阅读说明：本技术 生产钒系合金的全流程工艺方法 (Full-flow process method for producing vanadium series alloy ) 是由 吕韬 李秦灿 于洪翔 于 2020-05-21 设计创作，主要内容包括：本发明涉及资源回收及利用领域,涉及一种生产钒系合金全流程工艺方法,包括：以含钒钢渣、钒粉矿和烧结冷返矿为原料制备烧结矿；将所述烧结矿破碎、筛分后,与钒钛磁铁块矿、焦炭、硅石混料,送入矿热炉内进行冶炼,制得含钒铁水；将所述含钒铁水热兑入第一AOD炉,加入冷却剂后进行顶吹氧提钒,将钒富集到渣中得到富钒渣；将提钒后的铁水倒入第二AOD炉,加入造渣剂造渣,经脱磷、脱碳后得到低钒合金；将所述富钒渣送入电炉,加入还原剂、造渣剂生产硅钒合金；将所述硅钒合金粗破、球磨,配入粘结剂后压制成型,烘干后送入真空电阻炉内进行脱碳、渗氮,氮气气氛下冷却得到氮化硅钒。本发明的工艺方法变废为宝,具有显著的经济效益和广阔的市场前景。(The invention relates to the field of resource recovery and utilization, and relates to a full-flow process method for producing vanadium series alloy, which comprises the following steps: preparing sintered ore by using vanadium-containing steel slag, vanadium powder ore and sintered cold return ore as raw materials; crushing and screening the sintered ore, mixing the crushed and screened sintered ore with vanadium-titanium magnetite lump ore, coke and silica, and feeding the mixture into an ore smelting furnace for smelting to obtain vanadium-containing molten iron; hot blending the vanadium-containing molten iron into a first AOD furnace, adding a coolant, and then carrying out top blowing oxygen extraction to extract vanadium, so as to enrich the vanadium in slag to obtain vanadium-rich slag; pouring the molten iron after vanadium extraction into a second AOD furnace, adding a slagging agent for slagging, and carrying out dephosphorization and decarburization to obtain a low-vanadium alloy; feeding the vanadium-rich slag into an electric furnace, and adding a reducing agent and a slagging constituent to produce silicon-vanadium alloy; and roughly crushing and ball-milling the silicon-vanadium alloy, adding a binder, then performing compression molding, drying, then sending into a vacuum resistance furnace for decarburization and nitridation, and cooling in a nitrogen atmosphere to obtain silicon-vanadium nitride. The process method changes waste into valuable, and has remarkable economic benefit and wide market prospect.)

1. A full-flow process method for producing vanadium series alloy is characterized by comprising the following steps:

(1) crushing and screening the sintering ore, mixing the crushed sintering ore with vanadium-titanium magnetite lump ore, coke and silica according to a ratio, and feeding the mixture into an ore smelting furnace for smelting to prepare vanadium-containing molten iron;

(2) hot blending the vanadium-containing molten iron into a first AOD furnace, adding a coolant, then carrying out top oxygen blowing to extract vanadium, carrying out bottom argon blowing or nitrogen blowing to carry out reinforced stirring, and enriching vanadium into slag to obtain vanadium-enriched slag;

(3) pouring the molten iron after vanadium extraction into a second AOD furnace, adding a slagging agent for slagging, and carrying out dephosphorization and decarburization to obtain a low-vanadium alloy;

(4) feeding the vanadium-rich slag into an electric furnace, adding a reducing agent and a slagging constituent, and producing silicon-vanadium alloy by an electro-silicothermic process;

(5) and roughly crushing and ball-milling the silicon-vanadium alloy, adding a binder, then performing compression molding, drying, then sending into a vacuum resistance furnace for decarburization and nitridation, and cooling in a nitrogen atmosphere to obtain silicon-vanadium nitride.

2. The full-flow process method for producing the vanadium series alloy according to claim 1, wherein the preparation method of the sinter comprises the following steps: the vanadium-containing steel slag, vanadium powder ore and sintered cold return ore are used as raw materials, coke powder, dedusting ash and bentonite are added after uniform mixing and ball milling, and the materials are mixed, granulated and then sent into a roasting furnace for sintering.

3. The full-flow process method for producing the vanadium series alloy according to claim 1 or 2, which is characterized by further comprising the following steps of: and feeding the silicon vanadium nitride into an intermediate frequency furnace for induction remelting to obtain the high-density silicon vanadium nitride.

