LU82461A1 - METHOD FOR PRODUCING PRELIMINARY PRESSURE PIECES MADE FROM METAL - Google Patents

Description

! y i 4

Process for the production of abrasion-resistant compacts consisting primarily of metal

The present invention relates to a process for the production of predominantly metal, abrasion-resistant, suitable for charging in metallurgical furnaces and vessels.

5

If you want metallic or predominantly metal substances, such as ferroalloys - e.g. If ferrophosphorus, sponge iron and the like, which are present in fine-grained form, are involved in a metallurgical process, one encounters difficulties when charging in blast furnaces, converters or electric furnaces, which can be avoided by effective composting or briquetting.

In metallurgical plants and metalworking plants, there are also 15 metallic or predominantly metal waste materials, the recycling of which is desirable but technically problematic. For example, it is difficult to charge fine and coarse iron filings in a converter, electric furnace or blast furnace without prior effective compacting or briquetting.

The aim of the invention is a method which enables the abovementioned substances to be converted into an abrasion-resistant form which is advantageous with regard to easy charging.

- 25th

This goal is achieved by the method according to the invention, the main feature of which is that the fine-grained or machined metals - they can be both ferrous and non-ferrous metals which are present alone or in a mixture with other substances - with a proportion from 10 to 40% by weight of baking and softening hard coal are mixed and the mixture is briquetted at temperatures from 470 to 530 ° C.

According to the invention, the metals can additionally be mixed with (· - 2 - non-softening, carbonaceous substances such as low-volatile hard coal, coke breeze, fine-grained smoked coke and / or petroleum coke) before the metals are mixed with the baking coal serving as a binder.

5 The surprising new finding is that metallic materials with softening hard coal form a sta. Have the cheap and abrasion-resistant compact combined.

The temperatures that occur during further metallurgical processing of the metal 10 briquettes lead to a considerable loss in strength and deformability of the bound metals, but the binder carbon simultaneously converts into a stable coke structure which counteracts this loss in strength.

15

In the metal-producing processes mentioned here, the carbon originating from the binder is also used as a heat transfer medium and reducing agent.

20 The procedure according to the invention is such that the metals and, if appropriate, the non-softening carbon-containing substances are brought to a temperature above the briquetting temperature before mixing with the proportion of softening baking hard coal and before briquetting, 25 while the softening baking hard coal is at a tempérait structure that is below the softening point of the hard coal. The temperatures of the components are adjusted before mixing so that the desired briquetting temperature results as the mixture temperature.

30th

The method according to the invention also provides for the mixture to be subjected to partial degassing before the briquetting, in which the major part of the tar yield of the binder carbon is released and removed from the briquetting mixture.

A 35 a - 3 - standing mixer, which is equipped with a stirrer, is recommended as a device for the production of the briquetting mixture and its de-targing or partial degassing.

The briquetting is expediently carried out on a roller press which works with contact pressures between 1 and 5 kg / cm of roller width.

* After leaving the roller press, the finished briquettes can be held for a longer period of time, but at least 30 minutes, in the area of the pressing temperature and thereby additionally solidified.

In a further embodiment of the method according to the invention, the compacts are charged hot. In this way, the otherwise necessary cooling is saved and the sensible heat 15 of the compacts is used.

Claims (8)

1. A process for the production mainly of metal, abrasion-resistant, suitable for charging in metallurgical furnaces or vessels, characterized in that fine-grained or machined metals - both iron 5 and non-ferrous metals, alone or in a mixture with other substances - with a proportion of 10 to 4-0% by weight of baking * and softening hard coal are mixed and the mixture is briquetted at temperatures of 470 to 530 ° C. 10th 2, Method according to claim 1, characterized in that the metals are mixed before mixing with baking hard coal, with any proportions of non-softening, carbon-containing substances, such as low-volatile hard coal, coke breeze, smoked coke, petroleum coke. 15 3. Process according to claims 1 and 2, characterized in that the metals and optionally the non-softening carbon-containing substances are brought to a temperature above the Bri chaining temperature before mixing with the amount of softening hard coal and before the bri lies. 4. Process according to claims 1 and 2, characterized in that the proportion of softening hard coal before 25 Mixing with the metal content and before briquetting brings to a temperature which is below the softening point of the hard coal. 5. Process according to claims 1 to 4, characterized in that the temperatures of the components are adjusted before mixing in such a way that the desired briquetting temperature results as the mixture temperature. 6. The method according to claims 1 to 5, characterized in that the mixture is partially degassed before briquetting. - 2 - 7. The method according to claims 1 to 6, characterized in that one holds the obtained compacts after the pressing process for at least 30 minutes in the range of the briquetting temperature. 5 , * 8. The method according to one or more of claims 1 to 7, characterized in that the metal-containing compacts are hot-charged.