PL136847B1 - Method of manufacture of sintered corundum - Google Patents

Method of manufacture of sintered corundum Download PDF

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Publication number
PL136847B1
PL136847B1 PL23960382A PL23960382A PL136847B1 PL 136847 B1 PL136847 B1 PL 136847B1 PL 23960382 A PL23960382 A PL 23960382A PL 23960382 A PL23960382 A PL 23960382A PL 136847 B1 PL136847 B1 PL 136847B1
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PL
Poland
Prior art keywords
weight
micrometers
mass
grain size
alumina
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PL23960382A
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Polish (pl)
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PL239603A1 (en
Inventor
Mieczyslaw Mularczyk
Jurand Bocian
Zbigniew Kopczynski
Stanislaw Mikolajczyk
Marian Spirydowicz
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Zarowskie Zaklady Materialow O
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Priority to PL23960382A priority Critical patent/PL136847B1/en
Publication of PL239603A1 publication Critical patent/PL239603A1/en
Publication of PL136847B1 publication Critical patent/PL136847B1/en

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Description

Przedmiotem wynalazku jest sposób wytwarzania korundu spiekanego o wysokiej czystosci.Znany jest z opisu patentowego PRL Nr 93 066 sposób wytwarzania korundu spiekanego, wedlug którego techniczny tlenek glinu rozdrabniany jest do uziarnienia do 60 mikrometrów, przy czym zawartosc ziaren do 5 mikrometrów wynosi co najmniej 60% wagowych. Nastepnie mie¬ szany z woda, a powstala mieszanina przeprowadzana jest w prózniowej prasie pasmowej w zwarta zageszczona mase plastyczna. Pasmo masy przecinane jest na bloczki lub brykiety, które wypa¬ lane sa w piecu okresowym, tunelowym lub szybowym w temperaturze 1650 do 1750°C. Uzyskany pro¬ dukt koncowy posiada porowatosc otwarta od 1 do 4%, zawartosc AlgO^ od 98 do 9B,5# i slady zawartosci SiOp. Czystosc chemiczna korundu zblizona jest do czystosci surowca wyjsciowego, to jest technicznego tlenku glinu* Wada znanego sposobu jest niska gestosc uzyskiwanego korundu wynoszaca srednio 3*60 g/cm3 Posiada on równiez slabo wyksztalcone i o niewielkich wymiarach ziarna AlgOy Ziarna te nie posiadaja wymaganego ksztaltu plytkowego* Wielkosc ziaren alfa A12°3 **¦• przekracza 200 mikro¬ metrów, a ich ksztalt zblizony jest do szescianu. Jednoczesnie ziarna sa nieprawidlowo ulozo¬ ne wzgledem siebie, zawartosc ziaren alfa A1203 oznaczona rentgenograficznie wynosi przeciet¬ nie 90%.Istota rozwiazania wedlug wynalazku jest sposób, w którym do tlenku glinu i/lub wodoro¬ tlenku glinu o uziarnleniu do 60 mikrometrów zawierajacego do 60% wag* ziaren ponizej 5 mikro¬ metrów wprowadzany jest jako katalizator chlorek amonowy IH ci, korzystnie w postaci wodnego roztworu o stezeniu 10 do 30% wagowych w ilosoi niezbednej do uzyskania plastycznosci masy.Uzyskana masa jest zageszczana, nastepnie cieta na bloczki lub brykiety, suszona i wypalana.ZaJeta rozwiazania wedlug wynalazku jest uzyskanie korundu spiekanego o gestosci minimum 3,90 g/om3. Wielkosc krysztalów wynosi od 300 do 600 mikrometrów, przy czym posiadaja one ko-2 136 847 rzystny ksztalt plytkowy. Zawartosc ziaren alfa AlgCU oznaczana rentgenograficznie wynosi 100%. Czystosc chemiczna uzyskanego korundu spiekanego Jest zblizona do czystosci surowców wyjsciowych.Przyklad I. Mieszano 75% wagowego technicznego tlenku glinu o uziarnieniu poni¬ zej 60 mikrometrów i 25% wagowych wodnego roztworu chlorku amonowego o stezeniu 20% wagowych suchego chlorku amonowego. Mieszanine zageszczano w prózniowej prasie palmowej, nastepnie cieto na bloczki o wymiarach prostki normalnej» suszono do wilgotnosci ponizej 1# i wypalano w temperaturze 1750°C.Otrzymywano korund spiekany o wlasnosciach: gestosc 3,91 g/csr, zawartosc A1«0^ 98,8%, wielkosc krysztalów alfa AlgO^ 400 mikrometrów, zawartosc alfa Al^O^ 100%* Przyklad II. Mieszano 70% wagowych technicznego wodorotlenku glinu o uziarnieniu do 60 mikrometrów i 30% wagowych wodnego roztworu chlorku amonowego o stezeniu 15% wagowych suchego NH-C1. Mieszanine zageszczano w prózniowej prasie pasmowej i cieto na bloczki o wymia¬ rach prostki normalnej. Bloczki suszono do wilgotnosci ponizej 1% i wypalano w temperaturze 1700°C.Wlasnosci otrzymanego korundu spiekanego* gestosc 3,93 g/cm , zawartosc Al^O^ 99,3%, wielkosc krysztalów alfa Al20o 500 mikrometrów, zawartosc alfa AlgO^ 100%.Zastrzezenia patentowe 1. Sposób wytwarzania korundu spiekanego przez wypalanie w temperaturze od 1650 do 1750°C wysuszonych do wilgotnosci do 2% bloczków cietych z pasma zageszczonej w pasmowej prasie próz¬ niowej masy sporzadzonej z mielonego tlenku glinu o uziarnieniu do 60 mikrometrów, zawieraja¬ cego do 60% wagowych ziaren o wielkosci ponizej 5 mikrometrów i wody, znamienny tym, ze masa sporzadzana jest z technicznego tlenku glinu i/lub wodorotlenku glinu z dodatkiem ka¬ talizatora w postaci chlorku ejsionowego HELCI. 