SU1211293A1 - Slag-carrying bowl - Google Patents

Description

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The invention relates to ferrous metallurgy and can be used in a steelmaking shop where slag-carrying bowls are used to transport slag melt.

The purpose of the invention is to reduce costs and; Increased bowl durability.

The drawing shows a slag-like bowl with a protective coating, a general view.

The bowl contains a metal housing 1, on the inner side of which periodic recesses 2 are filled and a protective coating 3 is applied, in contact with the slag melt 4, which has a solid phase 5.

The slag bowl works as follows.

From the open-hearth furnace, the slag melt is poured into the slag chute, while the protective coating 3 prevents direct contact of the hot melt 4 with the metal body 1.

During a simple hot slag bowl, part of the slag solidifies and a solid phase 5 is formed. When cleaning the bowl, the proposed coating is easily separated from the housing 1 together with the solidified phase 5 and cleaning is performed without difficulty, very efficiently.

. To substantiate the percentage of ingredients in the laboratory, the mixtures listed in Table 2 were made. one.

The results of laboratory and industrial testing of mixtures are given in Table. 2

The best properties has a mixture of 2.

Mixtures 1 and 4 are characterized by increased shrinkage, which can lead to cracking of the coating.

Mixtures 3 and 5 have a lower refractoriness. A distinctive feature of the proposed mixture for a protective coating is that the ingredients selected are cheap non-deficient materials available at each metallurgical enterprise. No additional grinding and screening costs are required. .

The granulometric composition of the granulated slag is 0.3 mm and is the result of t

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The presence of granulated slag up to 50% CaO ensures chemical interaction with liquid glass and the formation of silica gel, which allows the coating to harden quickly.

The zone of greatest formation of cracks is approximately 600-800 mm below the top of the bowl; here the sharpest temperature drop occurs.

Therefore, the minimum height of the coating should ensure the protection of this zone.

To reduce the consumption of the mixture, the coating is applied to a height equal to the level of filling the bowl with slag melt, which is usually 0.9 times the height of the bowl (the lower limit of the height of the coating 0.75 is due to the need to use the volume of the slag for slag). Slag bowls work under conditions of pronounced thermal shock, the temperature of the bowl wall before leaching varies from 150 to 300 ° C.

depending on the time of year. A sudden temperature change on the inner surface of the bowl due to the pouring of slag melt leads to the occurrence of high compressive

stresses that exceed the bowls allowed for the material. The proposed minimum coating thickness reduces the stress from thermal shock to the allowable

significantly increases the durability of the slag bowl.

It is most technologically feasible to apply the proposed coating by the method of gunning with gunning glue, which are available in open-hearth shops. The maximum thickness of the coating is determined by the volume of the shotcrete hopper. As a result of testing under industrial conditions

You dreamed that a full gun of the gunning unit allows you to apply a coating up to 12 mm thick, no more

Increasing the coating thickness leads to excessive material consumption.

and waste of time. In order to ensure reliable adherence of the protective coating to the inner surface of the slag-carrying bowl, they are made on the inner surface.

periodic recesses with a height of 0.05-0.1 thickness of the thicket. These cavities when gunning the bowl are filled with the mixture and at its freezing.

firmly hold the coating from eroding the slag and sliding it to the bottom of the bowl. When the coating is destroyed, the mixture is firmly held in the depressions and during subsequent coatings it increases the adhesiveness of the inner surface. The diameter and number of holes can be chosen constructively. Minimum height

Table 1

The content of ingredients, wt.% In a mixture Ingredients | j.,

.L ... i ...... L ... V..I .... L.

Transhlak7578807085

Liquid glass1011101510

Fire Clay 151110155

table 2

Shrinkage,% Fire stop- Amount of mixture, / Mixture, no.

 ..t TG W mr .. -IT YY - | nU

1812856

2512855

3512507 81280-. 5 5412408

Compiled by B. Rakovsky Editor N. Gorvat Tehred Z. Kastelevich Proofreader S. Shekmar

Order 611/31 Circulation 552Subscription.

VNISh State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PSh1 Patent, Uzhgorod, st. Project, 4

2112934

The recesses are determined from the condition that when applying the proposed coating thickness the holes are completely filled with the mixture and firmly held there. Increasing the depth of the deepening of more than 0, 1 bowl thickness is impractical because of the danger of burning the body of the bowl when metal enters the bowl and the protective coating is eroded.

Claims (2)

1. SLAG CARRYING CUP, comprising a body and a protective coating of the inner surface, characterized in that, in order to reduce costs and increase the resistance of the bowl, the protective coating is made of a mixture containing, wt.%: Granulated slag 75-80, refractory clay 10-15, liquid glass 10-15, a height of 0.75-0.9 bowl height. 2. The bowl according to claim 1, characterized in that on the inner wall of the housing are evenly spaced recesses with a depth of 0.05-0.1 thickness of the housing. é C © CO