OXIDE PRODUCTS FORMED FROM CALCINED CARBONATE POWDER FOR USE AS BIOCIDE, CHEMICAL DETOXIFIER AND CATALYST SUPPORT PRODUCTS

摘要

A process and apparatus for manufacture of oxide products for use as biocide, chemical detoxifying, and catalytic support products, from caustic calcined carbonate powder, preferably from magnesite, dolomite, or hydromagnesite, is described. These oxide particles are characterized by high surface area, high porosity and a high degree of calcination, and the method of manufacture of utilizes an indirectly heated counterflow reactor. The oxides may be used as a powder, granules, or formulated into a slurry and used as a spray, emulsion, foam or fog, or the powder product may be directly applied. Also described is the formation of particles with microstructures defined by at least one nano-crystalline structure positioned on the outer surface of the particles.

主权项

1. A process for producing a biocide powder or a chemical detoxifier powder or a catalyst support from a carbonate compound, comprising the steps of:
a) grinding the mineral to produce a powder with a broad particle size distribution in the range of 1-100 microns, with a mean particle size of 10-20 microns; b) calcining the powder in an externally heated counterflow flash calciner to produce an oxide with a high surface area, high porosity, and a high degree of calcination; c) forming a stable, readily thinned, slurry of the hydrated oxide with about 60% solids in the final product after hydration, by the process of mixing the powder with water, under conditions in which the temperature is maintained at or near the boiling point of water until the hydration is completed, shear mixing is applied, and a carboxylic acid or salt is added as the thinning agent; d) quenching the slurry to below 60° C.; e) cooling the slurry to ambient; and f) adding additives to enhance the biocidal properties.