Copper slag treatment method by utilizing rotary hearth furnace direct reduction and ore-smelting electric furnace smelting reduction

Abstract

The invention discloses a copper slag treatment method by utilizing rotary hearth furnace direct reduction and ore-smelting electric furnace smelting reduction. The method comprises the following steps that 1) raw materials are treated, specifically, copper slag, silica powder, a reducing agent and a binder are prepared and mixed, then are prepared into copper slag carbon-containing pellets through a pelletizing process, and the copper slag carbon-containing pellets are dried for later use; 2) rotary hearth furnace reduction and pellet coking enhancing are conducted, specifically, the copper slag carbon-containing pellets are fed into the rotary hearth furnace for reduction to obtain zinc oxide powder and metalized pellets; and 3) ferrosilicon smelting is conducted, specifically, the high-temperature metalized pellets discharged from the rotary hearth furnace are directly fed into the ore-smelting electric furnace for smelting to obtain a ferrosilicon iron alloy and the slag. Accordingto the method, an innovative process of the rotary hearth furnace reduction and ore-smelting electric furnace smelting combination is adopted, a zinc element is recycled in the rotary hearth furnaceto obtain high-value-added zinc oxide powder, the high-temperature metalized pellets discharged from the rotary hearth furnace are directly hot-loaded into the ore-smelting electric furnace for smelting, the process that traditional cold burden inlet into the furnace needs to consume electric energy for heating is omitted, and the power consumption and the raw material cost are greatly saved.

Description

technical field [0001] The invention relates to a copper smelting tailing slag treatment process, in particular to a method for treating copper slag by direct reduction in a rotary hearth furnace and smelting reduction in a submerged heat electric furnace. Background technique [0002] Copper slag is the slag produced in the copper smelting process, which is a kind of non-ferrous metal slag. The waste slag discharged from reverberatory furnace copper smelting is reverberatory furnace copper slag, and the waste slag discharged from blast furnace copper smelting is blast furnace copper slag. China is a major copper producer in the world, and 90% of them use pyrometallurgy. Every ton of copper produced will produce about 2.2 tons of smelting slag. 120 million tons. The chemical composition of copper slag is SiO 2 : 30%~40%, CaO: 5%~10%, MgO: 1%~5%, Al 2 o 3 Fe: 2% to 4%, Fe: 27% to 40%, Zn: 1% to 3%; the main phase is fayalite, followed by magnetite, glass and sulfide. At...

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Problems solved by technology

[0009] In the prior art, copper slag is mostly used as an additive to some cement, and the silicon, iron, and zinc elements in it are not rationally utilized; there are also copper slag, silica and low- and medium-rank coals that are mixed and processed directly in the submerged heat electric furnace The technology for smelting ferrosilicon in China does not recover 2% to 3% of zinc in copper slag. At the same time, the smelting temperature is 1700°C to 2000°C, and the time is 0.5 to 2 hours. high

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