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Method for comprehensive recovery of valuable metals from electroplating sludge and innocent treatment of electroplating sludge

A harmless treatment and electroplating sludge technology, which is applied in the direction of electric furnace, drum furnace, crucible furnace, etc., can solve the problems of chromium toxicity that cannot be eliminated, changes in phase composition, and influence on metal leaching, etc., and achieve less environmental pollution. Simple operation and high metal recovery rate

Inactive Publication Date: 2014-03-26
CHENZHOU FENGYUE ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although high-temperature roasting can effectively remove impurities in sludge and increase metal content, high temperature will cause changes in phase composition and affect the leaching of metals, but the toxicity of chromium in electroplating sludge cannot be eliminated, and there is a hidden danger of environmental pollution

Method used

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  • Method for comprehensive recovery of valuable metals from electroplating sludge and innocent treatment of electroplating sludge
  • Method for comprehensive recovery of valuable metals from electroplating sludge and innocent treatment of electroplating sludge
  • Method for comprehensive recovery of valuable metals from electroplating sludge and innocent treatment of electroplating sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Ingredients: Mix the 1# comprehensive electroplating sludge according to the following ratio to mix the materials evenly, and at the same time ensure that the coke powder is excessive. The ratio of ingredients:

[0051] 1# comprehensive electroplating sludge: 800kg

[0052] Coke powder: 200kg

[0053] Quartz stone: 120kg

[0054] Limestone: 50kg

[0055] Table 1 Components of 1# comprehensive electroplating sludge (%)

[0056]

[0057] 2. Granulation: Send the prepared materials to the granulator for granulation, the particle size is 20-30mm in diameter;

[0058] 3. Smelting: Add the raw material particles made of electroplating sludge into the oxygen-enriched smelting furnace. After the feeding is completed, the burner gun is inserted into the furnace for smelting. At the beginning of melting, the oxygen-enriched smelting furnace first rotates around the central axis of the furnace at a slow speed, and the speed is 1r / min and then increases continuously, and ...

Embodiment 2

[0066] 1. Ingredients: Mix the 2# comprehensive electroplating sludge according to the following proportions to mix the materials evenly, and at the same time ensure that the coke powder is excessive. The proportion of ingredients:

[0067] 2# comprehensive electroplating sludge: 600kg

[0068] Coke powder: 150kg

[0069] Quartz stone: 100kg

[0070] Limestone: 40kg

[0071] Table 3 Composition of 2# comprehensive electroplating sludge (%)

[0072] ingredients Cu Pb sn Ni Fe Zn Cr Mg Ca S other content 22.54 - 0.25 - 36.99 0.08 3.61 0.19 0.37 2.52 33.45

[0073] 2. Granulation: Send the prepared materials to the granulator for granulation, the particle size is 20-30mm in diameter;

[0074] 3. Smelting: Add the raw material particles made of electroplating sludge into the oxygen-enriched smelting furnace. After the feeding is completed, the burner gun is inserted into the furnace for smelting. At the beginning of melting, t...

Embodiment 3

[0082] 1. Ingredients: 3# comprehensive electroplating sludge, mix the materials evenly according to the following proportions, and at the same time ensure that the coke powder is excessive, the proportion of ingredients:

[0083] 3# comprehensive electroplating sludge: 500kg

[0084] Coke powder: 130kg

[0085] Quartz stone: 80kg

[0086] Limestone: 30kg

[0087] Table 5 Composition of 3# comprehensive electroplating sludge (%)

[0088] ingredients Cu Pb sn Ni Fe Zn Cr Mg Ca S other content 51.24 0.09- 0.02 0.01 14.90 0.07 5.85 0.14 0.22 0.41 27.05

[0089] 2. Granulation: Send the prepared materials to the granulator for granulation, the particle size is 20-30mm in diameter;

[0090] 3. Smelting: Add the raw material particles made of electroplating sludge into the oxygen-enriched smelting furnace. After the feeding is completed, the burner gun is inserted into the furnace for smelting. At the beginning of melting, the o...

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Abstract

The invention discloses a method for comprehensive recovery of valuable metals from electroplating sludge and innocent treatment of electroplating sludge. The method comprises the steps of burdening, pelletizing, smelting, blowing, dust collection, fuming, tail gas treatment and the like. According to the invention, thermometallurgy is adopted, the adaptation of the raw material is broad, the smelting and the blowing are completed in one furnace, equipment is simple to operate, and the metal recovery rate is high; through strong reduction smelting at high temperature, harmful chromium<6+> is reduced to harmless chromium<3+>, so that innocent treatment of electroplating sludge is completed; as the main component of electroplating sludge is metallic oxides, reduced and smelted smoke contains microscale sulfur dioxide only, and desulfuration is not needed for the reduced and smelted smoke; technological waste water is not generated, and pollution to the environment is less; valuable metals can be effectively recovered from electroplating sludge, and innocent treatment of electroplating sludge is realized.

Description

technical field [0001] The invention belongs to pyrometallurgy comprehensive recovery technology, in particular to a method for comprehensive recovery of valuable metals and harmless treatment of electroplating sludge. Background technique [0002] Electroplating sludge is a kind of multi-metal hazardous waste produced in the process of electroplating wastewater treatment, especially electroplating sludge containing chromium, which is more harmful and requires harmless disposal. At present, methods of stabilization, immobilization, and landfilling are widely used, but there is a risk of heavy metal leaching and waste of resources. The content of heavy metals in electroplating sludge is high, and some reach more than 10%. If it is recycled as a resource, it meets the requirements of sustainable development and has obvious economic and environmental benefits. At present, the recycling methods of electroplating sludge mainly include wet method and combined fire method and wet...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B19/00
Inventor 曹亮发
Owner CHENZHOU FENGYUE ENVIRONMENTAL PROTECTION TECH
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