DE281305C - - Google Patents

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-JVe 281305 - CLASS Mn. GROUP

Dr. A. CLASSEN in AACHEN /

It is known that colloidal metals of the platinum group can be obtained using sodium compounds of protalbic acid and lysalbic acid. Likewise are also colloidal gold solutions, using gelatin as a protective colloid, has been manufactured. However, all of these solutions are only stable if they are highly diluted. It has now been found that for the production of colloidal solutions of gold, silver, Platinum group metals. and other metals, especially in concentrated form, the gelatose is ideal. Under gelatose, for example, this is

! 5 less boiling of the gelatin with water was obtained To understand conversion product of gelatin. (Ernst Schmidt, detailed textbook, der pharmaceutical Chemie 2nd volume, 5th edition, Braunschweig 1911, p. 2164, paragraph 3.) The .Substanz is obtained by careful evaporation of the solution, advantageously in vacuo in the form of yellowish-white, shiny leaves. The gelatin opposite possesses Gelatose has the advantage of being soluble in water in any amount without affecting the solutions freeze. One has (German patent ■ script 163815) with the name »Gelatose« also called conversion products of the glue with acids or alkalis. Of this Body is known to be a silver compound. But it is not colloidal silver. the Gelatose used in the present process is also applicable to some metals, z. B. gold, a reducing agent, so that the reduction and conversion in the colloidal State is to be carried out by the same means in one operation. One can after the present method add the gelatose both in solid form to the metal solution, as well as directly apply the solution initially created during the presentation. Instead of gelatine, glue is also used to make gelatose, ζ. Β. Bone glue, Isinglass to use.

The production of the colloidal platinum metals i.a. happens either in such a way that one the metals are reduced in the presence of the gelatose or the metal is reduced separately and then add gelatose as a protective colloid. In those cases where gelatose itself acts as a reducing agent, e.g. B. with gold, is the use of a separate one Reducing agent unnecessary. One can also use the metal in some way, e.g. B. by electrical atomization, or by mechanical crushing and etching, in the colloidal Transfer state or approach it and then add the gelatose.

The method is generally applicable to heavy metals ■ which form colloids, z. B. for gold, silver, the various platinum metals, the earth metals such as cerium, lanthanum, Didym, thorium, also suitable for tungsten, molybdenum, uranium, titanium, niobium. This is a particular benefit of gelatose.

To prepare the colloidal metal solutions one can proceed in such a way that one Gelatose of a boiling solution of redu-

Claims (4)

addable metal salt solutions. The solution can be used directly, but also dried, z. B. be evaporated, with indifferent, serving as a carrier of the colloidal metal substances can be added. Example i. 0.13 g platinum, e.g. B. in the form of platinum chloride, 100 g of boiling water are mixed with 2 g of gelatose and a drop of hydrazine hydrate. One steams to the desired Concentration one. Asbestos can be added to the solution before or during evaporation. In this In this way, the asbestos is coated or impregnated with colloidal metal. Any other organic or inorganic substance can be used instead of asbestos use, e.g. B. sawdust or kieselguhr. Depending on the material, one dries and glows or just let it dry. The precipitation of the colloidal solutions by inert substances is surprising because It could not be foreseen that the indifferent substances would act like a crystalloid would. The simple coating of the indifferent substances with the colloidal metals permitted, contact bodies with the properties peculiar to colloids without difficulty of the covering material. They are more effective than ζ. Ξ>. Platinum asbestos. if if the gelatose in the contact bodies is destroyed by glowing, this still shows up particular advantage of gelatose that ashing goes on very easily while this is more difficult with gelatin, sodium protalbinate and sodium lysalbinate. The won Contact bodies are free from additives such as sodium carbonate. Formic acid, formaldehyde and similar reducing agents can also be used. Example 2. 0.05 g gold, e.g. B. in the form of gold chloride, 100 g of water are boiled with 2 g of gelatose, as a reducing agent and protective colloid. It is evaporated to dryness at the boil. The residue is crimson Color soluble in water. A particular advantage of using gelatose is that you can use with their help metals which cannot easily be obtained colloidly from the solutions of the salts can, such as B. chromium, silicon, molybdenum, uranium, tungsten, manganese, in the colloidal or can convert a similar finely divided form. This is also possible for alloys, such as ferrochrome, chrome steel, ferrosilicon-ferromanganese, manganese steel, ferrochrome molybdenum, Chrome-nickel, chrome-nickel steel, silicon-> carbide, silicon nitrogen, titanium nitrogen and others. The metal or the alloy is either crushed as finely as possible, where you can also use an etching with acids and bases, and then combined with gelatose, or you can chop it up the fabric together with gelatose. 70 Example 3. Add 200 g of chromium (molybdenum, tungsten, silicon, ferrochrome, ferrosilicon, etc.) with ι 1 an oil percent gelatin solution and the necessary number of steel balls in a ball mill and sets the metal, etc., longer Time, e.g. B. several days or weeks, the crushing effect. In the end the gelatose turns into a foam-like mass, the consistency of which depends on the concentration depends on the gelatose solution used. With this mass one can identify indifferent carriers, such as asbestos, kieselguhr, pumice stone and the like. The mass contains besides colloidal Iron coming from the steel balls, the treated metal or alloy or their components in finely divided and partly in colloidal form. If you have the Substances soaked with the foam-like mass for the purpose of destroying the gelatose glows or heated, you get in asbestos. in addition to iron oxide, the metals or the constituents of the applied alloys in finely divided form. The iron oxide contributes to that other metals finely distributed in the indifferent carrier, and offers the Advantage of also acting as a catalyst in contact reactions. When using alloys that contain nickel, tungsten and uranium, arise Nickel oxide, oxides of tungsten and uranium, which include the finely divided metals, thus act as a distributor and at the same time exert contact effects. You can glow the gelato foam without an indifferent carrier and then get it a contact body in which the iron oxide and other oxides both as a carrier as act as a catalyst. The colloid dissolved metal, e.g. B. no Chromium, of course, remains in finer division than the main amount. If, instead of the steel balls, balls made of a non-metallic material, z. B. granite, is used to avoid the ingress of colloidal iron into the colloidal metal. Patent-A ν Proverbs: i. Process for converting metals and metal alloys into finely divided Form, characterized in that one Gelatose, the conversion product obtained by boiling with water for a long time of the glue, used as a protective colloid. 2. Embodiment of the method according to claim i, characterized in that that one reduces metal salt solutions in the presence of gelatose. 3. Embodiment of the method according to claim 1, characterized in that that one metals, metal alloys or metal compounds mechanically, possibly using an etching process crushed and put together with gelatose. 4. embodiment of the method 'according to claim 1 to 3, characterized in that that one adds indifferent substances to the mixture.