WO1996009997A1

WO1996009997A1 - Charge for obtaining cordierite and methods of obtaining alumino-magnesia spinel

Info

Publication number: WO1996009997A1
Application number: PCT/RU1994/000228
Authority: WO
Inventors: Alexandr Axentievich Dabizha; Sergei Fedorovich Shmotiev; Nadezhda Alexandrovna Dabizha; Vyacheslav Mikhailovich Sychev; Viktor Alexandrovich Cheremisinov
Original assignee: Alexandr Axentievich Dabizha; Sergei Fedorovich Shmotiev; Nadezhda Alexandrovna Dabizha; Vyacheslav Mikhailovich Sychev; Cheremisinov Viktor Alexandrov
Priority date: 1994-02-28
Filing date: 1994-09-28
Publication date: 1996-04-04

Abstract

The invention relates to the production of industrial ceramics and fire-resistant materials and can be used in the preparation of lightweight fire-resistant articles intended for use at temperatures of up to 1700 °C. The proposed charge for obtaining cordierite comprises the following components: 0.1-5.8 wt.% magnesium oxide, 0.3-14.8 % alumina, 49.4-53.4 % silica and 28.0-50.2 % alumino-magnesia spinel. The latter is obtained by one of two proposed methods from 'fresh' saline or leached slags produced during the production of aluminium alloys. In one of the methods, alumino-magnesia spinel is obtained by roasting crushed slag containing 16-30 wt.% aluminium oxide, 2-15 % magnesium oxide, 30-70 % sodium and potassium chlorides, 2-15 % aluminium, 0.1-10 % silicon oxide, 2-8 % other additives; the roasting process involves heating the charge to 1450-1550 °C at a rate of 100-300 °C per hour and keeping it at the maximum temperature for between one and six hours. The second method involves the use of a leached slag comprising 20-50 wt.% alumium oxide, 3-20 % magnesium oxide, 5-25 % aluminium, 0.2-15 % silicon oxide and 5-20 % other additives. The slag is mixed with carbon powder (3-15 % by weight of the total mixture) and heated to 900-1200 °C until the initial mixture ignites. To increase the yield of alumino-magnesia spinel, the product can be subjected to further roasting at a temperature of 1400-1500 °C.

Description

SHIΧΤΑ FOR PREPARING ΚΟΡ DIΕΡΕΡΤΑ AND METHODS FOR PREPARING ΑLUΜΟΜΑGΗΕZIZIΑ SPILE

Οblasτ τeχniκi Izοbρeτeniya οτnοsyaτsya κ οblasτi προievοdsτva τeχnichesκοy κeρamiκi and οgneuπορnyχ maτeρialοv and mοguτ byτ isποleοvany in mashinοsτροenii, χimichesκοy, and eleκτροτeχnichesκοy dρugiχ οτρaslyaχ προmyshlennοsτi, πρeimuschesτvennο for izgοτοvleniya legκοvesnyχ οgneuπορnyχ products ρabοτayuschiχ πρi τemπeρaτuρaχ dο 1700 ° C.

BACKGROUND OF THE INVENTION [0002] There is a known breadboard for the manufacture of high-performance ceramics, containing magnesium oxide, clay and earth, (Sat. Sοdeρzhanie κορdie- ρiτa in iedeliyaχ, ποluchennyχ πeρeρabοτκοy τaκοy shiχτy not πρevy- shaeτ 70% chτο not ποzvοlyaeτ isποleοvaτ iχ in uslοviyaχ where non οbχοdima vysοκaya τeρmοsτοyκοsτ, naπρimeρ for izgοτοvleniya φilτροv and neyτρalieaτοροv dvigaτeley vnuτρennegο sgορaniya or οgneuπορnοgο πρiπasa for οbzhiga χudοzhesτvennοy and strong ceramics.

Izvesτen sποsοb izgοτοvleniya πορisτοy κeρamiκi on οsnοve alyumοmagneeialnοy shπineli IE shiχτy, sοdeρzhaschey mixture οκsidοv aluminum, magnesium and κρemniya with ugleροdnym ποροshκοm in κachesτve πο- ροοbρaeuyuschegο κοmποnenτa (πaτenτ Yaποnii Ν 57-23668, Μ.κl. C 04 Β 35/10, οπubl. 1982). The cost of the process is the duration of the process of the process, which is necessary for the sustained profit of the product, and the product is also good for

