A method for preparing metallic titanium using titanium oxide-containing slag

CN116536712BActive Publication Date: 2026-06-26KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Filing Date
2023-05-12
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies cannot effectively separate silicon and titanium in the silicon-titanium master alloy obtained by silicon reduction of titanium-containing blast furnace slag into metallic titanium and metallic silicon simultaneously, which limits the further development and industrial application of the silicon reduction method.

Method used

By combining silicon reduction and molten salt electrolysis, bulk Si-Ti master alloys were prepared by controlling the mass ratio of titanium oxide slag to low-purity silicon and adding slag-forming agents. Subsequently, the Si-Ti master alloys were separated into metallic titanium and metallic silicon powder by molten salt electrolysis. NaCl–KCl–NaF molten salt was used and the valence state of titanium was controlled to be +3 to achieve electrolytic separation.

Benefits of technology

It achieves the clean utilization of low-grade titanium oxide slag and crystalline silicon waste, with high economic benefits and no waste acid or waste gas generated in the process, making it environmentally friendly.

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Abstract

The present application relates to a kind of method for preparing metal titanium using titanium oxide containing slag, belong to resource clean utilization technical field.Titanium oxide containing slag, low-purity silicon and slagging agent are reduced smelting together, after slag-gold separation, obtain bulk Si-Ti intermediate alloy and residue;The obtained bulk Si-Ti intermediate alloy is crushed into Si-Ti intermediate alloy particles with particle size less than 4mm;With the obtained Si-Ti intermediate alloy particles as anode, with metal molybdenum or metal nickel as cathode, with metal titanium as reference electrode, with NaCl-KCl-NaF as molten salt, and Na3TiF6 Or K3TiF6 is added to molten salt, the valence of titanium in molten salt electrolysis process is controlled to +3, under high-purity argon atmosphere, at 973K, after molten salt electrolysis, metal titanium is deposited on cathode, and anode forms metal silicon powder.The present application first provides a kind of method for separating silicon titanium intermediate alloy obtained by reducing titanium oxide containing slag with silicon into metal titanium and metal silicon powder, realizes the clean utilization of titanium oxide containing slag or waste.
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