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There are many ways to build refractory bricks, such as the flat laying method, side laying method, and vertical laying method, and matching refractory mud is required for laying bricks.
Refractory brick masonry method:
1. The refractory brick-flat laying method is mostly used for the furnace wall, and a few are used for the lower layer of the furnace bottom. In our country, the common flat masonry method is the brick wall “one along one top” masonry method. Ring bricks (such as blast furnace walls) are also laid flat.
2. Refractory bricks – side laying method The side laying method is mainly used for two parts: one is laying the bottom bricklayer, such as the bottom of the open hearth furnace and heating furnace; the other is the side vault, such as the tapping hole arch of the open hearth furnace.
3. Refractory brick-vertical masonry, also known as vertical masonry, is mainly used in two parts: one is the top layer of the furnace bottom, such as the bottom of the open hearth furnace and the bottom of the blast furnace; the other is the working layer of the furnace bottom, such as the bottom of the open hearth furnace. Take the straight brick as an example, the large plane when laying flat. Place it in a horizontal position; when laying sideways, the side (also known as the middle, 230x65mm) is placed in a horizontal position, and when laying vertically, the small face is placed in a horizontal position.
Also known as fire clay or joint material. It is used as a joint-laying material for refractory product masonry.
According to the material, it can be divided into clay, high alumina, silicon, magnesium refractory mud, and so on. Made of refractory powder. It consists of adhesives and admixtures. Almost all refractory raw materials can be made into powder for making refractory mud. Ordinary refractory clay is made of refractory clinker powder and an appropriate amount of plastic clay. It has low strength at room temperature and high ceramic bonding strength at high temperatures. Water hardness, air hardness, or thermosetting bonding materials are called chemical bonding refractory mud, which will produce a certain chemical reaction before forming the ceramic bonding temperature. The particle size of refractory mud varies according to the requirements of use. The control particle size is generally 11mm, and some are less than 0.5mm or finer.
The material of refractory mud should be consistent with that of masonry refractory bricks. In addition to being used as a joint material, refractory mud can also be used as a protective coating for linings.
Precautions for refractory brick refractory mud
The masonry refractory brick refractory mud should follow the following principles:
1. Before laying refractory bricks, various refractory muds should be pre-tested and pre-built to determine the bonding time, initial setting time, consistency, and water consumption of different muds;
2. Use different utensils to prepare different muds and clean them in time;
3. Clean water should be used for mud of different quality, the amount of water should be weighed accurately, the harmony should be uniform, and it should be used according to the adjustment. Do not add water to the prepared water, air, and hard mud, and do not continue to use the initial setting mud;
4. When preparing the combination of phosphate and mud, the specified feeding time should be guaranteed and adjusted at any time. The prepared mud must not be diluted with water. Due to its corrosive nature, the mud must not come into direct contact with the metal casing.
The composition and amount of mud used for masonry high alumina bricks
High alumina brick refractory mud is made of refractory fine aggregate and binder and is made into the mud of different consistency with liquid binder in a certain proportion. The refractory temperature and chemical composition of the refractory mud should be compatible with the refractory products used in combination with the refractory properties and chemical composition. The prepared high alumina brick refractory mud should have certain bonding strength at room temperature, high-temperature flexural resistance, shear strength, small high-temperature shrinkage, good air tightness, and good construction performance.
The construction performance of masonry high alumina brick slurry is mainly manifested in spreadability, memorability, dehydration, and plasticity. Generally, the water retention time of mud is used to identify its construction performance. The so-called water retention time is to stir the mud into an appropriate consistency and spread it on the brick surface to a certain thickness with a trowel. The time for water to be absorbed by the brick surface is generally 1-2 minutes. Too long or too short is not conducive to operation. After mixing the mud. There should be no precipitation or segregation after a short period of storage.
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