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3D Model of a FEECO Direct-fired Kiln Acid Roasting Once the material has been decrepitated, or converted to beta-phase spodumene (β-form), an additional calcination step is required. The concentrate, now in β-form, is first mixed with sulfuric acid (a step referred to as sulfuric acid digestion) and fed to a separate rotary kiln.
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Rotary kiln. Calcination in a rotary kiln is a direct, long-time calcining process. During the process, the phases of the CaSO 4 x H 2 O system can be optimally adjusted. Rotary kilns are used for the calcining natural gypsum. In this process, pre-crushed natural gypsum is calcined in parallel flow with the flue gas.
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An experimental study of the calcination of limestone has been carried out in a highly instrumented pilot-scale rotary kiln. Local gas, solids, and wall temperatures and pct calcination have been measured under a range of operating conditions to determine the influence of limestone type, feed rate, rotational speed, inclination angle, and particle …
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A detailed heat transfer model of a dry rotary lime kiln was developed, including modeling of the calcination reac-tion, to determine where calcination starts in the kiln, as well as the degree of calcination of the output lime.
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· The majority of industrial calcination processes takes place in rotary kilns. The primary functions of a rotary kiln are to supply enough heat to raise the solids to reaction temperatures and to promote an efficient mixing of these solids in order to ensure uniformity of heat transfer.
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· Gürtürk and Oztop [11] carried out an exergoeconomic analysis of a rotary kiln used for plaster production and present several solutions for rotary kiln to decrease the cost of plaster production.
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This paper presents the one dimensional modeling of rotary kilns used for energy intensive production pro-cesses. Raw material is fed into an inclined rotating kiln and heated by counter current gas flow.
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Custom rotary kilns, batch- and pilot-scale testing, and parts & service support from the industry's leading thermal processing expert
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· Abstract In this paper, thermal energy analysis of three zones of a lime production process, which are preheater, rotary kiln and cooler, is performed.
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· In this study, the CFD analysis of the rotary kiln is carried out for examining effects of various parameters on energy consumption and efficiency of the rotary kiln. The flue gas recirculation using in many applications is a useful method for combusting of fuel unburned in the flue gas. Also, effects of flue gas recirculation on the combusting of fuel, …
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A particular feature of stucco plaster produced in the rotary kiln is its high productive capacity. A smaller gauging quantity is required with rotary kiln plaster in order to obtain the same consistency, as compared with stucco plaster calcined in the gypsum kettle.
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