In Ruyang, western Henan, there is a super-large molybdenum mine that has been sleeping for 0.12 billion years-the Donggou molybdenum mine of the Gold and Molybdenum Group. In 2005, the Chinese Enfei people came here and built a modern large-scale mine in 10 years.
In 2015, the Donggou molybdenum mine project designed by China Enfei was officially put into operation. The production process is stable, the product quality is reliable, the energy consumption and material consumption are lower than the design value, and the overall technology has reached the international advanced level. In 2017, Donggou Molybdenum Mine passed the on-site inspection and professional evaluation of national green mines, and became a large-scale, high-efficiency, low-consumption and environmentally friendly green intelligent mine model in the industry.
Donggou Molybdenum Mine is another major project that China Enfei and Jinduicheng Molybdenum Group have worked together for 60 years. In the past, Enfei people provided full life cycle services for Jinduicheng molybdenum mine through high-quality service and superb technology, making the "molybdenum capital" of the motherland shine. Today, the successful construction of Donggou molybdenum mine has laid an important foundation for Jinmo Group to maintain its leading position in the industry and lead the development of molybdenum industry in the world, and set a new model for the high-tech and high-quality development of the industry.
Crafted Cast Boutique
Ten years to sharpen a sword. From 2005 to 2015, China Enfei participated in the whole cycle and process from project initiation, site scheme selection, resource development and utilization and inspection and demonstration of various process schemes to project development of preliminary design, construction drawing design and construction implementation. It is precisely because they are familiar with every detail that Enfei can carve out a high-quality project in the Donggou molybdenum mine industry with the spirit of meticulous craftsmanship.
The design scale of Donggou molybdenum mining project is 20000 tons/day, and the final product scheme is molybdenum concentrate and iron concentrate.
In terms of mining technology, according to the overall resource situation of Donggou molybdenum mine, China Enfei finally determined the principle of open-pit phased mining through systematic research and analysis, and gradually implemented mining and resource recovery. Liu Yuming, deputy chief engineer of Enfei, China, said that phased mining can better combine the deposit conditions and site topography as well as the use of dump, which can greatly reduce the initial investment.
Through a large number of scheme comparison and selection work in this project, it is finally determined that the ore will be transported by automobile with semi-mobile crushing belt. This method greatly shortens the process, reduces the distance of automobile transportation, reduces operating costs, and improves labor efficiency; at the same time, it realizes the independence of the concentrator and the mining field, and the two sides do not interfere with each other, effectively improving the operating environment.
In terms of crushing and grinding process, through a large number of preliminary experimental studies and scheme comparison and selection work, they finally chose the SABC process of "semi-self-grinding ball grinding and crushing of stubborn stones", which has simple process, convenient operation and strong adaptability to ore. The semi-autogenous mill they selected adopts a "double-drive frequency conversion" adjustment device, which ensures the adaptability of SABC process to ore fluctuations, and can adjust the speed in real time according to the ore supply, so as to save energy and reduce consumption to the greatest extent.
According to the multi-element analysis of the geological report, the main minerals that can be recovered in this project are sulfide and magnetite. For these two minerals, China Enfei design team has carried out detailed small-scale experimental research and semi-industrial experimental research, and combined with the company's years of practical experience in the production of molybdenum sulfide and magnetite, has determined the advanced separation process and suitable equipment: molybdenum recovery adopts the process of "rough grinding and rough separation, rough concentrate three times and then five times of selection"; Iron recovery adopts "rough separation of molybdenum tailings, rough concentrate two re-grinding multiple selection" process. In terms of equipment selection, SMD is used as the 2. three-stage scrubbing and regrinding equipment. VTM300 vertical mill with high efficiency and energy saving is selected as regrinding equipment for molybdenum recovery. Iron recovery adopts the combined equipment of bare magnetic machine ball mill regrinding magnetic separator column magnetic separator to realize coarse selection and discard a large amount of gangue minerals and reduce the amount of iron regrinding.
With the adoption of advanced technology and equipment, the project finally achieved a molybdenum concentrate grade of 57%, a recovery rate of 87.5, a magnetic iron grade of 64%, and a magnetic iron recovery rate of 76%, reaching the industry-leading level.
