Non-ammonia molybdenum precipitation method for sodium-modifying vanadium-rich liquor

A technology of sodiumization and vanadium solution is applied in the field of sodium vanadium-rich solution without ammonia for vanadium precipitation, which can solve the problems of non-recyclable use, low product content, increase investment in infrastructure equipment, etc., and achieve the effect of saving investment.

Inactive Publication Date: 2020-04-17
杨秋良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low product content of hydrolysis vanadium precipitation, the red cake obtained by hydrolysis vanadium precipitation is used in industry, and the alkali-soluble ammonium salt precipitation vanadium is refined to obtain qualified vanadium products. The above vanadium precipitation processes need to add ammonia salt to obtain qualified vanadium products , produces a large amount of ammonia-nitrogen wastewater, the vanadium precipitation mother liquor cannot be recycled, and needs to be neutralized by adding lime for ammonia distillation and deammoniation to reuse the process, which increases the investment in infrastructure equipment, and the vanadium in the vanadium precipitation mother liquor cannot be recovered, resulting in the loss of vanadium. The cost of sinking vanadium is high, but once there is a great environmental hazard

Method used

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  • Non-ammonia molybdenum precipitation method for sodium-modifying vanadium-rich liquor
  • Non-ammonia molybdenum precipitation method for sodium-modifying vanadium-rich liquor

Examples

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Embodiment 1

[0030] With an annual output of 3,000 tons of vanadium pentoxide, a vanadium-containing stone coal vanadium extraction enterprise uses barium salt oxidation roasting, dilute sulfuric acid leaching, and N235 solvent for acid extraction and soda ash back extraction. The back extraction solution contains V 2 o 5 Adjust the pH value to 7-8 with 50-60g / L sulfuric acid, add calcium chloride and aluminum sulfate solution to purify, remove silicon and dephosphorize, and filter the filtrate according to V 2 o 5 Add 1.5-2 times the amount of ammonium chloride to precipitate vanadium. Vanadium precipitation mother liquor contains V 2 o 5 Generally 1.0-1.5g / L, add lime to neutralize until the pH value is greater than 11 and filter, and the filtrate enters the ammonia distillation system to distill ammonia to recover dilute ammonia water. Due to the large loss of vanadium, the high operating cost of ammonia distillation, and the lack of sales of dilute ammonia water, the ammonia-free v...

Embodiment 2

[0035] Annual output V 2 o 5 2,500 tons of vanadium-containing steel slag vanadium extraction enterprises, using low-grade vanadium (V 2 o 5 content 2.5-3.5%) steel slag, adopt calcification and chlorination roasting, dilute sulfuric acid leaching process, acid leaching solution is extracted with N235 as solvent, loaded organic phase is back-extracted with sodium carbonate, and the back-extracted solution contains V2O560-80% g / L and adjusted with sulfuric acid The pH value is 7-8, add calcium chloride and aluminum sulfate to purify, remove silicon and dephosphorize and filter, adjust the pH value of the filtrate to 2.0 with sulfuric acid, press V 2 o 5 Add 1.5-2 times the amount of ammonium sulfate, and heat to precipitate vanadium. Vanadium precipitation mother liquor contains V 2 o 5 0.5-1.5g / L, adjust the pH value to 11 with lime and filter, and use air stripping method to remove ammonia. Due to the failure of environmental protection to meet the standards, the techn...

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Abstract

The invention relates to a non-ammonia molybdenum precipitation method for sodium-modifying vanadium-rich liquor. The non-ammonia molybdenum precipitation method comprises the following steps: 1) regulating the pH value of the sodium-modifying vanadium-rich liquor with sulfuric acid, and adding calcium chloride and an aluminum sulfate solution to purify, remove silicon, remove phosphine and filter; 2) regulating the pH value of the obtained purified filtrate with the sulfuric acid, adding the sulfuric acid, introducing CO2 under a stirring condition, adding certain polymer polyvanadic acid asseed crystal, heating to a temperature of 90 DEG C or higher, and preserving the heat for 1-2 hours until molybdenum precipitation is complete, and filtering; 3) adding an acidic ammonium sulfate solution into obtained filter residues, introducing CO2 under the stirring condition, and heating up to a boiling point for sodium removal and filtration, adding lime to treat and filter by supplementingammonium sulfate into filtrate to circulate by certain times, returning filtrate to a fine vanadium burning furnace, and spraying and absorbing ammonia gas released by fine vanadium burning, and recycling produced ammonium sulfate for sodium removal of polymer polyvanadic acid; and 4) washing the filter residues with a sulfuric acid aqueous solution and clear water to further produce vanadium pentoxide. The non-ammonia molybdenum precipitation method has the beneficial effects of solving emission of ammonia nitrogen wastewater from the source, and being environmentally friendly.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for vanadium-free precipitation of vanadium-rich liquid in sodium. Background technique [0002] At present, the recovery of vanadium in sodium-rich vanadium-rich liquid is mainly to add ammonium chloride to precipitate vanadium to produce ammonium metavanadate, or use sulfuric acid to adjust the pH value to about 2.0, add ammonium sulfate to heat and precipitate vanadium to produce ammonium polyvanadate. Due to the low product content of hydrolysis vanadium precipitation, the red cake obtained by hydrolysis vanadium precipitation is used in industry, and the alkali-soluble ammonium salt precipitation vanadium is refined to obtain qualified vanadium products. The above vanadium precipitation processes need to add ammonia salt to obtain qualified vanadium products , produces a large amount of ammonia-nitrogen wastewater, the vanadium precipitation mother liquor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/44C22B3/08C22B3/28
CPCC22B3/08C22B3/44C22B34/22C22B3/282Y02P10/20
Inventor 杨秋良
Owner 杨秋良
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