The formation of the smelting furnace slag layer

Infiltration of molten state in refractories copper matte with good mobility. Due to the surface in the reaction tower refractory lining is covered with a layer of dense with magnetic iron oxide for hanging slag layer is mainly composed of, so he struck the wall surface matte does not directly penetrate into the brick body, but first of all along the silicate slag channel infiltration within the material and the interaction and slag, slag at different depth generate Cu or Cu2O material.

Reaction tower wall surface slag although direct intrusion effectively prevents the copper matte, but did not completely eliminate the erosion caused by the matte of lining. Through the slag layer, there are still a small number of matte can penetrate through, and then along the brick body pores or cracks penetrate within the capillary channel brick. Because of the more close to the firebrickcenter, oxygen potential is higher, so into the brick body after the copper matte is prone to oxidation reaction. After reaction, the generated Cu2O exists between the lining the main crystal and the matrix, and no penetration into the other grains.

Molten copper oxide (CuO-Cu2O at 1140 DEG C when the low total soluble) will cause the increase of permeability refractory brick thermal conductivity, the resulting expansion of strong diathermy, lining spalling and, in which Cu is oxidized to CuO, the volume expansion of 75%; oxidized into Cu2O, volume increased by 64%. Therefore, from the microscopic structure, corrosion of matte on the reaction tower lining is mainly for the chemical structure of permeability, copper matte and the resulting stress reaction.

The electric arc furnace cover must use high alumina brick to prolong the service life

Electric arc furnace is a kind of using arc heating so as to high-temperature melting furnace metal equipment, but in the melting process, will produce very high temperature especially furnace cover place, while the high temperature also easily lead to cover the damage of electric arc furnace, which we need to do protection work relative to the therefore, we will choose high alumina brick to prolong the service life of electric arc furnace.

In the past the furnace cover mainly uses the silica brick masonry, but because of its refractory degree is not high, poor thermal shock resistance, slag corrosion occurred in droplet and spalling, resulting in shortening the service life. We therefore after changing a began to choose high aluminum brick with excellent performance and high alumina unshaped refractory material, so the service life can be improved, and will be 2 – 3 times higher to silica brick. If it is ultra high power EAF, because working conditions even worse, using firing or caustic soda high aluminum brick, this is because the high temperature strength of refractory brick is low, since the major, for hanging structure. Using direct bonded brick and magnesia chrome brick than ordinary magnesia brick and magnesia chrome brick is good, can greatly reduce the damage caused by thermal cracking structure cracking and spalling.

The above contents cover the, must use high alumina brick to prolong the service life of electric arc furnace in the knowledge that you have some understanding of it, if you want to ask more knowledge about the high aluminum bricks can consult us.

Introduction and application of the burner brick

The burner is also called the burning machine, is commonly known as the combustion device for industrial fuel furnace, can be understood as “the burner nozzle” abbreviation. Usually refers to the burning device body part, a fuel inlet, an air inlet and an air jetting holes, to fuel and combustion air distribution and combustion in a certain way after spraying role. The burner tile is an important part of the combustion device.

The role of the burner brick

The burner tile is part of liquid and gas fuel combustion device, the main role:

1. Fuel is placed in the burner brick is (refractory ) heated to the ignition temperature, making it easy to ignite and burn rapidly.
2. The burner brick and to maintain a certain temperature, the stability of the combustion process, avoid the ripple or fuel interruption phenomenon.
3. The organization the flame shape, to meet  the requirements of the heating process.
4. The fuel and air mixing further.

Therefore, in addition to the combustion device special minority (such as atmospheric burner), to install the burner brick, to ensure that the fuel nozzle and the gas burner and give full play to its performance.

The formation of the smelting furnace slag layer

Infiltration of molten state in refractories copper matte with good mobility. Due to the surface in the reaction tower refractory lining is covered with a layer of dense with magnetic iron oxide for hanging slag layer is mainly composed of, so he struck the wall surface matte does not directly penetrate into the brick body, but first of all along the silicate slag channel infiltration within the material and the interaction and slag, slag at different depth generate Cu or Cu2O material.

Reaction tower wall surface slag although direct intrusion effectively prevents the copper matte, but did not completely eliminate the erosion caused by the matte of lining. Through the slag layer, there are still a small number of matte can penetrate through, and then along the brick body pores or cracks penetrate within the capillary channel brick. Because of the more close to the firebrick center, oxygen potential is higher, so into the brick body after the copper matte is prone to oxidation reaction. After reaction, the generated Cu2O exists between the lining the main crystal and the matrix, and no penetration into the other grains.

