The yields and flotation rate constants for the flotation of coal were obtained by fitting a first-order kinetic model (Wills and Finch, 2016), ... Other laboratory studies have investigated the effects of reagents on the flotation of coal, e.g. (Naik et al., 2004, 2005). Results can be difficult to compare because coal feeds are highly ...
A large number of surfactants together with auxiliary additives are used in froth flotation. Herein, we discuss the important surfactants, focusing on the mechanism by which they act in coal flotation processes. Coal and …
Abstract. The processing of low-rank coal is becoming more urgent with depletion of high-rank coal and severe environmental pollution in China. The flotation of low-rank coal …
The effect of the quantity of sodium metasilicate and conditioning time in one set of experiments, and the effect of the solution concentration of sodium metasilicate, added at …
In this paper, the flotation method has been used for the preparation and beneficiation of coal samples. The Plackett–Burman methodology has been applied to design of experiments and this experimental design method is based on Hadamard matrix and ash content and efficiency index have been considered as responses. The operating …
The standard practice on coal in England has been to use cell-to-cell "Sub-A" Flotation Machines of the double overflow type. Several hundred of the large No. 30 cells (100 cu. ft./cell) are in use. Super-charging is not generally used. Flotation is carried out at low solids, usually under 10% dilution.
1. Introduction. According to the estimations, while 20–40% of coal produced globally are undergoing physical cleaning processes like heavy media or jigging, 40% of produced coal including fine coal are cleaning by flotation [1], [2].Coal flotation is widely applied in countries such as China, USA, Australia, Canada and India [3].However, fine …
Publish Date: 25 February 2022. Abstract. Low-rank coal has developed surface pores and high content of oxygen-containing functional groups, resulting in unsatisfactory …
As the reserves of high-quality coal resources in China are decreasing, it is imperative to improve the processing and comprehensive utilization of low-rank coal. In this study, NaNO2 was used for the flotation pretreatment test of the low-rank coal obtained from Majialiang, and the mechanism was discussed by contact angle analysis, zeta …
The yield of the clean coal, the combustible material recovery and flotation perfect indicators of the isododecane were higher than those of the dodecane by 3.62, 4.08 and 0.96% respectively under ...
Optimization of coal flotation using statistical technique @article{Naik2004OptimizationOC, title={Optimization of coal flotation using statistical …
Naik, P.K., Reddy, P.S.R., and Misra, ... A parametric study has been carried out on effects of operating variables in a bench scale column flotation cell using coal as feed. Due to evaluation of ...
Table of Contents. A unique collector dispersion techniques was developed and used to improve the flotation rate and recovery of coarser and ultrafine coal-rich particles in the froth flotation processes. In this novel collector dispersion method, the collector such as hydrocarbon-oil is gasified and transported by gas phase (air stream) …
The non-coking coal analyzing 34.6 % ash, 26.2 % volatile matter, 1.3 % moisture and 37.9 % fixed carbon could be upgraded to a concentrate/froth of 14.83 % ash at 72.18 % yield by optimizing ...
Some researchers used statistical models for the optimization and prediction of combustible value and recovery of coal flotation concentrate [22-23]. Naik et al. [23] assessed the effect of three most important reagents for coal flotation: sodium silicate, collector (kerosene) and frother (MIBC), using 23 full factorial designs.
Coal flotation experiment was performed by using reagents and ultrasonic wave treatment. ... Interpretation of interaction effects and optimization of reagent dosages for fine coal flotation. P. Naik P. Reddy V. N. Misra. Chemistry, Environmental Science. 2005; 84. Save. Improved flotation of arsenopyrite by ultrasonic pretreatment.
here, γ is the yield of clean coal (%), M c is the weight of clean coal (g), and M t is the weight of the tailings (g). 2.2.2 Flotation Experiments in Inorganic Salt Solutions. Before studying the effect of monovalent cations on LRC flotation, the optimal collector dosage was determined from the flotation results obtained in deionized water (see …
Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with each other and with other species such as the molecules of a promoting reagent and dissolved ions in water. The physical and chemical interactions determine the outcome of the flotation process.
The Box–Behnken experimental design and response surface methodology were applied for modeling the influence of some variables on the performance of coal flotation.
The effect of three most important reagents for coal flotation namely sodium meta silicate, collector (kerosene) and frother (MIBC) was studied using 2 3 full factorial design. The regression models were developed using factorial experiment data to quantify the effect of sodium meta silicate, collector and frother and to predict grade and recovery …
Collectorless flotation tests were carried out with process water for coal A. Flotation tests with diesel as collector at 50 ppm were carried out with simulated process water (0.03 M NaCl solution ...
