Siemag begins work on an iron ore project in China

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German shaft-lifting technology company Siemag Tecberg has started work on a hoisting and hauling system at an iron ore mine operated by Chinese company Benxi Longxin Mining.

Siemag Tecberg signed a supply agreement with the company in 2017 for the delivery of three sets of lifting and conveying systems, to be split between two shafts at the Sishanling iron ore mine near the town of Benxi in Liaoning Province.

The Sishanling iron ore mine is one of the largest iron ore mines currently being opened in China, the statement noted. The mine has 2.5 billion tonnes of proven iron ore reserves with an average iron content of approximately 31%.

Due to the concentrated ore body and its uniform distribution, these reserves lend themselves to large-scale extraction. They are the largest proven and registered iron ore deposits in China, with a long-term planned mining capacity of 30 million tons per year. Initially, 15 million tonnes will be reached per year over the next five years.

Benxi Longxin Mining originally planned a total of three production wells to be able to extract a total of 15 million tons per year in the first stage, after intense consultation with SIEMAG TECBERG, the concept was optimized for two wells each producing 7 .5 million tons per year.

A service shaft equipped with a total of two service reels for transporting personnel and machinery will also be dug.

The overall concept therefore initially provides for a total of three lifting systems: a double production tipper

system in the production shaft in the form of a 6-rope machine of 6.75 m and a cage counterweight system for the transport of personnel and the machine in the form of a 6-rope machine of 6m and a smaller cage counterweight system for emergencies in the form of a 4m 4-cable machine in the service shaft.

The current agreement obliges SIEMAG TECBERG to undertake the engineering, production, delivery and supervision of the installation and initial commissioning of the following equipment:

Well lifting systems for the extraction of raw materials (production wells)

• System 1. Double bucket lifting system. Koepe 6-rope hoisting machine on lathe, dia. 6.75 m, for lifting buckets (payload 55 t per lifting bucket) to a depth of 1,500 m with an overall driving power of 16 MW (2 x 8 MW), which is designed for a performance of 7.5 mil lift. tons per year

Shaft lifting systems for personnel and material (service shafts)

• System 2. Large cage lifting system. Koepe lifting gear with 6 cables on the ground, diam. 6 m, for large cage lifting with a drive power of 3 MW (2 x 8 MW). Bearings, 2 sets of 6-cable cable pulleys for cable return, an ST3-F hydraulic braking system (closed loop technology) with 14 pairs of BE125 braking elements, 2 sets of SM150 indirect converters (IGBT), Automation equipment including machine control system, power distribution system and well signaling system and loading and unloading control complete this set of lifting system.

Finally, there is the Cage lifting system. Koepe lifting gear with 4 cables on the ground, diam. 4.5 m, for cage lifting with 1 MW drive power. 2 sets of 4-cable pulleys for cable return, an ST3-F hydraulic braking system (closed loop technology) with 6 pairs of BE125 braking elements, 1 set of SM150 indirect converters (IGBT) and automation equipment including machine control system complete this packing lifting system.

The special feature of the three lifting systems is the central control system. The control room is located in the hoist hall of the service shaft. In normal operation, the lifting systems in the production and service shafts are all in automatic lifting operation. In addition, the two service shaft systems are equipped with wireless communication devices that allow the lifting gear to be controlled directly from the shaft. This allows staff to reach different levels directly.

The operator has also started preparations for the expansion of production well no. 2 in order to reach the level of expansion of 2 x 7.5 million tonnes per year in the medium term. Siemag said he is also consulting on this.

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