摘要:
Sulfonated fatty acids and their salts are shown to be effective reagents for the low-temperature flotation of borax from a mixture of salt crystals, particularly a borax-Glauber''s salt-natron salt complex.
摘要:
A HIGH DENSITY, WATER SOLUBLE BORON PRODUCT FORMED FROM A MECHANICAL MIXTURE OF BORIC OXIDE WITH EITHER ANHYDROUS BORAX OR SODIUM TETRABORATE PENTAYDRATE (BORAX 5 MOL). THE PRODUCT HAS A NA20/B03 MOLAR RATIO OF FROM .16 TO 32 AND A LOO/SE DENSITY OF GREATER THAN 50 POUNDS/CU FT.
摘要:
The particles of a barium metaborate pigment are coated with amorphous hydrated silica in a proportion of between 3 and 20% by weight of the pigment. The coating may be produced by commingling barium metaborate particles in aqueous medium with suitable alkali metal silicates or de-ionized preparations of such silicates, heating the mixture to at least 75 DEG C., and separating the particulate solid product. The barium metaborate particles may be produced in the presence of the silicate, e.g. by reacting barium sulphide or hydroxide with borax or boric acid, the silicate being added with one or other of the reactants, or the reactants being added to a silicate solution; or the silicate may be added to a preformed suspension of barium metaborate particles. The products, on extraction with water at 25 DEG C. yield extracts which contain not more than 0.3% by weight of solids, and are useful as preservative pigments in oil paints and water emulsion paints. Specification 813,228 and U.S.A. Specification 2,818,344 are referred to.