Method for producing artificial rutile from titanium-containing blast furnace slags

Abstract

The invention provides a method for producing artificial rutile by taking the titanium-containing blast furnace slags as the raw material. The method has the advantages of short reaction time, high titanium recovery, low production cost, big treatment capacity and high product additional value and is environment-friendly. The method comprises the following steps: burdening: adding smelted or condensed titanium-containing blast furnace slags, a titanium-containing material, silica ores and an additive into a smelting furnace; smelting: smelting by the smelting furnace to keep the mixture underthe fusing state; oxidation: spraying and blowing an oxidizing gas into slags in the smelting furnace, or pouring the slags into a heat insulation slag tank or a heat insulation pit, spraying and blowing an oxidizing gas into slags in the heat insulation slag tank or the heat insulation pit to convert the titanium-containing substances in the slags into the rutile phase; cooling: keeping the temperature for the oxidized slags in the heat insulation slag tank or the heat insulation pit, and controlling the cooling rate to cool the slags to room temperature to cause the rutile phase to grow; and separation: and finally, breaking and levigating the oxidation modification condensed slags to separate the rutile phase to obtain the artificial rutile with high TiO2 grade.

Description

technical field [0001] The invention relates to the technical field of utilization of metallurgical resources, in particular to a method for producing artificial rutile with titanium-containing blast furnace slag. Background technique [0002] my country is rich in vanadium-titanium magnetite, one of the polymetallic symbiotic ores, which contains 12-45wt% iron, TiO 2 3-15wt%. During the high-temperature smelting process of vanadium-titanium magnetite, slag-iron separation is realized, but most of the titanium-containing oxides are stored in the slag phase in a very fine and dispersed state, becoming titanium-containing blast furnace slag. There are more than 3 million tons of titanium-containing blast furnace slag produced in my country every year, which contains TiO 2 More than 600,000 tons. However, the slag has not been effectively utilized for a long time. At present, more than 50 million tons have been piled up. It not only causes waste of resources, but also poll...

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Problems solved by technology

This method has the following disadvantages: the grade of perovskite concentrate is low, and the content of TiO2 is only 35-40wt%TiO2; the added value of the product is low, and the perovskite concentrate It is only suitable as the raw material of sulfuric acid titanium dioxide. During the production process of sulfuric acid titanium dioxide, the environmental pollution is serious; the recovery rate of TiO2 is low, and the recovery rate of TiO2 in the whole process is only 40% to 50%, resulting in waste of titanium resources; the temperature in the production process is difficult to control, which affects the coarsening and growth of perovskite, and further affects the beneficiation index of perovskite; the market capacity is small, due to the grade of perovskite concentrate Low, not suitable as a raw material for chloride titanium dioxide, therefore, the market capacity is small; the scope of use of titanium-containing blast furnace slag is small, and the content of titanium oxides ranges from 15 to 25%;

[0020] Reductive nitriding or selective precipitation technology is feasible, but there are high processing costs, low product added value, low titanium recovery rate, complex process flow, and product market Disadvantages such as small capacity;

[0021]In general, the existing treatment methods are still limited to the laboratory research and development stage, and the treatment methods have the following disadvantages: acid hydrolysis and leaching at high temperature, high labor intensity, and environmental pollution; Large equipment investment, complex operation, low added value of products; long process flow, unsatisfactory effect; low titanium recovery rate, small processing capacity, not enough to process more than 10 million tons of titanium-containing blast furnace slag per year

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