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Media / Application stories / Atlas Copco’s Tricone Bit Won Customers’ Satisfaction with Excellent Performance

Atlas Copco’s Tricone Bit Won Customers’ Satisfaction with Excellent Performance

2013-10-28

Nanfen open-pit mine introduced a unit of Atlas Copco PV351 drill rig in 2010 configured with Atlas Copco 12 1/4” F7 blasthole tricone bit so as to improve efficiency and mechanization degree and reduce cost.

PV351

Atlas Copco PV351 drill rig


Nanfen Open-pit Mine is one of the large-scale ferrous metallurgy mines in China and also one of the major production bases of Benxi steel iron ore. The mine is located in Nanfen District of Benxi city with a length of 5.5 km from south to north, a width of 0.4-1 km from east to west, the area of 4.6 km2 and the total coverage area of 13.15 km2. Nanfen Open-pit Mine is consisted of green mudstone, quartzite and red ore with a mean hardness of F=18, belonging to Anshan type sedimento-metamorphic iron deposit of presinian period. Opencast working mode is mainly adopted due to its simple structure and depth between deposit and earth surface.

At present, Nanfen Open-pit Mine has become one of the monomer mines with the highest annual output. Its  content of iron ore reaches up to 30%, annual stripping amount totals 100 million tons and annual ore output is 16 million tons. In addition, Nanfen Open-pit Mine introduced a unit of Atlas Copco PV351 drill rig in 2010 configured with Atlas Copco 12 1/4” F7 blasthole  tricone bit so as to improve efficiency and mechanization degree and reduce cost.

Difficult to Exploit

At present, Nanfen Open-pit Mine blasts three times per week, with blast size of 250,000 tons each time, hole spacing and row spacing of 7m and 8m respectively, hole diameter of 310mm, mean hole depth of 21m, ultra depth of 0.5m, step height of 12m and 18m, berm width of more than 50m, and road grade of 25 degree.  In addition to one Atlas Copco PV351 drill rig, the mine also has 11units of domestic rotary drill rigs.

It’s reported that Benxi city has a relatively big annual temperature difference with the maximum temperature of 40℃ and the minimum temperature of -40℃, more rain in summer, mean annual precipitation of 800-900mm and altitude of 350m. Besides, drilling tools are easy to be abrased and eroded due to its hardness of rock and moisture content in stratum, causing the early degradation or abandonment of drilling tools and bringing the mine a double loss both on economy and production efficiency.

High Penetration Rate

Atlas Copco China - tricone

Atlas Copco 12 1/4” F7 blasthole roller bit


In order to solve the quick abrasion problem of drilling tools, Nanfen Open-pit Mine specially bought a batch of Atlas Copco 12 1/4” F7 blasthole roller tricone bits and compared them with the former tricone bits of other brand; the results show Atlas Copco 12 1/4” F7 blasthole tricone bits have a faster penetration rate, longer service life and can efficiently reduce times of bit change, increase life of stabilizer and reduce workers’ labour intensity.

Under the same condition that Atlas Copco PV351 drill rig is used, rated flow and rated pressure of air compressor are 3800 c.f. per minute and 110 pounds per square inch respectively, feed pressure is 150 bar and rotary speed is 90 rpm, the average   penetration rate and average service life of Atlas Copco 12 1/4” F7 blasthole tricone bits and domestic tricone bits of other brands are shown as follows:

Comparison of penetration rate and service life

Open table
BrandAtlas CopcoOther brands
Average hole depth (unit:m)2121
Average drilling time per hole (unit: minute)5580
Average penetration rate (m/min)0.380.26
Average service life (m)1150380
Thus it can be seen, under the same drilling condition, average penetration rate and average service life of  Atlas Copco 12 1/4” F7  tricone bits are 46% and 203% higher than those of former bits used by Nanfen Open-pit Mine.

According to Yan Xiaokun, Commander of Atlas Copco PV351 drill rig, “we have never used such a good tricone bit like this before. Though its price is a little higher than other bands, considering the high production efficiency and good cost performance, we still choose Atlas Copco.”

For further information please contact:

  • Caroline He
    Senior Marketing Communication Specialist, Atlas Copco Mining and Rock
    Excavation Technique
    Phone: +86 10 5870 6331
    e-mail: caroline.he@cn.atlascopco.com
Atlas Copco’s Mining and Rock Excavation Technique business area provides equipment for drilling and rock excavation, a complete range of related consumables and service through a global network. The business area innovates for sustainable productivity in surface and underground mining, infrastructure, civil works, well drilling and geotechnical applications. Principal product development and manufacturing units are located in Sweden, the United States, Canada, China and India.

Rock Drilling Tools is a division within Atlas Copco’s Mining and Rock Excavation Technique business area. It develops, manufactures and markets rock drilling tools worldwide. Its products are used for rock excavation within the mining and construction business for both surface and underground applications. The division is headquartered in Fagersta, Sweden and has production in six continents.