Energy savings by improved control of the finish grinding process in cement manufacture: Final report, January 1, 1985-December 31, 1986

Technical Report · Sun Mar 01 00:00:00 EST 1987

OSTI ID:6421493

Weiss, S J; Tresouthick, S W

Conventional closed-circuit ball mill systems for the finish grinding of portland cement produces product particle size distributions (PSDs) which indicate poor reduction of topsize and excessive production of fines. Optimization of ball mill systems should improve energy efficiency while meeting or exceeding typical cement performance requirements. Pilot scale continuous grinding systems, including a closed-circuit ball mill with a conventional classifier, a high-efficiency classifier, or a vertical roller mill were used to determine operating conditions and configurations which would lead to narrowing of the cement PSD. Closed-circuit ball mill results suggest that several opportunities exist to increase particle breakage efficiencies while minimizing unnecessary fines generation by means such as: modification of mill recirculation rates, optimal selection of ball size distribution, and use of highly efficient particle size classifiers. Mill system design philosophies common worldwide which favor long mill lengths, fine ball charges, and low circulating loads are called into question. In order to produce cements with acceptable early mortar strengths by sole use of a roller mill, products must be ground to finenesses similar to those of conventional cements.

• Research Organization: Construction Technology Labs., Skokie, IL (USA)
• DOE Contract Number: FC07-82CS40419
• OSTI ID: 6421493
• Report Number(s): DOE/CS/40419-T1; ON: DE87012693
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CEMENT INDUSTRY
ENERGY CONSERVATION
PORTLAND CEMENT
PRODUCTION
GRINDING
MILLING MACHINES
OPTIMIZATION
PARTICLE SIZE
BUILDING MATERIALS
CEMENTS
COMMINUTION
INDUSTRY
MACHINE TOOLS
MACHINING
MATERIALS
SIZE
TOOLS
320303* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Equipment & Processes