4. The full-flow process method for producing vanadium-containing alloy according to claim 2, wherein the steel slag containing vanadium is vanadium-poor steel slag obtained by steel-making of vanadium titano-magnetite.

5. The full-flow process method for producing vanadium-series alloy according to claim 1, wherein the dephosphorization and decarbonization process in the second AOD furnace comprises the following steps: top blowing oxygen, side blowing argon or nitrogen and oxygen mixed gas, and bottom blowing argon or nitrogen.

6. The full-flow process method for producing vanadium series alloy according to claim 1, wherein the coolant is sintered ore or vanadium-titanium magnetite ore or any combination of the two; the reducing agent is ferrosilicon or metallic silicon or any combination of the ferrosilicon and the metallic silicon.

7. The full-flow process method for producing the vanadium series alloy according to claim 1, wherein the slag former in the step (3) is lime; the slagging agent in the step (4) is lime or limestone or any combination of the lime and the limestone; the binder is any one of water glass, polyvinyl alcohol and cellulose.

8. The full-flow process method for producing vanadium-series alloy according to claim 1, wherein the low-vanadium alloy comprises the following components in percentage by weight: fe 96.91-97.02%, C0.85-0.93%, V0.06-0.20%, P0.01-0.04%.

9. The full-flow process method for producing vanadium-series alloy according to claim 1, wherein the silicon-vanadium alloy comprises the following components in percentage by weight: fe 54.48-71.73%, Si 19.66-21.15%, V5.63-20.34%, C < 0.50%.

10. The full-flow process method for producing vanadium-series alloy according to claim 1, wherein the silicon vanadium nitride comprises the following components in percentage by weight: fe 44.15-55.38%, C0.14-0.45%, Si 6.67-33.01%, V5.85-23.04%, and N7.60-14.54%.

Technical Field

The invention relates to the field of resource recovery and utilization, relates to a full-flow process method for producing vanadium series alloy, and particularly relates to a full-flow process method for producing vanadium series alloy by smelting vanadium-containing steel slag.

Background

Vanadium is called "universal alloy" and is widely used in the steel industry because it can greatly increase the elasticity and strength of steel and has excellent wear and blast resistance when a small amount of vanadium is added to the steel. With the advent of new national screw-thread steel standards, the banning of the production of high strength hot rolled steel bars by the "through-water" process has undoubtedly stimulated a great demand for vanadium alloys.

Vanadium titano-magnetite is the main mineral resource of vanadium, and most of vanadium in the world is obtained from vanadium currently. The following vanadium extraction process is mainly adopted at home: the vanadium-titanium magnetite ore is subjected to ore dressing and then is sent into a blast furnace to be smelted to obtain vanadium-containing molten iron, then the vanadium-containing molten iron enters a converter to be selectively oxidized and extracted to obtain semisteel and vanadium-rich slag, the vanadium-rich slag is used for extracting vanadium by a wet method, and the semisteel is sent to the converter to be smelted. Because partial vanadium slag flows out along with the semi-steel when the semi-steel is poured, the semi-steel contains residual vanadium, and partial molten iron is directly added into a steelmaking furnace without extracting vanadium due to the limitation of the processing capacity of individual procedures, so that the final steel slag still contains a lot of vanadium, and partial steel slag V still contains V₂O₅The content is as high as 5 percent. At present, the part of steel slag is not effectively utilized, and most of the steel slag is discarded and buried, so that the resource is seriously wasted.

The steel slag returning method is characterized in that the steel slag containing vanadium is used as a fusing agent of sintering ore and is sent into a blast furnace for smelting again, the method is applied to steel climbing and horse steel, new equipment is not needed to be added, but the phosphorus is easily circularly enriched in molten iron, and the method is not favorable for subsequent dephosphorization and steelmaking. As for the wet process, the sodium roasting causes environmental pollution, and the treatment of the vanadium-containing steel slag with high calcium and low vanadium is difficult, although the calcified roasting avoids the generation of harmful gas, certain selectivity exists, the conversion rate is low, and the cost is high. Therefore, the existing vanadium extraction technology is limited in treating vanadium-containing steel slag, and an economical and efficient vanadium extraction method is urgently needed.

Disclosure of Invention

The invention aims to provide a full-flow process method for producing vanadium series alloy aiming at the defects of the prior art.

