How to convert some weak magnetic iron minerals such as hematite, limonite, siderite and pyrite into ferromagnetic minerals?    In the heating process, the limonite first removes the crystal water and turns into hematite which does not contain water, and then proceeds according to the above reaction.    Third, oxidative roasting 7FeS 2 +6O 2 → Fe 7 S 8 +6SO 2 ↓ 3Fe 7 S 8 +38O 2 → 7Fe 3 O 4 +24SO 2 ↓    This method is commonly used in the separation of the metal concentrate with pyrite roasting from rare metals.
Many home remodeling or building projects leave behind a surplus of discarded or extra materials.
If you work with electronics or are in an industry that requires you to remove insulation from wires frequently,
Copper Stripping Machine Copper Stripping Machine, Copper Cable Stripping Machine, Copper Wire Stripping Machine, Scrap Copper Stripping Machine TAIZHOU GUANGLONG WIRE STRIPPING MACHINE MANUFACTURING CO.,LTD , https://www.scrap-wire-stripper.com
Weak magnetic minerals can be converted into ferromagnetic minerals by roasting, which is customarily called magnetization roasting. However, due to the different types of calcined minerals, the chemical reactions occurring during calcination are also different, so the principle of calcination is also different. According to the roasting principle, it can be divided into reduction calcination, neutral calcination and oxidative roasting.
Second, neutral roasting
This kind of roasting is suitable for siderite. When roasting, it can be heated to 300~ without introducing air or introducing a small amount of air.
Oxidation roasting is suitable for pyrite. It is calcined in a short time in an oxidizing atmosphere (or a large amount of air) and is oxidized to pyrrhotite. The reaction is as follows:
The calcination time is extended and the pyrrhotite is converted into magnetite by the following reaction.
In many cases this material can be resold or simply thrown away,
but copper wire is valuable as scrap metal and can be recycled to provide a few extra dollars and to help the environment.
However, most copper wire is insulated with plastic sheeting and sometimes must be stripped before it can be taken to the local recycling center.
