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CN-121992241-A - Preparation method of high-nitrogen vanadium-nitrogen alloy and high-nitrogen vanadium-nitrogen alloy

CN121992241ACN 121992241 ACN121992241 ACN 121992241ACN-121992241-A

Abstract

The invention relates to the technical field of metallurgy, in particular to a preparation method of a high-nitrogen vanadium-nitrogen alloy and the high-nitrogen vanadium-nitrogen alloy, the preparation method comprises the following steps of 1, mixing and stirring wet-base industrial grade ammonium vanadate, graphite carbon powder reducer, metal iron powder catalyst and water-based binder according to a mass ratio of 100 (18-22) (0.2-0.5) (8-20) to obtain a mixture; and step 2, pressing and forming the mixed material to obtain a preformed material, and step 3, sequentially carrying out low-temperature presintering dehydration treatment, high-temperature nitriding reduction treatment and cooling annealing treatment on the preformed material to obtain the high-nitrogen vanadium-nitrogen alloy. The preparation method directly adopts industrial wet ammonium vanadate as a raw material, does not need pretreatment, and further reduces the production cost.

Inventors

  • YANG WENXIU
  • NI WEI
  • WANG YONGGANG
  • WANG GUAINING
  • LIU SHIYI
  • Man Jiating

Assignees

  • 攀钢集团钒钛资源股份有限公司

Dates

Publication Date
20260508
Application Date
20260225

Claims (10)

  1. 1. The preparation method of the high-nitrogen vanadium-nitrogen alloy is characterized by comprising the following steps of: Step 1, mixing and stirring wet-base industrial grade ammonium vanadate, a graphite carbon powder reducing agent, a metal iron powder catalyst and a water-based binder according to a mass ratio of 100 (18-22) (0.2-0.5) (8-20) to obtain a mixed material; step 2, pressing and forming the mixed material to obtain a preformed material; and 3, sequentially carrying out low-temperature presintering dehydration treatment, high-temperature nitriding reduction treatment and cooling annealing treatment on the preformed material to obtain the high-nitrogen vanadium-nitrogen alloy.
  2. 2. The method for preparing a high nitrogen vanadium nitrogen alloy according to claim 1, wherein in step 1, the total vanadium content of the wet-based industrial grade ammonium vanadate is not less than 49.5%.
  3. 3. The method for preparing the high-nitrogen vanadium-nitrogen alloy according to claim 1, wherein in the step 1, the carbon content of the graphite carbon powder is more than or equal to 98%, the particle size is 100-200 meshes, the purity of the metal iron powder is more than or equal to 99.5%, and the particle size is 200-300 meshes.
  4. 4. The method of claim 1, wherein in step 1, the water-based binder is one or more of starch binder, sodium carboxymethyl cellulose binder, and polyvinyl alcohol binder.
  5. 5. The method for preparing the high-nitrogen vanadium-nitrogen alloy according to claim 1, wherein in the step 1, the mixing and stirring time is 10-30 min.
  6. 6. The method for preparing a high-nitrogen vanadium-nitrogen alloy according to claim 1, wherein in the step 2, the pressure of the press forming is 2-8 mpa.
  7. 7. The method for preparing a high nitrogen vanadium nitrogen alloy according to claim 1, wherein in step 2, the pressure maintaining time of the press forming is 3-8 min.
  8. 8. The method of claim 1, wherein in step 2, the preformed material is in the shape of a short cylinder, ellipsoid or octahedron.
  9. 9. The method for producing a high nitrogen vanadium nitrogen alloy according to claim 1, wherein in step 3, The temperature of the low-temperature presintering dehydration treatment is 400-800 ℃, and the heat preservation time is 1-2 h; the temperature of the high-temperature nitriding reduction treatment is 1200-1400 ℃, the heat preservation time is 2-4 h, and the nitrogen flow is 120-260 m < 3 >/h; the cooling rate of the cooling annealing treatment is 5-10 ℃ per minute.
  10. 10. A high-nitrogen vanadium-nitrogen alloy is characterized by comprising the high-nitrogen vanadium-nitrogen alloy prepared by the preparation method of any one of claims 1-9.

