Pyrite smelting device

Abstract

The utility model discloses a pyrite smelting device and belongs to the technical field of metallurgy and coal chemical industry. The pyrite smelting device comprises a sulfur extraction unit and a gasification smelting unit, and the sulfur extraction unit comprises an ore storage tank, a star-shaped feeder, a circulating fluidized bed, a cyclone separator, a return valve, a sulfuric acid preparation reactor and a star-shaped discharger; and the gasification smelting unit comprises a conveying tank and a gasification ironmaking furnace.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgy and coal chemical industry, and specifically relates to a pyrite smelting device. Background Art

[0002] Pyrite is a major ore resource, the main components of which are sulfur and iron. It is mainly used to make sulfur and sulfuric acid. The utilization rate of the by-product iron oxide is low, resulting in the loss and waste of iron resources.

[0003] Patent CN1752229A discloses a pyrite smelting process, adding "active M" to make balls, and adopting the "powder spraying and burning method" to extract sulfur. Patent CN102586618A discloses a pyrite smelting process, adopting pyrite molten pool oxidation smelting technology; Patent CN114277208A discloses a pyrite suspended flash smelting device and method, which adopts a three-furnace smelting device including a suspended oxidation smelting furnace, a reduction smelting molten pool and a flue gas treatment device. The above technologies have the disadvantages of complex processes, high energy consumption and low resource utilization. Utility Model Content

[0004] Aiming at the problems of complex pyrite smelting process, high energy consumption and low resource utilization, the utility model provides a

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A pyrite smelting device comprises a sulfur extraction unit and a gasification smelting unit, wherein the sulfur extraction unit comprises an ore storage tank, a star-shaped feeder, a circulating fluidized bed, a cyclone separator, a return valve, a sulfuric acid reactor and a star-shaped discharger;

[0007] The ore storage tank is connected to the circulating fluidized bed through a star-shaped feeder, an air inlet and a discharge port are provided at the bottom of the circulating fluidized bed, the discharge port is connected to the star-shaped discharger, the outlet of the star-shaped discharger is connected to the gasification ironmaking furnace, and the material discharged by the star-shaped discharger is sent to the gasification ironmaking furnace through blowing gas; the top outlet of the circulating fluidized bed is connected to the cyclone separator, the top outlet of the cyclone separator is connected to the sulfuric acid reactor, and the bottom outlet is connected to the middle and lower part of the circulating fluidized bed through a return valve; the oxidant is connected to the bottom air inlet of the circulating fluidized bed and the bottom air inlet of the return valve respectively;

[0008] The gasification smelting unit includes a conveying tank and a gasification iron-making furnace; the gasification iron-making furnace includes a gasification section, a molten pool section and a reducing section; a nozzle is provided at the top of the gasification section, and a plurality of ore powder inlets are provided in the middle and upper part; the molten pool section is provided with a synthesis gas outlet, a coal powder inlet, a slag discharge port and a molten iron outlet; the reducing section is provided with a plurality of oxygen inlets; the conveying tank is connected to the nozzle and the coal powder inlet of the gasification iron-making furnace; the oxygen is divided into two paths, which are respectively connected to the nozzle and the oxygen inlet.

[0009] Furthermore, the ore powder inlet is vertically arranged to the gasification ironmaking furnace, evenly distributed along the circumference, and the number is 2 to 8.

[0010] Furthermore, the setting height of the mineral powder inlet is H from the top, the inner diameter of the gasification section is D, and H:D is 0.1~2.

[0011] Furthermore, the oxygen inlet is evenly distributed along the circumference, the number is greater than 2, and the angle α between the oxygen inlet and the axial direction of the gasification ironmaking furnace is 0~50°.

[0012] Furthermore, the pulverized coal inlets are evenly distributed along the circumference, the number is 2 to 8, and the angle β between the pulverized coal inlets and the axial direction of the gasification ironmaking furnace is 50 to 90 degrees.

