浏阳白云石制轻质碳酸镁煅烧和碳化工艺研究

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

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。

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 ~C, 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.