Method for recovering iron, vanadium and titanium from schreyerite through shaft furnace reduction and electric furnace smelting and separating deep reduction

Abstract

The invention discloses a method for recovering iron, vanadium and titanium from schreyerite through shaft furnace reduction and electric furnace smelting and separating deep reduction. The method comprises the following steps of: producing a vanadium-titanium oxidized pellet; directly reducing the vanadium-titanium oxidized pellet; smelting and separating a metalized pellet through an electric furnace; extracting vanadium from molten vanadium-containing iron; smelting and separating titanium slag to manufacture titanium dioxide; smelting and separating vanadium slag to manufacture V2O5. According to the method, coal gas, converted coke oven gas or natural gas is used as a reducing agent to reduce original vanadium titanium magnetite, so that the dependency of the traditional blast furnace process to coking coal can be greatly reduced, and diversification of metallurgical energy is realized; by adopting the process, the vanadium titanium magnetite can be smelted completely; mixed smelting of common iron ore and vanadium titanium magnetite is not needed, so that the smelting efficiency is higher; titanium dioxide in the smelted and separated titanium slag produced in smelting accounts for more than 50%, therefore, the slag can be directly used as the raw material for preparing titanium dioxide, and as a result, the recovery rate of vanadium, titanium and iron can be raised; simultaneously, the smelted and separated titanium slag and vanadium slag can be directly utilized, thus the environmental pollution and land resource occupation caused by piling and storing the slag can be avoided.

Description

technical field [0001] The invention relates to a smelting process, in particular to a smelting process for vanadium-titanium ore. Background technique [0002] The reserves of vanadium-titanium magnetite in Panxi area are more than 10 billion tons, and it is rich in various useful elements such as iron, vanadium and titanium, and has extremely high comprehensive utilization value. After more than 40 years of development, the region has formed a production capacity of more than 10 million tons of vanadium-titanium magnetite concentrate, but the utilization of vanadium-titanium magnetite is still the traditional "blast furnace-converter" process. and huge production capacity, etc., but there are still inherent deficiencies. First, because of its strong dependence on metallurgical coke, although more than 6 billion tons of coal resources have been proven in the Panxi area, only 1 billion tons of coking coal can be used for metallurgical production, and 5 billion tons of non-c...

AI Technical Summary

Problems solved by technology

First, because of its strong dependence on metallurgical coke, although more than 6 billion tons of coal resources have been proven in the Panxi region, only 1 billion tons of coking coal can be used for metallurgical production, and 5 billion tons of non-coking coal cannot be used nearby

As a result, on the one hand, a large amount of metallurgical coal had to be purchased from other places, and on the other hand, Panxi African coking coal had to be shipped to various places, which not only caused a lot of economic waste, but also caused great pressure on road transportation

The second is that the process has a low comprehensive recycling capacity when dealing with polymetallic symbiotic ores

Due to the characteristics of vanadium and titanium resources and the resulting technical obstacles, this process can only recover iron and vanadium in vanadium-titanium magnetite, but titanium enters the blast furnace slag in the form of titanium dioxide, which is not recycled.

The third is that it is impossible to smelt all vanadium and titanium into the furnace. Because the high titanium slag is too sticky, it is easy to block the blast furnace. Therefore, although the blast furnace technology is becoming more and more mature, the content of titanium dioxide in the blast furnace slag is still required to be below 22%. Furnace proportion must be less than 60%

The disadvantages of this technology are: the reduction time in the shaft furnace is too long, and the industrial implementation is difficult; after melting, the vanadium enters the slag, and the amount of subsequent vanadium extraction slag is large and it is difficult to achieve economic recovery.

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