哈密某膨润土的性能表征与提纯

哈密市拉伊格来克膨润土矿是我国目前探明的唯一大型钠基膨润土矿。为确定该膨润土的高效、低耗提纯工艺,在对该膨润土进行性能测试与表征基础上,进行了化学提纯与高速离心提纯效果对比。结果表明:1该膨润土蒙脱石含量达78%、吸蓝量为0.35 g/g、胶质价为54 mL/g、膨胀容为27 mL/g、膨润土阳离子交换量为1.01mmoL/g,属优质钠基膨润土矿。2投资与运行成本较高的高速离心法在浆液浓度为6%、离心分离速度为2 500r/min、离心分离时间为15 min情况下,可获得吸蓝量为0.429 g/g、蒙脱石含量为97.00%的高品质膨润土精矿;化学法在浆液浓度为7%、pH=7.0、六偏磷酸钠浓度为0.075%情况下,获得吸蓝量为0.418 g/g、蒙脱石含量为94.70%的膨润土精矿,但该提纯方法具有工艺技术简单、生产成本较低的特点。

Performance Characterization and Purification of a Bentonite Ore in Hami

At present，the Layigelaike bentonite ore in Hami was the only explored large sodium base bentonite ore in our country.In order to find the purification process of bentonite with high efficiency and low consumption，comparison of chemical purification with high speed centrifugal process was conducted based on the bentonite property.The results show that：①the montmorillonite content of bentonite is up to 78%，Ethylene blue adsorbed is 0.35 g/g，gelatin price 54 mL/g，expansion capacity 27 mL/g，cation exchange capacity of 1.01 mmol/g，and the ore belongs to high quality sodium base bentonite ore.②under conditions of serum concentration of 6%，centrifugal separation speed of 2 500 r/min，and the centrifugal separation for 15 min，high-quality bentonite concentrate with 0.429 g/g of ethylene blue adsorbed and 97.00% of montmorillonite is achieved by adopting high speed centrifugation purification with high investment and operation costs;with serum concentration of 7%，pH 7.0 and the concentration of sodium hexametaphosphate 0.075%，the bentonite concentrate with 0.418 g/g ethylene blue adsorbed and 94.70% of montmorillonite is achieved by adopting the chemical purification method with characteristics of easier operation and lower production costs.