The specific gravity of natural chromite ore is generally between 4.0 and 4.8 g/cm³. The specific gravity of foundry chromite sand is higher, and the value of 46% chromite sand is higher than 4.5 g/cm³.
Foundry chromite sand has special requirements for particle size distribution and high requirements for the proportion of each sieve segment. When testing particle size and AFS value, manual seive inspection and automatic seive inspection can be used for testing, and there are certain differences between the two.
Chromite flour 75 μm （200mesh） is a superior refractory mineral for foundry coating and glass & ceramic pigment. It has the following properties
Foundry chromite sand has become a commonly used foundry sand in the fields of machinery and equipment, railway parts, etc. due to its excellent refractory temperature, resistance to steel sand erosion, anti-sticking sand, strong thermal conductivity, and high cost performance. The chromium content of chromite sand for foundry is not less than 46%, and the silicon content is not more than 1%.
Chrome ore foundry sand AFS 45/55 (particle size of about 0.25-0.35mm) is used as casting sand for railway turnout accessories. With its unique physical and chemical properties, it has excellent performance in high temperature stability and resistance to metal penetration.
Chrome powder 325mesh is fine chromite flour with 97% granular smaller than 45um. By milling 46% raw chrome ore sand would get Chrome powder with Cr2O3 45-46%.
