scholarly journals Agglomeration-Flotation of Finely Ground Chalcopyrite and Quartz: Effects of Agitation Strength during Agglomeration Using Emulsified Oil on Chalcopyrite

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 380 ◽  
Author(s):  
Vothy Hornn ◽  
Mayumi Ito ◽  
Hiromasa Shimada ◽  
Carlito Baltazar Tabelin ◽  
Sanghee Jeon ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Air Bubbles ◽  
Flotation Kinetics ◽  
Collision Efficiency ◽  
Mineral Particles ◽  
Emulsified Oil ◽  
Flotation Recovery ◽  
Median Diameter

In flotation, the size of mineral particles is one of the most important parameters: when the size becomes fine, collision efficiency of the particles and air bubbles becomes low, causing low flotation recovery. To improve the collision efficiency and flotation kinetics, agglomeration using the emulsified oil of finely ground chalcopyrite (D50 = 3.5 μm) was carried out before flotation. In this study, the effects of agitation strength during agglomeration, kerosene dosage and potassium amyl xanthate (KAX) dosage on the flotation were investigated. Agglomeration using emulsified oil improved Cu recovery because the median diameter of agglomerate increased. With increasing agitation strength, KAX and kerosene dosages, Cu recovery was further increased. Agglomeration-flotation of a mixture containing chalcopyrite and quartz with 1:1 ratio (w/w, weight by weight) showed that Si recovery in froth was low and did not change with varying conditions (agitation strength, KAX and kerosene dosages); however, Cu recovery was significantly improved with increasing agitation strength, KAX and kerosene dosages, and thus the separation efficiency was improved.

scholarly journals Numerical Simulation and Experimental Research on Coal Ash Collecting and Grading System

2014 ◽  
Vol 2014 ◽  
pp. 1-12
Author(s):  
Yuanhua Xie ◽  
Xianjin Li ◽  
Liwei Wang ◽  
Hong Yu ◽  
Bing Bai ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Economic Value ◽  
Coal Ash ◽  
Grading System ◽  
Two Phase ◽  
Optimal Experiment ◽  
Median Diameter ◽  
Fluent Software ◽  
Theoretical Results ◽  
Separation Parameters

The grading separation of coal ash can not only increase its economic value but also decrease its pollution to environment. Based on the jet-attracting flow technology and the gas-solid two-phase flow theory, the force and motion of coal ash particles in airflow were studied firstly. Focused on single coal ash particle, Matlab software was used to simulate the force conditions and separation parameters of various diameter coal ash particles in airflow. Fluent software was used to simulate the nozzle fluidization domain shape and to determine optimal jet flux. According to the theoretical results, a coal ash collecting and grading system was developed. Using the separation efficiency as the evaluation index, the optimal experiment parameters of jet flux, attracting flux, and separation time were obtained. At last, the calculated results and experimental results of coal ash particles median diameter from the first grading separation exit under various attracting fluxes were compared. The reasons that could cause the errors were discussed. This study has significant practical meaning and application value on coal ash collecting and grading separation.

scholarly journals Particle separation from road runoff by a decentralised lamella system – laboratory tests and experiences in the field

2017 ◽  
Vol 75 (9) ◽  
pp. 2056-2063 ◽  
Author(s):  
J. Fettig ◽  
V. Pick ◽  
H. Liebe
Keyword(s):  
Laboratory Tests ◽  
Separation Efficiency ◽  
Particle Separation ◽  
Field Studies ◽  
Test Methods ◽  
Road Runoff ◽  
Test Procedures ◽  
Mineral Particles ◽  
Settling Behaviour ◽  
Organic Particles

A new decentralised settling system based on the principle of lamella separation was developed for the treatment of road runoff. Two different laboratory test methods, the DIBt (Deutsches Institut für Bautechnik) procedure and our own approach, were applied in order to evaluate the efficiency of the system based on the separation of fine mineral particles and a mixture of mineral and organic particles, respectively. Overall efficiencies (88% after DIBt and 61% according to our own method) were comparable to results obtained for commercial systems. The lamella system was then applied in the field for 1 year to treat runoff from a road area of 420 m2. The amount of solids separated that was calculated from a mass balance (10.1 kg) was consistent with the amount of sediments measured (8.6 kg). However, the average separation efficiency was only 30% in the field study. This is related to the size and composition of the particles in runoff, which are not represented well by the material used for the test procedures. It is concluded that the test methods should be improved, and that more field studies are needed in order to obtain a better understanding of the settling behaviour of particles in road runoff.

