![]() While the process is simple on a laboratory scale, making precipitated calcium carbonates commercially on a large scale requires a great deal of process control and process technology to assure the right size, uniformity, shape, surface area and surface chemistry. If the PCC is to be used as a dry product, the slurry is dewatered, dried, milled, packaged and tested.If the PCC is to be used in a paper mill or shipped to a latex paint plant, the lower solids slurry may be used as is, or processed to bring up the solids level, then tested before transfer or shipment.Separate additional impurities and grit from the PCC slurry.Calcium carbonate reforms, and since it is insoluble in water, precipitates out. Combine the captured carbon dioxide with the slaked lime.Separate out additional impurities from the slaked lime.Add the lime to water to form calcium hydroxide (hydrated lime or slake).The carbon dioxide can be captured for reuse. Calcine (heat) in a kiln to 1850° F, which takes the calcium carbonate apart, forming lime (CaO) and carbon dioxide gas (CO2).Separate some of the impurities from the crushed rock.Crush the rocks to the particle size needed for processing – small stones or powder.Mine high purity calcium carbonate rock.The milk of lime process is simple in concept: Baltimore: Williams and Wilkins, 1976., p.How Is Precipitated Calcium Carbonate (PCC) Made?Īlmost all PCC is made by direct carbonation of hydrated lime, known as the milk of lime process. Clinical Toxicology of Commercial Products. ![]()
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