Abstract: Process for treating substances contaminated by heavy metals, according to which a calcium phosphate gel is produced and is brought into contact with the contaminated substances.

Abstract: Process for treating substances contaminated by heavy metals, according to which a calcium phosphate gel is produced and is brought into contact with the contaminated substances.

Abstract: Process for treating waste containing heavy metals, the process including a phosphating operation, a step of foaming the waste and a step of drying the foam, in which the waste undergoing the treatment results from the addition, to a base waste lightly contaminated with heavy metals, of a secondary waste whose content of heavy metals is at least twice that of the base waste.

Abstract: Process for the treatment of a sludge containing heavy metals and organic matter according to which foaming of the sludge is brought about and it is dried.

Abstract: Process for the treatment of a sludge containing heavy metals and organic matter according to which foaming of the sludge is brought about and it is dried.

Abstract: Method of inerting mineral residues comprising automobile grinding residues, in which method water is added to the mineral residues so as to form a paste, the paste is mixed with phosphoric acid, and the resulting mixture is calcined.

Abstract: Process for the treatment of a sludge containing heavy metals and organic matter according to which foaming of the sludge is brought about and it is dried.

Abstract: Process for rendering inert a sludge (1) comprising heavy metals and organic matter, according to which phosphoric acid (2) is added to the sludge and the latter is subjected to calcination (6). A hydraulic binder (9) is mixed with the product of the calcination (7) and mixed with water (8). The resulting mixture (11) is subjected to setting and curing.

Abstract: Method of inerting mineral residues comprising automobile grinding residues, in which method water is added to the mineral residues so as to form a paste, the paste is mixed with phosphoric acid, and the resulting mixture is calcined.

Abstract: Process for rendering inert a sludge (1) comprising heavy metals and organic matter, according to which phosphoric acid (2) is added to the sludge and the latter is subjected to calcination (6). A hydraulic binder (9) is mixed with the product of the calcination (7) and mixed with water (8). The resulting mixture (11) is subjected to setting and curing.

Abstract: Solid pulverulent reactive composition for the purification of a gas, the said composition comprising sodium bicarbonate and a caking inhibitor for sodium bicarbonate comprising lignite coke and/or a magnesium compound comprising magnesium (hydr)oxide. Process for the purification of a gas, according to which a reactive composition comprising sodium bicarbonate which is substantially devoid of silica is introduced into the gas and the gas is subjected to removal of dust.

Abstract: Process for purifying fumes originating from the incineration of household waste and for manufacturing an aqueous sodium chloride solution, according to which the fumes (3) are subjected to a dust-removal operation in order to separate out the ash (5), which is washed with water, the dust-free fumes (9) are treated with a basic reagent (11) comprising a sodium compound, and they are then subjected to a dust-removal operation, the dust (16) collected from the dust-removal operation is dispersed in water (8) originating from the washing of the ash (5), and the aqueous sodium chloride solution thus obtained (19) is purified.

Abstract: A process for removing nitrogen oxides and/or sulfur oxides and/or hydrogen chloride out of a gas, for example from the combustion of fuel or the incineration of waste, by injecting a mixture of a peroxide compound such as sodium percarbonate and an alkali metal salt such as alkali metal carbonates, alkali metal bicarbonates and solid solutions of alkali metal carbonate and alkali metal bicarbonate into the gas and filtering the gas in bag filter, cyclone or electrostatic separator.