Polyferric silicate sulfate containing boron(PFSSB),a new type of inorganic polymer flocculant,was prepared using sodium silicate,ferric sulfate and sodium borate as raw materials under the conditions of SiO_2 mass fraction 3%,pH 3,activation time 30min,mol ratio of Fe to Si 0.

The density ρ and surface tension γ of lithium tetraborate melt have been systematically measured from 1100K up to about 1500K.