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What is the Max Slurry Concentration of Centrifugal Slurry Pump?

Published on 2020/03/03

1. Common solid materials and density

Table 1 Common solid materials and density

MinePowerCoalCementOthers
Materialsρ(t/m3)Materialsρ(t/m3)Materialsρ(t/m3)Materialsρ(t/m3)Materialsρ(t/m3)
ore sand2.5~4ash2~2.2magnetite
powder
4.8~5.0limestone2.64silica sand2.7
tailings2.7~3.2Slag2.2~2.4coal slimeclay1.35~2.0river sand2.36
ore concentrate/liquid slag2.4~2.7//////

2. Median particle size of solid materials

Median particle size is the particle size when the cumulative weight is 50% during sample screening (particle size grading), that is, the weight of particles larger than this particle size is equal to the weight of smaller particles, and this particle size is the median particle size, expressed by “d50”, in mm or μm.

3. Comparison table of solid particle size and sieve mesh

Table 2 Comparison table of Chinese standard mesh and millimeter size

Mesh numberMillimeterMesh numberMillimeterMesh numberMillimeter
82.5~3.15300.5~0.631200.1~0.125
102.0~2.5360.4~0.51500.08~0.1
121.6~2.0460.35~0.41800.063~0.08
141.25~1.6600.25~0.3152400.05~0.063
161.0~1.25700.2~0.252800.04~0.05
200.8~1.0800.16~0.2//
240.63~0.81000.125~0.16//

Table 3 comparison table of American standard (US) mesh and millimeter size

Mesh numberMillimeterMesh numberMillimeterMesh numberMillimeter
54200.8411000.149
63.36250.7071200.125
72.83300.5951400.105
82.38350.51700.088
102400.422000.074
121.68450.3522300.063
141.41500.2972700.053
161.19600.213250.044
181800.1774000.037

4. Slurry Concentration, Density and Viscosity

① Definition of volume consistency
The ratio of the volume flow rate Qs of solids in the slurry to the volume flow rate Qw of the carrier (usually water) is called the volume consistency and is expressed in Ct.
Ct = Qs × Qw%

② Definition of weight consistency
The ratio of the weight flow rate of the solids in the slurry to the weight flow rate of the carrier is called the weight consistency and is expressed by Cz.
Cz = S · QS / SW · QW × 100%
In the formula: S, SW means solid matter, carrier density t / m3

③ Definition of volume concentration
The ratio of the solid object flow rate QS to the slurry volume flow rate Qm in the slurry is called the volume concentration and is expressed in CV.
CV = QS / Qm × 100%

④ Definition of weight concentration
The ratio of the weight flow rate of solids in the slurry to the weight flow rate of the slurry is called the weight concentration, which is expressed by CW.
CW = S · QS / Sm · Qm × 100%

In the formula, Sm refers to the slurry density, which can be calculated by the following formula:
Sm = SW + CV / 100 × (S-SW) t / m3

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