浏阳白云石制轻质碳酸镁 煅烧和碳化工艺研究

考察了白云石煅烧工艺对煅烧白云石活性度的影响。结果表明，对于粒度为5～15 mm、15～20 mm、20～30 mm的白云石，其煅烧温度应分别控制在995、1 005、1 020 ℃。粒度为15～20 mm的白云石，在995 ℃下的煅烧时间为60～100 min。通过碳化工艺实验，优选出较合理的碳化工艺条件，即碳化在加压状态下进行，压力控制在 0.30 MPa以上、温度控制在35 ℃ 以下、浆液中氧化镁质量浓度控制在10～12 g/L、碳酸化反应时间为50 min。

Study on technological process of calcining and carbonation for production of light magnesium carbonate from dolomite

Influence of calcining technology on the activity of calcined dolomite was investigated．Results showed that the calcining temperatures should be controlled at 995 ℃，1 005 ℃，and 1 020 ℃ for the dolomite with particle size of 5~15 mm， 15~20 mm，and 20~30 mm，respectively；at the calcining temperature of 995 ℃，calcination time for the dolomite with grain size of 15~20 mm was at 60~100 min．By the test of carbonation，the reasonable technological conditions were optimized，i.e. the carbonation was conducted under pressure and the pressure was controlled above 0.3 MPa；the temperature was below 35 ℃， the MgO mass concentration in the slurry was 10～12 g/L，and the carbonation time was 50 min.