Zhejiang Suichang gold mine is a Jicai, elections, smelting as one daily processing 300 tons of ore provincial state-owned gold mining enterprises. In recent years, Suichang gold always adhere to green development pointer 'ecological mine ", adhere to green development" Guanghui is the Jinshan Silver Mountain ", adhere to the" protection of the development, protection in the development of "green development The principle is to actively develop a circular economy and embark on a path of sustainable development.
Comprehensive Governance and Resolving Historical Legacy According to "Zhejiang Tongzhi", "Re-establishing Zhejiang Tongzhi Manuscript", "Suichang County" and other documents, the Zhilingtou Mining Area in Suichang County has been mining activities since the early Tang Dynasty to the Republic of China. 50-70 years of the last century, in this Longyou pyrite mining pyrite. Late "Cultural Revolution", Suichang County Office of sulfuric acid phosphate fertilizer plant and the local commune Lian Lian bamboo bamboo gold are pyrite and gold mining in the region. Numerous tunnels and nearly one million square waste rock slag formed by successive mining have spread over the southern and northern slopes of the mining area. The acid waste water from the acid heavy metal wastewater and the sulfur-containing waste rock slag field through rainwater dripping, oxidation, leaching and hydrolysis directly flows into the downstream water body. The valleys along the way are all yellow, and the fish and shrimp are extinct.
In order to control the historical pollution, the mine has carried out environmental treatment demonstration projects and ecological restoration demonstration projects in recent years, mainly including acid waste residue treatment and acid heavy metal sewage treatment. In the process of waste rock treatment, a total of more than 1.9 million tons of waste rock was covered, covering an area of ​​22,000 square meters. During the construction process, the tailings slurry is poured, the slag is neutralized to block the pores of the waste rock, and the mixture of the calcium carbide slag and the tailings is used to cover the yard to form a protective layer, and then the vegetation is covered, thereby achieving the purpose of separating the waste rock from the air and water. Significantly reduce the amount of waste rock acid drainage and reduce the concentration of heavy metals in the filtrate.
In order to completely solve the problem of acid sewage, closed measures were taken through the underground mine pyrite mine goaf area to cover the surface waste rock pile with calcium carbide slag, and a geological environment treatment project system solution such as clearing and diversion is implemented, which greatly reduces the generation of wastewater. The acidic wastewater enters the sewage interception reservoir, and is treated comprehensively by using calcium carbide slag, and then enters the tailings pond for further neutralization, precipitation, degradation, and discharge to the standard. After the implementation of the neutralization slag filter press project, the neutralized wastewater is subjected to pressure filtration treatment, and the filtrate is clarified and then enters the tailings pond. The standard rate of total discharge of gold mines increased by 5%.
Clean production and beautification of mining environment In order to achieve the "three simultaneous" environmental protection facilities and the main project, the Suichang Gold Mine invested more than 1 million yuan in the construction of cyanide-containing sewage treatment facilities. After continuous exploration and testing, the treatment process has been improved several times, and the qualified rate of cyanide-containing wastewater discharge has been stable at 100%. August 2003 after all slime cyanidation process of technological transformation, to achieve the process waste water recycling, waste water containing cyanide and lead concentrate zinc mineral water every day almost zero emissions.
In production, the Suichang Gold Mine has been continuously optimized, and new waste slag stacking is expected to achieve zero land occupation. At present, the waste rock produced every year is in short supply, and the original waste rock stock is still decreasing. It is expected that no new land will be occupied in the future. At the same time, the amount of mining in other surrounding stone mines has been reduced, and the ecological environment and ecological landscape have been effectively protected.
A mine is like a "small society." While actively controlling pollution and restoring the ecological environment, the Suichang Gold Mine has actively landscaped the mining environment and invested more than 3 million yuan to rationally plan the greening of the mining area and select suitable flowers and plants for planting. Nowadays, the greening layout of the entire mining area is reasonable, and the greening rate of the green area is over 99.9%. The roads in the mining area are clean and tidy, the environment is beautiful, and the birds are fragrant.
Going out of the mining area and seeking diversified development "One flower is not spring, and the flowers bloom in spring." At the end of the last century, the gold miners who experienced a mineral resource crisis deeply realized that if they only rely on the existing mineral resources of Garden Ridge, Changjin Mine can not only continue to grow and develop, but will gradually decline toward depression. Therefore, with the spirit of “exploitation and innovationâ€, the Suichang Gold Mine has embarked on a path of diversified development while exploring the side.
