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　 (1) The color of the ore sand is comparable to that of the pomegranate sand. The material itself is purple or reddish brown. If it is found green, grayish white, black matter, it is an impurity. The amount of impurities means the purity of the garnet sand abrasive. At present, the most common impurities in domestic pomegranate sand abrasives are omphacite, chlorite, feldspar (gray white), mica flakes (black) and ilmenite (black).
(2) Comparison of washing effect Because the domestic pomegranate sand abrasive is a transparent glass, take 30g of pomegranate sand abrasive sample and add 80ml of water, which is roughly the sampling volume: the ratio of water addition = 1:4, after mixing See if the water is turbid. If it is slightly white, it means that the abrasive of the garnet sand is low in mud and has a water washing process; if the aqueous solution is grayish, it means that the mud content is slightly higher, the washing process is not very thorough; if the aqueous solution is yellow or very turbid, it means The washing process is poor or not washed at all.
It is quite obvious that the washing process of the garnet sand in the bottle on the left side is more in place.
In addition, it can also be tested by the actual use effect:
(3) Comparison of surface effects of blasting (sand blasting effect)
If there are too many impurities, the surface of the blasting surface will have different spots or color points, and the surface will not be clean;
The roughness of the surface of the blasting surface will be uneven. If the anti-corrosion coating is needed in the later stage, the adhesion of the coating will be uneven, which will easily lead to the falling of the coating and accelerate the corrosion and oxidation of the product.
Domestic poor quality garnet sand blasting effect diagram (1) The garnet sand content is too low, resulting in insufficient impact strength, the rust point of the steel plate can not be cleaned, and the surface roughness of the blasted steel plate can not meet the requirements.
(2) The content of garnet sand is too low, the mud content is high, and there are other large amounts of impurities. After the steel plate is sprayed, the powder and mud of the impurities will adhere to the surface of the steel plate with impact, leaving different sizes on the surface of the steel plate. stains, abrasive blasting cleanliness difference <br> <br> more than 2 points, it will increase the cost of processes and post-processing
　 (4) Waterjet sand cutting surface (water cutting process effect)
If there are too many impurities, the hardness of the material medium will be high and low, which will easily make the cutting surface rough. Especially for brittle materials such as glass, the damage of the cutting surface is more obvious. The glass cut surface will have blasting or even chipping, and some impurities will be crushed. As the impact of the cut fuses to the glass surface, it is very difficult to remove.
The above is a cross-sectional view of the cross-section of the high-purity garnet sand of India and the low-purity garnet sand produced in China. It is very obvious that the cross-section of the steel plate with the inferior garnet sand cutting abrasive on the right side is very rough.