Granite processing plant

Jaw crusher for granite crushing: Jaw Crusher is widely used in granite processing plant. It is suitable for primary and secondary crushing all kinds of mineral ores and rocks with compressive strength less than 320 MPa.

Impact crusher is used for granite primary, secondary, fine crushing plant. It is widely used for sand and rock producing in the industry of roads, railways, reservoir, blasting of rock for processing and so on.

The portable crushing plant is not limited by the crushing place, and reduces high material transportation cost. The portable crushing plant can crush materials on site or work nearly. So, it is widely used in the industry of mining, metallurgy, building materials, traffic, and water conservancy facilities and so on. The portable crushing plant is the best crushing plant for granite stone quarry.

Vibrating screen is the granite screening machine used to screen out the suitable particles size. According to the different size of crushed stones and sands, choose the right screen cloth.
Granite crushing plant

In the granite crushing production lines, we can choose the right granite crushing machine according to the capacity. The granite stone crushing plant could be placed in concrete building or shed or open space. The usual crushing plants are as follows: 30-50tph, 50-80tph, 80-120tph, 120-200tph, 200-300tph, 300-400tph, 400-500tph.

We here recommend three proposals about the granite complete crushing plant:

Proposal 1: vibrating feeder + primary jaw crusher + secondary impact crusher + vibrating screen + belt conveying system + control system

Proposal 2: vibrating feeder + primary jaw crusher + fineness jaw crusher + impact crusher(optional)+ vibrating screen + belt conveying system +control system

Proposal 3: vibrating feeder +primary jaw crushers + cone crusher + fine impact crusher(optional)+ vibrating screen + belt conveying system + control system

In the above proposals, the main difference is the secondary crusher: using impact crusher, or using fineness jaw crusher, or Compound cone crusher. According to the fineness of the finished products, choose the right crushing machine to make up the complete granite crushing plant.
Granite aggregate manufacturing

In the construction aggregate production line, granite is crushed for manufacturing building aggregates and artifical sands.

SBM is a famous granite processing equipment manufacturer in China, and offer mining equipments, crusher, screening machine for granite quarry plant for producing aggregates and sands in USA, India, UAE, Canada, sri lanka, Italia, UK, Afghanistan, Angola.

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 installation of Ball Mill

The Ball Mill is and industrial grinding mill, through its installation, the client should pay attention to many things such as the installed base and safety issues.

Installed base:

1.The Ball Mill should be placed on the basis that has the appropriate height from the ground and strong steel concrete.If the foundation is sinking slightly, the level must be balanced.If not, the Ball Mill should not be installed.

2.The barrel of Ball Mill should has a appropriate height from the ground, in order to convenient for the changing of the plate and the grinding mediums and the fastening of the plate screws.

3. The design of the Ball Mill's installed base to some extent could refer to the blueprint that supplied by the manufactures. However, it shouldn't use as a working drawing. During the installation, we should major look at the real installation environment.

Matters need attention through the installation :

1.Before the installation of the Ball Mill, the users should carefully check if the size of Ball Mill's each part fit with the drawing requirements and if the equipments were all in readiness.

2.Before the installation of every element and unit of the Ball Mill, they should have a careful examination. The users must clear up the all kinds of the wounds, protection oil, dust and foul on the surface of the machine, in order to make sure that the machine could running normally.

3.During the installation, the users should daub some thin oil on the sliding surface of the machine. The surface of the regular connection should daub grease.

4.During the installation of the Ball Mill, the users should make a adequate protection of the frication surface and daub the grease on it, meanwhile, users should also put the clean oilskin on the dedicated backplate.

South Africa Grinding Mill

SBM is a grinding machine manufacturer in China, we export grinding mills to South Africa,India,Indonesia,Nigeria etc. Our grinding mill includes Ball mill, Raymond Mill, Vertical mill, Roller Mills…

MTM Trapezium Grinding Mill Introduction

The MTM Grinding Mill is called MTM Medium Speed Trapezium Mill. It is designed by our own engineers and technical workers basing on our 20 years’ manufacturing experience and absorbing foreign advance technology.

The grinder machine leading powder process in grinding mill industry, it’s pretty widely used in many countries as mining equipment to mill quarry, such as South Africa,  Zimbabwe, Ethiopia, Sri Lanka, Malaysia and plenty of other countries all over the world.

MTW Trapezium Grinding Mill Introduction

MTW Trapezium Grinding Mill is the latest grinding mill with the best technical level in the world; it owns many patented technologies such as internal thin oil lubrication system, arc-shaped air duct, and overall prick gear drive. The MTW Trapezium Grinding Mills are widely used as metallurgical grinding mills and mineral grinding mills all over the world.

Super Thin Grinding Mill Introduction

SCM Super Thin Grinding Mills designed by SBM are used for ultrafine grinding mills that absorb grinding mill technology advantages from abroad and domestic. With decades’ experiences, the SCM super thin grinding mill has reached the international level of ultra-fine grinding mills manufacturing. The output particle of ultrafine dust is so weeny that must be making you very exciting and feel incredible.

