Formula: CoC2O4 . 2H2O
light pink crystals, soluble in ammonia, slightly soluble in water and acid.
A raw material for preparing cobalt metal powder and other cobalt salts.
Stored in cool and dry warehouse; Keep away from flame and heat.
|1||Assay (as Co)||31.5 min.||31.0 min.|
|2||Iron (Fe)||0.01 max.||0.01 max.|
|3||Nickel (Ni)||0.2 max.||0.2 max.|
|4||Manganese (Mn)||0.1 max.||0.1 max.|
|5||Pb||0.01 max.||0.01 max.|
25kg net. Double plastic bags lined plastic woven sack.
Cobalt oxalate is used in the preparation of indicators, catalysts and intermediates in organic synthesis.
1) Preparation of tricobalt tetroxide.
Co3O4 powder is widely used in catalysts, pigments, colored glass, magnetic materials and ceramics. In the electronics industry, Co3O4 used in batteries has special requirements on physical indicators, especially particle size composition, distribution and bulk density, in addition to strict requirements on chemical composition. It is generally required that cobalt oxide has a relatively uniform particle size, the typical particle size D50 is 6μm or 10μm, and the requirement for bulk density is 0.7-1.2g/cm3. For large batteries used in power sources, the requirements for particle size and bulk density are more stringent for safety reasons. In addition, Co3O4 is also an excellent catalyst material, such as a catalyst for high-temperature catalytic propane combustion, and high-purity and ultra-fine Co3O4 is an important raw material for manufacturing heat-sensitive and pressure-sensitive electrodes, color TV glass shells, and high-grade blue and white porcelain. The oxidative decomposition reactions of cobalt oxalate mainly include the following types:
When cobalt oxalate is decomposed, the strength and temperature of the oxidizing atmosphere have a great influence on the form of cobalt oxide. There are three forms of cobalt oxide, and their grades are CoO78.65%, Co2O371.03%, and Co3O473.43%. According to thermodynamic calculations, when CoO is oxidized in air at 400-900°C or in oxygen at 300-400°C, Co3O4 can be produced, but only at low temperatures (less than 200°C) or at high temperatures (oxygen pressure exceeding 1.01× 107Pa) to generate Co2O3. Therefore, to obtain Co3O4 products, the reaction can be controlled in the air at 400-900°C.
2) DSC/TG-MS of cobalt oxalate in situ catalyzed thermal decomposition of ammonium perchlorate.
Ammonium perchlorate (abbreviated as AP) is the most widely used oxidant in solid rocket propellants, and its thermal decomposition characteristics have an important impact on the combustion process of propellants. Cobalt oxalate can strongly catalyze the thermal decomposition of ammonium perchlorate (AP), which greatly reduces the decomposition temperature by 104°C. The decomposition reaction speed is very fast and the heat release of the decomposition reaction is very concentrated, and the heat release increases by 814J/g. Transition metal oxalates show broad application prospects in the field of ammonium perchlorate-based propellants.
Cobalt oxalate catalyzes ammonium perchlorate in situ, and nano-scale cobalt oxides are directly generated in the catalytic medium. The resulting new ecological catalyst has high catalytic activity, large specific surface area, and immediately participates in the catalytic reaction, maximizing the performance of nano-catalysts. The increase in the apparent reaction heat effect of ammonium perchlorate decomposition is mainly due to the adsorption of oxygen on the surface of the nascent cobalt oxide to generate oxygen peroxide ions (O-2), thereby accelerating the oxidation of ammonia adsorbed on the active center.
3) Prepare a cobalt powder with large particle size.
The method for preparing cobalt powder with a large particle size comprises the following steps: providing a reaction bottom liquid; adding ammonium oxalate and cobalt salt solution to the reaction bottom liquid, and reacting at 75-95° C. to form cobalt oxalate precipitate; When the D50 particle size of cobalt reaches 60 μm, the reaction is stopped and aging treatment is carried out; the aged cobalt oxalate is subjected to solid-liquid separation, dried, and crushed to obtain a cobalt oxalate precursor; the cobalt oxalate precursor is reduced , crushed to obtain the cobalt powder with large particle size.
The method for preparing cobalt powder with a large particle size has simple process, easy control and low cost, and is suitable for industrialized production. The cobalt powder obtained by the large particle size cobalt powder preparation method has high purity, good dispersibility, uniform particle size, relatively large D50 particle size, and a D50 particle size of 20-30 μm, which meets the diversified needs of cobalt powder in the industry .