Modifier for scrap brass and method for producing brass alloy using it

Abstract

The invention relates to a modifier for waste brass and a method for producing brass alloys using it, wherein, a modifier for waste brass is characterized in that, in terms of weight percentage, the modifier The composition of Si: 10% to 50%, the master alloy containing Ca: 10% to 30%, the master alloy containing B: 10% to 30%, and the balance is the unavoidable impurities brought by the raw materials. The solubility of Ca and B in the modifier of scrap brass is better in Al, and the melting point of its intermediate alloy is low, which is convenient for dissolving and mixing in copper water, and the amount of added intermediate alloy is small to avoid damage to copper. Secondary pollution of the melt; the method of producing brass alloys by adding modifiers in batches ensures high efficiency and low burning loss rate of modifiers in the refining process, so that it can improve the internal structure of recycled copper and improve its Mechanical properties, thermal processing properties and corrosion resistance; in the process of preparing brass alloys, the amount of modifier used is small, the introduction of impurity components is small, the material uniformity is good, and product defects are few.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and in particular relates to a modifier for waste brass and a method for producing high-performance brass alloys using the brass modifier. Background technique [0002] Scrap copper has always been an important raw material for copper smelting and processing because of its good recycling characteristics. In "urban minerals", recycled copper is one of the non-ferrous metal resources with wide sources and large quantities. [0003] At present, the recycling methods of scrap copper are mainly divided into direct utilization and indirect utilization. Indirect utilization is to remove impurity elements in waste copper by pyrometallurgy technology, and cast it into anode plate, and then obtain cathode copper through electrolysis. However, when the indirect utilization technology is used to process scrap copper with complex components, the smoke and dust generated are complex and difficult to ...

AI Technical Summary

Problems solved by technology

However, when the indirect utilization technology is used to process scrap copper with complex components, the smoke and dust produced are complex and difficult to deal with; at the same time, the smelting time is long, the labor intensity is high, the productivity is low, the process is long, the metal recovery rate is low, and the environmental pollution is serious.

[0004] The direct utilization technology is to directly remelt high-grade scrap copper and cast it into refined copper or copper alloy; among them, direct remelting and refining is a high-efficiency, environmental protection, low energy consumption, and short-process technology for scrap copper recycling, which is gradually Become the main method of scrap copper recycling; as the Chinese invention patent application "a kind of processing method of waste copper scrap", its patent number is CN201711248561.3 (application publication number is CN108165746A) discloses a kind of processing method of scrap copper scrap, The method described therein comprises the following steps: step 1) selecting materials: selecting raw materials containing waste copper, sorting and screening to remove dross, leaving waste copper, yellow and other miscellaneous copper; step 2) crushing materials: sorting and screening The waste purple, yellow and other miscellaneous coppers are broken evenly; step 3) rinse and drain: wash the broken waste copper scraps described in step 2) with tap water, and wait for draining for 3 to 5 hours; step 4) press into blocks : step 3) crushing the scrap copper scraps described in block; step 5) smelting and casting: smelting the scrap copper scraps pressed into blocks in step 4), and then casting into a whole casting in a mold Ingots, to be used; this patent improves the recovery of metals to a certain extent, however, due to the different sources of scrap copper, the chemical composition and physical specifications are different, it is easy to cause a large loss of metal elements during the smelting process, resulting in extremely high performance. Unstable, so the raw and auxiliary material ingredients and feeding technology of the existing copper smelting process are not suitable for scrap copper smelting

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