Composition for dust control and improved material handling

Patent metadata

Field	Value
Publication number	US-10029953-B2
Application number	US-201615334505-A
Country	US
Kind code	B2
Filing date	Oct 26, 2016
Priority date	Jun 18, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

The invention provides methods and compositions for blends of glycerin and polyvinyl acetate emulsions which effectively decrease the dust forming tendency of particulate materials such as mineral fertilizer(s). These blends also reduce the caking tendency of mineral fertilizer(s), helping to maintain a free flowing material. Formulations based on these components, possibly including other additives, may also be useful for dust control and/or anticaking on other particulate materials including fertilizers, ores, coal, grain, etc.

First claim

The invention claimed is:

1. A composition comprising
a pile of particulate material comprising a dust generating material comprising a coal, a mineral fertilizer, a grain, or an ore;
polyvinyl acetate; and
glycerin,

wherein the polyvinyl acetate and glycerin are delivered to the pile in an emulsion and wherein the ratio of polyvinyl acetate to glycerin by weight in the composition is between 100:1 and 1:10, and wherein the dust forming tendency of the composition and the caking tendency of the composition are reduced compared to the pile of particulate material, and with the proviso that the composition excludes ethylene-vinyl-acetate copolymer.

2. The composition of claim 1 wherein the particulate material excludes low-ranked coal.

3. The composition of claim 1 wherein the particulate material excludes coal.

4. The composition of claim 1 wherein the composition excludes crude glycerin.

5. The composition of claim 1 wherein the composition excludes polymer derivatives of glycerin.

6. The composition of claim 1 wherein the particulate material in the absence of the glycerin and polyvinyl acetate would form one item selected from the list consisting of: ratholes, arches, pinch points, and any combination thereof.

7. The composition of claim 1 wherein the particulate material in the absence of the glycerin and polyvinyl acetate would cake.

8. The composition of claim 1 wherein the particulate material in the absence of the glycerin and polyvinyl acetate would cake but would not form one item selected from the list consisting of: ratholes, arches, pinch points, and any combination thereof.

9. The composition of claim 1 wherein the polyvinyl acetate is cured.

10. The composition of claim 1 wherein the emulsion comprises a carrier phase comprising the glycerin and a dispersed phase comprising the polyvinyl acetate.

11. The composition of claim 1 wherein the dust control and anti-caking properties of the composition are superior to the dust control and anti-caking properties of non-emulsified PVA bearing compositions.

12. The composition of claim 1 wherein the polyvinyl acetate is a copolymer of acrylic acid, pyrrolidone, an acrylate, vinyl alcohol, acrylamide, an ethylene halide, or a combination thereof.

13. The composition of claim 1 wherein the emulsion is cured.

Assignees

• Ecolab Usa Inc

Inventors

• Hay Daniel N T

Classifications

• C09D131/04

  Homopolymers or copolymers of vinyl acetate · CPC title

• C09K3/22 Primary

  for dust-laying or dust-absorbing · CPC title

• C08L31/04

  Homopolymers or copolymers of vinyl acetate · CPC title

• C05G3/20

  for preventing the fertilisers being reduced to powder; Anti-dusting additives · CPC title

• B01J2/30 Primary

  using agents to prevent the granules sticking together; Rendering particulate materials free flowing in general, e.g. making them hydrophobic · CPC title