Abstract: A device to inject liquid matter into a plasma torch, comprising N(N?1) groups of injectors arranged on the periphery of a flow region of the plasma, each group comprising at least n (n?2) injectors which are arranged either side of the plasma flow axis, so as to inject said liquid matter into the plasma in a direction at least partly opposite the direction of plasma flow.

Abstract: The invention concerns a method for conditioning in a thermosetting resin a quantity of waste stored in water.According to the invention, a liquid hardening agent, immiscible with water and having a density greater than that of the water, is used in order to harden the resin; this hardening agent is then mixed with the waste stored in the water and then the waste is left to decant in the hardening agent; then the water present above the decanted waste transferred into the liquid hardening agent is extracted and the waste transferred into the liquid hardening agent is mixed with the epoxy resin so as to obtain a solid block.In particular, the waste may be ion exchanger resins. Adding of the hardening agent to the waste stored in the water makes it possible to limit a temperature rise during hardining and to obtain solid products having an improved density.