The Experts below are selected from a list of 10593 Experts worldwide ranked by ideXlab platform
Ravi Naidu - One of the best experts on this subject based on the ideXlab platform.
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Hidden values in bauxite residue (Red Mud): Recovery of metals
Waste Management, 2014Co-Authors: Yanju Liu, Ravi NaiduAbstract:Bauxite residue (Red Mud) is a hazardous waste generated from alumina refining industries. Unless managed properly, Red Mud poses significant risks to the local environment due to its extreme alkalinity and its potential impacts on surface and ground water quality. The ever-increasing generation of Red Mud poses significant challenges to the aluminium industries from management perspectives given the low proportion that are currently being utilized beneficially. Red Mud, in most cases, contains elevated concentrations of iron in addition to aluminium, titanium, sodium and valuable rare earth elements. Given the scarcity of iron supply globally, the iron content of Red Mud has attracted increasing research interest. This paper presents a critical overview of the current techniques employed for iron recovery from Red Mud. Information on the recovery of other valuable metals is also reviewed to provide an insight into the full potential usage of Red Mud as an economic resource rather than a waste. Traditional hydrometallurgy and pyrometallurgy are being investigated continuously. However, in this review several new techniques are introduced that consider the process of iron recovery from Red Mud. An integrated process which can achieve multiple additional values from Red Mud is much preferRed over the single process methods. The information provided here should help to improve the future management and utilization of Red Mud.
Xie Simin - One of the best experts on this subject based on the ideXlab platform.
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Red Mud phosphogypsum hydraulic road base course Red Mud phosphogypsum hydraulic road base course material and preparation method of Red Mud phosphogypsum hydraulic road base course material
2015Co-Authors: Huang Jinghua, Hu Haisen, Zhao Tingsong, Chen Jiang, Xie SiminAbstract:The present invention discloses a Red Mud phosphogypsum hydraulic road base course, a Red Mud phosphogypsum hydraulic road base course material and a preparation method of the Red Mud phosphogypsum hydraulic road base course material, and relates to the field of road engineering construction. The preparation method comprises: weighing 10-50% of phosphogypsum and 90-50% of Red Mud, and uniformly mixing and strring to obtain a primary mixing material; weighing 85-92% of the primary mixing material and 15-8% of ordinary Portland cement, and uniformly mixing and strring to obtain a premix; and weighing 99.7-99.95% of the premix and 0.3-0.05% of a hydraulic curing agent, uniformly mixing and strring to obtain a mixture, and controlling the water content of the mixture to 14-18% to obtain the base course material, wherein the hydraulic curing agent is obtained by mixing the following components by mass: 40-80% of an elastic styrene-acrylic emulsion, and 60-20% of nanometer silicon sol. According to the present invention, the road base course is prepaRed by using the road base course material according to the standard road base course construction method; the Red Mud and the phosphogypsum are used to produce the road base course material, such that the pollution of the Red Mud and the phosphogypsum on the environment is Reduced, and the waste is turned into treasure; and the formed road base course has characteristics of strong cracking resistance, corrosion resistance, and long service life.
Yanju Liu - One of the best experts on this subject based on the ideXlab platform.
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Hidden values in bauxite residue (Red Mud): Recovery of metals
Waste Management, 2014Co-Authors: Yanju Liu, Ravi NaiduAbstract:Bauxite residue (Red Mud) is a hazardous waste generated from alumina refining industries. Unless managed properly, Red Mud poses significant risks to the local environment due to its extreme alkalinity and its potential impacts on surface and ground water quality. The ever-increasing generation of Red Mud poses significant challenges to the aluminium industries from management perspectives given the low proportion that are currently being utilized beneficially. Red Mud, in most cases, contains elevated concentrations of iron in addition to aluminium, titanium, sodium and valuable rare earth elements. Given the scarcity of iron supply globally, the iron content of Red Mud has attracted increasing research interest. This paper presents a critical overview of the current techniques employed for iron recovery from Red Mud. Information on the recovery of other valuable metals is also reviewed to provide an insight into the full potential usage of Red Mud as an economic resource rather than a waste. Traditional hydrometallurgy and pyrometallurgy are being investigated continuously. However, in this review several new techniques are introduced that consider the process of iron recovery from Red Mud. An integrated process which can achieve multiple additional values from Red Mud is much preferRed over the single process methods. The information provided here should help to improve the future management and utilization of Red Mud.