[0013] A pyrite smelting method of a pyrite smelting device, comprising the following steps:

[0014] Step 1, introducing fuel and air into a circulating fluidized bed and a gasification ironmaking furnace to ignite and bake the furnace;

[0015] Step 2, when the temperature of the gasification ironmaking furnace is greater than 1300° C., the supply of fuel and air is stopped, the pulverized coal is transported to the gasification ironmaking furnace by conveying gas, oxygen is introduced from the top nozzle and the oxygen inlet to react with the pulverized coal in the gasification ironmaking furnace to produce reducing gas;

[0016] Step 3, when the temperature of the circulating fluidized bed is greater than 850° C., the fuel supply is stopped, the pyrite 1 is fed into the circulating fluidized bed using a star feeder, and then an oxidant is introduced to carry out a combustion reaction;

[0017] Step 4: The gas generated by the circulating fluidized bed carries the mineral powder into the cyclone separator, the gas rich in SO2 enters the sulfuric acid reactor, and the solid mineral powder discharged from the lower part of the cyclone separator returns to the circulating fluidized bed through the return valve;

[0018] Step 5, the iron oxides discharged from the lower discharge port of the circulating fluidized bed are discharged through a star-shaped discharger and transported to the ore powder inlet of the gasification ironmaking furnace by blowing gas. In the gasification section of the gasification ironmaking furnace, the iron oxides react with the coal powder and the reducing gas, and most of them are reduced to iron;

[0019] Step 6, unreacted carbon and unreduced iron oxides enter the molten pool section, oxygen and pulverized coal undergo combustion and gasification reaction to maintain the temperature of the molten pool section, and unreduced iron oxides and unconverted residual carbon in the pulverized coal further react to generate iron and synthesis gas;

[0020] Step 7, the synthesis gas produced by the gasification ironmaking furnace is discharged from the boundary area, and after the ash and molten iron are separated by sedimentation, the ash is discharged from the boundary area from the slag discharge port, and the molten iron is discharged from the molten iron outlet and sent to steelmaking.

[0021] Furthermore, the weight ratio of the pyrite to the coal powder is 1-2:1, and the volume weight ratio of the oxygen to the coal powder is 0.4-1.0 Nm 3 / kg.

[0022] Furthermore, the amount of coal powder in the nozzle: the amount of coal powder in the molten pool section = 1~10; the amount of oxygen in the nozzle: the amount of oxygen in the reducing section = 2~10.

[0023] Furthermore, the reaction temperature of the circulating fluidized bed is 900°C to 1100°C, the temperature of the gasification section and the molten pool section of the gasification ironmaking furnace is 1300°C to 1600°C; the temperature of the iron oxide discharged from the circulating fluidized bed is 800°C to 1000°C.

[0024] Furthermore, the reducing gas includes CO and H2; the effective component CO+H2 in the synthesis gas is greater than 60%; the oxidant is oxygen or air; the blowing gas is air or CO2; and the conveying gas is nitrogen or CO2.

[0025] Compared with the prior art, the utility model has the following advantages:

[0026] 1) Produce sulfuric acid and iron through the oxidation reaction of sulfur in pyrite and the reduction reaction of iron, thereby improving resource utilization efficiency;

[0027] 2) The circulating fluidized bed sulfur oxidation reaction is used to produce SO2 and preheat the iron oxides at the same time, which reduces the energy consumption of the subsequent iron oxide reduction process, realizes the heat coupling of oxidation exothermic-gasification reduction endothermic, and reduces the overall process energy consumption.

[0028] 3) Simplify the acid-making-gasification-ironmaking process, realize the simultaneous acid-making and iron-making, improve operation stability, reduce product costs, and reduce CO2 emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the pyrite smelting device of the present invention.

