The ores and minerals' crushing process

Stone Crushing  Process includes vibrating feeder, jaw crusher, cone crusher, impact crusher, vibrating screen, belt conveyor, electric controlling system and dust catcher etc. The designed capacity is from 50t/h to 500t/h. To meet customer’s specific requirement, we can make different design to meet various needs.

Crushing process does not happen by itself and it is not reversible. The external force must overcome the internal cohesion between particles in the rock. The cohesion, even for the same rock, differentiates greatly. It depends not only on the nature and structure of crystals in the rock, but also on the deficiencies of the crystals. These deficiencies may be macro-or micro-cracks. Due to the presence of cracks in the crystal, the connection between crystals becomes weak.

In stone crushing plant, jaw crusher is used as primary crusher machine, when big stones are crushed smaller after jaw crusher, they are transferred to impact crusher or cone crusher for secondary crushing, then go through the stone shaping machine for getting cubic size. Using screening machine to screen out the suitable building aggregates, while the unsuitable stones return to the crusher machine for re-crushing. The series of Jaw Crusher has the features of high crushing and even product size ratio. It can be used to crush material, whose compression strength is not more than 320Mpa.

Impact crusher is mainly used in secondary crushing. It can crush various rocks, high efficiency, easy maintenance, and cubic shape of the products. Impact crusher is widely used in mining, highway, and construction.

The series of cone crusher is used for crushing of ores and rocks, the advantages are: reliable structure, high efficiency, easy- to- adjust and economical.

SBM is a professional stone crushing machine manufacturer in China, located in Shanghai, and supplies, designs stone crushing plant for building aggregates and artificial sands. SBM can also supplies all types of other quarry equipments, coal crushig plant, gold mining equipment, aggregate crushing plant, concrete crushing plant for quarrying with reasonable price in Nigeria, India, New Zealand, Europe, Pakistan, Zambia, South Africa and other countries.

The Stone Crushing Production Line useing in the mining industry

Stone Crushing Production Line SBM Machinery manufactures various equipments for a whole set of stone production line, and we also could provides our clients the all-sided complete technical support. The whole production line consists of Vibrating Feeder, Jaw Crusher, Impact Crusher, Vibrating Screen, Belt Conveyor, electric control, etc. We design different production lines ranging 50 t/h to 500 t/h by combining different models of equipment which can match Cone Crusher.

Jaw Crusher, also called Stone Jaw Crusher or Rock Crusher ususlly, manufactured by SBM Machinery Co. Ltd. In the Stone Crushing Production Line, Jaw Crusher is mainly used for the primary and secondary crushing process of ores crushing and bulk materials.It is a kind of stone crushers,also called rock crusher,swing Jaw Crusher. Jaw Crushers are equipped with one fixed and one moveable crushing jaw (moving jaw), both of which support crushing plates (wearing parts) in several versions.

The SBM Machinery Impact Crusher has proven to be rugged, high performance and cost effective solutions in a variety of applications of Stone Crushing Production Line. Our customers will testify to both outstanding service and investment value. Our Impact Crushers are successfully crushing a wide range of materials such as limestone, dolomite, gravel, basalt, copper reverts, concrete and asphalt. Whether you need a portable, stationary impact crushing plant, we have the optimum, innovative solution for your specific needs.

Cone Crusher is widely used in mining, concrete factory, sandstone making,metallurgical, construction, road building, chemical and phosphatic industry, etc. The machinery's pressure resistance strength is under 350Mpa. And they are widely suitable for primary crushing of many kinds of mining and rock such as many kinds of ores, concrete, fireproof material, bauxite, quartzite, corundum, perlite, ironstone, basalt, etc.cone crusher contains many types such as Spring Cone Crusher, HPC Series Cone Crusher, HCS90 Type Cone Crusher. The cone crusher is characterized by great crushing force, high efficiency, great capacity, low cost, convenient adjustment and economical application, etc.

Our SBM Machinery is a professional heavy industrial company which is mainly produce the mining equipments for the mineral crushing and grinding clients. We also could provide the excellent mining equipments for the clients, but also could design many all-sided crushing and grinding line for our clients.

All-sided rock processing equipment

SBM Machinery has been serving the aggregate crushing & grinding industry for many years, it is one of the most famous rock and mineral processing company in the world. SBM Machinery provides rock processing equipment to support the construction, mining and recycle industries.

With over 30 years of experience, SBM Machinery has a group of bridle-wise workers and experienced on-site engineers, our company offers complete rock processing systems or individual components including crushers, grinding mills, vibrating screens and separators, conveyors, washing and screening equipment, feeders, hoppers and related replacement parts, who ensure every set of equipments is of high performance and high reliability.

