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Copper-nickel containing industry sludge harmless recycling method

A technology of industrial sludge and resource utilization, applied in the direction of process efficiency improvement, flotation, solid separation, etc., can solve the problems of limited types of metal recovery, high content of heavy metals in raw materials, difficulty in guaranteeing the toxicity of heavy metal leaching, etc., and achieve harmless Recycling, overcoming the effect of high grade requirements of raw materials

Active Publication Date: 2018-11-13
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solidification method is an important method to deal with heavy metal sludge. However, this method has a high capacity expansion rate, heavy metals cannot be recovered, and the long-term solidification effect is unstable.
The wet leaching process has wide adaptability to raw materials, high metal recovery rate, and can realize the leaching of copper and nickel heavy metals in heavy metal industrial sludge, but the process is long, the economic benefit is low, the amount of secondary waste water and residue is large, and the volume reduction effect is not obvious
The reduction effect of the smelting method is obvious, but it requires high heavy metal content in raw materials, and the types of metal recovery are limited, the recovery rate is low, and the cost is high, so it is not suitable for treating low-grade heavy metal sludge
Materialization is a new method of heavy metal sludge treatment. Heavy metal sludge is synergistically made into magnetic materials, fertilizers, cement, etc., but this method is still in the exploratory stage, and the leaching toxicity of heavy metals in the product is difficult to guarantee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Add sodium sulfate, quartz, borax and bituminous coal successively to the copper-nickel industrial sludge with copper and nickel contents of 1.24% and 1.06% respectively in mass fractions of 25%, 30%, 0.5% and 20% and mix well Post-pelleting, after the green pellets are dried, sinter at 1100°C for 60 minutes, grind the sintered ore to -0.074mm and account for 85%, add foaming agent 2# oil 100g / t, collector butyl xanthate 200g / t, Flotation of sinter to obtain copper-nickel mixed concentrate and tailings. The copper-nickel mixed concentrate contains 8.13% and 7.44% copper and nickel respectively, the recovery rates of copper and nickel are 80.64% and 86.33% respectively, and the copper and nickel contained in the tailings are 0.27% and 0.17% respectively.

Embodiment 2

[0018] Embodiment 2: be respectively 3%, 3%, 10%, 10%, 1% and 10% to add pyrite, Mix sodium sulfide, alumina, quartz, borax and bituminous coal and make pellets. After the green pellets are dried, sinter at 1150°C for 30 minutes. Grind the sintered ore until the content of -0.074mm accounts for 65%. Add 2# oil 100g / t. Collector xanthate 200g / t, flotation sinter to obtain copper-nickel mixed concentrate and tailings. The copper-nickel mixed concentrate contains 10.06% and 10.13% copper and nickel respectively, the recovery rates of copper and nickel are 88.85% and 86.4% respectively, and the copper and nickel contained in the tailings are 0.31% and 0.41% respectively.

Embodiment 3

[0019] Embodiment 3: be respectively 10%, 8%, 6%, 2.5% and 5% to add sodium sulfate, pyrite, Mix quartz, water glass and anthracite and make pellets. After the green pellets are dried, sinter at 1050°C for 90 minutes. Grind the sintered ore until the content of -0.074mm accounts for 75%. Add 100g / t of 2# oil and collector Drug 200g / t, flotation of sinter to obtain copper-nickel mixed concentrate and tailings. The copper-nickel mixed concentrate contains 11.12% and 11.76% copper and nickel respectively, the recovery rates of copper and nickel are 87.22% and 87.37% respectively, and the copper and nickel contained in the tailings are 0.46% and 0.50% respectively.

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Abstract

The invention discloses a copper-nickel containing industry sludge harmless recycling method. The content of copper in copper-nickel containing industry sludge and the content of nickel in the copper-nickel containing industry sludge are each 1%-3%. The method comprises the following steps that firstly, after 6%-25% of a vulcanizing agent, 6%-30% of a solvent, 0.5%-2.5% of a fluxing agent and 5%-20% of a reducing agent are added in the copper-nickel containing industry sludge to be evenly mixed, pelletizing is conducted, and green pellets are obtained; secondly, after the green pellets are dried along with a furnace, the green pellets are sintered for 30 min-90 min at the temperature ranging from 1,000 DEG C to 1,150 DEG C, and sinter is obtained; and thirdly, the sinter obtained in the second step is ground till the content of -0.074 mm accounts for 60%-85%, then, 2# oil serves as a foaming agent, butyl xanthate serves as a collecting agent, the usage amounts are 100 g / t and 200 g / t correspondingly, and copper-nickel mixed concentrates and tailings are obtained through flotation. The economical and reasonable method for achieving harmless recycling is provided for overcoming the defects in copper-nickel containing industry sludge treatment in the prior art.

Description

technical field [0001] The invention belongs to the field of environmental protection treatment of hazardous solid waste and resource regeneration, and relates to a method for harmless recycling of heavy metal industrial sludge. Background technique [0002] Copper-nickel-containing industrial sludge is a heavy metal industrial solid waste generated during the environmental protection treatment of various types of wastewater discharged from the metal processing and surface treatment industries. It is clearly defined as a national key hazardous solid waste and must be treated in a harmless manner. At the same time, the content of copper and nickel in the sludge is much higher than the mineable grade of polymetallic sulfide ore resources, which has a high recycling value. Therefore, realizing the harmless recycling of such heavy metal sludge is an inevitable requirement for the sustainable development of resources. [0003] Judging from the reported data, the research on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/24C22B1/16B03D1/00B03D103/02
CPCB03D1/00B03D2203/02C22B1/16C22B1/2406C22B7/00Y02P10/20
Inventor 刘勇陈志强刘牡丹胡红喜周吉奎马致远
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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