Method for selectively extracting and separating vanadium from vanadium-molybdenum waste residues

Abstract

The invention relates to a method for selectively extracting and separating vanadium from vanadium-molybdenum waste residues. According to the technical scheme, the method comprises the following steps that sodium carbonate, sodium sulfite and vanadium-molybdenum waste residue powder are mixed according to the mass ratio of (0.1-0.2): (0.01-0.03): 1 to obtain a reaction raw material; the reaction raw material and water are put into a reaction tank according to the solid-to-liquid ratio of 1: (1-2.5) kg / L, and stirring lasts for 2-6 hours under the conditions of 25-45 DEG C and 80-200r / min to obtain slurry after reaction; solid-liquid separation is carried out on the reacted slurry to obtain vanadium-containing leachate and leaching residues; oxygen is introduced into the vanadium-containing leachate for oxidation, and oxidized vanadium-containing leachate is obtained; and then 0.015-0.035 kg of ammonium chloride is added into each liter of the oxidized vanadium-containing leachate, stirring is conducted for 1-2 h, and ammonium metavanadate is prepared. The method has the advantages of being simple in vanadium extraction process, short in process flow, low in energy consumption and good in vanadium-molybdenum separation effect.

Description

technical field [0001] The invention belongs to the technical field of separating vanadium from vanadium-molybdenum waste residue. Specifically relates to a method for selectively extracting and separating vanadium from vanadium-molybdenum waste residue. Background technique [0002] A large amount of waste water is produced in the process of vanadium extraction from vanadium slag, and vanadium molybdenum waste residue is produced through chemical precipitation. This kind of waste residue contains valuable metal elements such as vanadium and molybdenum, which is a very valuable secondary resource; at the same time, because this kind of waste residue contains chromium , nickel and other heavy metal elements are hazardous solid waste. Landfilling vanadium and molybdenum waste slag will not only occupy a large area of ​​land resources, but also easily pollute groundwater and soil quality, and long-term storage will increase environmental risks. The problem of disposal of such ...

AI Technical Summary

Problems solved by technology

[0003] "A method for producing high-purity vanadium pentoxide by using vanadium-containing waste slag" (CN103924090B) patent technology, adding NaHCO to the vanadium-containing waste slag obtained by solid-liquid separation of vanadium-removing wastewater 3 , stirring and leaching, and CO 2 After ultrasonic treatment, filter and remove slag, pass O to the resulting solution 2 Oxidation, and then use concentrated sulfuric acid to adjust the pH and then add ammonium chloride for vanadium precipitation. Although the vanadium recovery rate of this technology is high, the process is complicated and the process is long. High consumption

[0004] "A method for treating bottom flow slag of vanadium-precipitated wastewater and wet method for extracting vanadium" (CN102719672B) patented technology, mixing bottom flow slag of vanadium-precipitated wastewater with alkaline vanadium liquid, which is sodium or calcified roasting product alkali The vanadium solution obtained after immersion, after removing impurities from the mixed solution, the vanadium-containing filtrate is obtained. Although the method is simple to operate, the roasting energy consumption is high, and it is difficult to obtain the alkaline vanadium solution.

[0005] "A resource recovery and treatment method for smelting wastewater sediment residue" (CN111534693A) patented technology, the vanadium smelting wastewater sediment residue and Na 2 CO 3 After mixing, it is baked in a microwave environment, and then ultrasonic water immersion is used to obtain a vanadium and molybdenum leaching solution through solid-liquid separation. This technology adds Na 2 CO 3 Roasting converts vanadium and molybdenum compounds into easily soluble vanadate and molybdate, so that vanadium and molybdenum can be leached synchronously, but it is difficult to separate vanadium and molybdenum later, and the amount of sodium carbonate added (20-50% of the mass of the precipitated slag) is large , It is difficult to treat wastewater after flooding

[0006] Although the above technologies have well-known advantages, there are also problems such as complex extraction process, long process flow, high energy consumption and difficult separation of vanadium and molybdenum.