Abstract
AbstractTitanium dioxide industry produces a large amount of titanium white waste acid every year. In this work, to make full use of and recover valuable components in titanium white waste acid, a processing for recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate was proposed. After a two‐stage countercurrent extraction, 99.93% Ti was extracted, while 6.51% Fe, .11% Mg, .06% Mn, and .08% Al were co‐extracted under N1923 concentration of 25% and phase ratio (O/A) of 2/1. The scrubbing efficiency of iron reached 98.53%, while the loss efficiency of titanium was only .94% with 1.5 mol/L sulfuric acid solution under the phase ratio of 1/1. Then, the Ti‐loaded organic phase could be effectively stripped by .8 mol/L ammonia water; the single‐stage stripping efficiency of titanium was 99.23%. Subsequently, the raffinate could be used for the extraction of manganese from low‐grade pyrolusite. The leaching efficiency of manganese was 99.39% at the S/L ratio of 48.00 g/L, leaching temperature of 50°C, and leaching time of 40 min. In addition, thermodynamic calculations revealed that the titanium extraction process by N1923 from titanium white waste acid was an exothermic reaction. The proposed approach is suitable for co‐recovery of titanium from titanium white waste acid and manganese from low‐grade pyrolusite.
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