Method for separating titanium, iron, vanadium and calcium from mixed titaniferous slag

Abstract

The invention belongs to the field of metallurgy, and in particular relates to a method for separating titanium, iron, vanadium and calcium from mixed titaniferous slag. The method comprises the following steps of: sufficiently mixing blast furnace liquid molten titaniferous blast furnace slag and converter vanadium-containing steel slag flowing out from slag discharge holes, so as to form mixed molten slag, blowing an oxidization gas into a mixed molten body, after the gas blowing is accomplished, naturally cooling down the molten slag, manually taking out the vanadium-containing metal iron which is settled to the bottom of the molten slag, further separating the rest vanadium-containing metal iron in a magnetic separation mode, and finally separating titaniferous ingredients in the molten slag from gangue phase by using a gravity separation method so as to obtain titanium concentrate and tailings the main phases which are perovskite phases, wherein the mass percentage of TiO2 in the titanium concentrate is 35-50%. According to the method, the physical thermal resource of the molten slag is sufficiently utilized, the efficiency is high, the energy is saved, and meanwhile the titanium ingredient, the iron ingredient, the vanadium ingredient and the free calcium oxide ingredient in the mixed molten slag are recycled, so that the purpose of comprehensive high-efficiency recycling on secondary resource is achieved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for separating titanium-iron-vanadium-calcium from titanium-containing mixed slag. Background technique [0002] As we all know, my country is a country rich in titanium resources, which contains abundant resources of vanadium-titanium magnetite. Vanadium-titanium magnetite is a multi-element paragenetic iron ore mainly composed of iron, vanadium and titanium, accompanied by various valuable elements. After the vanadium-titanium magnetite is separated through the traditional metallurgical process "blast furnace ironmaking-converter steelmaking", titanium-containing blast furnace slag and vanadium-titanium steel slag are produced. [0003] Titanium-containing blast furnace slag is produced in the blast furnace ironmaking process of vanadium-titanium magnetite. Its TiO 2 The content is 6%~30%, the content of vanadium-containing pig iron is 4%~8%, and the content of ...

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Problems solved by technology

[0029] (1) The methods in the above two patents can only realize the effective utilization of one type of slag, that is, titanium-containing blast furnace slag, with low chemical activity, low temperature, high processing cost, and the effect of migration, enrichment and growth of iron and titanium components Poor, low recovery rate, can only realize the recycling of iron and titanium groups, and does not realize the effective enrichment of valuable elements;

[0030] (2) The methods in the above two patents can only use one type of slag, that is, titanium-containing blast furnace slag. The temperature of single slag-titanium-containing blast furnace slag is low, and a large amount of heat needs to be compensated, which is costly and complicated to operate;

[0031] (3) SiO needs to be added to the above two patents 2 , CaO, CaF 2 Additives such as additives will cause the temperature of the slag to drop rapidly during the process of adding the additive, wasting a part of the heat in the slag, therefore, it is necessary to compensate for the heat, waste energy, increase costs, and increase the complexity of the processing process;

[0032] (4) The separation methods used in the above two inventions are all methods of combining gravity separation with flotation and hydrometallurgy. The flotation separation and hydrometallurgy separation processes are likely to cause environmental pollution

At present, there is no foreign research on comprehensive recycling of titanium-containing slag (titanium-containing blast furnace slag and titanium-containing steel slag)

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