Study on Simultaneous Purification and Sodium Modification of Bentonite and Its Application in Pelletizing
Based on the low-quality calcium-based bentonite produced by an enterprise,the effect of multiplex sodalizer types and dosages on the performance indexes and yield indexes of bentonite was systematically investigated by carrying out the quality improvement and modification with multiplex sodiation process.The study results showed that when the dosage of sodalizer Na2CO3 was 2.0％,the yield of sodalized bentonite was 83.55％and its expansion index,water absorption and blue absorption were respectively increased from their original 5.0 mL/g,119％/(2 h)and 26.9 g/(100 g)to 22 mL/g,377.1％/(2 h)and 39.6 g/(100 g),which got the first grade indicator for sodiium bentonite.So the bentonite index could be significantly improved by using multiplex sodiation modification process,while the sodalizer ratios were 2.0％Na6P6O18 and 2.0％Na2CO3,the expansion index of double sodium bentonite was 77 mL/g,water absorption was 631.8％/(2 h),blue absorption was 39.1 g/(100 g),and the yield was 61.29％.In practice of pelletizing,when the addition of sodalizer Na2CO3 was 1.8％,the drop strength of green pellets increased to 4.6 times/(0.5 m)from original bentonite 3.0 times/(0.5 m)for the primary sodium bentonite and 8.6 times/(0.5 m)for the double sodium bentonite respectively.
万方数据
维普
