Patent ID: 9228435
Filing Date: 2016-01-05
CPC Classification: E21F

Claim Text:
1. A method of applying rock dust to a mine wall comprising: pumping a mixture of rock dust and water by means of a pump, from said pump through a first conduit, to a combiner; mixing a foamable liquid and air to produce a flowable foam, and delivering the flowable foam through a second conduit to said combiner; combining said mixture of rock dust and water with said flowable foam in said combiner, to produce a mixture of foam, water and rock dust; causing said mixture of foam, water and rock dust to flow from said combiner to a nozzle connected to said combiner; and while combining rock dust and water with foam in said combiner, applying said mixture of foam, water, and rock dust to a mine wall by means of said nozzle, wherein the distance through which said mixture of rock dust, water, and foam flows from said combiner to said nozzle is less then 15 meters, and the distance through which said mixture of rock dust and water flows from said pump through said first conduit to said combiner is greater than said distance through which said mixture of rock dust, water, and foam flows from said combiner to said nozzle.