Stone coal vanadium ore shaft roasting method and system

Abstract

The invention provides a stone coal vanadium ore shaft roasting method. The method comprises the following steps: crushing stone coal vanadium ore, mixing, finely grinding and pelletizing with an additive and sodium peroxide, drying the obtained raw nodules and feeding the raw nodules into the shaft; igniting combustible carbon in the stone coal pellet through an ignition system, heating the shaft, and simultaneously initiating an oxygen production reaction, wherein the temperature in the shaft is 800-850 DEG C, and the oxygen content is more than 30 percent; mixing circulating top gas and preheated air to serve as reaction gas, and introducing the reaction gas into the shaft for oxidizing and roasting the raw nodules for 2-3 hours; and cooling and discharging the clinker, and crushing the clinker for V2O5 extraction; and removing the dust and desulfurating the roasted top gas, allowing the partial top gas to pass through a heat exchanger for preheating the air, and mixing the partial top gas and the preheated air to serve as the reaction gas so as to input into the shaft. The reaction gas heating device is not required, and the energy-saving effect is achieved; CO2 is consumed in the shaft by sodium peroxide so as to generate oxygen, and the oxidizing atmosphere is intensified; the top gas is purified and recycled, the oxygen utilization rate is improved, and the pollution of dust and harmful gas is reduced; and moreover, the parameters such as roasting atmosphere, temperature, time and the like are easily controlled.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to a shaft furnace roasting method and system for stone coal vanadium ore. Background technique [0002] Vanadium is a global scarce resource and an important strategic metal. Due to its high tensile strength, hardness, fatigue resistance and good corrosion resistance, it is widely used in steel, nonferrous metallurgy and chemical industries. More than 85% of them are used in the steel industry. With the development of the iron and steel industry in the direction of high-quality, refined and special products, the application of high-quality vanadium steel will become more and more extensive. Experts predict that the global consumption of vanadium will grow at a compound annual growth rate of 10.4% from 2010 to 2015, eventually reaching 115,000 tons. The vanadium industry has great potential for development. [0003] There are about 65 types of vanadium-c...

AI Technical Summary

Problems solved by technology

Disadvantages: The high temperature zone is too short, and the residence time of roasted materials in the high temperature zone is short, resulting in low energy utilization, large investment, high energy consumption, and difficult control of roasting temperature, which needs to be adjusted and controlled by pre-decarbonization

This kiln has the advantages of easy control of roasting temperature, time and atmosphere, etc., but requires a large flat land, large construction investment, high energy consumption, and high-quality fuel such as natural gas or coal gas. In addition, bricks are all manually operated, and the labor intensity is relatively high. Big

[0015] The flat kiln technology is backward, which belongs to the category of industrial structure adjustment, elimination or restriction; the fluidized roasting furnace is restricted by the high smoke rate and the short residence time of the smoke in the furnace; there are no examples of multi-hearth furnaces applied to stone coal roasting, mainly The unit productivity of the hearth furnace is low and the investment is large, but it has not been put into practice; the problem of the rotary kiln is that it is difficult to control the temperature during roasting; the large investment and high energy consumption of the step-by-step roasting kiln hinder the application in industry

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