Studying on Leaching Zinc Oxide Ore in the System of H2SO4

2013 ◽  
Vol 785-786 ◽  
pp. 1087-1090
Author(s):  
Ying Bo Mao ◽  
Zhi Cong Wei ◽  
Jian Jun Fang ◽  
Shan Wang ◽  
Tie Min Zhang
Keyword(s):  
Zinc Oxide ◽  
Sulfuric Acid ◽  
Yunnan Province ◽  
Leaching Test ◽  
Leaching Rate ◽  
Optimum Conditions ◽  
Liquid Ratio

Leaching test on the Oxidized Zinc Ore coming from Yunnan Province is studied in the H2SO4 system;Systematic studies are made to show the effects of various factors on the leaching rate of zinc. The optimum conditions for leaching is finally confirmed, namely the grinding size is 75% of-0.074mm, concentration of sulfuric acid 15%, temperature 60°C, solid to liquid ratio 3:1, and leaching time 2.5h. Ultimately, the leaching rate of Zn could reach more than 59%.

Influence of Important Factors on Ammonia Leaching of Alkaline Zinc Oxide Mineral

2013 ◽  
Vol 785-786 ◽  
pp. 1076-1080
Author(s):  
Xiao Dong Jia ◽  
Zhi Cong Wei ◽  
Dian Wen Liu ◽  
Jing Jie Yuan
Keyword(s):  
Zinc Oxide ◽  
Yunnan Province ◽  
Ammonia Concentration ◽  
Ammonium Bicarbonate ◽  
Leaching Rate ◽  
Optimum Conditions ◽  
Liquid Ratio ◽  
Oxide Mineral ◽  
Ammonia Leaching

The effects of refractory zinc oxide ore which came from Lanping of Yunnan Province were studied using agitation leach method in laboratory in order to find out the optimum leaching conditions. The optimum conditions obtained are as follows: ammonia concentration 3mol/L, ammonium bicarbonate 1.5mol/L, granularity (-0.074mm) about 85%, solid to liquid ratio 4:1, and leaching time 2h. On this condition, the test obtained the better index of the zinc leaching rate 74.4%.

Studying on Leaching Low Grade Copper Oxide Ore in the System of NH4CO3-H2O

2012 ◽  
Vol 581-582 ◽  
pp. 1083-1087
Author(s):  
Ying Bo Mao ◽  
Jian Jun Fang ◽  
Ya Wen ◽  
Shan Wang ◽  
Wen Juan Zhao ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Ammonium Carbonate ◽  
Low Grade ◽  
Leaching Test ◽  
Leaching Rate ◽  
Optimum Conditions ◽  
Liquid Ratio ◽  
Copper Ore ◽  
Stirring Intensity

Leaching test on the Oxidized Copper Ore coming from Dishui, XinJiang Province is studied in the NH4CO3-H2O system；Systematic studies are made to show the effects of various factors on the leaching rate of copper. The optimum conditions for leaching is finally confirmed, namely the grinding size is 85% of -0.074mm, concentration of Ammonium carbonate 2mol/L, temperature 45°C, solid to liquid ratio 3:1, stirring intensity 300r/min and leaching time 1.5h. Ultimately, the leaching rate of Cu could reach more than 87%.

Preparation of Alumina from Fly Ash by Sulfuric Acid

2013 ◽  
Vol 734-737 ◽  
pp. 1551-1554 ◽  
Author(s):  
Ying Lu Lv ◽  
Chao Yi Chen ◽  
Zhi Hui Mao
Keyword(s):  
High Pressure ◽  
Sulfuric Acid ◽  
Fly Ash ◽  
Iron Content ◽  
Pressure Leaching ◽  
Leaching Rate ◽  
Optimum Conditions ◽  
Extraction Metallurgy

Extraction metallurgy level alumina from fly ash through high-pressure leaching, removing iron, crystallizing and roasting processes were considered. The optimum conditions of high-pressure leaching, removing iron and roasting processes were obtained by experiments. The leaching rate of Al2O3can reach 93.1% and the purity of Al2O3product can reach above 98% under these conditions. The iron content in Al2(SO4)3solution can decrease from 1.21% to 0.10% when fly ash as alkaline agents.

