Back to results
US 4,008,108 AGranted
Formation of foamed emulsion-type blasting agents
AssigneeE. I. Du Pont de Nemours and Company
InventorJoseph Dean Chrisp
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeE. I. Du Pont de Nemours and Company
InventorJoseph Dean Chrisp
Estimating the term…
In the chemical foaming of emulsions to form blasting agents, the gas-generating material (foaming agent), or a component thereof, is introduced into a stream of the emulsion and the stream thereafter delivered into packaging receivers, any work required to be performed on the emulsion after the addition of the gas-generating material thereto, e.g., pumping or mixing, being performed before substantial foaming due to reaction of the gas-generating material, as a rule before more than about 50 percent of the total density decrease attainable by foaming, has occurred. The gas-generating material can be added to a stream of fine emulsion and preferably mixed for uniform distribution through the emulsion, or to a stream of coarse emulsion, which is mixed with high shear to convert the coarse emulsion to a fine emulsion, mixing in either case taking place before substantial foaming has occurred.
In a method of chemically foaming an emulsion comprised of oxidizing salt, carbonaceous fuel, water and emulsifier to form a blasting agent wherein a gas-generating material is injected into the emulsion and the injected emulsion is subjected to work, said gas-generating material reacting with gas evolution so as to foam said emulsion and thereby decrease the density thereof, the improvement comprising injecting the gas-generating material into a stream of the emulsion, subjecting the injected stream to work only before more than about 50 percent of the total density decrease that is attainable by the full foaming of said emulsion has occurred, and delivering the injected stream into packaging receivers where the remainder of the density decrease takes place, whereby a substantially uniform lowered density is achieved from one receiver to another.
A method of forming a sensitized emulsion blasting agent comprising:
Dependencies are inferred from the claim text.