论文部分内容阅读
为了减轻设备腐蚀,降低酸浸液中氯的含量及提高磷的含量,研究了磷钾伴生矿中的钾在HCl-H_3PO_4混酸溶液中的浸出动力学。考察了盐酸的质量分数、固液比、物料比(CaF_2添加量(g)与磷钾伴生矿质量(g)比)、浸出温度等几个因素对钾浸出率的影响,结果表明:在浸出温度95°C、盐酸浓度10%、浸出时间6 h、固液比1:6、物料比0.1的优化工艺条件下,钾浸出率可达86%以上。同时建立了基于经典缩合模型的半经验动力学模型,并用该模型成功地模拟了钾的浸出过程。结果表明:在65~95°C范围内,钾浸出过程属于内扩散控制步骤,表观活化能为54.67 kJ/mol。
In order to reduce the corrosion of equipment, reduce the content of chlorine in acid leaching solution and increase the content of phosphorus, the leaching kinetics of potassium in HCl-H_3PO_4 mixed acid solution was studied. The influence of several factors such as hydrochloric acid mass fraction, solid-liquid ratio, material ratio (CaF 2 addition amount (g) and phosphorus-potassium associated mineral mass (g) ratio) and leaching temperature on the leaching rate of potassium was investigated. Under the optimum conditions of temperature 95 ° C, hydrochloric acid concentration 10%, leaching time 6 h, ratio of solid to liquid 1: 6, material ratio 0.1, the leaching rate of potassium can reach more than 86%. At the same time, a semi-empirical dynamic model based on the classical condensation model was established and the leaching process of potassium was successfully simulated with this model. The results show that in the range of 65 ~ 95 ° C, the potassium leaching process belongs to the internal diffusion control step, and the apparent activation energy is 54.67 kJ / mol.