Fluidized bed furnace device for circularly roasting molybdenum concentrates and method for using same

Abstract

The invention discloses a fluidized bed furnace device for circularly roasting molybdenum concentrates, which comprises a fluidized bed furnace, a dust collection system, a flue gas recycling system, an air supply system, a feeding system and a discharged-material packing automation system, wherein the discharged-material packing automation system is connected to a discharge outlet of the fluidized bed furnace; the dust collection system and the feeding system are both connected to a feed inlet of the fluidized bed furnace; the air supply system is connected to an air chamber of the fluidized bed furnace, and is composed of a Roots blower, a heating facility and a facility capable of indicating and controlling the pressure and air inflow volume in the air chamber; and the feeding system can uniformly and continuously feed molybdenum concentrates with sizes of 20-200 meshes into the fluidized bed furnace according to a given amount. The invention also discloses a method for using the fluidized bed furnace device for circularly roasting molybdenum concentrates, through which molybdenum concentrates are in full contact with enough oxygen, so that an effect of supplying heat without using an external heat source in the roasting process of molybdenum concentrates is achieved, and high-dissolubility molybdenum oxides of which the soluble molybdenum content is greater than 98% can be efficiently produced, therefore, the method is storing in production capacity; and the concentration of SO2 in roasting in flue gas can reach 4%.

Description

technical field [0001] The invention relates to the technical field of industrial molybdenum oxide production, in particular to a fluidized fluidized furnace device and a method for producing highly soluble industrial molybdenum oxide by roasting 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. The roasting of molybdenum concentrate in sufficient air is a significant exothermic reaction process. The roasting process does not need to consume heat energy and should not generate low-soluble molybdenum oxide and low-concentration SO 2 smoke. However, in the production of roasted molybdenum concentrate, no matter it is the early simple reverberatory furnace roasting, or the widely used rotary kiln roastin...

AI Technical Summary

Problems solved by technology

However, in the production of roasted molybdenum concentrate, no matter it is the early simple reverberatory furnace roasting, or the widely used rotary kiln roasting and multi-hearth furnace roasting, the oxidative desulfurization efficiency is low, the roasting time is long, and it is impossible or impossible to produce highly soluble molybdenum concentrate. molybdenum, and the production capacity is low, and an external heat source is required to provide roasting heat to ensure the smooth progress of the reaction

Roasting heat is generally provided by external heat sources such as coal, oil, various gas, natural gas, electricity, etc., which not only consumes fuel or other energy sources significantly, but also provides oxidants for the roasting reaction with oxygen-poor flue gas generated by fuel combustion instead of air, resulting in roasting smoke. The gas volume expands, forming a dilution effect, so that the SO in the roasting flue gas 2 The volume concentration is only about 1%. This concentration is obviously too low, which makes comprehensive recycling and acid production very difficult and the cost increases sharply.

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