高杂质离子型稀土浸矿过程中硫酸铵用量参照依据

Reference basis of ammonium sulfate dosage during leaching process of high impurity ionic rare earth

采用数学统计方法分析了生产数据,研究不同参照依据和浸出率之间的关系:以福建某高杂质矿块为实验对象,进行不同浸矿剂用量工业实验;通过使用浸矿剂用量计算模型如化学平衡模型、修正DED模型和经验模型,评价不同参照依据和浸出率之间的相关性。结果发现:从经验模型看,阳离子交换总量单耗R^(2)_(qC)(0.99)>矿土体积单耗R^(2)_(qV)(0.96)>稀土质量单耗R^(2)_(qM)(0.94);从理论模型看,修正DED模型中,R^(2)_(qC)(0.91)>R^(2)_(qM)(0.90)>R^(2)_(qV)(0.86)。由此可认为,阳离子交换总量和浸出率之间相关性最好。在此基础上,分析三个参照依据产生的浸矿剂用量误差原因,发现在高杂质环境下,以阳离子交换总量作为参照依据产生的相对误差最小。因此,综合相关性评价结果及理论分析,建议选择阳离子交换总量作为高杂质离子型稀土矿的浸矿剂用量参照依据。

The amount of leaching agent for ionic rare earth ore is an important factor affecting the leaching rate,its reference basis determines the difference of estimated results.In the leaching process,the consumption of ammonium ions is related to the mass of rare earth,the volume of ore and the total amount of cation exchange,so these three factors can be used as a reference for the dosage of leaching agent.At present,the selection of reference basis in the industry relies more on traditional experience and lacks of evaluation of reference.In view of this problem,this paper adopts mathematical statistical method to the original leaching data,and studies the relationship between different reference basis and leaching rate:taking a ore block in Fujian Province,China as the experimental object,the experiment of injection with different dosages of leaching agent was carried out.Using the calculation model of leaching agent dosage,such as chemical equilibrium model,the modified DED model and experience model,the correlation between different reference basis and leaching rate were evaluated.The results show that,from the empirical model,R^(2)_(qC)(0.99)>R^(2)_(qV)(0.96)>R^(2)_(qM)(0.94),from the modified DED model,R^(2)_(qC)(0.919)>R^(2)_(qM)(0.90)>R^(2)_(qV)(0.86).Thus,it can be assumed that the correlation between the total cation exchange and leaching rate is the best.On this basis,the error causes of the amount of leaching agent produced by the three reference bases were analyzed.It is found that the relative error produced by the total cation exchange as reference basis is the smallest in the high impurity environment.Therefore,based on the correlation evaluation results and theoretical analysis,it is suggested to choose the total cation exchange as the reference basis for leaching agent dosage of high impurity ionic rare earth ore.