By Ulrich Förstner (auth.), Dr. José M. Azcue (eds.)
Since the mining continues to be increasing, accomplished info at the results of mining actions at the setting is required. This ebook offers info on organic and physico-chemical remedies of mining effluents, on components affecting human healthiness and on environmental results that experience to be taken into consideration through the mining whilst aiming for sustainable improvement in their undefined. extra regulatory directions and laws correct to the decommissioning of mining websites are reviewed.
Mining undefined, consulting businesses, and governmental enterprises alike will discover a wealth of priceless info during this book.
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Additional info for Environmental Impacts of Mining Activities: Emphasis on Mitigation and Remedial Measures
T,~J Fig. 3. Comparative illustration of mineral dissolution rates at pH 2 in order of decreasing rates I I ~ I I ... I,,"! • 'I! "''','' •• ,"',,! • ",,! lIIel ,' .... , '''''1 'Ii ... , i • 'iii, I dolomite PI. nd. biotlle PI. (A"oJ augite enstallte PI. ,) PI. till" ......... t. I 'ttllt" "waf I t .. '" .. ' .... , . . , " ' . . ,," .. D. Paktunc 30 tion of wollastonite, others are common rock forming minerals. According to Lapakko (1988), rapid acid consumption in Duluth waste rock was probably due to the dissolution of plagioclase, olivine and pyroxene.
V c 40 'E 20 O~ o __ ~ __- L_ _ _ _L -_ _ 500 ~ _ _- L_ _ _ _L -_ _ 1000 1500 ~ _ _- L_ _ _ _L -_ _ 2000 ~ __ ~ 2500 time (days) Fig. 5. Particle size effect on dissolution. Simulation carried out for plagioclase (Anso) at time intervals of 20 days and the surface roughness of 1. 00 • 10-13 mol cm-2 S-1 Oxidation and dissolution reactions involving 20% pyrite, 10% olivine, 20% Ca-rich plagioclase (Anso)' 20% diopside,and 30% chlorite with an average particle size of 50 Jlm were simulated at short time intervals.
In the case of the proposed new approach, the net neutralizing potential will be: NNP=BNP-BAP. Assessment of neutralization potentials can also be made on graphs such as the one given on Fig. 1 where one axis is represented by pyrite abundances in wt% and the other by carbonate mineral abundances. Data points plotted on the right sides of lines representing NNP values of 0 are considered to be acid producing. NNP values increase to the left away from the "0" lines. Such graphs can also be used to estimate the amount of various neutralizing minerals required to neutralize a given concentration of sulfide.
Environmental Impacts of Mining Activities: Emphasis on Mitigation and Remedial Measures by Ulrich Förstner (auth.), Dr. José M. Azcue (eds.)