Modulation principle of slurry used for refractory brick

Light Weight Mullite Insulation Brick can be widely used as lining or insulation layers of various industrial furnaces and kilns in metallurgical industry, machine building industry, ceramic industry, chemical industry.

Brickwork with refractory slurry should follow the following principles:
    (1) to deal with all kinds of refractory slurry pre experiment and pre laying brick front, confirm the bonding time, different mud initial setting time, consistency and water;
    (2) Modulation of different mud to use different instruments, and timely cleaning;
    (3) Modulation is not homogeneous slurry to use clean water, water should be accurate weighing, blending uniformly, adjusted with the use. Have good hydraulicity and modulation of hard mud shall not add water use, has the initial setting of mud may not continue to use the;
    (4) Modulation with phosphate mud to ensure refractory material time trapped provisions, with the use of post set, well modulated mud arbitrarily diluted with water. This kind of mud for corrosive shall not be in direct contact with the metal shell.
    We take the zero defect management idea, through the refractory production process from beginning to end. All the time since, in the pursuit of perfect quality at the same time, also constantly improve the service system, concerned about each of your needs, to provide professional sales and technical service for you.

http://www.yilongrefractory.com/news/Modulation%20principle%20of%20slurry%20used%20for%20refractory%20brick.html

The Best Refractories for Induction Furnace -- 25+ Heats Silica Ramming Mass

In recent years, silica ramming mass is widely used in induction furnace. Compared with traditional refractory lining material, this product is of lower cost, shorter sintering time and better working condition. 


To offer clients better refractory products, we have successfully developed our 25+ heats silica ramming mass. As per actual working, we summed up the material consumption as following.
1. First heat: 10-15mm
2. Rest heat: 3-5mm


As per our experience, we should leave 70mm as save level. So if the lining thickness is 180/300/450mm, we could promise the least service life of our refractory material to be 25 heats. If the working condition is convenient, 30-40 heats is no problem.


 Furthermore, our silica ramming mass can also be applied in tundish and ladle. Service life can namely be 48-60 hours/ 200+ heats. 


Because of the great advantages as above, our silica ramming mass is very welcomed by our clients all over the world say Bangladesh, Ghana, South Africa, and Indonesia, etc. If more interests, please feel free to make us informed, our professional teams are ready to give you our reliable service. For new clients, we would offer more preferential as following.
1. Lower price trial order
2. Professional refractory technicians overseas service


Therefore, what are you waiting for? Talk your phone and call us!

http://www.yilongrefractory.com/news/The%20Best%20Refractories%20for%20Induction%20Furnace%20--%2025+%20Heats%20Silica%20Ramming%20Mass.html

How to Choose Refractory Bricks Used for Different Parts of Blast Furnace

Mainly used for coke oven, hot blast stove, acid steelmaking furnace and glass melting furnace. The products can be manufactured according to customers' different requirements.

 How to use Refractory let it has anti damage ability? The development of matching with refractory material according to the clinker rotary kiln each work with the different mining conditions, in a targeted manner to configure different anti damage of refractory materials, and considering the basic matching problem of each work tape lining service life, reduce maintenance times to stop the kiln, each work with lining, reach namely damage resistance independent and phase the purpose of matching cycle. Lining material preheating zone selection of good chemical stability, alkali erosion leaf wax stone brick and strong, the high siliceous raw pyrophyllite with low alkali, alkali resistant bricks made of this raw material, whether or not to burn the Chengdu firing with alkali resistance strong, but the strength is high, nearly doubled than clay brick life.
    The completion of the industrial experiment stage in Krivoy Rog coking plants, coke oven masonry and recommended room three thermal repair methods: flame gunning; using oxygen to the ceramic welding; using the exothermic material (heating material) to repair. The process principle of common: with the help of heat generated to form a protective layer on the surface of refractory composite masonry mending surface.
    Flame gunning method of flame gunning refractory products, powder particles melt in the liquid or gaseous fuel flame, and was sent to the surface to be repaired. At this point the masonry was nozzle flame supplementary heating, so using this method may not have special restrictions on temperature is put forward in this paper, and can adopt refractory powder cheaper to obtain high-quality gunning layer. Principle of ceramic welding method is adding to the material of strong oxidant (exothermic material) - aluminum and silicon. Wind transport by means of oxygen jet flame method, oxidant and refractory powder to the surface to be repaired.

http://www.yilongrefractory.com/news/Increase%20refractory%20materials%20anti%20damage%20ability%20by%20changing%20using%20method.html

Requirements of Refractory Materials During Blast Furnace Lining Repair

Composed of high temperature electric sintered anthracite and graphite with additives, the products are mainly used for filling the gap between carbon blocks and cooling devices through cold ramming process, and also for the gaps between carbon blocks and between carbon blocks and refractor bricks.

Generally speaking, there are several blast furnace lining maintenance methods including grouting for lining making, cold spray technology, digging hole on furnace shell technology and remote control spray technology.


Grouting for lining technology can be widely applied to hot point short-term repair of blast furnace stack and furnace bosh. It is a means of prolonging furnace life, but it must be repaired repeatedly to keep the lining at a certain thickness. Different furnace parts use different refractory material, the mud consistency is a key element for the success of grouting for lining technology.


Using cold spray technology not only can make blast furnace cleaned thoroughly, but also can firmly bond old and new firebrick refractory and then lead to a good furnace lining form and make the first run of the blast furnace successful. While, repairing blast furnace in cold spray technology needs too much time, it is a limited element for its widely using.


