Introduction of construction method of ramming material in intermediate frequency furnace

how to extendIntermediate frequency furnace ramming materialThe service life? Let's briefly introduce the lining material, knotting technology and oven method of the intermediate frequency furnace ramming material.

1. Furnace lining material

When choosing furnace lining materials, you should pay attention to 2 points:

1. Confirm whether the lining material used is acidic or basic.

2. Confirm the chemical composition and particle size ratio.

3. If the finished sand is used, it must be checked whether it is within the validity period, whether it is damp and the compressive strength is reduced.

2, knotting technique

The quality of the knotting quality of the furnace lining directly affects the service life of the furnace. Therefore, when the furnace is knotted, in addition to the process regulations, the following points must be paid attention to:

(1) Before tying the knot, the electrician, pliers, and foreman should be notified to conduct a comprehensive inspection, especially the cooling (waterway) system, the furnace tilting system, the control circuit, etc., and the furnace builder should follow up and confirm.

(2) Participants in the furnace are not allowed to carry anything, such as mobile phones, keys, watches and other items, and require everyone to work without pollution.

(3) When adding sand, it should be lowered as much as possible, and spread evenly.

(4) For the brick laying parts at the furnace bottom and furnace mouth, the brick joints should be less than 1mm, and the joints should be strictly staggered.

(5) The method of "shaking first and then vibrating" is adopted when tying knots. The rocker should be inserted to the end, first light and then heavy, shake 8-10 times each time it is inserted, and knot after shaking, the order is the edge first and then the center.

(6) The sand at the bottom of the furnace should be added at one time, and it is strictly forbidden to add it in stages.

(7) After the crucible mold is finished, the sand around the crucible should be loosened to a thickness of 15-20 ram. Then add sand to tie the furnace wall.

(8) When lowering the crucible mold after the bottom of the furnace is knotted, make sure it is straight. Then make a ring-shaped 3-point fixing ring to fix the crucible mold at one time. In order to prevent the crucible mold from moving or floating when knotting After positioning, place a special furnace-building weight in the crucible.

(9) When knotting the furnace wall, the method of continuous knotting is adopted. The thickness of each batch of materials is 200280mm. After each batch of materials is knotted, the surface must be loosened by 1520ram and the next batch of sand materials must be added.

(10) The mouth of the furnace and the mouth of the furnace should be hammered with a hammer, scraped with a scraper, and the chamfer should be about 45 degrees Celsius near the inner side of the crucible.

(11) In order to prevent sundries from falling during the knotting process, a shelf should be set up before knotting. If sundries fall into the sand, try to take them out.

(12) After knotting, use compressed air to blow off dust, sand and other debris that fall on the sensor. After knotting, the furnace should be evenly walled, without segregation layers, and the upper and lower layers are tightly connected without delamination. It has a large bulk density, and all parts of the furnace lining are uniform.