Method for extracting vanadium by calcining vanadium-containing stone coal powder in calciner and pickling

Abstract

The invention discloses a method for extracting vanadium by calcining vanadium-containing stone coal powder in a calciner and pickling, which comprises the following steps: 1) crushing stone coal, of which the calorific capacity is 800 kilocalories, into 60-mesh undersize which accounts for 85% or above; 2) uniformly feeding the stone coal obtained in the step 1) into a calciner, calcining at 800-1000 DEG C under a bottom wind pressure of 3000-6000pa, and mixing collected fine dust and cinder at an overflow port; 3) leaching the product collected in the step 2) with 20-25% (mass concentration) sulphuric acid, wherein the liquid-to-solid ratio is (1-1.5):1, the leaching temperature is 80-95 degrees, and the leaching time is 2-6 hours; and 4) after the leaching process is finished, carrying out solid-liquid separation to extract vanadium from the leach solution. According to the invention, the carbon content of stone coal can be effectively utilized; the secondary calcination process required for stone coal having high carbon content, including decarburization and oxidative calcination steps, is avoided; and the energy consumption in the secondary oxidative calcination process is avoided, thereby realizing the effective utilization of energy in stone coal.

Description

technical field [0001] The invention belongs to the field of pyrometallurgy, and in particular relates to a method for extracting vanadium from stone coal by roasting powdered stone coal in a roasting furnace and simultaneously completing the combustion of carbon in the stone coal and the oxidative roasting of vanadium in the stone coal. Background technique [0002] Stone coal is widely distributed in the central and southern regions of my country. In addition to carbon, stone coal also contains a certain amount of vanadium and other valuable elements. According to statistics, the vanadium content in my country's stone coal is about 7 times that in my country's vanadium-titanium magnetite, which is a rich vanadium-containing resource. my country's technical research on extracting vanadium from stone coal has begun in the 1970s, mainly adopting flat kiln roasting and water immersion technology, and the extraction rate of vanadium is about 50%. Continuous, the shortcomings of...

AI Technical Summary

Problems solved by technology

my country's technical research on extracting vanadium from stone coal has begun in the 1970s, mainly adopting flat kiln roasting and water immersion technology, and the extraction rate of vanadium is about 50%. Disadvantages of continuous, heavy worker workload

[0003] Due to the disadvantages of roasting stone coal in flat kilns, some enterprises currently use vertical kilns and tunnel kilns to roast stone coal, but they all need to burn the stone coal to remove part of the carbon, then crush it, shape it and roast it, and then enter the stage of crushing and leaching, resulting in process The process is prolonged, and the heat in the stone coal is not fully utilized, resulting in waste of energy