Yazar "Kumar, P. S." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Flotation performance analysis on coal washery rejects
    (Keai Publishing Ltd, 2021) Kumar, P. S.; Sivrikaya, O.; Pradhan, S.; Nagannor, P. C.
    The coal washery rejects cause major environmental problems in various parts of the globe. Nearly 1 Mt of coal rejects discarded as waste, is accumulated per annum in India, during washing or cleaning of raw coal. Cleaning coal, especially washery rejects, has posed a major challenge to the recovery of fine coal. Froth flotation is a better choice for processing coal washery rejects. In this study, flotation studies are attempted on the coal slurry received from Sudamdih coal washery, Jharkhand, India. A statistical design package (Minitab V17) was used to study the effect of process variables like collector and frother dosages on the responses. Regression equations for froth height, froth density, recovery and ash content of clean coal were developed. The coefficient of correlation (R2) values between the experimental and the predicted values of the flotation responses was found to be greater than 0.98 for all the models. Clean coal product was analyzed for recovery, froth height, and ash content by varying pulp densities. Results show that the coal slurry sample could be evaluated with acceptable recovery via flotation. Clean coal with an ash content of 17.2% is obtained with a 70% recovery from 35.5% ash. The cleaned coal can be used in powder coal-consuming industries. (c) 2021 Sinopec Petroleum Exploration and Production Research Institute. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
  • [ X ]
    Öğe
    The Study of Pelletizing of Mixed Hematite and Magnetite Ores
    (Int Inst Science Sintering (I I S S), 2019) Kumar, P. S.; Ravi, B. P.; Sivrikaya, O.; Nanda, R. K.
    The present study aims to investigate the use of mixed hematite and magnetite ores in iron ore pellet production. Pelletizing tests were carried out on the hematite and magnetite premixed pellet feed. Drop number and compressive strength tests for green and dry pellets; porosity, compressive strength and reducibility tests for fired pellets were carried out to determine the influence of mixing ratios of both iron oxides on those pellet properties. Experimental results showed that as the hematite content in the mix pellets is increased, the green drop number decreased from 6.5 to 5.2, the green compressive strength decreased from 1.51 to 1.28 kg/pellet and the dry compressive strength decreased from 2.50 to 1.60 kg/pellet. It was determined that fired compressive strength of mix pellets decreased from 380 to 230 kg/pellet when the hematite content in the mixed pellet is increased. The reducibility of mix pellets had almost the same trend and it was faster up to 40 min reduction time. The results showed that the use of hematite together with magnetite is possible to produce pellets with sufficiently good quality in terms of wet, dry and fired mechanical strengths. The porosity and reducibility values of mix pellets were also found to be adequate to use as feed for the blast furnace.