A study of environmentally safe obtaining of molybdenum-based alloying material by solid phase extraction

Stanislav Hryhoriev,Alexander Katschan,Dmytro Stepanov,Anton Matiukhin,Vadim Ryzhkov,Artem Petryshchev,Andrey Andreev,Kristina Krupey,Nataliia Berenda,Yevheniia Manidina

doi:10.15587/1729-4061.2017.119498

Abstract

The study has determined an increase of the degree of thermal carbon extraction of the molybdenum oxide concentrate from 11 % to 97 % with an increase in the processing temperature from 873 K to 1373 K, respectively. A further rise in temperature to 1473 K led to a reduction in the degree of recovery to 89 %. The recovery products after treatment at 873–1073 K mostly consisted of MoO 2 with some Mo and Mo 2 C manifestations. Treatment at 1223–1473 K provided a predominance of Mo and Mo 2 C as to the oxide component. The microstructure of the recovery products was spongy and disordered with varying degrees of sintering, depending on the processing temperature. The alloying of R6M5 steel with the new molybdenum material in experimental industrial conditions provided an increase in the Mo uptake rate from 88.9 % to 95.0 % compared with the standard technology. Improvement of environmental safety is achieved by replacing carbon monoxide and aluminothermic melting of ferroalloy production of Mo with the latest methods of powder metallurgy.

Highlights

A STUDY OFSAFE OBTAINING OF оксидного молібденового концентрату в інтервалі 873–1473 K
In recent years, the demand for steel alloyed with rare and refractory elements, in particular Mo, has increased.Prices for the corresponding alloying materials in the world market tend to increase, too
Unlike pure Mo oxides, there are accompanying ore oxide impurities, including Ca, Si, Al, and Mg. They can significantly affect the processes of metallization as well as the phase composition and the microstructure of the recovery products. Research in this direction can provide a reduction in the Mo sublimation of oxide compounds during the heat treatment of molybdenum oxide concentrates and the subsequent use of a metallized alloying additive

Summary

A STUDY OF

SAFE OBTAINING OF оксидного молібденового концентрату в інтервалі 873–1473 K. MOLYBDENUM-BASED пінь відновлення 97 % досягнуто після обробки при 1373 K із переважанням у фазовому складі Mo. Мікроструктура – ALLOYING MATERIAL BY SOLID PHASE EXTRACTION губчаста розупорядкована. S. Hryhoriev Doctor of Technical Sciences, Professor ною вуглецевосиліко- та алюмотер- Department of business administration and international management*

Introduction

Literature review and problem statement

Findings

Conclusions