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研究报告

The leaching of tungsten and vanadium from spent selective catalytic reduction catalyst

摘要：废SCR脱硝催化剂中钨和钒的浸出是实现其回收的关键.采用碳酸钠混合焙烧-稀硫酸浸出法，对废SCR脱硝催化剂中金属钨和钒的浸出实验进行了研究，考察了焙烧温度t₁（℃）、焙烧时间t₂（h）、硫酸浓度c（v/v）、液固比w、浸出温度t₃（℃）、浸出时间t₄（h）、Na₂CO₃与催化剂的质量比m（Na₂CO₃）/m（催化剂）等因素对钨和钒浸出率的影响.结果表明，在t₁为800℃、t₂为3 h、c为2%、w为8：1、t₃为80℃、t₄为4 h、m（Na₂CO₃）/m（催化剂）为1.2的反应条件下，废SCR脱硝催化剂中钨和钒的浸出率可分别高达99.08%、98.49%，为后续钨和钒的高效提取与回收提供了有利的条件.

Abstract：the leaching of tungsten and vanadium,which was the key process to recover the metalsfrom spent SCR catalyst, was investigated using the method of roasting the mixture of sodium carbonate and catalyst-sulfuric acid. The influences of roasting temperature t₁, roasting time t₂, sulfuric acid concentration c, liquid to solid ratio w, leaching temperature t₃, leaching time t₄ and the amount of Na₂CO₃ on the leaching rate were investigated during the roasting and leaching processes. The results show that the leaching rates of W and V reach as high as 99.08% and 98.49%, respectively, when the catalyst particles were roasted at 800℃ for 3 h after adding 1.2 Na₂CO₃, m(Na₂CO₃)/m(catalyst). The agglomerate was then dissolved in 2% (V/V) sulphuric acid at 80℃ for 4 h and the liquid to solid ratio was 8∶1. This study could provide a good basis for the further studies of tungsten and vanadium recovery.