Abstract: Magnetic separation technology plays a pivotal role in modern mineral processing, with equipment design directly impacting efficiency and sustainability. From dry to wet systems, weak to high-gradient magnetic fields, this guide explores the diverse types of magnetic separators available—each tailored to specific ore characteristics and industrial needs. Discover how advancements in permanent magnet materials and superconducting technology are driving cleaner, more energy-efficient solutions for the mining sector.
Introdução
Se o equipamento de separação magnética is reasonable, advanced, and efficient determines the overall effectiveness of the beneficiation process. Paying attention to research on magnetic separation equipment can further optimize the mine beneficiation process. Centralized crushing and centralized sorting may become the trend of the future mining industry. With the increasing scarcity of mineral resources and the continuous improvement of production requirements, the sorting requirements of energy and mining materials will continue to increase.
The particle size of magnetite inclusions is not uniform. To separate individual magnetite particles that meet process requirements, the minimum inclusion particle size must be used as the grinding standard. In the design of magnetic separation equipment, mechanical factors that facilitate material separation—such as air force, centrifugal force, gravity, electric field force, and water capacity—should be incorporated to achieve efficient separation.
Although magnetic separation equipment is a clean separation method, it inevitably consumes large amounts of electricity and water. As the mining industry places increasing emphasis on energy conservation and emissions reduction, the upgrading and retrofitting of magnetic separation equipment have become an important component of these efforts. Magnetic separation is a material separation and processing technology widely used across numerous industrial sectors. In the field of mineral processing, magnetic separation technology has made significant progress. Thanks to advancements in permanent magnet materials, improvements in their performance, and the gradual increase in the magnetic energy product of permanent magnets, magnetic separation equipment has also experienced rapid development. Magnetic separators come in a wide variety of configurations, and there are numerous classification methods.
- De acordo com a intensidade do campo magnético, divide-se em weak magnetic separator, medium magnetic separator, and strong magnetic separator;
- De acordo com o meio de separação, divide-se em o separador magnético seco e o separador magnético húmido;
- According to the magnetic source, it is divided into the permanent magnet magnetic separator and the electromagnetic magnetic separator.
What Types of Magnetic Separators Are There?
1. Separador magnético forte a seco
Dry strong magnetic separators have been used in industry for more than 50 years, mainly for the separation of coarse-grained minerals. With the development of rare earth permanent magnet materials, a permanent magnet roller magnetic separator with a higher magnetic force than a strong magnetic field electromagnetic separator has been manufactured. Although the magnetic induction intensity is not easy to adjust, it is possible to design a roller magnetic separator that can handle materials with different particle sizes and different specific magnetic susceptibility by selecting the permanent magnet material reasonably and optimizing the geometry of the roller. The weight and size of the permanent magnet roller magnetic separator are smaller than those of the electromagnetic induction roller magnetic separator, and there is no air gap, which can handle large particles, making the permanent magnet roller magnetic separator have a great technical and economic effect. First, magnets of different grades and sizes can be used to reduce costs; second, electromagnetic modeling software can be used to optimize magnet design. For the dry pre-selection of weak magnetic iron ore, in recent years, the dry-type strong magnetic separator has been used to replace the gravity separation equipment, so the pre-selection index has been significantly improved.
2. Dry Weak Magnetic Separator
O principal objetivo do separador magnético fraco seco é remover as limalhas de ferro e as impurezas ferromagnéticas ou enriquecer os componentes ferromagnéticos úteis. Os ímanes suspensos, as polias magnéticas, os ímanes de placa ou os ímanes de barra de grelha são geralmente utilizados para remover as limalhas de ferro e as impurezas ferromagnéticas, enquanto os tambores magnéticos são principalmente utilizados para enriquecer os componentes ferromagnéticos úteis. Atualmente, os separadores magnéticos fracos e secos são normalmente utilizados nas minas do meu país para pré-selecionar minerais magnéticos fortes. Antes da trituração grosseira, da trituração média, da trituração fina e da moagem, a utilização da separação magnética fraca a seco de minério em pedaços pode lançar mais de 80% dos resíduos de rocha misturados no minério, o que aumenta a capacidade de processamento da moagem, melhora o grau do minério para moagem e reduz o consumo de energia.
3. Wet Weak Magnetic Separator
The magnetic drum separator is the most commonly used wet-weak magnetic separator. With the emergence of NdFeB permanent magnet materials, the permanent magnet magnetic separator has almost completely replaced the electromagnetic drum magnetic separator. This magnetic separator is mainly used to recover the medium in heavy medium beneficiation, such as magnetite and ferrosilicon. The enrichment of strong magnetic minerals is another application of this magnetic separator. The use of rare earth permanent magnets and further improvements in their properties have expanded the wet-type magnetic separator to separate medium-magnetic and weakly-magnetic materials.
Os ímanes do separador de tambor magnético permanente estão disponíveis em dois modelos: configuração radial e configuração axial.
