CN108998685A - A method of improving VN alloy nitrogen content - Google Patents
A method of improving VN alloy nitrogen content Download PDFInfo
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- CN108998685A CN108998685A CN201810657474.1A CN201810657474A CN108998685A CN 108998685 A CN108998685 A CN 108998685A CN 201810657474 A CN201810657474 A CN 201810657474A CN 108998685 A CN108998685 A CN 108998685A
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- nitrogen content
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- nitridation
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
- C22C1/053—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds
- C22C1/055—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds using carbon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/16—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on nitrides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
Abstract
The present invention provides a kind of method for improving VN alloy nitrogen content comprising following steps: raw material grinding, ingredient, ingredient mixing, green compact, body drying, firing and discharging.A kind of method of raising VN alloy nitrogen content of the invention, by adding nitridation promotor in ingredient, the dynamic conditions for improving and enhancing carbonization, nitridation improves the nitrogen content in product and is allowed to keep stablizing, and other compositions content is maintained within claimed range；The intensity of product is further increased simultaneously, product apparent density is made to reach 3.5g/cm3 or more.
Description
Technical field
The present invention relates to VN alloy preparation technical fields, more particularly to a kind of side for improving VN alloy nitrogen content
Method.
Background technique
VN alloy is used for the production of micro alloyed steel as a kind of novel steel additive agent, alternative vanadium iron, it is added
The comprehensive mechanical performances such as the intensity, toughness, ductility and thermal fatigue resistance of steel can be improved in steel, and make steel have it is good can
Weldering property；In the case where reaching same intensity, addition VN alloy relatively addition vanadium can save vanadium 30% ~ 40%, reduce costs；VN alloy
It is generally used by domestic and international steel mill, production technology and production equipment have obtained swift and violent development.
Currently, VN alloy produces the oxide using vanadium with addition of reducing agent, and restored in all kinds of smelting furnaces
Calcining is smelted.The oxide of vanadium is usually vanadic anhydride and vanadium trioxide, by being pressed into addition of mixing after carburization agent
Type and after drying, is carbonized or nitrogenizes under the high temperature conditions and produced.The disadvantage of this method is containing for product VN alloy
Nitrogen quantity is unstable, and fluctuation is big, cannot stablize and produce the higher product of nitrogen content.
Summary of the invention
In view of the above technical problems, the object of the present invention is to provide improve VN alloy in a kind of VN alloy preparation process
The method of nitrogen content.
To achieve the object of the present invention, the method for a kind of raising VN alloy nitrogen content of the invention, comprising the following steps:
S1. raw material is ground: raw material containing barium oxide is taken, it is levigate by roller mill, and then it is sampled analysis；
S2. ingredient: according to sampling analysis as a result, calculating the amount of allocating of reducing agent and catalyst, then implement ingredient；
S3. ingredient mixes: ingredient being added after dry-mixed machine mixing 25-35 minutes the binder of weight ratio 9.5% ~ 11%, so
It carries out wet mixing afterwards and wet mixing is uniform, nitridation promotor is added before wet mixing terminates；
S4. green compact: the uniform material of wet mixing is subjected to pressure ball molding operation, obtains green body；
S5. body drying: green body is 9 ~ 12 hours dry in 195 ~ 210 DEG C of temperature；
S6. it fires: the green body after drying being sent into vanadium-nitrogen alloy sintering kiln and is sintered；
S7. it discharges.
Preferably, the raw material containing barium oxide is vanadic anhydride or vanadium trioxide.
It further preferably, in step s3, is that ingredient is mixed to the bonding that weight ratio 10% is added after twenty minutes by dry-mixed machine
Agent.
It further preferably, in step s 5, is that green body is 10 hours dry in 200 DEG C of temperature
Further preferably, the temperature of decomposition or the gasification of the nitridation promotor is lower than 800 DEG C.
Further preferably, the nitridation promotor is NH4HCO3、(NH4)2SO4、NH4Cl, rice husk, in organic particle
One or more mixtures.
