Removal of organic matter from H₂TaF₇ solution by adsorption

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 0.0010%–0.0015% from 0.0025%–0.0030%. 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 H₂TaF₇ solution and the carbon content in K₂TaF₇ crystal, and the carbon content in K₂TaF₇ crystal decreases with the decreasing of COD value of H₂TaF₇ solution. When the COD value of H₂TaF₇ solution is lower than 7 mg/L, the carbon content in K₂TaF₇ crystal would decrease to less than 0.0015%.

Keywords

tantalum / organic matter / adsorption / removal

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