Chemical and physical control of the rheology of concentrated metal oxide suspensions

Zhou, Zhongwu; Scales, Peter J.; Boger, David V.

doi:10.1016/s0009-2509(00)00473-5

Cited by 248 publications

(190 citation statements)

References 131 publications

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“…Froth apparent viscosity decreases as chalcopyrite size in the feed increases. This is similar to what was previously observed by other researchers in two-phase suspensions [32,33] and it is therefore likely that this relationship also applies to a three-phase flotation froth. In addition, it is well known that fine particles have a higher recovery than coarse particles through the froth.…”

supporting

confidence: 91%

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

Farrokhpay

Runge

et al. 2016

Powder Technology

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Determining the significance of flotation variables on froth rheology using a central composite rotatable design, Powder Technology (2015Technology ( ), doi: 10.1016Technology ( /j.powtec.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractFroth performance in a flotation cell is expected to be affected by froth rheology due to change in the froth transportation rate. However, very little study has been performed to investigate how froth rheology responds to flotation variables. This paper presents an experimental program performed to study the effects of flotation variables (i.e. feed grade, feed particle size, froth height, superficial gas velocity and impeller speed) on the froth rheology. These conditions were varied using a central composite rotatable design (CCRD).

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supporting

confidence: 91%

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

Farrokhpay

Runge

et al. 2016

Powder Technology

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“…Zhou et al (1999) found that the shear strength (shear vane measurements on Al 2 O 3 slurries; see where K = a constant that relates bond strength to material properties and surface chemistry condition d = particle diameter  = UDS concentration by volume c = a fitting parameter. Poloski et al (2007) considered the functionality of the maximum shear strength in a tank with respect to particle size based on Zhou et al (2001). The relationship with slurry composition for waste types and shear strength was analyzed and it was found that, with the exception of the saltcake wastes, the shear strength increases with increasing concentration of the following species (in order of significance): zirconium compounds > boehmite > bismuth compounds > gibbsite > iron compounds.…”

Section: Shear Strength-particle Sizementioning

confidence: 99%

Hanford Waste Physical and Rheological Properties: Data and Gaps

Wells¹,

Kurath²,

Mahoney³

et al. 2011

103

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Executive SummaryThe Hanford Site in Washington State manages 177 underground storage tanks containing approximately 250,000 m 3 of waste generated during past defense reprocessing and waste management operations. These tanks contain a mixture of sludge, saltcake and supernatant liquids. The insoluble sludge fraction of the waste consists of metal oxides and hydroxides and contains the bulk of many radionuclides such as the transuranic components and 90 Sr. The saltcake, generated by extensive evaporation of aqueous solutions, consists primarily of dried sodium salts. The supernates consist of concentrated (5-15 M) aqueous solutions of sodium and potassium salts. The 177 storage tanks include 149 single-shell tanks (SSTs) and 28 double-shell tanks (DSTs).Ultimately the wastes need to be retrieved from the tanks for treatment and disposal. The SSTs contain minimal amounts of liquid wastes, and the Tank Operations Contractor is continuing a program of moving solid wastes from SSTs to interim storage in the DSTs. The Hanford DST system provides the staging location for waste feed delivery to the Department of Energy (DOE) Office of River Protection's (ORP) Hanford Tank Waste Treatment and Immobilization Plant (WTP). The WTP is being designed and constructed to pretreat and then vitrify a large portion of the wastes in Hanford's 177 underground waste storage tanks.The retrieval, transport, treatment and disposal operations involve the handling of a wide range of slurries. Solids in the slurry have a wide range of particle size, density and chemical characteristics. Depending on the solids concentration the slurries may exhibit a Newtonian or a non-Newtonian rheology.The extent of knowledge of the physical and rheological properties is a key component to the success of the design and implementation of the waste processing facilities. These properties are used in engineering calculations in facility designs. Knowledge of the waste properties is also necessary for the development and fabrication of simulants that are used in testing at various scales. The expense and hazards associated with obtaining and using actual wastes dictates that simulants be used at many stages in the testing and scale-up of process equipment. The results presented in this report should be useful for estimating process and equipment performance and provide a technical basis for development of simulants for testing.The purpose of this document is to provide an updated summary of the Hanford waste characterization data pertinent to safe storage, retrieval, transport and processing operations for both the tank farms and the WTP and thereby identify gaps in understanding and data. Important waste parameters for these operations are identified by examining examples of relevant mathematical models of selected phenomena including: The data sets in (UDS composition and particle density, UDS primary particle size and shape, UDS particle size distributions [PSDs], and estimated particle size and density distributions [PSDDs]) and Poloski et al. (2007) ...

