Fathi Habashi, Fathi.Habashi@gmn.ulaval.ca Department of Mining, Metallurgical and Materials Engineering, Laval University (Quebec City, Canada) ENERGY ECONOMY IN EXTRACTIVE Осыған орай, энергия көздерін барынша тиімді пайдаланған дұрыс. <...> To this end, the recent trend in metallurgical plants is focussed towards the following goals: increased use of heat recovery systems; increased use of oxygen instead of air; increased use of direct heating systems; improved equipment design; improved process design; improved methods of operation; attempts to economize energy in the aluminum industry. <...> Also, in electric heating the conduction of heat by the immersed electrodes is more effective than by radiation from the roof as in a reverberatory furnace (pic. 21-23). <...> Further, when sulfides are melted in an electric furnace any SO2 formed will be in a high concentration to justify its recovery. <...> Improved equipment design In an attempt to continuously oxidize finely divided sulfide concentrates the multiple hearth furnace was invented towards the end of the 19th century. <...> Many years later, it was discovered that if the intermediate hearths were removed, the productivity of the furnace increased (pic. 24). <...> This paradox is due to the fact that the rate of a solid-gas reaction on the hearth is low and most of the reaction takes place when the sulfide particles descend from one hearth to the next as it becomes completely surrounded by air. <...> As a result, the flash oxidation Горный журнал Казахстана №7’ 2014 Pic. 21. <...> Обогащение полезных ископаемых 19 efficient reactor as compared to the reverberatory furnace since melting of the charge is autogenous (pic. 27). <...> The finely divided sulfide particles ignite by the preheated air and the heat generated as a result of combustion is enough to melt the components of the charge. <...> Energy consumption in copper matte production in a reverberatory furnace is decreased when electric heating is used as compared to burning a carbonaceous fuel. <...> Flash oxidation reactor: co-current flow of sulfide concentrate and preheated air (products are not melted). <...> When the middle hearths were removed from a multiple hearth furnace, the productivity of the furnace increased. reactor was introduced in the 1940's in which the sulfide concentrate was simply <...>