JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Qiren Wang,Xin Ma,Shuai Wang,Zhanfang Cao,Zongwei Hua,Hong Zhong
Sintering dust from the steelmaking industry is a hazardous waste that is rich in valuable metals. The purpose with the present study has been to design an efficient process for the preparation of K 2 SO 4 and NH 4 Cl fertilizers by using sintering dust as raw material. The K, S, and Cl in the sintering dust were selectively and efficiently leached using water. The leaching of Ca impurities was then greatly reduced and the appearance of Zn and Mg was avoided. The Cl − ions in the leachate were, thereafter, adsorbed by a 201 × 7 resin to form a K 2 SO 4 solution. Finally, the loaded Cl − on the resin was desorbed to form a NH 4 Cl solution, and the resin was regenerated and recycled. The purified solutions were crystallized to prepare K 2 SO 4 (s) and NH 4 Cl(s) products, which met the national standard of China for superior potassium sulfate and ammonium chloride , to be used for agricultural use. The recoveries of K, Cl, and S from the sintering dust were 80.78%, 92.63%, and 93.92%, respectively. Notably, the Mn content in the leaching residue increased from 9.08% to 14.19%. This could be used for the conversion of Mn impurities into recyclable manganese-rich raw materials. This green process enables an effective extraction of important impurities in hazardous sintering dust, thereby providing a new potassium source for potash fertilizer manufacturing with notable economic and environmental benefits.
研究领域:
环境科学
·
化学工程
·
材料科学
·
农业
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Physics
·
2024
·
IF 10
Yuping Duan,Meiqi Li,Yuan Guo,Ning Zhu,Huifang Pang,Chenxu Dou
High-entropy alloys, as a novel type of absorber, exhibit exceptional electromagnetic modulation capabilities and significant potential for electromagnetic wave absorption. In this work, the FeCoNiCrMn high-entropy alloy absorbent prepared through a mechanical alloying process demonstrates a dual-phase solid solution structure comprising face-centered cubic (FCC) and body-centered cubic (BCC) phases. By varying the manganese (Mn) content in the system, it is possible to enhance the degree of crystallinity, maintain the integrity of the crystal structure, and effectively control the relative proportion of the BCC phase within the overall phase composition. This adjustment improves the brittleness of the sheet-like particles, reduces particle size, and significantly lowers the permittivity. When the molar ratio of Mn is 0.6, the sample exhibits improved impedance matching due to the optimal permittivity and permeability. Notably, the impedance matching and attenuation constant can also be balanced. At 6.42 GHz, the FeCoNiCr 0.4 Mn 0.6 alloy powder achieves the maximum reflection loss of −48.49 dB at a matching layer thickness of 3 mm. When the matching thickness is reduced to 2 mm, it can effectively cover a frequency range of 8.7–14.1 GHz (effective absorption bandwidth of 5.4 GHz), along with a wide absorption bandwidth and high absorption efficiency.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2025
·Vol. 114
·期 4
·1-7
·
IF 2.2
Yuan Yuan,Cai Weiping,Huang Yingnan,Shi Shuaishuai,Wang Yujun,Dang Fei
Growing evidence has indicated that mercury sulfide nanoparticles (HgS NPs) are the potential precursors for neurotoxic methylmercury. But how and which soil components affect HgS NP retention remains unclear. Here, we examined the retention of uncoated and humic acid coated HgS NPs in 18 natural soils with varied properties. Our results suggested that the K r values (retention coefficients) for uncoated and humic acid HgS NPs were 2.46 × 10 3 to 8.32 × 10 5 L kg − 1 and 3.00 × 10 3 to 2.73 × 10 5 L kg − 1 , respectively. Soil properties (i.e., electrical conductivity, organic matter (OM), oxalate-extractable Fe and Mn) significantly affected the uncoated HgS NP retention, accounting for 69% of the variability in the K r values. Meanwhile, OM exhibited a tendency to reduce coated HgS NP retention. Importantly, HgS NPs exhibited significant dissolution in representative soil porewaters. These findings highlight the soil property-dependent retention of HgS NPs in realistic environment.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Wenzhuo Deng,Ying Li
The measurement of manganese concentration in liquid iron without sampling is a challenge for better production control and improving the efficiency of the steelmaking process. An electrochemical sensor was developed to address this issue. As a crucial component of the sensor, the MnO, which functions as the auxiliary electrode material , was mixed with PVA water solution and deposited on the raw magnesia-doped zirconia tube, and thereafter annealed under an argon atmosphere at 1600 °C. The X-ray diffraction indicates the MnO coating remains intact after sintering, and scanning electron microscopy shows the MnO layer tightly adheres to the solid electrolyte. The performance of the galvanic cell is appreciably affected by the particle size of the MnO powder, in the case of fine powder, steady cell potentials can be obtained quickly after immersion into the molten iron. The electromotive force of the cell is inversely proportional to the Mn content, and a linear equation between the two was derived. Furthermore, the relationship between the calculated Mn activities and the Mn concentrations determined by chemical analysis implies a positive deviation from Henry's law , which may chiefly arise from the fact that the MnO activity is less than unity. Additionally, the ionic conductivity of 8mol%Mg-PSZ and the activation energy were also investigated.
研究领域:
冶金学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）