The development of coal flotation using a modifier is considered. The modifier considered is a petrochemical product: sodium μ-iso-nonylphenoxyethylene carbonate (Sinterol). Its molecules contain an anionic–cationic structure with the general formula: H19C9–C6H4–O(C2H4O)nCOONa. In studying the influence of the modifier …
Pradyumn a K. Naik, P.S.R. Reddy, Vi bhuti N. Misra 2004, "Optimization of coal flotation usi ng statistical technique Fuel Processing Technology 85 (2004) 1473 – 1485. 12.
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 …
Traditional non-polar oil collectors cannot achieve high recovery of low-rank coal because of the presence of oxygen-containing groups at coal surface. In this study, a new mixture of fossil oil and oxygen containing compound (FO) was used to enhance low-rank coal flotation compared with that using traditional collector, diesel oil.
The nature of interaction between coal surface and collector molecule affects the yield of fine coal flotation. The interaction depends on coal surface characteristics and collector polarity as well as collector size. In this work, a detail understanding on the interaction nature of nonpolar such as dodecane (C1) and polar …
In a study on fine coal flotation, coal recovery increased when alkane oil was emulsified with a non-ionic surfactant, compared with an anionic or cationic surfactant; ... Naik et al., (2003) reported that an overdose of kerosene can lead to reduced selectivity, resulting from the collection of middlings and entrainment of gangue.
Naik et al. [18] carried out a 2 5 factorial design to study the effect of diesel oil, pH, MIBC, particle size and sodium silicate on flotation of a low-rank non-coking coal. They found that the influence of particle size was relatively more significant than those of various reagents among which the collector had the highest influence.
coals below 500 µm. In the study, the flotation column and Jameson cell performances for three different. particle sizes (-500+300, - 300+212 and - 212+106 μm) were compared. For the first time ...
The flotation recovery of long flame coal could be increased when long flame coal was either pretreated or conditioned with Tween 60 in a flotation cell for a period before the addition of collector.
In the same flotation conditions, the clean coal yield, the combustible material recovery and the flotation perfect index by the isododecane flotation were higher than those by the dodecane by 3.62, 4.08 and 0.96% respectively, and the ash content was also higher than that by the dodecane by 0.91%, so the collecting ability of the isoparaffin ...
As shown in Fig. 1, the d80 of the flotation coal samples was 150 μm. The proximate and ultimate analyses are shown in Table 1. The carbon content (Cdaf) and ash content (Aad) was 77.48% and 5.07%, respectively. And the oxygen content (Odaf) and hydrogen content (Hdaf) was 16.07% and 5.02%, respectively, which accorded with the …
Pradyumna K. Naik. PALLI SITA RAMA REDDY. CSIR-Institute of Minerals and Materials Technology. Vibhuti N. Misra. Request full-text. Abstract. The effect of …
Effect of sodium metasilicate on natural flotability of coal Effect of sodium metasilicate on natural flotability of coal Naik, Pradyumna; Reddy, P. 00:00:00 The effect of the quantity of sodium metasilicate and conditioning time in one set of experiments, and the effect of the solution concentration of sodium metasilicate, added at …
@article{Naik2005InterpretationOI, title={Interpretation of interaction effects and optimization of reagent dosages for fine coal flotation}, author={Pradyumna K. Naik …
A comprehensive analysis of China's coal storage, coal quality characteristics, consumption status, and other factors shows that low-rank coal will become the focus of China's coal development and utilization in the future. 1,2 For the treatment of low-rank coal, flotation is the most widely used separation method. 3 As is known …
In this study, collector dosage, frother dosage, solid ratio and air flow rate that can be effective parameters on the combustible recovery and ash content of clean coal and their interactions in flotation are described with a mathematical model by using statistical design method. The test results have shown that both models obtained for ash content …
The selection of the collector is an important part of the flotation process and the oily collector is a common flotation collector used in low-rank coal flotation [6,7]. Show abstract Low-rank coal is difficult to float using oily collectors due to the rich oxygen-containing functional groups on the surface.
New Delhi, (1982) c2.1 c2.12. [14] MOHANTY M K, HONAKAR H Q. Performance optimization of Jameson flotation technology for fine coal recovery [J]. Miner Eng, 1999, 12: 367 381. [15] NAIK P K, SUKLA L B, DAS S C. Application of statistical design in the leaching study of low grade manganese ore using aqueous sulfur dioxide[J].
The effect of the quantity of sodium metasilicate and conditioning time in one set of experiments, and the effect of the solution concentration of sodium metasilicate, added at the same dosage and conditioning time to coal slurry, on flotability of a typical Indian coal in another set of experiments are studied. Two sets of 32 full factorial experiments are …
