Spray drying machine for iron oxide yellow

Iron oxide yellow is a kind of heat sensitive material. When it exceeds a certain temperature, it will lose part of crystal water and change its color. The traditional box dryer is a kind of intermittent production equipment, which not only has high labor intensity, but also has low production efficiency. A new spray drying dryer is designed for drying iron oxide yellow. It has the advantages of continuous production, low labor intensity, high thermal efficiency, simple equipment flow and convenient operation and management.

Spray drying machine for iron oxide yellow

Iron oxide yellow, commonly known as iron oxide yellow, is a crystalline mixture of iron oxide. It is widely used in construction, paint, rubber, plastic, stationery and other industries. It is made by oxidizing metal iron in the air.

Iron oxide yellow is a kind of heat sensitive material. When it exceeds a certain temperature, it will lose part of crystal water and change its color. The traditional box dryer is a kind of intermittent production equipment, which not only has high labor intensity, but also has low production efficiency. A new spray drying dryer is designed for drying iron oxide yellow. It has the advantages of continuous production, low labor intensity, high thermal efficiency, simple equipment flow and convenient operation and management.

Process flow chart:

1- gas heater 2- rotary drum vacuum suction and water spray device 3- quantitative feeder 4- screw conveyor 5- external mixing atomizer 6- spray dryer 7- diffusion type separator separator 8- aggregate box 9- star valve 10- bag filter, 11- draught fan, air distributor, separator, dry material reflector

The raw material solution iron oxide yellow is pumped by 2, washed by water spray, scraped off the cleaned filter cake with blowing scraper, and enters into the quantitative feeder 3. Due to the rotation of the paddle, it is pressed into the auger 4. Due to the rotation of the screw conveyor 4, the material is squeezed to the external mixing atomizer 5.

The air is heated to 280-320 degrees by a hot blast stove. Through the air distribution panel 12, the spray dryer 6 with a diameter of 0.8m and a high 5.9m is placed on the air distribution board. A high strength alumina ceramic ball with a diameter of 0.5-2.8mm is placed on the air distribution board. The alumina ball in the fluidized bed is tossed violently due to the rotation of the induced draft fan. The iron yellow paste liquid is atomized and sprayed into the bed by compressed air through the external mixing atomizer, and then heated, pulverized and dried on the separator 13. The dried iron oxide yellow is discharged, and the tail gas is recovered by pulse bag filter 10.

The air inlet temperature of 280-320 ℃ and bed temperature of 95-105 ℃ are selected for the equipment, and the moisture content of finished products is less than 1%.

The sprayer is sprayed into the horizontal direction. The installation height of the sprayer should be higher than that of the static layer 20mm of the ceramic ball. The air nozzle is flat or slightly prominent with the surface.

Operation conditions of fluidization drying technology for iron oxide yellow spray:

Solid content of iron oxide yellow liquid: 12 ± 2G / 100cm3

Solid content of iron oxide yellow filter cake: 30 ± 2G / 100cm3

Mass of alumina inert particles: 150-175kg

Washing water pressure: 0.15Mpa

Sprayer air pressure: 0.08-0.15MPa

Feeding regulating pressure: 100-150v

Inlet air pressure of fluidized bed: 800-1000pa

Drying temperature at inlet of fluidized bed: 280-320 ℃

Drying temperature of fluidized bed: 80-110 ℃

Drying temperature at outlet of fluidized bed: 70-100 ℃

Temperature of bag filter: 60-90 ℃

Main equipment and structure:

The external mixing type air flow atomizer has three head guide thread single port atomizer, the atomizer diameter is 12mm, the screw pitch is 34mm, the atomizer cone angle is 24 ° and the air nozzle cone angle is 83 ° and the atomization angle is 80-110 °.