| The geological reserve of dispersed element tellurium is little and it has very limited production. Industrial production of tellurium which global annual production is less than1000tons is mainly from copper anode slime. But tellurium in many fields has very important application, especially in the fields of the new energy and materials. Lead alloys with tellurium can be used in the production of submarine cables and nuclear radiation protection material. Tellurides are used in solar power materials production and tellurium manganese mercury which has entered the industrialization production of infrared detection material is so far the only mature material. Besides, drugs containing tellurium can be used for the cure of leukemia. But confronting with such an important role of the element tellurium, there are still many shortcomings. A great deal of tellurium slag has been produced in some place of our country. Large numbers of researches revealed that processing cost of metallurgy for the slag was too much and it couldn’t be carried out for the utilization of the slag and resulted to accumulate largely.The paper set the Te slag as objective and was carried out based on the study of process mineralogy. The slag was researched by gravity separation, magnetic separation and flotation. The flotation reagent system was studied and it analysed the mechanism of agents. Then the gravity and magnetic separation were studied. Finally it was determined that the combined method of flotation, gravity separation and magnetic separation to deal with the slag. The main results were as follows:1. Mineralogical study of the slag found that the slag was composed of mineral particles, where the main tellurium mineral was the tetradymite and main minerals were quartz, feldspar, pyrrhotite, pyrite, dolomite.2. Through the study of the flotation reagent system, the optimum flotation conditions were determined:grinding fineness of-200mesh85%, collecting6mininutes, using lime to adjust pH, adding water glass and lead nitrate, using Y-89as the collector.3. It was revealed that gravity recovered parts of the tetradymite, but the total recovery rate and the Te grade of gravity concentrates were a little low. Magnetic separation could not be used for separating directly the slag, but could improve the grade of gravity concentrates.4. The concentrates were archived by flotation, gravity and magnetic separation, with the total Te recovery rate of44.74%and the average Te grade of1.71%. Processed products which met the requirements of metallurgy extracting reached the objective of transforming wastes into treasures. |
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