Extraction of vanadium and potassium compounds from the spent vanadium catalyst from the metallurgical plant

Krzysztof Mazurek

doi:10.2478/v10026-012-0070-9

Abstract

Extraction of vanadium and potassium compounds from the spent vanadium catalyst from the metallurgical plant A spent vanadium catalyst, from the plant of metallurgical type, was leached in a sulfuric acid solution to recover vanadium and potassium compounds. The effect of time, temperature, concentration of acid, catalyst particle size and phase ratio was studied. Additionally the concentration of iron, copper, zinc, arsenic and lead compounds was determined. The flow sheet for the proposed process of spent vanadium catalyst leaching is presented.

Highlights

Vanadium catalysts working in the industrial conditions are deactivated due to the changes occurring in their structure and texture[1,2,3,4,5,6,7,8,9,10,11,12,13,14]
The obtained yields for compounds occurring in the active phase of the catalyst are satisfactory from the technological point of view
Maximum degree of vanadium and potassium recovery from the used vanadium catalyst (91 and 97%) was achieved for the extraction conditions: 5% H2SO4, T = 323K, = 4h, S:L = 1:20, : less than 750 m

Summary

INTRODUCTION

Vanadium catalysts working in the industrial conditions are deactivated due to the changes occurring in their structure and texture[1,2,3,4,5,6,7,8,9,10,11,12,13,14]. The extent of deactivation is a function of time and conditions of the catalyst use, more rapid deactivation has been reported on for the catalysts used in acid plants at metallurgical plants and those used in the wet catalysis process. This is considered to be due to the metallic impurities such as: Fe, Pb, Zn, Hg, Cd and As. The amount of that waste, which could be estimated as close to 3 thousand Mg in Poland, and their composition indicate the necessity of the research on developing the method of their complex utilization.

Analytical methods

RESULTS AND DISCUSSION

SUMMARY