- Na configuração radial, a polaridade dos ímanes permanentes alterna ao longo da largura do tambor;
- In the axial configuration, the polarity of the permanent magnets alternates along the barrel’s circumference.
The radial configuration é geralmente utilizado para melhorar a taxa de recuperação de materiais ferromagnéticos. A alteração da polaridade dos ímanes dispostos axialmente faz com que as partículas seleccionadas caiam na superfície dos ímanes, libertando assim as partículas não magnéticas arrastadas do produto magnético, o que pode melhorar o grau do concentrado magnético.
A separador magnético de tambor húmido é o principal equipamento de seleção para minério de ferro magnético forte. Atualmente, foram feitos grandes progressos no método de alimentação de minério, conceção do sistema magnético, tipo de tanque, mecanismo de transmissão, grande escala, especialização e alta eficiência.
The selection equipment for strong magnetic iron ore includes low-field-strength multi-pole magnetic separators, magnetic aggregation machines, magnetic separation columns, vertical pulse vibration magnetic separators, low-field-strength pulsation magnetic separators, low-field-strength self-weight jumper Elimination machines, etc. Its typical feature is to use the combined action of a weak magnetic field and gravitational field to remove the magnetically mixed gangue and improve the iron grade of the concentrate. Moreover, the selection effect is good.
4. Wet Magnetic Separator and High Gradient Magnetic Separator
Introducing the medium into the magnetic circuit of the magnetic separator can make the magnetic separation method process the materials that were considered too fine and too weak to select other materials in the past. Jones studied this in 1960 and combined the Frantz concept of magnetized media with strong magnetic fields. A more advanced magnetic separator design according to the Jones concept is the SALA high-gradient magnetic separator. Although a variety of multi-cycle and continuous wet high-gradient magnetic separators have been designed and manufactured, only a few magnetic separators can meet the mining industry’s requirements. The purification of kaolin and the beneficiation of iron ore and placer are examples of successful applications of this magnetic separator.
O minério de ferro magnético fraco de grão fino deve ser separado por equipamento de separação magnética forte. Atualmente, os dois tipos SHP e SLON são amplamente utilizados nas instalações nacionais de transformação de minério de ferro. O representante típico deste tipo de equipamento é o separador magnético de alto gradiente pulsante de anel vertical, que é um equipamento de separação magnética de alta eficiência adequado para a triagem de minerais magnéticos fracos de grão fino.
The advantages of the vertical ring pulsating high gradient magnetic separator:
- Grande rácio de enriquecimento
- Elevada eficiência de seleção
- O meio magnético não é fácil de bloquear
- Forte adaptabilidade à flutuação do tamanho das partículas de alimentação, concentração e grau
- Trabalho fiável
- Fácil de operar e manter
Aplicação da tecnologia de supercondutores na separação magnética
Embora a aplicação da tecnologia de supercondutores ao equipamento do processo de separação magnética seja de grande significado, a sua importância na separação magnética não parece manifestar-se. Uma vez que a necessidade de indução magnética acima de 2T ainda não é evidente, as principais vantagens dos ímanes supercondutores são a redução do consumo de energia e do peso do separador magnético. Os ímanes supercondutores podem também ser aplicados numa configuração helicoidal de gradiente aberto sem utilizar um meio para gerar forças magnéticas fortes em grandes volumes. A remoção de ferro magnético fraco quase coloidal e de óxidos de titânio para purificar o caulino é o objetivo principal de um separador magnético de gradiente elevado supercondutor.
Nos últimos anos, a aplicação em larga escala de ímanes permanentes de terras raras acelerou consideravelmente o processo de magnetização permanente do equipamento de separação magnética. Devido à aplicação de alta tecnologia e ao desenvolvimento do controlo automático, a precisão de classificação do equipamento de separação magnética é cada vez maior. Principalmente na melhoria da precisão da triagem, na expansão dos campos de aplicação, no aumento da capacidade de processamento, na adoção de novos materiais magnéticos, na poupança de energia, na redução do consumo, etc. O equipamento em grande escala, especializado e economizador de energia é o foco da tendência de desenvolvimento futuro e da concorrência no mercado de equipamentos de separação magnética.
Magnetic Separators From JXSC
JXSC provides a comprehensive range of magnetic separation equipment designed for various mineral processing applications. Its product portfolio includes dry magnetic separators, wet drum magnetic separators, high-intensity magnetic separators, high-gradient magnetic separatorse electromagnetic separators, covering everything from rough separation and concentration to the recovery of weakly magnetic minerals.
Engineered with high-performance magnetic materials, optimized magnetic field distribution, and robust structural design, JXSC magnetic separators offer advantages such as stable separation performance, low energy consumption, easy maintenance, and long service life. These systems are widely used for processing iron ore, manganese ore, ilmenite, wolframite, cassiterite, rare earth minerals, quartz sand, feldspar, and the recycling of industrial materials.
Whether for small-scale operations or large industrial beneficiation plants, JXSC can provide customized magnetic separation solutions based on ore properties, processing requirements, and production capacity, helping customers improve recovery rates while reducing operating costs and environmental impact.
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