Blasthole stemming based on formaldehyde resins, system and charging method
AssigneeOxiquim S.A.
InventorsMarcos Antonio MORALES HERRERA, Claudio Humberto MOYA SAEZ
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for forming blasthole stemming for mining, which comprises charging a blasthole with a two-component mixture of resin and catalyst, wherein the two-component mixture produces a stiff foam in situ, and once hardened, the two-component mixture is then detonated. The invention also relates to a system for forming blasthole stemming for mining in order to carry out the method; the mixture used as blasthole stemming for mining that comprises the two-component mixture of resin and catalyst, wherein the resins are based on formaldehyde; and to a method for charging and detonating a mining blasthole by using the two-component mixture.
Claims15
A Method for forming in situ mining blast hole plugs comprising:
- loading a blast hole with a bi-component mixture of formaldehyde-based resin-catalyst on an explosive separated by a layer of drill cutting, where the bi-component mixture is produced in situ in the hole forming a foam, where the formaldehyde-based resins contained in a first pond are-is selected from phenol-formaldehyde (PF) resins, urea-formaldehyde (UF) resins, melamine-formaldehyde (MF) resins, melamine-urea-formaldehyde (MUF) resins, phenol-resorcinol-formaldehyde (PRF) resins, modified formaldehyde-based resins with lignin or tannins, and their derivatives;
- and the catalyst contained in a second pond is selected from acidic, basic or based on cross-linking agent catalysts;
- allowing the foam to set, forming a rigid foam with a density between about 0.2 and about 0.3 Kg/m3 and in which the reaction temperature is less than about 55° C., generating an expansion volume of about 3 to 5 times a loaded volume of the bi-component mixture;
- after the bi-component mixture has set, initiating detonation.
Dependencies are inferred from the claim text.