US1012511A - Method of detinning. - Google Patents

Description

H. BRANDENBURG.

METHOD OF DETINNING.

APPLICATION FILED 001.5, 1911.

1,012,51 1 Patentd Dec. 19, 1911.

- Inventor witnesses k n-W 6 18 11112112 OFFIQE.

HEINRICH BRAND IENBURG, 0F KEMPEI V--ON-THE-RHINE, GERMANY.

METHOD or DETINNING.

To all whom it may concern;

Be it known that I, HEINRICH BRANDEN- BU'RG, a subject of the German Emperor, and residing at Kempen-on-the-Rhine, Germany, have invented certain new and useful Improvements in Methods of Detinning, of which the following 'is a specification.

- My invention relates to methods for detinning metals covered wholly or in part by tin, and more particularly to methods for detinning scraps or other waste material carrying more or less tin.

More particularly stated, my invention relates to removal of the tin by aid of a suitable solvent capable of acting u on the tin, and especially when the tin is oxidized. For this purpose the solvent may be either an alkali or an acid.

I have made the discovery that when material to be treated is submerged in a solvent for tin, and is then exposed to the air and afterward again submerged in the solvent and again exposed to air, the success of the detinning operation hinges largely upon the time intervals during which the material is submerged and exposed to atmospheric action. If the material, after being submerged in the solvent, is exposed for too long a time to atmospheric action, the sol-. vent upon its surface dries up, and if the submersion of the material be continued too long other difiiculties are likely to arise. When the material becomes too dry, and is afterward submerged in the solvent, the action of the liquid is rendered unduly slow.

My invention comprehends the alternate treatment of the material, first by submerging it in a solvent and then lifting it out of the solvent, so as to expose it to the action of the air, in orderto promote oxidation, the submersion and the exposure to atmospheric air being properly timed, or in other words being continued for precise periods 'of time.

My invention also comprehends that the material to be operated upon is moved vertically upward and downward, and that two quantities of the material are balanced against each other, so that when one quantity of material is being submerged the other quantity is raised and thereby exposed to atmospheric action.

For the purpose of handling the material appropriate holders may be employed, but this is not in all instances necessary, as the material may be placed in' the form of packets or bales, if desired. It is desirable that Specification of Letters Patent.

Application flied October 5, 1911.

Patented Dec. 19, 1911. Serial No. 653,018.

large holders be used, however, in instances where the material to be detinned is made up of large masses of tinned iron and when the question of cost of handling becomes an important factor. When the masses of material to be treated are raised out of the solvent they are freeto cool rapidly, and the atmospheric air present can readily circulate through the masses.

No special form of apparatus is essential to the practice of my invention, but for the sake of clearness and simplicity I show, by way of example, two forms of apparatus which may be used in carrying out my method.

- Reference is made to the accompanying drawing forming a part of this specification, and in which like letters indicate like parts.

Figure l is a section showin one apparatus. Fig. 2 is a plan view of the same. Fig. 3 is a detail showing an elevation of one of the holders. Fig. 4 is a section somewhat similar to Fig. 1, but showing a slightly different form of the apparatus.

Referring to the structure shown in Figs.

1 and 2 there are two tanks A A for holding the solvent. The material to be detinned is mounted in holders B, which are suspended from a beam C, the latter being fulcrumed at the point E. At D D are two tanks which hold a liquid for washing the mate rials after their treatment in the tank D, and in the atmosphere. By tipping the beam G, the material can first be submerged in the solvent, and then raised into the air and thus exposed to the oxidizing influence of the latter, after which it may be again submerged. The submersion and exposure of the different quantities of the materials to be treated are accurately timed. After the material has been thus thoroughly treated the beam C is turned horizontally and the masses of material are washed by dipping each of the masses one or more times in the washing liquid contained-within the tanks D D, this being done most readily by merely tipping the beam C as before. In treating the masses of material by alternately submerging them in the solvent and lifting them into the air, a minimum of work is required because of the fact that the two masses balance each other upon the beam C. Moreover this arrangement of the various parts enables the time of submersion to coincide with the time of exposure to the atmosphere provided, of course, that care be exterials.

ercised in tipping the beam 0 at the right moment. Each time a mass of material is raised from the solvent and thus exposed to atmospheric action there is more or less oxidizing accomplished by the air, and when this is done, if the material be again lowered and thus immersed in the solvent, the tin is removed with great facility;

In the form shown in Fig. 4 I use a chain F engagin the pulleys G, and upon the ends of the cham I mount holders B for the ma- The tanks A A contain thesolvent. Each holder is provided with an inner chamber E, as will be understood from Fig. 3, in order to facilitate the access of the air to the charge of material.

I claim:

1. The process of detinning tin scraps which consists in maintaining two masses of tin scraps in counterbalanced relation and alternately subjecting one of said masses to the action of a solvent for tin, and to the action of air, and simultaneously subjecting for tin.

2. The method herein described of detinbalancing against each other two masses of the material to be detinned, next simultaneously raisingone mass into the air and lowering the other mass into a solvent for tin, then simultaneously lowering into a solvent. for tin the mass first raised and raising into the air the mass first lowered, so as to expose to the oxidation of the atmosphere the tin carried by said mass first lowered, and repeating the foregoing steps until substantially all of the tin carried by both masses is removed.

In testimony whereof, I aifix my signature in the presence of two witnesses. I

HEINRICH BRANDENBURG. Witnesses:

RUDOLPH FRICKE,

FRIEDRIC O'r'ro WITTMAR.

ning waste tinned iron, which consists in

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