** limited liability company located in the delta town of Hulun Buir City, Istanbul, two existing beneficiation plant, daily processing capacity of 900 tons (600 tons +300 tons), lead-zinc ore processing ore, lead and zinc ore grade of 4% Left and right, the ore contains 7% to 8% sulfur, and the ore contains 50 to 60 grams/ton of silver . ** metal mining companies are more mineral species, wherein the main metallic minerals galena, pyrite, sphalerite and arsenopyrite. The main recovered elements are lead, zinc and silver, and the zinc tail is the final tailings. Second, the status quo of the production of the ore dressing plant, the existing problems and the necessity of the transformation 1. Production status 600 tons / day of the ore dressing plant lead, zinc concentrate dewatering using two sections, first concentrated, and then filtered and dewatered. Concentrate of lead concentrate was concentrated using a 9 m central drive concentration cell and then filtered using a 12 m2 cylindrical filter. The zinc concentrate was concentrated using a 9 m central drive concentrating tank and then filtered using a 12 m2 cylindrical filter. Each concentrated filtered water enters the tailings pond. The flotation tailings all enter the tailings pond. The lead and zinc concentrates in the 300 ton/day concentrator are dehydrated in two stages, first concentrated and then filtered and dewatered. The concentrate concentrate was concentrated using a 3.6 m central drive concentrating tank and then filtered using a 3 m2 cylinder filter. The zinc concentrate is concentrated using a 6 m central drive concentrating tank and then filtered using two 3 m2 cylinder filters. Each concentrated filtered water enters the tailings pond. The flotation tailings all enter the tailings pond. 2. Existing problems and the necessity of transformation (1) At present, the dam height of the tailings dam is increasing year by year, which is higher than the road surface height of the original mining area. If it continues to increase, it may cause hidden dangers to the safety of the tailings dam. (2) Through the examination of the concentration of tailings in the plant, the concentration of mine tailings is low, only about 15%, plus the lead-zinc overflow water of the two plants, the concentration of pulp in the tailings dam is very low. Moreover, the sedimentation rate is slower. Eventually, the volume of the tailings dam will drop rapidly. (3) In the past, the ore dressing wastewater of the mine has never been recycled. It is intended to use the overflow water and filtered water dewatered from the tailings to produce zinc-selected brewing water and clean floor water. Partial reuse, that is, reducing wastewater discharge and reducing production costs. Third, the program selection The final option is four: the tailings are filtered and dried. Fourth, the tailings dewatering transformation program combined with the geographical conditions of the mine, the amount of mining, water supply, tailings storage capacity and many other factors, the company determined the annual production of the 300T plant, 600T plant in the winter production organization plan. At the same time, considering the factors of reducing energy consumption, reducing the labor intensity of workers, and improving the working environment, the final scheme of the tailings dewatering project is: using a NT-24 peripheral rack-driven concentrator for a period of concentration, using two HTG-45 meters. 2 The ceramic filter is subjected to two-stage concentration (filtration) to finally produce tailings ore with a moisture content of about 10%, which is then transported by car to the tailings storage. According to the design requirements, the daily processing capacity of the concentrator is 900 tons/day, and the tailings ore amount is 850 tons per day. Selection of thickener (1) Calculate the area of ​​thickener: F=Q/q, Q=850 tons/day, q=1.0～2.0 tons/m2. Day F=425～850 m2 (2) Calculate thickener Diameter: D=1.13√F, D=23.29～32.94米查 “Mineral Design Manualâ€, combined with tailings production capacity of 35.42 tons/hour, and mine production plan and low temperature in winter forest area, so choose one The NT-24 peripheral rack drive concentrator meets production requirements. The choice of filter combines with the production practice of similar mines. More and more mines use advanced ceramic filters instead of filter cloth vacuum filters. Therefore, the company chose ceramic filters for tailings filtration. F=Q/q, Q=850, ton/day, q=3×6×0.6 ton/m 2 F=78.70 m 2 So two HTG-45 m 2 ceramic filters can be used to meet the production requirements. V. Introduction to the tailings dewatering transformation scheme The process is two-stage concentrated filtration. The flotation tailings are concentrated from the flotation plant to the concentration tank for concentration. The bottom of the concentration