[0030] In the figure: 1. pyrite; 2. ore storage tank; 3. star feeder; 4. circulating fluidized bed; 5. oxidant; 6. star discharger; 7. blowing gas; 8. cyclone separator; 9. return valve; 10. sulfuric acid reactor; 11. coal powder; 12. conveying tank; 13. conveying gas; 14. oxygen; 15. gasification ironmaking furnace; 15-1. gasification section; 15-2. molten pool section; 15-3. reducing section; 15-4. nozzle; 15-5. ore powder inlet; 15-6. oxygen inlet; 15-7. synthesis gas outlet; 15-8. coal powder inlet; 15-9. slag outlet; 15-10. molten iron outlet. DETAILED DESCRIPTION

[0031] In order to further illustrate the technical solution of the present utility model, the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0032] like Figure 1 As shown, a pyrite smelting device includes a sulfur extraction unit and a gasification smelting unit, wherein the sulfur extraction unit includes an ore storage tank 2, a star-shaped feeder 3, a circulating fluidized bed 4, a cyclone separator 8, a return valve 9, a sulfuric acid reactor 10 and a star-shaped discharger 6;

[0033] The ore storage tank 2 is connected to the circulating fluidized bed 4 through a star-shaped feeder 3. An air inlet and a discharge port are provided at the bottom of the circulating fluidized bed 4. The discharge port is connected to the star-shaped discharger 6. The outlet of the star-shaped discharger 6 is connected to the gasification ironmaking furnace 15. The material discharged from the star-shaped discharger 6 is sent to the gasification ironmaking furnace 15 through a blower; the top outlet of the circulating fluidized bed 4 is connected to the cyclone separator 8. The top outlet of the cyclone separator 8 is connected to the sulfuric acid reactor 10, and the bottom outlet is connected to the middle and lower part of the circulating fluidized bed 4 through a return valve 9; the oxidant 5 is respectively connected to the bottom air inlet of the circulating fluidized bed 4 and the bottom air inlet of the return valve 9;

[0034] The gasification smelting unit includes a conveying tank 12 and a gasification iron-making furnace 15; the gasification iron-making furnace 15 includes a gasification section 15-1, a molten pool section 15-2 and a reducing section 15-3; the gasification section 15-1 is provided with a nozzle 15-4 at the top, and a plurality of mineral powder inlets 15-5 in the middle and upper part; the molten pool section 15-2 is provided with a synthesis gas outlet 15-7, a coal powder inlet 15-8, a slag discharge port 15-9 and a molten iron outlet 15-10; the reducing section 15-3 is provided with a plurality of oxygen inlets 15-6; the conveying tank 12 is connected to the nozzle 15-4 and the coal powder inlet 15-8 of the gasification iron-making furnace 15; the oxygen 14 is divided into two paths, which are respectively connected to the nozzle 15-4 and the oxygen inlet 15-6.

[0035] Furthermore, the ore powder inlet 15-5 is vertically arranged to the gasification ironmaking furnace 15, evenly distributed along the circumference, and the number is 2 to 8.

[0036] Furthermore, the setting height of the mineral powder inlet 15-5 and the distance from the top are H, the inner diameter of the gasification section 15-1 is D, and H:D is 0.1~2.

[0037] Furthermore, the oxygen inlet 15-6 is evenly distributed along the circumference, the number is greater than 2, and the angle α with the axial direction of the gasification ironmaking furnace 15 is 0-50°. The oxygen inlet in the molten pool is located above the slag liquid surface. Main function 1: oxygen reacts with synthesis gas to generate heat; main function 2: stir the slag and bring the heat generated by the reaction of oxygen and synthesis gas into the slag in the form of gas. If the angle α is too large, the above two purposes cannot be achieved.

[0038] Furthermore, the pulverized coal inlet 15-8 is evenly distributed along the circumference, the number is 2 to 8, and the angle β with the axial direction of the gasification ironmaking furnace 15 is 50 to 90 degrees. The pulverized coal inlet in the molten pool is located below the slag liquid surface. Main function 1: pulverized coal reacts with iron ore powder to produce elemental iron; Main function 2: The conveying gas carries the pulverized coal into the slag at a certain speed, plays a stirring role, makes the slag temperature more uniform, and uses the iron ore powder to reduce to elemental iron. If the angle α is too small, the above two purposes cannot be achieved.

