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The DM3 density meter (also known as the DM3 or SCIAM DM3 density meter) is a newly developed system for density measurement.A part of a continuous, in-line measurement device that is used in major slurry industries and applications to accurately and safely calculate density.
A slurry composed of glass beads in silicone oil flowing down an inclined plane Potato starch slurry. A slurry is a mixture of denser solids suspended in liquid, usually water. The most common use of slurry is as a means of transporting solids or separating minerals, the liquid being a carrier that is pumped on a device such as a centrifugal pump.
This slurry is further mixed with a synthetic aerated foam in a concrete mixing plant. [9] The foam is created using a foaming agent , mixed with water and air from a generator. The foaming agent must be able to produce air bubbles with a high level of stability, resistant to the physical and chemical processes of mixing, placing, and hardening.
Typical spiral concentrators will use a slurry from about 20%-40% solids by weight, with a particle size somewhere between 0.75—1.5mm (17-340 mesh), though somewhat larger particle sizes are sometimes used. The spiral separator is less efficient at the particle sizes of 0.1—0.074mm however.
The cup is used to hold a fixed amount of fluid so it can be weighed. A slider-weight can be moved along the beam, and a bubble indicates when the beam is level. Density is read at the point where the slider-weight sits on the beam at level. Calibration is done using a liquid of known density (often fresh water) by adjusting the counter weight.
Bentonite in concentrations of 2–4% is also added to prevent segregation of particles and slurry. Gilsonite – Used to obtain slurry weights as low as 12.0ppg. In high concentrations, mixing is a problem. Powdered coal – Can be used to obtain a slurry with a density as low as 11.9ppg, 12.5–25 lbs per sack are usually added.
ρ = density in g/cm 3 t = quart funnel time in seconds For example, a mud of funnel time 40 seconds and density 1.1 g/cm 3 has an effective viscosity of about 16.5 cP. For the range of times of typical muds above, the shear rate in the Marsh funnel is about 2000 s −1. [4]
Such ponds are susceptible to disastrous releases, such as the Buffalo Creek flood of 1972 or the Martin County coal slurry spill of 2000, which released over 250 million gallons of coal slurry. [10] Coal slurry can contain hazardous chemicals such as arsenic and mercury and can kill aquatic wildlife, as was the case in the Martin County spill ...