Coarse TiCl4 filtering method

Abstract

The invention provides a course TiCl4 filtering method, using TiAl intermetalic compound tubular filter membrane as filtering component, and the filtering course mainly comprises two steps of course TiCl4 filtering and regularly stripping, controlling the pressure range of course TiCl4 filtering at 0.10-0.20MPa, filtering course TiCl4 liquid flow through a filtering device with the TiAl intermetalic compound filter membrane so as to obtain high-grade filtrate, , stopping filtering after 30-90 min, stripping with stripping agent to remove suspended solid accumulated on the membrane, discharging the obtained entrapped matters into a densifier for settlement separation and after the stripping ends, resuming filtering, where the stripping pressure is higher than the filtering pressure and the stripping time is 5-30 s, the stripping can use TiCl4 filtrate as stripping agent, dry air, nitrogen gas, or argon gas as stripping agent, and the gas-liquid mixture of TiCl4 filtrate and dry air (nitrogen gas, or argon gas) as stripping agent.

Description

technical field [0001] The present invention relates to industrial TiCl 4 production, especially involving TiCl 4 Crude TiCl during production 4 filter materials and methods. Background technique [0002] TiCl 4 It is an intermediate material for the production of sponge titanium and titanium dioxide, and the crude TiCl obtained by reducing chlorination with high titanium slag 4 The liquid contains a large amount of AlCl 3 , FeCl 3 , MgCl 2 Such as solid impurities, must be filtered to remove solid suspended matter before refining with physical methods (distillation and rectification) and chemical methods. At present, the crude TiCl in industry 4 After filtration, according to the possible conditions of the prior art, the solid-to-liquid ratio is generally required to be less than 0.5%. Crude TiCl 4 The current method of liquid filtration is bag hydrostatic filtration. For example, a factory uses a pressure filter, which is equipped with 4 to 5 filter tubes, with Φ...

AI Technical Summary

Problems solved by technology

Crude TiCl 4 Cloth bag static pressure filtration will cause great harm to the operator and the surrounding environment when the filter cloth is replaced

Crude TiCl 4 Bag static pressure filtration not only has high production cost, but the filtration quality cannot be guaranteed, intermittent operation, low operation efficiency, and serious environmental pollution

People have been eager to solve this technical problem, and have designed and tested many different schemes (including ceramic microporous filters, etc.), but the results are not good, and they have not been adopted in production.

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