scholarly journals Recovery of elemental sulfur from zinc concentrate direct leaching residue using atmospheric distillation: A pilot-scale experimental study

2013 ◽  
Vol 64 (1) ◽  
pp. 95-103 ◽  
Author(s):  
Hailong Li ◽  
Xiaolong Yao ◽  
Mingxia Wang ◽  
Shaokang Wu ◽  
Weiwu Ma ◽  
...  
Keyword(s):  
Experimental Study ◽  
Elemental Sulfur ◽  
Pilot Scale ◽  
Atmospheric Distillation ◽  
Leaching Residue ◽  
Direct Leaching ◽  
Zinc Concentrate

Separation of elemental sulfur from zinc concentrate direct leaching residue by vacuum distillation

2014 ◽  
Vol 138 ◽  
pp. 41-46 ◽  
Author(s):  
Hailong Li ◽  
Xianying Wu ◽  
Mingxia Wang ◽  
Jun Wang ◽  
Shaokang Wu ◽  
...  
Keyword(s):  
Vacuum Distillation ◽  
Elemental Sulfur ◽  
Leaching Residue ◽  
Direct Leaching ◽  
Zinc Concentrate

scholarly journals Sº and jarosite behavior during recovery of values from the direct leaching residue of sphalerite using cyanide and glycine

2021 ◽  
pp. 31-31
Author(s):  
N.G. Picazo-Rodríguez ◽  
F.R. Carrillo-Pedroza ◽  
Martínez Luévanos ◽  
M.J. Soria-Aguilar ◽  
I. Almaguer-Guzmán
Keyword(s):  
Hydrothermal Treatment ◽  
Elemental Sulfur ◽  
Extraction Process ◽  
Gold Extraction ◽  
Valuable Metals ◽  
Negative Effect ◽  
Leaching Residue ◽  
Direct Leaching ◽  
Cyanide Consumption ◽  
Silver Extraction

This paper reports the effect of the components of a direct leaching residue (jarosite and elemental sulfur), on the recovery of valuable metals such as gold and silver. Leaching media such as cyanide and mixtures of cyanide with glycine were used to recover the gold and silver from the residue; however, a low recovery of these metals was obtained. The above due to the negative effect of its components which cause problems in the extraction process such as encapsulation of silver (due to jarosite) and the formation of thiocyanate and re-precipitation of silver (due to sulfur). Various treatments prior to leaching were tested, finding that when the residue is desulfurized with perchlorethylene and subjected to an oxidizing alkaline hydrothermal treatment, the gold extraction increased from 39.73 to 88% and the silver extraction of 64.76 to 94.29%. Additionally, it was determined that when cyanide is assisted by glycine, the latter decreases the cyanide consumption by inhibition of the dissolution of iron and sulfur in cyanide.

Experimental Study on Utilization FGD Byproducts in Building Bricks

2010 ◽  
Vol 150-151 ◽  
pp. 753-757 ◽  
Author(s):  
Xiong Hao Li ◽  
Yong Jie Xue ◽  
Min Zhou
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Optimum Design ◽  
Power Plants ◽  
Pilot Scale ◽  
Mixture Composition ◽  
Technical Requirement ◽  
Do No Harm ◽  
Maximum Compressive Strength ◽  
Scale Experiment

This paper discussed the feasibility of unburned and non-autoclaved, steam cured bricks prepared by FGD byproducts from coal-fired power plants. The results show that FGD byproduct, aggregates, cementious materials and water could be used to prepare bricks during the process of stir and compaction under natural cure and steam cured condition. S4 and Z2 are the optimum design mixture composition. The maximum compressive strength and saturation coefficient are 28.7 MPa and 96.7%. FGD byproducts do no harm to environment and a pilot-scale experiment demonstrates that bricks made with FGDA can meet the MU10 level bricks technical requirement.

Flotation Experimental Study of High-Sulfur Cu-Zn Ore in Yunnan

2014 ◽  
Vol 490-491 ◽  
pp. 160-163
Author(s):  
Zhi Guo Zhang ◽  
Quan Jun Liu ◽  
Jin Cheng Ran
Keyword(s):  
Experimental Study ◽  
Mineral Composition ◽  
Recovery Rate ◽  
Closed Circuit ◽  
Copper Concentrate ◽  
Concentrate Grade ◽  
And Control ◽  
Zinc Concentrate

The experimental ore belongs to high-sulfur Cu-Zn poly-metallic ore, the mineral composition of ore is complex, cupriferous pyrite most are disseminated. The Cu grade of raw ore is 0.76%, Zn grade is 1.48% and S about 25.02%. on the basis of best reagent system and control flotation time, the author did closed circuit process. the results of closed circuit process as follows: the copper concentrate grade is 20.35% and recovery rate is 86.081%; the zinc concentrate grade is 54.32% and recovery rate is 84.20%.

Experimental Study on Concentrating Scandium by Leaching from Associated Scandium Ore

2013 ◽  
Vol 734-737 ◽  
pp. 1033-1036
Author(s):  
Gui Fang Zhang ◽  
Peng Yan ◽  
Qing Rong Yang
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Hydrochloric Acid Concentration ◽  
Leaching Rate ◽  
Optimal Conditions ◽  
Research Results ◽  
Solid Ratio ◽  
Leaching Residue

Based on the benefication of the complex silicate ore containing scandium, the research about aid-leaching agent used in the leaching of the scandium concentrate was been conducted. And the suitable leaching agent and aid-leaching agent which the useful ions entered into leaching liquid and the harmful ions were kept in leaching residue were been found according to the experiment results. For the scandium of sample existed various complex silicate ore as isomorphism form, the research has adopted hydrochloric acid with aid-leaching agent to dissociate the silicate ore and make scandium entering into solution. The research results has shown that the scandium leaching rate could reach 92.06% under the optimal conditions which the hydrochloric acid concentration is 22.8%, the dosage of aid leaching agent is 6%, liquid solid ratio is 4:1, particle size of leaching material totally is less than 0.15mm and leaching time is 8h.

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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