Aluminum–iron separation in high‐acid leaching solution and high‐purity alumina preparation

2021 ◽  
Author(s):  
Hairong Shen ◽  
Likun Gao ◽  
Fangtong Ma ◽  
Bing Rao ◽  
Peng Jiang ◽  
...  
Keyword(s):  
High Purity ◽  
Acid Leaching ◽  
High Acid ◽  
Aluminum Iron ◽  
Leaching Solution

scholarly journals Correction to: Recovery of High-Purity MnO2 from the Acid Leaching Solution of Spent Li-Ion Batteries

JOM ◽  
2019 ◽  
Vol 72 (2) ◽  
pp. 978-978 ◽  
Author(s):  
Chao Peng ◽  
Cong Chang ◽  
Zulin Wang ◽  
Benjamin P. Wilson ◽  
Fupeng Liu ◽  
...  
Keyword(s):  
High Purity ◽  
Acid Leaching ◽  
Li Ion Batteries ◽  
Leaching Solution ◽  
Li Ion

scholarly journals Recovery of High-Purity MnO2 from the Acid Leaching Solution of Spent Li-Ion Batteries

JOM ◽  
2019 ◽  
Vol 72 (2) ◽  
pp. 790-799 ◽  
Author(s):  
Chao Peng ◽  
Cong Chang ◽  
Zulin Wang ◽  
Benjamin P. Wilson ◽  
Fupeng Liu ◽  
...  
Keyword(s):  
High Purity ◽  
Acid Leaching ◽  
Industrial Process ◽  
Li Ion Batteries ◽  
Step Process ◽  
Unit Process ◽  
Significant Research ◽  
Leaching Solution ◽  
Li Ion ◽  
Mn Recovery

Abstract Hydrometallurgical recycling processes for spent Li-ion batteries (LIBs) often produce pregnant leach solutions (PLS) that contain metals like Co, Ni, Mn, Li, Al, etc. Although significant research has focused on the recovery of the most valuable materials (e.g., Co, Ni, Li), the reclamation of Mn from PLS is often neglected. In this study, recovery of Mn via a multi-step process based on solvent extraction with di-2-ethylhexyl phosphoric acid, scrubbing, stripping and oxidative Mn precipitation has been undertaken. The results demonstrate that more than 99% of Mn can be successfully recovered as a high-purity MnO2 product (purity > 99.5%) with almost no loss of Co, Ni and Li. In addition, the behavior of other metal elements present in the PLS were also studied in detail. Overall, this study investigates the fundamentals of Mn recovery from the complicated PLS of LIBs waste and outlines industrial process feasibility based on known unit process steps.

Research on Purification Technology of Ultra-Large Flake Graphite Based on Alkali-Acid Method

2021 ◽  
Vol 1036 ◽  
pp. 104-113
Author(s):  
Hong Fei Guo ◽  
Bao Chao ◽  
Zeng Qi Zhao ◽  
Ding Nan
Keyword(s):  
Carbon Content ◽  
High Purity ◽  
Raw Materials ◽  
Acid Leaching ◽  
Flake Graphite ◽  
Fixed Carbon ◽  
Fusion Temperature ◽  
Acid Method ◽  
Fixed Carbon Content ◽  
Flake Structure

Graphite is a strategically scarce resource, and the preparation of high-purity graphite is the prerequisite and basis for the application of graphite. In order to determine the optimal purification technology parameters of an ultra-large flake graphite mine pneumatic separation ore with a fixed carbon content of 77.69%, a particle size of mainly 10 to 40 mesh, and main impurities of calcium carbonate, iron oxide and silica , two additional experiments of acid method and alkali method were added on the basis of alkali-acid method, to investigate the purification effect of different technological processes and acid leaching times on graphite raw materials, as well as to analyze the retention extent of different methods and alkali fusion temperature on graphite ultra-large flake structure. The results show that all three methods can increase the fixed carbon content of graphite to above 99%. However, compared with the acid method and the alkali method, the alkali-acid method can obtain high-purity graphite while also better protecting the graphite's ultra-large flake structure. The optimal fusion temperature is 400 °C, the optimal acid leaching time is 30% sulfuric acid thrice and 5% hydrofluoric acid once. After purification, the fixed carbon content of the product exceeds 99.97%.

Removal of Fe(III) from sulfuric acid leaching solution of phosphate ores with bisphosphonic acids

2021 ◽  
pp. 105799
Author(s):  
Chengjin Xu ◽  
Ling Li ◽  
Miaomiao Zhang ◽  
Xiao Meng ◽  
Xiujing Peng ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Sulfuric Acid Leaching ◽  
Leaching Solution ◽  
Bisphosphonic Acids ◽  
Phosphate Ores

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 %).

