The vast Qi wind is green, and the Zizi water is silent.
In October of the golden autumn, a reporter from China Mining News came to the mining area of Shandong Jinding Mining Co., Ltd. and saw the water column of the music fountain dancing like white dragons in front of the exquisite rockery; A three legged golden tripod, symbolizing peace and auspiciousness, stands majestically among the flowers and trees in front of the office building. It is hard to imagine that this is a large mine with an annual output of 2 million tons of iron ore if it is not for the rapidly rotating crown wheel on the derrick under the blue sky.
"Jinding Mining Company is a demonstration unit of green mine construction in Zibo City, and also the third batch of national green mine pilot units. This year, it was officially selected as a national green mine." Zhang Deping, the leader in charge of Zibo Natural Resources Bureau who has been committed to green mine construction, said deeply, "The company has made real efforts in the construction of green mines, explored a development path that is green, high-quality and coordinated with ecological civilization, and provided a good example for the green development of mining enterprises in the city."
1. Practicing the "Two Mountains" Theory and Creating a Green Pattern
Shandong Jinding Mining Co., Ltd. is an iron ore mining enterprise jointly launched by Shandong Jinling Mining Co., Ltd., Zibo Linzi Hongda Mining Co., Ltd. and Shandong Bureau of China Metallurgical Geology Administration in April 2001. The total geological reserves of Wangwangzhuang deposit mined by the company are 58 million tons, the designed annual production capacity is 2 million tons, and the average iron grade of the ore is 51.88%.
The company started construction in July 2002 and formed six systems of air pressure, ventilation, drainage, lifting, power supply and transportation at the end of 2005, which are qualified for ore drawing; In 2015, the production capacity was reached. Now, 6 open shafts, 2 blind shafts, 5 blind inclined shafts, 1474m main belt corridor and 5 stage levels have been formed, and more than 100000 meters of roadways have been developed.
"A new mine must take a new road, adhere to the new development concept, and create a new pattern of green development." At the beginning of the construction of the mine, the company insisted on a high starting point, high standards, starting from the key links such as planning, design, mining, transportation, strictly benchmarking the domestic first-class mines, and strive to build a new modern mine.
Scientifically formulate the implementation plan, define the objectives and measures, and decompose the construction tasks to each functional department and specific personnel.
"Green mines must have big accounts, not only economic accounts, immediate accounts, but also environmental protection accounts, ecological accounts and long-term accounts." Sun Lizuo, general manager of the company, said with foresight, "Green development is the only way for mining enterprises. Although the construction of green mines requires a large amount of investment in real gold and silver, these investment can be transformed into strong productivity and vitality, which can bring broad development space to enterprises. Therefore, we have never spared the investment in green mines, allocated special funds, implemented special account accounting, and ensured the capital investment."
In the process of green mine construction, the company, in combination with its own reality, highlighted the concept of green development and safe development, focused on resource protection, took comprehensive utilization as the key, and advanced technology as the guarantee, made greater efforts in the intensive mining, comprehensive utilization, energy conservation and emission reduction and mine ecological protection of mineral resources, and took multiple measures to comprehensively improve the level of safety, environmental protection and intensive quality and efficiency.
Through continuous construction and continuous improvement in recent years, the company's green mine creation work has achieved remarkable results. In June 2013, it became the third batch of national green mine pilot units. In September 2016, it passed the review and acceptance of the original Shandong Provincial Department of Land and Resources, and was successfully included in the national green mine directory at the beginning of this year. At present, the company has basically formed a green mining pattern of simultaneous promotion of resource exploitation and environmental protection, comprehensive utilization and a virtuous cycle of energy conservation and emission reduction.
2. Implementing Science and Technology to Manage Mines and Improve Comprehensive Efficiency
In 2012, the company took the lead in completing the construction of "six systems" for safety and risk avoidance in iron ore enterprises across the province, and built a remote monitoring system for underground mining based on this platform.
"The system is composed of video monitoring, personnel positioning, electronic weighing, source positioning, etc. Through the system, the mine production information is timely transmitted to the remote monitoring platform of the provincial, municipal and district natural resources management departments, which realizes effective supervision of overlying and cross-border mining, mineral resource measurement, provides a reliable basis for the verification of mine related taxes and fees and dynamic monitoring of reserves, and also lays a foundation for green development and scientific mining underground." Liu Zhongquan, deputy general manager of the company, said.
The company vigorously carries out the scientific and technological construction of strengthening safety, rejuvenating green with the goal of "replacing people by mechanization and reducing people by automation". The safe and reliable multi rope friction hoist is adopted for the underground hoisting system, and the power supply system adopts dual circuit and dual power supply; The underground drainage system adopts sectional relay type automatic drainage; 2m3 electric scraper is used for ore drawing, and 2m3 ore car is hauled by 10T electric locomotive for transportation; After crushing and dry magnetic separation, the mined ore is lifted to the surface ore bin by belt transportation. At the same time, they continued to promote the transformation and upgrading of technical equipment. Drilling jumbo, remote control forklift, one-time blasting well completion, shotcrete anchor mesh combined support and other technical equipment were widely used. The main power distribution room, water pump room, main fan, and underground belt transportation realized unattended and remote surface control. Mobile 4G signals covered all production and operation areas on the ground and underground.