scholarly journals Control of the Redox Potential by Microcontroller Technology: Researching the Leaching of Chalcopyrite

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 382
Author(s):  
Xin Sun ◽  
Wenbing Yuan ◽  
Kai Jin ◽  
Yansheng Zhang
Keyword(s):  
Sulfuric Acid ◽  
Redox Potential ◽  
The Other ◽  
Leaching Tests ◽  
Redox Potentials ◽  
Leaching Test ◽  
Leaching Rate ◽  
Iron Deficient ◽  
Initial Ph

The leaching of chalcopyrite under different redox potentials was studied with a redox potential controlling device based on microcontroller technology. The leaching test was carried out in a 500 mL flask with 4 g pure chalcopyrite and 200 mL sulfuric acid. The additional total Fe concentration was 0.1 mol/kg, and the initial pH was 0.7. Chalcopyrite leaching tests with initial redox potential of 400 mV and 600 mV (vs. Ag/AgCl, the same below) and controlled redox potential of 350 mV, 400 mV, 450 mV, 500 mV, and 600 mV were carried out at a temperature of 60 °C and a stirring speed of 300 rpm. The results showed that the dissolution of chalcopyrite could not be hindered until the granular intermediates (S0 and Sn2−) accumulated to a certain amount on the chalcopyrite surface. The main passivating species in chalcopyrite dissolution may be iron-deficient polysulfides. At 400 mV, the chalcopyrite passivation by polysulfides was overcome by the galvanic effect between pyrite and chalcopyrite, and the chalcopyrite was rapidly oxidized with Cu leaching rate reaching up to 32% in 7 h, while it was only 15% in the other experimental groups. However, at 450–500 mV, pyrite was oxidized and the galvanic effect between chalcopyrite and pyrite was destroyed, leading to a significant decrease in Cu leaching rate. When the redox potential was 600 mV, the dissolution of metal-deficient polysulfides was promoted; thus, the passivation was weakened.

Recovery of Copper from Flotation Tailings by Leaching

2013 ◽  
Vol 325-326 ◽  
pp. 128-132 ◽  
Author(s):  
Dan Liu ◽  
Shu Ming Wen ◽  
Yong Jun Xian ◽  
Hai Ying Shen ◽  
Jiu Shuai Deng ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Copper Oxide ◽  
Magnesium Oxide ◽  
Calcium Oxide ◽  
Acid Leaching ◽  
Reverse Flotation ◽  
Leaching Test ◽  
Leaching Rate ◽  
Copper Leaching ◽  
Leaching Solution

A technology route of Reverse flotation of acid-consuming gangue mineralsAcid leaching for copperExtractingElectrodepositing is proposed for recovery copper from a tailings with high content of calcium oxide and magnesium oxide and high content of combined copper oxide. The effect of H2SO4concentration, leaching time and stirring speed on copper leaching was investigated. The leaching solution obtained under the optimal copper leaching conditions, was used to be proceeded for extracting and electrodepositing test. The best leaching conditions are stirring speed of 30 m/min, H2SO4concentration of 150 Kg/t ore, leaching time of 30 minutes. Under the best conditions, the acid leaching test presented that the production of per ton copper consumes sulfuric acid of 17.31 t, and Cu leaching rate is 84.70%.

Effect of Ethanol Treatment on Lycopene Extraction yield

2018 ◽  
Author(s):  
Nam Kyong-il ◽  
KIM rak-chon ◽  
Kang chang-hyok ◽  
Lee song-nam ◽  
Ryom sok-hun
Keyword(s):  
Antioxidant Activity ◽  
Treatment Time ◽  
Extraction Yield ◽  
Extraction Rate ◽  
Test Results ◽  
Ethanol Treatment ◽  
Optimum Conditions ◽  
Liquid Ratio ◽  
Pretreatment Method ◽  
Ethanol Pretreatment

In order to extract lycopene more effectively, this experiment focused on the optimization of ethanol pretreatment method to study the effects of ethanol treatment on the extraction rate of lycopene and its antioxidant activity. The test results show that 2 times ethanol treatment is very effective for improving lycopene yield. The optimum conditions of ethanol treatment are temperature 50 ℃, treatment time 1 time 2h, 2 times 2h, solid to liquid ratio is 1:12. The lycopene yield can be reached 20mg / 100g above.

