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.

中文翻译：

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N1923萃取低品位软锰矿残液浸出钛白废酸回收钛

钛白粉行业每年都会产生大量的钛白废酸。本工作为充分利用和回收钛白废酸中的有价值成分，提出了N1923萃取低品位软锰矿残液浸出钛白废酸回收钛工艺。经过两级逆流萃取，在 N1923 浓度为 25%、相比（O/ A) 的 2/1。铁的洗涤效率达到98.53%，而钛的损失效率在1/1的相比下在1.5 mol/L的硫酸溶液中仅为0.94%。然后，负载Ti的有机相可以被0.8 mol/L的氨水有效地汽提；钛单级剥离效率为99.23%。随后，萃余液可用于从低品位软锰矿中提取锰。在S/L比为48.00 g/L、浸出温度为50℃、浸出时间为40 min时，锰的浸出率为99.39%。此外，热力学计算表明，N1923从钛白废酸中提取钛的过程是放热反应。该方法适用于钛白废酸中钛和低品位软锰矿中锰的共回收。热力学计算表明，N1923从钛白废酸中提取钛的过程是放热反应。该方法适用于钛白废酸中钛和低品位软锰矿中锰的共回收。热力学计算表明，N1923从钛白废酸中提取钛的过程是放热反应。该方法适用于钛白废酸中钛和低品位软锰矿中锰的共回收。