scholarly journals Improvement of selective copper extraction from a heat-treated chalcopyrite concentrate with atmospheric sulphuric-acid leaching

2016 ◽  
Vol 50 (3) ◽  
pp. 395-401
Author(s):  
Elif Uzun ◽  
Zengin Mustafa ◽  
Ismail Atilgan
Keyword(s):  
Sulphuric Acid ◽  
Acid Leaching ◽  
Copper Extraction ◽  
Heat Treated ◽  
Chalcopyrite Concentrate

scholarly journals Effect of iron powder on copper extraction by acid leaching of chalcopyrite concentrate.

1996 ◽  
Vol 29 (4) ◽  
pp. 720-722 ◽  
Author(s):  
Ezequiel Cruz Sanchez ◽  
Yoshiaki Umetsu ◽  
Fumio Saito
Keyword(s):  
Iron Powder ◽  
Acid Leaching ◽  
Copper Extraction ◽  
Chalcopyrite Concentrate

Investigating and Optimization of Copper Extraction from Chalcopyrite Concentrate with Hydrogen Peroxide in Presence of Acetic Acid

2017 ◽  
Vol 7 (4) ◽  
Author(s):  
Mehmat Deniz Turan ◽  
Musa Sarikaya ◽  
Z. Abidin Sari ◽  
Ahmet Haxhiaj ◽  
Tolga Depci ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Copper Extraction ◽  
Chalcopyrite Concentrate

scholarly journals PURIFICATION OF INDONESIAN NATURAL GRAPHITE AS CANDIDATE FOR NUCLEAR FUEL MATRIX BY ACID LEACHING METHOD: CHEMICAL CHARACTERIZATION

2020 ◽  
Vol 26 (3) ◽  
Author(s):  
Deni Mustika ◽  
Torowati Torowati ◽  
Arbi Dimyati ◽  
Sudirman Sudirman ◽  
Adel Fisli ◽  
...  
Keyword(s):  
Sulphuric Acid ◽  
Nuclear Fuel ◽  
Hydrofluoric Acid ◽  
Acid Leaching ◽  
Chemical Characterization ◽  
Ash Content ◽  
Natural Graphite ◽  
Nuclear Graphite ◽  
Purity Level ◽  
Graphite Matrix

PURIFICATION OF INDONESIAN NATURAL GRAPHITE AS CANDIDATE FOR NUCLEAR FUEL MATRIX BY ACID LEACHING METHOD: CHEMICAL CHARACTERIZATION. Graphite matrix in Pebble Bed Reactor (PBR) – High Temperature Gas Cooled Reactor (HTGR) has an important role as heat transfer medium, neutron moderator and structural material to protect fuel. Thus, graphite matrix must fulfill chemical and physical characteristics for PBR-HTGR fuel. Indonesia has graphite sources in several regions that can potentially be purified. This research aimed to purify Indonesian natural graphite by several variation of acids and to perform chemical characterizations. Natural graphite from flotation process was purified by several variations of acid, i. e., hydrofluoric acid (HF), sulphuric acid + nitric acid (H2SO4 + HNO3) and hydrofluoric acid + hydrochloric acid + sulphuric acid (HF + HCl + H2SO4) and subsequently followed by chemical characterizations such as purity level, ash content, and boron quivalent. The highest purity was obtained in the purification process by HF with carbon content up to 99.52%; this purity level fulfills the specification of nuclear graphite (>99%). Ash content analysis shows a value in compliance with the specification requirement, i.e., < 100 ppm, and boron equivalent value also fulfills the specification value of < 1 ppm. It can be concluded from this study that the graphite purified by acid leaching with HF can be used as fuel matrix candidate but is qualified as low quality. Futher research is required to produce high quality nuclear graphite, particularly research in the minimization of the impurity by evaporation at temperatures over 950 oC to by far lower the ash content.Keywords:  Indonesian natural graphite, purification, nuclear fuel matrix, acid leaching, chemical characterization.

scholarly journals Characterization of dross and its recovery by sulphuric acid leaching

2018 ◽  
Vol 985 ◽  
pp. 012033 ◽  
Author(s):  
S A Rahmani ◽  
A Meidianto ◽  
M I Amal ◽  
A S Wismogroho ◽  
W B Widayatno
Keyword(s):  
Sulphuric Acid ◽  
Acid Leaching

Phosphorus recovery from the sludge generated from a continuous bipolar mode electrocoagulation (CBME) system

2019 ◽  
Vol 79 (7) ◽  
pp. 1348-1356 ◽  
Author(s):  
M. Damaraju ◽  
H. Yoshihara ◽  
D. Bhattacharyya ◽  
T. K. Panda ◽  
K. K. Kurilla
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Acid Leaching ◽  
Renewable Resource ◽  
Phosphorus Recovery ◽  
Raw Material ◽  
Time Intervals ◽  
Operational Conditions ◽  
Bipolar Mode ◽  
Palm Oil Mill

Abstract Phosphorus is known to be a limited non-renewable resource. Phosphorus is obtained from phosphate rock, which is likely to be depleted in the next few decades. Therefore, it is very important to find alternate sources of phosphorus from which phosphorus can be recycled and recovered. This study focuses on the recovery of phosphorus from the sludge generated from a continuous bipolar mode electrocoagulation (CBME) system, used for treating a palm oil mill effluent (POME). The sludge generated from the CBME system is leached with oxalic acid and sulphuric acid for phosphorus recovery with and without thermal treatment. Acid leaching was carried out at various time intervals using various liquid/solid (L/S) ratios of acids and sludge. The CBME system caused a 73% removal of phosphorus from POME, where phosphorus is precipitated in sludge as iron phosphates or adsorbed as phosphates depending on the pH in the system. Acid leaching resulted in nearly 85% recovery of phosphorus with both sulphuric acid and oxalic acid for sludge combusted at 900 °C. Statistical analysis was carried out to find the significance of the operational conditions on the phosphorus yield. Acid leaching results in the formation of orthophosphates, which can be used as a raw material for synthesis of chemical fertilizers.

scholarly journals Study on Enhancing Zinc Dusts with Direct Sulphuric Acid Leaching

2015 ◽  
Vol 27 (8) ◽  
pp. 2801-2805
Author(s):  
H.Y. Sun ◽  
X. Kong ◽  
W. Sen ◽  
G.Y. Liu
Keyword(s):  
Sulphuric Acid ◽  
Acid Leaching

Recovery of Lanthanides in the Sulphuric Acid Leaching Process of Kola Apatites

1995 ◽  
Vol 15 (1-4) ◽  
pp. 142-142 ◽  
Author(s):  
IGOR A. DIBROV ◽  
DIMITRI E. CHIRKST ◽  
K. N. CHALIYAN
Keyword(s):  
Sulphuric Acid ◽  
Acid Leaching ◽  
Leaching Process
Sign in / Sign up

Export Citation Format

Share Document