Method for regeneration and resource utilization of waste honeycombed denitrification catalyst

Abstract

The invention discloses a method for regeneration and resource utilization of a waste honeycombed denitrification catalyst. The method comprises the following steps of: crushing, grinding and sieving the waste catalyst; loading a mixture of the powdered catalyst and sodium carbonate into a sintering furnace to produce Na2WO4 and NaVO3, dissolving completely, adjusting the pH value to separate ammonium metavanadate precipitates, filtering, applying the remaining liquid to ammonium paratungstate extraction, washing the precipitates and oven-drying to obtain ammonium metavanadate, and making ammonium paratungstate crystals and tungsten trioxide. The regeneration method of the SCR catalyst comprises the following steps of: performing water-washing, pickling, activation and drying on the catalyst. The method for producing titanium pigment from the waste catalyst as raw material comprises the following steps of: performing pulverization, acidolysis and extraction on the waste catalyst, performing plate-frame pressure filtration; performing concentration, hydrolysis and suction-filtration on the catalyst, washing and blanching with sand leaching water, calcining, grinding and packaging. The method disclosed by the invention can effectively restore the activity of a deactivated catalyst and prolong the service life of the deactivated catalyst, which not only reduce the operating cost of a thermal power plant but also save the valuable rare earth resources.

Description

technical field [0001] The invention belongs to the field of catalyst regeneration, and in particular relates to a method for regeneration and resource utilization of a waste honeycomb denitration catalyst. Background technique [0002] Generally speaking, the SCR denitrification catalyst will partially fail after 3 years of use. In order to ensure that the denitrification efficiency target is met, 1 / 3 of it will be replaced every year. 3 of spent catalysts. If these spent catalysts are regenerated, huge economic and environmental benefits will be produced. Since 80% of the denitrification catalysts used in my country's thermal power plants are honeycomb catalysts, there is a great market potential for recycling invalid honeycomb catalysts. [0003] Since entering the "Twelfth Five-Year Plan", the country has put forward higher requirements for environmental protection and green development of energy economy, and has issued a series of plans, policies and standards for the...

AI Technical Summary

Problems solved by technology

The purpose of the embodiments of the present invention is to provide a method for the regeneration and resource utilization of waste cellular denitrification catalysts, aiming to solve the problem that catalyst regeneration technology is a new issue in our country. It has not yet realized commercial operation and is facing promising industry development and market. space problem

Images