Combined technology for separating and extracting vanadium from high calcium and high ferro steel scoria

Abstract

A metallurgic combination process for extracting vanadium from high-calcium high-iron steel residues relates to a method for extracting vanadium, in particular to a method for extracting vanadium from the waste steel residues with the metallurgic combination process. The steps of the process are as follows that the high-calcium high-iron steel residues are crushed and the reelection pattern is adopted for stripping down light calcium and other nocuous impurities; the refined ore is directly extracted with 95 to 98 percent concentrated sulphurinc acid and then the process of solid-liquid separation is implemented; the extracted liquid is oxidated and the acidity of the liquid is regulated to make the pH value be 1.4 to 2.5; the redox potential is -900mv to -300mv; by adopting the extraction of more than three grades, the extraction phase ratio of O / A is 1 / 8 to 1 / 1 and the water phase is unloaded; the load is organically washed and iron is stripped down to effectively realize iron-vanadium separation; the detergent is sulfate; the alkaline solution of 0.25 M to 1.5M is used for the reverse extraction agent for reverse extraction and the phase ratio O / A is 1 / 1 to 8 / 1; the process of acidic precipitation of vanadate-leaching Solution is implemented on the reverse extraction solution. The invention has simple process and can effectively extract vanadium from the high-calcium high iron steel residues; in this way, the invention is characterized by low cost, little pollution and high recovery rate.

Description

technical field [0001] The invention relates to a metallurgical method for extracting vanadium, in particular to a method for extracting vanadium from waste steel slag by a combination process of separation and metallurgy. Background technique [0002] Vanadium-containing steel slag is produced in the steelmaking process of vanadium-containing molten iron, which is characterized by high calcium oxide and iron content and low vanadium content. In addition, vanadium-containing steel slag has a complex form of vanadium, and all vanadium is dispersed in a variety of mineral phases, making it difficult to directly select, smelt and separate, so it is extremely difficult to extract vanadium from high-calcium and high-iron vanadium-containing steel slag. [0003] The total annual discharge of steel slag in my country reaches several million tons. Due to the wide source and large amount of vanadium-containing steel slag, if the vanadium-containing steel slag is economically and rati...

AI Technical Summary

Problems solved by technology

The most notable feature of trivalent Fe in aqueous solution is its strong hydrolysis tendency and the ability to form complexes. Therefore, the loss of vanadium is relatively large when the iron is hydrolyzed.

It can be seen that the conventional method uses sodium carbonate or sodium hydroxide to adjust the pH value of the solution to make Fe 2+ , Fe 3+ The idea of ​​impurity removal and purification by waiting for cations to generate hydroxide precipitation is too limited, and when the solution is adjusted to neutral or alkaline, a large amount of alkaline substances need to be consumed, and the solution must be concentrated after impurity removal, so its production cost is high. The production process is difficult to control

[0007] Although there are many existing techniques for extracting vanadium from solid waste, they generally have the disadvantages of high cost, heavy pollution, low recovery rate and incapable of large-scale treatment. The popularization and application are limited, and the applicability to high-calcium and high-iron steel slag is relatively small.

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