Caustic calcined magnesia 12 calcines magnesia magnesia from magnesite, brucite and magnesium hydroxide extracted from seawater or brine at about 800-1000 (?) C to decompose and discharge CO2 or hydrogen dioxide, which results in light-burned magnesia powder.
Reference Standard Editor
GB 5069 Magnesium Refractories Chemical Analysis Method
General Regulations on Packaging, Marking and Quality Certificate of Metallurgical and Mineral Products GB 5689
Light burnt magnesia powder can be divided into nine grades according to its chemical composition: QM-96, QM-95, QM-94, QM-92, QM-90, QM-87, QM-85, QM-80 and QM-75.
Technical Requirements Editor
Physical and chemical indicators should meet the requirements of Table 1.
Editor of Test Method
5.1 Chemical analysis was carried out according to GB 5069.
5.2 Particle size was determined by international standard sieving test, i.e. 120 meshes and 100 meshes were tested by international standard sieving test with aperture of 0.125 mm and 0.15 mm, respectively.
Editor of Inspection Rules
6.1 The weight of each batch of finished product is less than 120 t.
6.2 Samples for particle size determination should be sampled before group batches and samples for chemical analysis should be sampled after group batches. Samples were taken in small bags (25kg) and in large bags (1000kg).
After fully mixing the obtained particle size samples, the particle size was determined by point sampling of 10-20g. The mixed samples were reduced to 200 g and sent to the laboratory for analysis.
6.3 If a chemical composition is unqualified or abnormal, double quantity of samples will be re-examined in the same batch of products, and the re-examination results will be the final inspection results of the batch of products.