Modeling and optimization of fine coal beneficiation by hydrocyclone and multi-gravity separation to produce fine lignite clean coal

Abstract

We evaluated the suitability, contribution to the national economy, and environmental impact of hydrocyclone and Multi-Gravity Separation (MGS) processes using fine-sized coal taken from Downloaded by [The University Of Melbourne Libraries] at 22:43 22 June 2016 2 the Soma coal sludge pond. The lignite coal tailings were treated by a two-stage concentration scheme for the recovery of fine clean coal. Pre-enrichment experiment parameters were determined by Taguchi experimental design method, and the results were interpreted by SPSS 15.0 program to evaluate the optimum parameter values. The tailings initially contained 54.82%ash and had a LCV of 2,279 kCal/kg; after hydrocyclone pre-enrichment, the concentrate was 42.60% ash and had a calorific value of 2,573 kcal/kg (55.75% coal yield).After the final enrichment process, the ash of the pre-concentrated coal was decreased to 24.21% and left a clean coal with a base calorific value of 3,226 kcal/kg (36.16% coal yield). The total sulfur of the obtained clean coal was 0.52% and the combustible sulfur rate was 0.10%. To reduce the ash content of the obtained clean coal, a decantation process was performed that decreased the ash

Conventional and recent advances in gravity separation technologies for coal cleaning: A systematic and critical review

“…While the drum is rotating, the centrifugal force from drum rotation affects gravity separation so that coarse particles or high density, high ash content, are spiraled outside and settled on drum surface then slowly swiped up by scrapers to be discharged at the outer end. Meanwhile, the fine or light density particles less affected by centrifugal force, form a flowing film above the heavier seam then is conveyed by the shaking of the drum and continually washing water flow to the lower tilt inner end [ [273] , [274] , [275] ]. MGS was applied for the treatment of ultrafine coal as well as tailing pond deposits [ 276 , 277 ].…”

“…The result showed that drum inclination was determined as a major available on the reduction of ash content and other minor parameters are solid concentration, drum rotation speed, shaking amplitude, wash water rate, and feed rate [ 274 ]. Also, Özbakir et al (2017) proposed a regression model with flow independent inputs (i.e., drum rotation speed, wash water rate, drum inclination, and solid concentration) and two dependent outputs (i.e., ash content and coal yield) variables [ 275 ]. The results showed that ash content and the yield were decreased when lower water flow rate, higher drum rotation speed, higher drum inclination, and solid concentration were used [ 275 ].…”

Arguvan linyitinden kül ve kükürt uzaklaştırılmasında farklı gravite yöntemlerinin etkisinin belirlenmesi

“…As a result, they managed to reduce the ash content from 30.4% to 12%. Özbakir et al (2017) used a combined optimization of hydrocyclone and multi-gravity separation device to remove ash and sulfur from the coal preparation plant tailings [17]. As a result, they managed to reduce the ash content from 54.82% to 24.52%.…”

Modelling of Hard Coal Beneficiation Process Utilising Negative Pressure Pneumatic Separator

“…In order to fully present the capability of the device, the working model needs to be developed. A significant part of the research focused on developing models, be that based on statistical correlations, aerodynamic equations, or computational fluid dynamics (CFD) methods, to fully address the problem of process optimisation and to assess achievable effectiveness of the proposed solutions [36][37][38][39][40].…”