scholarly journals Evaluation of Frother Types for Improved Flotation Recovery and Selectivity

Minerals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 590 ◽  
Author(s):  
Qingqing Huang ◽  
Xinbo Yang ◽  
Rick Q. Honaker
Keyword(s):  
Froth Flotation ◽  
Plug Flow ◽  
Test Results ◽  
Combustible Material ◽  
Mixing Conditions ◽  
Flotation Column ◽  
Fundamental Properties ◽  
Flow Mixing ◽  
Three Phase ◽  
Ultrafine Coal

A laboratory study was conducted to evaluate and compare the effectiveness of nine different frother types when used in a three-phase, continuously operating froth flotation system. The frothers included several that are commonly used in the industry (e.g., MIBC, 2EH, and F-1) as well as unique frother types (e.g., F-3). The tests were conducted in a 5-cm diameter laboratory flotation column that provided near plug-flow mixing conditions due to a length-to-diameter ratio of around 50:1. Test results indicate that F-1, MIBC, and MPC (in order of decreasing effectiveness) provided the weakest performance in terms of combustible recovery while F-2, MAC, and 2EH were the top three generating the highest separation efficiencies. When processing ultrafine coal, the ash content of the flotation concentrate ranged from 10% to 15% while recovering over 80% of the combustible material. F-3, F-4, and DIBC provided over 80% recovery of combustibles at the expense in the amount of hydraulic entrainment. The flotation performances were also closely examined in accordance with the fundamental properties of the nine tested frothers, and their correlations were addressed in detail.

Frequency-Response Approach to Modelling Continuous Reactors

1971 ◽  
Vol 6 (1) ◽  
pp. 249-272
Author(s):  
P.B. Melynk ◽  
J.D. Norman ◽  
A.W. Wilson
Keyword(s):  
Frequency Response ◽  
Flow Model ◽  
Plug Flow ◽  
Order Reaction ◽  
Parameter Estimates ◽  
Second Order Reaction ◽  
Mixing Conditions ◽  
Bode Plot ◽  
Flow Through ◽  
Search Routine

Abstract It is postulated that the mixing conditions in a flow-through reactor can be characterized as having either completely mixed, completely plug flow, or some network of completely mixed and plug flow component vessels. A frequency-response technique is used to obtain an experimental Bodé plot for arbitrarily mixed vessels. The interpretation of the Bodé plot is discussed, and , in light of this interpretation, a network of plug flow and completely mixed components is specified as a flow model. A Rosenbrock search routine is used to improve the parameter estimates of the model. To verify the model, a second order reaction was run through the vessel and the experimentally measured conversion was compared to that predicted by the model. It is shown that the modeling technique, in addition to describing the mixing in the system, will indicate inactive volume, as well as measure the extent of any channeling or short circuiting in the reactor.

Floc-flotation of ultrafine coal slimes achieved by flotation column

2017 ◽  
Vol 39 (9) ◽  
pp. 899-904 ◽  
Author(s):  
Quanzhi Tian ◽  
Yi Zhang ◽  
Guosheng Li ◽  
Yongtian Wang
Keyword(s):  
Flotation Column ◽  
Ultrafine Coal

Wind-Driven SEIGs for Supplying Isolated Loads Employing DSP Based Power Electronic Controllers

2012 ◽  
Vol 36 (6) ◽  
pp. 739-757 ◽  
Author(s):  
S. Senthilkumar ◽  
N. Kumaresan ◽  
N. Rakesh ◽  
K. Vijayakumar ◽  
M. Subbiah
Keyword(s):  
Wind Speed ◽  
Test Results ◽  
Power Requirement ◽  
Induction Generators ◽  
Detailed Method ◽  
Three Phase ◽  
Control Scheme ◽  
Bridge Rectifier ◽  
Constant Magnitude ◽  
Set Up

A DSP based closed-loop system has been developed for wind-driven three-phase Self-Excited Induction Generators (SEIGs) using a diode bridge rectifier (DBR) followed by an IGBT inverter. This system is meant for supplying isolated ac loads with a voltage of constant magnitude and frequency, for any operating condition of varying nature of wind speed and consumer load. The configuration and implementation of this proposed system have been fully described. The detailed method of analysing and predetermining the performance characteristics of such stand-alone systems has also been explained. Test results obtained on an SEIG operated with the controller built in the laboratory, demonstrate the successful working of both the hardware and software of the control scheme and the usefulness of the set-up as a whole for supplying isolated ac loads. With the varying nature of wind speed, a method of meeting the power balance between the wind power available and the load power requirement has also been explained with extensive Simulation studies.

Method of Judging the Energy Measurement Device Error Wiring Based on Checking Tables

2010 ◽  
Vol 139-141 ◽  
pp. 2247-2251
Author(s):  
Xing Zhong Zhang
Keyword(s):  
Phase Angle ◽  
Energy Measurement ◽  
Test Results ◽  
Measurement Device ◽  
Electric Parameter ◽  
Simple Method ◽  
Line Voltage ◽  
Three Phase ◽  
Working Efficiency

Focused on the complexity and Time-consuming of judging the error wiring of the energy measurement device, It extracts a series of electric parameter tables including phase angle table, such as the voltage sequence table, the line voltage location table, phase angle transform table, and phase angle table. And proposes a simple method of judging the error wiring of Three-phase three-wire error wiring of two components energy measurement device. The method based only on the four tables, inspectors only need to look-up the tables in accordance with the measured dates and get the error wiring instead of drawing vector plots. Because these tables root from vector plots. It greatly simplifies inspectors to judge wiring mistake, improves the working efficiency and makes the test results more accurate.

