Torrefaction additive for extracting vanadium pentoxide from vanadium-containing bone coal and method of use thereof

A technology of vanadium pentoxide and application method, which is applied in the field of rare non-ferrous metal metallurgy, and can solve problems such as poor adsorption effect, poor ore adaptability, and large amount of slag

Inactive Publication Date: 2009-07-29
淅川县玉典钒业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this process has the following disadvantages: A. The furnace temperature is required to be at 750-850°C, the furnace temperature is strictly required, the furnace temperature range is narrow, it is difficult to control, the production index is unstable, and the highest conversion rate of industrial production can reach 90%. Only 50%; B, consumption of sulfuric acid is large, and every ton of refined vanadium needs 15-20 tons of sulfuric acid, and the production cost is high; C, when adding calcium carbonate or calcium hydroxide, it can effectively fix sulfur in the roasting process, but

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Select vanadium-containing stone coal and pulverize it to 80 meshes, control its fixed carbon content to 3.2%, add barium carbonate according to the amount of vanadium-containing stone coal ore at 0.8% (mass), mix, make small balls with a particle size of 15-25mm, and put it into flat The kiln was roasted at 1050 degrees for 6 hours, the slag grade was 1.284%, and the dilute sulfuric acid (wherein, the solid-to-liquid ratio of vanadium-containing stone coal slag and dilute sulfuric acid was 1:2, by mass) was soaked in a pool leaching method. Get the vanadium-containing stone coal through roasting, the pH value of the leach solution is 2.5, the acid-soluble vanadium is 11.38kg / T, and its transfer leaching rate is 88.62%. Concentration) sodium hydroxide is desorbed, the desorbed solution is purified, ammonium chloride is added to precipitate vanadium to obtain ammonium metavanadate, and pyrolyzed to obtain vanadium pentoxide. For the remaining steps of extracting vanadium...

Embodiment 2

[0076] Select the vanadium-containing stone coal to be pulverized to 80 meshes, control its fixed carbon content to 3.3%, add barium sulfate according to 1% (mass) of the vanadium-containing stone coal amount (mass), add sodium carbonate batching and mix with 1% (mass) of the vanadium-containing stone coal amount, and prepare Be into pellets with a particle diameter of 15-25mm, put it into a flat kiln for 800 degrees of roasting for 18 hours, the slag grade is 1.205%, and use 5% (mass percentage concentration) of soda ash (wherein, vanadium-containing stone coal slag and soda ash solid-liquid Ratio 1: 1, mass) take pool leaching mode to leaching the vanadium-containing stone coal through roasting, alkali-soluble vanadium 9.47kg / T, its transfer leaching rate 78.59%, all the other steps are the same as embodiment 1.

Embodiment 3

[0078] Select the vanadium-containing stone coal to be pulverized to 80 meshes, control its fixed carbon content to 3.4%, add barium carbonate according to 1.0% (mass) of the vanadium-containing stone coal ore amount, and add sodium carbonate batching and mix with 1.0% (mass) of the vanadium-containing stone coal ore amount to prepare Be into pellets with a particle diameter of 15-25mm, put it into a flat kiln for 12 hours at 900 degrees and roast it for 12 hours, the slag grade is 1.231%, and use 1.66% (mass percentage concentration) of dilute sulfuric acid (wherein, vanadium-containing stone coal slag and dilute sulfuric acid Solid-to-liquid ratio 1: 2, mass) take the pool leaching mode to leaching the roasted vanadium-containing stone coal, the pH value of the leaching solution is 2.5, the acid-soluble vanadium is 11.09kg / T, and the transfer leaching rate is 90.09%, and the remaining steps are the same as in Example 1 .

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Abstract

The invention relates to a roasted additive for extracting vanadic oxide in vanadium-containing stone coal and application method thereof. The additive comprises barium compounds, barium powder or barium solvent accounting for 0.5% to 2% of additive mine of vanadium-containing stone coal. The method comprises steps of mixing the barium compounds, or barium powder or barium solvent and vanadium-containing stone coal in an oven to roast, controlling temperature at 700 DEG C to 1050 DEG C, roasting for 6h to 72h, and leaching the obtained roasted dregs to recycle vanadium. Beneficial effect of the invention lies in that 1) the existing device is unnecessary to be changed or altered; 2) sulfur can be effectively fixed, and roasting smoke is less than national discharge standard; 3) furnace temperature range is wide and the furnace temperature is easy to control; 4) leaching ratio is high; 5) concentration of sulfuric acid for acid leaching is only 1% to 2%; 6) roasting dregs of the invention use dilute sulphuric acid to leach, thus acid consumption is low; 7) the cost of water leaching and acid leaching in the invention is low.

Description

technical field [0001] The invention relates to the metallurgical industry of rare nonferrous metals, in particular to a roasting additive for extracting vanadium pentoxide from stone coal containing vanadium and an application method thereof. Background technique [0002] The additive in the traditional roasting process for extracting vanadium pentoxide from vanadium-containing stone coal is sodium chloride with an ore content of 10.15%. Since sodium chloride decomposes to release chlorine gas and hydrogen chloride gas during high-temperature roasting, the roasting flue gas pollution is serious, and The recovery rate is low and the production cost is high, so it has been completely eliminated at present. The existing roasting additives for extracting vanadium pentoxide from vanadium-containing stone coal mainly include the following types: [0003] 1. Use 0.5-2% sodium chloride and 4% sodium carbonate as composite additives, and put it into flat kiln for roasting. The reco...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B1/02C01G31/02
Inventor 杨秋良赵哲曹建德
Owner 淅川县玉典钒业有限责任公司
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