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“…Saltcake solids are typically on the order of several tens or hundreds of micrometers, while sludge particles are on the order of ten micrometers or smaller (Wells et al 2007). The shift to smaller particle size, d, alone will result in a peak with regards to yield stress as the parameter, c ∝ d -2 (Zhou et al 2001). Additionally, dilution will ultimately result in a reduction in solution ionic strength and zeta potential.…”

Section: Bingham Plastic Modelingmentioning

confidence: 99%

“…Additionally, dilution will ultimately result in a reduction in solution ionic strength and zeta potential. The parameter c will reach a maximum value when the zeta potential is zero (Zhou et al 2001). Consequently, in some cases, dilution with water will result in a rheological maximum due to these surface chemistry effects.…”

Section: Bingham Plastic Modelingmentioning

confidence: 99%

Estimate of Hanford Waste Rheology and Settling Behavior

Poloski¹,

Wells²,

Tingey³

et al. 2007

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The actual testing activities were performed and reported separately in referenced documentation. Because of this, many of the required topics below do not apply and are so noted. Test ObjectivesThis section is not applicable. No testing was performed for this investigation. Test ExceptionsThis section is not applicable. No test specification as well as test exception applies to this investigation as there was no testing was performed. Results and Performance Against Success CriteriaThis section is not applicable. No success criteria were established as there was no testing performed for this investigation. Quality RequirementsSince This report is based on data from testing as referenced. The PNNL assumes that the data from these references has been fully reviewed and documented in accordance with the analysts' QA Programs. PNNL only analyzed data from the referenced documentation. At PNNL, the performed calculations, the documentation and reporting of results and conclusions were performed in accordance with the RPP-WTP Quality Assurance Manual (RPP-WTP-QA-003, QAM). Internal verification and validation activities were addressed by conducting an independent technical review of the final data report in accordance with PNNL procedure QA-RPP-WTP-604. This review verifies that the reported results are traceable, that inferences and conclusions are soundly based, and that the reported work satisfies the Test Specification Success Criteria. This review procedure is part of PNNL's RPP-WTP Quality Assurance Manual). Test ConditionsThe scope of the RWG effort is specified in the approved WTP issue response plan (24590-WTP-PL-ENG-06-0013) and defined in subcontractor change notice (SCN) 007 and Test Specification 24590-PTF-TSP-RT-06-007, Rev 0.Demonstrate the simulant properties used for testing bracket expected actual waste properties. For non-cohesive solids (Phase 1) this includes particle size, solids density, solids concentration, liquid density, and liquid viscosity. For cohesive solids (Phase 2) this includes bulk slurry density, particle size, particle density, slurry rheology (such as consistency and yield stress) and shear strength of settled, aged sediments, as well as settled layer (heel) thickness.Waste received at the WTP will be subject to a feed specification supporting plant design and as agreed to in an Interface Control Document. This report compiles the existing Hanford Tank Farm rheological data addressed in italicized text above and establishes expected ranges for these properties for as-retrieved Hanford Tank Farm wastes. Various processes will be performed on these retrieved wastes which are expected to alter these property ranges from the as-retrieved conditions. Simulant development activities should focus on the expected properties of the waste streams under such processing conditions. v Simulant UseThis section is not applicable. No testing was performed for this investigation.

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Chemical and physical control of the rheology of concentrated metal oxide suspensions

Cited by 248 publications

References 131 publications

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

Hanford Waste Physical and Rheological Properties: Data and Gaps

Estimate of Hanford Waste Rheology and Settling Behavior

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