Current-Fed Flyback Push-Pull DC-DC Converter Based on Three-Phase Transformer

2014 ◽  
Vol 614 ◽  
pp. 164-167
Author(s):  
You Chen Yuan ◽  
Yang Zhang ◽  
Yu Wei Chen
Keyword(s):  
Magnetic Flux ◽  
High Frequency ◽  
Magnetic Circuit ◽  
Magnetic Loop ◽  
Test Results ◽  
Static And Dynamic Characteristics ◽  
Three Phase ◽  
Independent Functions ◽  
Flow Through ◽  
Efficiency And Reliability

Three-phase current-fed flyback push-pull dc-dc converter is proposed in this paper, which is a new circuit topology putting into practice based on current-fed flyback push-pull dc-dc converter. Structure is simplified; cost is cut down; efficiency and reliability are improved all by the high frequency three-phase transformer technique that carries out functions of flyback transformer as well as push-pull transformer at the same time. Three-phase transformer can be separated into relatively independent functions of flyback transformer and push-pull transformer with the reluctance produced by the magnetic gap in the central phase; the flyback transformer produces only common-mode flux in the magnetic circuit of push-pull transformer and does not influence its output signal; the magnetic flux in push-pull transformer is blocked by the magnetic gap and can only flow through the outer magnetic loop. Investigational device is designed; static and dynamic characteristics are observed and test results are verified by the experimentation.

scholarly journals Parachute structure trisiloxane surfactant: synthesis and its use in reverse flotation of iron ore

2021 ◽  
Author(s):  
Zhiqiang Huang ◽  
Shiyong Zhang ◽  
Vladimir E. Burov ◽  
Hongling Wang ◽  
Rukuan Liu ◽  
...  
Keyword(s):  
Density Functional ◽  
Chemical Reactivity ◽  
Froth Flotation ◽  
Density Functional Theory Calculations ◽  
Raw Material ◽  
Mulliken Charge ◽  
Single Element ◽  
Test Results ◽  
Functional Theory ◽  
Flotation Process

Abstract No single element has exerted such a deep influence on social organization of mankind as iron. Magnetite is concentrated by froth flotation and used as a raw material to produce iron. However, the conventional surfactants used in the flotation process often lead to the weak collecting performance due to their analogous alkyl hydrophobic group. Here, we report a new trisiloxane surfactant N-(β-aminoethyl)-γ-aminopropyltrisiloxane (AAT) in magnetite flotation, which was compared with the traditional collector dodecylamine (DA). The flotation test results showed that AAT had excellent collecting ability and selectivity for quartz against magnetite. Magnetite concentrate with TFe recovery of 84.79%, TFe grade of 68.84% and SiO2 grade of 6.15% was obtained by using 150 g/t AAT. Density functional theory calculations suggested reactive site of AAT was cationic –CH2N+H3 group, and AAT showed a higher positive grouping Mulliken charge and chemical reactivity that may promote its flotation performance.

scholarly journals Possibilities of Tetrahedrite Separation from Polymetallic Ore

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Michal MARCIN ◽  
Martin SISOL ◽  
Peter VARGA ◽  
Ivan BREZÁNI ◽  
Michal MAŤAŠOVSKÝ ◽  
...  
Keyword(s):  
Froth Flotation ◽  
Gravity Separation ◽  
Shaking Table ◽  
Second Step ◽  
Flotation Column ◽  
Efficient Separation ◽  
Polymetallic Ore

Using the separation methods, the tetrahedrite concentrate, which contains multiple elements, was obtained from the tetrahedrite ore.We focused mainly on copper, but also on iron and antimony. Ore also contains undesirable elements such as arsenic or mercury. Theaim of this paper is an efficient separation of the utility components. Gravity separation and flotation was used. The first processingstep was gravity separation on shaking table the second step was froth flotation in flotation column.

Biological wastewater treatment by three-phase fluidization - characteristics and basic design method

1994 ◽  
Vol 30 (11) ◽  
pp. 91-100 ◽  
Author(s):  
Akira Hirata ◽  
Motoharu Noguchi
Keyword(s):  
Fluidized Bed ◽  
Design Method ◽  
Research Work ◽  
Plug Flow ◽  
Oxygen Absorption ◽  
Basic Design ◽  
Fluidized Bed Bioreactor ◽  
Particulate Media ◽  
Flow Type ◽  
Three Phase

A three-phase fluidized bed bioreactor is expected to treat wastewater quite efficiently, because the reactor has large specific surface area of biofilm, and oxygen for the biodegradation is simultaneously supplied from gas to liquid with oxygen consumption for biooxidation. However the reactor design and operation had been quite difficult particularly with a plug flow type fluidized bed, because of complicated behavior in the reactor. This paper concerns the current research work by the authors in focusing on the following characteristics and basic design method: (1) Behavior of biofilm immobilization on particulate media, fluidization of immobilized biofilm media and characteristics of oxygen absorption and substrates biodegradation. (2) Characteristics of biological treatment by immobilized biofilm. (3) Basic design method of a plug flow type three-phase fluidized bed bioreactor.

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