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فرآیندهای استخراج معادن گرافیت
6.2.2 Solvent extraction processes. Solvent extraction processes are those processes in which coal is mixed with a solvent ( donor solvent) that is capable of providing atomic or molecular hydrogen to the system at temperatures up to 500°C (930°F) and pressures up to 5000 psi. High-temperature solvent extraction processes of coal have been ...
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