A kind of vanadium-containing steel slag pressure strengthening method for vanadium extraction

Abstract

The invention relates to a pressurization intensified method for vanadium contained steel slag. The method includes the steps that a sodium carbonate and sodium hydroxide mixing solution and the vanadium contained steel slag are mixed, a leaching reaction is made under the heating and pressurization condition, and mixed slurry is obtained after the reaction is completed; and the obtained mixed slurry is subject to solid-liquid separation, and tailings and vanadium contained lixivium are obtained. According to the pressurization intensified method, efficient vanadium extraction from the vanadium contained steel slag can be achieved, the vanadium leaching efficiency is higher than or equal to 85%, and the highest vanadium leaching efficiency can reach 95% or above. According to the pressurization intensified method, the direct pressurization leaching method is adopted for extracting vanadium in a vanadium raw material, energy consumption in the roasting process can be saved, and roasting harmful kiln gas is prevented from being generated; and the obtained lixivium containing the vanadium can be circulated for leaching the steel slag, and no waste water is discharged out in the overall process; and the pressurization intensified method is an efficient and clean vanadium extraction method, is suitable for industrial production and has the good application prospect.

Description

technical field [0001] The invention relates to the technical field of vanadium chemical metallurgy, in particular to a method for extracting vanadium by pressurizing steel slag containing vanadium. Background technique [0002] Vanadium-containing steel slag is a by-product of smelting vanadium-titanium magnetite, and is formed by vanadium-containing molten iron steelmaking. 2 o 5 In 2-10% steel slag (compared with vanadium slag, its calcium content is larger), there are two ways to produce it, one is that the residual vanadium in the semi-steel is oxidized into the slag after steelmaking, and the other is that it is not The vanadium-containing steel slag is obtained by direct steelmaking by blowing the molten iron of the vanadium slag. Vanadium-containing steel slag has the following characteristics: (1) high content of CaO and iron, perfect crystallization, dense texture, and poor dissociation degree; (2) complex composition and large fluctuation; (3) low vanadium conte...

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Problems solved by technology

However, this method only stays in the stage of laboratory research, and the proportion of phosphate is large, the cost is high, and there is no industrial promotion at present.

Direct acid leaching refers to the complete wet extraction of vanadium without roasting process, but due to the high content of CaO in steel slag, the acid consumption is large and the cost is high; Difficult for subsequent separation

[0004] CN 102071321 A proposes a method for extracting vanadium and chromium from vanadium-containing steel slag using a high-basic potassium hydroxide medium. This method does not require high-temperature roasting, and the reaction temperature is reduced to 160-240 ° C. The wet method extracts vanadium and chromium. effectively eliminates C1 2 , HCl, SO 2 , dust and other air pollutants, and reduce the amount of wastewater produced and discharged; the disadvantage is that the KOH medium is expensive, and the mass ratio of KOH to steel slag is 3:1 to 5:1, and the reaction alkali concentration is 60%-90%. The loss of KOH medium is more, resulting in higher production costs and lower product benefits

[0005] CN 102094123 A proposes a method for extracting vanadium from vanadium-containing steel slag using a high-concentration sodium hydroxide medium. The reaction temperature of this method is 180-240°C. Vanadium is extracted by wet method, and there is no waste gas and dust pollution in the process; the disadvantage is The alkali concentration is too high, and the alkalinity is 65%-90%, which will lead to higher heat required for evaporation and concentration during medium recycling, resulting in higher production costs, and the residual V in the final slag is higher, and the leaching rate is not high. , the V content in the final slag is 0.3%-0.5%

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