Molten copper oxide (CuO-Cu2O at 1140 DEG C when the low total soluble) will cause the increase of permeability refractory brick thermal conductivity, the resulting expansion of strong diathermy, lining spalling and, in which Cu is oxidized to CuO, the volume expansion of 75%; oxidized into Cu2O, volume increased by 64%. Therefore, from the microscopic structure, corrosion of matte on the reaction tower lining is mainly for the chemical structure of permeability, copper matte and the resulting stress reaction.

Checking work of castable material before construction

Construction of casting material before should strictly check the following:

1, castable material construction is made of steel or hard wood templates are available. The template must be of adequate strength, good rigidity, not out of shape, do not shift, no leakage of slurry. Steel template to mold release agent. Wood template to brush waterproofpaint. The repeated use of the template to cleaning, painting can be used.

2 water, pouring material should be strictly according to the manual control, shall not exceed the limit. Under the premise of ensuring the construction performance, the amount of water should be less than.

3,  castable refractory mixing time should not less than 5 minutes. The operation to the use of forced mixer. Mixing should first dry mix, then add 80% dosage of water mixing, and then depending on the extent of wet and dry, gently stir until the remaining water, obtaining suitable work consistency so far. Stirring casting materialdifferent should first mixer clean.

4, pouring material must use the whole barrel bag full of. Stirring casting material generally good must be used within 30 minutes. Drying at high temperature working environment should be appropriate to shorten this time. Already first castable coagulation even caking not poured into the mould, nor of mixing water reuse.

5, if the project inspection unqualified should deal with qualified rear can construction. Expired materials shall not be used. Construction of castable to ensure that no power outages not interrupted construction.

The second quarter of Henan refractory products quality supervision and inspection results

2014 for the second quarter of Quality and Technical Supervision, Henan Province, therefractory product quality supervision and inspection of the province, were taken Zhengzhou, Luoyang, Xuchang, Nanyang four provincial cities and Gongyi a straight pipe county (city) 53 companies production of 89 batches of refractory products, a batch of the product does not meet the standard requirements.

This inspection according to GB / T 2988-2012 “aluminum brick”, YB / T 5106-2009 “clay firebrick”, GB / T 2275-2007 “magnesia and magnesia bricks“, YB / T 5049-2009 “skateboard brick” and other refractory product standards and product quality requirements express, the chemical composition of the product mass fraction, melt index, apparent porosity, bulk density, true density, apparent density, room temperature flexural strength, compressive strength at room temperature, heating permanent change, load softening start temperature, refractoriness,high temperature flexural strength, thermal conductivity, thermal expansion, thermal shock resistance and abrasion resistance at room temperature, such as 17 projects have been tested.

After sampling, a company of a batch Galaxy MgO-C (Specifications Model MT-14C production date 2014-2-28) does not meet the standard requirements, related to the carbon content of the project. Henan Province Quality and Technical Supervision said it had instructed the relevant provincial cities, straight county (city) quality and technical supervision departments in accordance with relevant laws and regulations of this inspection in substandard products and production companies and the law.

Refractory castable using validity period and size selection

一、Using effective period

Need watering tie with monolithic refractories, such as high temperature cement, refractory plastic, refractory castable, etc., must be checked before use its expiry date. Exceeds the material period, its performance will decline.

Unpacking refractory castable pocket, be sure to carefully view the manufacture date on the bag. Such as alumina cement shelf life of 3 to 6 months, cement vulnerable to air humidity during storage and transport and curdle, must be strictly checked.

Refractory soft plastic blank group, due to solidification into lumps, you can not using.

二、Granularity refractory castable

Refractory castable granularity shape, strength, size and composition, the quality of the masonry has a very important influence.

Check granularity shape, generally use visual methods. Such as knotted crucible induction furnace lining was prismatic granularity best with sharp corners. Check granularity intensity can be struck with a wooden hammer, watching the situation to determine its smash.

Check the size and composition of the particle size, the use of screening method. Sieving is carried out in the test chamber, which can be measured by the percentage of various particle size of the composition.

First check pattern according to the technical requirements of the stove on, pay attention to the size of the maximum size limits, and secondly to fire clay should be careful not lost too many fine parts, so as not to reduce its masonry performance.