DE1671051B1 - Process for the production of balls from refractory materials that are difficult to aggregate - Google Patents

Description

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the possibility of an easy removal of the alkali can react or the oxide formed without dislocation unchanged in the spheres formed by simple washing or by thermal decomposition is to be considered. can stay.

Without restricting the choice of alkali, the following examples illustrate the invention,

lent pointed out that ammonia especially 5 _TT ",,.

is expedient since it is known to be easy to use in the manufacture of spheres from hexavalent uranium

and by washing as well as by decomposing It is obtained by adding in the specified order

Any compounds formed can easily be recovered an aqueous solution prepared, the following one

is distant. Components contains: uranyl chloride or uranyl

With the method according to the invention folio nitrate solution with a pH = 1.30 percent by volume

The following advantages are achieved: propylene glycol per unit volume of the solution, 1

",,." ,, .. ,, ... , weight percent methylpropyl cellulose ie volume unit

1. One can use salt solutions regardless of _{the Lö Bd} ^ _1n ^ _{Versudl would einef End.}

Type of anion and valence state of the _{concentration of the} above solution of 150 g / l, expressed

Work cations. _{15 worked as} yjo _2J . This solution is provided by a

2. Geometric regularity of the particles. Capillary tube in a 30% aqueous ammonia solution

3. It is possible to drip in with different salt concentrations.

to work trations, both with ver. ^The? Rhaltenen Ammomumuranatkugeln be m dilute solutions of ten grams of connects it ^ S ^offset solution for a time allowed to age and dung per liter (expressed as oxide) and ^a ° ^then paschen. They are then to GEMIT solutions, the suitable methods to saturation concentrated dried, calcined and fired, _s j _nd until the desired density in an appropriate kon

trolled atmosphere is achieved.

The method can be used particularly advantageously on _TT ^ " __,""", _TT "

Use aqueous solutions of salts of metals, 25 Manufacture of spheres from THO ₂ and UO ₂
which can be present in different valencies. Aqueous solutions of thorium and uranyl nitrate,

Thus, for example, salts of the tetravalent or the metal-acid ratio of which are stoichiometric can be hexavalent Uranium and salts of the three-, four-, or those mixed with one another in the desired ratio, use hexavalent plutonium. after which they one after the other while stirring 20 vol-

The above also applies to mixtures of thorium and 30 percent ethylene glycol monoethyl ether per volume of uranium solutions, in which the uranium is present in its highest unit of the solution and 0.8 percent by weight of methylprovalence, as well as to mixtures of thorium pylcellulose per volume unit of the solution Plutonium solutions and from uranium and pluto- become. This experiment was done with a terminal solution. concentration of 130 g / l, expressed as THO ₂ + UO ₂ ,

Of course, the process can vary depending on the intended use and with a UO ₂ content of 16% of the total intended use of the balls produced.

will. This solution is through a capillary tube into a

For example, a 33% aqueous ammonia solution can be dripped around the balls. From to give certain porosity to existing solutions of thorium hydrate and ammonium uranate Compounds from which the balls are made 40 balls are in the same or in a fresh one they should add inert substances that de-dissolve when burning, then washed, dried and removed can be. Also can, for example, glow until the desired density in an expedient manner Substances are added, which is achieved with the controlled atmosphere when dripping.

Claims (5)

