Mineral Processing Technology And Mechanism Studies On Lead-zinc-silver Polymetallic Sulphide Ore

With the rapid development of China’s economy, there is an increasing demand oflead-zinc-silver metal, thus it is of great significance to strengthen the comprehensive utilizationof these mineral resources. However, the comprehensive recycling of lead-zinc-silverpolymetallic sulphides has long been a problem of comprehensive utilization of mineral resources.In the traditional process of the polymetallic sulphides recovery, lead and zinc, the main metalmineral, used to be recycled by using lime to inhibit pyrite under the condition of high alkali,causing many defects including the loss to the associated silver, the content of lead and zinc, andlow recovery rate,which is difficult to achieve the goal of effective comprehensive utilization ofmineral resources. In this paper,Through the study on the mechanism of lead zinc silver sulfideminerals as a guide,At the same time take ShaoXing YinShan lead zinc silver polymetallic sulfideore is taken as the research object.Research choose some other mechanism study guide practicalore, and then to provide the basis of finding more suitable comprehensive utilization method forlead zinc silver polymetallic sulphides mineral resources. The main content of the research are asfollows:By using pure mineral of galena, sphalerite and pyrite as the research object, flotationbehavior research was taken to look for the relationship between mineral flotability and pH valueand the relationship between the mineral and collector. The study results show that three kinds ofpure mineral has good flotability under the condition of acid, that galena has strong flotability inpH range of2.0~12.0, and that the flotability of sphalerite and pyrite began to reduce, especiallypyrite decline significantly, when the pH value is greater than9.0. Four collector(diethyldithiocarbamate, aniline aerofloat, butyl-amine aerofloat and butyl xanthate) were appliedto the three pure mineral, the selectivity of galena is shown as: aniline aerofloat>diethyldithiocarbamate> Butyl-amine aerofloat> butyl xanthate. The selectivity of anilineaerofloat to galena is lower than diethyldithiocarbamate, so diethyldithiocarbamate and anilineaerofloat can combined as a collector of galena to separate lead and zinc mineral; the collectingability of butyl-amine is best. When it’s dosage was a little, the selectivity was better. but whenthe dosage increased, the selectivity will be significantly reduced. therefore, the combination ofdiethyldithiocarbamate and butyl-amine aerofloat is in favor for improving the recovery rate oflead and silver minerals. but in the process of the application, the amount of butyl-amineaerofloat should be strictly controlled; Butyl xanthate, which has the very strong collecting abilityin the entire pH range, is advantageous to the sphalerite flotation recovery.The collector (diethyldithiocarbamate, aniline aerofloat and butyl-amine aerofloat) andminerals was analyzed by using modern testing technology.The results show that the adsorptionquantity of collector in the mineral surface has a close relationship with the slurry pH, and itschange rule is in accord with pure minerals flotation behavior rule of galena, sphalerite and pyrite. With medium pH value of9.0, the adsorbance of galena is the most to diethyldithiocarbamate,aniline aerofloat and butyl-amine aerofloat, and sphalerite, pyrite have a comparatively smallamount of adsorption of collector. Infrared spectrum analysis results showed that strong chemicaladsorption has occurred when aniline aerofloat effect on galena, but its ability to function onsphalerite is weak.The results showed that this analysis on mechanism of flotation reagents showed be using onMechanism of action with silver minerals recovery, the collecting agent (diethyldithiocarbamate,aniline aerofloat and butyl-amine aerofloat) the process used have a good collecting effect onsilver mineral, which is advantageous to the silver mineral flotation recovery; Use of combinationbetween zinc sulfate and sodium sulfite has a good inhibition on sphalerite, but it does not affectthe flotation recovery of silver minerals; Excessive dosage of lime is an inhibitor of pyriteeffectively but will produce certain inhibitory effect on silver minerals.According to the theoretical study and practical guidance of process mineralogy of ore, stageselectivelead flotation process is used to separate YinShan, haoXing lead zinc silver polymetallicsulfides. Small closed-circuit test obtained lead concentrate with lead grade of56.97%andrecovery of96.30%, silver grade of885g/t and recovery of77.46%, gold grade of6.28g/t andrecovery of56.97%, zinc distribution rate of1.78%and recovery of11.96%; zinc concentratewith zinc grade of47.13%and recovery of83.57%, lead grade of2.11%and the distribution rateof0.94%, silver grade of580g/t and recovery of13.44%, gold grade of4.80g/t and recovery of11.52%; Associated gold and silver mineral comprehensive recovery are respectively68.49%and90.90%, and comprehensive recovery index is better, achieving comprehensive recovery of thelead-zinc-silver polymetallic sulphides.