Abowerbung

Glückauf!

Munich played host to this year’s bauma trade fair in the final week of October. In spite of ongoing difficulties in the form of supply chain problems, skills shortages, price increases and inflation this globally significant event, which is a key date in the calendar of the construction, building materials and mining sectors, exceeded all expectations both in terms of exhibitor numbers and visitor turnout. For the 13th time the bauma Innovation Award was also awarded in a ceremony held immediately before the fair opened, with three of the five top awards being given for developments in the mining and tunnelling sector: namely, a hydrogen-powered excavator …

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With my best regards // Mit freundlichem Glückauf
Dipl.-Ing. Andreas-Peter Sitte
Chief Editor Mining Report Glückauf, Essen

ISSUE 06/2022 // FOCUS OF THIS ISSUE: DUST CONTROL

Emerging Global Trends in the Extractive Industry – International Potential and Future Roles of Remediation Expertise from Germany

Fig. 1. Remediating waste rock dumps. // Bild 1. Sanierung einer Halde für Altgestein. Photos/Fotos: Wismut

Never in history were more mineral resources extracted than at present. In the past 20 years alone global metal ore extraction doubled. If current growth rates continue, more metals will be mined by 2028 than from the beginning of humankind to 2013. This exploding demand is set to rise even further as fossil-fuel based economies transform into low-carbon societies. Along with expanded mining, inevitably, associated environmental impacts are also poised to increase. These impacts may be even more severe than in the past as future deposits are more difficult to mine …

Authors: Dr. Michael Paul, Wismut GmbH, Chemnitz/Germany, Dr. habil. Frank Winde, Wismut GmbH, Chemnitz/Germany, North-West University, Potchefstroom/South-Africa

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Suspend Coal Phase-Out – Keep Existing Plants in Operation and Reactivate Available Capacities, Give Transition More Time

Fig. 1. Legally scheduled exit path for coal-fired power generation. // Bild 1. Gesetzlich vorgesehener Ausstiegpfad für die Kohleverstromung. Source/Quelle: BMUV

While there are no fundamental doubts about the direction of the energy transition in Germany – much less the goal of achieving sustainability – the changes in the general circumstances dictating energy policy that have occurred in 2022 give rise to sound arguments in favour of suspending the coal phase-out agreed in Germany. Current law requires the completion of the exit “by no later than 2038”; the coalition agreement of the “traffic light government” expresses the hope that the process will be concluded “ideally as early as 2030.” But in reaction to the “new era” impacting energy policies in Germany and elsewhere and the acute natural gas emergency, the previously set path for the coal phase-out is already …

Author: Prof. Dr. rer. oec. Kai van de Loo, Forschungszentrum Nachbergbau (FZN), TH Georg Agricola (THGA), Bochum/Germany

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Securing an Air Shaft in Witten, Taking into Account an Overburdened Mine Water Level

Fig. 7. Safety concept (section and top view). // Bild 7. Sicherungskonzept (Schnitt und Draufsicht). Photo/Foto: Fichtner Mining & Environment GmbH

At the beginning of March 2020, the Arnsberg District Government, Department of Mining and Energy in NRW, Dortmund/Germany, was notified of a repeated significant inflow of water in the area of a residential building in Witten. In view of the damage that had already occurred to the building and according to the assessment of the mining situation shown in the mine map and other maps, the cause of the water inflow and the ground movements apparently triggered by it was very probably of mining origin. On the basis of the present specific hazard situation …

Authors: Dipl.-Ing. Ingo Milas, Dipl.-Ing. Nicole Reinersmann, Abteilung Bergbau und Energie, Bezirksregierung Arnsberg, Dortmund/Germany

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Development and State of the Art of Dust Control in International Mining and Tunnelling

Fig. 3. Full-face cutting machine tunnelling. // Bild 3. Vollschnittmaschinenvortrieb. Photo/Foto: CFT

The quest for safety for man and machine is becoming increasingly important in mining and tunnelling worldwide. Due to the mechanisation of sinking, tunnelling and extraction work in underground mining and processing, the amount of dust generated in the various work processes has steadily increased – in line with the increase in performance. Although the occupational disease silicosis, which is subject to compensation, could be reduced in Europe due to the success of modern dust control methods, this occupational disease is still …

Author: Dr.-Ing. Reinhold Both, CFT GmbH, Marl/Germany

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Dust Control in a Novel Technology for the Construction of Shafts