scholarly journals Chemical Removal of Cu and Zn from Swine Feces before Soil Application

Agriculture ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 377
Author(s):  
Moo-Joon Shim ◽  
Seung-Mok Lee
Keyword(s):  
Reaction Time ◽  
H2so4 Solution ◽  
Optimum Conditions ◽  
Liquid Ratio ◽  
Optimal Method ◽  
Zn Concentration ◽  
Swine Feces ◽  
Removal Efficiencies ◽  
Cu And Zn ◽  
Oxalic Acids

Cu and Zn are known to be abundant in swine feces; hence, concentrations of these metals need to be lowered before swine feces are applied to land in order to prevent potential environmental problems. The main objective of this study was to develop an appropriate chemical process to remove Cu and Zn from swine feces using acid extractions. The removal efficiencies of Cu and Zn decreased in the order of H2SO4 > HNO3 > organic acids (citric and oxalic acids). Owing to the highest removal efficiencies of Cu and Zn by using H2SO4, it was selected for further elimination of Cu and Zn from swine feces. By using H2SO4, the optimal concentration, solid-to-liquid ratio, and reaction time were 2%, 1:50, and 8 h, respectively. At the optimum conditions, Cu concentration was decreased from 198 mg/kg to 40.1 mg/kg and Zn concentration from 474 mg/kg to 80.0 mg/kg, with removal rates of 79.7% and 83.1%, respectively. The low Cu removal efficiency, resulting from the strong complexation between Cu and organic matter of swine feces, was improved by the increase in the reaction time and H2SO4 solution concentrations. However, about half of the total nitrogen (TN) was also removed by using H2SO4, indicating that the swine feces treated with H2SO4 may have poor value as fertilizer. Additional studies are required to find an optimal method to maintain TN concentrations while simultaneously removing Cu and Zn.

Microwave-Assisted Leaching Vanadium from Stone Coal

2011 ◽  
Vol 189-193 ◽  
pp. 3916-3919 ◽  
Author(s):  
Hong Zhou Ma ◽  
Xin Zhe Lan ◽  
Yao Ning Wang ◽  
Yu Hong Tian
Keyword(s):  
Sulfuric Acid ◽  
Microwave Power ◽  
Orthogonal Design ◽  
Chemical Constituents ◽  
Influence Factors ◽  
Sulfate Solution ◽  
Leaching Rate ◽  
Stone Coal ◽  
Microwave Assisted ◽  
Design Experiments

Technological process of microwave-assisted leaching of vanadium with sulfate solution has been defined on the base of phase and chemical constituents of stone coal. The influence factors such as content of sulfuric acid, microwave power, and leaching time were studied on leaching rate of vanadium from the stone coal. One element experiments and orthogonal design experiments are carried out to achieve optimized parameters. The experimental results showed that the leaching rate of vanadium was improved by the change of influence factors at some range. The single leaching rate of vanadium reached 80.9% under the optimal conditions of sulfuric acid content of 12%, microwave power 539w,leaching time of 2h.

Effect of Oxidant on the Leaching Rate of Indium from Water Quenching Slag

2013 ◽  
Vol 591 ◽  
pp. 122-125
Author(s):  
Li Jiao Yang ◽  
Si Chen ◽  
Yan Zhang ◽  
Nan Chun Chen ◽  
Jun Gao ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
Potassium Permanganate ◽  
Crystal Violet ◽  
Acid Leaching ◽  
Water Quenching ◽  
Test Results ◽  
Leaching Rate ◽  
Initial Concentration ◽  
Solid Ratio

Extracting indium from water quenching slag, which contains poor indium, by two process of leaching, the effect of different oxidants and dosages on the leaching rate of indium in water quenching slag were studied. The leaching conditions: temperature 80 °C, leaching time 2 h, the liquid to solid ratio of neutral leaching 8︰1, the liquid to solid ratio of acid leaching 2︰1, initial concentration of sulfuric acid 500 g·L-1, adding different oxidants, the concentration was detected by crystal violet spectrophotometry. Test results showed that the leaching rate of indium was significantly improved by adding hydrogen peroxide and potassium permanganate. Compared with the effect of different oxidants, the effect of potassium permanganate was significantly higher than that of hydrogen peroxide on the leaching rate of indium.

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