[0039] A pyrite smelting method of a pyrite smelting device, comprising the following steps:

[0040] Step 1, introducing fuel and air into the circulating fluidized bed 4 and the gasification ironmaking furnace 15, and igniting and baking the furnace;

[0041] Step 2, when the temperature of the gasification ironmaking furnace 15 is greater than 1300° C., the supply of fuel and air is stopped, the pulverized coal 11 is transported to the gasification ironmaking furnace 15 by the transport gas 13, and oxygen 14 is introduced from the top nozzle 15-4 and the oxygen inlet 15-6 to react with the pulverized coal 11 in the gasification ironmaking furnace 15 to produce reducing gas;

[0042] Step 3, when the temperature of the circulating fluidized bed 4 is greater than 850° C., the fuel supply is stopped, the pyrite 1 is fed into the circulating fluidized bed 4 using a star feeder 3, and then an oxidant 5 is introduced to carry out a combustion reaction;

[0043] Step 4, the gas generated by the circulating fluidized bed 4 carries the mineral powder into the cyclone separator 8, the gas rich in SO2 enters the sulfuric acid reactor 10, and the solid mineral powder discharged from the lower part of the cyclone separator 8 returns to the circulating fluidized bed 4 through the return valve 9;

[0044] Step 5, the iron oxides discharged from the lower discharge port of the circulating fluidized bed 4 are discharged through the star-shaped discharger 6, and transported to the ore powder inlet 15-5 of the gasification ironmaking furnace 15 through the blowing gas 7. The iron oxides in the gasification section 15-1 of the gasification ironmaking furnace 15 react with the coal powder 11 and the reducing gas, and most of them are reduced to iron;

[0045] Step 6, unreacted carbon and unreduced iron oxides enter the molten pool section 15-2, oxygen 14 and coal powder 11 undergo combustion and gasification reaction to maintain the temperature of the molten pool section 15-5, and unreduced iron oxides and unconverted residual carbon of the coal powder further react to generate iron and synthesis gas;

[0046] Step 7, the synthesis gas produced by the gasification ironmaking furnace 15 is discharged from the boundary area, and after the ash and molten iron are separated by sedimentation, the ash is discharged from the boundary area from the slag discharge port 15-9, and the molten iron is discharged from the molten iron port 15-10 and sent to steelmaking.

[0047] Furthermore, the weight ratio of the pyrite 1 to the coal powder 11 is 1-2:1, and the volume weight ratio of the oxygen to the coal powder 11 is 0.4-1.0 Nm 3 / kg.

[0048] Furthermore, the amount of coal powder in nozzle 15-4: the amount of coal powder in molten pool section 15-2 = 1~10; the amount of oxygen in nozzle 15-4: the amount of oxygen in reducing section 15-3 = 2~10.

[0049] Furthermore, the reaction temperature of the circulating fluidized bed 4 is 900°C to 1100°C, the temperature of the gasification section 15-1 and the molten pool section 15-2 of the gasification ironmaking furnace 15 is 1300°C to 1600°C; the temperature of the iron oxide discharged from the circulating fluidized bed 4 is 800°C to 1000°C.

[0050] Furthermore, the reducing gas includes CO and H2; the effective component CO+H2 in the synthesis gas is greater than 60%; the oxidant 5 is oxygen or air; the blowing gas 7 is air or CO2; and the conveying gas 13 is nitrogen or CO2.

[0051] The above-mentioned method of simultaneous acid and ironmaking using pyrite is described in detail below through a specific implementation process.

