Cutting diamond granite with diamond bead wire saw
August 17, 2018
It is well known that the use of diamond bead wire saws for marble cutting in marble mining is a very mature technology. However, after Italy Ma Ruini (MARINI) the company's engineering and technical staff years of unremitting efforts, the application of diamond Wire Saw cutting granite in granite mining process has become a reality. China's traditional granite mining process is a combination of vertical flame cutting and horizontal blasting, resulting in a great waste of resources. This paper will compare the production cost and technology by using diamond bead wire saw cutting granite and traditional flame cutting method. It is concluded that the application of diamond bead wire saw cutting granite to protect resources and environmental protection mining will be China's granite. The conclusion of a new technological revolution in mining.
First, the production cost analysis comparison:
For example, a section with a height of 10 meters and a length of 12 meters: 120 square meters is used. 1. Diamond bead wire saw is used to cut granite cross section diamond bead rope. Price: imported rope is about 140 US dollars/meter, domestic rope is about 600-700 yuan. RMB/m, with an average service life of 8 square meters per meter of rope. According to calculations, the average production cost is: US$17.5/m2 for imported ropes and 75-87.5 RMB/m2 for domestic ropes. The cutting speed is 2-4 square meters per hour. The production cost of cutting a 120 square meter section: $2,100 for imported ropes and 9,000-10,500 yuan for domestic ropes. The cutting seam is only 1.1 cm and there is almost no waste. The new generation of energy-saving "Super Big Fly" diamond bead wire saw developed by Marini has a total power of only 25 kW.
2. Using flame cutting machine to cut granite section flame cutting machine diesel consumption 40-50 liters of diesel / hour, domestic price per liter of diesel is 2.85 yuan, cutting speed is 1 square meter / hour. According to calculation, the average production cost is 114-142.5 yuan / square meter. Production cost of cutting 120 square meters section: 13,680-17,100 yuan. Moreover, the cutting waste width is 25-30 cm, and the section cutting 120 square meters wastes 30-36 cubic meters of stone.
Second, technical characteristics analysis and comparison:
1. The working principle of cutting the granite section with diamond bead wire saw is to directly cut the granite (physical method) by the cyclic rotation of the diamond bead rope driven by the motor, and fill the saw with sufficient water while sawing. It acts to cool diamond beads and eliminate sawing rock powder. Cutting speed is 2-4 square meters per hour. The cutting depth can be 10-20 meters or even deeper, and the cutting section can be at a right angle of 90 degrees. Cutting method: vertical direction, horizontal direction, 90 degree direction, "blind cutting" mode. Reduce waste of resources, only a 1.1 cm kerf. It has no noise, no dust, safe and reliable operation, high output, high level of material without regular damage, high market price and high price. Suitable for all granite mines.
2. The working principle of cutting the granite section by flame cutting machine is to use the high-temperature high-speed flame flow (temperature 1500 °, speed 1340 m / s) to impact the quartz in the granite, with the different thermal expansion coefficients of different minerals in the rock. The rock is suddenly broken, peeled off, and the cuttings are blown away by high-speed air to cut granite. The cutting speed is about 1 square meter per hour. The cutting depth is limited to only 4-6 meters, and the cutting section cannot form a 90 degree right angle, leaving a semicircular dead angle of 1-2 meters. Cutting method: generally only in the vertical direction, used to cut the sulcus (groove) to create a free surface. The waste of resources is large, and about 25-30 cm of stone is wasted. It has a huge noise (120-130 decibels), large dust, high operational risk, low output, low block material, low internal rate and low market price. It is only suitable for granite mines with high quartz content and few cracks, so it has certain limitations. In summary, starting from the viewpoint of protecting resources and environmentally friendly mining and the results of technical and economic analysis and comparison, it is imperative to use diamond bead wire saw to cut granite to mine granite mines in China. Marini has established three model mines in the province of Heilongjiang Province and Fujian Province that use energy-saving "super big fly" diamond bead wire saw to cut granite mine. After more than three years of practice, it has reached perfection.
