In the leaching process of chromium-containing precursor hexavalent chromium may form, which provokes damages to environment and human health. As a solution, leaching the chromium containing precursor with sulphuric acid to get chromium ions into solution without forming hexavalent ions has been proposed. These experiments are mostly carried out at high temperatures to increase the yield, while the detrimental effect of evaporation is still under investigation. In this study, indigenous ferro chromium alloys (> 60 wt% Cr) have been leached with sulphuric acid by using a rotary evaporator where no evaporation occurs. The acid molarity, solid:liquid ratio, temperature and rotation rate of the rotary flask have been optimized using Taguchi method to maximize Fe and Cr dissolutions’ efficiencies. Leaching in 5 M sulphuric acid solution with 1:50 solid:liquid ratio, at 90° C, 30 rpm for 150 min could sustain yields around 73% and 56% for Cr and Fe recoveries, respectively. Within the scope of this research, the effects of the mentioned parameters on the leaching efficiency have been also analyzed via the ANOVA method. The most effective parameter for Cr and Fe has been found as temperature and solid:liquid ratio, respectively. Finally, the kinetic has been also studied and universal equations have been successfully tested.–ln (1-x) = k tⁿ gives the best fitting result (where n = 0.4 and 0.6 are calculated for Fe and Cr, respectively). These values indicate that the leaching reaction follows the mixed kinetic control model. The activation energies are calculated as 46.12 kJ/mol for Fe and 142.8 kJ/mol for Cr.

在含铬前体的浸出过程中，可能会形成六价铬，从而对环境和人体健康造成损害。作为解决方案，已经提出了用硫酸浸出含铬前体以使铬离子进入溶液而不形成六价离子的方案。这些实验大多在高温下进行以提高产量，而蒸发的不利影响仍在研究中。在这项研究中，使用旋转蒸发仪在不发生蒸发的情况下，用硫酸浸提了原生铁铬合金（> 60 wt％Cr）。使用Taguchi方法对转瓶的酸摩尔浓度，固液比，温度和转速进行了优化，以最大程度地提高Fe和Cr的溶解效率。在1的5 M硫酸溶液中浸出 固液比为50，在90°C，30 rpm的条件下持续150分钟，对于Cr和Fe的回收率，产率分别可保持在73％和56％左右。在本研究的范围内，还通过ANOVA方法分析了上述参数对浸出效率的影响。Cr和Fe最有效的参数分别是温度和固液比。最后，还对动力学进行了研究，并成功地测试了通用方程。–ln（1-x）= kt 液体比例。最后，还对动力学进行了研究，并成功地测试了通用方程。–ln（1-x）= kt 液体比例。最后，还对动力学进行了研究，并成功地测试了通用方程。–ln（1-x）= ktⁿ给出最佳拟合结果（其中分别针对Fe和Cr计算n = 0.4和0.6）。这些值表明浸出反应遵循混合动力学控制模型。计算出的活化能对于Fe为46.12 kJ / mol，对于Cr为142.8 kJ / mol。