2. Sposób wedlug zastrz. 1, znamienny tym, ze chlorek amonowy NH.C1 dodaje sie w postaci wodnego roztworu o stezeniu od 10 do 30% wagowych KH.C1.Pracownia Poligraficzna UP PRL. Naklad 100 cgz.Cena 100 zl PLThe subject of the invention is a method of producing high-purity sintered corundum. A method for producing sintered alumina is known from the Polish Patent No. 93 066, according to which technical aluminum oxide is ground to a grain size of 60 microns, with the grain content of up to 5 microns being at least 60% by weight. Then it is mixed with water, and the resulting mixture is transferred into a compact, concentrated plastic mass in a vacuum strip press. The mass of mass is cut into blocks or briquettes which are fired in a batch, tunnel or shaft furnace at a temperature of 1650 to 1750 ° C. The resulting end product has an open porosity of 1 to 4%, an AlgO ^ content of 98 to 9B, 5% and traces of SiOp content. The chemical purity of corundum is similar to the purity of the raw material, i.e. technical alumina * The disadvantage of the known method is the low density of corundum obtained on average 3 * 60 g / cm3 It also has poorly formed and small grain size Algae These grains do not have the required plate shape * The size of alpha grains A12 ° 3 ** ¦ • exceeds 200 microns and their shape is close to a cube. At the same time, the grains are incorrectly arranged in relation to each other, the content of alpha Al2O3 grains determined by X-ray is on average 90%. The essence of the solution according to the invention is a method in which aluminum oxide and / or alumina with a grain size of up to 60 micrometers containing up to 60 % by weight of grains below 5 microns, ammonium chloride IH ci is introduced as a catalyst, preferably in the form of an aqueous solution with a concentration of 10 to 30% by weight in an amount necessary to obtain plasticity of the mass. The resulting mass is compacted, then cut into blocks or briquettes, dried and fired. The solution according to the invention is to obtain sintered corundum with a minimum density of 3.90 g / m3. The crystals range in size from 300 to 600 micrometers and have a favorable lamellar shape. The content of alpha grains of AlgCU determined by X-ray is 100%. The chemical purity of the obtained sintered alumina is similar to that of the starting materials. Example I. 75% by weight of technical alumina less than 60 microns in size and 25% by weight of aqueous ammonium chloride solution with a concentration of 20% by weight of dry ammonium chloride were mixed. The mixture was concentrated in a vacuum palm press, then cut into blocks with the dimensions of a normal section, dried to a humidity below 1 # and fired at a temperature of 1750 ° C. Sintered corundum was obtained with the following properties: density 3.91 g / csr, A1 content <0 ^ 98 , 8%, size of alpha crystals of AlgO ^ 400 micrometers, content of alpha Al ^ O ^ 100% * Example II. 70% by weight of technical aluminum hydroxide, grain size up to 60 micrometers, and 30% by weight of aqueous ammonium chloride solution with 15% by weight of dry NH-C1 were mixed. The mixture was concentrated in a vacuum strip press and cut into blocks having the dimensions of a normal section. The blocks were dried to a humidity below 1% and fired at a temperature of 1700 ° C. Properties of the obtained sintered corundum * density 3.93 g / cm, content Al ^ O ^ 99.3%, size alpha Al20 crystals 500 micrometers, alpha AlgO content ^ 100 Claims 1. The method of producing sintered alumina by firing at a temperature of 1650 to 1750 ° C, dried to a humidity of up to 2% of cut blocks from strand compacted in a strip vacuum press mass made of ground alumina with grain size up to 60 micrometers, With up to 60% by weight of the grain size less than 5 micrometers and water, characterized in that the mass is made of technical aluminum oxide and / or aluminum hydroxide with the addition of the HELCI inionic chloride catalyst. 2. The method according to claim The method of claim 1, characterized in that the NH.C1 ammonium chloride is added in the form of an aqueous solution with a concentration of 10 to 30% by weight of KH.C1. Pracownia Poligraficzna UP PRL. Mintage 100 cgz Price PLN 100 PL