In order to continuously improve the scientific and technological level of the mine, the company also adheres to the road of production, learning and research cooperation, and cooperates with Beijing University of Science and Technology to jointly research and develop a comprehensive technology of safe and efficient mining that conforms to the actual production. Through test comparison and research demonstration, the technology has made important progress in the optimization of multi-level stope layout, the optimization of room structure parameters, the optimization of medium and deep hole blasting parameters, the research of filling material ratio and the properties of filling body. At present, in order to make full use of mineral resources and achieve long-term safety, stable production and high yield, the company is conducting scientific research on the recovery and utilization of reserved pillars. At the same time, we will vigorously promote the application of new technologies and equipment for energy conservation and environmental protection. In addition to the use of advanced energy-saving centrifugal air compressors for air compressors, automatic water replenishment for frequency conversion technology by the production water system, DC speed regulation for elevators, and chopping speed regulation for electric locomotives, we will also rationally adjust the operation modes of the lifting, air supply, and drainage systems, and strictly implement energy conservation and consumption reduction measures such as peak and valley avoidance, load regulation, power saving, and balanced operation, Improve the level of economic operation.
"We also use LED energy-saving lights to illuminate the underground parking lot alleys, surface living areas and office areas, and the main transport roadways realize the intelligent control of the empty line of the motor frame. In recent years, with the increase of mining depth and the increase of power demand, the unit consumption per ton of mine has continued to decrease. In 2019, the total energy consumption was 3557 tons of standard coal, and the unit consumption per ton of mine was 1.78 kilograms of standard coal, a year-on-year decrease of more than 8%." Liu Zhongquan said.
In order to maximize the full development and utilization of resources, the company adheres to the principle of combining development and protection, and strives to achieve the unity of resource benefits, ecological benefits and enterprise benefits. According to the ore body occurrence and mining technical conditions, they mainly adopted the sublevel drilling stage room method for underground mining, followed by full tailings cemented filling after multiple inspections and scientific demonstration. By using this method, the recovery rate of the mine is increased from 78% to 86%, and the goaf is fully filled, which can save 150000 tons of resource reserves annually. At the same time, implement intensive mining, strictly control the tertiary ore volume, reduce the number of production rooms, improve the mining intensity, and reduce the mining ratio. The ore output of large hole ore room has increased from 20000 tons per month to 35000 tons, and that of medium and deep hole ore room has increased from 8000 tons per month to 20000 tons. Remote control scraper shall be popularized and applied underground to clean the dangerous and difficult stope, improve the recovery rate of corner ore body, and increase the output of 10000 to 20000 tons per mine room.
Cemented filling station is built on the surface, with a design annual filling capacity of 900000 cubic meters, an annual waste disposal capacity of 750000 tons, and a filling body strength of more than 3MPa. It is understood that by the end of 2019, 3.3 million cubic meters of glue had been filled and more than 2.4 million tons of tailings had been used.
3. Fulfill Environmental Protection Responsibility and Build Ecological Mining Area
"Our first break is in the underground. The tailings produced after crushing and roughing and the waste rocks produced in the mining process do not come out of the well and are directly used to fill the goaf." Liu Zhongquan said that the company's construction of a cementation filling station on the surface has not only effectively solved the problems of tailings discharge, stockpiling and land occupation of metallurgical and mineral processing enterprises, but also effectively saved the filling cost, protected the ecological environment, and realized economy The organic unity of ecological and social benefits.
This is just a microcosm of the company's ecological mining area. Walking in the courtyard of the company, you can not only appreciate the beautiful "external" environment of green trees, grass, flowers and fountains, but also feel the rich green connotation of the mine from many details. For the domestic sewage that is difficult to use, they will use MBR intelligent buried integrated facilities after centralized treatment to make it meet the Class A discharge standard. After sedimentation, the underground mine water will be recycled for production, living, greening and irrigation instead of being discharged.
As for the details of the production process, the company insists on ecological priority and excellence. They completely closed the tailing belt conveyor gallery of the filling station, and installed dust screens and car washing pools in the tailing yard. All underground rock drilling operations shall be conducted in a wet manner. Complete dust collection, spraying and sprinkling facilities shall be installed at each loading and unloading, transfer and crushing site. Mobile dust-proof pipes and spray dust reduction facilities shall be used for dust removal in each lane, middle section and head-on. The implementation of these measures has created a good working environment for employees and effectively reduced mine dust pollution. In addition, they also used belt transportation to replace shaft and inclined shaft hoisting for underground ore, which realized continuous transportation, effectively reduced the number of underground operators, avoided dust and exhaust emissions caused by automobile transportation, and solved the problems of noise disturbing people and environmental pollution.
"Green is the mainstay, and the golden tripod is as stable as a mountain. Our company has achieved good economic, ecological and social benefits through the construction of green mines. Next, under the leadership of the natural resources department, we should constantly summarize, improve and improve, actively build a long-term mechanism, and strive to raise the level of green mine construction to a new height." Sun Li finally said.
