Lithium slag dryer

1.Product introduction
Lithium slag dryer is the core equipment for dehydration and drying of waste slag ( lithium slag ) produced after lithium extraction from lithium ore such as spodumene and lepidolite. Lithium slag has the characteristics of high initial water content ( usually 25 % ~ 40 % ), fine particle size, high viscosity and strong corrosion. The dryer adopts a three-cylinder or single-cylinder structure. Combined with the high-temperature rapid drying process, the water content of lithium slag can be reduced to less than 8 %. The treated materials can be used in the field of resource utilization such as cement admixtures, concrete admixtures, brick and tile products, and mine filling materials. The equipment has the advantages of high efficiency, energy saving, anti-blocking, wear resistance and corrosion resistance. It is an ideal choice for lithium salt production enterprises and building materials supporting enterprises.
2.Working principle
Wet lithium slag is sent to the feed end of the dryer cylinder through a belt conveyor or a screw feeder. The cylinder is installed at a certain inclination angle ( 3 % ~ 5 % ) and driven by the transmission device to rotate at an appropriate speed. There are a variety of combined lifting plates on the inner wall of the cylinder. The lithium slag is continuously copied and scattered to form a uniform material curtain and increase the contact area with the hot air.
The hot air is produced by a hot blast stove ( which can use natural gas, coal, biomass or waste heat steam as a heat source ) and enters the cylinder from the feed end or the discharge end ( downstream or countercurrent mode ). The hot air conducts strong convective heat transfer with lithium slag, and the water evaporates rapidly. The water vapor produced by evaporation is discharged with the exhaust gas, and it is discharged after treatment by the dust removal system ( cyclone + bag or wet dust removal ). Lithium slag moves along the axial direction in the cylinder and undergoes three stages of preheating, constant speed drying and falling speed drying. Finally, it is discharged from the discharge end to obtain dried qualified lithium slag products.
According to the fine viscosity characteristics of lithium slag, a self-cleaning device and a special lifting plate structure are set up inside the dryer to effectively prevent the material from sticking and blocking, and ensure long-term stable operation.