Specifically, the full-flow process method for producing the vanadium series alloy comprises the following steps:

(1) crushing and screening the sintering ore, mixing the crushed sintering ore with vanadium-titanium magnetite lump ore, coke and silica according to a ratio, and feeding the mixture into an ore smelting furnace for smelting to prepare vanadium-containing molten iron;

(2) hot blending the vanadium-containing molten iron into a first AOD furnace, adding a coolant, then carrying out top oxygen blowing to extract vanadium, carrying out bottom argon blowing or nitrogen blowing to carry out reinforced stirring, and enriching vanadium into slag to obtain vanadium-enriched slag;

(3) pouring the molten iron after vanadium extraction into a second AOD furnace, adding a slagging agent for slagging, and carrying out dephosphorization and decarburization to obtain a low-vanadium alloy;

(4) feeding the vanadium-rich slag into an electric furnace, adding a reducing agent and a slagging constituent, and producing silicon-vanadium alloy by an electro-silicothermic process;

(5) and roughly crushing and ball-milling the silicon-vanadium alloy, adding a binder, then performing compression molding, drying, then sending into a vacuum resistance furnace for decarburization and nitridation, and cooling in a nitrogen atmosphere to obtain silicon-vanadium nitride.

The preparation method of the sintered ore comprises the following steps: the vanadium-containing steel slag, vanadium powder ore and sintered cold return ore are used as raw materials, coke powder, dedusting ash and bentonite are added after uniform mixing and ball milling, and the materials are mixed, granulated and then sent into a roasting furnace for sintering.

The full-flow process method for producing the vanadium series alloy further comprises the following steps: and feeding the silicon vanadium nitride into an intermediate frequency furnace for induction remelting to obtain the high-density silicon vanadium nitride.

According to the full-flow process method for producing the vanadium-containing alloy, the steel slag containing vanadium is vanadium-poor steel slag finally obtained from vanadium-titanium magnetite in a steel-making link.

According to the full-flow process method for producing the vanadium series alloy, the dephosphorization and decarburization processes in the second AOD furnace comprise the following steps: top blowing oxygen, side blowing argon or nitrogen and oxygen mixed gas, and bottom blowing argon or nitrogen.

In the full-flow process method for producing the vanadium series alloy, the coolant is sinter ore or vanadium-titanium magnetite ore or any combination of the sinter ore and the vanadium-titanium magnetite ore; the reducing agent is ferrosilicon or metallic silicon or any combination of the ferrosilicon and the metallic silicon.

In the full-flow process method for producing the vanadium series alloy, the slagging agent in the step (3) is lime; the slagging agent in the step (4) is lime or limestone or any combination of the lime and the limestone; the binder is any one of water glass, polyvinyl alcohol and cellulose.

According to the full-flow process method for producing the vanadium alloy, the low-vanadium alloy comprises the following components in percentage by weight: fe96.91-97.02%, C0.85-0.93%, V0.06-0.20%, P0.01-0.04%.

According to the full-flow process method for producing the vanadium series alloy, the silicon-vanadium alloy comprises the following components in percentage by weight: fe54.48-71.73%, Si 19.66-21.15%, V5.63-20.34%, and C less than 0.50%.

According to the full-flow process method for producing the vanadium series alloy, the silicon vanadium nitride comprises the following components in percentage by weight: fe44.15-55.38%, C0.14-0.45%, Si 6.67-33.01%, V5.85-23.04%, and N7.60-14.54%.

The technical scheme of the invention has the following beneficial effects:

(1) the full-flow process method for producing the vanadium series alloy can effectively solve the environmental problem caused by the production of a large amount of dephosphorized steel slag in a steel mill, serves the operation and development of the steel mill, simultaneously recycles the vanadium resource in the steel slag, and processes the vanadium resource into a domestic scarce material, thereby fully embodying the characteristics of environmental friendliness and circular economy;

(2) according to the full-flow process method for producing the vanadium series alloy, the vanadium resource in the vanadium-containing steel slag can be extracted through a series of pyrogenic process procedures, and converted into low vanadium alloy, silicon vanadium nitride and the like with higher added values, so that waste is changed into wealth, and the full-flow process method has remarkable economic benefits and wide market prospects.

Detailed Description

The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.

The terms "first," "second," and the like, as used herein do not denote any order or importance, but rather are used to distinguish one element from another, and the terms "the," "one," and "an" do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. In addition, all ranges disclosed herein are inclusive of the endpoints and independently combinable.

