Calculation of the washing process

The process shown in the figure below is a leaching, four-stage countercurrent wash. Are located W1, W2, W3, W4 of the washer liquid containing four gold (g / m ^3). In the process, the concentration of the leaching operation is 33.33% , the discharge concentration of the washing thickener is 50% , and after dilution to 20%, it is fed to the next-stage washing thickener. The new water added to the process does not contain gold. The figure in the figure is the amount of liquid ( ^m3 ) for processing 1 ton of ore .

1. Find the washing efficiency of each level

According to known conditions, L = 2 , R = 1 , K = 0 , F = 4 . The second, third, fourth and fifth countercurrent washing efficiencies are:

2. If the cyanide ore contains gold 52 grams / ton, the gold leaching rate is 96.15% , seeking the precious liquid and liquid gold grade in the countercurrent washing process at all levels.

Take a three-stage countercurrent washing operation as an example:

Entered gold that has been washed: 52 Ã— 96.15% = 50 ( g / ton )

Loss of dissolved gold in drain: 5 0 Ã— ( 1-E ₃ ) =0.945 ( g / ton )

By countercurrent washing tailings discharge concentration of 50%, the discharge of liquid gold 0.945% g / m ^3.

Handling 1 ton of raw ore output 4 meters ³ , including gold:

Â Â Â Â Â 50-0.945 = 49.055 (g / ^m3)

Therefore, the gold content of your liquid is:

Â Â 49.055 Ã· 4 = 12.264 (g / ^m3)

The same can be used to find the gold grade and the amount of gold in the precious liquids and drains:

Washing series Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â two Â Â Â Â Â Â Â Â Â Â Â Â Â three Â Â Â Â Â Â Â Â Â Â Â Â Â four

Gold grade of precious liquid (g / m ³ ) Â Â Â Â Â Â Â Â 11.765 Â Â Â Â Â Â Â Â Â Â 12.264 Â Â Â Â Â Â Â Â Â 12.423

Discharge gold grade (g / m ³ ) Â Â Â Â Â Â Â Â Â 2.94 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.945 Â Â Â Â Â Â Â Â Â Â 0.31

Gold content of precious liquid (g) Â Â Â Â Â Â Â Â Â Â Â Â 47.06 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 49.055 Â Â Â Â Â Â Â Â Â 49.69

Drainage gold content (g) Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2.94 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.945 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.31

3. Cyanide ore containing gold 6.5 grams / ton, solution gold in the leaching tank 6 grams / ton, the washing thickener no longer dissolves gold, the poor liquid contains gold 0.02 g / m ³ , seeking to wash the thickener liquid gold grade.

According to the balance of liquid gold content entering each thickener, the following relationships can be listed:

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Enter liquid gold Â Discharge liquid containing gold

First-stage washing thickener Â Â 2 Ã— 3+4w ₂ Â Â Â = ( 5+1 ) w ₁

Secondary washing thickener Â Â w ₁ +4 w ₃ Â Â Â Â Â = ( 4+1 ) w ₂

Three-stage washing thickener Â Â w ₂ +4 w ₃ Â Â Â Â Â = ( 4+1 ) w ₃

Four-stage washing thickener Â Â w _{3 Â} + 4 Ã— 0.02 Â = ( 4+1 ) w ₄

Solve the above equation:

Â Â w ₁ = 1.31435 grams / M ³

Â Â w ₂ = 0.47129 g / M ³

Â Â w ₃ = 0.12745 grams / M ³

Â Â w ₄ = 0.04149 grams / M ³

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