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Production of magnetic refrigerant material by ferro-manganese mixture

A technology of magnetic refrigeration materials and ferromanganese concretions, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of low grade and no mining value, and achieve simple preparation process, broaden possibilities, and rich sources of raw materials Effect

Inactive Publication Date: 2007-11-21
林勋
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 kg of iron-manganese nodule secondary ore or oceanic polymetallic nodule secondary ore, add dilute nitric acid to dissolve, control the pH value to 3-4, then add 10 kg of gadolinium gallium garnet powder, mix evenly, and wait for the pH value to increase After reaching a slightly acidic pH of about 6.5, then use excess tartaric acid aqueous solution to fully mix and dehydrate through a centrifugal dehydrator. The dehydrated material is heated in the air at 900-1000°C. After that, it becomes a magnetic refrigeration material. During the above-mentioned whole reaction process, some non-magnetic gallium ions are replaced by magnetic iron ions, and due to the super exchange between Fe ions and Gd ions, the local magnetic moment is ordered to form a magnetic nano-cluster material. The effective working temperature range of the magnetic refrigeration material is 15k-40k.

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Abstract

Production of magnetic refrigerating material by ferro-manganese mixture is carried out by taking nano-secondary mineral with nitrate replacement ferro-manganese structure and mixture of Gd3Ga5012, mixing with excess tartaric acid solution, dewatering, heating by high-temperature air and cooling to obtain final product. It's simple, has various raw material sources and no environmental pollution. It can be used as low-yield filed microelement fertilizer and for modifying sand soil.

Description

Technical field: [0001] The invention relates to the magnetic refrigeration material technology, in particular to a method for preparing the magnetic refrigeration material from a mixture of iron and manganese nodules. Background technique: [0002] Magnetic refrigeration materials are high-tech materials, which are still in the stage of continuous research and innovation in our country. Sichuan University successfully developed the first permanent magnet rotary room temperature magnetic refrigeration prototype in China. It uses NdFeB permanent magnets and rare earth magnetic refrigeration materials, and the refrigerant rotates around the magnets to achieve the purpose of indoor refrigeration. Large cooling power and cooling 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 critical. Therefore, the raw materials for preparing magnetic refrigeration materi...

Claims

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Application Information

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IPC IPC(8): C09K5/02
Inventor 林勋
Owner 林勋
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