SU1353758A1 - Method of obtaining resin-bound refractory articles,mainly for converters - Google Patents

Abstract

The invention relates to the production of groundless unburned refractory products used for lining steel-making converters. The purpose of the invention is to increase the content of residual carbon and its uniform distribution in articles. Refractory products are obtained by mixing the prepared mixture with a heated liquid resin binder, cooling to the solidification temperature of the total volume of the resin binder, followed by mixing with the addition of benzene polymer in an amount of 1–6 wt.% With a viscosity of 80–140 s. , compaction and roasting. The content of residual carbon after coking roasting is 10.3-11.9%. 1 tab. I (L

Description

one

The invention relates to the production of re-molded unburned refractory products used for lining steel-making converters.

The purpose of the invention is to increase the content of residual carbon and its uniform distribution in products.

The preparation of the refractory mass is carried out as follows.

50% of the resin heated to temperature (60-140 ° C) of the resin bond is mixed with a large refractory material until the surface is completely covered. Next, refractory material is ground into the mixture and the remaining 50% of the resin bond. After thorough mixing, the refractory mass is cooled to the solidification temperature of the entire volume of the resin bond. The prepared refractory mass is grains of a large refractory material, partially impregnated, and coated with a film of resinous binder. Fine ground material, which in turn is impregnated, is adsorbed on the surface of the resin bond film.

It is applied and coated with an additional layer of resin bond. In order to fix and stabilize the uniform distribution of the refractory resin coating over the entire surface of the large grains of the refractory material, it is cooled. The prepared refractory mass does not have large grains that have not been rolled by the refractory resin coating. Such a refractory mass can be stored for a long time without being subjected to hydration (during

dolomite, dolomite magnesite The shelf life of manufactured isdemagnesitodomite 5 magnesite products according to the proposed method is from goods).

firing the converter lining - Before usto; not less (8 months), cooled cooked refractory; in making the lining, the converting mass is mixed and polygg pa is introduced the most important operation of the benzene separation; drying and firing. When the polymer is a highly aromatic lining in the unburned fire product, the benzene support starts to form and the formation of a division is obtained from the regeneration of the carbon binder. Ready made absorbent oil. The composition of polymeggens, which are ufacified, depends on the working conditions of the regenerated multi-layered rator grains and can be quite a lot of refractory filler, riated. The polymer has the following surface of which is coated with a thin characteristic: a layer of benzene polymer

five

0

Density at

g / cm

Ash content,%

Sulfur content,% free

common

l

Start Distillation

1.12 - 1.75 .0-0-0.3

boiling, С up to 160 ° С,% Residue above 300 С,%

0.1-0.2 2.0-3.0 124-290 1.0-5.0 50-60

The polymer contains a large number of components. The main ones are:

Boiling point temperature

o Fluoren

0 Diphenylene oxide Azentaften Dimethylnaphthalene Naphthalene

Tetralin

Methylstyrene

Toluene

Xylene

Inden

five

297.9 285.1 276.9 262.0 217.9

110-183.0

%

5-30 10-30

5-25 10-15 10-20

0 steel- new

burry wives

The elemental composition of the polymer is in the following range,%: C 86.0-88.0; And 5.5; N 1.0-3.0; about 1.753.0; S 2.0-3.0.

burry wives

The molecular weight is 350-500. In s-, polymer bone at 25 С - 80-140 s.

A thin layer of polymer covers a multi-layer, formed surface of coarse-grained grains. A polymer-grain polymer at the expense of gliding between itself during pressing ensures maximum packing density.

nor. In the composition of the polymer SODE1) hats 10-55% of acetonaphene HjC С HZ

and flourena

which in i

They are the main sources of polymer products. Calcination is carried out in a reducing environment with a slow rise to the onset temperature. maximum gas gap 323-342 ° C. Such a firing regime due to polymerization of acenaphthene, fluorene (an increase in the molecular weight of the polymer) and incomplete oxidation of carbon allows to obtain a coke skeleton on the surface of multi-layered grains of a large refractory aggregate before carbon formation in the refractory resin the coating of grains, which occurs at 400-550 s. In order to intensify the polymerization process and create a durable coke skeleton, vulcanizing agents can be introduced on the surface of the multi-layered grains of large refractory aggregates,

for example, xanthan hydrogen

. ..N NH S-- o;

widely used

in the tire industry, in an amount of 0.2-2% by weight of the benzene polymer.

