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Acidic ammonium salt vanadium precipitation waste water recycling method

A technology for acidic ammonium salt vanadium precipitation and resource utilization, which is applied in the field of resource utilization of acidic ammonium salt vanadium precipitation wastewater, can solve the problems of high cost, complicated operation, and increased production cost of vanadium oxide, achieve qualified quality, and improve system yield , The clinker dipping process is smooth

Active Publication Date: 2015-10-21
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires multiple treatments of wastewater before it can be used in the leaching process. The operation is complicated and the cost is high.
[0006] Patent 102531221A mainly discloses the treatment method of vanadium precipitation wastewater, using a reducing agent to reduce the V of the wastewater 5+ 、Cr 6+ Reduce to low-priced vanadium chromium, adjust the pH value to alkaline, low-priced vanadium chromium is precipitated from the solution in the form of hydroxide and recovered; the main components of the mother liquor are sodium sulfate, ammonium sulfate, sodium chloride, ammonium chloride etc., with a salinity of about 10%, it is concentrated into a saturated solution of sodium sulfate through a multi-effect evaporation and concentration system, and mixed salts such as sodium sulfate and ammonium sulfate are precipitated, and the steam generated during the evaporation and concentration process forms condensed water, which is used as the leaching of clinker Washing water, thereby solving the problem of wastewater treatment and realizing zero discharge of wastewater, but using this method, the treatment cost per ton of wastewater is about 90 to 100 yuan, and the production of vanadium oxide produces about 26 to 28 tons of wastewater per ton, resulting in The production cost of vanadium oxide has increased significantly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 500g of vanadium extraction residue as the sand filter medium, mix 10L of waste water with 150L of condensed water evenly after sand filter pretreatment, take 1L of the mixed solution and heat it to 90°C; take 475g of vanadium slag powder containing 8% vanadium, 120g of sodium carbonate, sand The filtered vanadium extraction residue 470g is mixed evenly, the temperature is programmed to rise (6°C / min), the maximum roasting temperature is 780°C, and the roasting time is 150min. The clinker obtained by roasting is soaked with the prepared mixed solution for 30min. Add 1.5g of calcium chloride to the vanadium-containing leach solution to remove P, add 50g of ammonium sulfate to precipitate vanadium, and the final pH of the precipitation is 2.0. After testing, the TV of the residue is 1.02%, the SV is 0.08%, and the vanadium transfer leaching rate is 88.0%. The TV content in APV is 49.2%, the Na content is 0.36%, and the S content is 0.24%, all of which meet the technic...

Embodiment 2

[0038] Take 500g of vanadium extraction residue as sand filter medium, 10L of waste water is pretreated by sand filter and mixed evenly with 100L of condensed water, take 1L of mixed solution and heat to 90°C; take 475g of vanadium slag powder containing 8.3% vanadium, 120g of sodium carbonate, sand The filtered vanadium extraction residue 470g is mixed evenly, the temperature is programmed to rise (7°C / min), the maximum roasting temperature is 780°C, and the roasting time is 150min. The clinker obtained by roasting is soaked with the prepared mixed solution for 30min. Add 1.7g of calcium chloride to the vanadium-containing leaching solution to remove P, add 45% ammonium sulfate to precipitate vanadium, and the final pH of the precipitation is 2.0. After testing, the TV of the residue is 1.01%, the SV is 0.09%, and the vanadium transfer leaching rate is 88.3%. The TV content in APV is 48.8%, the Na content is 0.41%, and the S content is 0.26%, all of which meet the technical co...

Embodiment 3

[0040] Take 500g of vanadium extraction residue as sand filter medium, 10L of waste water is pretreated by sand filter and mixed evenly with 70L of condensed water, take 1L of mixed solution and heat to 90°C; take 475g of vanadium slag powder containing 8.4% vanadium, 120g of sodium carbonate, sand The filtered vanadium extraction residue 470g is mixed evenly, the temperature is programmed to rise (7°C / min), the maximum roasting temperature is 780°C, and the roasting time is 150min. The clinker obtained by roasting is soaked with the prepared mixed solution for 30min. Add 1.8g calcium chloride to the vanadium-containing leaching solution to remove P, add 47% ammonium sulfate to precipitate vanadium, and the pH value at the end of precipitation is 2.0. After testing, the TV of the residue is 1.02%, the SV is 0.09%, and the transfer rate of vanadium is 87.8%. ; The TV content in the APV is 48.6%, the Na content is 0.49%, and the S content is 0.28%, which all meet the technical co...

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Abstract

The invention relates to an acidic ammonium salt vanadium precipitation waste water recycling method, belongs to the field of metallurgy and aims to provide the acidic ammonium salt vanadium precipitation waste water recycling method. The acidic ammonium salt vanadium precipitation waste water recycling method comprises the following steps: a, partial ammonium salt vanadium precipitation waste water is subjected to vanadium-extraction tailing sand filtration, so that filtrate A is obtained; the rest ammonium salt vanadium precipitation waste water is subjected to heating evaporation concentration treatment, and after produced steam is cooled, condensate water is obtained; b, the filtrate A is mixed with condensate water, so that a mixed solution is obtained, and is returned to a vanadium extraction process. Compared with the conventional waste water treatment process, the method provided by the invention reduces waste water yield, reduces waste water treatment cost, recycles fine particles APV in the waste water and improves the system efficiency.

Description

technical field [0001] The invention relates to a resource utilization method of acidic ammonium salt vanadium precipitation wastewater, which belongs to the field of metallurgy. Background technique [0002] At present, there are two main production processes of vanadium oxide in the world. The raw materials include vanadium slag obtained from vanadium-containing minerals, vanadium-containing stone coal, spent catalysts, and petroleum cinders. One process is calcification roasting-acid leaching-hydrolysis vanadium precipitation (lime method for short). Another process is sodium roasting-leaching-ammonium salt precipitation vanadium (sodium salt method for short), the vanadium products produced by this process are of high quality and stable production. [0003] In the process of vanadium extraction by sodium salt method, vanadium needs to realize two transformations, one is the transformation of water-insoluble low-valence vanadium and water-soluble high-valence vanadium, a...

Claims

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Application Information

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IPC IPC(8): C02F9/10C22B7/00C22B34/22C02F103/16
Inventor 万龙飞李千文彭一村
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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