Method for preparing low-silicon-titanium-type vanadium slag from vanadium-containing molten iron

Abstract

The invention relates to a method for preparing low-silicon-titanium-type vanadium slag from vanadium-containing molten iron. The method solves the problem that the vanadium slag which is melted by blowing from the vanadium-containing molten iron in an existing technology is high in silicon content and low in vanadium content. According to the method, a weak oxidizing gas is blown to the high-silicon low-vanadium molten iron as a weak oxidizing agent for removing the silicon, the silicon in the vanadium-containing molten iron is slightly oxidized into a silicon oxide gas to be removed, the vanadium in optimized molten iron is hardly oxidized, and the obtained optimized molten iron is high in vanadium content and low in silicon content; and then oxygen is used as a strong oxidizing agent to deeply oxidize the high-vanadium low-silicon purified molten iron, and the high-quality high-vanadium low-silicon vanadium slag is obtained. The method has the advantages of being reasonable in technological process design, simple, convenient, safe and stable in operation and free of environmental pollution and waste discharge. The vanadium slag prepared by the method is excellent in quality, low in silicon impurity content and titanium impurity content, and high in vanadium content. When the high-quality vanadium slag is used, the quality of vanadium pentoxide in the subsequent preparation and the quality of metal vanadium and vanadium series alloys prepared by the vanadium pentoxide can be remarkably improved, the technical process of subsequent preparation is simplified, and the economic and social benefits are improved.

Description

technical field [0001] The invention relates to a new process for preparing vanadium slag from vanadium-containing molten iron, in particular a method of "shallowly oxidizing" high-silicon and low-vanadium molten iron by using a weak oxidant to obtain "de-siliconized and vanadium-containing" vanadium-containing molten iron to prepare low-silicon-titanium type The method of vanadium slag. The high-vanadium, low-silicon and titanium-type vanadium slag finally obtained by the method is used as a raw material for extracting vanadium, and the obtained low-vanadium and low-silicon-titanium molten iron is transported to a steelmaking plant for use as molten iron for oxygen steelmaking. Background technique [0002] Vanadium-titanium magnetite is a compound ore in which iron, vanadium, titanium and other valuable elements coexist. my country has abundant reserves of vanadium-titanium magnetite, which are mainly distributed in Panxi, Chengde and Ma'anshan. Extracting vanadium from v...

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Problems solved by technology

[0014] The purpose of the present invention is to provide a method for preparing low-silicon-titanium vanadium slag from vanadium-containing molten iron, which solves the problem of high silicon content and low vanadium in the slag existing in the existing vanadium-containing molten iron blowing vanadium slag technology, and its process flow design is reasonable. Simple operation, safe and stable operation, no environmental pollution, no waste discharge, the output of vanadium slag is of high quality, low in silicon and titanium impurities, and high in vanadium content, which can significantly improve the subsequent preparation of V 2 o 5 and use V 2 o 5 Prepare the quality of metal vanadium and vanadium series alloys and reduce manufacturing costs

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