Fig. 4. Dry dust extractor on WD 9. // Bild 4. Trockenentstauber auf WD 9. Source/Quelle: Herrenknecht/Redpath Deilmann

In Belarus, potash mining has been carried out intensively for about 60 years, so far by the state-owned company Belaruskali in six mines. Since 2011, the privately financed Nezhinskiy mine has been planned in the deposit near Soligorsk, and construction of this greenfield mine started in 2016. The planning from 2011 initially envisaged the sinking of two shafts using the freezing method and the application of drilling and blasting. In 2016, the future operator Slavkaliy decided to use a new technology for sinking, mechanized shaft drilling from the solid with machines …

Author: Dipl.-Ing. Thomas Ahlbrecht, Redpath Deilmann GmbH, Dortmund/Germany

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Heat and Moisture Related Ventilation Problems for Dust Extraction Efficiency during Underground Roadheading Operations

Fig. 1. Temperature profile over the measurement period showing temperature levels above ground and at four test points below ground. // Bild 1. Temperaturverlauf über den Messzeitraum über Tage und an vier Stellen unter Tage.

Ventilation measurements and data from several days of underground monitoring were used to record the actual status of the mine climate and ventilation circuit at a rock salt mine. This provided the basis for identifying a number of critical parameters, including the problem of dust collection around boom-type heading machines. This information was then used to determine where potential improvements could be made to the ventilation system and mine planning process.

Authors: Dr.-Ing. Jürgen Weyer, TU Bergakademie Freiberg, Freiberg/Germany, Dipl.-Ing. Thomas Teichert und Dr.-Ing. Sascha Engler, ERCOSPLAN Ingenieurgesellschaft Geotechnik und Bergbau mbH, Erfurt/Germany

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Technical Aspects of Auxiliary Ventilation at Dust-Intensive Workplaces

Fig. 5. Dry-type dust extractor with compact elements – newly patented system from CFT. // Bild 5. System Trockenentstauber mit Kompaktelementen – patentiertes neues System CFT. Source/Quelle: CFT

Many different technical relationships and parameters have to be taken into account for the professional cleaning of dust-laden air. Filtering the dust load from the air requires a fan system to set the air in motion so that it can pass through the filters. In mechanised drivages and conventional tunnelling operations the technical ventilation methods being deployed have to be matched exactly to the dust extraction system. Air speeds, clearances, pressure surcharges, climate parameters and many other factors all have to be included in the auxiliary ventilation regime to create an efficient dust evacuation process and in this way to ensure that clean air is available at the workplace.

Author: Dipl.-Ing. Jens Kegenhoff, Korfmann Lufttechnik GmbH, Witten

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Continuous Respirable Dust Monitoring with Localization

Fig. 4. Dust concentration values for Edgar Mine. // Bild 4. Staubkonzentrationswerte in der Edgar-Versuchsgrube. Source/Quelle: CSM

The U.S. Mine Safety and Health Administration (MSHA) mandates the use of continuous personal dust monitors (PDM) in underground mines to verify compliance with mandatory respirable dust standards. Regulation 30 CFR §70.100 establishes a limit of 1.5 mg/m3 averaged over an eight hour working shift. Miners who work in dusty conditions are required to wear the PDM for several shifts each month to document that they are not overexposed to respirable dust. The PDM uses frequency changes in a tapered element oscillating microbalance (TEOM) to measure inhaled, respirable dust concentrations …

Authors: Ergin Isleyen PhD, Prof. Dr.-Ing. Jürgen F. Brune, Prof. Dr.-Ing. Sebnem H. Duzgun, Colorado School of Mines, Golden, CO/USA

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The Natural Resources Sector in Transition: Paths to Sustainability

Fig. 3. DMT consulting experts support clients with the specialized four-step program for digital transformation. // Bild 3. Die Beratungsexperten der DMT unterstützen Kunden mit dem spezialisierten Vier-Stufen-Programm zur digitalen Transformation. Photo/Foto: DMT

The mining industry plays a key role in the transformation towards a climate-neutral economy. The natural resources sector makes an important contribution to a sustainable world. The importance of natural resources and the functioning of international supply chains have been clearly demonstrated by current geopolitical events, as well as previously by the Corona pandemic. No economic model can do without natural resources – the question is …

Author:  Jens-Peter Lux, Managing Director, DMT GROUP, Essen/Germany

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