Incineration Bottom Ash

EJET MAGNET®-Your trusted IBA recycling equipment manufacture

We recommend using wet process incinerator bottom ash

In EJET MAGNET® slag separation plant design, we could help you effective separation of slag and high-quality recycled aggregate production. In particular, for different process layouts, we always have a reasonable wet separation process and the right equipment selection for you to choose from.

Comparing wet and dry incinerator bottom ash, the wet sorting solution could increase your overall metal recovery and speed up the entire process. It has the advantage of being dust-free, higher recycling efficiency, and better recovery. Importantly, the dry processing IBA is unable to effectively treat a fine size fraction of less than 2 mm. Most of all, as 20-30% of the ash fraction is smaller than 2 mm, any fine precious, along with copper, zinc, and lead, the dry sorting process is not recovered,

Metal recovery from slag is an important pre-treatment step for IBA reuse

At present, in China, the method used to recover IBA metal is the wet sorting process. That mainly includes screening, magnetic separation, eddy current separation, hydraulic precipitation, and so on.

EJET MAGNET® is very familiar with Recycling and separation systems for the IBA recycling industry. We have supplied more than 50 wet processing systems for waste-to-energy (W2E) facilities to recover metals. Therefore, we have lots of successful experience to help customers recycle Iron, Aluminum, Copper Sand, Gold, Silver, Stainless Steel, Glass, and Bottom Ash.

In the first place, use EJET trommel to enter the screening, then output different particle sizes of slag. After that, non-ferrous metal recovery by EJET eddy current separator. Among them, EJET concentric ECS is used for large materials, and small materials (fines of 0-4 mm) with EJET eccentric ECS. On the other hand, EJET permanent overhand magnet, wet drum magnet, and magnetic drum would recover ferrous metal. Screening or hydraulic precipitation, grading 3 ~ 8mm particles, the yard dried for later use.  Finally, the remaining residue is dried up and transported to a landfill for disposal.

In short, for technical assistance, expert advice, and more information on the IBA processing recycling system, please do not hesitate to contact us.

IBA sorting in a waste incineration plant

The original method is landfill, but landfill has the problem of taking up land resources, and also need to pay for landfill disposal. Compare with the incineration method,  landfill still has the risk of environmental pollution.

During the incineration of domestic waste, incineration plants produce about 0.23 tons of slag each ton of domestic waste incineration. After MSW incineration power plant, the slag belonged to solid waste. Its particle size was mainly distributed below 10 mm, which was mainly fine particles.

IBA main composition includes slag, glass, ceramics and bricks, stones, and other things, but also contains plastic, metal substances (ferrous metals, non-ferrous metals, etc.), and incomplete combustion of paper, fiber, wood, and other organic matter. For this reason, before comprehensive utilization of IBA, it must be effectively separated.

Turns waste into treasure

As mentioned earlier, pre-treatment of IBA can effectively separate and collect ferrous, non-ferrous, precious metals, and heavy metals. They are can be sold to metal recyclers. And due to the optimization unburned residual waste can use for the sand and gravel aggregate build materials industry. So mainly used for pavement materials, cement or concrete replacement materials, landfill cover materials, etc.

The conclusion can be drawn that, taking a slag plant with a capacity of 500 t/d as an example. The net profit of slag is 28.94 RMB per ton, the annual net profit is 4.782 million RMB per year. In a nutshell, by comprehensive utilization, the IBA turns waste into treasure.

Up to the Aggregate standard: metal recovery from IBA is very essential

On the other hand, incinerated bottom ash contains a large amount of iron, non-ferrous metals (mainly copper and aluminum), and unincinerated residual waste,  that will affect the life and performance of aggregate materials. Most importantly, metals can cause building materials to expand or crack during use, particularly aluminum.

Therefore, the recovery of metal from incineration bottom ash can not only improve the quality of slag recycling products but also realize the recovery of valuable metals such as iron, copper, and zinc.

IBA processing: both wet sorting and dry sorting

Wet sorting process

Generally speaking, using the “screening + crushing + magnetic separation + jigging + shaking + eddy current sorting + slag water precipitation, press filter” combined processing process, water washing sorting equipment for the slag sorting.

As shown in the graph below, mainly includes pretreatment system, crushing system, magnetic separation system, jigging sorting system, shaking table sorting system, and eddy current separation system. Different from the dry sorting process needs a sewage treatment system.

Dry sorting process

The process combination of “screening + crushing + wind + magnetic separation + eddy current sorting”. That is to say, sorts out the iron and non-ferrous metals from the slag, and afterward removes the light floating materials from the slag, eventually obtaining recycled aggregates of different particle sizes.

Incinerator bottom ash (IBA) Slag Wet Sorting Processing