Method of recovery copper, nickel and noble metal in waste water and slag by combined technology of wet method and fire method

Abstract

A process for recovering the copper, Ni and noble metals from the sewage and dregs by the combination of wet method and fire method includes the wet process including extracting, Cu-Ni separation, removing Fe, extracting, and refining nickel carbonate, and the fire process including sintering and smelting to produce nickel matte and black copper. Its advantages are high recovery rate of Ni, Cu, Au, Ag and Pd, and no secondary pollution.

Description

technical field [0001] The invention relates to a method for recovering copper, nickel and precious metals from waste water and slag, in particular to a wet method-fire method combined process for neutralizing slag from waste water and slag in processing industries such as electronics, electroplating, and circuit board surface treatment. Method for recovering copper, nickel and precious metals. Background technique [0002] Wastewater neutralization slag, that is, heavy metal sludge. It is the neutralized solid waste of wastewater from processing industries such as electronics, electroplating, and circuit board surface treatment. It contains a variety of heavy metals and has been listed as hazardous waste by the state. Due to the low level of comprehensive utilization, it not only causes some pollution to the environment, but also a lot of metal resources are wasted. Realizing the resource recycling and environmentally sound treatment of waste water and slag is a major pro...

AI Technical Summary

Problems solved by technology

One is limited to the technical level, only intermittent production

The second is that it is more difficult to process raw materials with low copper and nickel content. Generally, this part of raw materials is not processed. The third is that the energy consumption is large, such as the sintering process consumes a large amount of coal, and the smelting process consumes a large amount of coke.

Fourth, if the flue gas is not properly treated during the sintering and smelting process, it will cause secondary pollution to the environment

Fifth, the metal recovery rate is not high, less than 90%

Sixth, copper, nickel, etc. enter the product at the same time, the price is low, and the economic benefit is not high

Since the waste water and slag come from different manufacturers, the composition is complex, and the content of main metals and impurities fluctuates in a large range, which has a relatively large impact on the process treatment.

(2) The comprehensive utilization rate of metals is not high

Limited to technical factors, the low recovery rate of metals will inevitably lead to high costs and reduced economic benefits. With market changes, the price of wastewater neutralization slag (heavy metal sludge) will increase, which will bring adverse effects

(3) Secondary pollution problem

With the promulgation of the Cleaner Production Promotion Law, the intensity of pollution control will increase. If the problem of secondary pollution is not solved, the prerequisites for the survival of these manufacturers (enterprises) will be lost.