Method for treating waste fused salt produced in production of TiCl4

Abstract

The invention discloses a method for treating waste fused salt produced in production of TiCl4, and relates to a method for treating waste fused salt. The method comprises the following steps of: performing heat preservation on the waste fused salt discharged out of a furnace so that the waste fused salt is divided into an upper coke layer, a middle fused salt layer and a lower oxide layer; performing layer-by-layer separation, and removing iron, manganese and magnesium from the fused salt of the middle layer, wherein one part of fused salt is used as electrolyte for smelting magnesium by an electrolytic process; performing heat preservation, cooling, water dissolution and Na2CO3 or Na2SO4 treatment on the other part of fused salt, then reclaiming or circularly using all the waste fused salt, and reclaiming Mn-Fe alloy, metallic manganese, metallic magnesium, chlorine and CaCO3 micro powder; and utilizing the waste heat of the waste fused salt, and treating wastewater containing Cl<->. The waste fused salt can be completely recycled, meanwhile, the Mn-Fe alloy, the metallic manganese, the metallic magnesium, the chlorine and the CaCO3 micro powder can be reclaimed, the waste heat of the waste fused salt can be utilized, and the wastewater containing the Cl<-> can be treated.

Description

technical field [0001] The invention relates to a treatment method for waste molten salt, in particular to a method for producing TiCl 4 The processing method of the generated waste molten salt. Titanium Metallurgy for Nonferrous Metallurgy and Preparation of TiO by Molten Salt Chlorination 2 Comprehensive treatment and utilization of chlorination waste molten salt and Cl-containing wastewater. Background technique [0002] Molten salt chlorination has the following advantages: [0003] (1) When the powder is put into the furnace, there is no strict requirement on the particle size of the raw material. Compared with shaft furnace chlorination and continuous shaft furnace chlorination, pellet making and coking processes are omitted, thereby simplifying the preparation process of charge; [0004] (2) Vigorous stirring in the molten salt body strengthens the process of solid-liquid-gas three-phase heat transfer and mass transfer, so the unit productivity of the furnace is h...

AI Technical Summary

Problems solved by technology

[0010] (1) The amount of molten salt waste is large (per 1tTiCl produced 4 , about 100-200kg of waste molten salt), its treatment is more difficult, and because of the frequent discharge of salt, it will cause the loss of titanium and carbon;

[0011] (2) The waste molten salt cannot be processed and stored for a long time, and the harmful chloride contained in it will inevitably not cause environmental pollution;

However, during the production of sponge titanium and titanium dioxide, a large amount of molten salt waste residue will be produced in the molten salt chlorination production process. The composition of the molten salt waste residue is complex, and stacking takes up a lot of space, causing heavy pollution.

[0013] Since the main component of waste salt and waste residue is chloride, if it is not handled properly, the chloride will be volatilized and hydrolyzed, which will cause the deterioration of the surrounding water area and soil environment, and at the same time cause the loss and waste of a large amount of useful resources.

After the DuPont company in the United States dissolves and filters the chloride slag in water, the resulting filtrate is injected into the formation below 1600m through a special underground injection system. Although the injection has a considerable depth, once geological movement occurs, it may pollute the groundwater system and even cause pollution to the surface ecological environment.

In other foreign countries, some molten salt waste residues are buried in waste mines, and some are laid on wasteland with lime at intervals. In China, lime is stirred and neutralized before being stacked in slag yards. These methods all have potential pollution, such as polluting groundwater, Salinized land, etc., did not fundamentally solve the problem

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