Digging hole on furnace shell and gunning damaged parts with long gun technology is usually applied to damaged furnace lining and shell technology, it uses a long gun to spray and repair the inside damaged parts from outside. This method has the advantages of speed spraying and short wind time, but it is only suitable for partial damage.


Remote control gunning technology is an advanced technology which is now being developed and used in China and many other countries in recent years. Its gunning time is short and its gunning range is large, but it needs complex technology. 


In a word, grouting for lining technology requires appropriate refractories mud consistency; the other three repair technologies require good refractory adhesion under high temperature and normal temperature so that to make spraying coating in a certain thickness continuously, and the coating is tightly bonded into a no pull-off and dense formation which can be dried and warmed fast.

How to Choose Refractory Bricks Used for Different Parts of Blast Furnace

1. Good corrosion/erosion resistance 2. High temperature performance 3. Longer service life 4. Stable structure 5. Thermal shock resistance

How to choose refractory brick used for different parts of blast furnace?

When choosing refractory brick used for different lining parts of blast furnace, we should follow some principles. The refractory lining of every part should fit the parts thermal current intensity, so that the lining can maintain previous vertebral shape and stability under the impact of strong heat flux. 

Here are some methods of selectingrefractory brick for sale for every part of furnace lining.
(1) Furnace throat. It mainly needs to withstand impact and abrasion of burden, so generally we use steel brick or water cooling steel brick for the furnace throat.

(2) The upper shaft. Plus the burden descent and ascending gas flow of scour and wear. Therefore, we should choose resistance to chemical erosion and abrasion resistance of refractory material, the most appropriate is high relative density brick, high density, high aluminum brick or phosphoric acid impregnated clay brick.

(3) The middle and lower part of nozzle refractory furnace and furnace bosh. The main mechanism of damage is thermal shock, high temperature gas scouring, and impact of alkali metals, zinc and carbon deposition, as well as chemical erosion of the initial slag. For those three parts, we should choose refractory materials with properties of thermal shock resistance, slag erosion resistance and erosion prevention. For blast furnace whose volume is smaller than 1000m3, we can use aluminum carbon brick. 

(4) Furnace bosh. Hot gas erosion and iron slag erosion are the main reasons for furnace bosh damage, this part of the heat flux intensity, refractory material refractory fiber felt life not long (as long as 1 to 2 months, as short as 2 to 3 weeks), generally used in refractory degree is high, load softening temperature is high and the volume density of refractory material, such as the high aluminum brick, alumina carbon brick. 

(5) Hearth tuber. This site is only in blast furnace of oxidation reaction area, high temperature from 1900 to 2400 DEG C, lining by damage caused by high temperature thermal stress. Composite brick masonry hearth tuyere zone is adopted by the modern blast furnace, material for high alumina, corundum Mo mullite; corundum and silicon nitride combined silicon carbide, useful also hot pressed carbon block. 

(6) The lower part and bottom of hearth. For those two parts, we use hot pressing small carbon brick, micro porous carbon brick, and hot semi graphite carbon brick with high thermal conductivity, good resistance to penetration, good resistance to chemical erosion, low porosity and micro aperture, as well as brown corundum or gray corundum brick used for ceramic cup.

Introduction of chrome nozzle filler sand and how it causes automatic opening

Made from chromite sand and additives, chrome nozzle filler sand has the advantages of high specific gravity, good fluidity, high melting point, not excessively sintered, etc. When the added chromite sand is over 60%, chromite will be in continuous distribution, which can help forming continuous sintered layers.

Under high temperature, the FeO in chromite sand will react and dehydrate, producing quadratic spinel, then the volume of sintered layer will change and crack, when the slide gate plate is opened, the unsintered nozzle filler sand in the lower part of nozzle will flow out very fast, the cracks in the sintered layer will expand, due to the static pressure of molten steel, the sintered layer will be totally broken. All the above steps finally lead to automatic opening.

Reasons of why tundish dry vibration mix takes the place of tundish insulation board

Reasons of why tundish dry vibration mix takes the place of tundish insulation board

Following the clay and high alumina brick, tundish insulation board, tundish coating, dry vibration mix is the fourth working lining materials for tundish. Following compare shows why dry vibration mix could replace the insulation board successfully.

Insulation board, which is mainly used in cold tundish (one without baking before being used), it devotes much for us in energy saving and heat insulation. But, due to its fatal disadvantage, it is being eliminated quickly.

1. Bonded with many agent, insulation board add silica and hydrogen under high temperature in steel liquid, reduce its purity, produce harmful gas to hurt worker’s health. VS: Dry vibration mix is bonded without carbon, produce no sharp aroma, and greatly reduce avoid the pollution for steel liquid and environment. 

2. Short using life (for common steel, only 8 Hrs, for Mn-alloy steel, only 4hrs). VS: dry vibration mix usual using life: 24 hrs min, when worked with the fast exchange nozzle, it could reach average using life 45hrs.

3. Easy to be broken during transportation, once one piece is broken, the whole set will can’t be work. VS: dry vibration is premixed and packaged in waterproof jumbo, applicable for ship, truck, train, air, etc long way transportation.

4. Low corrosion resistance, easy to make tundish become leakage. VS: dry vibration mix is made by ramming, dense and stable, after sintering, form a protect layer with tundish backing layer, could improve tundish using life and reduce spare tundish number.

Therefore, should you want to improve your tundish life, please do not hesitate to try Changxing Refractory dry vibration mix, 24 hrs using life is waiting for you.