[0052] Example 1

[0053] The oxidant 5 is air, the blowing gas 7 is air, and the conveying gas 13 is nitrogen. The number of the ore powder inlet 15-5 is 3. The height of the ore powder inlet 15-5 is H: the inner diameter of the gasification section 15-1 is D is 0.5. The number of the oxygen inlet 15-6 is 4, and the angle α is 10°. The number of the coal powder inlet 15-8 is 4, and the angle β is 50°. The weight ratio of pyrite 1 to coal powder 11 is 1.1, and the ratio of oxygen 15-6 to coal powder 11 is 0.5Nm 3 / kg. Coal powder amount in nozzle 15-4: coal powder amount in molten pool section 15-2 = 3. Oxygen amount in nozzle 15-4: oxygen amount in reducer section 15-3 = 5. The reaction temperature of the circulating fluidized bed 4 is 900°C, and the temperature of the gasification section 15-1 of the gasification ironmaking furnace 15 is 1300°C. The temperature of the molten pool section 15-2 of the gasification ironmaking furnace 15 is 1500°C. The volume content of SO2 in the gas discharged from the cyclone separator is 18%, the iron content in the molten iron is 92%, the volume content of the effective components CO+H2 in the synthesis gas is 65%, the iron reduction rate is 92%, and the carbon conversion rate is 98.5%.

[0054] Example 2

[0055] The oxidant 5 is air, the blowing gas 7 is air, and the conveying gas 13 is CO2. The number of the ore powder inlet 15-5 is 4. The height of the ore powder inlet 15-5 is H: the inner diameter of the gasification section 15-1 is D is 1. The number of the oxygen inlet 15-6 is 3, and the angle α is 20°. The number of the coal powder inlet 15-8 is 6, and the angle β is 70°. The weight ratio of pyrite 1 to coal powder 11 is 1.5, and the ratio of oxygen 15-6 to coal powder 11 is 0.7Nm 3 / kg. Coal powder amount in nozzle 15-4: coal powder amount in molten pool section 15-2 = 5. Oxygen amount in nozzle 15-4: oxygen amount in reducer section 15-3 = 5. The reaction temperature of the circulating fluidized bed 4 is 1000°C, and the temperature of the gasification section 15-1 of the gasification ironmaking furnace 15 is 1400°C. The temperature of the molten pool section 15-2 of the gasification ironmaking furnace 15 is 1400°C. The volume content of SO2 in the gas discharged from the cyclone separator is 20%, the iron content in the molten iron is 93%, the volume content of the effective components CO+H2 in the synthesis gas is 68%, the iron reduction rate is 94%, and the carbon conversion rate is 99.0%.

[0056] Example 3

[0057] The oxidant 5 is oxygen, the blowing gas 7 is CO2, and the conveying gas 13 is nitrogen. The number of the ore powder inlet 15-5 is 8. The height of the ore powder inlet 15-5 is H: the inner diameter of the gasification section 15-1 is D is 1.2. The number of the oxygen inlet 15-6 is 6, and the angle α is 30°. The number of the coal powder inlet 15-8 is 4, and the angle β is 60°. The weight ratio of pyrite 1 to coal powder 11 is 1.6, and the ratio of oxygen 15-6 to coal powder 11 is 0.8Nm 3 / kg. Coal powder amount in nozzle 15-4: coal powder amount in molten pool section 15-2 = 8. Oxygen amount in nozzle 15-4: oxygen amount in reducer section 15-3 = 8. The reaction temperature of the circulating fluidized bed 4 is 1100°C, and the temperature of the gasification section 15-1 of the gasification ironmaking furnace 15 is 1500°C. The temperature of the molten pool section 15-2 of the gasification ironmaking furnace 15 is 1550°C. The volume content of SO2 in the gas discharged from the cyclone separator is 80%, the content of iron in the molten iron is 94%, the volume content of the effective components CO+H2 in the synthesis gas is 63%, the iron reduction rate is 94%, and the carbon conversion rate is 98.0%.

