Method for preparing copper powder and ferrous sulfate by using solution leached through sludge containing copper wet method

Abstract

A method for preparing copper powder and ferrous sulfate by using a solution leached through a sludge containing copper wet method comprises the following steps that firstly, the solution is leached through the sludge containing copper wet method and filtered; the filtered leaching agent is transferred into a reactor, iron powder is added for a replacement reaction, the concentration of Cu2+ in the leaching agent is reduced to be less than 0.5 g / L after the reaction is complete, solid-liquid separation is conducted, and the copper powder and the replaced solution are obtained; a reducing agent is added to the replaced solution, and the redox potential in the replaced solution is controlled to be reduced to be less than 400 mV; the replaced solution is transferred to an impurity removal reaction tank, heating is conducted, an inorganic solution containing phosphate radical is slowly added, solid-liquid separation is conducted, and phosphate precipitate and impurity-removed liquid are obtained; and the concentration of Fe2+ ions in the impurity-removed liquid is increased to be greater than 300 g / L after evaporation and concentration, transferring to a cooling system is conducted for crystallization, and a ferrous sulfate heptahydrate product is obtained after washing. By the adoption of the method, the cost is low, environmental protection is achieved, the added value of products is high, and resource utilization of waste resources can be achieved.

Description

technical field

[0001] The invention relates to the technical field of comprehensive utilization and treatment and disposal of copper-containing wastewater treatment sludge, in particular to a method for preparing copper powder and ferrous sulfate by using a copper-containing sludge wet solution. Background technique

[0002] Industrial copper-containing wastewater mainly comes from the electroplating, electronics, and circuit board industries. The copper-containing sludge obtained after chemical flocculation, neutralization and sedimentation often contains a large amount of copper, which exists in an unstable form and is toxic to heavy metals. According to the "National Hazardous Waste List", copper-containing sludge is a hazardous waste, but the dry-based copper grade of copper-containing sludge is about 3% to 15%, which is much higher than the mineable grade of copper ore, and it is also a high-value waste. metal resources.

[0003] Wet leaching technology is one of the ...

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