PL154941B1 - Aluminium-silicate mixture for linings of induction furnaces, especially for aluminium and its alloys melting - Google Patents

Description

PATENT DESCRIPTION

154 941

Additional patent to patent No.-Pending: ⁸⁸ ! 2 30 / P. 277006 /

Priority _

Int. Cl. * C04B 35/66 C04B 33/22

READING ROOM 8 UP L H A

OFFICE

PATENT

RP

Application announced: ^{90 07 09}

Patent description published: 1991 12

Creators of the invention: Teresa Trochimowi.cz, Wanda Wołek-Orożdż, Oózef Konowol, Kazimierz Baścik, Roman Bałaj, Antoni Karpiński

The holder of the patent: Instytut Itateriałów Ognnotrzałych, Gliwice / Poland /

ALUMINOSILATE MASS FOR INSERTING INOUCTION FURNACES, ESPECIALLY FOR THE MELTING OF ALUMINUM AND 3EG0 ALLOYS

The subject of the invention is a hot melt for lining induction furnaces, in particular for melting aluminum and its alloys.

It is known to use various types of aluminosilicate masses in induction furnaces for aluminum melting, containing as a sintering component refractory clays in an amount of 20-4 (wt%, chemical binders, most often water glass and aluminum sulphate, and also phosphate binders).

The disadvantage of these masses is their insufficient strength and integrity, as well as the rapid deterioration of the linings due to fouling with aluminum reaction products (mta).

The aim of the invention is to provide an aluminosilicate compound for the lining of induction furnaces, which is characterized by high strength, good sinterability, non-wettability by aluminuum and resistance to fouling by reaction products of the sand components with aluminum.

M) are aluminosilicines for lining induction furnaces for melting aluminum and its alloys, according to the invention, contains scrap of technical porcelain or scrap of acid-resistant products with grain size 0-6 mm in the amount of 75-85% by weight, refractory clay in the amount of 5-10% by weight o grain size 0-1 mm, barite with a grounding of 0-0.1 mm in an amount of 8-12% by weight and a chemical binder, preferably sodium polyphosphate in an amount of 1-3% or aluminum phosphate in an amount of 3-10% by weight. The mass is made up of the amount of water needed to obtain the necessary for whipping the hairline, usually 0-5%, depending on the raw materials and chemical binder. The mass is added for 48-60 hours to homogenize it.

The advantages of the clayey clay according to the invention are high strength, good friability, moisture resistance to aluminuum and resistance to fouling by the reaction products of the sand components with aluminum.

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Example I. The aluminosilicate mass consists of: 85% by weight of scrap technical porcelain with a grain size of 0-6 mm, 5% by weight of refractory clay with a grain size of 0-1 mm of the "Zapnia" type, 10% by weight of flotated barite, 3% by weight of sodium polyphosphate per 100 % dry ingredients, 4% by weight of mixing water.

The mass has the following properties, which were determined on samples formed under a pressure of 0.2 MPa:

- ordinary refractoriness - 1350 ° C,

- refractoriness under the load of 0.2 MPa about 118O ^o C,

- ^GE hundred Apparent ^SC / after wysuszendLu /

- ^GE hundred Apparent ^SC / after wypał.eniu /

- compressive strength / after baking /:

- 1 « ⁴ 4 g / cm>

- at 1000CC -: ,, 13 g / mm ³

in temperature 110 ° C - 5.9 1 MPa, in this ^ eraturzz 440 ° C - 13.5 MP ^a , in t ee ^^ r ^^ l ^ device 660 ° - 16.2 MPa, in tempθraturzr 88,000: - 21.1 MPa, in this ^m θraturzr 1000 ⁰ ° - 22.4 MPa.

in this) peraturzr 1100 ° in this ^young eraturzr 4400 ° in 6600 ° in 8800 ° in tem ^m eraturzr 110,000 Unoiwra / after wyppłennu / in this ^young eraturzr 4400 ° in t eeperatuuzz 6600 ° in tee ^^ ret ^ u ^^ z 800 °° in tee ^^ r et ^ u ^^ z 10,000 (°

- open porosity / after baking /:

- 29,%

- 19%.

- twenty,%

- 20.1%.

- 18.5%.

- 0%,

- 0%,

- 0.1%.

- 0%.

Example II. The mass of carbonaceous cream consists of: 82% by weight of scrap of acid-resistant products of the KW-1 grade with a grain size of 0-6 mm, 10% by weight of refractory clay with a grounding of 0-1 mm of the Zapniów type, 8% by weight of flG ^ wmego barite, 8% g ^{o s} ^ s ^ ch furan aluminum ^g of density 1? ⁵ g / cm ³ to 100% of the components sucliych.

The mass has the following properties, which were determined on samples formed under a pressure of 0.2 MPa:

- ordinary refractoriness

- refractoriness under a load of 0.2 MPa

- ^GE hundred ^ity ipozorna / after wysuszeni.u /

- ^E S ^t g Apparent spear / po burnt at 1000 ° C /

- compressive strength / after baking /:

- 1350 ° C,

- around 1200 ° C,

- ^2, 06 ^g / cm

- ^{1, 93 g} / cm '

in ^t ^ perature 110 ° C - 15.3 MPa, in temperature 400 ° C - 11.2 MPa, in temperature 600 ° C - 12.1 MPa, in temperature 800 ° C - 12.2 MPa, in eem ^ a ^ r ^^ Rzzj 1000 ° C - 12.6 MPa, open / after falling /: in temperature 110 ° C - 14.1% in temperature 400 ^o C - 21.8%. in temperature 600 ° C - 22.7% in temperature 800 ° C - 22.2% in temperature 1000 ° C - 23.7%. æ ^ 000 * 8 / after baking /: «V temperature 400 C - 0.4%. in temperature 600 ¹ ^ - 0.1%. in temperature 800 ^o C - 0.4% in temperature 1000 ° C - 0.0%.

154 941

Claims (1)

Patent claim Alumina silica mass for the lining of induction furnaces, especially for melting aluminum and its alloys, composed of main aggregate ^ t ^^ zem ^^ r ^^, refractory clay and chemical binder, characterized by the fact that it contains scrap of technical porcelain or scrap of acid-resistant products with grounding 0-6 mm in the amount of 75-85% by weight, refractory clay in the amount of 5-l (% by weight with grounding 0-1 mm, barite with a grain size of 0 "O" 1 mm in the amount of 8-12% by weight and chemical binder , preferably sodium polyphosphate in the amount of 1-3% by weight or aluminum phosphate in the amount of 3-1C% by weight in relation to the dry ingredients and depending on the type of raw materials and binder 0-5% by weight of water, the mass being added through 48-60 hours. 154 941 Department of Publishing of the UP RP. Circulation 100 copies Price: PLN 3,000