[0058] Example 4

[0059] The oxidant 5 is oxygen, the blowing gas 7 is CO2, and the conveying gas 13 is CO2. The number of the ore powder inlet 15-5 is 6. The height of the ore powder inlet 15-5 is H: the inner diameter of the gasification section 15-1 is D is 2. The number of the oxygen inlet 15-6 is 8, and the angle α is 50°. The number of the coal powder inlet 15-8 is 8, and the angle β is 80°. The weight ratio of pyrite 1 to coal powder 11 is 2, and the ratio of oxygen 15-6 to coal powder 11 is 0.9Nm 3 / kg. Coal powder amount in nozzle 15-4: coal powder amount in molten pool section 15-2 = 10. Oxygen amount in nozzle 15-4: oxygen amount in diameter reducing section 15-3 = 10. The reaction temperature of the circulating fluidized bed 4 is 1100°C, and the temperature of the gasification section 15-1 of the gasification ironmaking furnace 15 is 1600°C. The temperature of the molten pool section 15-2 of the gasification ironmaking furnace 15 is 1600°C. The volume content of SO2 in the gas discharged from the cyclone separator is 85%, the content of iron in the molten iron is 95%, the volume content of the effective components CO+H2 in the synthesis gas is 61%, the iron reduction rate is 95%, and the carbon conversion rate is 99.5%.

[0060] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0061] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A pyrite smelting device, characterized in that: Including sulfur extraction unit and gasification smelting unit, The sulfur extraction unit comprises a ore storage tank (2), a star-shaped feeder (3), a circulating fluidized bed (4), a cyclone separator (8), a return valve (9), a sulfuric acid production reactor (10) and a star-shaped discharger (6); The ore storage tank (2) is connected to the circulating fluidized bed (4) via a star-shaped feeder (3); an air inlet and a discharge port are provided at the bottom of the circulating fluidized bed (4); the discharge port is connected to the star-shaped discharger (6); the outlet of the star-shaped discharger (6) is connected to the gasification ironmaking furnace (15); the material discharged from the star-shaped discharger (6) is sent to the gasification ironmaking furnace (15) via a blowing gas (7); the top outlet of the circulating fluidized bed (4) is connected to a cyclone separator (8); the top outlet of the cyclone separator (8) is connected to a sulfuric acid production reactor (10); the bottom outlet is connected to the middle and lower part of the circulating fluidized bed (4) via a return valve (9); the oxidant (5) is respectively connected to the bottom air inlet of the circulating fluidized bed (4) and the bottom air inlet of the return valve (9); The gasification smelting unit comprises a conveying tank (12) and a gasification ironmaking furnace (15); the gasification ironmaking furnace (15) comprises a gasification section (15-1), a molten pool section (15-2) and a diameter reducing section (15-3); the top of the gasification section (15-1) is provided with a nozzle (15-4), and the middle and upper part is provided with a plurality of ore powder inlets (15-5); the molten pool section (15-2) is provided with a synthesis gas outlet (15-7), a coal powder inlet (15-8), a slag outlet (15-9) and a molten iron outlet (15-10); the diameter reducing section (15-3) is provided with a plurality of oxygen inlets (15-6); the conveying tank (12) is connected to the nozzle (15-4) and the coal powder inlet (15-8) of the gasification ironmaking furnace (15); the oxygen (14) is divided into two paths, which are respectively connected to the nozzle (15-4) and the oxygen inlet (15-6); The ore powder inlet (15-5) is vertically arranged with respect to the gasification ironmaking furnace (15), evenly distributed along the circumference, and the number thereof is 2 to 8; The setting height of the mineral powder inlet (15-5) and the distance from the top are H, the inner diameter of the gasification section (15-1) is D, and H:D is 0.1~2.

2. A pyrite smelting device according to claim 1, characterized in that: The oxygen inlets (15-6) are evenly distributed along the circumference, the number of which is greater than 2, and the angle α between the oxygen inlet and the axial direction of the gasification ironmaking furnace (15) is 0-50°.

3. A pyrite smelting device according to claim 1, characterized in that: The pulverized coal inlets (15-8) are evenly distributed along the circumference, the number is 2 to 8, and the angle β between the axial direction of the gasification ironmaking furnace (15) is 50 to 90 degrees.

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