Method for discharging slag and iron at single iron notch of iron-making blast furnace

Abstract

The invention provides a single-taphole slag iron discharging method of an iron-making blast furnace. The method comprises the following steps: 1) confirming equipment facilities; 2) tapping an iron notch: a tapping machine uses a 45mm drill bit for tapping, the depth of the iron notch is 2.6-2.8 m, the mud beating amount is 1.8-2.0 grids, in the tapping process, if the situation that slag and iron are held up in the furnace due to coke jamming occurs, the tapping machine immediately blocks the notch and withdraws a gun, the tapping machine uses a 50mm drill bit for tapping to 1.5 m, and then the 45mm drill bit is used for tapping; 3) tapping: strictly controlling the tapping time to be more than 70-90 minutes to ensure that slag iron in the furnace is completely discharged; and 4) iron notch plugging: checking a daily maintenance scheme of single-iron notch production equipment, and finishing the inspection work of a tapping machine, a clay gun machine, a swing chute nozzle and a hydraulic valve stand 5 minutes before iron notch drilling. And under the condition that only one iron notch is available, the daily tapping amount of the single iron notch is realized through a standardized production operation system and an equipment maintenance system, the tapping amount of the blast furnace is maintained, and the stable furnace condition is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy and relates to a method for discharging slag and iron from a single taphole of an iron-making blast furnace. Background Art

[0002] In order to ensure the stability of production, modern iron-making blast furnaces are basically equipped with more than two tapholes. This is because when the iron outlet ditch of one taphole needs to be repaired or relined, at least one taphole can be used normally, thereby maintaining the normal production of the blast furnace. Considering production demand, investment cost, construction time, site size and other factors, most small blast furnaces are currently equipped with only two tapholes. However, for the existing 1080m 3 It is just a small blast furnace. Usually, only two tapholes can tap iron alternately without interval to give full play to the production potential of this type of blast furnace, so that the daily iron output of the blast furnace can reach more than 4,000 tons. If any of the tapholes is closed for maintenance, it will greatly limit the production capacity of the blast furnace, resulting in a significant reduction in iron output and frequent fluctuations in furnace conditions. So, when only one taphole is available, how can the iron output of the blast furnace be maximized? Summary of the invention

[0003] The present invention aims to provide a method for discharging slag from a single taphole of an ironmaking blast furnace, which can effectively maintain the single taphole system in a relatively short time to ensure long-term, high-load and stable operation of the blast furnace.

[0004] The technical solution of the present invention: A method for discharging slag from a single taphole of an ironmaking blast furnace comprises the following steps: 1) Confirmation of equipment and facilities: Check that the opening machine, mud gun machine, swinging spout, iron outlet ditch, mud sleeve and taphole mud are in place and function normally.

[0005] 2) Opening the iron mouth: The opening machine uses a 45mm drill bit to open the hole. The iron mouth depth should be maintained at 2.8~3.0m as much as possible, and the mud volume should be 1.8~2.0 grids, subject to the iron mouth being free from moisture. In the process of opening the hole, if the furnace is blocked by coke, the hole should be blocked immediately and the blasting should be withdrawn. The opening machine uses a 50mm drill bit to open the hole to 1.5m, and then uses a 45mm drill bit to open the hole.

[0006] 3) Iron tapping: The iron tapping time is strictly controlled within 70 to 90 minutes to ensure that the slag and iron in the furnace are discharged cleanly.

[0007] 4) Blocking the taphole: Check the daily maintenance plan for single taphole production equipment, and complete the inspection of the taphole opening machine, mud gun machine, swing spout, and hydraulic valve station 5 minutes before taphole opening.

[0008] Beneficial effects of the invention: The invention proposes a method for discharging slag from a single ironmouth of an iron-making blast furnace. Under the condition that only one ironmouth is available, the goal of producing 4,000 tons of iron per day from a single ironmouth is achieved through a standardized production operation system and equipment maintenance system, which not only maintains the iron output of the blast furnace, but also ensures a stable furnace condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the flow chart of slag and iron discharge from a single iron mouth. DETAILED DESCRIPTION

[0010] A method for discharging slag from a single taphole of an ironmaking blast furnace comprises the following steps: 1) Confirmation of equipment and facilities, check the following aspects: (1) The opener is normal: check and confirm that the chain is normal, there is no jamming in the front and rear of the trolley; there is no leakage in the water jacket, atomizing water pipe, oil pipe, and compressed air pipe; there is no burning or deformation of the slag baffle, drill rod positioning clamp, and towing hook; the impact and rotation of the rock drill are normal; (2) The mud gun machine is normal: confirm that the gun barrel and the engine head are free of scale and the mud is full; the oil pipe is not leaking and the pressure is normal; the rotating equipment has no cracks or screws falling off; the gun cap is not burned or deformed; (3) The swinging nozzle is normal: confirm that there is no "beard" under the swinging nozzle; the reducer is normal, the current is normal; manual swinging is not strenuous; (4) The iron outlet groove is normal: carefully check the slag groove, iron groove, slag groove and groove head to confirm that there is no obvious wear or cracks inside; (5) The mud sleeve is normal: the mud sleeve protection plate is clean, the surrounding area of ​​the mud sleeve is clean, and there is no slag under the mud sleeve to ensure that the plugging port does not leak mud; (6) Iron mouth mud is in place: Confirm that the single iron mouth mud under the furnace table is ready.

