Role of sodium citrate in leaching of low-grade and multiphase zinc oxide ore in ammonia–ammonium sulfate solution

2017 ◽  
Vol 169 ◽  
pp. 534-541 ◽  
Author(s):  
Kun Yang ◽  
Libo Zhang ◽  
Chao Lv ◽  
Jinhui Peng ◽  
Shiwei Li ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Ammonium Sulfate ◽  
Sodium Citrate ◽  
Sulfate Solution ◽  
Low Grade ◽  
Ammonium Sulfate Solution

A Study on Leaching of Zinc Oxide Ore in Ammonium Sulfate Solution

2014 ◽  
Vol 522-524 ◽  
pp. 1463-1466
Author(s):  
Dan Dan Wu ◽  
Shu Ming Wen ◽  
Jing Yang ◽  
Yi Jie Wang ◽  
Chao Lv
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Ammonium Sulfate ◽  
Average Particle Size ◽  
Sulfate Solution ◽  
Solution Temperature ◽  
Average Particle ◽  
Leaching Rate ◽  
Ammonium Sulfate Solution ◽  
Effects Of Temperature

In this paper, the leaching effect of zinc oxide ore was investigated using ammonium sulfate solution as leaching agent. The effects of temperature, concentration of ammonium sulfate, average particle size and stirring speed on the leaching of zinc oxide ore were studied. The leaching rate increased with increasing solution temperature, concentration, and stirring speed as well as with decreasing average particle size. Ammonium sulfate solution can therefore be used as an effective leaching agent for zinc extraction from zinc oxide ore.

Effects of Sodium Citrate on the Ammonium Sulfate Recycled Leaching of Low-Grade Zinc Oxide Ores

2016 ◽  
Vol 35 (3) ◽  
pp. 275-281 ◽  
Author(s):  
Kun Yang ◽  
Shi-wei Li ◽  
Li-bo Zhang ◽  
Jin-hui Peng ◽  
Ai-yuan Ma ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Ammonium Sulfate ◽  
Sodium Citrate ◽  
Energy Dispersive Spectrum ◽  
Molar Ratio ◽  
Phase Method ◽  
Composition Analysis ◽  
Low Grade ◽  
Leaching Rate ◽  
Two Stages

AbstractThe effects of sodium citrate on ammonium sulfate recycled leaching of low-grade zinc oxide ores were studied. By applying various kinds of detection and analysis techniques such as chemical composition analysis, chemical phase method, scanning electron microscopy and energy dispersive spectrum (SEM/EDS), X-ray diffraction (XRD) and Fourier-transforming infrared spectrum (FT-IR), zinc raw ore, its leaching slag and the functional mechanism of sodium citrate were investigated. Based on a comprehensive analysis, it can be concluded that in contrast to hemimorphite (Zn4Si2O7(OH)2 · H2O), amorphous smithsonite (ZnCO3) and zinc silicate (Zn2SiO4) prove to be refractory phases under ammonium sulfate leaching, while sodium citrate has a better chelating action with the refractory phases, resulting in a higher zinc leaching rate. Under conditions of [NH3]/[NH3]T molar ratio being 0.5, [NH3]T being 7.5 mol/L, [Na3C6H5O7] being 0.2 mol/L, S/L ratio being 1:5, temperature being 303 K, holding time being 1 h in each of the two stages, and stirring rate being 300 rpm, the leaching rate of zinc reached 93.4%. In this article, sulfate ammonium recycled technology also reveals its unique advantage in processing low-grade zinc oxide ores accompanied by high silicon and high alkaline gangue.

Research on Raman Spectral Characteristics and Mechanism of Ammonium Sulfate Solution

2014 ◽  
Vol 34 (3) ◽  
pp. 0330004
Author(s):  
孙松 Sun Song ◽  
蔡廷栋 Cai Tingdong ◽  
刘莹 Liu Ying ◽  
王静静 Wang Jingjing ◽  
叶勇 Ye Yong ◽  
...  
Keyword(s):  
Ammonium Sulfate ◽  
Spectral Characteristics ◽  
Sulfate Solution ◽  
Ammonium Sulfate Solution ◽  
Raman Spectral

Amniotic fluid phosphatidylglycerol and phosphatidylinositol separated by stepwise-development thin-layer chromatography.

1980 ◽  
Vol 26 (2) ◽  
pp. 277-281
Author(s):  
M Mitnick ◽  
B DeMarco ◽  
J M Gibbons
Keyword(s):  
Thin Layer ◽  
Amniotic Fluid ◽  
Thin Layer Chromatography ◽  
Ammonium Sulfate ◽  
Sulfate Solution ◽  
Chromatographic Technique ◽  
Ammonium Sulfate Solution ◽  
Stepwise Development ◽  
Layer Chromatography ◽  
Phosphorus Determination

Abstract We describe a stepwise-development thin-layer-chromatographic technique for separating phosphatidylglycerol and phosphatidylinositol in samples of amniotic fluid. Plates are prepared from silica gel G slurried in a 50 g/L ammonium sulfate solution. Phospholipid phosphorus determination is not needed. Phospholipid phosphorus determination is not needed. Phosphatidylglycerol and phosphatidylinositol, measured densitometrically, are expressed as ratios to the sphingomyelin present. These ratios are correlated with the lecithin/sphingomyelin ratio and age of gestation in normal and abnormal pregnancies.

scholarly journals The Novel Strategy for Increasing the Efficiency and Yield of the Bipolar Membrane Electrodialysis by the Double Conjugate Salts Stress

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 343 ◽  
Author(s):  
Dong Wang ◽  
Wenqiao Meng ◽  
Yunna Lei ◽  
Chunxu Li ◽  
Jiaji Cheng ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Cation Exchange ◽  
Ammonium Sulfate ◽  
Sodium Sulfate ◽  
Sulfate Solution ◽  
Anion Exchange Membrane ◽  
Ammonium Sulfate Solution ◽  
Bipolar Membrane ◽  
Bipolar Membrane Electrodialysis ◽  
Exchange Membrane

To improve sulfuric acid recovery from sodium sulfate wastewater, a lab-scale bipolar membrane electrodialysis (BMED) process was used for the treatment of simulated sodium sulfate wastewater. In order to increase the concentration of sulfuric acid (H2SO4) generated during the process, a certain concentration of ammonium sulfate solution was added into the feed compartment. To study the influencing factors of sulfuric acid yield, we prepared different concentrations of ammonium sulfate solution, different feed solution volumes, and different membrane configurations in this experiment. As it can be seen from the results, when adding 8% (NH4)2SO4 into 15% Na2SO4 under the experimental conditions where the current density was 50 mA/cm2, the concentration of H2SO4 increased from 0.89 to 1.215 mol/L, and the current efficiency and energy consumption could be up to 60.12% and 2.59 kWh/kg, respectively. Furthermore, with the increase of the volume of the feed compartment, the concentration of H2SO4 also increased. At the same time, the configuration also affects the final concentration of the sulfuric acid; in the BP-A-C-BP (“BP” means bipolar membrane, “A” means anion exchange membrane, and “C” means cation exchange membrane; “BP-A-C-BP” means that two bipolar membranes, an anion exchange membrane, and a cation exchange membrane are alternately arranged to form a repeating unit of the membrane stack) configuration, a higher H2SO4 concentration was generated and less energy was consumed. The results show that the addition of the double conjugate salt is an effective method to increase the concentration of acid produced in the BMED process.

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