# US 2014/0193642 A1 · Non-Caking Mine Rock Dust

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- Number: US 2014/0193642 A1
- Document ID: US20140193642A1
- Status: Published application
- Kind: A1
- Application number: 14/151,004
- Filed: 2014-01-09
- Published: 2014-07-10
- Earliest claimed: 2013-01-09
- Assignees: Imery Pigments, Inc.
- Applicants: Imery Pigments, Inc.
- Inventors: David Anstine; Dickey Shurling, JR.
- Web page: https://patentgrep.com/patent/US20140193642A1

## CPC

- E21F 5/12: Composition of rock dust
- Y10T 428/2982: Particulate matter [e.g., sphere, flake, etc.]
- E21F: SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A composition for use as rock dust is disclosed. The composition may include a ground inorganic particulate material treated with at least one fatty acid, a salt thereof, or an ester thereof. Also disclosed is a composition including coal dust and mine rock dust, which may include a ground inorganic particulate material treated with at least one fatty acid, a salt thereof, or an ester thereof. The amount of mine rock dust may be sufficient to render the coal dust explosively inert. The composition may also include an untreated inorganic particulate material. The treated inorganic particulate material may be calcium carbonate. The untreated inorganic particulate material may be calcium carbonate. The fatty acid may be stearic acid.

## Claims

### Claim 1

A composition comprising:
mine rock dust comprising a dry ground inorganic particulate material treated with at least one fatty acid, a salt thereof, or an ester thereof.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the mine rock dust further comprises an untreated inorganic particulate material.

### Claim 3 (depends on 1)

The composition of claim 1, wherein the treated dry ground inorganic particulate material is ground calcium carbonate.

### Claim 4 (depends on 2)

The composition of claim 2, wherein the untreated inorganic particulate material is calcium carbonate.

### Claim 5 (depends on 2)

The composition of claim 2, wherein the ratio of treated dry ground inorganic particulate material to untreated inorganic particulate material ranges from about 1:99 to about 99:1.

### Claim 6 (depends on 1)

The composition of claim 1, wherein the treated dry ground inorganic particulate material has a d50 ranging from about 1 to 75 microns.

### Claim 7 (depends on 2)

The composition of claim 2, wherein the untreated inorganic particulate material has a d50 ranging from about 5 to about 50 microns.

### Claim 8 (depends on 1)

The composition of claim 1, wherein the at least one fatty acid, salt thereof, or ester thereof comprises one or more fatty acids, salts thereof, or esters thereof with a chain length of C16 or greater.

### Claim 9 (depends on 1)

The composition of claim 1, wherein the fatty acid comprises stearic acid.

### Claim 10 (depends on 1)

The composition of claim 1, wherein the fatty acid, salt thereof, or ester thereof is present in an amount not greater than about 2.5% by weight of the dry ground inorganic particulate material.

### Claim 11 (depends on 1)

The composition of claim 1, wherein the dry ground inorganic particulate material is substantially free of dispersant.

### Claim 12 (depends on 1)

The composition of claim 1, wherein the dry ground inorganic particulate material has a Hegman of about 5.5 or less.

### Claim 13 (depends on 1)

The composition of claim 1, wherein the dry ground inorganic particulate material has a BET surface area of at least about 0.3 square meters/gram.

### Claim 14 (depends on 1)

The composition of claim 1, wherein the composition has a contact angle ranging from 10 to 150 degrees.

### Claim 15

A composition comprising:
coal dust; and
mine rock dust comprising a dry ground inorganic particulate material treated with at least one fatty acid, a salt thereof, or an ester thereof, wherein the amount of mine rock dust is sufficient to render the coal dust explosively inert.

### Claim 16 (depends on 15)

The composition of claim 15, wherein the mine rock dust further comprises an untreated inorganic particulate material.

### Claim 17 (depends on 15)

The composition of claim 15, wherein the treated dry ground inorganic particulate material is ground calcium carbonate.

### Claim 18 (depends on 16)

The composition of claim 16, wherein the untreated inorganic particulate material is calcium carbonate.

### Claim 19 (depends on 15)

The composition of claim 15, wherein the treated dry ground inorganic particulate material has a d50 ranging from about 1 to 75 microns.

### Claim 20 (depends on 16)

The composition of claim 16, wherein the untreated inorganic particulate material has a d50 ranging from about 5 to about 50 microns.

### Claim 21 (depends on 15)

The composition of claim 15, wherein the at least one fatty acid, salt thereof, or ester thereof comprises one or more fatty acids, salts thereof, or esters thereof with a chain length of C16 or greater.

### Claim 22 (depends on 15)

The composition of claim 15, wherein the fatty acid comprises stearic acid.