating electrode, adding aluminum as a reducing material and dechlorination refined tailings, carrying out electroslag remelting, continuously electrifying, and obtaining the vanadium-titanium alloy after the aluminum consumable electrode is exhausted.

In the method for preparing the vanadium-titanium alloy by using the refined tailings, the refined tailings contain the following components in percentage by mass: 10-20% of TV, 12-25% of Ti, 3-15% of Cl, 3-12% of C, 0.6-2% of Si, 1-1.8% of Fe and 0.1-0.3% of Al.

in the method for preparing the vanadium-titanium alloy by using the refined tailings, the oxygen flow is controlled to be 135-420 m ³/(h refined tailings) in the oxygen-introducing roasting dechlorination treatment, the roasting temperature is 450-600 ℃, and the roasting time is 30-90 min.

In the method for preparing the vanadium-titanium alloy by using the refined tailings, the dechlorination refined tailings comprise the following components in percentage by mass: 15-25% of TV, 18-30% of Ti, less than 0.05% of Cl, less than 0.05% of C, 1.2-2% of Fe, 0.5-2% of Al and 1.5-3% of Si.

In the method for preparing the vanadium-titanium alloy by using the refined tailings, the addition amount of the aluminum reducing material is 1.0-1.3 times of the theoretical aluminum consumption amount.

In the method for preparing the vanadium-titanium alloy by using the refined tailings, the unit power consumption of reduction smelting is controlled to be 600-1300 kWh/ton when electroslag remelting is carried out.

The invention has the beneficial effects that:

The method provided by the invention can be used for recycling the vanadium element in the refined tailings, preventing the loss of the titanium element which is a precious resource, and ensuring high vanadium-titanium recovery rate, and the obtained vanadium-titanium alloy has a wide application field and ensures good additional output value income.

Detailed Description

Specifically, the method for preparing the vanadium-titanium alloy by using the refined tailings comprises the following steps: firstly, carrying out oxygen-introducing roasting dechlorination treatment on the refined tailings to obtain dechlorinated refined tailings; and (3) taking a graphite electrode as a heating electrode, adding aluminum as a reducing material and dechlorination refined tailings, carrying out electroslag remelting, continuously electrifying, and obtaining the vanadium-titanium alloy after the aluminum consumable electrode is exhausted.

The method is suitable for refining tailings in a titanium tetrachloride production process, the refining tailings do not exist in a simple substance form, exist in a chloride form partially, exist in an oxide form partially, and generally contain the following components in percentage by mass: 10-20% of TV, 12-25% of Ti, 3-15% of Cl, 3-12% of C, 0.6-2% of Si, 1-1.8% of Fe and 0.1-0.3% of Al.

In the method, refined tailings need to be subjected to oxygen-passing roasting dechlorination, the flow of oxygen is controlled to be 135-420 m ³/(h & t refined tailings) according to the components of the refined tailings, the roasting temperature is 450-600 ℃, the roasting time is 30-90 min, and the method can ensure that chlorine in the refined tailings is completely removed, metal elements in chlorides exist in the form of metal oxides, and the chlorine escapes in the form of chlorine gas.

VCl₃+O₂→V₂O₅+Cl₂

VOCl₂+O₂→V₂O₅+Cl₂

TiOCl₂+O₂→TiO₂+Cl₂

FeCl₃+O₂→Fe₂O₃+Cl₂

C+O₂＝CO₂。

Through the reaction, the dechlorination refined tailings contain the following components in percentage by mass: 15-25% of TV, 18-30% of Ti, less than 0.05% of Cl, less than 0.05% of C, 1.2-2% of Fe, 0.5-2% of Al and 1.5-3% of Si.

the adding amount of the aluminum reducing material is 1.0-1.3 times of the theoretical aluminum consumption amount of the reaction of Al, Ti and V, so that vanadium and titanium in the refined tailings can be reduced as completely as possible, and excessive aluminum reacts with other substances without residual simple substance aluminum.

In the invention, the unit power consumption of reduction smelting is controlled to be 600-1300 kWh/ton, an aluminum consumable electrode is melted under strong current, molten aluminum liquid contacts and reacts with high-temperature refined tailings, oxides such as TiO ₂, V ₂ O ₅ and the like in the refined tailings are reduced to form high-temperature molten vanadium-titanium alloy, and the remaining solid residue mainly comprises aluminum oxide, wherein the reduction reaction generated in the process mainly comprises the following steps:

TiO₂(s)+Al(l)→[Ti]+(Al₂O₃)

V₂O₅(s)+Al(l)→[V]+(Al₂O₃)

Fe₂O₃(s)+Al(l)→[Fe]+(Al₂O₃)

SiO₂(s)+Al(l)→[Si]+(Al₂O₃)。

The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.