TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2023
·
IF 4.5
Kun WANG,Yan LIU,Jun HAO,Zhi-he DOU,Guo-zhi LV,Ting-an ZHANG
To recover copper from copper slag, a novel slag cleaning method was proposed. The thermodynamics and binary phase diagram of FeO–SiO 2 were calculated first. Then, the effects of experimental parameters on the reduction of Fe 3 O 4 , recovery of copper, and slag cleaning mechanism were investigated. The results showed that the addition of SiO 2 significantly reduced the initial reduction temperature of magnetite and pyrite. The contents of Fe 3 O 4 and copper decreased to 2.45 wt.% and 0.39 wt.%, respectively, with copper recovery of 92.52% under the optimum conditions. More than 94% silver and 99% gold subsided into the copper matte after slag cleaning. Approximately 72% of zinc and 75% of lead volatilized in the flue gas. The viscosity of the copper slag decreased from 0.68 to 0.12 Pa·s due to the reduction of magnetite. The sedimentation of copper matte droplets could be enhanced by mechanical stirring.
研究领域:
冶金工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Panpan Xu,Yupeng Wang,Wentao Hao,Li Sun,Ensi Cao,Yongjia Zhang
(In 0.5 Nb 0.5 ) x Ti 1-x O 12 (INTO) ceramics exhibit the unusual dielectric properties of giant dielectric constant and good stabilities, but their low-frequency dielectric loss is relatively large, and the sintering temperature is too high, which are very disadvantageous for practical applications. According to internal barrier layer capacitance effect, which seems to be the most plausible mechanism of the unusual dielectric properties , constructing insulating phase boundaries in INTO ceramics is an effective way to reduce their low-frequency dielectric loss. In this paper, SiO 2 was added to INTO ceramics, because, on the one hand, the insulating phase boundaries could be constructed by SiO 2 , on the other hand, SiO 2 could play the role of sintering agent to reduce the sintering temperature. Therefore, the SiO 2 /INTO ceramics were prepared by solid-state reaction, and their crystalline structures, microstructures, and electrical properties were analyzed. Compared to previous reports, the low-frequency dielectric loss of SiO 2 /INTO ceramics after annealing, which were sintered at a lower temperature of 1300 °C for a shorter time of 5 h, decreases substantially. The reason was discussed.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 8
·086319
·
IF 1.449
Gang Chen,Tao Fan,Shilong Zhang,Cong Xie,Chunlin Fu,Rongli Gao,Zhenhua Wang,Xiaolin Deng,Peigeng Fan,Wei Cai
(100–x) wt% (0.95BT–0.05BY)–x wt% (0.5MgO–0.5SiO2) (x = 0, 1, 2, 4, 8) ceramics were fabricated by using a solid-state synthesis method. The effects of the MgO–SiO2 doping on the microstructure, the ferroelectric, and the dielectric properties of BT–BY ceramics were investigated in detail. The results show that the relative permittivity initially decreases and then increases again upon the increase in the MgO–SiO2 content. The addition of the MgO–SiO2 glass oxide dopant enhances the frequency and the temperature stability of the relative permittivity of BT–BY ceramics. Moreover, the coercive field and the remnant polarization increase and then decrease with increasing MgO–SiO2 dopant content, while the slim P–E loops are observed when x ≥ 2. The largest values for the remanent polarization (1.2 μC cm−2) and the coercive field (9.18 kV cm−1) are obtained at x = 1. The addition of MgO–SiO2 can induce a small leakage current in the BT–BY ceramic when x ≥ 2. The breakdown strength increases with decreasing grain size when MgO–SiO2 is added moderately. Its value increases from 80 kV cm−1 up to 100 kV cm−1 when x changes from 0 to 8. The energy storage density and efficiency of the (100–x) wt% (0.95BT–0.05BY)–x wt% (0.5MgO–0.5SiO2) ceramics decrease and then increase with increasing x. The maximum values of the electrical energy storage density (0.24 J cm−3) and energy efficiency (85.77%) are obtained when x = 8.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Jiali You,Tao Yang,Dandan Feng,Zhihong Li
Corundum abrasives with plate-like grains were fabricated by a two-step sintering technique using the solution-based process with the addition of the ternary compound additive Na 3 AlF 6 -CaO-SiO 2 . The two-step sintering method showed obvious advantages over conventional sintering methods in promoting sample densification, suppressing grain growth, and homogenizing the microstructure of the corundum abrasives. The sample doped with 2.5 wt% Na 3 AlF 6 and 4 wt% CaO + SiO 2 in the molar ratio of 1:1 possessed a relative density of 99.3%, average grain size of 0.54 µm, and single-particle compressive strength of 49 N. The introduction of seeds reduced the temperature of θ- to α-Al 2 O 3 phase transformation. The relationship between the microstructure and the mechanical properties of the abrasives was also discussed.
研究领域:
材料科学
·
陶瓷工程
✓ 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）