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A kind of method preparing sodium ammonium vanadate by sodium vanadate solution

A technology of sodium ammonium vanadate and sodium vanadate, which is applied in chemical instruments and methods, vanadium compounds, electrolytic components, etc., can solve problems such as difficult control of sodium ammonium vanadate products, and achieve good application prospects, high-efficiency utilization, and preparation The effect of mild conditions

Active Publication Date: 2021-08-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the vanadate ions have different polymerization states at different pH, and with the NH 4+ and Na + Different concentrations present different sodium ammonium vanadate products, so it is difficult to control and obtain qualified sodium ammonium vanadate products

Method used

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  • A kind of method preparing sodium ammonium vanadate by sodium vanadate solution
  • A kind of method preparing sodium ammonium vanadate by sodium vanadate solution

Examples

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Effect test

Embodiment 1

[0050] The sodium vanadate solution obtained by leaching the vanadium slag with sodium roasting water is used as the anolyte, the anolyte composition is: Na80g / L, V 30g / L; the catholyte composition: NaOH 200g / L. The anolyte and catholyte are respectively added to the anode chamber and the cathode chamber of the two-chamber electrolytic cell for electrolysis. The two chambers are separated by a DuPont N117 cation exchange membrane. The stainless steel electrode is used as the electrolysis anode, and the nickel electrode is used as the electrolysis cathode. At 20°C, current density 1200A / m 2 Under the conditions of electrolysis for 8 hours, after the electrolysis is completed, the NaOH solution in the cathode chamber is concentrated and then transferred out for leaching vanadium raw materials. Transfer the anode chamber solution out and add ammonia water to react to obtain precipitation, and control the NH 4+ The molar ratio with V, ie N:V is 3:1. After the reaction is complet...

Embodiment 2

[0054] The sodium vanadate solution obtained by direct pressure leaching of vanadium slag sodium through NaOH solution is used as the anolyte, the anolyte composition is: Na 70g / L, V 28g / L; the catholyte composition: NaOH 160g / L. Add anolyte and catholyte to the anode chamber and cathode chamber of the three-chamber electrolytic cell for electrolysis respectively. The two chambers are separated by DuPont 2050 cation exchange membrane. The ruthenium-plated titanium electrode is used as the electrolytic anode, and the nickel electrode is used as the electrolytic cathode. At 10°C, the current density is 1120A / m 2 Under the conditions of electrolysis for 7 hours, after the electrolysis is completed, the NaOH solution in the cathode chamber is concentrated and then transferred out for leaching vanadium raw materials. Transfer the anode chamber solution out and add ammonia water to react to obtain precipitation, and control the NH 4+ The molar ratio with V, ie N:V is 1:1. After th...

Embodiment 3

[0058] The sodium vanadate solution obtained by water leaching after vanadium-titanium magnetite sodium roasting is used as the anolyte, the anolyte composition is: Na 60g / L, V 22g / L; the catholyte composition: NaOH 120g / L. The anolyte and catholyte are respectively added to the anode chamber and the cathode chamber of the two-chamber electrolytic cell for electrolysis. The two chambers are separated by DuPont 2050 cation exchange membrane. The stainless steel electrode is used as the electrolysis anode, and the carbon steel electrode is used as the electrolysis cathode. At 10°C, current density 1000A / m 2 Under the conditions of electrolysis for 6 hours, after the electrolysis is completed, the NaOH solution in the cathode chamber is concentrated and then transferred out for leaching vanadium raw materials. Transfer the anode chamber solution out and add ammonia water to react to obtain precipitation, and control the NH 4+ The molar ratio with V, ie N:V is 4:3. After the rea...

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Abstract

The invention relates to a method for preparing sodium ammonium vanadate from a sodium vanadate solution. The method is as follows: using the sodium vanadate solution as an anolyte at 700-1200A / m 2 Perform ion-membrane electrolysis under the current density; transfer out the solution obtained from the anode after electrolysis, add ammonia water, react to obtain precipitation, and obtain sodium ammonium vanadate after solid-liquid separation. The present invention uses deep electrolysis to convert sodium vanadate solution into sodium polyvanadate, and prepares sodium ammonium vanadate with a purity greater than 99% through subsequent operations; sodium ammonium vanadate can be directly obtained without adding any chemical preparations The product, NaOH by-product of electrolysis can be recycled, and the anolyte can also be recycled after deammonization. O obtained by electrolysis 2 and H 2 After being properly collected, it can be used as an oxidant for leaching vanadium raw materials and a reducing agent for preparing low-valent vanadium oxides. The invention has simple process, mild preparation conditions, easy operation and good application prospect.

Description

technical field [0001] The invention relates to the field of vanadium product preparation, in particular to a method for preparing sodium ammonium vanadate from a sodium vanadate solution. Background technique [0002] Vanadium is an important metal element, widely used in steel, chemical industry, aerospace, electronic technology and other fields. Because vanadium is a polyvalent metal, it is often used as a catalyst for redox reactions in the chemical and petroleum industries. Vanadium plays an important role as a catalyst in the process of sulfuric acid, polyvinyl chloride, polystyrene, synthesis of acetic acid, oxalic acid, benzoic acid, phthalic acid, cracking in the petroleum industry, and polymerization of ethylene and propylene. Sodium ammonium vanadate is a commonly used desulfurization and denitrification catalyst in the chemical industry, and an important catalyst raw material for the Stretford and Sulfolin processes in the desulfurization industry. [0003] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00C25B1/16C25B1/04
CPCC01G31/006C01P2002/72C01P2006/80C25B1/04C25B1/16C25B9/73Y02E60/36
Inventor 刘彪杜浩王少娜郑诗礼潘博王欣然
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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