(1) Wet gunning, generally only thin layer repair can be carried out. According to the gunning material state spraying method, it can be divided into three kinds: gunning material converter magnesia carbon brick

(2) Dry gunning (also known as semi dry gunning), which can be used for thick layer gunning, is the most widely used.

(3) Flame gunning can obtain dense gunning layer with high bonding strength, erosion resistance erosion resistance.

According to the status of receiving spraying materials on the working face, it can be divided into:

(1) There are three kinds of molten material spraying methods: flame spraying method, plasma spraying method slag splashing method. [1]

(2) The cold material injection method can be divided into five types: slurry injection method, dry spray method, semi wet spray method ( damp spray method), mixed spray method wet spray method. Gunning material, magnesium ball, magnesia brick factory, magnesia carbon brick factory

Particle size composition

The particle size composition limit size of gunning material should be determined according to the structure of gunning machine, thickness of gunning layer different gunning methods. The improper selection of particle size unreasonable particle gradation has a great influence on the adhesion of gunning material the density of gunning layer.