Molybdenum concentrate self-heating roasting method and device thereof

Abstract

The invention relates to the technical field of producing industrial molybdenum oxide from molybdenum sulfide concentrates, mainly providing a molybdenum concentrate self-heating roasting method and a device thereof. In the invention, a rotary kiln with a kiln body heat exchanger is utilized to roast molybdenum concentrates to produce the industrial molybdenum oxide; in the roasting process, the heat released by the roasting reaction of the molybdenum concentrates is utilized to preheat air entering from the kiln body heat exchanger, the preheated air is fed into the rotary kiln from the discharge end of a kiln head so as to be subject to roasting reaction together with the molybdenum concentrates, heat is supplemented to materials in a residual sulphur removal region at the rear segment of the rotary kiln, and the temperature of a reaction high-temperature region at the middle segment of the rotary kiln is reduced; and after the starting up process, the molybdenum concentrate roasting process is completed under the state of no external heat supply. The invention solves the problems of overheat during the roasting main reaction period of the molybdenum concentrates and insufficient heat in the later period of desulfuration and the difficulty of feeding cooling air and discharging hot air for a high temperature rotary shell; and the device is simple, heat allocation is reasonable, temperature adjustment of each segment in the kiln is flexible, no external heat source is needed, the product quality is high, and the equipment yield is large.

Description

technical field [0001] The invention relates to the technical field of molybdenum sulfide concentrate production and industrial molybdenum oxide, and mainly provides a self-heating roasting method and device for molybdenum concentrate. Background technique [0002] At present, about 96% of all molybdenum sulfide concentrates used at home and abroad must first be converted into industrial molybdenum oxide through roasting, and then soluble molybdenum salts can be further extracted, and then smelted into molybdenum metal or its alloys, and most of them are used in iron and steel metallurgy. Molybdenum concentrate roasting in the absence of oxygen, MoS 2 Reacts with oxygen to form brown MoO 2 , and release heat; when oxygen is sufficient, light yellow MoO is generated 3 , while releasing heat. The reaction thermochemical equation is as follows: [0003] MoS 2 +3O 2 →MoO 2 +2SO 2 +817kJ [0004] MoO 2 +0.5O 2 →MoO 3 +111kJ [0005] MoS 2 +3.5O 2 →MoO 3 +2SO 2 +9...

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Problems solved by technology

[0013] In view of the above problems, the present invention provides a molybdenum concentrate self-heating roasting method and its device, the purpose of which is to solve the problem that the existing molybdenum concentrate roasting process and equipment need an external heat source to provide heat when the molybdenum concentrate is roasted, and the main reaction Excessive heat in the early stage, heat shortage in the late stage of desulfurization, and excessive roasting flue gas volume, roasting flue gas SO 2 low concentration problem

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