Fluidized bed furnace used for vanadium extraction and decarbonization of stone coal

Abstract

The invention particularly relates to a fluidized bed furnace used for the vanadium extraction and the decarbonization of stone coal. The invention has the following technical scheme that: a main bed (3), an auxiliary bed (5) and a cold bed (10) which are positioned at the bottom of a furnace body (8) are sequentially isolated from left to right respectively by a first fire bulkhead (6) and a second fire bulkhead (9), and gas burners (2) are evenly arranged on both the main bed (3) and the auxiliary bed (5) and externally connected with a gas source by a gas pipeline; the lower faces of the main bed (3) and the auxiliary bed (5) are respectively communicated with a first blower (1) by pipelines; the lower face of the cold bed (10) is communicated with a second blower (11) by a pipeline; and the upper part of the right side of the furnace body (8) is provided with a flue (7), and the middle part of the left side of the furnace body (8) is provided with a feed pipe (4). The invention has the following advantages of simple structure, high decarbonization speed and high stability; the invention can realize the fluidized-bed combustion of vanadium-containing stone coal with low heating value; and under the condition of deslagging in a large slag quantity, the invention realizes that the deslagging temperature is smaller than 150 DEG C.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy. In particular, it relates to a fluidized fluidized furnace for vanadium extraction and decarburization of stone coal. Background technique [0002] Decarburization is a pretreatment process before vanadium-containing stone coal is roasted for vanadium extraction. It is required to remove most of the organic matter and reducing minerals contained in the stone coal in a short period of time, and reduce the organic matter and reducing properties of the stone coal. Minerals inhibit the oxidation of vanadium, and make decarburization and roasting enable the formation of loose pores inside the material, which is beneficial to the subsequent stone coal roasting process (Zhang Xiaohui. Evaluation and Analysis of Stone Coal Oxidation Sodium Roasting Equipment [J]. Rare Metals and Hard Alloys, 1999, (3): 53-54). [0003] The main fuel of the existing ordinary fluidized fluidized furnace is anthra...

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Problems solved by technology

[0003] The main fuel of the existing ordinary fluidized fluidized furnace is anthracite or bituminous coal with a calorific value greater than 4000kcal / kg. If it is used to treat vanadium-containing stone coal with a calorific value of less than 1000kcal / kg, it is difficult to achieve boiling combustion, and it is easy to damage it when mixed with other solid fuels. Subsequent stone coal vanadium extraction process will have adverse effects; and because the ash content of stone coal is as high as 80%, resulting in a large amount of slag discharge from the fluidized fluidized furnace, without taking other measures, the slag discharge temperature will be greater than 500 ° C, which will seriously affect the fluidized fluidized furnace. operate

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