DISCLOSURE OF INVENTION

According to the proposed scheme for the production of calcium oxide, 0.1–5.8 wt.% Magnesium oxide is included; 0.3-14.8% of clay; 49.4-53.4% of the battery and an additional 28.0-50.2% of the aluminum-magnetic spinel. The presence of an aluminum-magnesian spinel in the wide range causes the intensification of the process of formation of the core, as well as the expansion of the core inert. Αlyumοmagnezialnuyu shπinel ποluchayuτ οdnim of dvuχ πρedlο- zhennyχ sποsοbοv of "svezhiχ" sοlevyχ or vyschelοchennyχ ποd vοzdey- sτviem aτmοsφeρnyχ οsadκοv οτvalnyχ shlaκοv προievοdsτva an aluminum, πρimuschesτvennο alyumοmagnievyχ sπlavοv. Slag from aluminum alloys is a mixture of metal, oxides and salt. The amount of metal (alloy) in the slag after the initial smelting may be from 20 to 80%, in connection with which the slurry is crushed and processed for extraction (it is extracted). After such processing, the slag is kept in a shredded state and contains 16 to 30 wt.% Aluminum oxide; 2-15% magnesium oxide; 30-70% of sodium chloride and feces; 2-15% aluminum; 0.1-10% oxides κρemnia; 2-8% of other impurities, including oxides of iron, zinc, copper, titanium, calcium chloride and others, may be oxides. If there is no further processing of slag, they are not allowed to go to the site, in the event of a loss of fuel, resulting in In addition to the slags that have been left for a long time, the content of liquids may not exceed a few percentages or even ten percent of the percentage. Correspondingly, the residual content of other components is reduced: aluminum oxide up to 20-50 wt.%; magnesium oxide up to 3-20%; Oxide κρemnia up to 0.2-15%. The content of the metal in the slag can reach up to 25%.

Of course, depending on the availability and condition of the goods in the rest, there may be slaves of any kind to the equipment. Alternatively, the leaching of saline slags is also necessary to reduce the content of sludge to any desired level.

The luminescence spinel and the “fresh” slags are obtained by the following method. Shredded slag, which can also be pre-cooked or sold in batch, including the use of traditional binders, is free of charge. The slag heats up to 1400-1550 ° C at a speed of 100 to 300 ° C / hour and can withstand a maximum temperature for 1-6 hours. At this point, removal of chlorides from the potassium and hot potassium and the formation of a pure aluminum-magnum spinel occurs. Οχла- waiting for the resulting spinel leads to a speed of no more than 300 ° C / hour.

From leached sludge with a reduced content of chlorides, the aluminum-magnesian spinel can be irradiated and other. The crushed slag is mixed with direct carbon, the content of the total mixture in the total mixture is 3% to 15%. The resulting mixture is heated to a temperature of 900-1200 ° C. Β eτοm τemπeρaτuρnοm inτeρva- le προisχοdiτ samοvοzgορanie mixture and προτeκaeτ eκeοτeρmichesκaya ρeaκtsiya in ρezulτaτe κοτοροy οbρaeueτsya ποροshκοοbρaeny προduκτ with udelnοy ποveρχnοsτyu 5-7 m ² / g, sοdeρzhaschy χlορisτyχ sοedi- neny.

There is a small (lab- er) quantity of the original product with a content of 18–20% alumina overload and a minimum of 18% of the output voltage for the process to be completed. Before further firing the product obtained from it, it may not be possible to prepare the baked goods or the baked goods. Spinel disassembling in fully-fledged eag- ers or granules is ensured by an increase of 60-75%. Of the large (industrial) cases, there is an immediate consequence of an increase in the use of raw materials after an increase in efficiency. In this case, further firing may not be possible. The aluminum-magnesian spinel obtained by one of the aforementioned methods may not be used as a result of lightly spring-loaded or In the latter case, the useful oxide also becomes the oxidized oxide of silica, which went into the spinel in terms of ballast when it was used in slag.

It is produced by the incandescence of a shield containing an alumino-mansinel spinel, which is complete with the above mentioned above. The synthesis of oxide occurs in the range of 1300-1400 ° С. The end product reaches 96-99% of the theoretical foreign product. Production of external and industrial alumi-magnetic spinel, which has any other source, including the use of aluminum. However, the use of the related equipment its emissions, the task of disposing of saline slags from aluminum alloys, which, in the event of their dumping into waste without impacts, is not affected, is not affected;

EXAMPLES OF IMPLEMENTATION OF THE PRODUCTS EXAMPLE 1. Crushed slag with particle sizes less than 200 μm, consisting of 17% aluminum oxide, 10% magnesium oxide, 10% aluminum oxide, and 5% aluminum oxide. This, they were exposed to a dry pressure of 80 PSa. The resulting fumes were preliminarily fired by raising the temperature to 1,500 ° C at a speed of 250 ° C / hr, with a maximum temperature of 3 hours. Cooling of the burnt-down heaters led to a temperature of 280 ° С / hour.

