Method for gas-phase vanadium extraction by utilizing combustion of stone coals in cyclone furnace

Abstract

The invention provides a method for gas-phase vanadium extraction by utilizing combustion of stone coals in cyclone furnace. After stone coals are crushed, fuels are added, and ground to powder, and the additive fuels weigh 5%-15% of the stone coal raw material. The powder and air with an oxygen content of 21%-30% are sent to a cyclone furnace, gas-state vanadium pentoxide is generated and discharged along with furnace gas, formed ash slag adheres to a cylinder wall and forms liquid-state ash membranes, which are discharged through a kettle opening. Furnace gas is mixed with cool air, cooled, dedusted by cyclones and enriched in an electrostatic fabric filter. The enrichment objects are soaked by an alkali solution to obtain a vanadium-containing soaking solution. The dust in the furnace gas is sent to a secondary spray tower, and the gas-state vanadium pentoxide is dissolved in a vanadium-containing spray solution. Sulfuric acid or hydrochloric acid are added to the two vanadium-containing solutions, and vanadium pentoxide crude products are precipitated through acid neutralization. The temperature in the furnace is high, and low-valence-state vanadium can be oxidized and gasified fully. The cyclone furnace has high slag-capturing rate, and the burden of dedusting devices is light. The powder in the furnace is thrown onto slag membranes, the resistance time is long, and the continuity and sufficiency of combustion can be maintained.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to a method for extracting vanadium in gas phase by burning stone coal in a cyclone furnace. Background technique [0002] Vanadium is a global scarce resource and an important strategic material. It has excellent properties such as 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 vanadium is used in the steel industry. Adding 0.1% vanadium to steel can increase the strength by 10%-20%, reduce the weight of the structure by 15%-25%, and reduce the cost by 8%-10%. With the development of the steel industry in the direction of high-quality, refined and special, the application of high-quality vanadium steel is becoming more and more extensive. At present, the consumption intensity of vanadium in my country's iron and steel industr...

AI Technical Summary

Problems solved by technology

The traditional production process has the following disadvantages: additives (sodium salt, calcium salt, etc.) need to be added, and the dosage is large; harmful gases such as chlorine gas generated during the roasting process corrode the equipment and pollute the environment; the process is long, the equipment is large, and the investment is high.

However, using this method to extract vanadium, the temperature in the fluidized fluidized furnace is low, and the combustion of carbon in the stone coal and the oxidation and gasification of low-priced vanadium are not sufficient; the powder burns in a boiling state at a certain height in the furnace, and the fly ash is easily burned Gas entrainment increases the burden on the follow-up dust removal equipment, and solid slag discharge is adopted, and the unburned carbon is wrapped in the slag and discharged together; at the same time, due to the limitation of the structural characteristics of the fluidized fluidized furnace, the combustion time of the powder in the fluidized fluidized furnace is relatively short;