| The main characteristic of Lead-zinc resources in our country is of less rich ore, many low-grade ore, fewer large-scale mines, more small and medium-sized mines, and elements associated with complex types of ore. When selecting the wanted ore, there are many other valuable metals in the tailings too. When the huge number of the tailings piles up, they can cause many problems to the mines, environment and economy, and also put great impact on the mining environment and geochemistry of the ecological environment around. Therefore, how to maximally extract the valuable elements from the tailings and minimize the producing of tailings till there are no tailings out is an urgent and important subject. This paper, based on many related literature, analyzed and summarized the meaning, status, way and existed problems of comprehensive utilization of tailings.In this paper, the researching object is Longquan lead and zincs mine tailings of Zhejiang Jiahe Mining Co., Ltd., and the point is to recycle the pyrrhotite in the lead and zinc mine tailings to reach the purpose of the comprehensive utilization of resources.At present, the company has piled up lead and zinc mine tailings more than 2,800,000 tons in the city of Longquan, Zhejiang Province. With the deeper exploitation of the northern mine, the pileup of the tailings keep increasing. And it has become a great source of danger to the local and downstream villagers. After the success of the study and implementation of the project, when developing and utilizing of lead and zinc resources, can also recycle sulfur, iron and other valuable elements in the waste tailings with mineral selecting technology, and then bake and extract sulfuric acid and iron ore through the boiling furnace. After refining, the waste can be used as cement or made to hollow brick. The sulfur, iron recycling of Longquan lead-zinc tailings is a key research project, and has included in the major scientific and technological projects, "the key lead-zinc tailings disposal technology research." in Zhejiang Province.This paper is a comprehensive and systematic study on recycling pyrrhotite in Longquan lead and zincs mine tailings. And in research of selecting ore, the researcher found that re-election should not be used in this tailings, as well as magnetic separation and re-election combined magnetic methods. The use of re-election mud off after the pilot flotation can be a good recycling method. After lots of condition tests, and used one-factor test to explore the mesh of grinding,regulators dosage, collectors type and amount and flotation time on the recycling indicators. The result shows that the right process is flotation tailings after the re-election and mud off, the mesh of grinding about 80%-0.074mm, and using the ordinary sulfide,butyl xanthate and Pine Camphor Oil to do a re-election and mud off. After a roughing, two sweeping, and three scavenging operation in the closed circuit, can get sulfur grade of 32.77%,42.73% iron grade,eligible products,which the sulfur recycle rate is 81.26%, on the basis of 4.42% grade,16.28% iron grade in the primary ore. The results all exceeded the required project indicators.In this study, through recycling of pyrrhotite from lead and zinc mine tailings, not only solve the environmental problems brought by the tailings, but also the realization of solid waste tailings resources, it has great significance on the protection of the ecological environment, and the practice of recycling economy. |
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