Magnetic grates are used within the material flow. They are located either separately, or, at better, as a part of the complete case separator MSV. Magnetic grates are the crucial part of the case magnetic separators in loose materials. Magnetic output of the cores is set according to the submission and aim of a given separation task. To achieve an efficient separation, magnetic grates are used in two (or even more) floors located above each other, in order to provide a proper fall labyrint
Magnetic grate utilization – industrial areas
In the separation, magnetic grate(s) is/are used in all industrial areas where a dry material is separated in small or fine fractions, with good bulk parameters.
Areas of utilization:
- Food industry, feeding product industry
- Building matter industry, ceramics, porcelain production, chemical industry
- And other industrial areas where dry, loose / bulk materials are processed
Magnetic grates are not suitable for using with abrasive agents (pipe wall is machined to a small thickness of ca 0.6 mm = fast wearing out). The same applies to materials with adhesive characteristics (grates are stationary = there is a risk of separator clogging by the reason of so called “arching” of the material).
Areas of utilization in the industrial operations:
1. Separation used to protect technologies in operations:
Technology protection separation is aimed at ferromagnetic particle removal from a medium. The purpose consists in a protection of own technological devices against damaging (cutting knives, etc.). Magnetic grate(s) is / are located within the medium processing, before the technological units that need to be protected against damaging by Fe particles. To achieve the maximum output, magnetic cores of the grates are equipped with strong NdFeB magnets. Their composition or the core assembly is made to catch medium-size, small and fine impurities (up to the size of 1.0 mm) that could damage subsequent technological units. It means that, in practice, core compositions of the levels I or II are used.
2. Product cleanliness separation:
The aim of separation is cleaning of the own product from the ferromagnetic impurities, aimed at as good as possible product cleanliness. In this case, the grate (s) is/are situated especially on the end of the production process, or within its course, on more positions. From the output point of view, grate magnetic cores are equipped with the strongest NdFeB magnets, and the magnetic core composition is designed to catch fine to the smallest impurities (starting since 1,0 µm). In practice it means that core compositions on the levels III, IV, V or VI are used.
Main benefits of MG and MGD magnetic grates:
- Good separation level – using of the strongest NdFeB magnets and lowering of the magnetic force loss by an accurate core covering pipe to the thickness of 0,6 mm at max.
- Adjustable level of the core magnetic equipment on the levels I, II, III, IV, V or VI. – a proper separation task solution as a function of operational conditions and the separation target.
- User friendly cleaning system – the system of cores capable of being pulled out of the grates provides a possibility of a comfortable and good system of the grate cleaning from Fe impurities, enabling thus reduction of operator working time losses. However, from the working safety point of view we must be careful when handling the grates and cores in the pulled out state. Not careful handling means a danger of hand finger injury.
Magnetic grate design
Magnetic grates consist of the load-bearing frame, pipe cases and magnetic core. The load-bearing frame for pipes is made of a flat profile with the thickness of 40 mm.
The pipe or the magnetic core cases are made of pulled, seamless pipes, and they are engineered to a very low thickness (ca 0.6 mm), providing magnetic output losses as low as possible. The standard MAGSY grate pipe diameter is 31.0 mm.