Method for recycling vanadium from vanadium-containing steel slag

A steel slag and tailing slag technology, applied in the field of vanadium recovery, can solve the problems of difficult separation, reduce waste water production and discharge, and low leaching rate, and achieve the effects of reducing reaction temperature, raw material cost, and production cost
CN102586613AInactive Publication Date: 2012-07-18HEBEI IRON AND STEEL
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEBEI IRON AND STEEL
Publication Date
2012-07-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for recycling vanadium from vanadium-containing steel slag, which comprises the following steps, (1) reaction: the vanadium-containing steel slag is reacted in NaOH solution with the mass concentration being 10%-50%, and reaction slurry is obtained; the mass ratio of the NaOH solution to the steel slag is (3:1)-(10:1), the reaction temperature is 180 DEG C to 350 DEG C, the reaction time is 0.5-10h, and the reaction pressure is 0.3-12MPa; (2) dilution: the reaction slurry is diluted through a diluent so as to enable the concentration of sodium hydroxide in the slurry to be 100-400g / L, and mixed slurry is obtained; (3) solid-liquid separation: solid-liquid separation is carried out to the mixed slurry, and calcium-rich tailings and dissolved-out liquid are obtained; (4) impurity removal: a desiliconization agent is added into the dissolved-out liquid to perform impurity removal, then solid-liquid separation is performed, and impurity-removed liquid and silicon-containing slag are obtained; and (5) crystallizing: the impurity-removed liquid is cooled and crystallized, and a sodium vanadate product is obtained. The method effectively reduces production cost of vanadium, and the vanadium leaching rate can be 99%.
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Description

technical field

[0001] The invention belongs to the field of vanadium-containing chromium slag hydrometallurgy and vanadium chemical industry, in particular to a method for recovering vanadium from vanadium-containing steel slag. Background technique

[0002] Vanadium-containing steel slag is a by-product of smelting vanadium-titanium magnetite, which is formed by vanadium-containing molten iron steelmaking. 2 o 5 In the 2% to 10% steel slag (compared with vanadium slag, its calcium content is larger), there are two ways to produce it. One is that the vanadium remaining in the semi-steel is oxidized into the slag after steelmaking, and the other is that Vanadium-containing steel slag is obtained by direct steelmaking of molten iron without blowing vanadium slag. Vanadium-containing steel slag has the following characteristics: (1) high CaO and iron content, perfect crystallization, dense texture, and poor dissociation degree; (2) complex composition and large fluctuation;...

Claims

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