Vanadium-titanium pellet roasting control process

Abstract

The application discloses a kind of vanadium-titanium pellet roasting control processes, the vanadium-titanium pellet roasting control processes include the following steps: step 1: raw material, binder and additive are proportioned according to certain proportion;Step 2: using roller press material;Step 3: balling machine material is made into pellet: step 4: by chain grate to vanadium-titanium pellet is dried and preheated;Step 5: using rotary kiln calcination, using filter device to waste gas is treated;Step 6: using ring cooling machine cooling;Step 7: vanadium-titanium pellet enters finished product bin.Proportioning includes 3-50% vanadium-titanium iron concentrate, 5-45% ordinary iron concentrate, 5%-8% SiO2, 2%-4% MgO, 2-5% binder, 0.2-0.45% S and H2O.The vanadium-titanium pellet roasting control process, compared with vanadium-titanium pellet roasting control process, improve the balling performance, increase green ball strength, increase the compressive strength, production is increased, avoid in production process will emit toxic and harmful waste gas.

Description

Technical Field

[0001] This invention relates to the field of vanadium-titanium pellet technology, specifically to a vanadium-titanium pellet roasting control process. Background Technology

[0002] Vanadium and titanium, as rare metals, have a wide range of applications. Vanadium-titanium pellets are a type of man-made mineral, generally used as iron raw materials for blast furnace smelting, blast furnace lining materials, and gas-based vertical shaft furnace reduction materials. Carbon-containing pellets are used as raw materials for coal-based direct reduction. The structure of blast furnace smelting materials is basically high-basicity sintered ore mixed with a certain proportion of acidic oxide pellets. Due to the special characteristics of vanadium-titanium iron concentrate in blast furnace smelting, vanadium-titanium iron concentrate is more suitable for producing pellets. The preparation of acidic oxide pellets is an important utilization method in blast furnace smelting. In order to avoid serious accidents in the blast furnace hearth, the longevity and safety of the hearth have received high attention from metallurgists. The decisive factors for maintaining the longevity of the blast furnace are mainly blast furnace operation and titanium lining materials, and acidic oxide pellets can meet the requirements of lining materials.

[0003] However, the green pellets produced by conventional vanadium-titanium pellet roasting control processes have insufficient strength and compressive strength. Affected by external factors, the strength indicators of green pellets are poor, and the yield is also low. During the production process, a large amount of toxic and harmful waste gas is emitted, which contains hydrogen chloride, sulfur dioxide and sulfuric acid, and has a devastating impact on vegetation and crops. Therefore, we propose a vanadium-titanium pellet roasting control process to solve the problems mentioned above. Summary of the Invention

[0004] The purpose of this invention is to provide a vanadium-titanium pellet roasting control process to solve the problems mentioned in the background art, such as the low strength and compressive strength of the green pellets produced by the current vanadium-titanium pellet roasting control process, the poor strength index of the green pellets due to external factors, the low yield, and the emission of a large amount of toxic and harmful waste gas containing hydrogen chloride, sulfur dioxide and sulfuric acid during the production process, which has a devastating impact on vegetation and crops.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a vanadium-titanium pellet roasting control process, the vanadium-titanium pellet roasting control process comprising the following steps:

[0006] Step 1: Mix the mineral materials, binder, and additives in a certain proportion;

[0007] Step 2: Use a roller press to press the material;

[0008] Step 3: The pelletizing machine forms the material into pellets:

[0009] Step 4: Dry and preheat the vanadium-titanium pellets using a chain grate machine;

[0010] Step 5: Calcinate the vanadium-titanium pellets using a rotary kiln and treat the waste gas using a filtration device;

[0011] Step 6: Cool using an annular cooler;

[0012] Step 7: Vanadium-titanium pellets enter the finished product silo.

[0013] Preferably, the ingredients in step 1 include 3-50% vanadium-titanium iron concentrate, 5-45% ordinary iron concentrate, 5%-8% SiO2, 2%-4% MgO, 2-5% binder, and 0.2-0.45% S and H2O.

[0014] Preferably, in step 2, a drum screen with a screen surface length of 2000mm is added to the roller press to remove impurities from the refined powder. The impurities are transported separately, and then the remaining material is roller pressed.

[0015] Preferably, in step 3, the tilt angle of the ball-forming machine is increased to 55-65°, the rotation speed is increased to 50-65 r / min, the position and interval of the water addition point and the feeding point are adjusted, and the ball-forming machine is formed after rotating for 5 minutes.

[0016] Preferably, the chain grate machine in step 4 is preheated in three stages: the first preheating stage has a temperature of 400°C, the second preheating stage has a temperature of 700°C, and the third preheating stage has a temperature of 1000°C.

[0017] Preferably, the rotary kiln firing temperature in step 5 is 1150-1200℃, and the rotary kiln rotation speed is 0.9-1.1 r / m.

[0018] Preferably, the filter in step 5 contains clear limewater. When the exhaust gas passes through the filter, it reacts with the limewater, and the CO2 in the exhaust gas is separated out.

