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Integral masonry process and construction key points of refractory lining for gold roasting furnace

Integral masonry process and construction key points of refractory lining for gold roasting furnace

The refractory construction plan of the gold roasting furnace body is collected and integrated by the refractory brick manufacturer.

1. The pouring construction of the refractory castable on the distribution board of the roasting furnace:

(1) After the furnace shell and vault of the roasting furnace have been built and passed the inspection and acceptance, the distribution plate refractory castable construction will be started. The size of each part shall be checked and the embedded air nozzles shall be installed. The construction area shall be cleaned and the mouth shall be sealed. Pouring can be carried out only afterwards.

(2) Pour the light-weight thermal insulation castable first, and then pour the heavy-weight refractory castable. The castables are mixed with a forced mixer, and the mixer is rinsed with clean water to ensure that it is clean and free of impurities.

(3) The finished castable can be directly constructed after adding water and stirring according to the instruction manual. The castables to be prepared should be accurately proportioned. Add aggregates, powders, binders, etc. into the mixer, mix well, and then add an appropriate amount of water to mix for 2 to 3 minutes before construction can be used.

(4) The mixed castable should be poured in one time within 30 minutes.

(5) Castables that have been initially set shall not be put into use. During the construction of the castables, a vibrator should be used to compactly vibrate while pouring.

(6) The construction of the castable on the fluidized bed surface should be completed at one time, and there is no need to reserve expansion joints.

(7) The surface of the castable layer is required to be smooth and flat. 24 hours after the completion of pouring, watering and curing should be carried out. The curing time is not less than 3 days, and the curing temperature should be 10-25°C.

2. Masonry construction of refractory bricks for roasting furnace body:

(1) Refractory brick masonry requirements:

1) Refractory brick masonry should be built by kneading and pressing method (except for special transformations such as large bricks), and the expansion joint size shall be reserved as required, and the refractory mud in the joint shall be filled tightly and fully.

2) The position of the refractory bricks and the size of the expansion joints can be adjusted using wooden or rubber slabs. The finished refractory brick masonry shall not be collided or knocked on it.

3) During the masonry process, use high-concentration refractory mortar for joint treatment before the expansion joint is solidified.

4) The refractory bricks are processed by a brick cutter. The processed surface shall not face the side of the furnace and the expansion joint. The length of the processed brick shall not be less than half the length of the original brick, and the width (thickness) direction of the processed brick shall not be less than the width of the original brick ( Thickness) 2/3 of the degree.

5) When building the intersecting furnace wall, check the level elevation at any time and raise it up layer by layer. When leaving or reworking and dismantling, it should be left as a stepped chamfer.

(2) Refractory slurry preparation:

The refractory mortar for metallurgical roasting furnace masonry should be made of refractory mortar that matches the material of refractory brick masonry. Refractory slurry should be prepared by mixing with a slurry mixer. Try not to use the same mixing container for refractory slurries of different materials. When the refractory slurry must be replaced, the mixing equipment and container should be rinsed with clean water, and then the material should be replaced for mixing. The viscosity of refractory mortar can be controlled according to the on-site construction conditions, and refractory mortar that has been initially set shall not be used.

(3) Furnace wall refractory brick masonry construction:

1) The refractory bricks of the furnace wall should be built in sections. Before each section of the furnace wall is built, two layers of graphite powder water glass should be smeared on the inner wall of the furnace shell, and then the asbestos insulation board should be tightly pasted on the smear layer, and then the furnace Masonry construction of lightweight refractory bricks and heavy refractory bricks.

2) Each section of the furnace wall should be constructed with the furnace shell as the masonry sideline, while ensuring the flatness of the inner surface of the furnace.

3) When masonry parts with thermal insulation lining, light-weight refractory bricks should be laid to a certain height before laying heavy-weight refractory bricks for working lining.

4) When building the hole position, the position of the hole opening should be built first, and the surrounding furnace wall shall be built upward, and the closing bricks of each layer of masonry refractory bricks shall be evenly distributed.

(4) Vault brick masonry construction:

1) According to the center line of the roasting furnace, first build the arch-foot bricks so that the surface elevation should be kept on the same horizontal line.

2) The arch-foot bricks are special-shaped bricks and larger in size, so the rubbing method is not suitable for masonry. During construction, the surface of the refractory bricks should be smeared with an appropriate amount of refractory mud to make the adjacent refractory bricks have a close and good contact.

3) After the arch-foot bricks are completed and passed the inspection, start to build the first ring of vault bricks, and then build the second ring after the first ring of door bricks are built. The masonry process requires that the gap between the vault bricks should be tight. The size of the reserved expansion joints should be as uniform as possible.

4) The door-closing bricks of each ring of the vault should be evenly distributed on the furnace roof, and the width of the door-closing bricks should not be less than 7/8 of the original bricks, and the last ring should be poured with castables.

(5) Expansion joint construction:

The position and size of the reserved expansion joints of the furnace body masonry should be set according to the design and construction requirements. The joints should be cleaned before filling the expansion joints, and the refractory material of the design material should be filled according to the requirements. The filling should be uniform and dense, and the surface should be smooth. .