scholarly journals Preparation of Zinc Oxide and Zinc Ferrite from Zinc Hypoxide by Wet Process and Electrochemistry

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1133
Author(s):  
Hui Li ◽  
Yutian Fu ◽  
Jinglong Liang ◽  
Le Wang ◽  
Hongyan Yan ◽  
...  
Keyword(s):  
Zinc Ferrite ◽  
Removal Rate ◽  
Wet Process ◽  
Reduction Potentials ◽  
Electrochemical Testing ◽  
Zinc Carbonate ◽  
Leaching Solution ◽  
Leaching Residue ◽  
Ammonia Leaching ◽  
Copper Lead

With the increase of zinc resource consumption, the recovery and utilization of zinc resources in zinc suboxide has become one of the current research hotspots. In this study, the electrochemical method was used to remove the impurities in the zinc leaching night and enrich the zinc ferrite in the ammonia leaching residue for the solution and ammonia leaching slag after the ammonia leaching of zinc hypoxide, in order to realize the comprehensive utilization of the essence of zinc immersion night and new resources. The results showed that the reduction potentials of copper, lead, cadmium, and zinc in the ammonia leaching solution were analyzed by electrochemical testing methods to be −0.76 V, −0.82 V, −0.94 V, and −1.3 V, respectively. Through constant potential electrodeposition, the removal rate of copper, lead, cadmium. The removal rate of cadmium is 98.73%, and the removal rate of lead and copper is more than 99%. The purified ammonia leaching solution is evaporated at 90 °C for 25 min to obtain basic zinc carbonate. The purity of ZnO obtained after calcination at 500 °C for 120 min is 96.31%. The ammonia leaching residue was pickled with 3 mol·L−1 acetic acid for 30 min to effectively remove PbCO3, and then magnetic separation was carried out with a current intensity of 1.4 A. The final zinc ferrite content was 83.83%.

scholarly journals Microbial Removal of Pb(II) Using an Upflow Anaerobic Sludge Blanket (UASB) Reactor

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 512
Author(s):  
Jeremiah Chimhundi ◽  
Carla Hörstmann ◽  
Evans M. N. Chirwa ◽  
Hendrik G. Brink
Keyword(s):  
Treatment Process ◽  
Removal Rate ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Reduction Potentials ◽  
Oxidation Reduction ◽  
Anaerobic Sludge Blanket ◽  
Microbial Removal ◽  
Maximum Removal

The main objective of this study was to achieve the continuous biorecovery and bioreduction of Pb(II) using an industrially obtained consortia as a biocatalyst. An upflow anaerobic sludge blanket reactor was used in the treatment process. The bioremediation technique that was applied made use of a yeast extract as the microbial substrate and Pb(NO3)2 as the source of Pb(II). The UASB reactor exhibited removal efficiencies of between 90 and 100% for the inlet Pb concentrations from 80 to 2000 ppm and a maximum removal rate of 1948.4 mg/(L·d) was measured. XRD and XPS analyses of the precipitate revealed the presence of Pb0, PbO, PbS and PbSO4. Supporting experimental work carried out included growth measurements, pH, oxidation–reduction potentials and nitrate levels.

Zinc carbonate recovery from brass melting slag

2021 ◽  
Vol 98 ◽  
pp. 14-18
Author(s):  
Thao Nguyen Thi ◽  
◽  
Nam Pham Ky ◽  
Ngoc Tran Vu Diem
Keyword(s):  
Sulfuric Acid ◽  
High Purity ◽  
Room Temperature ◽  
Ph Value ◽  
Zinc Carbonate ◽  
Leaching Solution ◽  
Optimized Conditions ◽  
Melting Slag

Brass melting slag (20.38 wt.% Zn) was leached in sulfuric acid with concentration of (50 + 80) g/l H2SO4, leaching temperature of (30 + 60) °C for (30 + 120) min. The optimized conditions for 94.16% Zn extraction from brass melting slag were found as 70 g/l H2SO4, room temperature and 90 min. The leaching solution was purified by removal of Fe through Fe(OH)3 precipitation when adding ZnO to adjust pH value of 5. The solution was continuously cemented by Zn metal at 60 °C for 60 min to obtain Cu metal with high purity of 99 wt.% Cu. The purified solution with 37.64 g/l Zn was modified by Na2C03 to have pH value of about 6 and precipitation of ZnC03 (94.14 %).

Experimental Study on Sulfuric Acid Leaching Behavior of Chromite with Different Temperature

2011 ◽  
Vol 361-363 ◽  
pp. 628-631 ◽  
Author(s):  
Cheng Jun Liu ◽  
Jie Qi ◽  
Mao Fa Jiang
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Raw Material ◽  
Leaching Rate ◽  
Sulfuric Acid Leaching ◽  
Leaching Process ◽  
Pollution Problem ◽  
Environmental Pollution Problem ◽  
Leaching Solution ◽  
Leaching Residue

Utilizing Pakistan chromite as raw material, the rapid leaching of chromium and iron could be realized by the sulfuric acid leaching process on the condition of atmospheric pressure and the addition of oxidant A. And the leaching rate of chromium and iron would be 98.5% and 71.9%, respectively. The sulfuric acid leaching processes with different temperature were systematically studied by chemical analysis and phase analysis. The results showed that, with the increase of reaction temperature, the leaching rate of chromium would increase gradually, but the leaching rate of iron increased at first and then decreases and reached its maximum at 140°C. When the temperature > 160°C, the phases of the leaching residue were magnesium iron silicate and a few of silica, no chromohercynite, chrompicotite and magnesioferrite existed in the chromite. The leaching solution of sulfuric acid leaching process could be used for preparing the basic chrome sulfate, and there is no Cr6+ in the leaching residue and solution. The results would provide theoretical guidance for solving environmental pollution problem of Cr6+ in traditional chromate production process.