Further preferably, the vanadium-nitrogen alloy sintering kiln includes drying and dehydrating section, prereduction section, reduction and carbonization section and height
Temperature nitridation four functional sections of section nitrogenize after promotor resolves into gas or gasification in drying and dehydrating section and prereduction section and export base
Body forms microcosmic duct in green body.
Further preferably, the reducing agent is carbonaceous reducing agent, and catalyst is the oxide of iron and iron.
Further preferably, the reducing agent is graphite.
Compared with prior art, the method for a kind of raising VN alloy nitrogen content of the invention, is mixed by ingredient, is first done
Binder is mixed, before wet mixing terminates plus nitridation promotor nitrogenizes promotor and be located at so that each ingredient in green body is uniformly distributed
In the gap of barium oxide and carbonaceous reducing agent, so as to form the microcosmic duct of relatively uniform distribution in green body；Pass through
Addition nitridation promotor, improves and enhances the dynamic conditions of carbonization, nitridation, improve the nitrogen content in product in ingredient
And be allowed to keep stablizing, and other compositions content is maintained within claimed range；The intensity for further increasing product simultaneously, makes
Product apparent density reaches 3.5g/cm3 or more.
Detailed description of the invention
Through the following detailed description taken in conjunction with the accompanying drawings, present invention objects, features and advantages above-mentioned and other will become
Obviously.Wherein:
Fig. 1 is a kind of flow diagram of the method for raising VN alloy nitrogen content of the invention；
Fig. 2 show position signal of the nitridation promotor in green body in the method for raising VN alloy nitrogen content of the invention
Figure；
Fig. 3 show in the method for raising VN alloy nitrogen content of the invention nitrogenize promotor from green body overflow after formed it is micro-
The structural schematic diagram in view hole road.
Specific embodiment
To make to have further understanding to the purpose of the present invention, construction, feature and its function, hereby cooperate embodiment detailed
It is described as follows.
It is as shown in Figure 1 the flow diagram of the method for raising VN alloy nitrogen content of the invention, according to the process
The preparation test process that schematic diagram carries out VN alloy is as follows:
1) a collection of raw material i.e. vanadic anhydride is taken, it is levigate by roller mill, then it is sampled analysis；
2) according to sampling analysis as a result, the amount of allocating of calculating reducing agent and catalyst, then implements ingredient；
3) raw material and ingredient are equally divided into 4 parts after dry-mixed machine mixes 30 minutes；
4) 10% or so binder is added into every a mixture, then wet mixing is uniform；To every part of raw material before wet mixing terminates
The middle corresponding nitridation promotor of addition；The additional amount of promotor is nitrogenized according to the original that identical molal quantity nitrogen is added into every part of raw material
Then, i.e., to the nitridation accelerant A i.e. NH that 10 ㎏ are added in first part4Cl nitrogenizes accelerant B i.e. to 15 ㎏ are added in second part
NH4HCO3, 12 ㎏ nitridation accelerant C i.e. (NH is added into third part4)2SO4, the 4th part is not added nitridation promotor as a comparison
Example；
5) the uniform material of wet mixing is subjected to pressure ball molding operation, obtains green body；
6) green body is 9 ~ 12 hours dry in 195 ~ 210 DEG C of temperature；
7) green body after drying same sintering kiln is sent into be sintered；
8) sampling analysis.
Above-mentioned VN alloy preparation process, in ingredient mixing, first dry-mixed adding additives, then carry out wet mixing and in wet mixing
Before terminating plus nitridation promotor so that each ingredient in green body is uniformly distributed, nitridation promotor 10 be located at barium oxide and
In the gap of carbonaceous reducing agent (referring to fig. 2)；Vanadium-nitrogen alloy sintering kiln of the invention include drying and dehydrating section, prereduction section,
Four functional sections of reduction and carbonization section and high-temperature ammonolysis section, in drying and dehydrating section and prereduction section, i.e., in arid region and calcining kiln
The low-temperature space of furnace, nitridation promotor export green body after resolving into gas or gasification, during nitridation promotor leaves green body, gas
The path that body passes through green body forms countless microcosmic ducts (referring to Fig. 3)；When reduction and carbonization takes place in VN alloy green body
After reaction, by the microcosmic duct formed, the interior diffusion flux for increasing gas, is conducive to the life of reaction in a limited space
It is exported at object CO, so that reaction balance is moved right, enhance the generation of reduction reaction and carburizing reagent；When VN alloy green body is opened
After originating raw nitridation reaction, the N2 for participating in nitridation reaction is imported inside green body by microcosmic duct, increases N2Partial pressure, enhance
The generation of nitridation reaction, in this way, can effectively improve the nitrogen content in VN alloy.
