A Physicochemical Study of the Black Cyanide Process

Autor:	C. A. Pickles, Jim M. Toguri, R. A. Bergman
Rok vydání:	2002
Předmět:	Reaction mechanism Gold cyanidation Chemistry Calcium carbide Sodium Inorganic chemistry Metals and Alloys Calcium cyanamide chemistry.chemical_element Industrial and Manufacturing Engineering Gibbs free energy chemistry.chemical_compound symbols.namesake symbols Calcium cyanide Carbon
Zdroj:	Canadian Metallurgical Quarterly. 41:299-308
ISSN:	1879-1395 0008-4433
DOI:	10.1179/cmq.2002.41.3.299
Popis:	Metallurgical grade calcium cyanide is produced by the black cyanide process. In this process, calcium cyanamide which contains free carbon is fused with sodium chloride and a small amount of calcium carbide in an arc furnace to form calcium cyanide according to the following overall reactionCaCN2 + CNaCl = Ca(CN)2 Despite considerable research, the actual reaction mechanism and the thermodynamics of the process are still not completely understood.In the present research, equilibrium experiments were performed at various temperatures and the standard free energy of the formation of calcium cyanide from calcium cyanamide and carbon was determined to beΔG° = 117.6 – 0.0929 T (kJ/mole) 1400 K < T
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e25c791e1836e44f274a9fb49bc5b75b https://doi.org/10.1179/cmq.2002.41.3.299 Zobrazit plný text záznamu