In the early 1990s, the gold miners who dared to challenge had explored in mining development, thermal power investment, building materials, fishing rods, gray sand bricks, etc., but due to the small scale of early investment projects, single products and specifications, lack of competitive advantage. The lack of management and other reasons have not achieved the purpose of investment and development. In the new century, the development of the Suichang Gold Mine has gradually shifted to familiar areas such as mining, mining, gold and silver processing, and there are advances and retreats.
Explore the development of commercial housing and standard factory buildings, obtain the fourth-class qualification for real estate development, develop commercial housing and standard workshops of more than 80,000 square meters; develop industrial tourism, develop limited mineral resources into unlimited tourism resources; from pure gold The production progresses to the deep processing of gold and silver, adopts advanced production technology and scientific testing methods, and develops products such as potassium cyanide, gold and silver jewelry, gold foil wine, etc. The produced potassium cyanide is used as a gold-plated raw material for the Shenzhou spacecraft. On the separate connector of the arrow ship, it has become the largest-scale cyanide-potassium-potassium production enterprise in Jiangsu and Zhejiang provinces; built two modern silica sol investment casting process and water glass casting process line to form a high-quality full-silica sol process with an annual output of 1,000 tons. The production capacity of precision castings and precision castings of 6000 tons of water glass technology, the casting products produced by Tiananmen Square, the Great Hall of the People, etc. are used as guardrail bases, and become the leading enterprise in Zhejiang Province to produce high-grade castings by using “precast cast iron technologyâ€. Focus on and track continuous fiber thermoplastic composite projects, independently developed "continuous fibers and resins The special mold for synthesis has won the national “utility model patent†certificate, and the products are favored by foreign customers.
Transformation and upgrading of industrial tourism As early as 2003, the Suichang Gold Mine opened up an abandoned tunnel and part of the slag yard and abandoned plant area as a pilot. After environmental remediation and scenic spot construction, a science education base was built to show some mining sites in the Southern Song Dynasty. . By 2005, the Suichang Gold Mine had obtained the first batch of “National Mine Park†construction qualifications in Zhejiang Province, and developed limited mineral resources into unlimited tourism resources, which will be the millennium mining civilization, mining and relics and ecology of the mine. The resources are integrated, and high standards are developed to create a mining mountainous area with the theme of “Exploring the Millennium Golden Cave Puzzle, Round the Past and Present Golden Dreamâ€.
In December 2007, after the acceptance of the Ministry of Land and Resources, the National Mine Park of Suichang Gold Mine was officially opened, and the organic integration of rich mining relics, unique ancient celebrity effects and good mine ecological environment was formed. A three-dimensional landscape loop line, with line points, constitutes the layout of the "one line, two belts, four areas".
In just a few years, the Suichang Gold Mine National Mine Park has become the first national mine park in China to build an AAAA-class tourist attraction and the only tourist attraction in the country named “China Gold Journeyâ€. Now it has become a national mine. A model of tourism and a new tourist hotspot in the Yangtze River Delta region. At the same time, the scenic spot also absorbed more than 30 mining workers and more than 120 local farmers, and significantly promoted the development of surrounding tourism and related industries, and achieved good economic, environmental and social benefits.
Today, the National Mine Park of the Suichang Gold Mine has become the “National Land and Resources Science Base†and has become a “golden mine†that has been dug up. The number of tourists and the operational indicators of the mine park has also increased rapidly. In 2016, a total of 247,000 tourists were received. , to achieve operating income of more than 41 million yuan.
Through the construction of the National Mine Park, the Suichang Gold Mine effectively utilizes and protects the historic and unique mining relics on the one hand, enabling the sustainable use of mining heritage resources; on the other hand, the mine resource crisis is alleviated and can be sustained in the long term. Management, mining relics will become the replacement resources after the closure of the Suichang Gold Mine.
The practice of developing green mining in the Suichang Gold Mine not only drastically reduced the discharge of acid sewage, but also completely improved the emission targets, eliminating the pollution threat to the downstream 18,000 mu of farmland and the Songyin River and the Lancang River. At the same time, the development of industrial tourism is also the mining area. Providing a new economic growth point, the main environmental problems in the mining area will be solved, and the ecologicalization of the mine closed pit will be finally realized, and a sustainable development path of mine development and environmental protection will be achieved.
A Beam Expander is any optical system designed to increase the diameter of a Laser beam. In most cases, the term is taken to mean a telescope designed to take a small-diameter collimated beam input beam and produce a larger diameter collimated output beam, thus reducing the divergence of the beam. The beam expander consists of a negative input lens and a positive objective. The expansion factor is the ratio of the focal length of the two lenses.
Beam Expander
Beam Expander,Laser Beam Expander,Beam Expansion,Variable Beam Expander
Changchun New Industries Optoelectronics Technology Co., Ltd. , https://www.lasersciences.com