In order to protect human health and the environment, many industrial countries have banned the use of crushed silica sand due to various environmental regulations restricting the application of other abrasives. Therefore, in recent years, the amount of garnet sand used for sandblasting has increased significantly worldwide to replace the previously used metal ballast (copper ore sand), river sand, quartz sand, etc. As a dust-free sandblasting abrasive, garnet sand not only has the characteristics of high quality and low price, but also avoids silicosis caused by free silicon and some cancers caused by toxic heavy metals, and can be recycled and reused to reduce costs. Pure, chemical-free and harmless garnet sand offers distinct advantages:
1. The texture is hard, the Mohs hardness is above 7.1, and the hardness of the hardest iron-aluminum garnet sand is 7.5-8. The processed RZG dust-free garnet abrasive is harder than the commonly used sandblasting materials such as quartz sand, sea sand and river sand. It can go deep into holes and uneven parts for cleaning, and thoroughly remove scale, rust, soluble salt and other dirt. The sandblasted surface has no inserts, no bad protrusions and pits, easily obtains the Sa3 blasting grade, the surface roughness can reach 30-80μm, the coating adhesion is stronger, and the coating service life is longer.
2. Since the garnet is an equiaxed crystal and has no cleavage itself, it is easy to form cubic particles with edges and corners after sandblasting, and the sandblasting effect is better. Due to the high hardness, an ideal angular rough surface can be produced on the cleaned metal surface, which increases the surface area of the metal, improves the bonding force of the interface, and significantly enhances the bonding force between corrosion-resistant materials. Protective coatings and metal surfaces. Improve the adhesion of the coating to the metal surface.
3. The density of garnet dust-free sandblasting abrasive is relatively high, generally around 4g/cm³, with strong impact force, which can better clean the metal surface.
4. Garnet dust-free sandblasting abrasive has high strength, and it is not easy to break the metal surface when spraying. More than 10-20 times. It is several times of silica sand (sea sand or river sand) and quartz sand, and the one-time use cost is relatively low.
5. Due to the large specific gravity of garnet sand, 4.0-4.2, the settling speed is fast, so there is less dust in the sandblasting process. After many washings in the production process, the dust content is extremely low, and the operating environment is better than quartz sand.
