Lignosulfonate coated calcium chloride

Patent metadata

Field	Value
Publication number	US-11345838-B2
Application number	US-202016994840-A
Country	US
Kind code	B2
Filing date	Aug 17, 2020
Priority date	Apr 14, 2016
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

Methods of melting ice using ice-melt compositions including calcium chloride coated with a lignosulfonate material are disclosed. The ice-melt compositions can be useful as ice-melt products with improved safety. A method can include applying an ice-melt composition to ice, the ice-melt composition comprising coated particles. Each coated particle can include a core comprising calcium chloride and a coating at least partially surrounding the core, the coating comprising a lignosulfonate material.

First claim

What is claimed is:

1. A method of making an ice-melt composition, the method comprising:
providing a plurality of particle cores, wherein the plurality of particle cores comprises calcium chloride;
coating the plurality of particle cores with a liquid coating composition comprising a lignosulfonate material to form the ice-melt composition; and
drying the ice-melt composition, wherein drying comprises administering a drying additive comprising one or more of precipitated silica, anhydrous magnesium sulfate, or diatomaceous earth.

2. The method of claim 1 , wherein the lignosulfonate material comprises calcium lignosulfonate, sodium lignosulfonate, ammonium lignosulfonate, or mixtures thereof.

3. The method of claim 1 , wherein about 60% or more of the coated particles are sized at about 35 mesh or greater.

4. The method of claim 1 , wherein 40% or less of the coated particles are sized at about 3.5 mesh or greater.

5. The method of claim 1 , wherein the lignosulfonate material is soluble in water.

6. The method of claim 1 , wherein the ice-melt composition releases heat when the ice melts.

7. The method of claim 1 , wherein the core consists essentially of the calcium chloride, and the coating consists essentially of the lignosulfonate material, an optional colorant, the drying additive, an optional non-slip aggregate, and an optional ice-melting material selected from the group consisting of a chloride salt and urea.

8. The method of claim 1 , wherein the liquid coating composition consists essentially of the lignosulfonate material, wherein the ice-melt composition comprises about 60% to about 99.9%, by weight, of the calcium chloride and about 0.1% to about 5%, by weight, of the lignosulfonate material.

9. The method of claim 1 , wherein coating the plurality of particle cores comprises spray coating the liquid coating composition onto the plurality of particle cores.

Assignees

• Oms Invest Inc

Inventors

• Dammann Laurence G
• Phillips Roger D
• King Kyle D

Classifications

• C01F11/24

  Chlorides · CPC title

• C01P2004/60

  Particles characterised by their size · CPC title

• C09K3/185 Primary

  Thawing materials · CPC title

• B01J2/006

  Coating of the granules without description of the process or the device by which the granules are obtained (to prevent the granules sticking together B01J2/30) · CPC title