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Evaluation Report on the Expanded Trial of No-Water Ramming Mass for Jiuquan Steel Hongxing’s No. 7 Furnace
Release date:
2025-10-15
From May 29 to June 10, 2023, Zhengzhou Kexin Waterless Gunning Clay underwent an expanded trial at the No. 7 Blast Furnace in the Ironmaking Plant of Jiugang Hongxing Co., Ltd. A total of 32 tons of the waterless gunning clay was used during the trial. The test was conducted simultaneously at two tapping holes—south and north—of the No. 7 Blast Furnace, resulting in a combined 99 iron tapping events and producing a total of 57,452.4 tons of molten iron. Based on the results of this expanded trial, the following conclusions were drawn for Zhengzhou Kexin Waterless Gunning Clay:
I. Experimental Procedure
The expanded trial of Zhengzhou Kexin Waterless Gunning Material was conducted during the night shift on May 29, with the first iron tapping using the material occurring at furnace No. 7012496. The trial concluded on June 10, after the 7012613th iron tapping. Throughout the trial, no dampness or mud was observed during the tapping process. The average drilling time per tap was 4 minutes, while the average iron tapping duration was 155 minutes. A total of 99 iron tappings were performed, with two instances where drilling reached 3.1 meters, resulting in slight reddening of the tuyere—these were addressed by oxygen blowing to clear the blockage. All other tappings proceeded smoothly without any issues. During the iron-tapping sessions, the tuyere’s opening and closing behavior remained stable, with iron spatter occurring for an average of 6.3 minutes per session. After sealing the tuyere, it took approximately 20 minutes for the blast furnace gun to retract fully, ensuring the tuyere did not reopen spontaneously. Once the tuyere was reopened as usual, there were no signs of excessive molten iron flow or coke leakage. Overall, based on the trial results, Zhengzhou Kexin’s waterless gunning material effectively met the production requirements of No. 7 blast furnace in terms of iron-tapping time, iron spatter control, theoretical iron output, and material consumption.
II. Analysis of Experimental Data
1. Mud-packing pressure: 19 MPa; the ramming mass has just the right consistency—neither too soft nor too hard.
2. Iron tap operation status: The iron tap channel showed no signs of damp mud, leakage, or cracking. On average, the iron tap spouted for 6.3 minutes.
3. Opening time: Between 3 and 4 minutes, with a single-opening rate of 97.9%.
4. Iron tapping time: Average 155 minutes.
5. Tap hole depth: Maximum 3.5 m, minimum 3.3 m, with an average of 3.43 m. The tap hole depth meets the standard requirements for No. 7 blast furnace.
6. Iron Mouth Tensile Strength: Zhengzhou Kexin's water-free gunning material shows minimal changes in iron mouth diameter, with a reaming rate less than 1.2 times the standard—demonstrating strong tensile strength.
7. The iron tap opens easily, resulting in lower raw material consumption.
8. Mud Consumption: During this test, a total of 57,452.4 tons of water-free ramming mass were used to produce iron, with a total mud consumption of 32 tons, resulting in a specific consumption rate of 0.56 kg/t Fe.
III. Test Conclusions
After successfully trialing the water-free gunning material at Zhengzhou Kexin and analyzing the test data, key parameters such as tapping frequency, tapping duration, tuyere depth, ability to control iron spattering, and environmental performance all met the requirements outlined in the trial protocol. These results confirm that the water-free gunning material can effectively meet the maintenance needs of the No. 7 blast furnace, making it suitable for use in this specific furnace.
Attached is the paper version of the statistical table.
Blaster Technician at No. 7 Blast Furnace:
7th Blast Furnace Front-Shift Team Leader:
Hongxing Co., Ltd. Ironmaking Plant
June 11, 2023
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