[0019] Preferably, the air volume of the annular cooler in step 6 is controlled at 90,000 to 100,000 m³ / s. 3 / h.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the vanadium-titanium pellet roasting control process improves pelletizing performance, increases green pellet strength, increases compressive strength, increases output, and avoids the emission of toxic and harmful waste gases during the production process. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides the following technical solution: a vanadium-titanium pellet roasting control process, which includes the following steps:

[0023] Step 1: Mix the mineral materials, binder, and additives in a certain proportion;

[0024] Step 2: Use a roller press to press the material;

[0025] Step 3: The pelletizing machine forms the material into pellets:

[0026] Step 4: Dry and preheat the vanadium-titanium pellets using a chain grate machine;

[0027] Step 5: Calcinate the vanadium-titanium pellets using a rotary kiln and treat the waste gas using a filtration device;

[0028] Step 6: Cool using an annular cooler;

[0029] Step 7: Vanadium-titanium pellets enter the finished product silo.

[0030] As a key technical feature of this solution, the ingredients in step 1 include 3-50% vanadium-titanium iron concentrate, 5-45% ordinary iron concentrate, 5%-8% SiO2, 2%-4% MgO, 2-5% binder, and 0.2-0.45% S and H2O.

[0031] As a key technical feature of this solution, a 2000mm long drum screen is added to the roller press in step 2 to remove impurities from the refined powder. The impurities are transported separately, and then the remaining material is roller-pressed.

[0032] As a key technical feature of this solution, in step 3, the tilt angle of the ball-forming machine is increased to 55-65°, the rotation speed is increased to 50-65 r / min, the position and interval of the water addition point and the feeding point are adjusted, and the ball-forming machine is formed after rotating for 5 minutes.

[0033] As a key technical feature of this solution, the chain grate machine in step 4 is divided into three preheating stages: the first preheating stage has a temperature of 400°C, the second preheating stage has a temperature of 700°C, and the third preheating stage has a temperature of 1000°C.

[0034] As a key technical feature of this solution, the rotary kiln firing temperature in step 5 is 1150–1200°C, and the rotary kiln rotation speed is 0.9–1.1 r / m.

[0035] As a key technical feature of this solution, the filter device in step 5 contains clear lime water. When the exhaust gas passes through the filter device, it reacts with the lime water, and the CO2 in the exhaust gas is separated out.

[0036] As a key technical feature of this solution, the airflow of the annular cooler in step 6 is controlled at 90,000 to 100,000 m³ / h. 3 / h.

[0037] Example 1:

[0038] Vanadium-titanium iron concentrate, ordinary iron concentrate, and binder are mixed in proportion and roasted in a rotary kiln using air oxidation. The reactants react with each other to remove combustibles. Carbon dioxide reacts with clear limewater to form a precipitate. The carbon dioxide is then filtered to clarify it. The chemical reaction equation is CO2 + Ca(OH)2 = CaCO3↓ + H2O.

[0039] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A vanadium-titanium pellet roasting control process, characterized in that: The vanadium-titanium pellet roasting control process includes the following steps: Step 1: Mix the mineral materials, binder, and additives in a certain proportion; Step 2: Crush the material using a roller press; Step 3: The pelletizing machine forms the material into pellets: Step 4: Dry and preheat the vanadium-titanium pellets using a chain grate machine; Step 5: Calcinate the vanadium-titanium pellets using a rotary kiln and treat the waste gas using a filtration device; Step 6: Cool using an annular cooler; Step 7: Vanadium-titanium pellets enter the finished product silo; In step 2, a 2000mm long drum screen is added to the roller press to remove impurities from the refined powder. The impurities are transported separately, and then the remaining material is roller-pressed. In step 3, the tilt angle of the pelletizing disc of the pelletizing machine is increased to 55-65°, the rotation speed is increased to 50-65 r / min, and the position and interval of the water addition point and the feeding point are adjusted. After the pelletizing machine rotates for 5 minutes, pellets are formed. The chain grate machine in step 4 is divided into three preheating stages: the first preheating stage has a temperature of 400°C, the second preheating stage has a temperature of 700°C, and the third preheating stage has a temperature of 1000°C.

2. The vanadium-titanium pellet roasting control process according to claim 1, characterized in that: The ingredients in step 1 include 3-50% vanadium-titanium iron concentrate, 5-45% ordinary iron concentrate, 5%-8% SiO2, 2%-4% MgO, 2-5% binder, and 0.2-0.45% S and H2O.

3. The vanadium-titanium pellet roasting control process according to claim 1, characterized in that: The rotary kiln firing temperature in step 5 is 1150–1200℃, and the rotary kiln rotation speed is 0.9–1.1 r / m.

4. The vanadium-titanium pellet roasting control process according to claim 1, characterized in that: The filter in step 5 contains clear limewater. When the exhaust gas passes through the filter, it reacts with the limewater, and the CO2 in the exhaust gas is separated out.

5. The vanadium-titanium pellet roasting control process according to claim 1, characterized in that: In step 6, the air volume of the annular cooler is controlled at 90,000 to 100,000 m³ / h. 3 / h.