Comparison of breakage behavior between the sieving crusher and ordinary teeth roll crushers

Comparison of breakage behavior of coals is conducted between the industrial sieving crusher (SC) and ordinary teeth roll crushers in different breakage flow sheets. Two types of coals, about 10 tons, are used for each comparison, and consumed energy and size distribution of products are analyzed. Due to differences in roll rotation rate and teeth distribution on roll, breakage product of SC shows the lower yield of +50 mm particles and -6 mm fines, and the higher content of -50 + 6 mm progenies. SC also indicates the advantage of saving energy if compared with that of single tooth roll crusher and double teeth roll crusher (DTRC). On the other hand, the combined flow sheet of classification and breakage is compared with the single utilization of a SC. The -50 mm particles in the feed are removed by hand sieving and +50 mm particles are broken by DTRC. As a comparison, raw coal without any pretreatment is fed to a SC. Results indicate that the decrease of coal mass to DTRC can reduce the consumed breakage time and energy, but products of SC have a higher yield of -50 + 6 mm particles. Parallel tests show the small standard deviations. In summary, experimental results of this paper are reliable, and SC shows advantages in breakage efficiency and saving energy, which is a benefit for the breakage of coarse particles.