Separation and recovery of metallic zinc and iron concentrate from blast furnace dust by vacuum carbothermal reduction

Deng, Xue; Huang, Run; Lv, Xiaodong; Yang, Jingpiao; Yang, Jing

doi:10.1016/j.psep.2022.04.050

Cited by 23 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, domestic steel enterprises have regarded metallurgical dust generated in the steel production process as sintering raw materials to control the cost and reduce the pollution [ 8 , 9 ]. Metallurgical dust not only contains abundant Fe and C resources but also contains large amounts of harmful elements such as Zn [ 10 , 11 , 12 ]. The recycling of metallurgical dust by sintering increases the Zn content in the sinter.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Different Zn Forms on Sintering Basic Characteristics of Iron Ore

Ju,

Zu,

Xing

et al. 2024

Materials

View full text Add to dashboard Cite

The micro-sintering method was used to determine the sintering basic characteristics of iron ore with Zn contents from 0 to 4%, the influence mechanism of Zn on sintering basic characteristics of iron ore was clarified by means of thermodynamic analysis and first-principles calculations. The results showed that (1) increasing the ZnO and ZnFe2O4 content increased the lowest assimilation temperature (LAT) but decreased the index of liquid phase fluidity (ILF) of iron ore. The addition of ZnS had no obvious effect on LAT but increased the LIF of iron ore. (2) ZnO and ZnFe2O4 reacted with Fe2O3 and CaO, respectively, during sintering, which inhibited the formation of silico-ferrite of calcium and aluminum (SFCA). The addition of ZnS accelerated the decomposition of Fe2O3 in the N2 atmosphere; however, the high decomposition temperature limited the oxidation of ZnS, so the presence of ZnS had a slight inhibitory effect on the formation of SFCA. (3) The Zn concentrated in hematite or silicate and less distributed in SFCA and magnetite in the form of solid solution; meanwhile, the microhardness of the mineral phase decreased with the increase in Zn-containing solid solution content. As the adsorption of Zn on the SFCA crystal surface was more stable, the microhardness of SFCA decreased more. The decrease in microhardness and content of the SFCA bonding phase resulted in a decrease in the compressive strength of the sinter.

show abstract

Section: Introductionmentioning

confidence: 99%

The Effects of Different Zn Forms on Sintering Basic Characteristics of Iron Ore

Ju,

Zu,

Xing

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…For over a century, carbothermal reduction has long been recognized and used as a low-cost and mass-production chemical route for thermal decomposition and recovering valuable metals such as Ga, 17 Zn and Pb. 18,19 Moreover, in recent years, the CTR process has opened up a scalable way for synthesizing a large variety of low-dimensional metal oxide nanomaterials, such as ZnO and SnO2, for catalytic and electronic applications. [20][21][22] In general, the reduction of binary metal oxide in the presence of CO as a reducing agent can be demonstrated by the following reactions:…”

Section: Introductionmentioning

confidence: 99%

Carbothermal reduction reaction as a strategy for boosting thermoelectric performance of binary metal oxides: a case study of ZnO ceramics

Farahi

Yousefizad

2023

Preprint

View full text Add to dashboard Cite

As a powerful concept, grain boundary (GB) engineering has been increasingly applied to enhance the energy conversion efficiency in thermoelectric materials through directly controlling the electrical and thermal transport characteristics. However, most efforts thus far have been focused solely on introducing extrinsic defects or impurity phases into the system without considering the role of intrinsic defects as critical factors. Thus, herein, we provide a holistic discussion on the correlation between the intrinsic defects and thermoelectric properties of materials using the carbothermal reduction (CTR) process. Taking ZnO as an example material, we experimentally show that vacancy-assisted migration of Zn interstitials lead to a decrease in the Schottky barrier height at grain boundaries. In addition, increasing the carrier concentration and band gap narrowing caused by the CTR reaction can lead to power factors up to 246 μW/mK2, which is comparable to the excellent values of transition metal-doped ZnO compounds. By minimizing the specific contact resistance of the interfaces down to 12.7 mΩ cm2 at a clamping pressure of 20 MPa, the output power of a single-leg module reaches an outstanding value of 292 μW at ΔT = 65 K, which is extremely higher than those of the state-of-the-art ZnO based materials, almost by a factor of three. We believe that the current study manifests a cost-effective avenue toward the development of efficient and practical thermoelectric devices.

show abstract

“…They determined the value of energy for the substrate transport process, the actual process and the diffusion process in the gas phase. In the study of the process of carbochemical dust reduction from the shaft furnace process, the authors of paper [ 34 ] carried out a theoretical analysis of the vacuum distillation process. The tests carried out in the temperature range of 800–900 °C enabled the reduction of zinc in the processed material by 99.6% by weight.…”

Section: Introductionmentioning

confidence: 99%

Zinc Evaporation from Brass Scraps in the Atmosphere of Inert Gas

et al. 2023

View full text Add to dashboard Cite

A description of the process of metal evaporation from liquid alloys at an atmospheric pressure has a practical value for both the smelting and remelting of their scraps. The quantities of volatile components that are eliminated in these processes depend on many factors of which the type of melting device, the method and conditions of the process performance, the alloy composition and the kind of applied atmosphere are of the greatest importance. In this paper, the results of the research on zinc evaporation from brass scraps containing 10.53 wt% Zn are presented. The experiments were conducted using the thermogravimetric method at 1080 ÷ 1240 °C in a helium atmosphere. In the research, the levels of zinc removal from copper ranged between 82% and 99%. The values of the overall mass transfer coefficient for zinc kZn, determined based on the experimental data, ranged from 4.74 to 8.46 × 10−5 ms−1. The kinetic analysis showed that the rate of the analysed process was determined by mass transfer in the gas phase.

show abstract

Separation and recovery of metallic zinc and iron concentrate from blast furnace dust by vacuum carbothermal reduction

Cited by 23 publications

References 29 publications

The Effects of Different Zn Forms on Sintering Basic Characteristics of Iron Ore

The Effects of Different Zn Forms on Sintering Basic Characteristics of Iron Ore

Carbothermal reduction reaction as a strategy for boosting thermoelectric performance of binary metal oxides: a case study of ZnO ceramics

Zinc Evaporation from Brass Scraps in the Atmosphere of Inert Gas

Contact Info

Product

Resources

About