膨润土超声离心钠化提纯试验研究

Experimental Study on Ultrasonic Centrifugal Sodium Purification of Bentonite

由于钠基膨润土比钙基膨润土具有更优良的性能,在工业上具有更广泛的用途,市场对高品位的膨润土需求量日趋增大。以四川三台、河南上天梯、广西田东3个产地的膨润土为原料进行钠化提纯试验,探索分散剂种类及用量、钠化剂用量、离心转速、离心时间对提纯效果的影响;对提纯产物的膨胀容及产率进行分析,确定最优的工艺条件;对比分析钠化提纯前后膨胀容、吸蓝量、蒙脱石含量。结果表明,经过钠化提纯后,3种膨润土的蒙脱石含量提高到90%以上,上天梯膨润土中方石英明显减少,斜发沸石等杂质去除;田东膨润土中石英、赤铁矿明显减少,伊利石等杂质去除;三台膨润土中石英、方解石明显减少,白云母等杂质去除,提纯效果显著。

Since sodium bentonite has better performance than calcium bentonite and has wider application in industry,the market demand for high-grade bentonite is increasing.The sodium desalination experiment was carried out with bentonite from Sichuan Santai,Henan Shangtianti and Guangxi Tiandong as raw materials,and the effects of dispersant type and dosage,sodium agent dosage,centrifugal speed and centrifugation time on the purification effect were investigated.The expansion capacity and the yield of the purified product were analyzed to determine the optimal process conditions;the expansion capacity,blue absorption amount and montmorillonite content before and after sodium purification were compared.The results showed that after sodium purification,the content of montmorillonite in all three bentonites was increased to over 90%.The quartz in the bentonite of Shangtianti was obviously reduced,and the impurities such as clinoptilolite were removed.The quartz and hematite in Tiandong bentonite were significantly reduced,impurities such as illite were removed;quartz and calcite in Santai bentonites were significantly reduced,impurities such as muscovite were removed,and the purification effect was remarkable.