Measurement of Viscosity of Simulated High-level Radioactive Waste Glass Containing Platinum Group Metal Particles by Rotating Viscometer Method (CAT#: STEM-PPA-0036-YJL)

Introduction

High-level radioactive waste (HLW) generated from reprocessing of spent nuclear fuel is commonly mixed with glass materials and heated in a glass melter to be vitrified. Viscosity information of the molten HLW glass is important for designing and operating the melter. The viscous property of the HLW glass is affected by fission origin platinum group metals (PGMs), more specifically Ru, Rh and Pd. These elements are poorly soluble in the glass and normally dispersed in the glass as spherical or needle-shaped particles. However, these particles have a potential to settle down on the melter bottom and make a glass-PGMs composite sludge. During the draining of the glass from the melter, the sludge may stay on the melter wall, or even removed from the wall, it might clog the drain-nozzle. Thus the viscosity information of glass containing higher amounts of PGMs than the standard composition (∼1 wt% for total PGMs) is required.

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Principle Applications Procedure Materials Notes Related Products

Principle

The principle of the rotating viscometer method to measure the force acting on a rotor (torque) when it rotates at a constant angular velocity (rotational speed) in a liquid. Rotating viscometers are used for measuring the viscosity of Newtonian (shear-independent viscosity) or non-Newtonian liquids (shear dependent viscosity or apparent viscosity). Rotating viscometers can be divided in 2 groups, namely absolute and relative viscometers. In absolute viscometers the flow in the measuring geometry is well defined.
The measurements result in absolute viscosity values, which can be compared with any other absolute values. In relative viscometers the flow in the measuring geometry is not defined. The measurements result in relative viscosity values, which cannot be compared with absolute values or other relative values if not determined by the same relative viscometer method. Different measuring systems are available for given viscosity ranges as well as several rotational speeds.

Applications

Mineral oil industry; Food industry; Cosmetic/pharmaceutical industry; Petroleum industry; Chemical industry

Procedure

1. Pour the liquid into the measuring cup.
2. Insert the spindle into the liquid.
3. Rotate the spindle and measure the resistance.

Materials

• Sample Type: liquid, gel-like, or semi-solid everyday substances

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