Tell you some common knowledge about scrap steel recycling

1. Cutting

Shear treatment is mainly used for cold cutting of steel sections, shafts, and various large metal structural components with a length exceeding a certain size.

2. Pressing block

Also known as packaging. Mainly targeted at loose volume pipes, containers, lightweight materials, granular materials, powder materials, etc. The first purpose is to reduce volume, facilitate loading and unloading, and transportation; The second is to produce high-density blocks, which are convenient for steelmaking processes.

3. Broken

Crush large pieces of scrap steel and related accessories into small pieces or particles to facilitate waste sorting. There are two types of crushing methods: mechanical crushing and physical crushing. Mechanical crushing is a commonly used crushing method in China today, which uses various crushers to break the material. The main crushing machinery includes crocodile crushers, roller crushers, impact crushers, and shear crushers. Physical crushing methods include low-temperature freezing crushing, ultrasonic crushing, etc.

4. Magnetic separation

Magnetic separation is a treatment method that utilizes the magnetic differences of various substances in solid waste to separate them in non-uniform magnetic sound. Magnetic separation is an effective method for separating iron-based metals. After inputting solid waste into the magnetic separator, the magnetic particles are magnetized under the action of uneven magnetic sound, thus being attracted by the magnetic field, causing the magnetic particles to be sucked into the cylinder and discharged along with the discharge end of the cylinder; Non magnetic particles remain in the waste due to the small magnetic field force they are subjected to. The magnetic field sources used in magnetic separation are generally either electromagnets or permanent magnets.

5. Cleaning

Cleaning is the use of various chemical solvents or hot surfactants to remove oil, rust, mud, and other debris from the surface of steel components. Commonly used to handle engines, bearings, gears, etc. that are contaminated with cutting oil, grease, oil stains, or other attachments in large quantities.

6. Preheating

Scrap steel often contains pollutants such as oil and grease, and grease and oil that cannot evaporate immediately can contaminate the molten metal. After outdoor storage of scrap steel is damp, the mixed moisture and other lubricating grease and oil can contaminate the molten metal. After being exposed to moisture, the waste steel stored in the open air will quickly expand in the furnace due to the presence of moisture and other easily vaporizing materials such as lubricating grease, and it is not suitable to add it to the steelmaking furnace. For this reason, many steel mills adopt the method of preheating scrap steel, using flames to directly bake scrap steel, burning off moisture and grease, and then putting it into the steel furnace.