Removal of organic matter from H₂TaF₇solution by adsorption^①

来源期刊：中南大学学报(英文版)2005年第1期

论文作者：李青刚 周康根 张启修

文章页码：55 - 59

Key words：tantalum; organic matter; adsorption; removal

Abstract: The removal of organic matter from H₂TaF₇ solution by adsorption was investigated in order to reduce the carbon content in the K₂TaF₇ crystal. Three kinds of adsorbent, LSA-5 resin, LSA-20 resin and active carbon were applied in the fixed bed respectively. Experimental results indicate that LAS-5 resin, LAS-20 resin, the mixture of LAS-5 resin and LAS-20 resin(with volume ratio of 1∶1), and the active carbon can all reduce chemical oxygen demand(COD) value of the H₂TaF₇ solution, and reduce consequently carbon content of K₂TaF₇ crystal to 0.001 0% 0.001 5% from 0.002 5% 0.003 0%. Comparing with the others, the active carbon is an approved adsorbent whose bed volumes of effluent reaches 70. In addition, there is a linear relationship between the COD value of H₂TaF₇solution and the carbon content in K₂TaF₇ crystal, and the carbon content in K₂TaF₇crystal decreases with the decreasing of COD value of H₂TaF₇solution. When the COD value of H2TaF7solution is lower than 7 mg/L, the carbon content in H₂TaF₇ crystal would decrease to less than 0.001 5%.