湖南大根垄钨多金属矿地电提取法机理

笔者以湖南大根垄钨多金属矿为试验研究区,以20 m点距在已知矿体上方取土壤样,并按照24 h提取时间、1 000 mL HNO₃提取液、50 cm电极间距等工作条件进行了地电提取试验。结果表明,地电提取前后土壤中的元素含量变化不大,被提取到的金属元素应属土壤金属总量的一部分。次生晕与地电提取的异常形态对比发现:Co、Ni较清晰,W次之,Cr无异常;元素的异常特征主要取决于土壤中该元素的活性形式所占比例。综合分析认为地电提取异常与矿体的相对位置有关:矿体的下坡位置以及控矿断裂附近容易形成异常,距离原生矿体太近则会对异常有明显干扰。在本矿区,矿体风化程度越高对Co、Ni的地电提取异常越有利;其异常宽度一般比次生晕窄。

Mechanism of Geoelectrochemical Extraction from Dagenlong Tungsten Deposit in Hunan

In order to discover the mechanism and anomaly origin of geoelectrochemical extraction , an experimental study has already been conducted in Dagenlong Tungsten deposit in Hunan .We take soil samples by interval of 20 m ,and implement the geoelectrochemical extraction under the working conditions of the following three :the extracting time is 24 hours ,the dose of HNO3 is 1 000 mL ,and the distance between two electrodes is 50 cm . The result shows that the variation of metal element content is insignificant in soil after extracting ,and the extracted metal elements are proportional to the whole metal in the soil . The morphology comparison of anomaly between the geoelectrochemical extraction and the secondary halo shows that Ni and Co is clear ,W is less ,and Cr has no anomaly .The characteristics of anomaly mainly depend on the content proportion of element which is active in soil . Comprehensive analysis shows that the anomalies of geoelectrochemical extraction related to the relative position of the ore body .It is easy to form anomaly at downhill position ,and distance too close to native ore body have obvious interference to anomaly .In this ore deposit area ,the higher weathering degree , the better Co ,Ni anomaly of geoelectrochemical extraction .The anomaly width of geoelectrochemical extraction is smaller than secondary halo .