JPS60221535A - Regenerated raw material for melting using aluminum swarf - Google Patents

Abstract

PURPOSE:To provide the titled regenerated raw material for melting which is easy to handle and yields a molten metal having high quality at a good yield by mixing much aluminum swarf and magnesia cement and solidifying the mixture. CONSTITUTION:The mixture composed of about 15-1% outer percentage magnesium oxide powder and about 15-1% magnesium chloride as well as about 1-10% water are added and mixed to and with aluminum swarf and the mixture is put into dies and is molded under pressure. The molding is put into a thermostatic furnace kept at about 50-200 deg.C and is dried for about 20-90min, by which the molding is dehydrated. Many small pieces of the aluminum swarf are thus solidified with the magnesia cement formed by the interreaction of the magnesium oxide and magnesium chloride as a binder, by which the regenerated raw material for melting is obtd. The raw material, when heated, generates gaseous chlorine from the magnesia cement and prevents oxidation of the aluminum swarf.

Description

Detailed Description of the Invention The present invention aims to solve the following problems. (Industrial Field of Application) The present invention relates to melting raw materials for aluminum and aluminum alloys, and more specifically, to processing aluminum or aluminum alloys. This invention relates to regenerated melting raw materials using cutting waste generated during production.

(Prior Art) A large number of cutting chips are carried as they are and added to the molten aluminum alloy that is being melted as swarf material. Since the narciminium cutting waste is in the form of discordant pieces, it is difficult to handle it. Also, a large amount of air contained between them mixes into the molten metal during addition. As a result, when these small pieces of cutting waste are heated and melted, oxidation is significant, and so-called Delonne occurs to a large extent. Therefore, the progress of recycling aluminum cutting waste and -17
is a low value. In order to solve this problem, attempts have been made to solidify the aluminum cutting waste by pressing, but the aluminum cutting waste is still solid.

(Problems to be Solved by the Invention) The present invention aims to solve the above-mentioned problems of the prior art. The aim is to provide recycled dissolved raw materials.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures described in the claims, and its effects are as follows.

(Function) The function of the present invention is that a large number of small pieces of aluminum cutting waste can be handled as a lump. The magnesia cement that fills the spaces between the many cutting chips prevents air from coming into contact with them and prevents them from oxidizing. The reduction in the amount of air brought into the melting furnace by the magnesia cement, together with the action of chlorine gas generated from the magnesia cement during heating, prevents oxidation of the heated cuttings.

(Example) Examples of the present application will be described below. The recycled melted raw material consists of aluminum cutting waste (hereinafter referred to as cutting waste), magnesium oxide, and chloride.

Since the chips are cut by tools, they are small pieces of various shapes, and due to the nature of the metal Nisso, they exhibit elasticity.This condition is particularly noticeable in the material called "dry powder."

Next, the manufacturing procedure of the recycled melted raw material will be explained. For cutting waste, 15-1% magnesium oxide powder and 15-1%
% of magnesium chloride and 1 to 10% of water are added and mixed into a mold and pressure-molded. For example, a 100t friction 7° lever is used for pressurization. The mold to be used is, for example, a split mold, and has dimensions of, for example, an inner diameter of 10 ann and a length of 80 ann.

The above mixture is placed in a mold and pressurized, and once molded, it is immediately placed in a constant temperature oven at 50 to 200°C (for example, 150″C) and dried for 20 to 90 minutes (for example, 30 minutes) to dehydrate. Drying and dehydration may be performed by natural drying.

By the above procedure, many small pieces of cutting waste are removed.
It is solidified using so-called magnesia cement, which is produced by the reaction of magnesium oxide and magnesium chloride, as a binder, and a recycled dissolved raw material is completed.

In the raw material produced as described above, the spaces between the many cutting chips are filled with magnesia cement, and the amount of air mixed in the raw material is small.

Therefore, when this raw material is stored, a large amount of cutting waste is unlikely to be oxidized by the air.

Next, when the raw material is put into a regeneration melting furnace and melted, the cutting waste is heated and becomes easily oxidized. However, many of the spaces between the cutting chips are filled with the magnesia cement, so that the cutting chips are less likely to come into direct contact with the air. Further, when the raw material is heated, chlorine gas is generated from the magnesia cement, and the gas surrounds the cutting waste. As a result, oxidation of the aluminum cutting waste is extremely low.

Next, the aluminum cutting waste in the raw material is heated as described above and melted into a molten metal.

On the other hand, magnesia cement decomposes to produce powdered magnesia, which floats on top of the molten metal and prevents air from coming into contact with the molten metal surface. As a result, oxidation of the molten metal is prevented.

Next, to give an experimental example, when we compared the case where cutting chips were remelted at 700'C and the case where solidified raw materials were remelted as described above, the yield rate was 83% in the former case.
However, in the latter case, the yield rate was 97%.

Next, magnesium chloride in the magnesia cement may be replaced with calcium chloride or sodium chloride. Specifically, when 7% magnesium oxide powder and the same amount of calcium chloride or sodium chloride were added to the cutting waste, a small amount of water was added, and the mixture was press-molded and dried, the result was almost the same as the above-mentioned magnesia cement. Similar solidified moldings can be obtained.

(Effect of the invention) As described above, in the present invention, the first
In handling such as transportation and charging into a melting furnace, a large number of cutting chips are bound together with magnesia cement, so they can be easily handled as a lump.

Second, while the raw material of the present invention is stored, the magnesia cement that fills in between the many small pieces of cutting waste prevents air from coming into contact with the cutting waste, preventing oxidation of the cutting waste and improving its quality. Can be maintained well.

Thirdly, in the process of heating the raw material of the present application for melting, the magnesia cement filling the spaces between the cutting waste reduces the amount of air existing around the cutting waste, and the opportunity for that air to come into contact with the cutting waste. At the same time, the chlorine gas generated from the heated magnesia cement becomes a gas surrounding the cutting chips, preventing oxidation of the cutting chips, improving the quality of the resulting molten aluminum, and increasing the yield. Fourth point. When the raw material of the present application is melted, the magnesia produced by the change of magnesia cement floats on the surface of the molten aluminum, preventing air from coming into contact with the molten metal, thereby improving the above-mentioned quality and yield.

Claims (1)

[Claims] A recycled melting raw material using aluminum cutting waste, which is made by mixing a large amount of aluminum cutting waste with magnesia cement and solidifying it.