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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

Mine Power Coal Cement Others
Materials ρ(t/m3) Materials ρ(t/m3) Materials ρ(t/m3) Materials ρ(t/m3) Materials ρ(t/m3)
ore sand 2.5~4 ash 2~2.2 magnetite
powder
4.8~5.0 limestone 2.64 silica sand 2.7
tailings 2.7~3.2 Slag 2.2~2.4 coal slime clay 1.35~2.0 river sand 2.36
ore concentrate / liquid slag 2.4~2.7 / / / / / /

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 number Millimeter Mesh number Millimeter Mesh number Millimeter
8 2.5~3.15 30 0.5~0.63 120 0.1~0.125
10 2.0~2.5 36 0.4~0.5 150 0.08~0.1
12 1.6~2.0 46 0.35~0.4 180 0.063~0.08
14 1.25~1.6 60 0.25~0.315 240 0.05~0.063
16 1.0~1.25 70 0.2~0.25 280 0.04~0.05
20 0.8~1.0 80 0.16~0.2 / /
24 0.63~0.8 100 0.125~0.16 / /

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

Mesh number Millimeter Mesh number Millimeter Mesh number Millimeter
5 4 20 0.841 100 0.149
6 3.36 25 0.707 120 0.125
7 2.83 30 0.595 140 0.105
8 2.38 35 0.5 170 0.088
10 2 40 0.42 200 0.074
12 1.68 45 0.352 230 0.063
14 1.41 50 0.297 270 0.053
16 1.19 60 0.21 325 0.044
18 1 80 0.177 400 0.037

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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