Abstract
Parvadeh Coal Preparation Plant (CPP) was installed in 2008 for the production of the 750000 TPY of clean coal containing 10.5% ash from the raw feed having 44% ash and mainly coming from the long-wall mine. Three units of high capacity centrifugal separators (Tri-Flo) are used for the preparation of the coal in the size ranges of -50+6 mm and -6+0.5 mm. Tri-Flo separators are operating in double stages, so they can produce three products. The nominal feed capacities of the 700 mm Tri-Flo and each unit of 500 mm Tri-Floes are 120 and 70 TPH respectively. However, due to some of the operating difficulties in the coal mine, the current feed capacities to the separators are changed to 160 and 30 TPH accordingly. In this research, sink-float experiments on the representative samples of the Tri-Flo separators were used for the evaluation and optimization of their performance. The experiments were performed in six different densities. On the basis of the experimental results, the operating Ep (Ecart Probable) value of the 700 mm Tri-Flowas 0.075 which was more than the design figure (0.035). Such a difference was mainly attributed to the changes in the feed characteristics. In the small Tri-Flo separator, Ep values were measured as 0.062 and 0.087 for the size ranges of (-1+0.5 mm) and (-6+1 mm) respectively and were in good agreement with the design criteria. The optimization of the heavy media separation circuit of the plant is underway using the results presented here.
Highlights
The Tabas Coal Preparation Plant (TCPP) is located in 80 Km. south west of Tabas city in Yazd province in Iran
According to the results of sampling and sample characterization in gravity separation circuit of TCPP, the measured values of clean coal yields clean coal ash contents are presented in Table 1 for both of 700 and 500 mm separators
The reasons of the lower product yields achieved in gravity separation circuit of TCPP were identified which was mainly attributed to the low performance of Three units of high capacity centrifugal separators (Tri-Flo) 700 mm and the optimization of the process is underway using the results presented here
Summary
The Tabas Coal Preparation Plant (TCPP) is located in 80 Km. south west of Tabas city in Yazd province in Iran. The nominal feed capacity to the plant is about 1.5 million tons/year of raw coal with the ash content of about 44%. The plant was installed in 2008 for the production of 750000 tons/year of clean coal containing 10.5% ash. Three units of TriFlo separators and six units of flotation columns are the major equipment used for the washing of the coarse and the fine fractions feed materials respectively. The column flotation circuit is used for the preparation of the fine coal fraction of -0.5 mm. In order to achieve the required ash level in the clean coal product of the plant in about 10.5-11%, the ash content of the coarse, small and fine clean coals are designed to be 11-14, 8-11 and 9-10%, respectively
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More From: Research Journal of Applied Sciences, Engineering and Technology
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