Process for producing inorganic particles for selectively removing contaminants from fluids

Abstract

The present paper proposes the production process of an inorganic medium, particulate, regeneratable, and able to remove contaminants by catalytic oxidation or reduction, as well as heavy metals removal by absorption from superficial, subterranean or dirty waters. The specific material is constituted by a composite of porous inorganic particles, on which surface it occurs the deposition of gamma dioxide manganese or epsilon manganese, the product showing a great selectivity and a high capacity, and may be produced into different granulometries, porosities and densities, and may also be produced specifically to meet different requirements of separators projects.

Description

Claims

1. A process for producing inorganic particles for selectively removing contaminants selected from the group consisting of: heavy metals, lead, metals of arsenic family, chlorine, dissolved solids, iron, manganese and combination thereof; from fluids selected from the group consisting of: superficial water, subterraneous water, dirty water and potable water; comprising a particulate, regeneratable, oxidizing, reducing, catalytic and absorbent filtering medium, the process comprising depositing a film of manganese dioxide through a chemical process over a porous inorganic support particles selected from the group consisting of: clays, rocks, ceramics, aluminas, zirconia, silica and combinations thereof.

2. The process according to claim 1, wherein the film of manganese dioxide is from a manganese nitrate solution.

3. The process according to claim 1, wherein the step of depositing a film of manganese dioxide through a chemical process over a porous inorganic support particulate comprises the steps of; (a) placing the support particles inside an oven having an internal water vapor/oxygen rate within a range between 10/1 and 1/10(b) covering the support particles with the manganese nitrate solution;(c) drying the covered support particles at a temperature range of between 110° C. and 200° C.;(d) thermically treating the covered support particles for decomposing the nitrate at a temperature range of between 100° C. and 400° C., obtaining NOx and precipitating MnO2 repeating the deposition procedure to a maximum of ten times, if necessary.

4. The process according to claim 3, wherein the water vapor/oxygen rate inside the oven is 4/1.

5. The process according to claim 1, wherein the mineralogical structure of the manganese dioxide is selected from the group consisting of: gamma and epsilon.

6. The process according to claim 1, wherein the support particles are particles of variable granulometry.

7. The process according to claim 1, wherein the support particles are particles of variable densities.

8. The process according to claim 1, wherein the covered filtering particles are regenerated by a rinsing process with a solution selected from the group consisting of: chlorine in aqueous solution, permanganates, sodium hypochlorite and sulfuric acid.