Effects of various acidification reagents and concentrations on activation effect of bentonite from Wulanlinge

Activation effect of bentonite from Wulanlinge ore,treated with phosphoric acid,sulfuric acid and hydrochloric acid,respectively,were investigated.Results showed clearly that activation effect with phosphoric acid was worse as a whole,namely,free acid of products prepared with phosphoric acid with range from 0.302% to 0.869% was much higher than that,ranging from 0.026% to 0.070%,of products prepared with sulfuric acid.However,the bleaching capability was lower than that of products prepared with sulfuric and hydrochloric acid.Furthermore,both acids activated bentonites prepared with 25% sulfuric acid and 30% hydrochloric acid possessed the highest bleaching capability.Sulfuric acid was more suitable for activation reagent by taking everything into account.With the increasing of acid addition amount,activity degree of products prepared with each acidification reagent had the same changing tendency with free acid.The addition amount of acid at the maximum of activity degree was lower than that at the maximum of bleaching capability,and loose density and bleaching capability of products had reverse change trends as a whole.