With the rapid development of domestic waste incineration power generation industry, incineration of bottom ash residue resource treatment has become an important part of the environmental protection industry. Incineration bottom ash sorting as the core technology, is playing an increasingly important role.

First, the definition and significance of incineration bottom ash sorting

Incineration bottom ash sorting refers to a series of physical methods, the bottom ash produced after the incineration of domestic waste fine treatment, from which the recovery of iron, copper, aluminum, stainless steel and other valuable metals, and the remaining tailings into building materials for the complete process of raw materials.

Core value:

• Resource regeneration: to realize the recycling of metal resources

• Environmental Protection: Reduce landfill area and avoid secondary pollution.

• Economic Benefits: Creating continuous and stable income from metal sales.

• Circular economy: help realize the goal of "waste-free city" construction.

Second, incineration bottom ash sorting complete process flow

1. Pre-treatment stage

• Uniform feeding → Grid sieve removing impurities → Tumbler sieve grading

• Purpose: to remove large debris, to achieve uniform distribution of materials

2. Crushing and shaping

• Using special crusher for coarse crushing + fine crushing

• Key: Crush the incineration bottom ash to the appropriate particle size to promote metal dissociation.

3. Metal sorting core link

• Magnetic separation: permanent magnetic separator to recover ferrous metals.

• Eddy current separation: efficient extraction of non-ferrous metals such as copper, aluminum, etc.

• Gravity separation: jigger + shaker for fine recovery of precious metals

• Stainless steel sorting: special equipment to ensure the recovery rate of stainless steel.

4. Post-treatment system

• Fine screening → spiral sand washing → filter press dewatering

• Slag-water separation, realizing the recycling of water resources

5. Finished product processing

• Metal products: packaged and sold according to categories

• Tailings utilization: meet the standard of building materials, used for making bricks, roadbed materials, etc.

Third, the core technology and equipment support

The complete incineration bottom ash slag sorting system contains:

• Feeding system: plate feeder, vibrating feeder

• Crushing system: slag special crusher

• Screening system: tumbler screen, vibrating screen, dewatering screen

• Separation system: magnetic separator, eddy current separator, jigger, shaking table

• Conveying system: belt conveyor, screw conveyor

• Environmental protection system: sedimentation tank, filter press, circulating water device

Fourth, the comprehensive value of incineration bottom ash sorting

Economic benefits

• Short payback period: usually 10-18 months

• Stable metal returns: continuous output of iron, copper, aluminum, stainless steel and precious metals

• Low operating costs: high degree of automation, low manpower requirements

Environmental benefits

• Resource utilization rate of 100%, realizing "zero landfill" for solid waste.

• Full physical sorting, no chemical additives, no secondary pollution

• Resource utilization of tailings, reducing natural resource exploitation

Social Benefits

• Help garbage power generation enterprises realize circular economy

• Provide high-quality building materials for urban construction

• Promote the construction process of "waste-free city".

V. Successful application cases

This technology has been successfully applied in many projects in China:

• 1000 tons/day project of a state-owned enterprise in Jiangsu

• 1200 tons/day project of a listed company

• 1000 tons/day project of a large enterprise in Vietnam
  These projects have realized good economic and environmental benefits.

Incineration bottom ash sorting is not only a technical process, but also an important practice of circular economy development. Through the refined sorting treatment, the incineration bottom ash originally regarded as waste has become a "city mine", which really realizes the goal of "letting every ton of incineration bottom ash, all produce value".

With the continuous improvement of environmental protection requirements and the enhancement of resource regeneration awareness, incineration bottom ash sorting technology will contribute more to the construction of a beautiful earth and realize sustainable development.