Method for extracting vanadic anhydride from stone coal vanadium ore

Abstract

The invention relates to a method for extracting vanadic oxide from bone coal vanadium mine; the method comprises the following steps that the bone coal vanadium mine is selected to be delivered into a kiln for baking and the kiln temperature is controlled between 750 to 1100 Celsius degrees and the discharge temperature of the baked material is 750 to 1000 Celsius degrees; and then the materials are delivered into a heat-preservation warehouse to be kept still for 24 to 120 hours; and then the material is extracted and the pH value of the obtained extraction liquid is adjusted to be 2.5; the liquid is absorbed and desorbed to obtain the desorption liquid and then the desorption liquid is purified and the silicon and phosphor in the desorption liquid is removed; ammonium chloride is added to precipitate vanadium and obtain ammonium meta-vanadate; the ammonium meta-vanadate is implemented with the process of pyrolysis to obtain the vanadic oxide. The beneficial effect of the invention is that the bone coal vanadium mine is directly baked which reduces the working procedures of baking, proportioning, ball grinding and balling; the invention adopts the heat-preserving warehouse for preserving heat and the extraction rate can reach more than 90 percent if the temperature is kept between 750 to 1100 Celsius degrees for more than 72 hours; the extraction rate is higher if the heat-preserving time is longer; moreover, the mechanization degree is high and no dust pollution exists.

Description

technical field [0001] The invention relates to the rare nonferrous metal metallurgy industry, in particular to a method for extracting vanadium pentoxide from stone coal vanadium ore. Background technique [0002] The traditional process of extracting vanadium pentoxide from stone coal vanadium ore has been completely eliminated at present due to the serious pollution of roasting flue gas and waste water, low recovery rate and high production cost. Now the process of extracting vanadium pentoxide from stone coal vanadium ore is mainly There are several ways: [0003] (1) Raw ore (that is, stone coal vanadium ore) is directly ball milled, using 15-25% sulfuric acid, controlling the temperature above 90°C, and adopting high-acid high-temperature leaching. For extracting vanadium, use ammonia water to adjust the pH value of the stripping solution to 2, and then heat and deposit vanadium to obtain ammonium vanadate products. The production example is Shanyang Vanadium Industry...

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Problems solved by technology

However, this process has the following disadvantages: ① serious dust pollution in the workshop; ② the furnace temperature requirement is 750°C-850°C, the furnace temperature requirement is relatively strict, the furnace temperature range is narrow, it is difficult to control, the production index is unstable, and the industrial production is the highest. The rate can reach 88%, and the low one is only 50%; ③The four sides of the heap leaching field and the bottom of the heap are incompletely leached, resulting in a low leaching rate; ④The consumption of sulfuric acid is large, and the used sodium carbonate and lime are all alkaline reagents. When the roasting reaction is incomplete, sulfuric acid can be consumed quantitatively, especially when the furnace temperature is low, the consumption of sulfuric acid will double, and 15-20 tons of sulfuric acid will be consumed per ton of refined vanadium; ⑤The production cost is still relatively high

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