Recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate

Abstract

Titanium 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.

Sustainable Selective Recovery of Sulfuric Acid and Vanadium from Acidic Wastewater with Two-Step Solvent Extraction

“…As the pH value of the solution increased, the influence of iron ions was most significant, which was consistent with the results of this study. , The extraction effects of aluminum and titanium were not significant, which may be related to the existing forms of various metal ions in the sulfuric acid medium. Generally, the extraction and separation of titanium were mostly carried out using extractants such as N1923 and Cyanex 923. , Therefore, P507 was chosen as the extractant for the recovery and separation of vanadium in this study.…”

“…Generally, the extraction and separation of titanium were mostly carried out using extractants such as N1923 and Cyanex 923. 30 , 31 Therefore, P507 was chosen as the extractant for the recovery and separation of vanadium in this study.…”