The selection of castable should focus on products cost-effective

Now with some heating furnace and increase the number of metallurgical equipment, peopleneed to use in the production process to Tianjin castable such products, which mainly showed granular or powder, widely used in these devices, its mobility is very good. With the improvement of the production technology, superior in quality is more and more secure. In this case, the use of materials with refractory properties in this continuously under a wide range of conditions, how to improve the product purchase need to pay attention to the price is a lot of problems in the process of industrial production, to improve our use of demand.

First of all, the better quality products, must be able to fully guarantee the products we need quality, has good fireproof effect, make our product has very good practical value. We choose
this kind of Tianjin casting material production enterprises need to be very careful, because of the particularity of this kind of  refractories in the composition and use, need to use of the technology is still relatively high, a little mistake may cause problems on the use, especially this kind of product in the production, storage, if not able to pay great attention to the process of transportation and use, it may cause some security hidden danger, the development of the entire production process is negative. So the quality should be put in the first.

Second, product price is very reasonable. At present has the ability to produce this kind of Tianjin casting material manufacturers are also a part of, according to the manufacturers and some of its usage, we can measure how well each manufacturer’s product price and we need to pay the prices in this process, also includes transportation costs, by contrast, choose to create a higher performance price ratio.

Refractories for iron and steel furnace

Since the 21 century, the production line of the rapidly expanding, together with changes in coal quality, as well as the influence of environmental protection and a series of conditions, some large and medium-sized pre collapse kiln during the production process, especially the basicrefractories by different degree of damage, affecting the steel furnace operation cycle, has become an important condition control steel kiln operation rate.

Now, heavy pre collapse kiln (Nissan and over 5000 tons of furnace) basicrefractory material used, its important commodities magnesia spinel brick, magnesia chrome brick, dolomite brick and magnesia zirconia brick series, while the domestic mainly magnesia spinel brick and magnesia chrome brick.

1. magnesia spinel brick

Magnesium spinel refractory brick common is the use of pre spinel and combined magnesium material synthesized by mixing, forming and firing is made, another way is to add compound aluminum in magnesium compound, during sintering synthesis of spinel. The greater use of the market is made first modes of spinel brick; the brick has good thermal shock stability, thermal chemical corrosion of high ability, important for transition zone.

2. magnesia chrome brick

Direct the conclusion of magnesia chrome brick has high temperature resistant performance good, SiO2 corrosion resistance and anti chemical reduction effectiveness. High intensity and have high and anti stress ability of the machine, coating with good performance, many used in the sintering zone.

3. magnesium dolomite brick

Magnesium dolomite brick is the raw material through organic concluded agent forming and firing. Magnesium dolomite brick has the following advantages: with the chemical stability and the gas of iron and steel clinker; high refractoriness; easy to hang and kiln crust; the price is cheaper. So, in foreign magnesium dolomite brick with more, but it is more easily liquefied.

4. magnesia zirconia brick

Magnesia zirconia brick has good using prospect, but because of the high cost, the spread was limited.

Acid proof brick gun refining narrowing and sintering

Volume reduction is a key characteristic of acid resistant brick gun mixing change, reducing the volume of the size of the value, not the same in different temperature range. The majority ofacid resistant refractory brick gun tried to narrow temperature at 600~650 deg. C.

Along with physical – and acid resistant brick gun refining process of chemical change, true proportional acid proof brick have changed. 400~650 reduced the temperature range from 950 DEG C, liquid phase, followed by the occurrence of the generation and growth of mullite crystals, Mo, true proportional value unceasingly to rise, at the temperature of 1350~1400 DEG C during, true proportional tends to be stable, then the acid resistant brick has presented considerable dense static. The true proportion of acid resistant brick clinker general should not be less than 2.70.

Quality and acid resistant brick acid resistant  refractory brick clinker sintering closely. Animportant symbol of acid resistant brick sintering is composed of dense block, porosity outstanding outstanding decline, color changes, and has shown a glass colored luster. The sintering mechanism of acid resistant brick is important to liquid phase sintering process, the sintering function is so important to occur at high temperature liquid phase with the number of attributes, namely in the number flux magazine containing acid proof brick in the variety, and Al2O3/SiO2 ratio, sintering temperature and sintering. The range is a critical property of acid proof brick, acid content in general journal brick is less, the sintering temperature is higher, and the narrower the sintering range. Degree of sintering brick acid through conventional water absorption or bulk density said, ordinary water absorption rate is less than <5 font="">

Application of epoxy mortar used in blast furnace.

Blast furnace used in treatment of iron mud gun port, through the usual is a water gun mud, but in the steel yield is high, the epoxy mortar are more susceptible to iron slag machineerosion and chemical corrosion, resulting in a blast furnace slag not net, not only affect the blast furnace high yield smooth, also easy to send the world iron process of iron mouth off, resulting in iron mouth running large flow caused by accident. At the same time, because of the iron export surge, prone to iron mouth call “bazooka” accidents such as scald people.

Ingredients important producing anhydrous stemming ratio (%): brown alumina brick 15-24, SiC 6-15, black 20, white mud 12-16, tar, 18-20. The gun mud pressure intensity 20Mpa, easy to speak in the blast furnace mouth machine openings and anti erosion function better.

An important component of white mud amount is too large, will reduce the excessive mud gun, which occurred after hours, crack, impact stemming humanity, in stemming the adding amount of 12% basically, gradually increase the volume, current after firing line changes to +0.3%, the best performance, the plasticity is high, a steel at high temperature have a good micro expansion, no crack, no effective away by expansion, with iron, iron flow channeling cracks donot bring into stocks and with spray, burning out the serious crisis of cooling wall.

