Occidental Chemical Corporation

Hooker Chemicals & Plastics Corporation

John A Peterson

Mohan Singh Saran

Joseph S Wisnouskas

David C Ehlers

A homogeneous, particulate mixture of alkali metal pyrophosphates and tripolyphosphates is prepared by flash drying an aqueous solution of alkali metal orthophosphates having an alkali metal to phosphorus mole ratio in the range of 5:3 to 6:3, and calcining the resultant dried particles. Preferably, the alkali metal is sodium and the orthophosphate solution is adjusted to provide a major proportion of sodium pyrophosphate and a minor proportion of sodium tripolyphosphate in the final product.

Homogenous mixtures of polyphosphates

A homogeneous, particulate mixture of alkali metal pyrophosphates and tripolyphosphates is prepared by flash drying an aqueous solution of alkali metal orthophosphates having an alkali metal to phosphorus mole ratio in the range of 5:3 to 6:3, and calcining the resultant dried particles. Preferably, the alkali metal is sodium and the orthophosphate solution is adjusted to provide a major proportion of sodium pyrphosphate and a minor proportion of sodium tripolyphosphate in the final product.

Homogeneous mixtures of polyphosphates

A dry differential flotation reagent for molybdenum-bearing ore is disclosed comprising from about 1 to about 30 percent by weight of NaSH, 0 to 20 percent by weight of NaOH, 60 to 90 percent by weight of a mixture of sodium thiophosphates comprising, as major components thereof, Na.sub.3 PS.sub.4, Na.sub.3 PS.sub.3 O, Na.sub.3 PS.sub.2 O.sub.2, and Na.sub.3 PO.sub.3 S, with Na.sub.3 PS.sub.4 further comprising from about 15 mole percent to about 70 mole percent of phosphate mixture. The flotation reagent can be prepared by reacting P.sub.4 S.sub.10 with NaOH and NaSH in a molar ratio of about 1:16. When added to a flotation vessel containing molybdenum concentrate, the flotation reagent promotes suppression of lead and copper sulfides, even without the addition of sodium cyanide, to permit the improved recovery of molybdenum with a lower level of impurities.

Differential flotation reagent for molybdenum separation

A dry differential flotation reagent for molybdenum-bearing ore is disclosed comprising from about 1 to about 30 percent by weight of NaSH, 0 to 20 percent by weight of NaOH, 60 to 90 percent by weight of a mixture of sodium thiophosphates comprising, as major components thereof, Na.sub.3 PS.sub.4, Na.sub.3 PS.sub.3 O, Na.sub.3 PS.sub.2 O.sub.2, and Na.sub.3 PO.sub.3 S, with Na.sub.3 PS.sub.4 further comprising from about 15 mole percent to about 70 mole percent of the phosphate mixture. The flotation reagent can be prepared by reacting P.sub.4 S.sub.10 with NaOH and NaSH in a molar ratio of about 1:16. When added to a flotation vessel containing molybdenum concentrate, the flotation reagent promotes suppression of lead and copper sulfides, even without the addition of sodium cyanide, to permit the improved recovery of molybdenum with a lower level of impurities.

Differential flotation reagent and method of preparation

This invention is concerned with compositions of granular sodium tripolyphosphate (STPP) and their manufacture, which are suitable for use in the manufacture of automatic dishwasher detergents. The granular STPP compositions contain an overall 30 to 40% by weight of the STPP Phase I modification and no more than 5% of the granules composing the composition shall be of both +50 mesh size and under 25% Phase I concentration. Particle size of the total composition is 10% maximum of both +20 mesh and -100 mesh fractions. Apparent density is 0.7 to 0.9 grams per cubic centimeter. Such compositions are made by using only STPP materials in the 30 to 40% range or by mixing -50 mesh fractions of lower Phase I material with coarser fractions of higher Phase I material so that Phase I content of the total mixture is 30 to 40%.

Composition of an STPP product for dishwasher detergent formulations and

The electrolysis of aqueous alkali metal chloride solutions wherein chlorine is liberated at the anode, is improved through the use of an anode comprising a valve metal substrate, a coating thereon of conductive oxide bronze, and an outer coating of a noble metal oxide.

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Niagara Falls, NY, United States of America

John A Peterson