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.

From: Market Sectors

Mining Applications

Mobile asphalt plant

The mobile crusher asphalt equipment in a single process unit thus eliminating process heat loss due to material transportation. The asphalt minerals also benefit from the conducted heat from the drum shell thus effecting further savings.

Features of mobile asphalt mining equipment

1. Modern Wet Mix Macadam Technology.
2. Produces High Quality Mix.
3. Portable or Stationary.
4. High Production Rate.
5. Easy to Operate.
6. Highly Accurate Aggregate & Additives Feeder.
7. Manufactured as per MORTH Specification.
8. All components used in the plant are of top quality, with ISI Certification wherever available.
9. All moving parts and electrical parts of wet mix plant are provided with safety covers.
10. Ease of Lubrication and dismantling has been built into the design for efficient maintenance and repair.
12. Manufacturing is done with advance, internationally recognized techniques.

Mobile asphalt mixing machine

This kind of mobile asphalt mixing plants and equipments is widely used for producing asphalts, known as a type of industrial materials that do play an essential role in nowadays construction and maintenance work of asphalt roads.

We are always working to provide you with latest technology and world class standard mobile asphalt mixing machine. our asphalt mixing plants & equipments has been acclaimed worldwide. Totally dedicated to full customer satisfaction we strive for the best in terms of sales and service.

Nordberg HP4 and HP5 Cone Crushers from Metso

The Nordberg HP5 follows the successful HP4 as the second model of an all-new range of high-performance cone crushers, benefiting from the

very latest in Metso crushing technology. Its heavy duty design derives from our 70+ years of experience with the Symons cone crusher, known worldwide for its rugged construction and application versatility. Labor-saving features such as hydraulic setting adjustment, tramp release and cavity clearing recall the innovative Nordberg Omnicone and first generation of Nordberg HP crushers. The HP4 and HP5 achieve new heights with unique features that produce the highest reduction ratios, ease of operation and low maintenance requirements.
Highest performance
The HP4 and HP5 cone crusher enable you to produce much finer products with fewer crushing stages, thereby lowering costs and saving energy. With a combination of optimized speed and large throw, HP4 and HP5 provide the highest reduction ratios of any current cone crusher. Due to their highly efficient crushing action, the HP4 and HP5 have high power utilization per cone diameter. As a result, you save twice with lower energy costs per ton of crushed end product and with lower recirculation load.

Higher cavity density improves crushing action for end products with more consistent gradation and superior shape. The new crushers maintain the proven threaded rotating bowl design. Comparative tests show equalized wear and more consistent setting around the entire circumference of the crushing chamber. Also the use of a newly designed tramp release system, with fixed return point, ensures that the crusher setting is maintained even after passing a piece of tramp iron.

Less downtime
Another way the crushers deliver is less downtime and increased operator confidence. Dual-acting hydraulic tramp release cylinders let the HP4 and HP5 pass tramp iron that would stall, or damage, many other crushers. If the jaw crushers does stop under load, the dual-acting cylinders provide a large clearing stroke, independent of liner wear, to quickly clear the crushing cavity.

An advanced fastening system for the mantle and bowl liner makes backing material unnecessary, and makes liner changes faster. When liners are changed or the crusher is reconfigured, the same hydraulic motors that rotate the bowl for setting adjustment will rotate the bowl completely out of the adjustment ring threads, greatly simplifying liner replacement. A new fixed counterweight guard protects the counterweight and seals out dust.
Easy to maintain
Bronze bushings used throughout provide superior load capability in the dusty, high-shock crushing environment. They cost less than rolling element bearings and are easy to replace in the field with normal tools. The HP4 and HP5 are easy to disassemble. All components are accessible from the top or side. The bowl and head are easily removed with no interference fit.

Versatility
Due to their strength, speed range and ease of converting from coarse to extra fine applications, the HP4 and HP5 provide superior application flexibility.

• Save stockpile space by re-crushing excess or slow moving products without an intermediate crushing stage.
• Converting from coarse to extra fine application and back again just by changing liners and rpm.
• Liner and rpm combinations go from secondary applications to sand manufacturing.

Asset Protection
The new tramp release design also protects the main frame by smoothing out the impact forces and returning the bowl to its original position after passing tramp iron. Inside, a new fixed guard protects counterweight and seals out dust. An optional cover around the crusher protects employees from casual contact with adjustment and tramp release mechanisms. It also helps protect the workplace with reduced dust emissions. The environment benefits too from the advanced fastening system for mantle and bowl liner that do not require backing material.

Why Nordberg HP4 and HP5 Cone Crushers?

• Highest performance
• Less downtime
• Easy to maintain
• Versatility

Coal processing equipments in South Africa

South Africa is not only rich in metal mining, but also rich in the nonmetal mining resources. For example, the coal reserve is the seventh of the world. Now South Africa is one the chief coal production countries, it is the fourth largest exporting country of coal and it is also the leader production country of liquid fuel made of coal. So coal crusher for sale in South Africa has big market. With more investors focus on the South Africa coal industry, Double has won more and more gaze from these investors.

Coal Processing Equipment

South Africa coal processing equipments offered by Double are mainly jaw crusher, impact crusher, hammer crusher, ball mill and LM series grinding mills and feeder, screens and belt conveyors, etc. Many producers produce coal aggregates, the coal crushing plants are able to satisfy their requirements. Many producers produce coal powders or process coal ash; in this case, the coal grinding machineries are very important.

Coal crusher plants

The commonly process of coal crusher plant in South Africa are similar with each other. Jaw crushers crush big coal lumps to small ones when they dig out from well or from deposits. It is really a easy work for Double jaw crusher. Actually, Double jaw crushers can be used to crush numerous mining ores and different stones, such as granite, marble, basalt, gravels, limestone, gypsum, clay, manganese ore, chrome ore, iron ore, gold ore, copper ore and zinc ore and so on. As to the impact crushers, if the raw coal size is not very big, they can crush the lumps to small particles directly; if the raw coal size is big, impact crushers are used behind the jaw crushers. Though the application of impact crushers is wide, but impact crushers should used in crushing soft materials. If the coal deposit is small and producers just want to build one small coal production line in South Africa, Double hammer crushers are really good choices. Also, the output size of hammer crusher is quite small and adjustable, no other better machines are better than them in this function.

Coal grinding process

In the coal grinding process, ball mill and LM series grinding mills  are widely used. It is well-known that many factors must be cared when producers grind coal powders, for example the inflammability. Double LM series grinding mill and ball mill well solve these problems. And they are really high performance and price ratio products.

Till now, Double has many coal crushers and coal grinding mills used in South Africa. Though the scales are not very large, they do make many more South Africa people know Double. And we do believe our service and our products will help us enlarge our market in South Africa in the near future.

If you are one investor and plan to invest in South Africa coal industry, just be free to contact us; if you any problems about the coal crushing plants just be free to contact us. You can chat with our engineer on-line, the answer will be shown you immediately; you could also leave your email address with us, we will get in touch with you within 24 hours.

 

Gypsum Processing Equipments In Mauritania