Green intelligent new benchmark
Nowadays, the global mining industry is undergoing a new revolution, the mine production mode is constantly updated, the mining industry is developing in the direction of scale, intensification and coordination, and the mining engineering is entering the stage of remote control, intelligence and even unmanned. In terms of building smart mines, Donggou Molybdenum Mine has achieved overall informatization and networking. Through the information monitoring system, real-time monitoring of all production and living facilities including Shizhugou Reservoir, mining site, dump, concentrator, office building, and dormitory is carried out.
"DCS automatic control system has high reliability and strong functions, realizes the integration of mine operation control and enterprise management, and can effectively guarantee the efficient, low consumption, safe and reliable operation of large-scale equipment." Liu Yuming introduced.
It is understood that the project also uses internationally advanced instruments with high reliability. The particle size analyzer, pulp metal grade analyzer, and foam imaging analyzer all use internationally advanced equipment to provide data guarantee for the automatic control of the entire concentrator. At the same time, actively promote the application of computer simulation technology, intelligent expert control.
Green development, concept first. At the beginning of the project, China Enfei and the owner jointly clarified the development goals of the project. The seemingly abstract vocabulary of "high starting point, high level, high standard, high investment, high efficiency, and low cost" slowly accompanied the advancement of the project. Become a reality.
The overall layout of Donggou Molybdenum Mine is reasonable and the process is smooth. The mine water supply reservoir is located in the upper reaches of the river in the mining area, which meets the self-flow of water supply and reduces the cost of water delivery. The ore from the mining area and the concentrator is connected by the tunnel belt conveyor, which can reduce the operating cost and realize the independent separation of the site and reduce mutual interference; the site of Quanshuangou tailings pond is located in the downstream direction of the river, and the site elevation is relatively low, which reduces the height difference of tailings transportation and saves the transportation cost; the concentrator makes full use of the terrain to form different steps to realize the artesian flow of main ore slurry and the artesian flow of chemical addition; the tailings slurry transportation pipeline makes full use of the terrain and is arranged along the diagonal river, which reduces the land acquisition area and line fluctuation, which is convenient for future production, maintenance and management.
The calculation of the main indicators of green mines shows that the green coverage rate of the mining area is 100, the land reclamation rate of the mining area is 90, the mining recovery rate of mineral resources is 96.07, the recovery rate of mineral processing is 87.94, the comprehensive utilization rate of resources is 70.58, and the utilization rate of wastewater is 100. With many achievements and significant development advantages of ecological intelligent mine, Donggou molybdenum mine has successfully passed the field verification and professional evaluation of national green mine. Today, the classic projects that have attracted the attention of this industry are proud of the "multiple identities" of safe mines, quality mines, lean mines, humanistic mines, and sustainable mines.
The mission is to shoulder bravely
As a central enterprise, while continuously improving efficiency, China Enfei adheres to the values of sustainable development, with the goal of building intelligent and ecological mines, promoting a virtuous circle of industry economic development and green development, leading the industry to take the green development path of "efficient, clean, low-carbon and circular", earnestly practice social responsibility and highlight the responsibility of the industry national team.
Donggou molybdenum mine is the largest molybdenum mine in Ruyang County. The implementation of this project integrates some small mines such as the former Caogou molybdenum mine, which has played an exemplary role in the development of the local mining industry. After the project is completed and put into production, it has made outstanding contributions to local economic development and contributed to poverty alleviation and prosperity in Ruyang poor counties. In this process, the company actively and properly handled the relocation problem, and built high-standard concentrated residential areas and supporting community facilities for Donggou Village, Mamiao Village, and Batioping Village, and the living conditions of the villagers were significantly improved; the implementation of the project provided jobs. About 400 people have solved the employment problem of some local farmers and increased the per capita income level.
Today, the project has become a new modern enterprise with large-scale, high efficiency, low energy consumption and less pollution, and has become a model for local mining enterprises, promoting the innovation and development of local mining industry.
On the road of innovative technology, Enfi people never stop. With the responsibility of the "national team", they went deep into the front line and cooperated sincerely, constantly explored the advanced nature and rationality of industrial design, and interpreted the mission of the "national team" with their own practice. In the future, they will continue to give full play to the advantages of "non-ferrous mining and metallurgy national team, green environmental protection vanguard, and emerging industry innovators", adhere to the road of high-quality development, and make greater contributions to industry progress and industrial upgrading.
