The new dry tailings discharge process and return on investment analysis [Key words] Dry Fly sieve sieve sand washing sand washing dedicated dewatering screen wash sand iron tailings dewatering screen Sieve dry tailings dewatering discharge sieve sieve sieve dehydration iron mine tailings dewatering Professional tailings sieve sieve sieve quartz sand tailings disposal of tailings dewatering screen a special screening of iron mining industry dry tailings discharge process currently existing problems, many mining industry in the national environmental pressures, the need to dry tailings slurry row processing in response to the national environmental policy, to avoid potential safety problems tailings. And many mining industry mention dry tailings discharge to think the need to invest tens of millions of devices and construction, due to the dry tailings row of large investment, high operating costs, mining industry to make a lot of delays in the implementation process of the dry exhaust. In fact, as long as the understanding of the nature of the tailings, tailings slurry for different size and nature, a reasonable choice of dry exhaust program, you can minimize the investment in equipment, such as the use of dry tailings discharge sieve can reach dry tailings discharge and backwater purpose use. Second, the following is a 3000t / d dry iron tailings three rows of program analysis comparing the advantages and disadvantages: No. contrast traditional program improvement program projects a preferred embodiment of a major equipment concentrated pool filter units + 4 dry tailings discharge sieve 4 + a small concentrated pool filter units + 2 row tailings dry sieve six two fine granularity applicable to more than 50% -200 mesh to 100 mesh crude accounts for more than 50% thicker than 100 mesh accounted for more than 50% after three dry row moisture content 10-22% 10-22% 12-20% 4 power (KW) ≈600 ≈400 ≈90 5 consumable life cloth cloth 1-3 months 1-3 months 6 months or more sieve 7 Investment Amount (million) ≈900 Wan (excluding civil engineering) ≈600 (excluding civil engineering) ≈120 7 production costs (dollars) ≈4.8 / t ≈3.2 / t ≈0.72 / t 8 backwater advantages can be directly utilized. 1, the first dry coarse sieve to remove part of the row, which reduces wear on the follow-up of equipment, and reduce the number of devices and the follow-up model; 2, can directly utilize backwater. A small investment; 2, low operating costs; 3, coarse tailings slurry can be directly used or settlement backwater backwater after use. 9 disadvantages of a one-time investment, electric power, high operating costs; 2, the vulnerability of the short-lived. A one-time investment, electricity power, high operating costs; 2, the vulnerability of the short-lived. 1, for coarse tailings; 2, bottom row after the required flow of dry backwater settlement before use. Third, coarse dry tailings discharge application case and ROI analysis (a) in a case of an iron ore plant in Chengde, is an old-line reconstruction project, 3000t / d of iron ore tailings, 24 hours a day production, tailings concentration of 20%, pulp coarser than 100 mesh size containing about 70%, with a dry exhaust sieve to extract more than 85% of dry ore, tailings discharge after dry moisture <15%, the bottom flowing backwater settlement can use a small part of tailings into the tail Mine library. Dry tailings discharge sieve can save more than 30% of water resources, increase tailings storage capacity more than 30%, and can protect the slurry pump. Backwater return daily processing capacity of tailings (water containing tailings) 15000t / d, dry tailings discharge treated water away 5000 t / d, the remaining 10,000 tons, 50% of the original tailings recycled, according to now recycling 80%, more than 30% recovery, dry tailings discharge of water can be saved: 15000-5000 * (0.8-0.5) = 3000 tons / day, according to the price of water 0.8 yuan / ton, 3000 * 0.8 = 2400 yuan / day, work 300 days a year, 2400 * 300 = 720,000 yuan, 720,000 yuan a year can save water. Return grit dry sand discharge 2550 tons per day, according to 10 yuan per ton profit, working 300 days a year, 2550 * 10 * 300 = 7.65 million yuan, an annual return of 7.65 million yuan grit. The 3000t / d of iron ore tailings using tailings dry sieve row just invested about 120 million yuan. Tail (b) Case II Shangluo a vanadium mines, 500t / d vanadium tailings, a concentration of 25%, particle size coarser than 100 mesh containing about 70%, with a dry sieve row can be extracted ore than 95% dry, dry after row moisture content less than 20% of slag. After the dry tailings discharge tailings for building materials, tailings resource re-use; underflow can directly utilize backwater, completely without tailings. Backwater return daily processing capacity of tailings (water containing tailings) 2000t / d, dry tailings and water drain away processing 900 t / d, the remaining 1100 tons of water, according to water price 0.8 yuan / ton, 1100 * 0.8 = 880 yuan, 300 days a year of work, 880 * 300 = 264,000 yuan, 264,000 yuan a year can save water. Return grit dry sand discharge 475 tons per day, according to 10 yuan per ton profit, working 300 days a year, 475 * 10 * 300 = 1.425 million yuan, an annual return of 1.425 million yuan grit. 500t / d vanadium tailings discharge tailings dry sieve investment of about $ 500,000. Fourth, the conclusion by comparing the above dry discharge plan and ROI analysis can be seen, the use of high GFVD clothes dry tailings discharge sieve advantages: 1, small investment, small footprint, low operating cost, high efficiency; 2, production automatic solid-liquid separation, grit can recycling, re-use liquid backwater, high return on investment; 3, dry tailings discharge sieve running smoothly, free manual operation, long service life of wearing parts, 24-hour continuous operations. Sieve the dry tailings discharge is an alternative mining industry choose low investment, high return new dry tailings discharge devices.