Understanding the Thickening Process
Underflow Solids Concentration, I(v/v) Solids Flux, (tonnes hour-1 m-2) Process 2 m bed (Flocculated) 5 m bed (Flocculated) Feed Concentration Gel Point (Flocculated) PE It was assumed that the thickener solids Disposal of the red mud residue produce a high underflow density was would require 100% raking to move produced in High Density red mud residue thickeners ScienceDirect
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Symmetry Free Full-Text Modelling of Red-Mud Particle-Solid
The paper evaluates the behavior of a red-mud solid fraction in a thickener feeder cup, aiming to identify the main characteristics of particle distribution in the 1. INTRODUCTION 1.1 The Bayer process In the 100-year-old Bayer process, used to produce alumina from bauxite ores, alumina hydrate is first extracted Control of the thickener operation in alumina production
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Understanding the Thickening Process ResearchGate
2 PRINCIPLES In simple terms, dewatering in a thickener involves gravity acting on the density difference between the solid particles and the carrier liquid (usually Abstract . The article describes the principle of a generalized mathematical model of the red mud’s thickener construction. The model of the red muds’ thickener of IOP Conference Series: Materials Science and
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Autoprecipitation Modelling in a Thickener ICSOBA
A batch of simulations are shown to demonstrate the impact of process variables such as feed volumetric flow, underflow solids concentration, and feed A/C ratio Achieving a more efficient red mud dewatering step is a sustainable and economical alternative to the safe disposal of this residue, because it allows a better Performances of two flocculants and their mixtures for red mud
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Numerical simulation and optimization of red mud
1 Introduction In Bayer alumina production process, one of the important steps is the solid-liquid separation by which the particulate red muds are removed from Both of these papers include some proposals on how to quantify the variability of thicker underflow solids concentration and flowrate, based on the limited available recorded data Thickener performance variability: underflow solids
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Understanding the Thickening Process ResearchGate
The model predicts that at the operational flux, the red mud would achieve an underflow solids concentration less than the gel point. The reality is an underflow solids concentration in excess ofprocess variables such as feed volumetric flow, underflow solids concentration, and feed A/C are terms that represent the processed red mud; m is the solids concentration in g/L; E. 3 and E 1 are the activation energies; It naturally differentiates the liquor compositions of the overflow and underflow leaving the thickener. Autoprecipitation Modelling in a Thickener ICSOBA
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Understanding the Thickening Process ResearchGate
The model predicts that at the operational flux, the red mud would achieve an underflow solids concentration less than the gel point. The reality is an underflow solids concentration in excess ofAbstract. Red mud is a by-product of alumina extraction from bauxite ore. It contains high quantities of alkali, minerals, and metal ions, which are typically pumped as thick slurry to a residue disposal area. Dry cake disposal is the most preferred technique for the disposal of red mud, which reduces the environmental impact.Mechanical dewatering of red mud ScienceDirect
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Sustainability Free Full-Text Sustainable Management of
Important independent variables in thickener operation include: (i) underflow rate (U/F), (ii) feed solids rate (FR) and (iii) flocculent dosage to the feed tailings stream (FD). Underflow rate will determine the throughput of the thickener affecting the residence time and tailings product quality (density and Cw). Flocculent dosage affects The hierarchical cone thickener is a critical device for paste filling in the mining industry ( Fang et al., 2022, Huan et al., 2019, Tan et al., 2015 ). The current mining and paste-filling industry still faces some thorny challenges. For example, the underflow concentration of the cone thickener system (CTS) directly determines the quality ofDualLSTM: A novel key-quality prediction for a hierarchical cone thickener
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final underflow solids red mud thickener feed solids