An important component of low, medium temperature sintering agent amount, will have the influence to the stability of iron, sintering agent was added to make the gun mud formation of low melting material under high temperature, thereby stemming corrosion resistance variation, when tapping a splash phenomenon. Find the ratio of 2.5%, treatment of iron mouth, than water stemming save 25min time, and does not affect the iron groove processing, iron, iron flow stability.

The above anhydrous stemming in domestic steel reference 1, No. 2 blast furnace, a water gun mud compared with the same period, the following skills: blast furnace iron mouth indicators pass rate rose 2%, iron punctuality rate rose 6.6%, iron content difference pass rate rose 8%, iron mouth iron wind reduction rate decreased 96%, every day can increase your iron blast furnace operation, safety parameters have also been mobilized. The development and application of anhydrous stemming is very successful, dedication to strengthen property high made of blast furnace.

High strength low cement castable

[purpose] heating furnace; furnace flame environment such as rolling heating soaking pit wall, top, bottom, pipe, burner cast or prefabricated, industrial boiler body; chemical equipment such as ammonia, a two conversion furnace lining casting;

[Characteristics]

high refractoriness — low cement castable content more than 1650-1800 DEG C, refractoriness, high temperature performance;

Intensity high — temperature, high temperature strength, anti erosion, anti stripping;

Anti erosion — at high temperature for various kinds of steel slag has strong resistance to erosion ability;

[Usage]

According to the proportion of water, stir into a mortar machine, vibration molding.

[Storage]

25kg/ bag sealed package at room temperature for 3 months.

Skills preferred in pig iron refractory using

Xinmi Changxing refractory main products of bottom blowing argon with a series of quick drying pouring material is listed as national torch plan project focus of permeable brick, gun furnace, the skill level of international priority; between the working lining refractory material for ladle, with a series of skateboard outlet, between three large bulky package casting goods has reached international advance level.

Productivity growth is the issue grows the important power. Raised for the project of 100000 tons unshaped refractory, 200000 ventilation bricks, 25000 tons of brick, 10000 tons of silicon nitride silicon carbide brick, concluded 20000 tons slides, 5000 tons casting three pieces are to be 20 at the end of the year completed and put into production, 50000 tons of alumina magnesia carbon brick foresight will be put into operation in 2010 May, after the achievement growth is productivity have put on the important power.

The exchange rate will continue to maintain the hair foreseen before and after 35%. Commodity cost structure, raw materials accounted for 82%, accounting for 4% of human resources, and depreciation accounted for 14%, by raw materials price greater impact. The enterprise commodity wool exchange rate has remained around 40% high, causes include:

First, price inertia causes the price to maintain high, before 2000, the steel mill in refractory simply from foreign entrance, after gradually realize the entrance is replaced, the unit price is still maintained at a high level;

Second, because the inserted steel enterprises need annual certification, after insertion has some monopoly power, high insertion wind barriers, greater responsibilities (such as causing the steel leakage accident must bear the compensation duty) make wool exchange rate to maintain a high level;

Three, refractory material as supplies accounted for only 1% before and after the cost of steel making, steel prices is not sensitive to the price; fourth, enterprises pay attention to innovative products R & D, the majority, but also conform to the user’s skill requirements, unceasingly withdrawal new goods and to mobilize additional value of commodity, have strong pricing ability, thus maintaining a higher gross rate the level of.

Application of epoxy mortar in blast furnace.

Blast furnace used in treatment of iron mud gun port, through the usual is a water gun mud, but in the steel yield is high, the epoxy mortar are more susceptible to iron slag machineerosion and chemical corrosion, resulting in a blast furnace slag not net, not only affect the blast furnace high yield smooth, also easy to send the world iron process of iron mouth off, resulting in iron mouth running large flow caused by accident. At the same time, because of the iron export surge, prone to iron mouth call “bazooka” accidents such as scald people.

Ingredients important producing anhydrous stemming ratio (%): brown alumina 15-24, SiC 6-15, black 20, white mud 12-16, tar, 18-20. The gun mud pressure intensity 20Mpa, easy to speak in the blast furnace mouth machine openings and anti erosion function better.

An important component of white mud amount is too large, will reduce the excessive mud gun, which occurred after hours, crack, impact stemming humanity, in stemming the adding amount of 12% basically, gradually increase the volume, current after firing line changes to +0.3%, the best performance, the plasticity is high, a steel at high temperature have a good micro expansion, no crack, no effective away by expansion, with iron, iron flow channeling cracks do not bring into shares and splashing, crisis of cooling wall serious burn.

An important component of low, medium temperature sintering agent amount, will have the influence to the stability of iron, sintering agent was added to make the gun mud formation of low melting material under high temperature, thereby stemming corrosion resistance variation, when tapping a splash phenomenon. Find the ratio of 2.5%, treatment of iron mouth, than water stemming save 25mins, and does not affect the iron groove processing, iron, iron flow stability.

The above anhydrous stemming in domestic steel reference 1, No. 2 blast furnace, a water gun mud compared with the same period, the following skills: blast furnace iron mouth indicators pass rate rose 2%, iron punctuality rate rose 6.6%, iron content difference pass rate rose 8%, iron mouth iron wind reduction rate decreased 96%, every day can increase your iron blast furnace operation, safety parameters have also been mobilized. The development and application of anhydrous stemming is very very successful, dedication to strengthen the property of high yield and make the blast furnace.