CAJ | 학술논문

利用双氧水易与钨形成可溶性过氧钨酸的特性，提出了双氧水(H 2 O 2)协同盐酸分解人造白钨(CaWO 4)的新工艺，使CaWO 4以氯化钙(CaCl 2)和过氧钨酸(H 4[WO 3(O 2)2])的形式溶解到浸出体系中，大幅提高了人造白钨的分解率。研究盐酸和双氧水浓度、反应温度、液固比及反应时间等因素对人造白钨分解效果的影响。结果表明：在H2O2存在的情况下，盐酸用量可大幅降低，所用的盐酸初始浓度很低故挥发损失很少；H2O2浓度的增加有利于反应的进行；当温度低于30℃时，升高温度对人造白钨的分解浸出有明显的促进作用，超过40℃后H 2 O 2会逐渐分解且产物过氧钨酸变得不稳定反而不利于浸出。得到的较优条件如下：H2O2浓度2.4 mol/L，盐酸浓度1.5 mol/L，温度30℃，液固比10：1(mL/g)，反应时间40 min。在此条件下，人造白钨实现了完全分解。
이용쌍양수역여오형성가용성과양오산적특성，제출료쌍양수(H 2 O 2)협동염산분해인조백오(CaWO 4)적신공예，사CaWO 4이록화개(CaCl 2)화과양오산(H 4[WO 3(O 2)2])적형식용해도침출체계중，대폭제고료인조백오적분해솔。연구염산화쌍양수농도、반응온도、액고비급반응시간등인소대인조백오분해효과적영향。결과표명：재H2O2존재적정황하，염산용량가대폭강저，소용적염산초시농도흔저고휘발손실흔소；H2O2농도적증가유리우반응적진행；당온도저우30℃시，승고온도대인조백오적분해침출유명현적촉진작용，초과40℃후H 2 O 2회축점분해차산물과양오산변득불은정반이불리우침출。득도적교우조건여하：H2O2농도2.4 mol/L，염산농도1.5 mol/L，온도30℃，액고비10：1(mL/g)，반응시간40 min。재차조건하，인조백오실현료완전분해。
A new process was proposed for the digestion of synthetic scheelite (CaWO 4 ) in hydrochloric acid solution using hydrogen peroxide (H2O2) as complexing agent. H2O2 as a chelating agent, can readily react with H2WO4 to form water-soluble peroxotungstic acid H 4 [WO 3 (O 2 ) 2 ], and the conversion rate of WO 3 was raised substantially. The effects of relevant parameters, such as the concentrations of HCl and H 2 O 2 , reaction temperature, liquid-to-solid ratio and reaction time, were studied. The results show that increasing the concentration of H 2 O 2 benefits the process and both the concentrate and consumption of HCl drastically drop and the volatility loss of HCl reduces noticeably. Elevating the temperature promotes the decomposition of CaWO 4 below 30℃while becomes unfavorable above 40℃because the stability of H 2 O 2 and peroxotungstic acid gradually decreases. The optimum process conditions are as follows: the concentrations of H 2 O 2 and HCl are 2.4 and 1.5 mol/L, respectively, the temperature is 30℃, the liquid-to-solid ratio is 10:1 (mL/g), and the reaction time is 40 min. Under these conditions the synthetic scheelite can be completely decomposed.