Specifically, the invention provides a full-flow process method for producing vanadium series alloy, which comprises the following steps:

(1) crushing and screening the sintering ore, mixing the crushed sintering ore with vanadium-titanium magnetite lump ore, coke and silica according to a ratio, and feeding the mixture into an ore smelting furnace for smelting to prepare vanadium-containing molten iron;

(2) hot blending the vanadium-containing molten iron into a first AOD furnace, adding a coolant, then carrying out top oxygen blowing to extract vanadium, carrying out bottom argon blowing or nitrogen blowing to carry out reinforced stirring, and enriching vanadium into slag to obtain vanadium-enriched slag;

(3) pouring the molten iron after vanadium extraction into a second AOD furnace, adding a slagging agent for slagging, and carrying out dephosphorization and decarburization to obtain a low-vanadium alloy;

(4) feeding the vanadium-rich slag into an electric furnace, adding a reducing agent and a slagging constituent, and producing silicon-vanadium alloy by an electro-silicothermic process;

(5) and roughly crushing and ball-milling the silicon-vanadium alloy, adding a binder, then performing compression molding, drying, then sending into a vacuum resistance furnace for decarburization and nitridation, and cooling in a nitrogen atmosphere to obtain silicon-vanadium nitride.

The full-flow process method for smelting and producing the vanadium series alloy can effectively solve the environmental problem caused by the production of a large amount of dephosphorized steel slag in a steel mill, provides service for the operation and development of the steel mill, simultaneously recovers the vanadium resource in the steel slag, processes the vanadium resource into domestic scarce materials, and fully embodies the characteristics of environmental friendliness and circular economy.

In some preferred embodiments, the full-flow process method for producing vanadium-based alloy of the present invention comprises:

(1) crushing and screening the sintering ore, mixing the crushed sintering ore with vanadium-titanium magnet lump ore, coke and silica according to a ratio, and feeding the mixture into an ore smelting furnace for smelting to obtain vanadium-containing molten iron.

Preferably, the weight ratio of the sintered ore, the vanadium-titanium magnetite lump ore, the coke and the silica is 65-90: 10-35: 19.64 to 29.12: 3.35 to 11.15.

Further preferably, the smelting temperature for smelting in the submerged arc furnace is 1650-1700 ℃.

The preparation method of the sintered ore comprises the following steps: the vanadium-containing steel slag, vanadium powder ore and sintered cold return ore are used as raw materials, coke powder, dedusting ash and bentonite are added after uniform mixing and ball milling, and the materials are mixed, granulated and then sent into a roasting furnace for sintering.

The vanadium-containing steel slag is vanadium-poor steel slag obtained by performing a steel making link on the vanadium-titanium magnetite, and is not vanadium-rich slag obtained after vanadium is extracted through converter oxidation, so that the utilization rate of vanadium is improved, and the production cost is reduced;

preferably, the weight ratio of the vanadium-containing steel slag to the vanadium powder ore to the sintered cold return ore is 40-50: 20-45: 15-30; the weight ratio of the vanadium-containing mixed powder, the dedusting ash, the coke powder and the bentonite is 100: 1-3.5: 1.5-3: 0.5 to 2.5.

The sintering is that the material sequentially passes through four sections of drying, preheating, sintering and cooling from top to bottom in the horizontal direction in a roasting furnace. Preferably, the drying temperature is 300-350 ℃, the preheating temperature is 1000-1150 ℃, the sintering temperature is 1350-1500 ℃, and the cooling is carried out until the temperature is less than or equal to 200 ℃.

Wherein the composition of the sintered ore is TFe 29.5-38.3%, CaO 18.6-33.2%, and SiO₂7.5～9.4％、MgO 4.1～7.8％、Al₂O₃2.1～3.5％、V₂O₅0.9 to 1.8 percent. The sintered ore has stable components, uniform granularity and good metallurgical performance, and can meet the smelting requirements of a subsequent submerged arc furnace.

The method provided by the invention is used for smelting vanadium-containing steel slag by a submerged arc furnace through a carbothermic method to prepare vanadium-containing pig iron, the process flow is short, the raw material adaptability is strong, and the vanadium resource in the steel slag can be effectively recovered.

(2) And hot blending the vanadium-containing molten iron into a first AOD furnace, adding a coolant, then carrying out top oxygen blowing to extract vanadium, carrying out bottom argon blowing or nitrogen blowing to carry out reinforced stirring, and enriching vanadium into slag to obtain vanadium-enriched slag.

The coolant is sintered ore or vanadium-titanium magnet lump ore or any combination of the sintered ore and the vanadium-titanium magnet lump ore.

Preferably, when the first AOD furnace is used for converting, the pressure of oxygen during top blowing is 0.6-0.7 MPa, and the oxygen flow isThe pressure of the inert gas (argon or nitrogen) is 0.2-0.3 MPa, and the flow rate of the inert gas is

Wherein V in the vanadium-rich slag₂O₅The content is 14 to 20 wt%.

