US1728095A - Method of treating copper slag - Google Patents

Description

Patented Sept. 10, 1929.

UNITED STATES PATENT OFFICE.

SUKESAKU YOSHIMOTO, OF AKI-GUN, KOCHI-KEN, JAPAN, ASSIGNOR F ONE-THIRD TO TORATARO OKUMURA, OF KOBE-SI-II, I-IYOGO-KEN, JAPAN, AND ONE-THIRD T0 SEISHICHIRO NAKAMURA, OF I-IYOGO-KEN, JAPAN.

METHOD OF TREATING COPPER SLAG.

No Drawing. Application filed July 6, 1826, Serial No. 120,866, and in Japan June 2, 1926.

This invention relates to a novel method of treating copper slag and more particularly to method of making substitutes for tiles, bricks or the like from copper slag,

and has for its objects to provide a method of converting copper slag in a practical and economical manner into hard and tough articles adapted for use as substitutes for tiles, bricks etc., and also to provide a method for commercially utilizing copper slag which has heretofore been thrown away, as refuse, at relatively high losses.

Another object of this invention is to obtain from copperslag in asimple and positive manner the materials adapted for use in architectural, civil or like works, for example, tiles, bricks, pavement materials and so on, which are hard and tough with a metallic luster and sound and tasteful colour.

Other objects and particularities of this invention are fully disclosed in details in the following description.

It has heretofore been well-known that copper slag ejected in copper refining processes can be coagulated into a block when cooled, but this block is extremely fragile and brittle, and is of no practical use as it is. Therefore, it has been necessary in copper refining works to throw away the blocks of copper slag with a relatively high loss.

According to this invention, copper slag ejected in copper refining processes is taken up in its melted state, and poured into a suitable casting mould. The mould may be of any suitable material for casting and of any desired or predetermined shape and size adopted in accordance with the products to be obtained by this invention.

As soon as the slag becomes coagulated in the mold in the most cases it being of red heat, it is taken out from the mold and sprinkled upon by any suitable means with a mixture of powders of sulphur, mica and iron and bran, such as rice-bran, and then buried in a mass of straw ashes, and cooled down. As the heat conductivity of straw ashes is very low, the cooling of the block is proceeded so slowly as to prevent natural cracking of the block by a too rapid cooling.

The above mentioned mixtures of powders may preferably consist of equal parts of the constitutents as specified, in order to obtain the best effect on the products.

By way of the above mentioned process, I have succeeded in obtaining a very hard and tough mass or article of copper slag, having a metallic luster and sound and a tasteful colour. basis of this invention in obtaining such masses is not clear to the best knowledge of the modern science, it is still a true fact evolved through repeated series of experiments.

Having now particularly described and ascertained the nature and objects of this invention, I declare that what I claim is:

l. The method of treating copper slag to form commercial bodies, comprising moulding the copper slag in a predetermined size and shape, cooling the block thus formed down to a red heat, applying thereto a mixture of powders of sulphur, mica and iron and bran, and annealing, the block thus treated, by slow cooling.

2. The method of treating copper slag to form a hard and tough body, comprising casting said slag in a mold in its molten state, cooling the block of slag thus formed to red heat, moving it from the mould, sprinkling it with a mixture of equal parts of powders of sulphur, mica and iron and rice-bran, and slowly cooling said block by burying the same in a mass of straw ashes.

In testimony whereof I have signed my name to this specification.

SUKESAKU YOSHIMOTO.

Although the theoretical