Refining agent for smelting aluminum alloy and preparation method of refining agent

Abstract

The invention relates to an aluminum smelting purifying agent, in particular to a refining agent for smelting an aluminum alloy and applied to purification treatment in a smelting furnace in the process of aluminum and aluminum alloy smelting, and a preparation method of the refining agent. The refining agent is prepared from the following raw materials in part by weight: 26 to 34 parts of sodium nitrate (NaNO3), 30 to 40 parts of potassium nitrate (KNO3), 15 to 22 parts of sodium aluminofluoride (Na3AlF6), 4 to 6 parts of calcium fluoride (CaF2), 6 to 12 parts of graphite (C), and 2 to 4 parts of sodium carbonate (Na2CO3). The preparation method of the refining agent comprises the following steps of: putting the raw materials of the sodium nitrate, the potassium nitrate, the sodium aluminofluoride, the calcium fluoride, the graphite and the sodium carbonate into a drying type rotary composite stirrer; stirring the raw materials for 60 to 90 minutes at 150 to 250 DEG C; and finally, preparing a powdery refining agent finished product. The refining agent has strong refining capability, has an obvious function in improving the quality of aluminum industry products, is low in cost and less in used amount, significantly saves the cost, improves the working environment of workers, and causes less environmental pollution.

Description

technical field [0001] The invention relates to a purifying agent for aluminum smelting, in particular to a refining agent for aluminum alloy smelting and a preparation method thereof which is used for purifying treatment in a melt furnace during the smelting process of aluminum and aluminum alloy. Background technique [0002] In the modern aluminum alloy smelting process, in order to remove the influence of metal inclusions and harmful elements on the quality of the material, on the one hand, strict requirements are put forward on the raw materials for the preparation of alloys; New materials such as fluxes and additives. At present, domestic aluminum alloy smelting mainly adopts the adsorption refining method of adding various fluxes, including the refining method of introducing nitrogen and using chlorine salt as a refining agent. Commonly used chlorides are sodium chloride (NaCl), zinc chloride (ZnCl 2 ), manganese chloride (MnCl 2 ), hexachloroethane (C 2 Cl 6 ), ...

AI Technical Summary

Problems solved by technology

The refining gas produced by a single mass of chlorine salt is only ALCL 3 , the gas production is relatively small, so the refining effect is also poor

While hexachloroethane and carbon tetrachloride react at the melting temperature to form Cl 2 , HCl, AlCl 3 、C 2 Cl 4 and other gases, although the refining effect is better, but hexachloroethane (C 2 Cl 6 ), carbon tetrachloride (CCl 4 ) is small in density and fast in response, it is difficult to control the amount and time in the production process

Using the above chlorides as refining agents, the smelted products have quality defects such as zinc increase and manganese increase to varying degrees; the decomposition products are not only toxic but also have a strong pungent smell, which is not only harmful to the health of workers, but also easily damages equipment and polluted environment