Rotation-suspension smelting method, a burner and a metallurgical equipment

A rotation-suspension smelting method, wherein a dry powdered sulfide concentrate and a corresponding amount of an oxygen-containing gas are sprayed into a space within a high-temperature reaction tower, with a characteristic “wind-concentrate-wind” arrangement on the horizontal plane;

• wherein:
• the oxygen-containing gas includes the first oxygen-containing gas and the second oxygen-containing gas, in which the second oxygen-containing gas is sprayed vertically down in the form of an annular direct flow into the reaction tower, and forms a bell-shaped wind curtain that gradually expands horizontally and extends vertically under the effect of high temperature in the reaction tower;
• and the first oxygen-containing gas is transformed into a rotation-jet and jetted into the center of the wind curtain;
• a metered amount of the dry sulfide concentrate enters an annular space between the two gas flows of the rotation-jet and the wind curtain, in a direction deviated towards the central axis;
• in the center of the wind curtain, a circumferential expansion movement of the rotation-jet rotating at a high speed draws in the sulfide concentrate and a high-temperature gas flow from the bottom of the reaction tower simultaneously, forming a gas-particle two-phase rotation-jet that rotates and expands horizontally and moves down vertically;
• and
• during the movement process, the sulfide concentrate is ignited by a high-temperature off-gas and the high temperature radiated in the reaction tower, resulting in a violent combustion reaction with oxygen and release of SO2-rich off-gas, at the same time, a mixed melt containing matte (or metal) and slag is produced from the reaction;
• and the matte (or metal) is finally separated from the slag at the bottom of the reaction tower, thereby completing the metallurgical process.