Covering agent for heat preservation of copper and copper alloy inside furnace

Abstract

The invention pertains to copper alloy processing field. A heat preserving furnace of the existing continuous casting copper and copper alloy technique has the shortcomings of no covering agent or the existing covering agent with high cost and poor effect. In the invention, the metals covered on waste graphite electrodes and waste graphite crystallizers are removed, smashed into graphite powder with a granularity ranging from 3 to 750Mum to be taken as a covering agent, so as to form an excellent protective layer with a thickness ranging from 3 to 40mm on the surface of the molten metal surface in the heat preserving furnace. Compared with the existing rice bran covering agent, the covering agent does not cause environmental pollution, the temperature of the external surface of the heat preserving furnace is reduced by 30 to 50 DEG C, and the slag collecting cycle from the time that a new covering layer is formed to the time that slag has to be collected is extended by 500 to 800 percent, the total ash and slag is reduced by 40 to 80 percent, copper particles in the ash and slag is cut down by 60 to 110 percent, the cycle that the slag attached on furnace wall has to be destroyed is lengthened by 700 to 1400 percent, and the slag is easy to clean up, the service life of the continuous caster is prolonged by 30 to 150 percent. The covering agent of the invention is suitable for such non-Ni copper alloys as red copper, brass, Sn-P bronze for vertical continuous casting, up-drawing continuous casting and horizontal continuous casting, and optimized copper alloy of the invention is suitable for non-Ni copper alloy molten by waste copper for horizontal continuous casting.

Description

technical field [0001] The invention relates to a covering agent for copper and copper alloy melt in a holding furnace, which belongs to the field of copper material processing. Background technique [0002] In existing copper and copper alloy continuous casting technology, as patent application CN1861819 " the non-vacuum casting process of Cu-Cr-Zr alloy and Cu-Zr alloy " (disclosure date on November 15th, 2006), it is mentioned in smelting Cu- Add carbon black covering agent in Cr-Zr alloy and Cu-Zr alloy; As the article "Research on Melting Technology of CuCrZr Alloy with High Strength and High Conductivity" (published in "Special Casting and Nonferrous Alloy", 2005, Vol25, No4, p252), in Calcined charcoal and flake graphite are added as covering agents for smelting CuCrZr alloys that are easy to oxidize; however, this article believes that it is not good to add graphite powder in the smelting furnace, because graphite powder is easily wrapped into the melt to form inclus...

AI Technical Summary

Problems solved by technology

[0004] Recently, in the continuous casting technology of brass, we add charcoal as a covering agent in the holding furnace after smelting, but the charcoal comes from felled trees, which is not conducive to environmental protection, and the price is relatively expensive, so the protection effect is not ideal

[0005] Later, we used rice bran as a covering agent, and the statistical results of experiments on the continuous casting technology of rice bran as a covering agent showed that: after the liquid surface of the holding furnace melt was sprinkled with rice bran, the smoke and dust filled the air within half an hour, and the production environment was harsh; The outer surface temperature of the furnace cover on the inner melt covering layer is 150-260°C, and the working environment temperature is high; the slag needs to be removed once every 12 hours, and the total amount of slag ash is 192kg in three days. ~15mm copper particles; the slagging formed on the furnace wall is too strong and tough to be removed, and generally needs to be removed once every 7 days; the life of the continuous casting mold is only 48-96 hours