Production of magnetic refrigerant material by ferro-manganese mixture

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...

AI Technical Summary

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.

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