Chromite sand AFS 40-50 is a black casting sand with a semi metallic luster. It comes from chrome ore in nature. Chromite sand has a Mohs hardness of 5.5-6.5 and a specific gravity of 4.3-4.8g/cm3. Natural chromite ore is composed of two parts: spinel and gangue, which are usually associated. Spinel is Mg · FeO Al Cr2O3, gangue is serpentinite H4 Fe · Mg3 Si2O9 (hydrated silicon magnesium), and there are also small amounts of magnesium olivine, quartz, green pyroxene and other forms in chromite. The quartz (SiO2) in it is harmful to the chromium ore used in casting and needs to be removed through processing methods.

Molding chromite sand has high mechanical strength and high refractory temperature. It can be recycled and reused in casting processes such as coated sand and self hardening sand.
There are two types of recycling and regeneration of chromite sand in steel casting.

Chromite ore is a type of spinel ore containing chromium oxide, iron oxide, and small amounts of silicon and calcium. After breaking into small particles, it becomes sandy and is also known as chromite sand. Cr2O3 content min 46% chromite sand is for foundry. Due to its high refractory temperature, fast thermal conductivity and cooling rate, solid-state sintering, and low coefficient of expansion, chromite sand is considered a good casting sand and surface sand for steel castings.

Usually, the PH value of foundry chromite sand is measured to determine the acidity and alkalinity of the original sand. The PH value of chromite sand is usually between 7-9. However, The PH value can only reflect the content of acid-base substances that are soluble in water. For insoluble acid-base substances such as calcium carbonate, they can react with acidic substances such as hydrochloric acid. Therefore, the ADV reflects the impurity content in the original sand that is insoluble in water but can react with acid-base substances.

Since the second quarter of 2024, the demand for imported chromium ore sand in South Africa has been increasing, and domestic foundries are facing a shortage of raw materials. In addition, the South African route to Tianjin port is more convenient. Our company has recently built two new plants of chromite sand at Tianjin Port in China to quickly process and produce South African imported chromite sand.

325mesh chromite powder for Embroidered glass beads pigment is a coloring agent for green, coffee, brown, and brown glass. Chromite powder, also known as chrome ore powder, is generally 325 mesh-0. 325 mesh chromite powder is produced from 46% chromium content chromite ore sand through 24-hour ball milling and grinding. 97% of the 325 mesh chromite powder particles are below 45 microns.