Preparation and recovery of iron carbide from pyrite cinder using carburization-magnetic separation technology

Abstract

A new technique with carburization followed by magnetic separation is presented for the preparation of high-grade iron carbide from pyrite cinder to promote the high value-added utilization of pyrite cinder. The effects of carburizing temperature, carburizing time and Na 2 SO 4 dosage on carburized pellets were investigated, and the effects of Na 2 SO 4 dosage and grinding fineness on magnetic concentrate were carried out. The optimized process parameters were proposed as follows: carburizing at 650 °C for 180 minutes in CO-CO 2-H 2 gas mixtures, Na 2 SO 4 dosage of 9%, magnetic field intensity of 130 mT, and grinding fineness of 92.25% powder passing 0.025mm. The iron content, total carbon content, total iron and carbon content of magnetic concentrate were 82.62%, 5.60%, and 88.22%, respectively. The recovery rate of iron reached 88.67%. The behaviors and mechanisms of carburization, separation, and Na 2 SO 4 , were ascertained with optical microscopy, X-ray powder diffraction (XRD), and scanning electron microscope (SEM).

Unveiling High-Tech Metals in Roasted Pyrite Wastes from the Iberian Pyrite Belt, SW Spain

“…Tailings, for example, although also economically interesting, often show substantial spatial geochemical changes, grain-size gravity-driven segregations, as well as some enriched or depleted pseudo-horizontal alteration fronts [70][71][72][73]. Moreover, the mineralogical and textural features of the "morrongos" make them a material suitable for metal recovery by means of a wide range of possible mineral processing methods, including flotation, gravity separation, electrostatic separation, and/or magnetic processes [74][75][76]. Owing to the low abundance of refractory phases, such as sulfides, together with the high abundance of leachable minerals, including oxides, sulfates, and native metals, we suggest that the most promising metallurgical process could be hydrometallurgical metal extraction [77,78].…”

Green Technology‐Based Utilization of Refractory Siderite Ores to Prepare Electric Arc Furnace Burden

“…The traditional preparation of iron carbide involves a fluidized bed process, which only disposes high-grade iron ore. Owing to the low iron grade of siderite, the separation technology of iron minerals and gangue (magnetic separation process) is compulsory. However, the high separation efficiency of iron minerals and gangue often requires the agglomeration (such as pelletizing) of iron ore. [23] In this context, shaft furnace processes such as the natural gas-based MIDREX process [15] have been proven to be commercially successful in treating iron ore pellets. In view of the similarity between iron ore reduction and iron ore carburization, the shaft furnace approach is expected to suitably afford the carburization of siderite, which may lead to good prospects for commercial applications.…”

“…A description of the carburization process can be found in the literature. [23] In the study, a quartz tube (Φ40 Â 600 mm) filled with preheated pellets (45 g) was placed in a shaft furnace (Φ80 Â 1000 mm) for carburization in 60%CO:20%CO 2 :20% H 2 mixture gas with a flow rate of 1.5 L min À1 . N 2 gas at a flow rate of 1 L min À1 was used to protect the carburized pellets.…”

Advanced converter sludge utilization technologies for the recovery of valuable elements: A review

“…Compared with Na2O, the reduction of K2O is easier, which means that K2O may have a higher extraction rate than Na2O during the procedure of reduction. However, a large number of studies reported that K and Na in iron ore mainly exist in the form of KAlSi2O6 and NaAlSi2O6 [32][33][34].…”