In the paper, the effects of such four factors as calcination temperature, calcination time, proportion of bentonite and preheating temperature on content of FeO in pellet are studied based on the actual situation of material for the production with belt type pellet firing machine of Baotou Steel. The orthogonal experiment with four factors at four levels is adopted. The experiment results showed that the factors influencing content of FeO in pellet from strong to weak were calcination time, calcination temperature, proportion of bentonite and preheating temperature. It is optimum that calcination temperature is 1 240 ℃, calcination time is 14 min, proportion of bentonite is 2.0% and preheating temperature is 600 ℃ as well as it is the worst that calcination temperature is 1 240 ℃, calcination time is 8 min, proportion of bentonite is 3.0% and preheating temperature is 900 ℃.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |