Recently, the Ministry of Environmental Protection prepared "emission permit applications and technical specifications issued by the non-ferrous metal industry (draft)", the standard "draft" encompasses mercury, cobalt, aluminum, magnesium, nickel, titanium, antimony, copper , tin, lead, zinc 11 kinds of commonly used non-ferrous metal smelting industry technical specifications, each booklet (which is a lead-zinc, total 10). According to national economic statistics, China's non-ferrous metals industry involves a total of 64 kinds of metals, including heavy metals, light metals, precious metals, semi-metals and rare metals. Up to now, China has issued 11 pollutant discharge standards for the non-ferrous metals industry, including 9 industrial pollutant discharge standards and 2 comprehensive atmospheric and water discharge standards. Production status of China's non-ferrous metal smelting industry Non-ferrous metals refer to 64 metals other than ferrous metals (alloys of iron , manganese , chromium and iron). At present, China's industrial production mainly includes lead, zinc, copper, aluminum, tin, antimony, mercury, magnesium, titanium, nickel, cobalt and the like. According to the China Nonferrous Metals Industry Association Industry Statistical Yearbook, in 2016, nonferrous metal production accounted for more than 95% of the total industry output, of which aluminum production, copper production and lead production accounted for 74%, 11% and 7% of the total industry output respectively. From 2010 to 2014, the total output of China's top ten non-ferrous metals increased year by year, reaching 18.71 million tons in 2014, of which the total output of copper, aluminum, lead and zinc accounted for 96.07%. In 2016, there were 1156 non-ferrous metal smelting enterprises, including 733 certificates issued in 2017 (218 copper, 365 lead and zinc, and 150 electrolytic aluminum), mainly distributed in Hunan, Guangdong, Henan, Shandong, Yunnan, Shaanxi, Shanxi, Ningxia, Guizhou, Inner Mongolia and other regions. Status of pollutant discharge in non-ferrous metal smelting industry The non-ferrous metals industry is complex, with many processes and a large amount of pollution factors. In recent years, the discharge of non-ferrous metal unit products has shown a downward trend, but the production of heavy non-ferrous metals has increased rapidly, and the total amount of pollutants is still large. The discharge of heavy metal pollutants in the non-ferrous metals industry is mainly concentrated in the process of smelting copper, lead and zinc. According to statistics, in 2012, the production of SO2 in the main heavy non-ferrous metals (copper, lead and zinc) production process was 400,000 tons; heavy metals (lead) , cadmium , arsenic , mercury) emissions of 974 tons. In terms of heavy metal pollution types, lead emissions are 680 tons, cadmium emissions are 57 tons, arsenic emissions are 232 tons, and mercury emissions are 4 tons. From the perspective of metal varieties, copper smelting heavy metal emissions of 412 tons, lead smelting heavy metal emissions of 566 tons, zinc smelting heavy metal emissions of 89 tons. In recent years, the pollution problems involving heavy metals caused by the accumulation of long-term emissions have begun to emerge. Major pollution incidents at the basin and regional levels of heavy metals have occurred from time to time, posing a serious threat to China’s socio-economic sustainable development and people’s health. The safety of China's ecosystem is also a major hidden danger and unsafe factor. In 2016, the non-ferrous metal smelting and rolling processing industry accounted for more than 50% of the heavy metal emissions, and the air pollutant emissions accounted for more than 95%. According to statistics, in the past ten years, the non-ferrous metal industry's four pollutant discharges and smoke dust emissions and the contribution of various pollutants industries have shown an upward trend. In 2013, the SO2 and NOx emissions industries in the non-ferrous metals industry contributed about 7%. Heavy metal pollution emissions account for between 30% and 90%, of which cadmium contribution accounts for up to 90%. Current Status of Air Pollutant Treatment in Copper Smelting Industry Among them, the pollutant discharge of copper smelting enterprises implements the “Emission Standards for Copper, Cobalt and Nickel Industrial Pollutants†(GB25467), and the “Guidelines for Feasible Technical Control of Copper Smelting Pollutants (Trial)†is the implementation of pollution control technology in the production process of copper smelting industry in China. An important basis. Organizational governance status and trends "Guidelines for Feasible Technical Control of Copper Smelting Pollution Prevention (Trial)" "Guidelines for Feasible Chemical Control of Nickel Smelting