Recycled Copper & Low-carbon Charge Recipe
再生铜与低碳熔炼配料配方
标签：再生铜, 低碳, 炉料配比, 降碳
再生料比例提至 70% 时，采用「1:2:1 分层布料法」：底层电解铜打底（降熔点助流），中层黄铜屑压实打包（密度 2.5 t/m³ 以上防浮料），顶层覆盖草木灰熔剂 2–3 kg/t。熔炼全程覆盖并控制过热度 ≤80 ℃，可将烧损从 6% 压到 2.5% 以下、吨铜碳排放较电解铜原料降低约 65%。铅、铁杂质超标的回收料需搭配 10–15% 纯铜稀释并炉前光谱快检。
With 70% recycled charge, use a 1:2:1 layered method: cathode copper at the bottom (lower melting point, aids flow), compacted brass scrap in the middle (densified above 2.5 t/m³ to prevent floating), 2–3 kg/t of ash flux on top. Keep the melt covered with superheat ≤80 °C to cut burn loss from 6% to under 2.5% and reduce CO₂ per tonne by ~65% versus cathode-only. Scrap with excess Pb or Fe needs 10–15% pure copper dilution plus in-furnace spectrometry. ---