Description

Preparation method of high-nitrogen vanadium-nitrogen alloy and high-nitrogen vanadium-nitrogen alloy Technical Field The disclosure relates to the technical field of metallurgy, in particular to a preparation method of a high-nitrogen vanadium-nitrogen alloy and the high-nitrogen vanadium-nitrogen alloy. Background The vanadium-nitrogen alloy is an important steel additive, has the main components of vanadium (V) and nitrogen (N), has good strengthening and toughening effects, and can obviously improve the strength, the hardness and the wear resistance of steel without reducing the toughness of the steel, so that the vanadium-nitrogen alloy is widely applied to the field of high-end steel production, such as high-strength screw thread steel, automobile girder steel, high-strength steel for engineering machinery and the like. Along with the rapid development of high-end manufacturing industry and transformation upgrading of steel industry in China, the productivity of high-end steel is continuously expanded, the market demand for vanadium-nitrogen alloy is steadily increased, the optimization demand for vanadium-nitrogen alloy preparation process in industry is increasingly urgent, and the core aim is to realize low-cost, low-energy consumption, short flow and high-stability production. At present, the main stream production process of vanadium-nitrogen alloy uses high-purity vanadium pentoxide (V 2O5) or vanadium trioxide (V 2O3) as vanadium-containing raw material, and related technologies have been disclosed in various patents, for example, CN107673317B discloses a preparation method of high-nitrogen vanadium-nitrogen alloy, which uses V 2O5 as raw material, and uses the raw material, carbon powder and binder to mix and form, then uses high-temperature nitriding sintering to prepare vanadium-nitrogen alloy with higher nitrogen content, and CN117070780A discloses a method for preparing vanadium-nitrogen alloy at low temperature and high efficiency, and also uses high-purity V 2O5 as raw material, and uses the catalyst to reduce reaction temperature and shorten reaction period. The core limitations of this type of process are: 1. The raw material cost is high, the pretreatment flow is complex, the preparation of the high-purity V 2O5 or V 2O3 needs a plurality of pretreatment procedures such as roasting, leaching, purifying, calcining and the like of the vanadium ore, the flow is long, the equipment input amount is large, the purchase cost of the high-purity vanadium oxide accounts for more than 60 percent of the total cost of the vanadium-nitrogen alloy product, the comprehensive production cost of the product is directly high, and the market competitiveness of enterprises is restricted. 2. The energy consumption is high, the production period is long, the reaction temperature of the traditional carbothermic reduction nitridation process needs to be maintained above 1500 ℃, the energy consumption of unit products is extremely high and is usually more than 6000kWh/t, meanwhile, the single reaction time is as long as 15-20h, the productivity efficiency is low, and the requirement of large-scale industrial production is difficult to meet. 3. The environmental protection pressure is high, a large amount of waste water and waste gas can be generated in the raw material purification pretreatment process, extra environmental protection equipment is needed for treatment, the production burden is increased, ammonia-containing flue gas can be generated in the raw material pretreatment (such as drying and calcining) adopted in part of the process, and the environmental protection pressure is further increased. In order to solve the problems, related improvement technology research and development are carried out in the industry, and the existing optimized preparation technology is mainly divided into three types, but has obvious technical limitations, and the pain points of the industry cannot be fundamentally broken: (1) The process adopts ammonium polyvanadate as a raw material to replace the traditional high-purity vanadium oxide, and for example, CN103754839B discloses a method for preparing vanadium-nitrogen alloy by using ammonium polyvanadate as a raw material, which comprises the steps of drying ammonium polyvanadate, calcining for deamination, mixing with carbon powder for molding, and then nitriding and sintering. The process has certain optimization on the cost of raw materials, but needs to carry out pretreatment procedures such as drying, calcining deamination and the like on ammonium polyvanadate, has limited process simplification degree, can not completely save pretreatment links, and meanwhile, needs to add various auxiliary reagents in the reaction process, so that the cost of the reagents is increased, the impurity content of a product is possibly increased, the stability of the nitrogen content of the finished product is poor, the technical requirements of vanadium-nitrogen alloy in national stan