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Calcium and magnesium carbonates suitable for paper mfr - made by feeding carbon dioxide into aq suspension of calcined dolomite
Calcium and magnesium carbonates suitable for paper mfr - made by feeding carbon dioxide into aq suspension of calcined dolomite
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机译:通过将二氧化碳供入煅烧白云石水溶液中而制得的适用于造纸的碳酸钙和碳酸镁
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摘要
Process for mfg. carbonates of calcium and/or magnesium, the novelty being that by heating to 1000-1100 degrees C, dolomite is converted into a mixt. of calcium and magnesium oxides which are suspended in water using 1 pt. wt. of oxides and 20 pts. wt. water and the carbon dioxide is introduced into the suspension to convert the hydroxides into the corresponding carbonates. The initial starting material is pref. natural dolomite calcined in a rotary drum furnace, and the gas fed into the suspension is pref. CO2 or a mixt. of CO2 and N2, esp. the exhaust gas from the drum furnace. Before or during the slaking of the oxides, additional amounts of Ca or Mg oxide, hydroxide or carbonate may be added. Used e.g. for mfr. of basic calcium-magnesium carbonate as a filler or coating for mfg. glossy papers, where the carbonate has a degree of whiteness above 95%.
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