Conclusions
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1.
Thermodynamic calculations show that the interactions of most of the minerals considered in this review with sulfuric acid, should result in a significant heat release, which in the first instance is related to the oxidation of the sulfides.
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2.
The lower the Me/S ratio in the sulfide, the greater the heat effect from the oxidation of 1 g of sulfide. At the same time, calculations of the equivalent unit show that for certain exceptions (covellite) the value of ΔQ (kcal/g·at·S) is approximately constant at 215±17 kcal.
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3.
The main component of the heat effect in the reaction of waste slag with sulfuric acid is determined (from experimental results) by the reaction of the nickel-containing minerals; with refractory copper minerals, primarily by the oxidation of the iron-containing sulfides (faster than pyrrhotite) and partly by the oxidation of the nickel-containing components. Sulfides of copper in this case are virtually undissolved.
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4.
On the previous assumptions, the provisional temperature effect of the process, based on the experimental data, can raise the temperature of slag and copper ores up to 100°C and 480°C respectively.
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 90–97, May–June, 1991.
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Pantsurkina, T.K. Possible heat effects during chemical decomposition and geotechnological leaching of sulfide ores and intermediate products. Soviet Mining Science 27, 251–257 (1991). https://doi.org/10.1007/BF02500905
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DOI: https://doi.org/10.1007/BF02500905