Claims (2)

Zastrzezenia patentowe 1. Sposób wytwarzania korundu spiekanego przez wypalanie w temperaturze od 1650 do 1750°C wysuszonych do wilgotnosci do 2% bloczków cietych z pasma zageszczonej w pasmowej prasie próz¬ niowej masy sporzadzonej z mielonego tlenku glinu o uziarnieniu do 60 mikrometrów, zawieraja¬ cego do 60% wagowych ziaren o wielkosci ponizej 5 mikrometrów i wody, znamienny tym, ze masa sporzadzana jest z technicznego tlenku glinu i/lub wodorotlenku glinu z dodatkiem ka¬ talizatora w postaci chlorku ejsionowego HELCI.Claims 1. A method of producing sintered alumina by baking at a temperature of 1650 to 1750 ° C, dried to a humidity of up to 2% of strand cut blocks compacted in a strip vacuum press of a mass made of ground alumina with a grain size of up to 60 micrometers, containing up to 60% by weight of the grain size less than 5 micrometers and water, characterized in that the mass is made of technical aluminum oxide and / or aluminum hydroxide with the addition of HELCI inionic chloride catalyst. 2. Sposób wedlug zastrz. 1, znamienny tym, ze chlorek amonowy NH.C1 dodaje sie w postaci wodnego roztworu o stezeniu od 10 do 30% wagowych KH.C1. Pracownia Poligraficzna UP PRL. Naklad 100 cgz. Cena 100 zl PL2. The method according to claim A process as claimed in claim 1, characterized in that the ammonium chloride NH.C1 is added as an aqueous solution with a concentration of 10 to 30% by weight of KH.C1. Printing workshop of the UP PRL. Mintage 100 cg. Price PLN 100 PL
PL23960382A 1982-12-16 1982-12-16 Method of manufacture of sintered corundum PL136847B1 (en)

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PL23960382A PL136847B1 (en) 1982-12-16 1982-12-16 Method of manufacture of sintered corundum

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PL23960382A PL136847B1 (en) 1982-12-16 1982-12-16 Method of manufacture of sintered corundum

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PL239603A1 PL239603A1 (en) 1984-07-30
PL136847B1 true PL136847B1 (en) 1986-03-31

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