Mining engineer 180 table

To determine the fate of formaldehyde and formic acid in a coal mine, an unused shaft about 120 m long and 6 m2 in cross sectional area was selected for study. With a ventilation air flow of 190 m3/min and an engine exhaust flow of 1.5 m3/min, complete exhaust dispersion and dilution was observed in about 10 m. Samples collected in the mine air downstream of the diesel engine indicate no significant change in formic acid concentration at increasing distances from the engine (Table VIII). This is certainly not consistent with the loss of formaldehyde in the same interval. The mechanism for loss of formaldehyde is apparently not a gas phase oxidation to formic acid. Interaction with surfaces may be a more suitable explanation of the observed reduction in formaldehyde concentrations. 

Analytical Chemistry Batteries Catalysis, Homogeneous Catalysis, Industrial Electrochemical Engineering Isotopes, Separation AND Applications Metallogeny Mining Engineering Organometallic Chemistry Periodic Table (Chemistry) Photographic Processes and materials... 

Researchers at Sandia [3] and at the Cold Regions Research and Engineering Laboratory (CRRDC) [1] measured surface contamination on mine cases. Some of the results are highlighted in Table 4.1, based on data summarized by Phelan and Webb [1, p. 20],... 

In a later phase of work, the formic acid concentration in mine air subject to diesel emissions was measured. The expected concentrations were about one hundred times lower than those found in engine exhaust. The efficiency of the collection scheme was again measured under these conditions of challenge concentration (0.06 mg/m3). The collection efficiency was found to be 92.2% at this level (Table IV). 

Table I presents the proximate and the ultimate analyses of the coals used in the study. Coals A, B, D, and E were obtained from and analyzed by the United States Bureau of Mines. The coal samples were crushed by the Bureau to pass through 60 mesh before analyzing them. The coal which passed through 60 and was retained on 100 mesh was used in this study. Coal C was obtained directly from the mine and was analyzed by the Commercial Testing and Engineering Co., Cleveland, Ohio.

The table referred to in the quoted paragraph is from E. Hock and J. W. Bray, Rock Slope Engineering, The Institution of Mining Metallurgy, London, 1974. 

The rock burst happened in the mine s working Face No.6303 and No.6304 was caused by geological structure. See Table 4 for an engineering analogy on the geological structure of three faces. 

Refined lead is produced from both primary and secondary sources. Primary lead is that produced from mined ores, whilst secondary lead results from recycled materials such as battery plates and lead pipes. Recycled lead currently accounts for 14% of the world s production of refined lead (Table 1.2, cf. Table 1.1). The consumption of lead is concentrated primarily in only eight countries (Table 1.3). Storage batteries currently account for about half of the refined lead consumption in the western world (Table 1.4), whilst the production of tetraalkyllead, a petrol additive which reduces engine knock, accounts for about 10% of consumption. 

Coal has been used for centuries. Roman historians describe coal as a heating source, and coal was probably used in China 2000 years ago. Early coal mining was small scale and based on coal lying either on or very close to the surface. With the Industrial Revolution and the use of steam engines, coal became the preferred fuel and deep shaft mining became popular. Today, coal production has reached 3.3 billion tonnes oil equivalent (Table 5.1.30). 

Low-sulfur diesel. From 1991 in Sweden, 1995 in California, and 1998 in the rest of the United States, the sulfur content of on-road diesel has been limited to <500 wppm sulfur. Recently, EPA imposed tighter limits on sulfur in both on-road and non-road diesel Table 8). Non-road diesel is used in farm equipment, railroad engines, fork lifts, boats, and ships. Non-road rules also apply to diesel-powered generators, mining equipment, and baggage-handling equipment in airports. 

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