Rock processing equipment is an efficient crushing equipment, which features self-drive, advanced technology and complete functions. In any terrain, these equipments can reach anywhere in the workplace. This can reduce the material handling operations, and to facilitate the coordination of all auxiliary machinery and equipment. Wireless remote control, you can easily open the breaker to the trailer, and move them to the job site. As no assembly time, so the device can be one job site to work immediately. Mobile rock processing equipment crushing jaw ratio, the optimum design to meet the needs of Crusher technical features, high productivity, uniform particle size products.

SBM Machinery is a professional rock processing machine manufacturer in China, located in Shanghai, design rock processing machine for building aggregates. We can also supplies all kinds of quarry equipments, coal crushig machine, aggregate rock crushing machine, concrete crushing machine for quarry with reasonable price in Nigeria, India, New Zealand, Europe, Pakistan, Zambia.

Cement ball mill for sale south africa

Cement Mill is composed of feeding part, discharging part, turning part and driving part (reducer, small driving gear, electric motor and electric control). The quill shaft adopts cast steel part and the liner is detachable. The turning gearwheel adopts casting hobbing process and the drum is equipped with wear-resistant liner, which has good wear-resistance. The machine is with stable and reliable working condition. Moreover, according to different materials and discharging methods, there are dry ball mills and wet ball mills for choice.

How Ball Mill Works

A Ball Mill grinds material by rotating a cylinder with steel grinding balls, causing the balls to fall back into the cylinder and onto the material to be ground. The rotation is usually between 4 to 20 revolutions per minute, depending upon the diameter of the mill. The larger the diameter, the slower the rotation. If the peripheral speed of the mill is too great, it begins to act like a centrifuge and the balls do not fall back, but stay on the perimeter of the mill.

The point where the mill becomes a centrifuge is called the “Critical Speed”, and ball mills usually operate at 65% to 75% of the critical speed.

Ball Mills are generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recirculated back into the mill to be reduced. Various classifiers, such as screens, spiral classifiers, cyclones and air classifiers are used for classifying the discharge from ball mills

Cement Roller Mill

Vertical Cement roller Mill is a brand new kind of large-scale grinding generator which is designed specially to resolve the problems of reduced capacity and higher consumption of industry grinding mills.

With decades of years research, vertical roller mill is designed as well as manufactured based on the advanced design idea. Now, vertical roller mill has applied widely in the exploration, chemistry, non-metallurgy and other countless industries.

Vertical roller mill for cement industry

Vertical roller mill can be used in the whole process of cement production. In the limestone crushing and milling plant, vertical roller mill can grind the limestone particles into fine powder; in the fossil fuel pulverizing plant, vertical roller mill can be used to grind the actual coal into good powder; in the gypsum milling plant, vertical roller mill will pulverize the gypsum in to ultrafine powder; in the cement clinker grinding process, vertical roller mill performs an important role too.

Vertical roller mill consists of feeding part, discharging component, turning part as well as driving part (reducer, small driving gear, motor unit and electric manage). The quill shaft adopts cast steel part and the liner is actually detachable. The turning gearwheel adopts casting hobbing process and the drum is equipped with wear-resistant lining, which has good wear-resistance. The actual cement mill machine is with stable and reliable working condition.

Cement vertical mill 

Cement vertical mill is the primary and new procedure equipment in thecement grinding plant. LM sequence cement vertical mill is of stronglcrushing, high crushing efficiency and good operational balance. Tosome extent, reducing the energy consumption or helping the systemoutput has solved concerns of low production of cement, runninginstability, etc.

Through replacing cement ball mill along with cement vertical mill, we can realize-the role associated with reducing energy usage. Relatively speaking, usingcement vertical mill to mill cement raw material, coal and blastfurnace slag continues to be fine for the older technology.

As long as wecontrol the actual cement particle size distribution, water demand, the typesof ingredients in the gypsum and grinding heat and so on, toachieve large-scale promotion of the cement vertical generator use is very guaranteeing.

Cerro De Maimon Copper and Gold Mine, Dominican Republic

Cerro De Maimon Copper and Gold Mine is located 70km northwest of Santo Domingo in the Monseñor Nouel Province in the Dominican Republic. The mine is 100% owned and operated by Australian company Perilya.

It was initially owned by Falconbridge Dominicana and was later acquired by the GlobeStar Mining Corporation (GMC) in April 2002. Perilya acquired GMC in January 2011.

Pincock Allen and Holt (PAH) was contracted in August 2003 to conduct feasibility study for the mine. The environmental licence was sanctioned in June 2004. Construction of the mine began in December 2006 and was completed in October 2008.

Feasibility studies to develop an underground mine and commission a separate zinc circuit are scheduled for completion in 2012.

Reserves of copper and gold

Proven and probable reserves at the Cerro De Maimon mine's sulphide ore stand at 5.3 million tons (mt) graded at 2.2% Cu, 0.85g/t Au and 27.6g/t Ag. The mine's oxide ore contains 901,000t of proven and probable reserves graded at 1.58g/t Au and 26.9g/t Ag.

