Preparation of granular soil conditioner and its disintegration characteristics

The effects of different types of materials，fineness，the mass ratio of phosphate rock powder and zeolite，particle size，and the amount of bentonite and attapulgite on the properties of granulation and disintegration were studied. It was found that the rate of grain increased with the decrease of fineness and content of zeolite. Grinding for 3 h，the rate of grain increased by 14.16% when the mass ratio of phosphate rock powder and zeolite was 1∶1 compared to the ratio of 1∶30，however 1∶30 group had no significant difference with 1∶15 group，only 2.88%； When the mass ratio was 1∶0，the rate of grain increased by 15.16% for grinding 3 h compared to 1 h，but only 1.08% compared to 4 h. When the particle size was 3-5 mm and the mass ratio was 1∶15，the disintegration time of particle was 31 s，which increased by 72.2% when the grinding time changed from 4 h to 1 h. In addition，the particle size of particle also had an impact on the disintegration time，the disintegration time under the same conditions were sorted as follows：5-10 mm group ＞ 3-5 mm group ＞ 1-3 mm group.