The technology applied today presumes a placement of materials to be utilized in a closed cavity made with a gap between its bottom and wall to provide an access of air therein, sprinkling of the material with an Al- or Mg-based powder, and ignition and burial of wastes after completion of the combustion process. Unlike the described traditional method and in accordance with the newly-proposed method, a material to be burnt is placed in a cavity wherein a filtration combustion powder layer had previously been laid. The powder layer contains, in addition to magnesium and aluminum metal powder and/or their alloys, an oxidant and technical additives. Mass content of the metals in the powder should reach 91-97%; aluminum to magnesium ratio is chosen within 1:(0.5-1.5). An average diameter of magnesium particles D is taken larger than an average diameter of aluminum and/or its alloys. Nevertheless, the D-size shouldn’t exceed 6.65d.

When material is sprinkled and the mixture is ignited, the air is taken from the atmosphere and delivered therein. A part of the air is supplied through the powder into the combustion zone; the flow rate is carefully controlled.

Some modifications of the newly-developed method are also described in the patent. In the first modification of the method, a part of the air withdrawn from the atmosphere goes along the cavity wall and by-passes the closed cavity. In the second modification of the method, combustion products are drawn off and cleaned from dust, gas and aerosols contained therein. In the third modification of the method, combustion products are cooled before cleaning. In the fourth modification of the method, atmosphere air is mixed to combustion products. In the fifth modification of the method, an air flow drawn off from the atmosphere, which is then mixed with combustion products, is regulated depending on their temperature; the combustion products temperature is controlled at the cavity outlet. In the sixth modification of the method, combustion products are expanded before cleaning and then swirled in a vertical column. In the seventh modification of the method, cross section of the vertical column swirled combustion products flow passes through is reduced in the range of 0.65 to 0.85 of the original cross section size; cleaning liquid flow is organized as a liquid film embracing combustion products flow; the said film and gas flow move in a counterflow direction. In the eighth modification of the method, temperature in the combustion zone is controlled depending on the combustion products temperature through variation of the air flow passing through the combustion zone. In the ninth modification of the method, an air flow drawn off from the atmosphere is maximally increased after completion of the combustion process; the air flow passes through the working cavity. In the tenth modification of the method, the powder additionally includes liquid substances to bound water, or other substances, in particular, calcium compounds, in the amount of 1 to 5% by weight.

Varenykh N.M.

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