Coarse Powder Grinding Mill Introduction

The MXB Coarse Powder Mill is the ideal equipment with high performance and easy maintenance of coarse powder processing. It meets customers’ requirement in industrial mill and industrial grinding areas. The MXB Coarse Powder Mill based on our experts’ many years research experience in the milling industry and combined with practical application and then we have the world-class level in industrial mill and industrial grinding.

High Pressure Grinding Mill Introduction

High Pressure Grinding Mill is a newly kind of highly efficient grinding mill invented by Shibang for many years’ research and development of grinding mill. The patent product of our company is high efficiency and low energy consumption.Customers can have auxiliary equipments by oneself that enough to meet the needs.

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 mill, 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.

Shafter Silver Mine, United States of America

Shafter Silver mine is located in Presido county of southwest Texas, US. The mine is 100% owned and operated by US mining company, the Aurcana Corporation. It will be the second largest silver producing mine in the US and 14th largest in the world once it begins production in 2012.

The mine was acquired by Aurcana Corporation from Silver Standard Resources in July 2008 at a cost of $38.7m. Past owners of the mine included Presidio Mining (1881-1926), Gold Fields Mining Corporation (GFMC, 1926-1977) and Rio Grande Mining Company (1977-1994). Aurcana Corporation is currently redeveloping the mine.

The prefeasibility and full feasibility studies of the redevelopment were completed in June 2009 and September 2010 respectively. The equity financing for the project was completed in December 2010.

Reserves of silver at the Shafter mine

The proven and probable reserves at the Shafter mine as of September 2010 stand at 19.8 million ounces (moz) graded at 7.78oz/t silver. Measured and indicated resources are estimated at 24.6moz graded at 8.49oz/t silver. Inferred resources are estimated at 22.8moz, at an average grade of 10.52oz/t silver.

Geology and mineralisation of the Shafter silver mine area

"Shafter Silver mine is located in Presido county of southwest Texas, US. The mine is owned and operated by Aurcana Corporation."

The Shafter deposit was discovered by GFMC between 1977 and 1982 while carrying out a systematic surface drilling programme. It is classified into five exploration blocks along its east-west curve. The Shafter mining district hosts dikes, sills and rocks belonging to the Tertiary age group.

The mineralisation occurs in veins and manto type ore bodies in the lightly dipping beds of the Permian Mina Grande Formation (PMGF) which spans to a strike length of 4.8km.

Minerals such as silver, lead and zinc concentrates are hosted in the upper layers of PMGF as carbonate replacement deposits (CRD) formed due to the encroachment of dikes and sills.

The ore extracted from the mine hosts oxidised argentite and cerargyrite with conglomerations of quartz, calcite, goethite and lesser dolomite, hemimorphite, willemite, anglesite, galena, smithsonite and sphalerite.

Production rates and mining methods used at the Texas-based deposit

Production at the Shafter mine will commence in 2012. The mine is expected to produce 3.9moz of silver equivalent in the first two years.

The property was historically mined using underground mining techniques. It reported 35moz graded at 15.24oz/t of silver production between 1883 and 1942.

The development of the Shafter mine began in January 2011. The underground mining operations were recommenced in February 2011. All permits necessary to restart the production were obtained in November 2011.

The development works include tunnel rehabilitation, ball mill foundations, renovation of filter presses and construction of offices at the mine site. The works also include installation of two leach tanks, Merrill Crowe equipment and a 300ft deep ramp. Underground production equipment will be delivered to the mine site between December 2011 and April 2012.

The construction work is scheduled for completion in May 2012.

American Electric Power (AEP) is currently installing a new north to south transmission line parallel to the existing 69kV electric line at a cost of $1.2m to supply electric power to the mine and processing facility. The installation is expected to be complete by May 2012.

Ore processing

The ore stockpiled at the surface of the mine will be transported to the 525,000tpa processing plant by 30t haul trucks to carry out the crushing, grinding, leaching and smelting process.

"The mine was acquired by Aurcana Corporation from Silver Standard Resources in July 2008 at a cost of $38.7m."

The processing plant was initially designed for a throughput of 900tpd and was increased to 1,500tpd capacity in November 2011.

The ore will be crushed into fine ore in two stages using a jaw crusher and a cone crusher. The crushed ore will be fed to the grinding circuit and ground in a ball mill which comprises a self-cleaning trash belt magnet, consociated pumps, tanks and instrumentation.

The ground ore will be conveyed to the leached circuit to undergo cyanide leaching process and generate pregnant leach solution (PLS) and filter cake.

The filter presses will reclaim the PLS and filter cake from the leached circuit and convey them to the Merrill-Crowe Zinc Precipitation Circuit.

Silver is precipitated in the Merrill-Crowe system by adding zinc dust. The precipitates are transferred to a smelter which separates the silver from zinc and produces pure silver doré bars for export.

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.

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