1 2 The present invention thus relates to the further claims: Design of the method of German patent 1 212 841 for the production of balls from difficult-to-use 1. Process for the production of balls from agglutinating, refractory materials and is thereby Difficult agglomerating, refractory materials 5 marked that the einnach in the alkaline solution Patent 1 212 841, which means that the solution to be added is 10 grams per liter (calculated draws that the one or more of the refractory Verbinzutropfende in the alkaline solution as oxide) Solution ten grams per liter (contains fertilizer or is concentrated to saturation counts as oxide) one or more of the fire-resistant and at least 5 percent by volume of a compound contains solid compounds or is added to saturation io, which concentrates at least one alcohol function is and with at least 5 volume per shows, is water-soluble and is suitable for the cent of a compound is added, the minimum surface tension and viscosity of the aqueous at least has an alcohol function to act in a water-soluble solution. and which is suitable, on the surface chip- As compounds useful according to the invention, the tion and viscosity of the aqueous solution must have at least one alcohol function, water action, are soluble and are suitable for the surface 2. The method according to claim 1, characterized by drawing in the characteristic voltage and viscosity of the aqueous solutions, that said, to act on the surface, can, for example, both as well as The tension and viscosity of the drop solution are used in polyhydric alcohols. From the monovalent ones The compounds of a partially etherified one-alcohols are, in particular, the ethyl and isosomes polyhydric or heterocyclic Aiko- propylalkohol, of the dihydric alcohols the hol is. Glycols, preferably those of the general formula 3. The method according to claims 1 and 2, da- HOC ₂ - (CH ₂ ), t - CH ₂ OH, wherein η is generally characterized in that the alcohol is ethyl, 0, 1, 2, 3 or 4, useful. Of the trihydric isopropyl alcohol, glycols of the formula 25 alcohols, the glycerols in particular are generally reversible. Also alcohols of the heterocyclic series, HOCH ₂ - (CH ₂ V - CH ₂ OH, especially those of the formula where = 0, 1, 2, 3 or 4, glycerine and heterocyclic alcohols of the formula CH ₂ - CH ₂ - CH ₃ - CH - (CH ₂ ) »0H CH ₂ - CH _{2 - CH 2} - CH - (CH ₂ ) "OH ³ ° O I o 'where η is 1, 2 or 3 provide excellent results Results,
where η = 0, 1, 3 or 3 can be used. When the alcohols have more than one alcohol function 4. The method according to claims 1 to 3, there- 35 have, then they can also partially verätherdurch characterized in that the alcohol of the solution ter form can be used. before the resin is added. They are supplied in quantities of at least 5 volume pro 5. The method according to claims 1 to 4, then, based on the drip solution, used and before characterized in that an aqueous solution is preferably added before the resin of the solution. in the one or more compounds, such as salts of the 40 general, it is not necessary to use more than 50 volumes of four or hexavalent uranium, the three, four or percent of the alcohols. hexavalent plutonium, an alcohol in a For the production of balls according to the invention Amount of at least 5 percent by volume and an appropriate method is of aqueous solutions of the Cellulose resin, preferably methylpropyl cellulose, started out from salts of the metals that make up the spheres added and the same should exist in an alkali solution. Metal salt solutions can be dripped and that the balls obtained are turned, which contain any kind of anion groups, dries and heat treated. z. B. contain hydrochloric acid, nitric acid groups, etc., as long as they are not precipitated from alkali Form complexes. 50 The pH at which the work is carried out is not critical, and changes in it just cause different aging times. He can thus fluctuate within wide limits, yes In the German patent specification 1 212 841, the values achieved are in any case lower than Process for the production of spheres from difficult to 55 be those in which a cation precipitate instead of clumping, refractories that would find kind the uranium, thorium, plutonium, beryllium, aluminum, the solutions on the surface chip nium, magnesium, silicon oxides or carbides for tension and compound acting on viscosity alone or mixed with one another, on chemical and that which gives the balls a cohesion described way. It consists in adding 60 resin and then turning them into alkali Dissolving the compounds from which the balls drip. to be formed, a resin is admixed, its terms being used to precipitate the balls Viscosity increases in the presence of alkali. The forming compounds required alkali solution, The solution obtained in this way is mixed with an alkali solution of the resins which give the spheres cohesion drops, forming regular spheres, which are then valid for all other working conditions dries and glows. Guides in the German patent specification 1212 841. This process can, as has now been found, The choice of alkali depends only on the cathat, be improved. ion type to be knocked down, where