钼碚砂氨浸过程中钾的释放行为与控制研究  

Literature Review on Sintering Process Simulation and Energy Consumption Optimization

作　　者：刘起航[1] 杨泽邦 王苗[1] 冯卫国[2] 杨双平[1] LIU Qihang;YANG Zebang;WANG Miao;FENG Weiguo;YANG Shuangping(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;Jinduicheng Molybdenum Co.,Ltd.,Xi′an 710077,China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055 [2]金堆城钼业股份有限公司,西安710077

出　　处：《有色金属工程》2024年第4期71-82,共12页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(52374345);陕西省自然科学基金资助项目(2022JQ-302)。

摘　　要：低钾钼产品在电子、医疗等领域具有广泛的应用前景,而氨浸对低钾钼产品的生产具有十分重要的影响。为了更好地控制氨浸过程中钾的释放量以减少后续工艺中的降钾压力,通过对钼焙砂氨浸过程中的释钾影响因素进行了单因素模拟实验,分析了钾元素的释放规律,并给出了其动力学模型和控制方法。结果表明,温度、固液比、钼焙砂粒度等对钾元素的释放具有较大的影响,最佳的氨浸条件为:温度30℃、固液比1∶3,钼焙砂粒径范围150~178μm,氨水浓度20%。此外,Ca元素更利于氨浸过程除钾,而Na元素不利于氨浸过程除钾。熟石灰对水洗除钾有一定作用,碳酸钠对水洗除钾的效果并不明显,故在钼焙砂水洗过程中加入熟石灰有利于低钾钼酸铵的生产。钼焙砂氨浸过程前期释钾速度较快,后期速度变慢,得到Avrami方程可以较好地模拟氨浸前期和后期的释钾过程,确定了氨浸过程的动力学方程。Low-potassium molybdenum products have a wide range of applications in electronics,medical and other fields,and ammonia leaching shows a noteworthy impact on the production of low-potassium molybdenum products.To better control the amount of potassium released in the ammonia leaching process and reduce the pressure of potassium reduction in the subsequent process,this paper analyzed the potassium release law and gave its kinetic model and control method by conducting a one-factor simulation experiment on the influencing factors of potassium release in the ammonia leaching process of molybdenum bakery sand.The results show that the temperature,solid-liquid ratio and molybdenum roasting sand grain size have great influence on the release of potassium,and the optimal conditions for ammonia leaching are:temperature 30℃,solid-liquid ratio 1∶3,molybdenum roasting sand grain size ranging from 150-178μm,and ammonia concentration of 20%.In addition,Ca element is more favorable for potassium removal in the ammonia leaching process,while Na element is not favorable for potassium removal in the ammonia leaching process.After slaked lime has a certain effect on potassium removal in water leaching,the effect of sodium carbonate on potassium removal in water leaching is not obvious,so the addition of slaked lime in molybdenum roasted sand water leaching process is favorable to the production of low-potassium ammonium molybdate.Molybdenum roasted sand ammonia leaching process in the early stage of potassium release speed is faster,and the late stage of the speed becomes slower,the Avrami equation can be obtained to better simulate the process of potassium release in the early stage and late stage of ammonia leaching,and the kinetic equation of the ammonia leaching process was determined.

关 键 词：钼焙砂 氨浸 除钾 动力学 钾释放 

分 类 号：TQ113.7[化学工程—无机化工]