Design of Laboratory Type Ring Inflatable Flotation Machine

2013 ◽  
Vol 721 ◽  
pp. 652-655
Author(s):  
Lin Lin Yang ◽  
Xiu Ying Tang ◽  
Jie Shi ◽  
Huan Zou ◽  
Xi Wang
Keyword(s):  
Inflation Rate ◽  
Size Range ◽  
Air Bubbles ◽  
Flotation Machine ◽  
Flotation Column ◽  
Advantages And Disadvantages ◽  
Mineral Particles ◽  
Large Size ◽  
Low Energy Consumption ◽  
New Type

This paper summarized the current advantages and disadvantages of flotation column, put forward a new type of flotation device - ring inflatable flotation machine, the overall structure of the device has been designed and patented. The study of the ring inflatable flotation machine has the advantages of low energy consumption and little abrasion, inflation rate, the probability of attachment and collision is high of mineral particles and air bubbles, selection and sweep the election time and frequency adjustment flexibility and large size range of separation.

scholarly journals Potential Evaluation of PVDF/PAN Membranes for Separation of Oil from Industrial Waste

2021 ◽  
Vol 15 (1) ◽  
pp. 18-30
Author(s):  
Jigesh Mehta ◽  
Deepak S. Panwar ◽  
Anand Metre ◽  
Mathurkumar S. Bhakhar
Keyword(s):  
Separation Efficiency ◽  
Aqueous Sodium Hydroxide ◽  
Inversion Method ◽  
Wastewater Remediation ◽  
Practical Applications ◽  
Emulsified Oil ◽  
Potential Evaluation ◽  
Oil Water ◽  
Phase Inversion Method ◽  
Wide Potential

Aim: The aim of the experiment is to characterize the Modified Membrane from PVDF/PAN and its application in removing the Emulsified oil waste from the Industry. Objective: To get the maximum separation of the emulsified oil from the waste water, composite (PVDF/PAN) membrane was prepared in the laboratory. Methods: New PVDF/PAN blend based ultrafiltration membranes were synthesized by phase inversion method. The blend membrane was treated at room temperature with aqueous sodium hydroxide solutions. Results: The facile eco-friendly preparation of PVDF/PAN blended membrane has a wide potential for practical applications in emulsified wastewater remediation. The chemical functionality of the modified membranes was confirmed by IR spectra. Conclusion: For the separation of emulsified oily wastewater, the as-prepared composite (PVDF/PAN) membrane could effectively separate oil/ water emulsions with separation efficiency of above 99.8%. Unmodified membranes (A and B) showed 95.4-99.8% rejection. However, in the case of membranes C and D, oil rejection was higher for the modified membranes as compared to the unmodified membranes.

Separation of Emulsified Oil from Industrial Wastewater Using Poly Silicate Ferro-Aluminum Sulphate (PSFAS): A Novel Methodology for the Attainment of Very High Separation Efficiency

2021 ◽  
Author(s):  
Anup Kumar Bairagi ◽  
Kollati Prudhvi Ravikumar ◽  
Abanti Sahoo ◽  
Soumya Sanjeeb Mohapatra ◽  
Sangam Agrawal
Keyword(s):  
Industrial Wastewater ◽  
Metal Content ◽  
Separation Efficiency ◽  
Contaminated Water ◽  
Emulsified Oil ◽  
Aluminum Sulphate ◽  
Very High ◽  
High Separation ◽  
Maximum Separation