Recovery of Zinc and Manganese from Spent Zn-Mn Batteries Using Solvent Extraction

2018 ◽  
Vol 775 ◽  
pp. 427-433
Author(s):  
Wei Sheng Chen ◽  
Chin Ting Liao ◽  
Chen Hsi Chang
Keyword(s):  
Solvent Extraction ◽  
Magnetic Separation ◽  
High Purity ◽  
Ph Value ◽  
Acid Leaching ◽  
Extractant Concentration ◽  
Environmental Technology ◽  
Electronic Products ◽  
Waste Plastic ◽  
Purity Level

For several decades, zinc-manganese batteries have been created to serve many forms of electronic products. However, every creative act has its destructive consequence. Plenty of waste element inside has caused the irreversible contamination to our environment.This study will focus on dealing with zinc-manganese batteries using environmental technology and hydrometallurgy methods, such as physical pretreatment, acid leaching and solvent extraction. The goal of this research will concentrate on the recovery of zinc and manganese from zinc-manganese batteries. The pretreatment processes include crushing, sieving and magnetic separation to separate the waste plastic, scraps of paper and impurity from waste zinc-manganese batteries. Before the process of the solvent extraction zinc-manganese batteries will be leached by specific acid first. In next step, the solvent extraction will be carried out and investigated. The parameters such as extractant concentration, extraction time, equilibrium pH value and organic-aqueous ratio (O/A) are analyzed in detail. Finally, the products of Zn and Mn are obtained in high-purity level and the recovery rates are about 92% for Zn and 95% for Mn.

Effect of Trivalent Metal Cations on the Properties of LDHs Supercapacitors Prepared from Electroplating Sludge

2021 ◽  
Vol 1035 ◽  
pp. 1089-1095
Author(s):  
Jin Yun Zhu ◽  
Tao Jun Li ◽  
Li Chen ◽  
Tian Bao Liu ◽  
Xiu Ling Yan
Keyword(s):  
Acid Leaching ◽  
Metal Cations ◽  
Raw Material ◽  
Trivalent Metal ◽  
Specific Mass ◽  
Inhibition Effect ◽  
Electroplating Sludge ◽  
Leaching Solution ◽  
Supercapacitor Performance ◽  
Double Hydroxides

Trivalent metal cations are the basic composition of Layered Double Hydroxides (LDHs), however, the effect of metal cations on the supercapacitor performance of LDHs prepared from electroplating sludge has not been reported. In the present study the acid leaching solution of electroplating sludge was used as raw material, and Cr, Fe, Al and other common metal cations were added into the precursors to investigate the effect of trivalent metal cations on the supercapacitor performance of LDHs prepared from electroplating sludge. The experimental results show that the three kinds of metal cations can inhibit the specific mass capacitance of LDHs, and the sequence of inhibition effect is Fe < Al < Cr. This experiment is expected to provide some references for the resource utilization of electroplating sludge.

scholarly journals Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 359
Author(s):  
Nallely G. Picazo-Rodríguez ◽  
Ma. de Jesus Soria-Aguilar ◽  
Antonia Martínez-Luévanos ◽  
Isaias Almaguer-Guzmán ◽  
Josue Chaidez-Félix ◽  
...  
Keyword(s):  
Acid Leaching ◽  
Dissolution Kinetics ◽  
Pilot Scale ◽  
Influential Factors ◽  
Acid Media ◽  
Rate Limiting Step ◽  
Leaching Solution ◽  
Direct Leaching ◽  
Media Lab ◽  
Rate Limiting

The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors, respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using different reagents like Fe3+, O2, O3, and Fe2+ (which is continuously oxidized in the leaching solution by H2O2 and O2). The highest percentage of zinc extraction (96%) was obtained in pilot-scale experiments using H2SO4, Fe2+, and O2. Experimental results were compared with those of other researchers to provide a better understanding of the factors influencing the dissolution of zinc. In the first instance, it was determined from analysis of variance that leaching time and the use of an oxidant agent (O2 or O3) were the most influential factors during the direct leaching of zinc from the sphalerite concentrate. Kinetic models were also evaluated to determine the rate-limiting step of the sphalerite leaching; it was concluded that the type of the sulfur layer formed in the residue (porous or non-porous) depends on the type of the oxidant used in the leaching media, which determines the dissolution kinetics of zinc.

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