tank flows from the ceramic filter to the ceramic filter for filtration. The tailings are filtered and transported by car to the old tailings pond. The process is simple and applicable, and no new tailings pond is needed. The tailings dehydration process flow chart combines the special climatic conditions of the forest area. In order to prevent the winter temperature from being too low, the concentrator is normal. The concentration equipment we choose is the NT-24 peripheral rack drive type thickener. This is a relatively mature mineral processing equipment commonly used in domestic mines. The selected ceramic filter is a high-tech product integrating micro-porous ceramics, mechanical, ultrasonic cleaning and automation control. It is a new type of high-efficiency material dewatering equipment . It uses microporous ceramic material as the filter medium. The capillary effect principle is applied. The water can pass through and the ore particles cannot pass through the filter medium. There is no vacuum loss during the whole filtration process, and less energy is needed. The consumption can ensure that the filter is operated under a vacuum, and the filtration efficiency of the device is greatly improved. The utility model effectively solves the defects that the filter device using the filter cloth as the filter medium has low productivity, high filter cake moisture, high energy consumption and high maintenance cost, and the main features are as follows: 1. high vacuum degree and good filter cake drying performance. . 2. The filtrate is clear and transparent, the working environment is clean and pollution-free. 3, using microcomputer control, high degree of automation, continuous operation, less maintenance work, equipment effective utilization rate of up to 95%. 4. Compared with other filtration systems, energy consumption is saved by more than 90%. 5, no need for expensive filter cloth, almost no spare parts consumption, low operating costs. 6. The equipment is compact in structure and low in installation cost. The Jiangsu Yixing Non-Metal Chemical Machinery Factory won the bid of our company's ceramic filter machine is a key high-tech enterprise recognized by the Ministry of Science and Technology. The ceramic filter produced by it has 6, invention patents. Technically reliable. 6. The installed power of the tailings dewatering of the auxiliary project is 80 kW, and the power supply is connected to the power distribution room of the plant. The water supply utilizes the existing water supply system, and the heating is provided by the newly built boiler, and the drainage is discharged directly into the tailings storage. Machines, electricity, repairs, etc. are maintained by existing plant selection machines, electricity, repairs, and tailings transportation is shipped from the company's fleet to the tailings storage. VII. Occupational Safety, Health and Environmental Protection Our mine already has more mature mining and selection technology in China. The existing industrial site, water and electricity construction conditions can meet the requirements of technical reform. Therefore, the scope of occupational hazards has not been expanded. The nitric acid used in the ceramic filter cleaning filter plate in the newly-built tailings dewatering project can provide pre-employment training for workers in the production process, provide necessary labor protection measures, and can be controlled during the production process. This transformation has no damage to the current environment, and can alleviate the potential damage to the surrounding environment of the existing tailings pond and extend its service life. It is a concrete embodiment of implementing the sustainable development strategy. VIII. Technical and economic analysis 1. The labor system for labor quotas is: 330 days, 3 shifts and 8 hours work system. In the plant selection, a new tailings dewatering section was added, with 6 new dehydration operators, 1 boiler worker, and a wage of 9,000 yuan per person per year. 2. The total investment of the project and the total investment of the fund raising project is 4.106 million yuan, all of which are self-raised by the enterprise. IX. Conclusion Based on the needs of sustainable development of mines, our company looks to the future. According to the actual situation of our company's ore dressing production, we use advanced production technology and equipment to dewater the tailings and dry them in the existing tailings dam. Forest environment. While realizing the company's economic benefits, and harmonious development with the forest area, it will certainly achieve good social benefits. Die Cast Aluminium,Led Lamp Housing Parts,Aluminium Die Casting Parts, Led Light Cover Parts Ningbo Best Channel Import & Export Co., Ltd. , https://www.nbbtc-metal.com
Feasibility Study on Dehydration of Lead-zinc Mine Tailings