COMMINUTION AND CRUSHING
The new Weir Minerals Trio ® TP1400 cone crusher
In addition to its Trio ® product range, Weir Minerals is also a recognised leader in HPGR its partnership agreement with KHD Humboldt Wedag in 2013. The Weir Minerals’ European Engineering team introduced larger units to their product portfolio such as the Enduron ® RPM 32 280 / 280 HPGR units. These larger HPGR units will accept feed sizes up to 90 mm and produce a-3 mm product.
“ We manufacture all of our HPGRs in-house out of our DCO in the Netherlands and offer a full product range from small HPGRs through to large scale HPGRs and, as a result, can cover a wide variety of tonnages in the marketplace,” states Stuart Hayton, Sales and Marketing Director for Weir Minerals Netherlands. Weir Minerals says its innovative HPGR technology enables it to carry out quick roll changes, paving the way for uptime, efficiency and, most importantly, increases in customers’ return on investment.
“ We offer industry leading wear technology with advanced stud technology and can offer some of the longest wear guarantees in the market,” says Hayton. Weir Minerals told IM it will continue its aggressive product development and expansion to enhance its comminution offering.
MMD updates on Mineral Sizer evolution
From Mineral Sizers to the world’ s most advanced Fully Mobile Sizer, for nearly 40 years MMD has been at the forefront of mineral sizing and In-Pit Sizing & Conveying( IPSC) technology. Established in 1978, MMD designed and
The MMD Mineral Sizer has been well proven in China patented the Twin Shaft MINERAL SIZER™ for the underground coal industry.“ Today, the Mineral Sizer handles over 80 different minerals in more than 70 countries worldwide, with the ability to process both wet sticky material and hard dry rock, or a combination of both through the same machine.”
The basic design concept behind
Mineral Sizer technology involves the use of two rotors with large teeth, on small-diameter shafts, driven at a low speed by a high torque drive system. Mineral Sizers exploit the already inherent weakness in rocks. The patented tooth geometry and configuration subjects the material to stress, bending, tension and shear forces in an effective and quick three-stage breaking action.
A breaker bar, located beneath and between the twin shafts, provides the final stage of breaking in the centre of the machine for maximum control of the finished product size in all three dimensions. The Mineral Sizer is designed to accept minerals without the need for pre-screening. The scroll formation of the teeth draws larger lumps evenly along the shafts, whilst creating space for undersized material to pass through freely without further wear or degradation. It is also capable of handling foreign material without suffering severe damage.“ The agitating action of its twin shafts also makes it ideal for blending material at high throughput rates, whilst minimising the generation of dust and fine material in primary, secondary or tertiary applications.”
MMD states that when a Mineral Sizer is used in a primary application, the highest possible reduction ratio is used to get the material as small as possible, as quickly as possible; therefore, the sizing effort needs to be at its maximum at the first stage, where a sizer’ s larger wear components translate into extended operating throughput. In the secondary sizing stage, the machine is geared towards final product size, or‘ finishing.’ This typically allows for lower reduction ratios with minimal wear and the hardest work to be done by the primary unit.
A full range of MMD Mineral Sizers are available, depending on the application and requirements of the customer. The machine’ s compact dimensions make it ideal for mobile installations or retrofitting in underground operations where space is limited. A key design benefit is that all the breaking forces are fully contained within the frame, with the machine requiring minimal support structure.“ In both underground and surface applications, MMD’ s Sizer technology delivers high capacity, versatile and compact machines that size as well as crush material. Shaft dimensions and teeth designs can be customised for each application.”
First exhibited at IMME 2016 in India, MMD’ s latest generation of light duty 625 Series Sizers are specifically optimised for coal processing“ and are perfectly suited for reducing ROM coal to a conveyable size for the preparation plant. Increased wear life and low-level power consumption enable operators to attain their efficiency and productivity goals.”
Elsewhere, the MMD flagship Fully Mobile Sizer in China“ has been truly tried and tested” says the group.“ This cost-effective solution can process at an average capacity of 9,000 t / h – with peaks of 14,000 t / h demonstrated – eliminating the need for trucks altogether.” MMD has also deployed successful modular semimobile sizing stations worldwide to take advantage of cost-effective short haul truck and shovel operations. High throughputs and short relocation times enable mines to achieve their efficiency and productivity goals whilst delivering a greener approach to mining.
Introducing the Joy MVT-II
Joy Global has supplied customers with more than 2,500 feeder-breakers to date, both underground and in surface mining. Thanks to its decades of experience in the industry, Joy Global is able to provide machines with high capacities that work in difficult applications.“ Joy has supplied feeder-breakers with capacities over 6,000 t / h and can crush materials with a compressive strength of over 200 MPa. A feederbreaker is unique in that the mineral moves horizontally through the machine. This allows the installation height of a feeder-breaker to be lower than most other types of crushing equipment with comparable capacity. A low installation height reduces the civil works cost of a typical primary crushing installation by reducing the height of the retaining wall. The lower centre of gravity allows the machine to be more easily relocated. Combining low installation cost and ease of relocation make feeder-breakers a good fit for customers looking for a semi-mobile crushing station.”
Recent surface mining applications for Joy feeder-breakers include limestone, phosphate, coal, bauxite, overburden, nickel and gold ores.“ If you compare an 8,000 t / h gyratory crusher to two 4,000 t / h feeder breakers in a hard abrasive application like copper ore, the gyratory has a
58 International Mining | MARCH 2017