Method for extracting titanium from vanadium-titanium magnetite

Abstract

The invention discloses a method for extracting titanium from vanadium-titanium magnetite. The method comprises the following steps: adding sodium or potassium salt additive in the reduction smelting of an iron ore concentrate electric stove to obtain liquid iron and titanium-containing slag, wherein vanadium and iron are reduced to enter liquid iron, under a smelting high temperature condition, silicon and aluminum impurities form sodium aluminosilicate capable of being dissolved in dilute acid with the sodium or potassium salt additive, and enabling the sodium aluminosilicate and titanium and aluminum magnesium impurities to remain in the titanium-containing slag; purifying the titanium-containing slag by virtue of a wet-method metallurgical impurity removal method, to acquire a titanium slag product with TiO2 content more than 75 percent. For the application problem of titanium in the iron ore concentrate, the slag modification additive is added in the reduction smelting process, so that not only is the mobility of the slag improved, but also a condition is created for removing the later silicon-aluminum impurities of the slag, the high-efficiency separation and extraction problem of the titanium in the iron ore concentrate can be well solved, the resource utilization rate of the iron, titanium and vanadium is greatly increased, and the utilization rate of the titanium is increased about 3 times compared with the flow of a blast furnace.

Description

technical field [0001] The invention relates to the technical field of mineral processing and utilization, in particular to a process for extracting titanium from vanadium-titanium magnetite. Background technique [0002] The vanadium-titanium magnetite resource in the Panzhihua-Xichang area of ​​Sichuan Province in my country is one of the three famous symbiotic ore resources in China. The reserves of vanadium-titanium magnetite resources reach 10 billion tons, accounting for a quarter of the world's reserves of similar resources. The national reserves 90% of the total, and the distribution of vanadium-titanium magnetite resources is concentrated, most of which are distributed in the four major mining areas of Panzhihua, Baima, Hongge, and Taihe. Among them, the resource reserves of the Hongge mining area are 3.57 billion tons, and the Baima mining area is 1.742 billion tons. The mining area is 1.718 billion tons, and the Panzhihua mining area is 1.586 billion tons. [0003]...

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Problems solved by technology

[0007] 3. Titanium magnetite contains 4-7% magnesium aluminum spinel into the iron concentrate, so that the iron concentrate contains higher MgO and Al 2 o 3 ; Ilmenite also contains magnesium-aluminum spinel, which makes the MgO content in titanium concentrate higher, which is not conducive to the production of high-grade titanium-rich materials

[0021] 1. The timing of adding sodium salt is to add sodium salt to the slag after iron reduction, and the roasting temperature is 800-900 degrees Celsius. The purpose is to extract vanadium pentoxide in titanium-containing slag, and the slag after vanadium extraction has more impurities. The grade of titanium is low, and it is difficult and costly to extract titanium by conventional methods

[0022] 2. The amount of sodium salt added to slag roasting is large (slag: sodium salt = 1-2:1). According to the existing vanadium titanomagnetite iron concentrate, the content of vanadium pentoxide is 0.6%. The content of vanadium oxide accounts for up to 2.4%, that is to say, the addition of sodium salt reagent is too large to be practically used at all.

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