S. M. Javad Koleini; M. Abdollahy; M. Nasrabadi
Abstract
In this paper, a study on efficiency increment (operation efficiency) of Kahnooj titanium pilot plant electrical roll separator with optimization of variable and effective parameters (crona voltage intensity, feed temperature and size distribution, rolls speed, ...
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In this paper, a study on efficiency increment (operation efficiency) of Kahnooj titanium pilot plant electrical roll separator with optimization of variable and effective parameters (crona voltage intensity, feed temperature and size distribution, rolls speed, crona electrodes position and splitter position) on operation efficiency is investigated and obtained results are presented. To achieve this aim, parameters were classified and then tests designed with Taguchi method. Feed size distribution tests in laboratory scale and the other tests in pilot plant scale were performed. Optimized values of crona intensity voltage, feed temperature, rolls speed was found to be 22 kv, 109, 154 rpm. However, the optimum position of crona electrodes, the first, second and third splitters were obtained to be 6, 8, 10 and 10 cm. In the position of optimum values, operation efficiency was increased from 35.9% to 46.1%. Moreover, operation efficiency in laboratory scale with d80 of 259 microns feed was maximized and operation efficiency of 46.0% obtained.
M. Abdollahy; A. Raissi; H. Naderi
Abstract
An investigation on beneficiation of Lakhshak antimony ore was carried out using flotation methods. The grade of antimony in representative sample was 17.23%. The most important minerals were stibnite, quartz and pyrite and the degree of liberation of stibnite was found to be 700 micrometer. The raw ...
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An investigation on beneficiation of Lakhshak antimony ore was carried out using flotation methods. The grade of antimony in representative sample was 17.23%. The most important minerals were stibnite, quartz and pyrite and the degree of liberation of stibnite was found to be 700 micrometer. The raw material was divided into three size fractions and beneficiation of fine size fraction (-210+38 m) was floated. The grade of mentioned fraction was 20.50 %. Taguchi method was used in flotation tests and optimum conditions were determined as follows: CuSO4 (1700g/t) as an activator, potassium etyle xanthate (900 g/t) as a collector, MIBC as a frother, pulp density 22% and grain size -150+38 m. All the experiments were carried out at pH = 6.8. As a result the grade and recovery of antimony was obtained 38% (Sb) and 91% respectively.