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Recycling non-ferrous scrap
Apr 06, 2018

Recycling non-ferrous scrap

Non-ferrous metals

First, the characteristics of renewable non-ferrous metal scrap

1, the appearance of different shapes, very different.

(1) Plate and block waste

(2) Chips, Strips, Filaments

(3) Fine-grained waste such as powder and slag

2, high metal content, component fluctuations.

3, the surface is not clean, often with grease, dust and so on.

Second, pretreatment of recycled non-ferrous metal raw materials

The pretreatment of used raw materials mainly includes the following steps:

Classification, disassembly, tying, packing, briquetting, crushing, deoiling, sorting, etc.

1, classification

The purpose of the classification is to separate the raw materials into a single type of metal or alloy and remove the ferrous metal and non-metallic materials; carry out explosion-proof processing to remove explosive articles and materials.

The principle of classification is to stack each type of recycled non-ferrous metal raw materials.

The location of the classification is best set up in the place where the waste material is produced or the special manufacturer.

Classification methods: Mainly performed by hand, classified by appearance signs, classified by chemical analysis methods or instrument detection methods.

2. Dismantling, strapping, and packing of waste parts

The dismantling is the disassembly operation of the waste component assembly to separate the components of different types of materials, and to make the scrap pieces meet the requirements of the subsequent work.

Disintegration methods include: disassembly and destruction.

The disassembly method is suitable for the recovery of valuable parts or products such as ball bearings, knives, etc.

The destruction method is applicable to the disintegration of general wastes, and usually uses various methods such as cutting, cutting, crushing, and fine grinding.

For lighter and looser waste, it needs to be packed and bundled to compact it so that the waste has a certain weight, density, and blockiness, which facilitates transportation and processing.

3. Sorting

The purpose of sorting is to separate materials that are doped in waste, such as iron filings, household waste, industrial slag, and the like. The main methods of sorting include magnetic separation, flotation, and re-election.

Sorting operations can increase the recovery rate of wastes and reduce the cost of raw materials.

(1) Electromagnetic separation

Remove ferromagnetic objects from the waste, commonly used electromagnetic electromagnetic separator.

(2) Heavy Media Sorting

From the waste, the metals or alloys with different densities are selected.

Example: A suspension with a density of 6.8 Kg/m3 is made of magnetite and water, and the aluminum and aluminum alloy wastes are sorted by a heavy-medium separator. The denser components such as lead sink into the lower part, and the density The small aluminum component floated up the upper part.

(3) Flotation sorting

Metal waste (water or organic flotation agent as a flotation medium) is sorted from waste materials such as waste slag and soot.