Abrasive Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. All species of garnets possess similar physical properties and crystal forms but differ in chemical composition. The different species are pyrope, almandine, spessartine, grossular (varieties of which are hessonite or cinnamon-stone and tsavorite), uvarovite and andradite. The garnets make up two solid solution series: pyrope-almandine-spessartine and uvarovite-grossular-andradite.
1) Used in non-skid surfaces and heavily as a semi-precious stone
2) Garnet sand is a good abrasive and a common replacement for silica sand in sandblasting. Alluvial garnet grains which are rounder are more suitable for such blasting treatments. Mixed with very high-pressure water, garnet is used to cut steel and other materials in water jets. For waterjet cutting, garnet extracted from hard rock is suitable since it is more angular in form, therefore more efficient in cutting.
3) Garnet paper is favored by cabinetmakers for finishing bare wood.
4) Garnet sand is also used for water filtration media.
5) As an abrasive garnet can be broadly divided into two categories, blasting grade and water jet grade. The garnet, as it is mined and collected, is crushed to finer grains; all pieces which are larger than 60 mesh (250 micrometres) are normally used for sand blasting. The pieces between 60 mesh (250 micrometres) and 200 mesh (74 micrometres) are normally used for water jet cutting. The remaining garnet pieces that are finer than 200 mesh (74 micrometres) are used for glass polishing and lapping. Regardless of the application, the larger grain sizes are used for faster work and the smaller ones are used for finer finishes.
Various industrial use of Abrasive Garnet:-
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