Wherein the smelting temperature of the first AOD furnace is 1420-1455 ℃.

Carrying out primary refining on the molten iron in a first AOD furnace, wherein the primary refining mainly carries out oxidation reaction of vanadium, and the vanadium in the molten iron is oxidized into slag to obtain vanadium-rich slag; at the same time, a small carbon loss, i.e. oxidation of the carbon, also occurs.

(3) And pouring the molten iron after vanadium extraction into a second AOD furnace, adding a slagging agent for slagging, and carrying out dephosphorization and decarburization to obtain the low-vanadium alloy.

The dephosphorization and decarbonization process in the second AOD furnace comprises the following steps: top blowing oxygen, side blowing argon or nitrogen and oxygen mixed gas, and bottom blowing argon or nitrogen.

Preferably, the pressure of oxygen during top-blown oxygen is 0.6-0.7 MPa, and the flow rate is When the mixed gas of inert gas (argon or nitrogen) and oxygen is blown into the side part, the pressure of the mixed gas is 0.6-0.7 MPa, and the flow rate is

Preferably, the volume ratio of the inert gas (argon or nitrogen) to the oxygen in the mixed gas is (1:5) to (1: 2).

Wherein, the slagging agent is lime, optionally, a small amount of dolomite, fluorite and the like can also be added.

Wherein the low vanadium alloy comprises, in weight percent: fe 96.91-97.02%, C0.85-0.93%, V0.06-0.20%, P0.01-0.04%. The low-vanadium alloy has moderate vanadium content and low carbon and phosphorus content, and the ingot can be directly used for downstream steel users after being finished.

According to the invention, vanadium is enriched into slag through two AOD furnace refining, and vanadium-enriched slag for sale and low-vanadium alloy with reasonable carbon and phosphorus content are finally obtained, so that resources are effectively utilized

(4) And (3) feeding the vanadium-rich slag into an electric furnace, adding a reducing agent and a slag former, and producing the silicon-vanadium alloy by an electro-silicothermic process.

The reducing agent is ferrosilicon or metallic silicon or any combination of the ferrosilicon and the metallic silicon, and the slagging agent is lime and/or limestone.

Preferably, the weight ratio of the vanadium-rich slag to the reducing agent to the slag former is (35.86-51.08): (5.92-22.07): (33.58-56.25).

Preferably, the furnace temperature of the electric furnace is 1650-1700 ℃ during smelting.

The silicon-vanadium alloy comprises, by weight, Fe 54.48-71.73%, Si 19.66-21.15%, V5.63-20.34% and C less than 0.50%.

According to the invention, vanadium resources in the vanadium slag are directly smelted into silicon-vanadium alloy required by downstream steel industry in a pyrometallurgical manner, so that an intermediate wet process is omitted, the process is simple, the operation is convenient, the cost is greatly reduced, the method is not limited by the contents of CaO and FeO in the vanadium slag raw materials, and the method has remarkable economic benefit.

(5) And roughly crushing and ball-milling the silicon-vanadium alloy, adding a binder, then performing compression molding, drying, then sending into a vacuum resistance furnace for decarburization and nitridation, and cooling in a nitrogen atmosphere to obtain silicon-vanadium nitride.

The binder is any one of water glass, polyvinyl alcohol and cellulose, and accounts for 3-6 wt% of the total mixed material.

Preferably, the decarburization temperature is 1250-1450 ℃, the pressure is 1-10 Pa, and the decarburization is kept for 6-10 h.

Preferably, the nitriding temperature is 1000-1150 ℃, the nitrogen purity is 99.999%, the pressure is 80 kPa-0.1 MPa, and the nitriding is kept for 12-15 hours.

The silicon vanadium nitride comprises the following components in percentage by weight: fe 44.15-55.38%, C0.14-0.45%, Si 6.67-33.01%, V5.85-23.04%, and N7.60-14.54%.

Further preferably, the full-flow process method for producing the vanadium series alloy further comprises the following steps: and feeding the silicon vanadium nitride into an intermediate frequency furnace for induction remelting to obtain the high-density silicon vanadium nitride.

According to the invention, by remelting the nitriding alloy, the density and strength of the silicon vanadium nitride can be effectively improved, the water content is reduced, and the requirements of downstream steel industry users are met.

