A facile disposal of Bayer red mud based on selective flocculation desliming with organic humics

Huang, Yanfang; Han, Gaorong; Liu, Jiongtian; Wang, Wenjuan

doi:10.1016/j.jhazmat.2015.08.035

Cited by 55 publications

(6 citation statements)

References 26 publications

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“…These two steps turn RM into a nonhazardous and near-neutral residue that can be used for building material production. In addition to the lime method, acid leaching [60], three-waste neutralization [61], membrane desodium [62], suspension carbonization [63], selective flocculation [64], and other domestic processes, salt leaching [65], bacterial leaching [66], and foreign processes are available for alkali removal in RM.…”

Section: Technology Of Removing Sodium and Extracting Aluminum From Rmmentioning

confidence: 99%

A Review on Comprehensive Utilization of Red Mud and Prospect Analysis

et al. 2019

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Red mud (RM) is a by-product of extracting of alumina from bauxite. Red mud contains high quantities of alkali-generating minerals and metal ions, which can cause significant environmental damage. Many valuable components such as rare-earth elements, Al, and Fe, in RM are difficult to be utilized owing to their particle size and alkalinity. Thus, developing an economical and efficient technology to consume a large amount of RM can efficiently solve RM disposal issues. This paper systematically reviews the comprehensive utilization methods for reducing RM environmental pollution and divides the comprehensive utilization of RM into three aspects: the effective extraction of valuable components, resource transformation, and environmental application. Based on resource, economic, and environmental benefits, the development of new technologies and new processes with market competitiveness, environmental protection, and ecological balance should be the prerequisite for the low-energy, low-pollution, low-cost, and high-efficiency comprehensive utilization of RM. The direction of future research to solve RM disposal issues is also suggested.

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Section: Technology Of Removing Sodium and Extracting Aluminum From Rmmentioning

confidence: 99%

A Review on Comprehensive Utilization of Red Mud and Prospect Analysis

et al. 2019

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“…As flocculants increase, the recovery could reach a maximum. This is because too little flocculant is ineffective, while too much flocculant causes excessive adsorption on particle surfaces, breaking up initially aggregated colloids, in a process called "colloid protection" [13] or "over-dosing" effect. Figure 9b shows the effects of flocculant types and amounts on iron grades, which while less significant, still display an increase over the results without flocculants.…”

Section: Flocculation Testsmentioning

confidence: 99%

Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores

Chen

Zhang

et al. 2016

Minerals

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Abstract:Simple magnetic separation for a certain magnetite mine with ultrafine disseminated lean ores has resulted in low performance, as the fine sizes and aggregation of ground mineral particles have caused inefficient recovery of the ultrafine minerals. In this study, we attempt to increase the apparent sizes of target mineral particles, and improve the separation indices, by using a multi-stage grinding-dispersion-selective flocculation-weak magnetic separation process. The results showed that under the conditions of 500 g/t sodium hexametaphospate (SHMP) as dispersant, 750 g/t carboxymethyl starch (CMS) as flocculant, agitating at 400 rpm for 10 min, with slurry pH 11, and final grinding fineness of 93.5% less than 0.03 mm, the obtained concentrate contained 62.82% iron, with recovery of 79.12% after multi-stage magnetic separation. Compared to simple magnetic separation, the concentrate's iron grade increased by 1.26%, and a recovery rate by 5.08%. Fundamental analysis indicated that, in a dispersed state of dispersion, magnetite particles had weaker negative surface charges than quartz, allowing the adsorption of negative CMS ions via hydrogen bonding. Consequently, the aggregate size of the initial concentrate increased from 24.30 to 38.37 µm, accomplishing the goal of selective flocculation, and increasing the indices of separation.

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“…e Bayer red mud (BRM), also called as bauxite residue, is a hazardous solid waste generated during the Bayer alumina extraction from bauxite ore [1,2]. It generally exists as a highly alkaline slurry (Ph 10-12.5) that is appropriately regarded as a hazardous material [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Studies on the Creep Behavior of Bayer Red Mud

Zhao

Huang

Shu

et al. 2018

Advances in Civil Engineering

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Long-term stability and safety of the Bayer red mud (BRM) disposal field is very important for the local residents’ life, which necessitates the knowledge of its creep behavior. In order to investigate the creep behavior of BRM, a series of triaxial drained creep tests were conducted by using an improved triaxial creep apparatus. The results indicate that the creep behavior of BRM is significant with confining and deviatoric stresses being critical factors. The creep strain is in a nonlinear relationship with stress and time, and a larger deviator stress will lead to a larger creep strain. The main failure mechanism of BRM is plastic shear, accompanied by a significant compression and ductile dilatancy. Based on the test results, two well-established creep models, the Burgers creep model and Singh–Mitchell creep model, were used to comparatively analyze the creep behavior of the Bayer red mud under a certain stress level. Then, an improved Burgers creep damage constitutive model with the addition of a damage variable was proposed, whose parameters were also analyzed in detail. The comparison of the calculated values of the creep model and the experimental values shows that the proposed creep damage model can better describe the instant elastic deformation, attenuation creep, steady-state creep, and accelerated creep stages of the Bayer red mud.

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A facile disposal of Bayer red mud based on selective flocculation desliming with organic humics

Cited by 55 publications

References 26 publications

A Review on Comprehensive Utilization of Red Mud and Prospect Analysis

A Review on Comprehensive Utilization of Red Mud and Prospect Analysis

Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores

Experimental and Theoretical Studies on the Creep Behavior of Bayer Red Mud

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