Affected by the international market, the overseas demand for chromite sand has increased. 200 tons of casting grade 46% chromite sand AFS 45-55 are ready for export.
Moulding Chromite sand is an important refractory material in foundry industry. The high thermal resistance temperature, good thermal conductivity, low expansion coefficient, and excellent melting metal penetrate resistance make it suitable for many casting processes.
Our factory in China produce dry chromite sand by washing, megenatic removal, seiving with AFS fineness standard. Now we have about 20000 Tons of moulding chromite sand for sale every month.
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.