In some more preferred embodiments, the full-flow process method for producing vanadium-based alloy of the present invention comprises the following steps:

(1) mixing vanadium-containing steel slag, vanadium powder ore and sintered cold return ore according to the weight ratio of 40-50: 20-45: 15-30, ball-milling to a certain particle size, and mixing the vanadium-containing mixed powder, the fly ash, the coke powder and the bentonite according to a weight ratio of 100: 1-3.5: 1.5-3: adding coke powder, dedusting ash and bentonite according to the proportion of 0.5-2.5, mixing, granulating and then feeding into a roasting furnace. And sequentially drying the mixture in the horizontal movement direction at 300-350 ℃, preheating at 1000-1150 ℃ and sintering at 1350-1500 ℃, and cooling to less than or equal to 200 ℃ to obtain the sinter.

(2) Crushing and screening the sintered ore, wherein the weight ratio of the qualified finished product to the vanadium-titanium magnetite lump ore, coke and silica is 65-90: 10-35: 19.64 to 29.12: 3.35-11.15, transferring the mixed materials to a transition bin at the top of a sealed submerged arc furnace by an adhesive tape machine, then dropping the materials to a rotary distributor, adding the materials into the bin at the top of the furnace, continuously adding the materials into the furnace through a material pipe, and smelting at the temperature of 1650-1700 ℃ to obtain the vanadium-containing pig iron.

(3) And hot blending vanadium-containing molten iron into the first AOD furnace, carrying out top-blown oxygen vanadium extraction, simultaneously blowing argon or nitrogen at the bottom for reinforced stirring, adding part of sinter to adjust the temperature to 1420-1455 ℃, and oxidizing vanadium into slag to obtain vanadium-rich slag. Wherein the pressure of oxygen during top blowing is 0.6-0.7 MPa, and the oxygen flow isThe pressure of the inert gas (argon or nitrogen) is 0.2-0.3 MPa, and the flow rate of the inert gas is

(4) And pouring the molten iron after vanadium extraction into a second AOD furnace, adding lime for slagging, and removing carbon and phosphorus to a reasonable range through stirring molten pools of top-blown oxygen, side-blown argon (or nitrogen) and oxygen mixed gas, bottom-blown argon (or nitrogen) and the like to obtain the low-vanadium alloy. Wherein the pressure of oxygen during top blowing is 0.6-0.7 MPa, and the flow rate is

When the mixed gas of inert gas (argon or nitrogen) and oxygen is blown into the side part, the pressure of the mixed gas is 0.6-0.7 MPa, and the flow rate is

(5) Feeding the vanadium-rich slag into a tilting electric furnace, adding a proper amount of reducing agent and slag former according to the weight ratio of the vanadium-rich slag to the reducing agent to the slag former of (35.86-51.08), (5.92-22.07) and (33.58-56.25), electrifying, submerged arc smelting, and obtaining the silicon-vanadium alloy at the furnace temperature of 1650-1700 ℃.

(6) After the alloy is cooled, crushing the alloy to be less than 20mm, then ball-milling the alloy to-100 meshes, then adding 3-6 wt% of binder, mixing the materials, carrying out compression molding, drying the mixture, then sending the dried mixture into a vacuum resistance furnace, carrying out vacuum decarburization at 1250-1450 ℃ under the pressure of 1-10 Pa, carrying out nitriding treatment at 1000-1150 ℃, the nitrogen purity of 99.999% and the pressure of 80 kPa-0.1 MPa, then cooling the mixture under the nitrogen atmosphere, and discharging the cooled mixture out of the furnace to obtain the silicon vanadium nitride (low density).

(7) Finally, the alloy is sent into an intermediate frequency furnace for induction remelting so as to improve the density and the strength of the alloy.

Through detection, the low-vanadium alloy produced by the invention comprises the following components in percentage by weight: fe96.91-97.02%, C0.85-0.93%, V0.06-0.20%, P0.01-0.04%; the silicon-vanadium alloy comprises: fe54.48-71.73%, Si 19.66-21.15%, V5.63-20.34%, and C less than 0.50%; the silicon vanadium nitride comprises: fe44.15-55.38%, C0.14-0.45%, Si 6.67-33.01%, V5.85-23.04%, and N7.60-14.54%.

The full-flow process method for producing the vanadium series alloy realizes the purpose of converting vanadium resources in the vanadium-poor steel slag into low vanadium alloy, silicon vanadium alloy and silicon vanadium nitride with higher added values, changes waste into valuable, and has obvious economic benefit and wide market prospect.

The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are intended to be included within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.