At 400-550 C, the coke formation process takes place in a refractory resin coating, and this process reveals the effect of pores, i.e. binder tar undergoes closed coking, which drastically reduces the mass loss and increases the residual carbon content.

The proposed method for producing refractory molded products, mainly for converters, by cooling to the solidification temperature of the entire volume of the resin bond and the additive, with stirring, 1-6 wt.% Of the benzene polymer of viscosity 80-140 s, allows to obtain large refractory grains. filler with multi-layered refractory resin

coating, on the surface of which there is a film of polymer. Low-temperature calcination in a reducing atmosphere at a temperature of up to 342 ° C as a result of polymerisation of the polymer components leads to the formation of a carbon screen prior to the start of coke formation in the refractory resin coating. With an increase in temperature, coke formation in the refractory resin coating occurs in an enclosed space, which leads to an increase in the residual carbon

in resin bond.

The main reason for the lining wear of converters from refractory refined products is the oxidation of residual carbon obtained after calcination of the products in a reducing atmosphere with oxygen from the slag and the gas atmosphere, infiltration of the slag into the decarburized layer. Thus, the increase in content

carbon bond - residual carbon in products increases the flexibility of the structure and, despite some decrease in strength, leads to an increase in the durability of the lining.

Example. The raw material used is cured dolomite powder, g of sintered magnesite powder and prepared coal tar, the recipe and fractional composition of the charge is the following wt.%: Dolomite sintered fraction of 5-1 mm55. Magnesite sintered (fractions 0.088)

Prepared resin (100%) 6 The dolomite powder heated to 75 ° C is charged to the heated mixer. Where to add 50% of the required 6% by weight of the prepared resin heated to 130 ± 10 ° C is added. The mixture is thoroughly stirred for 5-6 minutes until the dolomite grains are completely coated with resin. Next, the magnesite powder heated to 75 ° C is fed to the mixer, mixed for 5-6 minutes until dolomite resin grains are coated with magnesite powder, then the remaining 50% of the resin is added and mixed for 5-8 minutes. After mixing, the mass is discharged from the mixer and cooled to solidify the entire volume of the resin bond. Cooked cool

The dented mass does not contain non-rolled refractory-resin coating of dolomite grains. Before compaction, the cold mass is loaded into the concrete mixer and stirred for 3-5 minutes. Next, the benzene separation polymer is added in an amount of 4 wt.% With a viscosity of 110 Сe is mixed for 3-8 minutes. The prepared refractory mass of the exhaust is routed into the receiving hopper of the press and pressed in a cold state. Manufactured refractory refractory products enter the converter shops for the converter lining. The firing of the refractory refined products is carried out in a converter in a reducing atmosphere.

The table shows the physicochemical parameters of ground refractory products manufactured according to the proposed and known methods.

The use of the proposed method of obtaining - refined refractory products, mainly for converters, due to an increase of 1.7-1.9 times in comparison with lime density. products9 freshly pressed

: i, 02. 2.99 3.05

after coking firing

Porosity of 5% freshly pressed products is open.

after coking firing

2.84 2.86 2., 82 2.89 2.87 2.87 2.85

2.2 2.2 2.25 2.3 2.35 2.45 2.35 7., 92 7.98 8.2, 8.6. 8.25 8.3 8.7

Residual carbon content after

Coking firing- 10.8 10. ,, 65 10.3 11.4 11.9 11.8511.8 ha,%

VNIIPI Order 5665/22

Random polygons pr-tie5 g, Uzhgorod st. Project 4

Residual carbon content and its uniform distribution in the products allows reducing the corrosive and erosive effects on the lining, thereby increasing its service life by a factor of.

U5

Claims (1)

Invention Formula The method of preparing refractory refined products primarily for converters, including preparing a refractory charge, mixing it with a resinous binder, heated to fluid temperature, compaction and roasting, characterized in that, in order to increase the content of residual carbon and evenly distribute it in the products, the refractory mass after mixing is cooled to the temperature of solidification of the total amount of resin, and before compaction it is mixed and the benzene polymer is added in an amount of 1-6 wt.% with a viscosity of 80-140 seconds. 0 five 2.96 2.79 3.14 6.3 Circulation 588 Subscription