Abstract The large amount of wastewater generated from textile industries, petroleum industries, chemical industries contains heavy metals, suspended solids, hazardous waste, oils, fatty acids, dyes, pigment etc. It is very important to improve the quality of contaminated water before it discharges into the water sources or use. In the current work, an efficient methodology has been developed to separate emulsified oil from wastewater. The emulsified oil is tried to separate by using poly silicate Ferro aluminium sulphates, a flocculent. In addition to the above, the maximum separation efficiency for the devolved process is also revealed. Using PSFA, up to 93.5 % separation efficiency is achieved, and the discussed methodology can separate emulsified forms of the oil without altering the efficiency. The dissolved solid and metal content are also considered as the controlling parameters for the separation efficiency. The optimum TDS and the metal content must be maintained at 560 mg/L and 2 mg/L, respectively, to attain maximum separation efficiency.

scholarly journals Agglomeration–Flotation of Finely Ground Chalcopyrite Using Emulsified Oil Stabilized by Emulsifiers: Implications for Porphyry Copper Ore Flotation

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 912
Author(s):  
Vothy Hornn ◽  
Mayumi Ito ◽  
Hiromasa Shimada ◽  
Carlito Baltazar Tabelin ◽  
Sanghee Jeon ◽  
...  
Keyword(s):  
Fine Particles ◽  
Porphyry Copper ◽  
Sodium Dodecyl ◽  
Tween 20 ◽  
Dramatic Improvement ◽  
Porphyry Copper Deposits ◽  
Collision Efficiency ◽  
Copper Ore ◽  
Emulsified Oil ◽  
Average Size

Flotation is the conventional method for processing porphyry copper deposits, one of the most economically important sources of copper (Cu) worldwide. The rapidly decreasing grade of this type of Cu ore in recent years, however, presents serious problems with fine particle recovery using conventional flotation circuits. This low recovery could be attributed to the low collision efficiency of fine particles and air bubbles during flotation. To improve collision efficiency and flotation recovery, agglomeration of finely ground chalcopyrite (CuFeS2) (D50 = 3.5 μm) using emulsified oil stabilized by emulsifiers was elucidated in this study. Specifically, the effects of various types of anionic (sodium dodecyl sulfate (SDS), potassium amyl xanthate (KAX)), cationic (dodecyl amine acetate (DAA)), and non-ionic (polysorbate 20 (Tween 20)) emulsifiers on emulsified oil stability and agglomeration–flotation efficiency were investigated. When emulsifiers were added, the average size of agglomerates increased, resulting in higher Cu recovery during flotation. This dramatic improvement in flotation efficiency could be attributed to the smaller oil droplet size in emulsified oil and their higher stability in the presence of emulsifiers. The utilization of emulsifiers during agglomeration–flotation not only lowered the required agitation strength for agglomeration but also shortened the agglomeration time, both of which made the process easier to incorporate in existing flotation circuits.

scholarly journals Effect of Bubble Surface Properties on Bubble–Particle Collision Efficiency in Froth Flotation

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 367 ◽  
Author(s):  
Shuofu Li ◽  
Kou Jue ◽  
Chunbao Sun
Keyword(s):  
Surface Properties ◽  
Froth Flotation ◽  
Surfactant Solution ◽  
Terminal Velocity ◽  
Bubble Surface ◽  
Particle Collision ◽  
Film Rupture ◽  
Collision Efficiency ◽  
Mineral Particles ◽  
Bubble Collision

In research on the particle–bubble collision process, due to the adsorption of surfactants and impurities (such as mineral particles, slime, etc.), most studies consider the bubble surface environment to be immobile. However, in the real situation of froth flotation, the nature of the bubble surface (degree of slip) is unknown. Mobile surface bubbles increase the critical thickness of the hydration film rupture between particles and bubbles, and enhance the collision between particles and bubbles. Sam (1996) showed that when the diameter of the bubble is large enough, a part of the surface of the bubble can be transformed into a mobile state. When the bubble rises in a surfactant solution, the surface pollutants are swept to the end of the bubble, so when the bubble reaches terminal velocity, the upper surface of the bubble is changed into a mobile surface. This paper analyzes the collision efficiency and fluid flow pattern of bubbles with mobile and immobile surfaces, and expounds the influence of surface properties on collision efficiency.

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