Alloying component testing result such as the following table 1 of different nitridation promotors is added:
Table 1 show the alloying component testing result that different nitridation promotors are added and do not add nitridation promotor.
Table 1: VN alloy composition detection result table
| Sample number into spectrum | V | N | C | O | P | S |
| Not plus promotor (comparative example) | 77.74 | 14.1 | 6.2 | 0.56 | < 0.01 | < 0.01 |
| Accelerant A | 77.91 | 15.8 | 3.21 | 0.86 | < 0.01 | < 0.01 |
| Accelerant B | 78.51 | 16.8 | 2.83 | 0.37 | < 0.01 | < 0.01 |
| Accelerant C | 78.23 | 14.2 | 4.94 | 0.60 | < 0.01 | < 0.01 |
It is as follows to the impact analysis of Contents of Main Components to nitrogenize promotor:
1) V content: the influence to V content is little, is attained by the requirement of qualified products；
2) N content: the addition for nitrogenizing promotor has significant effect to the raising of nitrogen content in alloy, wherein nitridation is added and promotees
Into agent B, that is, NH4HCO3Alloy in nitrogen content highest；
3) impurity content: C content is substantially reduced in the sample of addition nitridation accelerant A and C；And add the sample of nitridation accelerant B
C, O content significantly reduce in product.
The present invention makees catalyst using the oxide of iron and iron, first is that reduce reaction activity, shorten carburizing reagent when
Between；Second is that the catalyst melts under the high temperature conditions, permeates in entire green body, promote the contraction of green body, improve significantly most
The density of finished product；Third is that can be used as one of the effective means of regulation product composition due to the addition of catalyst, alloy is improved
The performance of product makes V, N in product be maintained at certain ratio, while reducing the content of impurity element；Reduction of the invention
Agent is carbonaceous reducing agent such as graphite powder.
Nitridation promotor of the invention has characteristics that the temperature of decomposition or the gasification of nitridation promotor lower than 800 DEG C；
Nitridation promotor can be uniformly mixed into green body；There are no pollution to the environment after nitrogenizing promotor decomposition or export of gasifying；Nitridation promotees
Into agent in vanadium-nitrogen alloy product free from admixture component residue.
According to test result, nitridation promotor of the invention can select NH4HCO3、(NH4)2SO4、NH4Cl, rice husk, have
One of machine composition granule or a variety of mixtures；Wherein, especially with NH4HCO3Better effect.
A kind of method of raising VN alloy nitrogen content of the invention, is mixed by ingredient, first dry-mixed adding additives, rewetting
Mixed to terminate preceding plus nitridation promotor, so that each ingredient in green body is uniformly distributed, nitridation promotor is located at barium oxide and carbonaceous
In the gap of reducing agent, so as to form the microcosmic duct of relatively uniform distribution in green body；By adding nitrogen in ingredient
Change promotor, improve and enhance the dynamic conditions of carbonization, nitridation, improve the nitrogen content in product and is allowed to keep steady
It is fixed, and other compositions content is maintained within claimed range；The intensity of product is further increased simultaneously, keeps product apparently close
Degree reaches 3.5g/cm3 or more.
The present invention is described by above-mentioned related embodiment, however above-described embodiment is only to implement example of the invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from spirit of the invention and
It is changed and retouched made by range, belongs to scope of patent protection of the invention.
