Molybdenite concentrate self-heating swirl roasting process and equipment

Abstract

The invention relates to a self-heating cyclone roasting process and equipment for molybdenum concentrate. A cyclone roasting furnace with a furnace body heat exchange device is used to roast the molybdenum concentrate to produce industrial molybdenum oxide. The molybdenum concentrate is used in the roasting process. The heat released by the roasting reaction preheats the air entering through the interlayer heat exchange device in the lower furnace body. The preheated air is supplied from the bottom of the furnace into the cyclone roasting furnace. The cyclone air distribution device causes the molybdenite concentrate to circulate in the rotating air flow state. The roasting reaction occurs. The material coming out of the cyclone roasting furnace enters the interlayer heat exchange device on the upper part of the rotary roaster with the roasting airflow under the action of negative pressure. The desulfurization reaction is completed while rotating forward in the interlayer heat exchange device. The reacted gas The solid mixture enters the gas-solid separation and discharging device for gas-solid separation to separate solid roasting sand and roasting flue gas. After the roasting flue gas enters the heat exchanger and exchanges heat with the air, it is sent to SO under the action of the induced draft fan. 2 In the recovery and treatment system, the heat-exchanged air is sent to the flash dryer to dry the molybdenum concentrate entering the furnace.

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 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 additives...

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