The main criticisms of the washing technology are essentially as below:
- Requires significant quantity of water which is not always available at the location or area.
- Produces sludge from the rejects of the crusher dust and this needs to be handled and disposed off as there is no value for this item. Moreover, it is an environmental hazard.
- Large land requirement for sludge disposal.
CDE has very effectively sorted out the first problem of water management by offering a highly efficient online wastewater treatment function within their Combo range of sand washing plants through which 90% of the water is recovered and recirculated for reuse. In addition to this, CDE Combo range is equipped with the unique EasySettle technology to further add to the recovery of water from the sludge discharged during wastewater treatment so that totally +95% of the water is recovered and recycled, the balance being lost as evaporation or moisture in the product. This has reduced the water requirement to such a level that the washing plants have become cost-effective and sustainable even in areas reporting severe water shortages. This technology not only increased water recovery but enabled the operators to operate the washing plants in a small land area.
A solution has been found by CDE in collaboration with a German company and it has been established that the sludge can be consolidated in any desired shape through the use of a binding agent. The chemical is to be mixed with the dry sludge in suitable proportions, which may vary from rock to rock type, and cast into mould of desired shape. The mould could be made of any material such as plastic or steel.
With this innovative application the customers can now utilise the entire feed material and there is no wastage for disposal. Also the water requirement is bare minimum as a result of +95% recycling. This has changed the economics of washing plant operation completely.
The legacy of CDE is value recovery from wastes through use of environment-friendly technologies and the company is continually innovating to develop sustainable wet processing techniques that will mitigate the risks of pollution and its adverse impact to the environment. To use every bit of waste but yet waste nothing.