Claims (9)
1. a kind of method for improving VN alloy nitrogen content, which is characterized in that the described method comprises the following steps:
S1. raw material is ground: raw material containing barium oxide is taken, it is levigate by roller mill, and then it is sampled analysis；
S2. ingredient: according to sampling analysis as a result, calculating the amount of allocating of reducing agent and catalyst, then implement ingredient；
S3. ingredient mixes: ingredient being added after dry-mixed machine mixing 25-35 minutes the binder of weight ratio 9.5% ~ 11%, so
It carries out wet mixing afterwards and wet mixing is uniform, nitridation promotor is added before wet mixing terminates；
S4. green compact: the uniform material of wet mixing is subjected to pressure ball molding operation, obtains green body；
S5. body drying: green body is 9 ~ 12 hours dry in 195 ~ 210 DEG C of temperature；
S6. it fires: the green body after drying being sent into vanadium-nitrogen alloy sintering kiln and is sintered；
S7. it discharges.
2. a kind of method for improving VN alloy nitrogen content as described in claim 1, which is characterized in that described aoxidizes containing vanadium
Raw material is vanadic anhydride or vanadium trioxide.
3. a kind of method for improving VN alloy nitrogen content as described in claim 1, which is characterized in that in step s3, be
Ingredient is mixed to the binder that weight ratio 10% is added after twenty minutes by dry-mixed machine.
4. a kind of method for improving VN alloy nitrogen content as described in claim 1, which is characterized in that in step s 5, be
Green body is 10 hours dry in 200 DEG C of temperature.
5. a kind of method for improving VN alloy nitrogen content as described in claim 1, which is characterized in that the nitridation promotes
The decomposition of agent or the temperature of gasification are lower than 800 DEG C.
6. a kind of method for improving VN alloy nitrogen content as described in claim 1, which is characterized in that the nitridation promotes
Agent is NH4HCO3、(NH4)2SO4、NH4One of Cl, rice husk, organic particle or a variety of mixtures.
7. a kind of method for improving VN alloy nitrogen content as described in claim 1, which is characterized in that the VN alloy
Sintering kiln includes four drying and dehydrating section, prereduction section, reduction and carbonization section and high-temperature ammonolysis section functional sections, in drying and dehydrating section
With prereduction section, nitrogenizes after promotor resolves into gas or gasification and export green body, form microcosmic duct in green body.
8. a kind of method for improving VN alloy nitrogen content as described in claim 1, which is characterized in that the reducing agent is
Carbonaceous reducing agent, catalyst are the oxide of iron and iron.
9. a kind of method for improving VN alloy nitrogen content as claimed in claim 7, which is characterized in that the reducing agent is
Graphite.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693975A (en) * | 2009-10-28 | 2010-04-14 | 攀钢集团攀枝花钢钒有限公司 | Method for increasing nitrogen content of vanadium-nitrogen alloy |
| RU2462526C1 (en) * | 2011-07-04 | 2012-09-27 | Мансур Хузиахметович Зиатдинов | Method to obtain nitrogen-containing ligature |
| CN106546098A (en) * | 2015-09-23 | 2017-03-29 | 江苏渝鑫合金科技有限公司 | A kind of vanadium-nitrogen alloy sintering kiln |
| CN108193066A (en) * | 2017-12-29 | 2018-06-22 | 天津炜润达新材料科技有限公司 | A kind of production smelting process of VN alloy |
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2018
- 2018-06-25 CN CN201810657474.1A patent/CN108998685A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693975A (en) * | 2009-10-28 | 2010-04-14 | 攀钢集团攀枝花钢钒有限公司 | Method for increasing nitrogen content of vanadium-nitrogen alloy |
| RU2462526C1 (en) * | 2011-07-04 | 2012-09-27 | Мансур Хузиахметович Зиатдинов | Method to obtain nitrogen-containing ligature |
| CN106546098A (en) * | 2015-09-23 | 2017-03-29 | 江苏渝鑫合金科技有限公司 | A kind of vanadium-nitrogen alloy sintering kiln |
| CN108193066A (en) * | 2017-12-29 | 2018-06-22 | 天津炜润达新材料科技有限公司 | A kind of production smelting process of VN alloy |
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