风化型稀土矿电阻率影响因素分析及模型构建

Analysis of Influencing Factors and Model Construction of Electrical Resistivity of Weathered Crust Elution-deposited Rare Earth Ore

为了探明影响风化型稀土矿电阻率的主要因素及构建电阻率模型,采用室内电阻率试验和响应曲面法相结合的研究手段,分析含水率、饱和度、干密度、孔隙比以及颗粒级配对电阻率的影响规律,建立主要影响因素与电阻率的关系方程,并探讨其合理性和可靠性。结果表明:含水率、孔隙比和颗粒级配是影响风化型稀土矿电阻率的主要因素,且影响敏感程度顺序为含水率>孔隙比>颗粒级配;其中矿样电阻率随含水率增大而减小,当含水率≤10%时,电阻率下降幅度最大,而当含水率大于10%时,电阻率下降趋势变缓,并逐渐趋于稳定;矿样电阻率随孔隙比增加而增大;矿样电阻率随分形维数增加而减小,且当含水率较大时,分形维数对其影响程度较小。通过多元二次回归分析构建的风化型稀土矿电阻率模型,理论数据与试验数据基本吻合,具有较高的合理性和可靠性,在含水率23.67%、孔隙比1.73、分形维数2.47条件下的电阻率最小。

In order to explore the main influencing factors of electrical resistivity of weathered crust elution-depositod rare earth minerals and construct electrical resistivity model,the combination of electrical door resistivity test and response surface method was introduced in this paper to analysis the influence of moisture content,saturation and dry density,void ratio and grains gradation matching the influence law of electrical resistivity,establishing main influence factors and the relationship equation of electrical resistivity,and discuss the rationality and reliability.The results show that moisture content,void ratio and grains gradation are the main factors affecting the electrical resistivity of weathered crust elution-depositod rare earth minerals,and the order of sensitivity is Moisture content>Void ratio>Grains grade.The electrical resistivity of ore samples decreases with the increase of moisture content.When the moisture content is less than 10%,the electrical resistivity decreases the most,while when the moisture content is more than 10%,the electrical resistivity decreases slowly and gradually becomes stable.The electrical resistivity of ore samples increases with the increase of void ratio and decreases with the increase of fractal dimension,and the effect of fractal dimension on it is small when the moisture content is large.The resistivity model of weathered rare earth ore constructed by multiple quadratic regression analysis is basically consistent with the experimental data and has high rationality and reliability.The resistivity is the lowest under the conditions of water content of 23.67%,void ratio of 1.73 and fractal dimension of 2.47.