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Ammonia-free vanadium precipitation method for acidic vanadium-rich solution

A solution and acidic technology, applied in the field of hydrometallurgy, to achieve the effect of improving the total recovery rate, saving investment and reducing energy consumption

Inactive Publication Date: 2020-04-10
杨秋良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The problem to be solved by the present invention is to solve the discharge of ammonia-nitrogen waste water and ammonia-containing toxic waste gas from the source, without disturbing the environment

Method used

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  • Ammonia-free vanadium precipitation method for acidic vanadium-rich solution

Examples

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Embodiment 1

[0024] A production enterprise with an annual output of 2,500 tons of vanadium pentoxide, using vanadium-containing stone coal as raw material, adding fluorite as a leaching agent, using dilute sulfuric acid as a leaching agent, heating with steam, stirring and leaching in a leaching tank for 2 hours, filtering, acid leaching The liquid is adjusted by calcium carbonate powder, extracted by P204+TBP+white oil solvent, back-extracted with dilute acid, and the back-extracted solution V 2 o 5 Content 80-90% g / L, sulfuric acid concentration 3-5%. The original vanadium precipitation process: use sodium chlorate as an oxidant to completely oxidize vanadium, adjust the pH value to about 2.0 with ammonia water, and heat the vanadium precipitation. Vanadium precipitation mother liquor contains V 2 o 5 1.0-1.5g / L, add lime to adjust the pH value to 7-8 for filtration, adjust the pH value of the filtrate to 11, and enter the ammonia distillation system to distill ammonia to recover dil...

Embodiment 2

[0027] Embodiment 2: a vanadium-containing steel slag extracting vanadium enterprise, using V-containing 2 o 5 16-25% vanadium-containing steel slag is used as raw material. The original process is to add soda ash and sodium chloride to the rotary kiln roasting slag ball mill to extract vanadium in water, and the water leaching solution is adjusted with sulfuric acid. p H value to about 2.0, press V 2 o 5 1.5 times the amount of ammonium sulfate is added to heat and precipitate vanadium to produce ammonium polyvanadate. Technical transformation due to environmental failure.

[0028] Vanadium-containing steel slag is not roasted and ball milled to -120 mesh, heated and stirred with sulfuric acid for leaching, and the V 2 o 5 Enrich to above 40g / L, control the concentration of sulfuric acid below 5%, add sodium chlorate to oxidize at 0.24 times the total amount of low-priced vanadium until the vanadium is completely oxidized, and use per m 2 Add polymerized polyvanadate 10...

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Abstract

The invention belongs to the field of hydrometallurgy, and particularly relates to an ammonia-free vanadium precipitation method for an acidic vanadium-rich solution. The method comprises the following steps of 1) controlling the concentration of sulfuric acid in the acidic vanadium-rich solution at 1% to 10%, adding an oxidizing agent until vanadium is completely oxidized, adding a certain amountof polymeric polyvanadate as a seed crystal, introducing CO2 for heating to precipitate vanadium, carrying out heat preservation, and carrying out vanadium precipitation and complete filtration; and(2) introducing CO2 into filter residues for washing and filtering by using a 0.5% to 5% sulfuric acid aqueous solution under the conditions of heating and stirring, leaching and washing the washed and filtered residues by using clear water, and firing to obtain industrial vanadium pentoxide. The method has the beneficial effects that by adopting the method of ammonia-free precipitation, vanadiumprecipitation is complete, emission of ammonia-nitrogen wastewater and ammonia-containing toxic waste gas is solved from the source, and environment-friendly disturbance is avoided.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for the ammonia-free precipitation of vanadium in an acidic vanadium-rich solution. Background technique [0002] Acidic vanadium-enriched solution refers to acid leaching vanadium acidic solution separated and enriched by solvent extraction, dilute sulfuric acid back-extracted sulfuric acid stripping solution or vanadium-containing high-grade material is acid leached, solid-liquid separation containing V 2 o 5 Vanadium-rich acidic solution greater than 20g / L, the acidic vanadium-rich solution contains V 2 o 5 Generally at 20g / L-120g / L, the conventional vanadium precipitation process is to add an oxidant to the acidic vanadium-rich solution to oxidize the vanadium completely, use ammonia water or ammonium bicarbonate to adjust the alkali, control the pH value of the acidic vanadium-rich solution at about 2.0, and heat Precipitating vanadium to produce polyme...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B34/22C01G31/02
CPCC01G31/02C22B3/44C22B34/22Y02P10/20
Inventor 杨秋良
Owner 杨秋良
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