Mud cannons are hard to beat
The main reasons why it is difficult to blow mud without cement guns are as follows:
1) The slag iron is not exhausted, and the iron hole is not sprayed or the iron hole is blocked by the false wind, which increases the resistance in the iron hole.
2) The iron mouth eye is too far from the center, and it is not on the same center line as the mud gun nozzle, which makes the gun mud spit out unpleasantly.
3) When the iron hole is opened, it is not completely penetrated, the center of the iron hole leaks, and the front mud bag exists, and the resistance is large when mud is blown.
4) The large pieces of falling off the furnace wall are not completely melted, and piled up in front of the iron hole channel, which increases the mud resistance.
5) Due to the resistance change in the furnace, the hearth works unevenly, and the iron hole that cannot be driven into the mud is not very active, and there is not enough space for the gun mud to enter.
6) The furnace temperature fluctuates greatly. When the molten iron temperature is too high or too low, the slag iron is not easy to expand.
7) The mud can be combined with the transition pipe or the mud has been stored for too long, and the mud will become dry and hard, and the filling will make the mud cannon immovable.
8) When the mud is broken in sections, the intermediate pause time is longer, which makes the forward friction of the gun mud in the iron mouth increase and cannot be pushed.
9) Excluding all external factors, the mud cannon suddenly cannot penetrate into the mud, which is caused by the high Masha value of the cannon mud itself.
On-site solution: You can use gas to burn the mud gun before mud is blown to increase the temperature of the cement-free gun.
Formula adjustment method: increase the amount of tar added, adjust the clay, adjust the clay to increase the mixing time.
Clay gun pressure is low
Solution: Need to adjust the strength ratio, the ratio of clay, and reduce the amount of tar added.
Difficult to open the iron mouth
First, analyze where it is difficult to drill holes in the iron hole. Different positions mean different reasons. The sintering performance of gun mud at different temperatures is different.
1) It may be caused by large cracks in the mud;
2) Difficulty in opening usually occurs in ultra-deep tapholes, because ultra-deep tapholes are prone to cracks in gun mud and iron leakage occurs. The drill bits used when opening ultra-deep tapholes are severely worn, and the cutting ability is weakened and cannot penetrate the tip of the mud pack. The red hot hard shell, coupled with the powerful hammering force of the opening machine, will easily cause the mud bag at the tip of the iron mouth to crack and produce slag iron.
3) The Marsha value of anhydrous gun mud itself is too high.
On-site solution: If iron leakage is found in the taphole, it should be blocked in time, and the tapping conditions can be tapped in time, and the wind can be appropriately reduced. When re-mudging, it is necessary to reduce the mud volume, increase the mud pressure, reduce the mud rate, intermittent mud, through intermittent mud, the newly entered mud will make up for the cracks in the front section of the gun mud after sintering. , Use physical means to reduce iron leakage, but it requires the cooperation of the operator in front of the furnace.
Formula adjustment method: reduce the amount of clay added, and adjust the solution by adding an appropriate amount of expansion agent.
The iron mouth is flaring too fast
Solution: Adjust Al2O3 to increase the resistance to hot metal erosion, and adjust SiC to increase the slag resistance.
splash
1. Reasons: 1) Operation in the furnace, water leakage in the furnace, water leakage in the small jacket (in the tuyere casing)
2) Gas leaking from the iron mouth (the iron mouth is shallow)
3) The sintering of anhydrous gun mud is not good, there are faults, and the volatile matter in the gun mud tar (volatility is divided into high temperature or external reasons, which causes a certain component in the material to volatilize into gas).
4) The temperature of the furnace is too high, and the iron hole is broken.
5) The porosity is too high (caused by the gun mud itself), (breathability) is mainly due to two reasons
In the case of low porosity, the volatile content of the waterless gun mud itself cannot be ruled out, but it can only come out when the iron is tapped and cause splashing.
The porosity is too high, the density of the gun mud in the iron mouth is low, and the strength is low. The molten iron penetrates into the gun mud, causing the gun mud to break into small pieces, which will cause splashing during scouring.
On-site solution: Eliminate the factors of equipment and blast furnace. If the quality of the blasting mud is caused, the speed of blasting mud can be reduced to make the blasting mud time sintered; when opening the hole, the hole can be half of the time, and after stopping for 5-10 minutes, Then open the mouth to make the gun mud fully burnt.
Recipe adjustment method: reduce the tar content, increase the amount of coke powder, improve the sintering performance, and reduce gas leakage
The iron mouth is too short
The main reason for the shallow iron hole is that the poor strength of the gun mud is related to the operation pressure of the mud gun, and it is also caused by the abnormal furnace temperature. Increase the metal powder, improve the quality of the clay, adjust the strength distribution, close the top of the iron mouth, and increase the amount of mud.
Mud bag is easy to break
It is related to the opening method of the iron mouth, reducing the high temperature strength, reducing the mud gun driving speed, increasing the mud pressure, increasing the amount of graphite added, adjusting the shape of the mud bag, increasing the ductility, reducing the high temperature strength, reducing the amount of tar, and increasing mica The amount of addition, the time required to suffocate the gun is generally 10-20min.
Mud leakage
The main reason is that the taphole is damaged or the slag iron is not clean and sticks to the taphole channel. Another situation is that the gun mud itself is too soft and becomes thinner at high temperatures.
On-site solution: clean the contact surface of the mud cannon, and delay the retreat time when the mud cannon.
Formula adjustment method: reduce the amount of binder and asphalt powder added.
Run the big stream
The main reason: on the one hand, the gun mud is not resistant to scouring, and the diameter expansion is too large when tapping iron; on the other hand, because the addition of the gun mud binder is too high, the low temperature sintering performance in the gun mud deteriorates, and the gun should be withdrawn within the specified time. Later, the pressure in the furnace will passively squeeze the gun mud out of the iron hole.
On-site solution: immediately stop the use of this batch of gun mud and mix it with other batches of gun mud in different proportions.
Formula adjustment method: add more silicon carbide, fine-tune the addition of clay, increase the mixing time, and make it evenly mixed.