Huang Jinghua - One of the best experts on this subject based on the ideXlab platform.
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Red Mud phosphogypsum hydraulic road base course Red Mud phosphogypsum hydraulic road base course material and preparation method of Red Mud phosphogypsum hydraulic road base course material
2015Co-Authors: Huang Jinghua, Hu Haisen, Zhao Tingsong, Chen Jiang, Xie SiminAbstract:The present invention discloses a Red Mud phosphogypsum hydraulic road base course, a Red Mud phosphogypsum hydraulic road base course material and a preparation method of the Red Mud phosphogypsum hydraulic road base course material, and relates to the field of road engineering construction. The preparation method comprises: weighing 10-50% of phosphogypsum and 90-50% of Red Mud, and uniformly mixing and strring to obtain a primary mixing material; weighing 85-92% of the primary mixing material and 15-8% of ordinary Portland cement, and uniformly mixing and strring to obtain a premix; and weighing 99.7-99.95% of the premix and 0.3-0.05% of a hydraulic curing agent, uniformly mixing and strring to obtain a mixture, and controlling the water content of the mixture to 14-18% to obtain the base course material, wherein the hydraulic curing agent is obtained by mixing the following components by mass: 40-80% of an elastic styrene-acrylic emulsion, and 60-20% of nanometer silicon sol. According to the present invention, the road base course is prepaRed by using the road base course material according to the standard road base course construction method; the Red Mud and the phosphogypsum are used to produce the road base course material, such that the pollution of the Red Mud and the phosphogypsum on the environment is Reduced, and the waste is turned into treasure; and the formed road base course has characteristics of strong cracking resistance, corrosion resistance, and long service life.
Dong-yan Liu - One of the best experts on this subject based on the ideXlab platform.
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Physical and Chemical Properties of Sintering Red Mud and Bayer Red Mud and the Implications for Beneficial Utilization
Materials, 2012Co-Authors: Ping Wang, Dong-yan LiuAbstract:Performances of two common types of Red Mud, Bayer Red Mud and Sintering Red Mud, were investigated in this research. Their compositions, mechanical properties and microstructure characterization were measuRed through XRD, TG and SEM analysis. Their shear strength, particle size, density and hydraulic characteristics also had been performed. Huge differences between the basic mineral types of these two kinds of Red Mud also can be found. The comparison of compositions shows that CaCO3 content in Sintering Red Mud is higher, Bayer Red Mud has more hazardous elements such as As, Pb and Hg and both have a high concentration of radioactivity. The micro particle of Bayer Red Mud is finer and more disperse, but the Sintering Red Mud has higher shear strength. Combining the TG and hydraulic characteristics analysis, it can be shown that Bayer Red Mud has higher value of water content and Sintering Red Mud has higher hydraulic conductivity. The paper then illustrates that Sintering Red Mud can become the main filling material of supporting structure of Red Mud stocking yard. Bayer Red Mud has a high reuse value and also can be used as a mixing material of masonry mortar.
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Stockpiling and Comprehensive Utilization of Red Mud Research Progress
Materials, 2012Co-Authors: Dong-yan LiuAbstract:With increasing production of Red Mud, the environmental problems caused by it are increasingly serious, and thus the integrated treatment of Red Mud is imminent. This article provides an overview of the composition and the basic characteristics of Red Mud. The research progress of safe stockpiling and comprehensive utilization of Red Mud is summarized. The safe stockpiling of Red Mud can be divided into two aspects: the design and safe operation of the stocking yard. The comprehensive utilization of Red Mud can be further divided into three aspects: the effective recycling of components, resource utilization and application in the field of environmental protection. This paper points out that the main focus of previous studies on Red Mud stockpiling is cost reproduction and land tenure. The recovery of resources from Red Mud has a high value-added, but low level industrialization. The use of Red Mud as a building material and filler material is the most effective way to Reduce the stockpiling of Red Mud. Red Mud used for environmental remediation materials is a new hotspot and worth promoting for its simple processing and low cost.
