1. Rotarykiln or horizontal kiln, which has a horizontal shaft with a slightinclination, and can make rotational motion;

2. Shaftkiln or vertical kiln, it is vertical and can’t rotate.

Different people had different views on thetwo kind of lime kiln: some people think that vertical kiln covers a small areaand costs lower on construction investment and running costs; while some peoplethink that the yield of vertical kiln is low and the pollution is serious, somost users still use horizontal kiln as main rotary kiln equipment.

Horizontal kiln has high running stabilitywhen burns lime, and has low requirements on coal quality. What is more, thelarge output, better environmental effect and other advantage of horizontalkiln make it the best kiln for mass lime production.

Compared with vertical kiln, theadvantages of horizontal kiln are as follows:

1. Horizontal kiln can be used to burn small particles of limestone, whileshaft kiln can’t do it.2. The quality of quick lime produced by horizontal kiln is easier to be controlled.3. The weight of horizontal kiln is even without large fluctuations.4. The operation of horizontal kiln is simple, easy to stop and restart.5. The production scale of horizontal kiln is large, can be more than 1000tons/d.6. Due to the large capacity of the horizontal kiln, fewer operators are neededwhen it’s in work.7. The productivity of horizontal kiln is higher under same other conditions.

8. The product quality of horizontal kilnis better than that of vertical kiln.