Bright molybdenum concentrate self-heating type rotational flow roasting technology and equipment

Abstract

The invention relates to a bright molybdenum concentrate self-heating type rotational flow roasting technology and equipment. A rotational flow roasting furnace provided with a furnace body heat exchanging device is utilized to roast bright molybdenum concentrate so as to produce industrial molybdenum oxide. The heat emitted by a roasting reaction of the bright molybdenum concentrate is utilized to preheat air entering from an interlayer heat exchanging device of a lower furnace body in the roasting process, the preheated air is supplied into the rotational flow roasting furnace from the furnace bottom, a rotational flow wind distributing device makes the bright molybdenum concentrate be subjected to a roasting reaction under a rotational eddy state, a material coming out from the rotational flow roasting furnace enters an upper interlayer heat exchanging device of the rotational flow roasting furnace along with roasting eddy under the effect of negative pressure, a desulfurization reaction is completed in the interlayer heat exchanging device in the rotational advancing process, and a reacted gas-solid mixture enters a gas-solid separation discharging device to be subjected to gas-solid separation so that a solid roasted product and roasted smoke can be separated. The roasted smoke is sent to a SO2 recycling processing system under a draft effect of an induced draft fan afterentering a heat exchanger to exchange heat with the air, and the air after being subjected to heat exchanging is sent to a flash evaporation drying machine to dry the bright molybdenum concentrate.

Description

technical field [0001] The invention belongs to the field of molybdenite concentrate treatment, and in particular relates to a self-heating swirl roasting process and equipment for molybdenite concentrate. Background technique [0002] The roasting of molybdenite concentrate is a significant exothermic reaction process. Properly controlling the dissipation rate of heat energy generated by the reaction can save a lot of process auxiliary heat energy, and even the roasting process does not require additional heat energy consumption, and can reduce the generation of low-soluble molybdenum oxide and low concentration of SO 2 smoke. However, in the roasting process of the production of roasted molybdenum concentrate, whether it is the early simple reverberatory furnace roasting, or the widely used rotary kiln roasting, multi-hearth furnace roasting, and even the fluidized roasting and flash furnace that have not realized industrial applications Roasting and roasting with additi...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a molybdenite concentrate swirling roasting process and equipment to overcome the many shortcomings of rotary kiln, multi-hearth furnace and other piled roasting and fluidized roasting such as fluidized roasting, To solve the problem of long process flow, complex operation, large equipment investment, high cost, slow reaction rate, large furnace temperature fluctuation, difficult control of material roasting residence time, low thermal efficiency, poor product quality, and high solubility in the existing molybdenum concentrate roasting technology Molybdenum oxysulfide content is low, SO in the flue gas 2 The problem of low concentration and difficulty in recycling

Images