Roasting method for extracting vanadium from vanadium-containing shale

Abstract

The invention relates to a roasting method for extracting vanadium from vanadium-containing shale. According to the technical scheme of the invention, the method comprises the following steps of: uniformly mixing vanadium-containing shale raw ore with a vanadium-containing shale extraction roasting additive in a ratio of 1:(0.06 to 0.1), feeding the mixture to a roasting furnace, heating to 850 to 1000 DEG C at a temperature rise rate of 400 to 500 DEG C/h, maintaining the temperature for 1 to 2 hours, then adding the roasted product to dilute sulfuric acid with volume fraction of 4 to 10% in a solid-liquid mass ratio of 1:2, and leaching at 90 to 100 DEG C for 0.5 to 1 hour under the condition of stirring. The preparation method of the vanadium-containing shale extraction roasting additive comprises the steps of: preparing Mg compounds, namely NaClO3, Na2CO3 and CaCO3 and mixing uniformly, wherein the mass ratio of NaClO3:Na2CO3:CaCO3 is 1:1:(4 to 8):(6 to 10); and grinding until the particle size is not more than 0.15 mm. The method provided by the invention increases the leaching rate up to 86% to 87% and has the characteristics of high recovery rate, short roasting period, high leaching speed and little roasting pollution.

Description

technical field [0001] The invention belongs to the field of extracting vanadium from vanadium-containing shale, and in particular relates to a roasting method for extracting vanadium from vanadium-containing shale. Background technique [0002] Vanadium-bearing shale is a unique vanadium resource in my country, with extremely rich reserves; extracting V from vanadium-bearing shale 2 o 5 It is one of the important ways for my country to obtain vanadium. The occurrence state of vanadium in vanadium-bearing shale is mostly in mica minerals in a stable trivalent state, which is insoluble in water and acid. It is difficult to extract vanadium from this type of vanadium-bearing shale. Roasting is required to convert vanadium from trivalent to soluble tetravalent or pentavalent. The existing roasting vanadium extraction methods are divided into the following four methods: [0003] 1. Roasting without additives [0004] The feature of this process is that no additives are added...

AI Technical Summary

Problems solved by technology

This method consumes a large amount of acid and has a high concentration, which brings great difficulties to the later wastewater treatment.

[0013] "Roasting additive for extracting vanadium pentoxide from vanadium-containing stone coal and its application method" (CN101492775A) discloses a barium compound, metal barium powder or barium flux that accounts for 0.5% to 2% of the weight of vanadium-containing shale ore, or Add Na 2 CO 3 and CaCO 3 One of them, because barium is a toxic heavy metal, especially barium chloride is highly toxic, the lethal dose is 0.8-0.9g, so barium-containing dust poses a serious threat to the health of workers, and the wastewater after leaching also contains Barium ions are highly polluting to the environment and difficult to handle, so it is not suitable to use barium or its compounds as roasting additives