Preparation method of calcium borate
Mixing; Mix boron carbide and calcium-containing raw materials in proportion, and various conventional mixing equipment can be used for the mixing process. The mixing time is determined based on the number of raw materials, generally not less than 30-60 minutes. The boron carbide can be commercially available abrasive grade boron carbide. The calcium-containing raw material can be at least one of calcium oxide, calcium hydroxide, calcium carbonate, calcium bicarbonate, and calcium oxalate, with a particle size specification of not more than 325 meshes and a purity of not less than 97%. Boron carbide is a product with a particle size range of 25 to 325 meshes and a purity of not less than 95%. According to the actual situation, an activator can also be added to the mixture, with a purity of not less than 99% and a particle size of not more than 352 meshes. The activator can be carbon powder and boron, and the amount used should not exceed 5-8% of the total amount of raw materials. When using carbon powder as an activator, graphite, activated carbon, or other carbon powder can be used. In this embodiment, the weight ratios of each raw material are 51-55 parts boron carbide, 38-49 parts calcium-containing raw material, and 0-25 parts active agent. Two 、 Compression molding: To facilitate the smooth discharge of the gas generated during the reaction process, the mixed raw materials can be pressed into a shaped block through a mold and press. The specific size can be determined based on subsequent sintering equipment, generally not greater than 100 × one hundred × 100mm square or cylindrical body with a hole in the middle. 3、 Sintering in a vacuum or inert gas environment; The mixture is subjected to high-temperature sintering reactions in a vacuum or inert gas environment. The sintering equipment can be various vacuum sintering equipment such as an induction furnace or a resistance furnace, and a certain degree of vacuum must be ensured before and during sintering to facilitate the timely discharge of air and gases generated by the reaction. The sintering temperature is 1650-2000 ℃, and the sintering time is 5-8 hours. 4、 Subsequent processing of products; After simply dispersing the material prepared in step 3, the calcium borate product can be obtained by sieving. If necessary, the prepared product can be further washed and graded to facilitate obtaining calcium borate products with better purity and particle size. If you are looking for high quality, high purity and cost-effective copper oxide, or if you require the latest price of copper oxide, please feel free to email contact mis-asia.