Measured and indicated resources (sulphide and oxide ore) of the mine stand at 10.19mt graded at 1.44% Cu, 0.8g/t Au, 23.8g/t Ag and 0.99% Zn. The inferred resources are estimated at 379,000t graded at 0.82% Cu, 0.7g/t Au, 21.1g/t Ag and 0.87% Zn.

Geology of the Monseñor Nouel Province

"Cerro De Maimon Copper and Gold Mine is located northwest of Santo Domingo, Monseñor Nouel Province, Dominican Republic." SBM can supply you gold mining machinery for processing gold mineral resources. Gold mining machinery mainly includes gold crusher, gold mill, gold feeder, gold vibrating screen, gold belt conveyor etc.

The Cerro De Maimon is the largest volcanic massive sulphide deposit in the Maimon Formation which trends 70km along northwest to southeast of Dominican Republic.

The Maimon Formation contains metavolcanic and metasedimentary rocks including mafic, intermediate and felsic volcanic rocks belonging to the early Cretaceous age.

The deposits at the mine comprise massive to semi-massive copper-gold-zinc sulphide zone, overlaid by gold-silver oxidised gossan cap. They are 200m wide, 1000m long and 40m thick near surface.

The average thickness of the deposit is 12m. The massive sulphide zone is formed due to the venting and precipitation of the hydrothermal fluids on the seafloor, in the Caribbean volcanic island arc.

The oxidised gossan cap is formed due to the weathering of massive sulphide zone.

Mineralisation and production at Cerro De Maimon

Mineralisation at the massive sulphide zone occurs in the schists of pyrite, chalcopyrite, sphalerite, bornite, tennantite, tetrahedrite and galena.

The oxidised gossan cap contains goethite bearing gold and silver precipitates along with quartz, sericite, chlorite, minor calcite, barite, chalcocite and covellite.

Production at the Cerro De Maimon mine began in 2008. The mine produced 20.168 million pounds of Cu, 15,900oz of Au and 652,200oz of Ag in 2010. It is expected to produce 229 million pounds of Cu, 130,000oz of Au and 4.1moz of Ag between 2008 and 2017.

Open-pit mining and processing of ore at the Cerro De Maimon copper and gold mine

The deposits are mined using conventional open-pit excavation methods including drilling, exploring, blasting, loading and hauling. Hydraulic excavators, articulated and rigid body trucks are used to carry out mining operations.

"It was initially owned by Falconbridge Dominicana and was later acquired by the GlobeStar Mining Corporation (GMC) in April 2002."

The ore extracted is transferred to the appropriate sulphide or oxide ore stockpiles for processing.

Lyntek Engineers and Constructors was contracted in October 2004 to design and build two separate processing plants for treating sulphide and oxide ores. Both plants share the same crushing and conveying system.

The sulphide ore is passed through a 1,300 tons per day (tpd) flotation circuit and subsequently to a re-cleaner flotation column. The ore is grounded to 150 microns in the primary ball mill, which transfer the ground ore to secondary regrind mill for further grounding to 35 microns.

The ground ore is thickened and filtered in the flotation column to decrease the final moisture of the concentrate. It is finally transported to smelters.

The run of mine ore extracted from the gossan zone is ground in a ball mill circuit. The ground ore is conveyed to a conventional 700tpd cyanide mill to undergo cyanide leaching in a counter current decantation (CCD) circuit.

A gravity separation circuit receives the solution from CCD circuit and removes coarse grains and sulphides. The filtered solution is transferred to the Merrill-Crowe zinc precipitation circuit which recovers gold and silver dore bars for export.

Transportation and handling

The copper, gold and silver concentrates are loaded into haul trucks and transferred to the port of Rio Haina situated on the southern coast of the Dominican Republic for exportation to international customers.

Applications in Metallurgical Industry

In cement production process, most of the medium hard raw materials such as limestone, clay, iron ore and coal should be crushed .And we  have a wide range of choices of crushers such as Jaw crusher, Heavy hammer crusher, Impact crusher and Rolling crusher. Among the materials, limestone is the main one and it features big size and high hardness. So crushing limestone is more important in the cement production line.

General cement production line :  Vibrating feeder - Jaw Crushers - Impact Crusher - Vibrating Screen.-Mill or Vibrating feeder – Heavy hammer crusher - Vibrating Screen.-Mill. And the combination of the machines changes according to customers’ demands. For example，If they need to produce cement more than 2000t one day (10 working hours) .

They can choose these production lines(mining equipments):
JSZSW3890 vibrating feeder---JSPE600×900Jaw crusher---1400 heavy hammer crusher--- JSYZ1450 vibrating screen---Mill(Capacity ≥200t/h)
JSZSW4911vibrating feeder---JSPE750×1060Jaw crusher---1315Impact crusher--- JSYZ2070 vibrating screen---Mill(Capacity ≥200t/h)

Application in Metallurgical Industry