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.

For steel castings with complex structures, manual coating of chromium ore sand on the surface of the castings can greatly improve the accuracy and surface quality of the workpiece. For example, for large cylinder castings with complex structures, use alkali phenolic resin no-bake sand technology. In this process, mix the resin with chromite granule AFS50-55. It can reduce sand sticking and cracks in the castings, and achieve ideal application results.

Chromite sand is a non-metallic mineral product with an iron content of about 25%. The main component is chromium oxide. Chromite sand has the characteristics of high sintering temperature and strong thermal conductivity. Therefore, chromite sand can be used as chilling sand in complex castings that are difficult to shrink, or in the flow channels and hot spots inside castings. Chromite sand working as chilling sand can shorten the cooling time of castings. In the meantime, it can intervene in the cooling sequence between different parts of castings. Especially for large thick wall steel castings and ball-milled cast iron castings, chromite sand improves the density and mechanical properties of castings.

Magnesium-based castables have good slag resistance and corrosion resistance to molten steel. It is usually used in key parts such as slag lines of high-grade steel ladles. However, magnesium sand itself has a thermal expansion coefficient of up to, poor thermal shock resistance, and low anti-stripping ability. Chromite sand AFS40-45 and chromite powder 200 # fine powders are usually added as auxiliary materials in magnesium chromium castables to improve the thermal shock resistance and service life of magnesium-based refractory materials.