Mechanical Technology Archive

Thyssenkrupp’s production-boosting mobile, semi-mobile and stationary crushing systems assist customers in optimising their comminution processes and increasing their equipment efficiencies.

thyssenkrupp crushing plantsRising costs of labour, fuel and consumables and the trend to more stringent governmental regulations and taxation schemes related to greenhouse gases (CO2 emissions) are the driving force behind mining companies around the world rethinking their conventional truck shovel mining methods.

Furthermore, mines and plants have to find ways to process large tonnages of low-grade ore at low costs and in an energy-efficient manner to overcome the many hurdles triggered by a sluggish global economy and low commodity prices, as well as the challenge of depleting higher-grade ore bodies. “Because these challenges are accelerating, low operational costs and equipment efficiency are at the top of most mines’ and plants’ priority lists, so we are focusing strongly on service and process optimisation for our customers,” says Wilfred Barkhuizen, manager – minerals processing, power and energy, thyssenkrupp South Africa.

Barkhuizen points out that the design of efficient and cost-effective comminution systems requires “specific experience”. He says this is where thyssenkrupp’s competencies and capabilities take centre stage. The company encompasses more than 100 years of experience in its crushing technology, engineering and design. Continued in- vestment in R&D and close customer cooperation spearhead innovative, state- of-the-art crushing plants that are energy efficient and economical to operate.

Semi-mobile crushing plants (SMCP) vary in design and capacity to offer different equipment solutions for diverse commodity applications, with output delivery ranging between 200 t/h to 12 000 t/h, depending on the requirement. There are currently about 257 thyssenkrupp SMCP installations in operation globally.

“We can supply a SMCP for most in-pit mineral mining applications, depending on the pit planning design,” says thyssenkrupp minerals processing product manager, Demitri Kokoroyanis. Thyssenkrupp’s cost-effective in-pit semi-mobile crushing solutions are well suited for coal and ore applications and can lead to significantly reduced operating and capital expenditure (opex and capex).

“In terms of opex savings, our in-pit crushing and conveying (IPCC) systems reduce the requirement for intermit- tent materials transport – using fewer trucks lowers diesel consumption, CO2 emissions, fleet maintenance costs and labour,” adds Kokoroyanis.

The plant’s support on pontoons is designed to accommodate all static and dynamic loads and only requires a simple base to transfer the necessary ground pressure. In most cases, a bed of compacted gravel is all that is required to ensure a suitable foundation and, since the gravel bed is acting as a buffer, the plants are particularly suitable for mine sites affected by frequent seismic activity. As a result, costly civil work can be eliminated or substantial savings can be realised compared with common stationary crushing plants.

Another benefit is the ability of the SMCPs to be moved by transport crawlers or self-propelled modular transporters. Usually, after being stationed in one place for a number of years, it can be moved into the mine closer to the actual excavation point to minimise truck haul- age distances. Kokoroyanis adds that thyssenkrupp’s specialist mine planning service offers advice to customers on how best to incorporate an IPCC system.

The fact that machinery is not overly complex and the main system can be connected to and controlled from the operation room, facilitates equipment monitoring by semi-skilled operators. The IPCC system has a feature that enables it to connect to a global service centre in Germany, which allows for constant system monitoring, 24/7.

The slowdown in large new projects has paved the way for an increase in upgrades and optimisation of existing plants. Kokoroyanis and Barkhuizen add that, despite the current state of the mining industry, neither sales nor interest in SMCPs and IPCCs has waned and that they have seen “a significant increase” in interest in some mining areas on the African continent.

Smaller thyssenkrupp installations for cement and aggregate plants are operational in Central and North Africa and the company is currently assisting the client of a large global minerals company in an existing Zambian copper operation to assemble and install five SMCPs.

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