Method for treating valuable secondary materials such as electronic waste through oxygen inclined blowing rotary converter

Abstract

The invention discloses a method for treating valuable secondary materials such as electronic waste through an oxygen inclined blowing rotary converter. The method comprises the following steps: (1) material preparation: pretreating valuable secondary materials such as electronic wastes; (2) burdening: burdening the following components in percentage by mass: 62-92% of valuable secondary materials such as electronic wastes, 5-20% of scrap iron or iron shots, 2-10% of quartz stone or silicon powder and 1-8% of limestone; (3) smelting and deslagging: continuously adding materials, smelting under an oxygen-enriched condition, pouring out slag when the quantity of melt in the furnace is close to the position of a furnace mouth, continuously feeding and smelting, and repeating the operation for multiple times until crude copper liquid in the furnace is close to the furnace mouth; (4) blowing: blowing industrial oxygen or oxygen-enriched air into the furnace, blowing for 30-120 minutes, sampling and observing, and finishing blowing after conditions are met; and (5) discharging: pouring out the crude copper liquid through a furnace mouth, casting the crude copper liquid into an ingot shape, and leaving furnace slag in the furnace to enter the next operation furnace period. The method is efficient, energy-saving, environment-friendly, high in recovery rate and high in raw material adaptability.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a method for treating valuable secondary materials such as electronic waste in an oxygen oblique blowing rotary converter. Background technique [0002] Valuable secondary materials such as electronic waste, sludge and slag containing valuable elements such as copper, nickel and rare precious metals, sponge copper, carbon ash copper (copper oxide skin), soot and other valuable secondary materials are complex in composition, containing a variety of metals and organic substances, During the treatment process, there are two major problems: environmental pollution and comprehensive recovery. The main treatment processes include fire method and wet method. Fire methods include blast furnace method, rotary incinerator method, top-blown furnace method and side-blown furnace method. [0003] In the fire process: [0004] 1. Blast furnace smelting technology is a tradi...

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Problems solved by technology

[0004] 1. Blast furnace smelting technology is a traditional process for the treatment of valuable secondary materials such as electronic waste. It used to be the leading process in this industry. It has the advantages of small investment and high efficiency, but its long process, low degree of automation and serious environmental pollution have already facing elimination;

[0005] 2. In fact, the rotary incinerator only pre-treats the raw materials. The organic matter in the valuable secondary materials such as electronic waste is removed by incineration. The output product needs to be smelted, and the energy consumption is high;

[0006] 3. The top blowing furnace method has the advantages of large processing capacity, continuous operation, and high degree of automation, but it has large investment, long process, and high energy consumption. It is generally suitable for relatively stable raw materials. It has complex raw materials and many harmful impurity elements. It is difficult to control valuable secondary materials such as electronic waste, and the processing cost is high, so it is not suitable and suitable for relatively large-scale primary material mining and metallurgy projects;

[0007] 4. The side-blowing furnace method is an enhanced melting pool smelting process developed by China in recent years. It has the advantages of strong raw material adaptability and high production efficiency. It has been widely used and promoted in copper and lead smelting. It is used for electronic waste The treatment of valuable secondary materials such as electronic waste is still in the initial stage of exploration; however, due to the fixed hearth, from the perspective of reaction kinetics, there is not much advantage in the treatment of valuable secondary materials such as electronic waste

[0008] The wet process recovery method is to use nitric acid, sulfuric acid, aqua regia, ammonia, alkali and other media to leach valuable secondary materials such as electronic waste, so that most of the metals (including precious metals and Base metals) dissolve into the liquid phase, and then recover precious metals and other base metals from the liquid phase. The advantages are less waste gas emissions and easy disposal of residues after extraction of precious metals. However, the consumption of chemical reagents is large, the process is complicated, and the level of comprehensive recovery is low. High, the leachate and residue are corrosive and toxic, if not handled properly, it is easy to cause more serious secondary pollution

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