Influence of high-pressure grinding rolls on physical properties and impact breakage behavior of coarsely sized cement clinker

Date

2016-01-01

Author

Camalan, Mahmut
Onal, Mehmet Ali Recai

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

134
views

0
downloads

High-pressure grinding rolls (HPGR) are widely used in cement clinker grinding prior to ball milling. The efficiency of HPGR was previously related to two capabilities: (a) efficient stressing mechanism and (b) weakening of particles which lead to finer product sizes after subsequent ball milling. This study aimed to investigate the influence of HPGR on the impact breakage behavior of coarsely sized cement clinker. Drop weight tests were conducted on three single-size samples from both feed and product streams of an industrial HPGR, so as to obtain impact breakage parameters: breakage probability and impact breakage functions. Radiographic, Vickers micro-hardness, BET, SEM, XRD, XRF, and image processing methods were utilized to explain the variations in impact breakage parameters. The product samples were found to have less porosity than feed samples but they contained HPGR-induced micro-cracks. Those cracks are believed to be responsible for lower hardness and higher breakage probability of product particles than of feed ones under impact. However, fragments generated from the product samples by drop weight tests were coarser than those generated from feed samples. That was due to elimination of pores by HPGR action. At excess energy levels, both samples were broken to same extent regardless of structural differences.

Subject Keywords

Portland cement clinker, Impact breakage parameters, High-pressure grinding rolls, Drop weight test, Fragmentation

URI

https://hdl.handle.net/11511/56882

Journal

PARTICULATE SCIENCE AND TECHNOLOGY

DOI

https://doi.org/10.1080/02726351.2015.1075636

Collections

Department of Mining Engineering, Article

Suggestions

OpenMETU
Core

Ball-Mill Grinding Kinetics of Cement Clinker Comminuted in the High-Pressure Roll Mill Camalan, Mahmut; Hoşten, Çetin (2015-09-03) The use of high-pressure grinding rolls (HPGR) prior to ball mills has become a common practice in cement clinker grinding due to significant energy savings in comparison to ball milling alone. The energy savings has been attributed to higher energy efficiency of HPGR at low reduction ratios, smaller particle top sizes in the ball mill feed, and the weakening of particles resulting from compression of particle bed by HPGR. This study attempts to show how the weakening effect changes the kinetic breakage par...
Influence of slag fineness on the strength and heat evolution of multiple-clinker blended cements Erdoğan, Sinan Turhan (2017-11-30) Three clinkers and a blast furnace slag, ground separately, were combined to produce 27 cements. Each cement consisted of 35% fine (similar to 6000 cm(2)/g), 25% intermediate (similar to 4000 cm(2)/g), and 40% coarse (similar to 2500 cm(2)/g) particles. Slag made up the fine or intermediate particles in the blended cements, clinkers making up the remainder. Compressive strength was measured up to 28 d on mortars and heat evolution was investigated up to 48 h using isothermal calorimetry. Portland cements wi...
An industrial comparative study of cement clinker grinding systems regarding the specific energy consumption and cement properties Hoşten, Çetin; Fidan, Berkan (2012-05-01) This paper is concerned with a comparative analysis of modern cement grinding systems, namely, combined grinding (Comflex (R)), high-pressure roll mill (HPRM) grinding, and horizontal roller mill (Horomill (R)) grinding. Cement production trials were run with these grinding systems in the same cement plant by using the same clinker/gypsum feed to produce cements of almost identical chemical compositions and similar Blaine fineness values of about 3600 cm(2)/g. The grinding systems were compared in terms of ...
Effect of Residual Stresses on the Structural Safety of the Butt Welded Structural Steels Batıgün, Caner; Gür, Cemil Hakan (null; 2018-12-26) Butt welded seams are widely used in steel constructions. The welding conditions, bevel geometry and the weld sequence are decided by considering the material thickness, welding process and the accessibility. Welding operation generates a residual stress state in the joint area depending on the geometry or path of the weld, initial temperature of the material, heat input, clamping conditions, cooling conditions, phase transformations, etc. Design of a product ignoring residual stresses always involves risks...
Analysis of tube upsetting Tüzün, Aydın; Darendeliler, Haluk; Department of Mechanical Engineering (2004) Producing axi-symmetrical parts with holes from tubular stock by tube upsetting is a frequently used technique in industry. There are basically four types of tube upsetting process; external, internal, simultaneous internal and external upsetting, and expanding of tube. In general, tubular parts require more than one upsetting stage. In industry, generally trial-error methods, which require lots of time and effort depending on experience, are used for the design of stages. Wrong design causes failures durin...

Citation Formats

M. Camalan and M. A. R. Onal, “Influence of high-pressure grinding rolls on physical properties and impact breakage behavior of coarsely sized cement clinker,” PARTICULATE SCIENCE AND TECHNOLOGY, pp. 278–288, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56882.