Method for extracting vanadium and removing arsenic from arsenic-containing waste sulfuric acid catalyst

Abstract

The invention provides a method for extracting vanadium and removing arsenic from an arsenic-containing waste sulfuric acid catalyst. The method for extracting vanadium and removing arsenic from the arsenic-containing waste sulfuric acid catalyst comprises the following steps that (1) a hydrothermal reaction is performed, specifically, the pretreated arsenic-containing waste sulfuric acid catalystand an alkaline solution are evenly mixed and subjected to the hydrothermal reaction, liquid-solid separation is conducted on the material obtained after the reaction, and the obtained liquid phase is leachate; and (2) arsenic is removed from the leachate, specifically, an acidifying/alkalizing agent and an arsenic removing agent are added into the leachate of the step (1) to be mixed and stirred, then filtering is conducted, and purified vanadium liquid is obtained. The leachate obtained through the hydrothermal reaction between the arsenic-containing waste sulfuric acid catalyst and a sodium hydroxide solution or a sodium carbonate solution contains a large quantity of arsenic element, the arsenic element in the leachate can be converted into precipitate by adding the arsenic removing agent, and meanwhile impurity elements such as silicon and phosphorus are removed, so that the purpose of clean production is achieved; and the technological process is short, equipment is simple, andindustrialization is easily realized.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a method for extracting vanadium and removing arsenic from waste sulfuric acid catalyst containing arsenic. Background technique [0002] Sulfuric acid is a basic chemical raw material, and my country's sulfuric acid output ranks first in the world. Sulfuric acid catalyst is a catalyst used in the production of sulfuric acid, usually containing vanadium pentoxide (V 2 o 5 ) 5% to 10%, which is the main component with catalytic activity. In the production of sulfuric acid, after long-term use and heat damage, the physical structure changes, so that the sulfuric acid catalyst that is aged and loses its activity, does not play a catalytic role and is replaced, is called waste sulfuric acid catalyst. The reasons for sulfuric acid catalyst deactivation are: (1) the impact of water acid mist and mine dust: pure water vapor has little effect on the catalyst, but if mixed with S...

AI Technical Summary

Problems solved by technology

The reasons for sulfuric acid catalyst deactivation are: (1) the impact of water acid mist and mine dust: pure water vapor has little effect on the catalyst, but if mixed with SO 3 Combined to generate acid mist, and then interact with mine dust to generate iron sulfate and crust, increasing ventilation resistance

(2) The influence of arsenic and fluorine: the high content of arsenic in the furnace gas can poison the catalyst and reduce the activity

However, this invention uses electrochemical precipitation to remove arsenic, which has high energy consumption and high production costs.

[0006] In order to extract vanadium and remove arsenic from waste sulfuric acid catalysts, people have done a lot of research. However, the existing technology for extracting vanadium from spent catalysts has the following problems: high-temperature roasting produces toxic waste gas, strong acid requires high equipment, and arsenic in the leach solution cannot be effectively treated. high production costs