Surface subsidence, environmental pollution, underground resource recovery efficiency is not high, frequent accidents at coal mines and other issues, has been plagued our country's mining industry. Recently, a major technological innovation called “paste-like filling technology†has passed expert appraisal. Experts said that the promotion and application of this new technology with independent intellectual property rights will help solve many problems that plague the mining industry in China. Relevant statistics show that China's land destroyed by mining has reached more than 40,000 square kilometers and is increasing at a rate of 200 square kilometers per year. The total coal pressure is 13.7 billion tons due to fear of surface subsidence. Filling the mined areas caused by mining with filling methods is the main way to solve the collapse. Since the early 60s of last century, cement cemented filling mining of metal mines in rapidly widely used, but because of the inherent drawbacks of cement and high costs, the impact of mining enterprises.
It has been successfully researched by China University of Mining and Technology (Beijing), Tsinghua University, Beijing Lanzi Ningshi Technology Co., Ltd., and has been thoroughly verified by international and domestic large-scale mining companies. Low cost, good fluidity, convenient transportation, high filling strength and environmental protection have become significant advantages of this technology. According to experts, the cost of this technology is only 30% to 40% of the cost of cement cementing. The use of paste-like cement filling technology can also increase the mine recovery rate to over 90%, greatly extending the service life of the mine. In addition, this technology uses industrial waste as the main raw material, which is beneficial to the recycling of waste.
At present, the research group has successfully developed a special preparation, transportation and filling process system, forming a complete set of solutions to solve the filling problem from theory to technology to engineering application.
Precision Casting Of Train Parts
Train parts casting is one branch of carbon steel precision casting, which is widely used in train markets. Precision casting of train parts adopts lost wax casting, also called investment casting. In wax pattern process,we mix stearic acid and paraffin wax.
In wax pattern making, as you know, it is better than polyethylene, and the wax deformation is small. In dipping slurry process,most of the suppliers adopt water glass technics in domestic area,but we adopt compound technics or silica sol technics. As you know, carbon steel castings will be much smoother with compound technics (compound of water glass and silica sol technics),this method is so popular with our customers, and the quality is higher than water glass technics, the cost is lower than silica sol technics.
In shell making,we adopt automatic sand-covering production line, which was invented under the guidance of our general manager.The indoor temperature was controlled by air-conditions,keeping the temperature at 24℃±1℃, which can make the castings much more stable,the internal tissues much more well-proportioned.
Our train parts as precision casting products have quality assurance in accordance with ISO9001: 2008, strict material inspection and exact dimension control, with 100% quality control. OEM order is welcome. The parts can be made completely based on your specifications such as drawing, design, sample etc.
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Wei fang junlong precision casting Co.,Ltd , https://www.junlongcasting.com