拉么锌矿尾矿处理方案研究

Study of Tailings Disposal Scheme in Lame Zinc Mine

拉么锌矿选矿厂尾矿采用低浓度排放方式,面临能耗较高、外排废水量大、重金属离子超标、枯水期选厂生产用水紧张等问题,详细分析了拉么锌矿选矿厂尾矿处理现状。通过尾矿性质分析,得出尾矿成分、含量及尾矿以中细粒为主;借助尾矿沉降试验,测出尾矿浆达到良好沉降效果时絮凝剂的添加量;研究出了膏体制备的工艺流程及浓缩指标。同时对高浓度尾矿料浆进行塌落度试验及环管输送试验,对尾矿浆输送浓度、体积和速度进行测算,最终得出了合理的输送方案。制定了一套适合拉么锌矿选矿厂尾矿处理的方案,即尾矿料浆浓度为70%的膏体尾矿运排方案。该方案具有使生产用水循环利用,尾矿入库干堆排放、外排废水量少等优点,解决了当前拉么锌矿选矿厂尾矿处理面临的问题。

Tailings in dressing plant of Lame Zinc Mine were discharged with low concentration, which caused such prob- lems as high energy consumption,large water-waste, overproof heavy metal and water shortage in production in dry season and so on. Therefore, the current situation of tailing disposals in Lame Zinc Mine was analyzed in detail. Through the analysis of the nature of taitings,the composition and content of tailings were obtained and the tailings are mainly in medium-fine particle. With tailings settling tests, the flocculant dosage by which railings slurry can achieve good settlement effect were measured, and the process and concentrated indicators of paste preparation were prepared. At the same time, through the slump tests and the loop conveyor of high concentrations of tailings slurry, a reasonable transportation plan was finally determined by calculating the concentration,volume and speed of slurry ddivery. A set of the tailings disposal scheme being suitable for dressing plant of Lame Zinc Mine was put forward, that is, tailings slurry with concentration of 70% is considered as paste for transport. The scheme owns a series of advantages, such as water recycling in production, dry tailings stockpiling,less water wastes etc,. So, the scheme can solve the problems of tailing disposal currently faced by Lame Zinc Mine.