End of 2021，Wirtgen Surface Mining Machine 280 SMi In the industrial city of Kivioli in northern Estonia,（Kiviõli）Put into operation。This machine is used for selective extraction of oil shale and limestone.，Its greatest advantage is that：The material is cut to the desired grain size during the mining process.，For direct use in further processing，No additional crushing and screening required。
Reliability trusted by professionals
Since 2006，Kiviõli Keemiatööstus （Hereinafter referred to asKKT） The company has been mining limestone and oil shale with Wirtgen surface mining machines.。“
Selective mining process，The lossless exploitation of oil shale is realized。Use this Wirtgen Surface Mining Machine，We can separate the oil shale cleanly from the limestone layer.，And extract pure、Quality materials。Drilling and blasting cannot achieve such an ideal effect.，Because the minerals are mixed together during blasting.。”
The person in charge of the mine Dmitrij Nikolaev Say，Oil shale can be used as fuel.，This requires breaking it to a specific size.，The Wirtgen opencast mining machine, on the other hand, is capable of producing precisely graded material from the start of construction，Thereby saving the time-consuming crushing and classification preparation work of the traditional drilling and blasting method in the mining of primary mineral materials.。
“Use this Wirtgen Surface Mining Machine，We can separate the oil shale cleanly from the limestone layer.，And extract pure、High-quality mineral aggregate。The drilling and blasting method can not achieve this ideal effect.，Because the minerals were mixed together in the explosion.。”The person in charge of the mine Dmitrij Nikolaev Express。
It can also be exploited effectively in the face of professional working conditions.
280 SMi Mining limestone and oil shale with surface mining machine，Compressive strength is 30 MPa To 120 MPa Between。It is equipped with a cutting width of 2750 mm、Cutting depth up to 650 mm Cutting rotor，This is an efficient ore mining equipment.，The centrally-mounted rotor design is particularly suitable for the efficient mining of hard deposits。、
Hard-wearing head and shoe system means less standby time，While hard rock type cutting rotors also provide greater durability in hard rock formations.。In addition，Various automation functions not only greatly improve the working comfort of the operator，The risk of fatigue is also reduced.，Helps achieve higher yield。
Use 280 SMi Achieve the desired result layer by layer
KKT The company uses the Wittgen 280 SMi Stripping of rock overburden by surface mining machine，Oil shale is then selectively mined.。Before entering the oil shale formation，Several metres of overburden must be stripped away.。For this reason，KKT The company adopts Wittgen's unique belt side throwing process.：280 SMi Strong use and conveying capacity，And the mineral aggregate can be stripped by a swing type rear discharge belt with height adjustment.，The stripped mineral aggregate is stacked on the working surface on the side of the machine in the form of a material belt.。
The advantage of side discharge is independent construction.，Simplifies the loading process for Excavators and Wheel Loader，Making the entire mining process more economical and efficient than other methods，This allows the surface mining machine to operate at a desired efficiency，Time lost waiting for the Truck is also avoided。
At Kiviõli，The ratio of oil shale to limestone is 1：3，Therefore, it is very important to have a machine that can handle different hardness grades of mineral materials.。Compressive strength up to 60 MPa In the oil shale formation.，280 SMi Full depth cutting is possible，Its operating speed is up to 15 m/min，Have a considerable advantage in terms of yield。
Kiviõli Unconfined compressive strength of limestone（UCS）At 60 MPa To 120 MPa Between ，It's hard to cut。Be that as it may，280 SMi Can still be reliably mined layer by layer，Cut the limestone at the required yield。In the process of reclamation，Pre-crushed limestone is easier to manage，There is no need for a time-consuming process of re-breaking of large rock masses, as after drilling or blasting，Cutting stock can be easily placed in the desired area。
All year round，Efficient operation
Complete mining at one time，Cutting depth up to 650 mm
Maintenance points are easily accessible
Two generations of open-pit mining machines in the same frame：280 SMi And 2500 SM
Pay close attention to sustainable development
The leveling technology of the Wirtgen Surface Mining Machine cleanly separates limestone and oil shale layers，And ensure the quality of ore.，And no additional processing is required.，Thereby reducing carbon emissions.。In addition to the selective extraction of mineral material，Accurate leveling system can also realize effective drainage management in mine construction.。
280 SMi The surface mining machine can mine according to the preset vertical and horizontal slopes，O as to optimize the drainage channel in the mining plate.，Avoid flooding deeper pits like drill and blast method，Make subsequent mining phases easier。A clean, flat working surface also means access for highway Trucks.，Compared to the mine card，Significant reduction in transportation costs。
Wittgen 280 SMi Easily handle challenges
As temperatures plummet to double digits below zero，Kiviõli There are about 100 days of snowfall each year.，Construction in cold regions，It is a big challenge for Surface Miners and operators.，All necessary operating devices on the machine are heated，So that that machine can operate efficiently throughout the day in such a cold environment。
Large scale LED Work light kit（It is equipped with six cameras that can be monitored in different directions./Monitoring System）And a rotary panoramic glass cab.（Equipped with air conditioning），Provides the operator with an excellent omni-directional field of vision，Day or night.。
High quality KKT The company was impressed.
KKT The company chose to buy Wittgen's 280. SMi A new type of surface mining machine，Because they found that the machine uses the mining process of side discharge of the belt.，Economical and efficient、Good value for money。Since 2012，They've also been using Wittgen's 2500. SM Open-pit mining machine，More than 30000 hours of operation，Its performance and reliability are proved by facts.。