Pollution (Trial)" and "Guide to Feasible Technical Guidelines for Pollution Prevention and Control of Cobalt Smelting (Trial)" (Ministry of Environmental Protection Announcement No. 24, 2015), The important basis for the implementation of pollution control technology in the production process of copper-nickel-cobalt smelting industry in China. Among them, the cobalt smelting process currently has no fire process, and all adopt the wet process. Therefore, the cobalt smelting production process generally does not emit pollutants such as particulate matter, sulfur dioxide and nitrogen oxides, and is generally derived from boiler emissions. At present, the particle treatment technology of copper and nickel smelting process mainly includes electric dust collection technology, bag type dust collection technology and cyclone dust collection technology. Among them, the electric dust collection technology is mainly used in the copper and nickel smelting plant for dust collection in the smelting furnace, dust collection in the blowing furnace, dust collection in the depleted electric furnace, and dust collection in the dry flue gas. The bag type dust collection technology is suitable for the purification of concentrate in copper and nickel smelting enterprises, dust collection in copper smelting anode furnace and dusty exhaust gas in sanitary ventilation system. Cyclone dust collectors can only be used as primary dust collection to reduce the load on subsequent dust collection equipment. The copper-nickel smelting enterprises generally use sulfur desulfurization, lime/ limestone - gypsum desulfurization, sodium-alkali desulfurization, metal oxide absorption desulfurization, organic solution circulation absorption desulfurization and active coke adsorption desulfurization to ensure Discharge. Among them, the ammonia desulfurization technology is suitable for the desulfurization of low-concentration SO2 flue gas, and is especially suitable for smelting enterprises with sufficient supply of liquid ammonia and certain by-products. The lime/limestone-gypsum desulfurization technology has strong adaptability. While satisfying the low concentration SO2 treatment of copper smelting enterprises, it can also partially remove SO3, heavy metal ions, fluoride ions, chloride ions, etc. in the flue gas, but it is not suitable for desulfurization. A smelting enterprise with a shortage of agent resources and limited space. The metal oxide absorption desulfurization technology is suitable for smelter flue gas desulfurization with metal oxides readily available or metal oxides as by-products. The organic solution circulation absorption desulfurization is suitable for the smelting enterprises where the low-pressure steam in the plant is easy to obtain, the concentration of the flue gas SO2 is high, the fluctuation is large, and the by-product SO2 can be recycled. The active coke adsorption desulfurization is suitable for smelting enterprises where the steam supply in the plant is sufficient, the site is abundant, and the by-product SO2 can be recycled. In addition, most enterprises in the copper-nickel smelting industry do not exceed the standard of nitrogen oxides, and some enterprises that cannot achieve stable standards can adopt the ammonia denitration technology to meet the emission standard limit requirements. The non-organized discharge nodes of copper-nickel-cobalt smelting enterprises mainly include dust generated by raw materials loading, unloading, preparation, transportation, drying, feeding, etc., and various types of kiln feed inlets, discharge ports, slag discharge ports, chutes, etc. In the electrolysis workshop tanks, soaking acid mist and so on. Therefore, the unorganized emission control measures of copper-nickel-cobalt smelting enterprises mainly include the following three points: First, the road surface of the main transportation roads in the plant area shall be hardened, and the transportation routes shall be sprinkled with water to reduce dust and dust, so as to reduce dust pollution. Second, the storage and transportation of raw and auxiliary materials should be closed, and a gas collection and dust collection facility should be set up. Gas collection and dust collection facilities shall be provided at the feeding and blanking points during the preparation and transportation. Third, smelting furnaces, converting furnaces, refining furnaces, furnaces, kiln inlets, and chutes should be equipped with gas collection and desulfurization facilities. Wet facilities such as leaching tanks and septic tanks should be equipped with gas collection facilities and sent to the acid mist purification facility for treatment. Neodymium Retrieval Magnet,Retrieval Magnet For Fishing,Magnetic Net Release,Magnetic Fishing Net Release Ningbo Besten Magnet Co., Ltd. , https://www.bestenmagnets.com