High Density red mud residue thickeners ScienceDirect It was assumed that the thickener solids Disposal of the red mud residue produce a high underflow density was would require 100% raking to move produced in the Bayer process is an the preferable approach Some general them to the underflow withdrawal operational requirement faced by all residue Experiments conducted by Gladman et al. (2010) argued that a larger underflow solids flux could be achieved for a given underflow solids volume fraction at a given bed height in densified thickeners. There is therefore an interest in finding how densification affects the maximum permitted underflow solids flux in a densified thickener.Mathematical modelling of time-dependent densified
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(PDF) Understanding the Thickening Process Academia.edu
The reality is an underflow solids concentration in excess of the gel point and indeed, in this case, the material had a yield stress approaching 100 Pa. 3.2 Operational outcomes Analysis of a range of industrial thickeners from the processing of gold ores, red mud, coal tailings, potable water sludge and clay suspensions shows that currentThe solids settle to a more concentrated slurry zone towards the underflow at the thickener base, while relatively solids free liquid rises to the overflow at the top. Predictive modelling of gravity thickener performance from experimentally determined material properties has been shown to under predict throughput by a factor of up to 100.Theoretical analysis of aggregate densification: Impact on thickener
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Thickeners versus centrifuges a coal tailings technical
feed percent solid produces faster settling rates, moreover, as the particle size of the feed becomes finer, the optimum feed solids concentration tends to decrease. Recently in a report completed by the Australian Coal Industry Research Program (Bickert & Langer 2012), it was found that the feed to a thickener greatly impacted the underflowThe results of pressure filtration testing demonstrates that, unlike traditional vacuum filters, standard design FLSmidth AFP IV™ filter presses can dewater red mud thickener underflows from initial concentrations of between 30–44 wt% to produce final cakes containing up to 80 wt% solids.Red mud pressure filtration for the alumina refinery’s bauxiteRed
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Control of the thickener operation in alumina production
Bayer process flowsheet W4Sh W4ter 1417 1418 Y.L. Sidrak 1.2 The operation of thickeners The aim of the thickeners is to separate the bulk of the red mud from the desanded slurry before pumping the turbid liquor to security filtration. A secondary target is to have as high as practicable a solids content in the mud at the bottom of the thickeners.The flow patterns and solid red mud distribution in the thickener were analyzed and the arrangements for the overflow weir and feed inlet for feedwell proposed. The simulation results wereEffect of mineralogy on the yield stress profiles of nickel
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© Copyright 2006, Australian Centre for Geomechanics
Underflow Solids Concentration, I(v/v) Solids Flux, (tonnes hour-1 m-2) Process 2 m bed (Flocculated) 5 m bed (Flocculated) Feed Concentration Gel Point (Flocculated) PE factor = 16.3 Figure 3 Red mud thickener performance and model prediction of the solids flux versus observed underflow solids volume fraction. The The high concentration bottom flow of the deep-cone thickener is fully stirred with water and cementitious materials in a mixing bucket according to a certain backfill ratio to prepare qualifiedThe solids concentration distribution in the deep cone thickener
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Theoretical analysis of aggregate densification: Impact on thickener
These changes increased the solids concentration of the underflow from 49.0% to 56.9%, decreased the overflow solids concentration from 0.6 % to values smaller than 0.01% and resulted in aThe theory (which permits discrete jumps in solids fraction) then predicts (Talmage and Fitch, 1955) one jump from at or around the feed solids fraction to some higher operating solids fraction corresponding to the hindered settling zone within the thickener, and then yet another jump in solids fraction at the underflow.Effects of aggregate densification upon thickening of
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Steady state thickener modelling from the compressive yield
For a number of operating industrial thickeners processing flocculated red mud, the thickener dimensions, operating parameters and characterised material properties have been used as inputs to the steady state thickening algorithm by Usher [2]. The predictions of solids flux versus underflow solids concentration highlight that most. @article{osti_1344403, title = {Numerical simulation and optimization of red mud separation thickener with self-dilute feed}, author = {Zhou, Tian and Li, Mao and Zhou, Chenn-qian and Zhou, Jie-min}, abstractNote = {In order to acquire the flow pattern and investigate the settling behavior of the red mud in the separation thickener, Numerical simulation and optimization of red mud separation thickener
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