Sintering prevention vanadium-containing stone coal microwave roasting method

Abstract

The invention relates to a sintering prevention vanadium-containing stone coal microwave roasting method. According to the technical scheme, the method includes: crushing vanadium-containing stone coal into coarse-grained vanadium-containing stone coal with the grain size less than 6mm and greater than 1mm and fine-grained vanadium-containing stone coal with the grain size less than 1mm; adding water to the fine-grained vanadium-containing stone coal to be mixed according to the mass ratio of the fine-grained vanadium-containing stone coal to the water of 1:0.06-0.09 to produce small balls 3-8mm in grain size and drying the small balls; placing the dried small balls in an industrial microwave roasting device as bedding materials, placing the coarse-grained vanadium-containing stone coal on the bedding materials prior to microwave roasting, and cooling to indoor temperature to obtain vanadium-containing stone coal roasting materials, wherein the microwave roasting is characterized in that the temperature rate ranging from 25 DEG C/min to 55 DEG C/min is increased rapidly to the temperature rate ranging from 750 DEG C to 850 DEG C, 25-40 min constant-temperature microwave roasting is performed, and the industrial microwave roasting device is 2400 to 2500 MHz (megahertz) in frequency. With the method, sintering during microwave roasting of the vanadium-containing stone coal is obviously reduced, and the effect of microwave roasting is good.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction from stone coal. In particular, it relates to a sintering-proof microwave roasting method for vanadium-containing stone coal. Background technique [0002] Vanadium-containing stone coal is an important vanadium-containing resource unique to my country. Through the continuous efforts of scientific and technological workers and the growing scale of the vanadium extraction industry from stone coal, vanadium extraction from stone coal has become an extremely important part of the field of vanadium extraction. Most of the vanadium in stone coal is trivalent vanadium, and it often occurs in aluminosilicate minerals such as mica and illite in the form of isomorphism, which is relatively stable. The traditional sodium roasting-water leaching vanadium extraction process has been gradually replaced by the blank roasting-acid leaching and direct acid leaching processes that are currently becomi...

AI Technical Summary

Problems solved by technology

[0006] To sum up, microwave roasting of vanadium-containing stone coal can obtain a higher vanadium leaching rate in the leaching operation of vanadium-containing stone coal, but the sintering of materials will seriously affect the forward progress of the vanadium-containing stone coal microwave roasting process and its roasting. Effect

At present, there is no treatment method that can effectively reduce material sintering and give full play to the beneficial effect of microwave roasting.