Study On Basic Properties And Comprehensive Utilization Of Lead And Zinc Tailings

The paper investigated the cumulative stock, additional amount, stacking and usingform of the lead and zinc tailings pond, in Southern Shaanxi. In the research, thechemical composition, mineral composition and particle size of samples had beenanalysed, and the lead and zinc tailings had been classified with different groups. Thestatic soaking experimental method of tailing shows that the tailing with the high heavymetal content is suitable to use as raw materials of construction. After soaking the sameamount of original tailings and the high-temperature-processed tailings, we measuredthe pH value and the leaching amount of heavy metals. In addation, We studied moldingprocess and calcined system of tailings to provide the parameters of using lead and zinctailings natural hydraulic lime. The conclusions are as follows:1)The survey results of lead and zinc tailings in Southern Shaanxi: the totaltailings accumulated amount over53million tons and with a more than2.9million tonsannual increasing. The highest stock of tailings is in Baoji （29.6million tons）, thenHanzhong （17.5million tons）. Shangluo （6million tons） has the lowest stock of tailings.The annual tailings increasing amount of Baoji （1.8million tons） was also the highest,then Hanzhong （0.82million tons）.Shangluo again has the lowest increasing amount（0.3million tons）.2)By detecting the radionuclide of lead and zinc tailings, the results showed thatthe tailings of Donghuanggou and八一companies could used as the constructionmaterials and class A decoration materials; Shan Ping Company’s tailings are suitable for the construction materials and Class A decoration materials which hole-rate greaterthan25%; the tailings of Aiyekou and Nanmu companies are suitable for Class Bdecoration materials; the Jinyuan company’s tailings are suitable for Class C decorationmaterials.3)The static soaking experiments are used for testing the tailing which has the highheavy metal content and is suitable for use as construction. The results show that thesolution can be either acidic or alkaline depending on the different lead and zinc tailingsoaked. Soaking with a long time will make soaking solution a stronger acidity. Ionicsolubility of the high temperature calcination of lead and zinc tailings is:Cu²⁺-0.1482mg/L、Pb²⁺-0.664mg/L、T-Cr-0.6103mg/L. Ionic solubility of the originaltailings is Cu²⁺-0.0321mg/L、Pb²⁺-not detected、T-Cr-0.0073mg/L. The release of Athigh temperature, the heavy metal ion can be easily solved, especially for the chromiumand lead ions.4)It is possible to produce the NHL fromthe lead and zinc tailings. The calciningprocess （1000℃,3h） is more suitable than wet ball calcining process （1100℃,5h） forprepare the natural hydraulic lime powder compact. Compressive strength of sinteringin1000℃（3h） and1100℃for （5h） can reach the standard value of NHL3.5and NHL5.