Production method for preparing nitriding ferrovanadium from high-vanadium magnets

Abstract

The invention discloses a production method for preparing nitriding ferrovanadium from high-vanadium magnets. The production method specifically comprises the following steps of (1) grinding: crushing high-vanadium magnet particles or blocks by utilizing a grinding machine, wherein the granularity of chippings after crushing is between 0.5 mm and 10 mm; (2) screening: screening the chippings which are crushed in the step (1) by utilizing a multistage screening machine, and sending the high-vanadium magnet chippings of which the granularity is greater than 5 mm to the grinding machine again so as to be ground; (3) neutrally leaching: immersing the high-vanadium magnet chippings of which the granularity is less than 5 mm in dilute sulphuric acid, wherein the solid-to-liquid ratio is (9 to 10):1, the leaching time is 1 h to 1.5 h, the temperature is 60 DEG C to 70 DEG C, and a pH value of final acid is 5.2 to 5.4; and (4) leaching in hot acid: immersing the chippings without dissolution reaction in the step (3) in dilute sulphuric acid. The production method has the beneficial effects that through neutral leaching and leaching in hot acid, the yield of ferrovanadium is increased, and an oxidation film is not generated in a nitriding process, so that the production efficiency and quality of the nitriding ferrovanadium are increased.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal production, in particular to a production method for preparing vanadium-iron nitride alloy from a high-vanadium magnet. Background technique [0002] Ferrovanadium nitride is a new type of alloy additive. Its performance is superior to that of ferrovanadium and vanadium nitride. It can be widely used in high-strength spiral steel bars, high-strength pipeline steel, high-strength section steel (H-beam, I-beam, channel steel, etc.) , angle steel), thin slab continuous casting and rolling high-strength steel strip, non-quenched and tempered steel, high-speed tool steel and other products. Especially in high-strength low-alloy steel, ferrovanadium nitride can effectively strengthen and refine grains compared with vanadium nitride and ferrovanadium, save vanadium-containing raw materials, thereby reducing steelmaking production costs. [0003] In the production process of ferrovanadium nitri...

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Problems solved by technology

[0003] In the production process of ferrovanadium nitride in the prior art, coarse metal particles directly enter the leaching process. Due to the large size of the particles, the metal elements wrapped inside the particles cannot be dissolved; resulting in incomplete destruction of metal ions, resulting in a large amount of iron-containing residues that are directly discarded , causing waste of raw materials, and the metal ions in the waste slag exceed the standard, which increases the cost of post-purification treatment; and after the ferrovanadium alloy is in contact with the air during the nitriding process, the moisture in the oxygen and moisture makes the surface form a dense oxide film , not only affects the nitriding speed, but also greatly reduces the nitriding effect, which affects the production efficiency of vanadium-iron alloy