Production of magnetic refrigerant material by ferro-manganese mixture

A technology for magnetic refrigeration materials and iron-manganese nodules, which can be applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of low grade and no mining value, and achieve simple preparation process, widen possibilities and rich sources of raw materials. Effect

Inactive Publication Date: 2009-10-28
林勋
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Problems solved by technology

The iron-manganese nodule placers deposited in inland lacustrine facies in my country are widely distributed, and their mineral components mainly include iron, manganese, cobalt, nickel, etc., but most of them are waste ores because of their low grade and no mining value.

Method used

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  • Production of magnetic refrigerant material by ferro-manganese mixture
  • Production of magnetic refrigerant material by ferro-manganese mixture

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Embodiment Construction

[0012] Take 10 kilograms of iron-manganese nodule secondary ore or ocean polymetallic nodule secondary ore, add dilute nitric acid to dissolve it, control the PH value of 3-4, and then add 10 kilograms of gadolinium gallium garnet powder, homogenize, and wait for the pH to rise After reaching a slightly acidic pH of about 6.5, the excess tartaric acid aqueous solution is thoroughly mixed and dehydrated by a centrifugal dehydrator. The dehydrated material is heated in the air at 900-1000℃. For example, it can be heated, dried and cooled by a constant temperature blast furnace. Serve as a magnetic refrigeration material. During the above-mentioned whole reaction process, some non-magnetic gallium ions are replaced by magnetic iron ions, and because of the super exchange between Fe ions and Gd ions, the local magnetic moments are ordered to form magnetic nanocluster materials. The effective working temperature range of magnetic refrigeration materials is 15k-40k.

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Abstract

The invention discloses a method for preparing a magnetic refrigeration material from a mixture of iron and manganese nodules. Iron-manganese concretion placer is a secondary ore produced by long-term biological bacteria action, with a hidden nano-transition structure. The present invention uses nitric acid to double-decompose nano-scale secondary ore with iron-manganese structure and gadolinium-gallium garnet (Gd3Ga5O12) in equal proportions, then fully mixes with excess tartaric acid water-soluble wine, dehydrates, heats and cools with high-temperature air. That is, the magnetic refrigeration material that constitutes the magnetic nano-cluster substance. The invention develops and utilizes the ferromanganese nodule secondary ore with abundant reserves in my country, which not only enriches the source of raw materials for preparing magnetic refrigeration materials, but also broadens the possibility of applying the secondary ore to other nanotechnology fields; When the magnetic refrigeration material loses its refrigeration effect after repeated use, it can also be used as a fertilizer for trace elements in fly sand soil improvement and low-yield fields. The magnetic refrigeration material is a slag-free, pollution-free, energy-saving and environment-friendly material, and has a simple preparation process.

Description

Technical field: [0001] The invention relates to a magnetic refrigeration material technology, in particular to a method for preparing a magnetic refrigeration material from a mixture of iron and manganese nodules. Background technique: [0002] Magnetic refrigeration materials are high-tech materials and are still in the stage of continuous research and innovation in my country. Sichuan University has successfully developed the first domestic permanent magnet rotary room temperature magnetic refrigeration prototype. It uses neodymium iron boron permanent magnets and rare earth magnetic refrigeration materials, and the refrigerating medium rotates around the magnet to achieve the purpose of indoor cooling. Large refrigeration power and refrigeration temperature span are expected to be developed as the technical basis for refrigerators and air conditioners. Among them, the magnetic refrigeration material is also very important. Therefore, the raw materials for the preparation of m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/02
Inventor 林勋
Owner 林勋
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