Ore washining and water treatment

In mineralprocessing, Washing, mainly used in the enrichment process of industrial minerals, coal,aggregates, sand and gravel, normally with the products in solid form. (size = 1 mm and coarser).
Log washers
Single or double shaft log washers are used for washing of gravel. Contaminated material is fed at the trough bottom and is transported upwards by blades in abscrew pattern due to friction between the material. Effluent in slurry form leaves via an overflow weir.
Wet screens
Water spraying can be used to wash materials on a screen regardless of hole size in the screening media. If the hole size is 20 mm or less, water spraying increases the capacity (inversely proportional to the hole size).
Aquamator separator
The Aquamator is developed for efficient washing of waste material of lower densities like coal, wood etc. Used mainly for gravel, chippings and demolition rubble. The water and feed form a bed with a density high enough ( SG range1.2-1.6) enabling light material to float off.
Typical feed size is plus 2 mm up to 32 mm. (9 mesh – 1.3”)
Tumbling scrubber
If solids of rock, gravel or minerals contain a high and sticky content of clay and dirt that has to be removed, wet screening is normally not effective enough. A medium speed washing drum for scrubbing solids against solids is then the option. The drum is relatively short in relation to its diameter. Water requirements per ton is the same as for wet screening.
Attrition scrubber
These scrubbers are mainly used for washing of material below 10 mm in size. Very high energy inputs are possibly used for washing of silica sand for glass making and cleaning of foundry sand. The machine is also suitable for clay blunging and lime slacking,


Wash Water Treatment
All washing operations are normally consuming a lot of expensive water. Not only costly, but also containing a lot of washing effluents both coarse and fine. Water and effluents that have to be processed partly to recover some value (coarse material and water), partly to protect the environment from damage (sludge fractions). Most washing operations today must have systems for this treatment.
Wash water treatment stages
Depending on local conditions and restrictions, one, two or three treatment stages may be required, see below.
Wash water treatment – closed system
After recovery of coarser material the fines can be treated in a closed system recovering all process water and bringing the fine solids into a transportable form.
For more information, please contact sinonine

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