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

A combined process and precious metal technology, applied in the field of recycling copper, nickel and precious metals, can solve the problems of high cost, declining economic benefits, rising prices, etc., and achieve the effect of strong adaptability of raw materials and high comprehensive utilization rate of metals

Inactive Publication Date: 2006-01-11
孙涛 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 manufa...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Raw material (neutralized slag containing nickel-copper wastewater) composition:

[0045] Ni8.20%, Cu6.33%, Fe3.50%, CaO3.0%, Cr2.25%, MgO0.2%,

[0046] al 2 o 3 0.10%Zn0.11%Au3.5g / tAg60.5g / tPd2.5g / t.

[0047] According to the process steps, it is described as follows:

[0048] (1) Leaching

[0049] The neutralized slag in the above waste water is stirred and leached.

[0050] Leaching technical conditions: Leaching agent: 98% sulfuric acid; add intermittently.

[0051] Leaching method: stirring leaching; stirring speed 80 rpm;

[0052] The volume of compressed air blown in is 55 liters / minute;

[0053] Endpoint pH: 1.3;

[0054] Leaching time: 2.5 hours.

[0055] Copper and nickel are separated after leaching.

[0056] (2) Separation of copper and nickel:

[0057] Copper and nickel separation technical conditions: A sulfide copper removal

[0058] Sodium sulfide concentration 15%;

[0...

Embodiment 2

[0104] Raw material (neutralized slag containing nickel-copper wastewater) composition:

[0105] Ni6.20%, Cu7.33%, Fe5.50%, CaO4.0%, Cr1.25%, MgO0.18%, Al 2 o 3 0.11%Zn0.13%Au3.29g / tAg70.6g / tPd3.05g / t.

[0106] According to the process steps, it is described as follows:

[0107](1) Leaching: stirring and leaching the above-mentioned waste water neutralized slag. Adjust the technical conditions according to the raw material situation. In order to ensure a higher leaching rate of nickel and copper and a lower leaching rate of iron, chromium and aluminum, the reaction time should be increased and the pH value of the solution should be increased. That is, keep the pH value at 1.5 during the leaching process, and continue to stir after the leaching is completed, and the time is increased by 1.0 hours.

[0108] Leaching technical conditions: terminal pH: 1.5;

[0109] Leaching time: 3.5 hours.

[0110] Other conditions are with embodiment 1.

[01...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/00C22B1/16C22B11/00C22B15/00C22B23/00
CPCY02P10/20
Inventor 孙涛岳喜龙
Owner 孙涛
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