we have a process to precipitate CaCO3 we need to control product particle size
Precipitated calcium carbonate (PCC) and nano calcium carbonate (nano CaCO3) are both forms of calcium carbonate, but they are not the same thing.
PCC is typically produced by the reaction of calcium hydroxide and carbon dioxide, resulting in the precipitation of calcium carbonate crystals. These crystals are typically in the micron-sized range, meaning they are much larger than nano-sized particles.
Nano calcium carbonate, on the other hand, is characterized by its small particle size, typically less than 100 nanometers. Nano CaCO3 can be produced by various methods, such as precipitation, sol-gel, and gas-phase synthesis.
Therefore, PCC is not considered to be nano calcium carbonate, although it may be possible to produce nano-sized PCC particles using specialized techniques.
Raghd Muhi Al-Deen Jassim A simple Stokes’ Law calculation will show you that precipitated calcium carbonate cannot be ‘nano’ (< 100 nm).
Jan Jeník can you give me more about Solvay to produce calcium carbonate please, it is very interesting
I apologize for the delay. I refreshed my memory from the books. CaCO3 forms crystalline modifications: temperature less than 29C = Calcite, temperature more like 80C crystal Aragonite is formed is orthorhombic axis a= 0.4959nm axis b= 0.7968nm axis c= 0.5741nm. Production ended 32 years ago, the only customer disappeared. The smallest size of 10um was produced with an accuracy of 1%. It is not possible to produce Ca(OH)2 in an aqueous solution because the crystals grow unevenly when CO2 is introduced. I have a crazy idea for you: heat the water to 80C, add Ca(OH)2 until saturation. Pour the clear solution into a beaker with a stirrer and suddenly add drinking soda water diluted with water 1:1 (a highly saturated drink will foam) Aragonite crystals should appear cloudy. I wish you success and health.
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