Recovery of iron from waste slag of pyrite processing using reduction roasting magnetic separation method

Abstract

A considerable amount of waste slag from the pyrite roasting process is produced every year. Recovery of iron from the waste slag is of great interest for maximum use of mineral resource, reduction of environment impact and improvement of economical benefits to the related companies. The objectives of the present work are focused on: compare various options for recovery of iron from the waste slag and select the most advantageous option for industrial trial which is roasting of the waste slag under reducing condition followed by magnetic separation; investigate the optimum conditions for maximum recovery of iron from the waste slag. The experimental results show that under the treatment condition in this work about 70% of the iron was recovered from the waste slag, where the iron content in the concentrate is 57%. After the further treatment with chlorinated segregation-magnetic separation, the iron content in the recovered slag can reach 83%. After the treatment, sulphur content in the concentrate was reduced significantly and gangue materials, such as SiO 2 , Al 2 O 3 and TiO 2 , were reduced effectively. This paper is mainly focused on the results of reduction roasting-magnetic separation.À chaque anné e, on produit une quantité importante de dé chets de scorie provenant du procé dé de grillage de la pyrite. La ré cupé ration du fer des dé chets de scorie est d'un grand inté rê t pour l'utilisation maximale de la ressource miné rale, pour la ré duction de l'impact sur l'environnement et pour l'amé lioration des bé né fices é conomiques des compagnies associé es. Les objectifs de ce travail sont centré s sur: la comparaison des diverses options de ré cupé ration du fer à partir des dé chets de scorie et la sé lection de l'option la plus avantageuse pour un essai industriel incluant le grillage des dé chets de scorie avec ré duction, suivi par la sé paration magné tique; l'examen des conditions optimales d'une ré cupé ration maximale du fer à partir des dé chets de scorie. Les ré sultats expé rimentaux montrent qu'avec les conditions du traitement au cours de ce travail, on a ré cupé ré environ 70% du fer à partir des dé chets de scorie, où la teneur en fer dans le concentré é tait de 57%. Aprè s un traitement additionnel par sé gré gation chloré e-sé paration magné tique, la teneur en fer dans la scorie de recouvrement pouvait atteindre 83%. Aprè s le traitement, la teneur en souffre dans le concentré é tait ré duite significativement et les maté riaux de la gangue, comme le SiO 2 , l'Al 2 O 3 et le TiO 2 , é taient effectivement ré duits. Cet article se concentre principalement sur les ré sultats du grillage ré ducteur et sé paration magné tique.

Extraction of Cobalt and Iron from Refractory Co-Bearing Sulfur Concentrate

“…Figure 11 shows that with the decrease of coke particle size, the grade of cobalt increased, and the recovery of cobalt increased first and then decreased. In the process of segregation roasting, the reductant can adjust the atmosphere for chloride separation and absorb and reduce the volatile metal chloride [19,20]. Figure 10 reveals that the solid reducing agent was mainly used for coke, lignite, anthracite, bituminous coal, and charcoal, among which coke was most commonly used.…”

Recovering Iron from Iron Ore Tailings and Preparing Concrete Composite Admixtures

“…Recently, a method involving direct reduction followed by magnetic separation has been used to recover iron from red mud, vanadium tailings, pyrite slag, copper slag, cyanide tailings, and IOTs [14][15][16][17][18][19]. This method has the advantage of high iron recovery, and is especially suitable for ore with a low iron grade.…”

Synthesis and properties of ferrimagnetic glass‐ceramics and glass fibers derived from pyrite slag

“…Zhihui Sui prepared inorganic polymer flocculant polysilicate ferric using pyrite slag as raw materials and used as flocculant in the treatment of tanning wastewater . Zhang recovered iron from waste slag of pyrite processing using reduction roasting magnetic separation method …”