Characteristics of the reduction behavior of zinc ferrite and ammonia leaching after roasting

2020 ◽  
Vol 27 (1) ◽  
pp. 26-36 ◽  
Author(s):  
Chao Wang ◽  
Yu-feng Guo ◽  
Shuai Wang ◽  
Feng Chen ◽  
Yu-jia Tan ◽  
...  
Keyword(s):  
Zinc Ferrite ◽  
Reduction Behavior ◽  
Ammonia Leaching

scholarly journals Decomposition of Zinc Ferrite in Zinc Leaching Residue by Reduction Roasting

2012 ◽  
Vol 16 ◽  
pp. 705-714 ◽  
Author(s):  
Ning Peng ◽  
Bing Peng ◽  
LiYuan Chai ◽  
Wei Liu ◽  
Mi Li ◽  
...  
Keyword(s):  
Zinc Ferrite ◽  
Reduction Roasting ◽  
Leaching Residue

Experimental Study on Zinc Leaching of Blast Furnace Gas Ash by Ammonia Leaching

2014 ◽  
Vol 962-965 ◽  
pp. 780-783
Author(s):  
Jie Wang ◽  
Wei Xiong ◽  
Bao Ping Zhang
Keyword(s):  
Blast Furnace ◽  
Removal Rate ◽  
Influence Factors ◽  
Environmental Benefits ◽  
Main Task ◽  
Leaching Rate ◽  
Iron And Steel ◽  
Leaching Process ◽  
Blast Furnace Gas ◽  
Ammonia Leaching

Blast furnace gas ash is one of the main solid wastes in iron and steel enterprise. The recovery of zinc from gas ash can result in considerable economic and environmental benefits. The effect of NH3/NH4+, L/S, [NH3]T and leaching time on the zinc leaching rate of blast furnace gas ash by using ammonia leaching process had been investigated in this paper. The results show that L/S and NH3/NH4+ are the main influence factors under the experimental condition. The optimal conditions for leaching process are: NH3/NH4+=2:1, L/S=4:1, [NH3]T =5mol/L, and the leaching time is 3 hours. The zinc leaching rate is 82.84% under the optimized conditions. The lead content in leaching solution is high, so the main task is to improve the removal rate of lead in the purification process.

Adaptive process for improving leaching efficiency of germanium from secondary zinc oxide

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yingxu Zhu ◽  
Zhigan Deng ◽  
Chang Wei ◽  
Yuan Yang ◽  
Pu Sun ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Lead Sulfate ◽  
Batch Experiments ◽  
Adaptive Process ◽  
Leaching Solution ◽  
Neutralization Process ◽  
Leaching Residue ◽  
The Stability ◽  
Leaching Parameters ◽  
Leaching Efficiency

Abstract Adaptive process was used to treat germanium-containing secondary zinc oxide. The leaching parameters were determined by batch experiment, and continuous experiment was conducted and the stability of the process was verified. The leaching efficiency of Zn and Ge in the batch experiments were 92.51 and 90.67%, respectively, while the leaching efficiencies of Zn and Ge in the continuous experiment were 93.53 and 88.47%, respectively. In the neutralization process, the Fe3+ concentration in the neutralized solution is within 0.025 g/L. The Fe2+in the leaching solution increased gradually, as the neutralized residue was returned to the leaching process, the Zn in leaching residue reduce and the leaching efficiency of Zn increased. The residue mainly contained zinc sulfide and lead sulfate, with some fluffy structures on the surface. The process is promising for industrial application from indicators, economy, and applicability.

Study on Flotation of Leaching Residue from Zinc Oxide Ore

2013 ◽  
Vol 807-809 ◽  
pp. 2361-2365
Author(s):  
Shan Wang ◽  
Zhi Cong Wei ◽  
Jian Jun Fang ◽  
Xiao Lin Zhang ◽  
Tie Min Zhang
Keyword(s):  
Zinc Oxide ◽  
Zinc Sulfide ◽  
Phase Recovery ◽  
Lead And Zinc ◽  
Verification Test ◽  
Leaching Residue ◽  
Ammonia Leaching ◽  
Flotation Behavior

Flotation behavior on ammonia leaching residue of alkaline zinc oxide ore from Lanping has been studied in traditional flotation, and the performance of bulk flotation showed that residue has a better floatability than raw ore when they are in the same process and same conditions, an operation recovery of lead and zinc can reach to 49.34% and 57.03% respectively in 3minutes. The followed verification test showed that phase recovery of zinc sulfide reach up to 76.5 in rough concentrates that from bulk flotation, the dissolution and activation affect of ammonia leaching residue is evidently.

The Uptake of Gold(I) from Ammonia Leaching Solution by Imidazole Containing Polymeric Resins

2009 ◽  
Vol 44 (5) ◽  
pp. 1099-1119 ◽  
Author(s):  
Magdalena Pilśniak ◽  
Andrzej W. Trochimczuk ◽  
Wiesław Apostoluk
Keyword(s):  
Leaching Solution ◽  
Polymeric Resins ◽  
Ammonia Leaching
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