Method for separating vanadium from vanadium-chromium waste residue

Abstract

The invention relates to a method for separating vanadium from vanadium-chromium waste residue. According to the technical scheme, the method comprises the steps: sodium sulfite and sodium hydrogen sulfite are mixed according to the mass ratio of (1 to 4):1, and a reducing agent is obtained; vanadium-chromium waste residue powder and water are mixed according to the solid-to-liquid ratio of 1: (1to 2) Kg / L, and slurry is obtained; the slurry is added into a closed reactor, then the reducing agent is added into the closed reactor, stirring is conducted for 30-60 min under the conditions of 20-40 DEG C and 100-200 r / min, and reduced slurry is obtained, wherein the adding amount of the reducing agent is 3-9 wt% that of the vanadium-chromium waste residue powder; concentrated sulfuric acid isadded into the reduced slurry according to the ratio that 0.02-0.040 L of the concentrated sulfuric acid is added into the vanadium-chromium waste residue powder per kilogram, stirring is conducted for 1-4 h under the conditions of 20-40 DEG C and 200-400 r / min, and slurry after a reaction is obtained; and the slurry after the reaction is subjected to solid-liquid separation, and vanadium-rich liquid and chromium-containing leach residue are obtained. The method has the characteristics of high vanadium leaching rate, good vanadium-chromium separation effect and low energy consumption.

Description

technical field

[0001] The invention belongs to the technical field of resource utilization of vanadium chromium waste residue. Specifically relates to a method for separating vanadium from vanadium chromium waste residue. Background technique

[0002] Vanadium-chromium waste slag mainly comes from metallurgy, yellow phosphorus production and special steel smelting additive production enterprises, and is an important secondary resource containing vanadium. The chemical composition and structure of vanadium-chromium waste slag are greatly affected by the waste slag production process. At the same time, because the properties of vanadium and chromium are very similar, a large amount of chromium is easy to enter the leach solution during the process of leaching and extracting vanadium. In the absence of effective separation technology, most enterprises can only use landfill after detoxification.

[0003] At present, the process of extracting vanadium from vanadium-chromium wa...