Federal State Unitary Enterprise “Special Design and Technological Bureau “Technolog”, Saint Petersburg, Russia

E. K. Ilves, Senior Specialist of the Quality Control Department, e-mail: ilves1997@mail.ru

Saint Petersburg State Institute of Technology (Technical University), Saint Petersburg, Russia

A. A. Blokhin, Head of the Department of Technology of Rare Elements and Nanomaterials Based on Rare Elements, Doctor of Technical Sciences, Professor, e-mail: blokhin@list.ru
Yu. V. Murashkin, Associate Professor of the Department of Technology of Rare Elements and Nanomaterials Based on Rare Elements, Candidate of Chemical Sciences, e-mail: murashkin-1@mail.ru

R&D Center JSC Rusredmet Group of Companies, Saint Petersburg, Russia
A. M. Chemekov, Deputy Head of the Analytical Laboratory, e-mail: achemekov@rusredmet.ru

The article describes the possibility of processing ferriferous solid waste after vanadium production by grinding, sintering with sodium carbonate, leaching the cake with water, separating chromium from the solution in the form of chromium(III) hydroxide by treating the carbonate solution with a reducing agent, neutralizing and acidifying the solution, extracting vanadium by sorption on a weak base anion exchange resin, desorbing vanadium with a solution of sulfuric acid, neutralization of the strippant with an ammonia solution, evaporation of the solution and isolation of vanadium from it in the form of ammonium vanadate. It has been found that in order to transfer at least 95% of vanadium contained in the waste into the solution, the waste should be pre-crushed to a fraction of –0.1 mm, dosage of Na₂CO₃ during sintering should be 100% of weight of ferriferous cakes, and sintering should be carried out at 800 ^оC. A main component transferring to the solution together with vanadium is chromium. It is proposed to carry out selective reduction of chromium(VI) by the action of hydrazinium hydrogen sulfate or sodium dithionite combined with simultaneous isolation of the resulting precipitate of chromium(III) hydroxide directly in carbonate leachate solutions. It has been shown that the efficient sorption of vanadium is when carbonate solutions are acidified to pH 3.0–4.5, and Purolite A100 and Purolite A111 weak base anion exchange macroporous resins on styrenic polymer matrix are used as sorbents. It has been found that solutions of sulfuric acid can be used to desorb vanadium from the weak base anion exchange resins. The rate of vanadium precipitation in the form of ammonium vanadate from strippants neutralized with an ammonia solution and upgraded by evaporation approximately by twice reaches 99%.
The research was funded by the grant of the Russian Science Foundation (project No. 21-79-30029).

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