Method for recycling vanadium and chromium from high-chromium low-vanadium vanadium precipitation wastewater

A technology for vanadium precipitation wastewater and high chromium, which is applied in chemical instruments and methods, metallurgical wastewater treatment, water pollutants and other directions, can solve the problems of complex operation control process, easy emulsification and the like, and achieve high vanadium yield and industrialized equipment. Simple, short process effect

Inactive Publication Date: 2012-02-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual operation and control process of this method is complicated, and the emulsified phase is easy to appear, so it is not suitable for the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 10L with V 5+ 0.32g / L, Cr 6+ 0.35g / L of vanadium precipitation wastewater (pH=2.54) is adsorbed with 80g D201 resin; after resin adsorption is completed, wash the resin with tap water to pH=6~7; Chromium resin, obtain 200ml desorption solution (containing washing water), concentration is V 15.42 / L, Cr 17.06g / L; Add ammonium chloride 16g and stir 150min precipitation ammonium metavanadate in desorption solution, filter to obtain chromium-containing solution, filter Dry the cake to obtain crude ammonium metavanadate; dissolve the crude ammonium metavanadate with 150ml of 90°C water at a constant temperature, filter, add 3g of ammonium chloride to the filtrate, stir and cool naturally to obtain ammonium metavanadate; Calcined in a muffle furnace at 500°C for 3h to deammoniate to obtain 5.12g of vanadium pentoxide, its V 2 o 5 The content is 99.14%, Cr 2 o 3 The content is 0.13%. Add 20 g of sodium metabisulfite to the chromium-containing solution, stir for 2 minutes,...

Embodiment 2

[0028] 4L with V 5+ 0.30g / L, Cr 6+ The vanadium precipitation wastewater (pH=3.2) of 1.62g / L is adsorbed with 100g D201 resin; After the resin adsorption is completed, wash the resin to pH=6~7 with tap water; Use 280ml desorbent (composition is 2%NaOH and 8%NaCl) Desorb the vanadium-chromium-containing resin to obtain 300ml of desorption solution (including flushing water) with a concentration of V 3.90 / L and Cr 21.06g / L; adjust the pH value of the desorption solution to 1.8 with concentrated sulfuric acid, add 2.5g of ammonium chloride and heat to 95 ℃, react under stirring conditions for 60 minutes, filter to obtain chromium-containing solution, and dry the filter cake to obtain crude ammonium polyvanadate; dissolve the crude ammonium polyvanadate with 100ml of 5% sodium hydroxide solution, filter, and adjust the desorption of the filtrate with concentrated sulfuric acid The pH value of the solution is 1.8, add 1.7g of ammonium chloride and heat to 95°C, react under stirrin...

Embodiment 3

[0030] 10L with V 5+ 0.30g / L, Cr 6+0.52g / L vanadium precipitation wastewater (pH=3.5) is adsorbed with 100g D201 resin; after the resin adsorption is completed, wash the resin with tap water to pH=6~7; Desorb the vanadium-chromium-containing resin to obtain 250ml of desorption solution (including flushing water) with a concentration of V 11.70 / L and Cr 20.28g / L; adjust the pH value of the desorption solution to 1.8 with concentrated sulfuric acid, add 4.5g of ammonium chloride and heat to 95 ℃, reacted under stirring conditions for 60min, filtered to obtain a chromium-containing solution, and dried the filter cake to obtain crude ammonium polyvanadate; dissolved the crude ammonium polyvanadate with 100ml of 10% sodium carbonate solution, filtered, and added 13.0g of chlorine to the filtrate Ammonium chloride was stirred for 60 minutes to precipitate ammonium metavanadate; ammonium metavanadate was calcined in a muffle furnace at 500°C for 3 hours to deammoniate to obtain 4.81...

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Abstract

The invention provides a method for recycling vanadium and chromium from high-chromium low-vanadium vanadium precipitation wastewater. The method comprises the following steps of: adsorbing the vanadium and the chromium in the vanadium precipitation wastewater by using ion exchange resin to obtain resin containing the vanadium and the chromium; desorbing the resin containing the vanadium and the chromium to obtain a desorption solution containing the vanadium and the chromium; performing vanadium precipitation treatment on the desorption solution to obtain coarse ammonium polyvanadate and a chromium-containing solution or obtain coarse ammonium metavanadate and the chromium-containing solution, adjusting the chromium-containing solution to be acid, performing reduction and neutralization treatment on the chromium-containing solution, and thus obtaining chromium residues; and dissolving the coarse ammonium polyvanadate by using a basic solvent, further precipitating the vanadium, and thus obtaining the ammonium polyvanadate or the ammonium metavanadate, or dissolving the coarse ammonium metavanadate in hot water to form a solution, adding ammonium salt into the solution, performing recrystallization, and thus obtaining qualified ammonium metavanadate. By the method, the vanadium and the chromium can be recycled and separated from the vanadium precipitation wastewater directly, and a qualified vanadium product can be obtained; and the method has the characteristics of short process, high vanadium yield, simple industrialization equipment and the like.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of vanadium and chromium, in particular to a method for recovering vanadium and chromium from high-chromium-low-vanadium precipitation wastewater. Background technique [0002] In the comprehensive recovery process of iron, vanadium and titanium using chromium-containing vanadium-titanium magnetite as raw materials, chromium is similar to vanadium in nature, and enters vanadium slag after blast furnace smelting and converter vanadium extraction process together with vanadium. Vanadium extraction plants at home and abroad mainly use sodium roasting and water leaching to extract vanadium. During the vanadium precipitation process in the leaching solution, vanadate and ammonium ions combine to form ammonium polyvanadate or ammonium metavanadate precipitation, and chromate or dichromate stays in the solution because it does not precipitate, and enters together with the incompletely pr...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/42C22B3/44C02F1/42C02F1/62C22B34/22C22B34/32C02F101/20C02F101/22C02F103/16
CPCY02P10/20
Inventor 付自碧尹丹凤高官金何文艺申彪李千文
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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