INDUSTRIAL AND TRADE NOTES: A British Radium Discovery; Powdered Sugar Cane; Briquetting of Iron Ores; Potash Salts in Galicia; Smelting by Electricity; Petroleum Oil Gusher; Purchase of Iron Mines; Monazite and Zircon Production; Mine Rescue Service; Mexican Cement Plant; Cement from Blas Furnace Slag; Germany's Potash Deposits and Mines.

Abstract In the current practice of the Mining Rescue Service of the Czech Republic, since 2005, the insulated overpressure regenerative breathing apparatuses with a closed circuit and supply of medicinal oxygen are used as the backbone working breathing apparatuses. At the end of the year 2010, the compressed-air breathing apparatuses were introduced into the practice of the Mining Rescue Service of the Czech Republic, which, in precisely defined types of mine rescue service interventions and under precisely defined conditions, can replace the aforementioned backbone working insulated overpressure regenerative breathing apparatuses. Recently, mining rescue services in deep coal mines have been more and more often conducted under conditions of an irrespirable mine atmosphere containing high concentrations of carbon monoxide, but at the same time containing sufficient oxygen for the breathing physiology of mine rescuer (for example, interventions dealing with the disposal of machinery under conditions of occurrence of endogenous mining fire of coal). This fact, after a long time, has resumed again the discussion of miners' rescue experts about whether it would be possible to implement the use of breathing apparatuses filtrating carbon monoxide into practice by the Mining Rescue Services of the Czech Republic in order to ensure a sufficient level of safety for mining rescuers even in an unexpected and rapid decline of the oxygen amount in the mine air at the site of the mine rescue service. The benefit of the breathing apparatuses filtrating carbon monoxide is their significantly lower weight, long protection period and also significantly smaller dimensions and design variability of the device. The disadvantages are higher breathing resistances and a higher temperature of the air mass inhaled from the breathing apparatus filtrating carbon monoxide.

Download Full-text

STUDY OF SOLIDIFYING MIXTURES IN MINING KRYVYI RIH IRON ORE DEPOSIT “KIROV”

10.31713/m1012 ◽

2021 ◽

Author(s):

Serhii Pysmennyi ◽

◽

Valerii Pozdniakov ◽

Victoria Biluk ◽

◽

...

Keyword(s):

Blast Furnace ◽

Blast Furnace Slag ◽

Iron Ore ◽

Temperature Fluctuations ◽

Iron Ores ◽

Ore Deposit ◽

Labour Costs ◽

Iron Ore Deposit ◽

Technical And Economic Indicators ◽

Furnace Slag

The work addresses the issue of selecting a solidifying mixture when mining deposits of naturally lean iron ores by open stoping systems to decrease mining costs without the concern for surface subsidence. Magnetite quartzites are mined by systems applied to mining naturally rich iron ores that provide for leaving significant reserves in pillars. In view of the above, when mining magnetite quartzites, it is reasonable to consider application of open stoping with backfilling. Application of polymer additives in the backfill instead of cement allows decreasing costs for water and binders while retaining its strength. As they are able to couple with any binders and fillers, polymers can be added to not only concretes and cement grouts. This provides opportunities to widely use mining and concentrating wastes, i.e. slag and waste rock. Advantages of applying mixtures with plasticizers are: lower labour costs, reduced risks of cracking, increased abrasion resistance, lower shrinkage, increased resistance to temperature fluctuations, backfilling without vibrations, a longer concrete mixture lifecycle. Aggregate technical and economic indicators demonstrate that with similar physical properties of the backfill, polymer-based backfilling is 2-3 times cheaper as compared with the cement-based one. Thus, when stoping with backfilling at Artem underground mine, it is advisable to use a polymer blast furnace slag backfill as a solidifying mixture.

Download Full-text

Peculiarities of work conditions for the staff of the state military mine-rescue service in coal industry of Ukraine

Ukrainian Journal of Occupational Health ◽

10.33573/ujoh2017.03.003 ◽

2017 ◽

Vol 2017 (3) ◽

pp. 3-10 ◽

Cited By ~ 2

Author(s):

V. I. Chernyuk ◽

◽

O. I. Soloviev ◽

S. M. Smolanov ◽

A. A. Pilipenko ◽

...

Keyword(s):

Work Conditions ◽

Coal Industry ◽

The State ◽

Rescue Service ◽

Mine Rescue

Download Full-text

Experimental Studies on Sugar Cane Bagasse Ash based Geomaterials

International Journal of Engineering and Management Research ◽

10.31033/ijemr.11.5.1 ◽

2021 ◽

Vol 11 (5) ◽

Author(s):

Nikhade H.R. ◽

B. Ram Rathan Lal

Keyword(s):

Compressive Strength ◽

Glass Fiber ◽

Glass Fibre ◽

Sugar Cane ◽

Blast Furnace Slag ◽

Compressive Loading ◽

Sugar Cane Bagasse ◽

Sugar Cane Bagasse Ash ◽

The Cost ◽

Furnace Slag

Use of conventional materials is increasing day by day due to rapid infrastructural growth which increases the cost of materials and increases the cost of construction. Hence utilization of Sugar cane bagasse ash waste materials without causing threat to environment solves the problems of disposal and also can provide economical materials. In this study glass fiber, sugarcane bagasse ash and blast furnace slag were used and cement used for binding purpose. Different mix ratio was prepared to understand the effect of addition of glass fibre on sugar cane bagasse ash based materials under compressive loading. The mix ratio was taken 0.2 to 1.0% for the research work. Blast furnace slag was added 10% to weight of sugar cane bagasse ash. The sample were tested for compressive loading for 7, 14, 28 days respectively. The density is most important parameter of materials. It was observed that the density of materials significantly influences with addition of glass fibre. The density of materials decreases with percentage of glass fiber increase. The density of materials varies between 901.1 kg/m3 to 741.10kg/m3The compressive strength also significantly affected by percentages of glass fibre. The compressive strength ranging 82 kPa to 798 kPa. The compressive strength increases up to certain mix ratio then decrease continuously. The stiffness of sugar cane bagasse ash specimens reinforced with glass fiber at cement 20% more than 15% and 10%.The stiffness also increase with the curing period. The maximum load was observed at 0.6% mix ratio. The stress strain behavior was observed to be nonlinear.

Download Full-text