[0011] 2) Opening the iron mouth: The opening machine uses a 45mm drill bit to open the hole. The iron mouth depth should be maintained at 2.8m as much as possible, and the mud volume should be 1.8~2.0 grids, subject to the iron mouth being free from moisture. In the process of opening the hole, if the furnace is blocked by coke, the hole should be blocked immediately and the blasting should be withdrawn. The opening machine uses a 50mm drill bit to open the hole to 1.5m, and then uses a 45mm drill bit to open the hole.

[0012] 3) Iron tapping: The iron tapping time is strictly controlled within 70 to 90 minutes to ensure that the slag and iron in the furnace are discharged cleanly.

[0013] 4) Blocking the taphole: Use a specific single taphole mud to block the taphole. This taphole mud has the characteristics of fast sintering, high strength, and erosion resistance. The amount of mud produced by the taphole mud machine is controlled at 60~80kg, and the mud pressure is controlled at about 18MPa. In order to ensure that the taphole mud is sintered quickly and the taphole is not damp, the taphole depth is controlled at 2.6~2.8m.

[0014] The daily maintenance system of single iron mouth equipment mainly includes the following contents: 1) Opening machine: the base bolts are not loose, and the rib plate welds are not cracked; the slewing mechanism is lubricated normally, the connecting bolts are not loose, and the pin wear is less than 2mm; the walking rail beam has no bending deformation, the wear is less than 2mm, the connecting bolts of each part are not loose, and the welds are not cracked; the transmission chain is not burned or deformed, the lubrication is normal, and the clips are not loose; the fixing bolts of the rock drill base are not loose, the machine body has no oil leakage or abnormal sound, the high pressure of the accumulator is 6.0~6.5MPa, and the low pressure is 0.8~1.2MPa; the hydraulic cylinder piston rod has no obvious wear, the pin has no wear, the joint bearing / sleeve has no wear, and the seal has no leakage.

[0015] 2) Mud cannon: The base bolts of the rotating mechanism are not loose, there is no cracking at the welds, the lubrication is normal, and there is no abnormal sound; the mud beating mechanism has no burning deformation or cracking, and the connecting bolts are not loose; the hydraulic cylinder piston rod has no obvious wear, the ear shaft has no wear, the connecting bolts are not loose, and the seal has no leakage.

[0016] 3) Swinging nozzle: There is no cracking on the body; there is no deformation of the connecting rod, no wear on the pin shaft, and no wear on the spherical bearing; there is no abnormal noise in the reduction box, the temperature is <65℃, and the oil level is at the standard position of the scale line on the dipstick.

[0017] 4) Hydraulic station: hydraulic pump system pressure fluctuation ≤1MPa, temperature ≤60℃, no leakage, no abnormal noise; valves, pipes and interfaces are free of leakage.

[0018] 5) Hydraulic valve station: the valve block has no leakage and the connecting bolts are not loose; the manual reversing valve, throttle valve, check valve, pressure reducing valve and sequence valve function normally and have no leakage.

[0019] 6) Tie Niu: The motor bolts are not loose; the elastomer of the magnetic coupler is worn ≤3mm; the oil level of the reducer is normal, there is no oil leakage, the temperature is ≤65℃, the sprocket wear is ≤4mm, the chain is not stuck, and the wear is ≤2mm; the brake oil level is normal, there is no leakage, and the brake pad wear is ≤3mm; the clutch connecting rod is not deformed, and the gear wear is ≤3mm; the wheel wear is ≤5mm, the hook and the detection wheel are not stuck, and the wear is ≤3mm.

Claims

1. A method for discharging slag from a single taphole of an ironmaking blast furnace, characterized in that The following steps are involved: 1) Equipment and facility confirmation: Check that the tapping machine, mud gun machine, swinging spout, iron outlet ditch, mud sleeve, and taphole mud are in place normally: 2) Opening the taphole: The taphole opening machine uses a 45mm drill bit to open the hole. The taphole depth is maintained at 2.6~2.8 m, and the mud volume is 1.8~2.0 grids. The taphole is not damp. If the furnace is blocked by coke during the tapping process, the taphole should be immediately blocked and the blasting should be withdrawn. The taphole opening machine uses a 50mm drill bit to open the hole to 1.5m, and then uses a 45mm drill bit to open the hole. 3) Iron tapping: The iron tapping time is strictly controlled within 70-90 minutes to ensure that the slag and iron in the furnace are discharged cleanly; 4) Blocking the taphole: Check the daily maintenance plan for single taphole production equipment, and complete the inspection of the taphole opening machine, mud gun machine, swing spout, and hydraulic valve station 5 minutes before taphole opening.

Images