Powder Surface Coating Production

Continuous Process

1.Classic Process: ( used by world-famous mineral processing factory)

Process Flowsheet: Double Pin Mill + Dispersion Machine

2.Standard Process (Recommended by world-famous equipment company)

Process Flowsheet: Double Pin Mill Coating Process

3.Simple Process (Popular in China)

a. Three-roller Continuous Coating Process

Note: the data above is on the base of GCC coating.

b. Process Flowsheet: Turbo Mill Coating Process

Note: the data above is on the base of GCC coating.

Batch Process

High-speed Mixer + Classifier (Or Mixer) Process

Process Features

♦ Process: raw material would be dosed into high-speed mixer or continuous coating machine, mixed and heated (moisture < 0.3%). Coating agent would be added in liquid or after atomization. The material and coating agent get mixed in high-speed mixing. Coated powder would be sent to classifier to remove big particles.

♦ The choice of coating agent and dosage depend on product character, fineness (or specific surface area) and product application. For example of kaolin, for 20-45micron powder, the dosage should be 0.3%-0.5%; for 5-20micron powder, the dosage should be 0.5%-0.8%; for 2-5micron powder, the dosage should be 0.8%-1.0%.

♦ The temperature and time of coating is adjustable, and recipe can be applied in wide cases.

♦ In high-speed movement, material would be heated and coated with coating agent, which make material heated evenly and also improve coating rate. The dosage of coating agent reduced, and coating cost reduce.

♦ Classifier connected with coating machine can remove aggregate from coating effectively, and improve coated product quality and ensure performance of coated product.

♦ The inside of machine would be protected for wear resistance, which improve life time and also ensure purity.

Applications

Calcined kaolin, GCC, quartz powder, talc, wollastonite, PCC, white carbon black, alumina, magesite, magnesium hydroxide.

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