Calcium aluminate powder is a beige powder. The main components are a mixture of calcium aluminate and calcium monoaluminate. Slightly soluble in water, the aqueous solution is alkaline with a pH value of about 11. Calcium aluminate powder has high reactivity with inorganic strong acids and can be initiated at room temperature. And it releases a large amount of heat, heats up quickly, and the dissolution rate of alumina can reach over 90%. Using it as raw material to produce liquid or solid polyaluminum chloride can simplify the process, reduce costs, and improve product quality. It is currently the raw material used by most polyaluminum chloride manufacturers at home and abroad.
Application scope:
Calcium aluminate powder is mainly used in the production of aluminum salts such as polyaluminum chloride, aluminum sulfate, and calcium aluminate. It can also be used for adjusting alkalinity and for refractory materials.
Quality standards:
At present, there is no unified quality standard in China, and its production and inspection are carried out in accordance with our company's ZZGFGS001-2000 standard.
usage method:
Calcium aluminate powder reacts with hydrochloric acid to produce polyaluminum chloride in one step. During production, water is added to the reaction tank and the stirring slurry is activated. Then add hydrochloric acid quantitatively, dilute to the required concentration, and slowly add calcium aluminate powder for reaction. During the reaction process, the temperature inside the pool will gradually increase. When the temperature exceeds 11 ℃, an appropriate amount of water can be added to suppress the reaction and prevent it from overflowing. Add water in small amounts multiple times. Maintain the normal required temperature. After adding calcium aluminate powder, react for another 2 hours. When the pH test is greater than 3, dilute with water to a density of 1.25~1.26. After settling in the sedimentation tank, the upper clear liquid is the liquid product. It can also be dried in a dryer to obtain solid polyaluminum chloride product.
Calcium aluminate powder and calcium aluminate mineral compound as ettringite binder, wherein the calcium aluminate mineral compound contains calcium oxide C and aluminum oxide A, which are soluble and can bind to one or more crystalline and/or amorphous mineral phases in the following ratio: - The effective C/A molar ratio of the calcium aluminate mineral compound is 1.2 to 2.7; -The total weight of available (C+A) phases accounts for at least 30% of the total weight of mineral compounds. The method of using calcium aluminate material. The technical solution is to mix 25-70wt% red mud and 30-75wt% aluminum ash, and add 15-50wt% calcium containing compound or no calcium containing compound. After mixing, the mixture is placed in an electric furnace and melted and reduced at 1400-1800 ℃ for 1-4 hours. After natural cooling, it is crushed and separated to obtain ferrosilicon alloy and calcium aluminate material. The present invention uses aluminum ash and red mud as raw materials, utilizes waste materials, and has a simple process and low cost. The reducing agents used in the reaction process are metallic aluminum and aluminum nitride, which release heat, reduce power consumption, and have no CO2 emissions.
Calcium aluminate powder ※ Performance and characteristics:
Calcium aluminate powder is a gray white powder. The main component is a mixture of calcium aluminate (CaO 2A1203) and calcium monoaluminate (CaO A1203). It is slightly soluble in water, and the aqueous solution is alkaline with a pH value of about 11.
Calcium aluminate powder has high reactivity with inorganic strong acids and can be initiated at room temperature. And it releases a large amount of heat, heats up quickly, and the dissolution rate of alumina can reach over 90%. Using it as raw material to produce liquid or solid polyaluminum chloride can simplify the process, reduce costs, and improve product quality. It is currently the raw material used by most polyaluminum chloride manufacturers at home and abroad.
Application scope:
Calcium aluminate powder is mainly used in the production of aluminum salts such as polyaluminum chloride, aluminum sulfate, and sodium aluminate. It can also be used for adjusting alkalinity and for refractory materials.
Quality standards:
At present, there is no unified quality standard in China, and its production and inspection are carried out in accordance with our company's O/GWDGS001-1999 standard.
usage method:
Calcium aluminate powder reacts with hydrochloric acid to produce polyaluminum chloride in one step. The mixing ratio is calculated according to the following formula:
WHcl=[2 147 (1-B) AAlo, n x 1 304 Acao]. W/AHC
In the formula: WHCl - weight of hydrochloric acid to be added Ke
W - Weight of calcium aluminate powder to be added Kg
B - Expected alkalinity of polyaluminum chloride product%
Aluminum oxide content in Aal2O3 calcium aluminate powder%
Oxidation content% in AcaO calcium aluminate powder
Ahc1- Hydrogen chloride content in hydrochloric acid%
N-dissolution rate%
During production, first add water to the reaction tank and start stirring the slurry. Then add hydrochloric acid in a quantitative amount, dilute to the required concentration, and slowly add calcium aluminate powder for reaction. During the reaction process, the temperature inside the pool will gradually increase. When the temperature exceeds 110 ℃, an appropriate amount of water can be added to suppress the reaction and prevent it from overflowing. Add water in small amounts multiple times to maintain the required temperature. After adding calcium aluminate powder, react for another 2 hours. When the pH test is greater than 3, dilute with water to a density of 1.25-1,26. After settling in the sedimentation tank, the upper clear liquid is the liquid product. It can also be dried in a dryer to obtain solid polyaluminum chloride product.
Transportation, packaging, and storage:
Packaged in plastic woven bags, each bag has a net weight of 50+1kg and should be kept dry, waterproof, and moisture-proof during transportation and storage. If it clumps in the presence of water, it must be treated before use.