At present, the hollow glass beads are sorted from fly ash at home and abroad, which can be roughly divided into two methods. One is to use a dry method to sort hollow microbeads; the other is to use a wet method to sort hollow glass microbeads. The specific adoption method can be determined according to the actual situation.
In China, the dry mechanical sorting method is adopted, and there is a sorting hollow glass bead equipment of gravity separation sieve system, which can process 30t fly ash daily. This set of sorting process includes the selection of hollow beads and can select a variety of particle sizes of iron, carbon, and hollow glass beads.
The hollow glass beads sorting device consists of three main parts, namely a sorter, a separator, and a collector.
The separator is a gravity separation method. The separator is composed of three sedimentation boxes of different sizes. At the lower part of each sedimentation box, there is a discharge device. When the airflow containing fly ash enters through the air inlet pipe In the settlement tank, due to the increase of the cross-section of the airflow channel, the gas flow rate rapidly decreases, and the fly ash is gradually reduced by the gravity itself. According to the principle of an equal drop, heavier coarse particles, honeycomb glass Most of the quartz, mullite, solid beads, iron beads, and large carbon particles are settled in the separator. There are also some small hollow glass microbeads, ultrafine microbeads, etc. that enter the separator with the airflow.
The separator uses the inertial centrifugal force acting on the particles during the rotation of the airflow to separate the particles from the airflow. The main form of the separator is a cyclone separator group. The small hollow microbeads passing down the channel of the subsidence box enter the separator with the airflow. After the separation of the two-stage cyclone separator group, most of the small hollow microbeads can be separated. Come out, the very small amount of ultrafine beads left with the airflow and finally enter the collector.
The collector is at the end of the sorting device. It is both a purification treatment device and a collector for recovering ultrafine beads. The process uses a pulse bag collector, which can collect most of the ultrafine beads not selected by the separator.