... indirect method and direct method zinc oxide industrial and feed grade indirect method and direct method zinc oxidewe are industrial corporation ... high productivity, both direct and indirect processing method in general grade, Ceramic grade and enamel . We can produce 150mts/15 days, 300mts ... and feed grade80%,85%,90%,92%,95%,96%, 97%,98%,99%,99.5%, 99.7%, 99.8%, 99.9%