DE518204C - Extraction of water-soluble aluminates - Google Patents

Description

Obtaining water-soluble aluminates The subject of the invention is a process for the production of water-soluble aluminates. The novelty of the invention consists in the fact that in the production of pig iron in the shaft furnace in the latter sodium compounds, z. B. soda introduced. It is thereby achieved that these sodium compounds in the shaft furnace interior (blast furnace interior) already during the formation of the slag and from the moment the slag is formed, it continues to be in the most effective way act on the slag. Substances that can be used as starting materials are: in which silica is bound to alumina, for example high silica Bauxite and aluminum silicates.

The addition of a sodium compound in the blast furnace process is earlier has been proposed before, but only for the purpose of achieving one particularly easily meltable slag, so with a completely different objective than with Process of the invention and accordingly also in unsuitable amounts for the new purpose. It was also known that water-soluble alkali aluminates were or to produce potassium compounds with the addition of iron oxide, but only in one only this one-purpose sintering process, either in an open flame furnace or in closed muffles with almost red heat and without a complete implementation required melting should take place. One such procedure is out of those mentioned Establishing is usually uneconomical from the outset and has not become naturalized can.

Finally, it has already been suggested in a special, to the blast furnace process subsequent process, at best a Part of the inherent heat of the resulting slag could be used; Slag to be fritted together with additives of lime and alkalis or in a special one Sintering process Slag as a digesting agent for naturally occurring high alumina To use fabrics. These suggestions, which are also of no practical importance have attained the disadvantage that no thorough melting and Mixing of the brought together substances comes about without which the process only remains imperfect and uneconomical .. In addition, this demands well-known Suggestion usually a special fuel expenditure in addition to the fuel expenditure of the shaft furnace even if the sintering process directly affects the shaft furnace connects.

The new process expediently makes use of the known possibility of binding the silica .as ferrosilicon, as is the case with the digestion of alumina-containing substances as part of a process for the manufacture of Möller for 100 kg of ferro-silicon Analysis in moisture: Fe Mn PS SiO; A1.0 ## Ca0 MgO H2 O annealing loss Rubio silicon ....... 44.89 0 75 24.1 0,050 .0,030: 0 2.3 0 0.50 0.30 1 5,8o, 60 Welding slag ...... 50.00 - 0.100 0.050 29.00 1.50 - - - - Abandonada ......... 5o, 75o, 62 0.051 0.040 7.88 1.33 0.25 - 5.42 10.7 Roller sintering ....... 65.00 - 0.100 0.030 3.00 - - - 6.0o - Wash mountains. . . ... ... 4.90 0.8o o, o6o 0, o60 48.00 30.00 - - 8.00 3.0 Limestone. . . . . . . . . . 0.7o - - - 1.00 2.00 52.00 2.00 0.50 4 = .00 Na2C03 ............ - - - - - - - - - 41.50 Coke ............... 1.7o - o, o3o 1, ooo 2.00 3.00 3.50 1.00 7.00 2.00 Use analysis Really useful Use of dusting Use of the ferrosilicon of the slag % Ö In o, # 0 % 0% Rubio silicon ....... 29.3 12.5 31.5 84.835 Fe 4.26 Fe0 Welding slag ...... 11.7 7.5 13.3 o.88 Mn 0.46 MnO Abandonada ......... 5.8 10.0 6.5 12.60 Si 30.20 SiO2 Roller sintering. . . . . . . 2.9 12.0 3.2 0.139 P 18.5o A1203 Wash mountains. . . . . . . . . 11.7 10.0 13.0 0.06 S 30.40 Ca0 Limestone. . . . . . . . . . . 17.6 10.0 1915 1.60 C 3.12 Cas Na2C03. . . . . . . . . ... 21.0 50.0 1.3.0 - 2.76 Mg0 100.0 - 10o, 0 Coke. . . . . . . . . . . . . . - - - - i 0.35 Na 2 O Recovery from the ores. . . . . . . . . . . . . . . 50.70 °; O Yield from the Möller .............. 25.50% Coke consumption for ioookg ferrosilicon .. i65okg. Rubio silicon. is a Spanish brown iron stone that contains a lot of silica. Of course you can also use any other ore that is high in silica. The silica is therefore necessary to to be able to reduce enough Si from it. A bandonada is also a Spanish brown iron stone of better quality, namely the pebble acid content relatively low, another ore can also be used for this. Wash mountains are generally understood to mean the waste from coal processing. Here is ins- special to understand that as much slate-containing constituents in the specified Möller should be included. position of Azotierprodukte has already been proposed, which are to be processed on clay and ammonia.

The new method provides a counterbalance to all known proposals the progress that it works without any special fuel expenditure and anyway is carried out at the same time at higher temperatures, at which under constant best mixing in a thin liquid state the most favorable conditions for the intended implementations are given. The new procedure is therefore twofold Reason because of the lack of special fuel consumption and because of the higher output superior to the known proposals.

A tried and tested example is provided to explain the new process attached, the details of which have been put together as a table for the sake of clarity are.

When carrying out the new procedure, one has to ensure that the the Möller z. B. added silicic acid-rich bauxite or the aluminum silicates suitable sodium compounds, advantageously soda, in such proportions find that the resulting slag consists of water-soluble or weakly alkaline Liquid soluble alumina in the form of Na Al O., as well as the rest in the main consists of #sodium calcium silicate. Any losses of sodium compounds that by evaporation are from the outset due to minor safety additives of sodium compounds to be considered.

The sodium-containing compounds can be used directly with the Möller to be abandoned. But they can also be completely or partially charged to the blast furnace feed in a lower part of the furnace shaft or in the frame, at the same time, any other surcharges are also introduced can.

As examples of the new process, Möllerverbindungen the following types are named: alumina silicates, clay iron stones, plagioclase stones (Isomorphic mixture of Na Al Sig 0 "and Ca A12 you 0J, scrap or any iron ore as well as so much soda and / or other sodium compounds (taking into account any Evaporation levels), as is necessary for the formation of sodium aluminate. An Indian Usually required limestone addition is to be regulated in such a way that just a calcium silicate arises.

The process can take the appropriate form instead of iron-producing Blast furnace can also be used analogously in the remelting dome furnace.

The shaft furnace used for the process is at least expedient delivered with carbon stones on the parts exposed to alkali attack, because when using refractory stones feared the dissolving effect of the alkalis must become.

The blast furnace slag produced in accordance with the invention forms for this reason From the outset a particularly valuable product because it, without any requires metallurgical or cumbersome chemical processing, clay contains in soluble form. This can easily be done by dissolving the ground slag can be obtained in hot water or in caustic soda, one of which is for this purpose known methods can be applied. It is also recommended for relief this aim is to granulate the slag flowing out of the furnace. where instead of water Water containing sodium hydroxide can also be used. Granulation can also be used here precede any necessary grinding. When leaching the slag the countercurrent principle can be used to a large extent to enrich the solution will.

If done correctly, taking into account the given gaits Choosing the additives, it can be achieved that the remaining, insoluble slag fractions form a valuable raw material for glass production, as a rule contains only small amounts of iron oxide and manganese oxide.

Claims (1)

PATEN TANSPRUCII Process for the production of water-soluble aluminates, characterized by the addition of sodium compounds, for example soda, in the production of pig iron in a shaft furnace (blast furnace).