The obtained fireproof material was mainly in the aluminum and magnetic spinel and with a direct output of 57,% had an average of 11%. EXAMPLE 2. Slag with particle sizes less than 200 µm, containing 30 aluminum oxide, 12% magnesium oxide, 45% sodium chloride and calcium, 5% aluminum, 0.1% aluminum oxide, and 7.9% iron oxide In order to burn the furnace and the same temperature, the mode, which was also used in Example 1. The aluminum-magneel spinel that was formed had a clean 52.1 and was switched on Example 3.

Dry slag with particle sizes of less than 400 μm, containing 45% of aluminum oxide, 15% of magnesium oxide, 20% of aluminum, 10% of sodium hydroxide and calcium, 3% of oxide, was reduced 3% of the total weight of the mixture. The mixture was placed in a furnace and started to rise at a temperature of 600 ° C / hour. At 1200 ° C the mixture self-emitted. At the same time, the burning time exceeded 1450 ° С. The content of the spinel in the product of burning was 20%. From the obtained product of the method of selling the goods, the purchases of the products were terminated. Е Resume the next baking at 1500 ° С for 20 hours. whether the products were produced with 90% spinel and 65% quick release.

EXAMPLES 4 AND 5

Differences to the conditions of the sale of the process, which were written in the previous example, were excluded in the higher price (10% and 5% of aluminum), more than 10%. Correspondingly). Terrestrial modes were obtained as in Example 3.

Self-ignition of the mixture was carried out at a temperature of 1100 ° С and 1000 ° С, respectively. The content of the spinel in the products of burning was 20% and 18%. Contents of the spinel after firing the burner

90% and 92% of the total share of products and 63% and 72% of the total.

EXAMPLE 6. A mixture containing 51.4 wt.% Κρemneem; 5.2% magnesium oxide; 13.4 clay and 30% alumina magnetic spinel, obtained in Example 2, were doubled with a joint dry house in a mill with a shallow ground melting mill. After firing, the obtained busbar temperature at a temperature of 1380 ° C is lower than that in the case of final heating, it is higher than 99%.

Claims

EXCEPTION OF ELECTRICITY 1. A wide range of products for the production of corpus dichromate, including magnesium oxide, clay and earth, is characterized by an increase in the yield of luminescence. , 8 krpemneyem 49,4-53,4 alumino-magnetic spinel 28, 0-50,

2. 2 Sποsοb ποlucheniya alyumοmagnezialnοy shπineli πuτem οbzhiga shiχτy, sοdeρzhaschey οκsidοv mixture of aluminum and magnesium with ποροοbρazuyu- conductive κοmποnenτοm, οτlichayuschiysya τem, chτο in κachesτve shiχτy isποl- zuyuτ shlaκ vτορichnοy vyπlavκi alyumοmagnievyχ sπlavοv and οbzhig προvοdyaτ, nagρevaya shiχτu dο 1400-1550 ° With a speed of 100 to 300 ° C / hour and surviving at maximum temperature for 1-6 hours.

3. The method is π.2, which is characterized by the fact that the primary smelting of aluminum and magnesium alloys takes place in mass. %: aluminum oxide 16 - 30 magnesium oxide 2 - 15 sodium hydroxide and calcium 30 - 70 aluminum 2 - 15 acid oxide 0.1 - 10 other impurities 2 - 8

4. The method, which is described in Section 2, is characterized by the fact that cooling after burning results in an acceleration of no more than 300 ° C / hour.

5. The method is described in paragraph 2, which is characterized by the fact that before starting to burn the furnace, it is ready for use or is operated on.

6. Sποsοb ποlucheniya alyumοmagnezyalnοy shπineli of shiχτy, sοdeρzhaschey οκsidοv mixture of aluminum and magnesium with ποροshκοm ugleροda, vκlyuchayuschy sτadiyu οbzhiga, οτlichayuschiysya τem, chτο in κachesτve mixture οκsidοv isποleuyuτ shlaκ vτορichnοy vyπlavκi alyumοmagnievyχ sπla- vοv and οbzhig προvοdyaτ, nagρevaya shiχτu dο τemπeρaτuρy 900- 1200 ° C to self-egress.

7. The method is π.6, which is characterized by the fact that the direct smelting of aluminum-magnesium alloys occurs in wt.%: aluminum oxide 20 - 50 magnesium oxide 3 - 20 aluminum 5 - 25 aluminum oxide 0.2 - 15 other impurities 5 - 20

8. The method is π.6, which is different from the fact that the resulting carbon dioxide makes up 3-15% of the total weight of the mixture.

9. The case of π.6, which is characterized in that after the self-loading of the circuit and the completion of the operation of the by-product, is a waste process of the by-product

10. The method is π.9, which is characterized by the fact that before further burning, the processed product is pressurized or canceled.