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Method for separating copper from iron in sludge by virtue of hydrodynamic cavitation-assisted extraction

A technology of hydraulic cavitation and sludge, applied in the direction of improving process efficiency, can solve the problems of difficult to completely dissolve, difficult to achieve, and difficult to separate from the liquid phase, and achieves good separation effect, less acid consumption, and energy conversion. Efficient effect

Inactive Publication Date: 2014-12-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this is difficult to achieve in the actual leaching process. On the one hand, because the actual leaching process is difficult to reach thermodynamic equilibrium (ie, the end point of the reaction) in a limited time, the copper ion with a large solubility product is due to being absorbed by other components. Partially wrapped in the solid phase, it is difficult to dissolve completely without the addition of excess acid. At the same time, during the addition of acid, because the added acid cannot be mixed evenly with the entire reaction system in an instant, it often forms around the acid addition point. In the temporary high concentration area, this temporary local overconcentration partially dissolves the ferric iron with a small solubility product, and after the uniform mixing and local overconcentration disappears, these dissolved iron ions condense into tiny crystal grains to form a sol It is not easy to separate from the liquid phase, so that the separation process of different metals is difficult to occur in the actual leaching process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The wastewater treatment sludge of a circuit board factory contains 3.5% copper, 4.2% iron and 76.3% water. The copper and iron separation process is as follows:

[0016] 1. First put the sludge into the pulping kettle and add water to make the total water content reach 90%, fully stir for half an hour, then pump it to a 600-mesh vibrating sieve with a thick slurry pump for screening, and the sieved coarse material will return to The pulping tank is repulped. The screened slurry was then stirred with 20ml / L hydrogen peroxide for half an hour. .

[0017] 2. Divide the screened fine material into two parts. The first part is pre-leached by adding 20% ​​sulfuric acid under the condition of full stirring. The leaching time is one hour. Under the condition of full stirring, the second part is gradually added to the first part of high-acidity slurry, and the amount added is controlled so that the pH value after the entire leaching process is completed is 2.9.

[0018] 3. R...

Embodiment 2

[0022] The wastewater treatment sludge of an electroplating plant contains 2.3% copper, 3.2% iron, and 82.3% water. The copper-iron separation process is as follows:

[0023] 1.1. First put the sludge into the pulping tank and add water to make the total water content reach 90%, stir it fully for half an hour, then pump it to a 600-mesh vibrating screen with a thick slurry pump for screening, and the sieved coarse material is returned to The pulping tank is repulped. The screened slurry was then stirred with 15ml / L hydrogen peroxide for half an hour.

[0024] 2. Divide the screened fine material into two parts, the first part is under the condition of full stirring, add 31% hydrochloric acid to carry out pre-leaching, the leaching time is one hour, the pH value of controlling the leaching end point is 1.5, and then in Under the condition of sufficient stirring, the second part is gradually added to the first part of high-acidity slurry, and the amount added is controlled so t...

Embodiment 3

[0029] The pickling water treatment sludge of a metal products factory contains 5.2% copper, 4.5% iron, and 70.3% water. The copper and iron separation process is as follows:

[0030] 1. First put the sludge into the pulping kettle and add water to make the total water content reach 90%, fully stir for half an hour, then pump it to a 600-mesh vibrating sieve with a thick slurry pump for screening, and the sieved coarse material will return to The pulping tank is repulped. The screened slurry was then stirred with 30ml / L hydrogen peroxide for half an hour.

[0031] 2. Divide the screened fine material into two parts, the first part is under the condition of full stirring, add 31% hydrochloric acid to carry out pre-leaching, the leaching time is one hour, the pH value of controlling the leaching end point is 1.5, and then in Under the condition of full stirring, the second part is gradually added to the first part of the high-acidity slurry, and the amount added is controlled s...

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PUM

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Abstract

The invention provides a method for separating copper from iron in sludge and belongs to the technical field of environment friendliness. The method can be used for recycling the heavy metal sludge. The method comprises the following steps of firstly slurrying the sludge and oxidizing, and then adding an acid into the sludge, pre-extracting, and then carrying out cavitation treatment on the pre-extracted mixture by virtue of a hydrodynamic cavitation reactor, reinforcing the extraction process by virtue of the effect generated by the hydrodynamic cavitation to extract a majority of copper to enter a liquid phase and retain iron in a solid phase and then completing the separation process of iron in the solid phase from copper in the liquid phase by virtue of solid-liquid separation. The method disclosed by the invention has the characteristics of high energy conversion efficiency, good separation effect, less usage of acid and the like and is very suitable for the resource recycling of copper and iron in the heavy metal sludge.

Description

【Technical field】 [0001] The invention relates to a method for separating copper and iron in sludge, which can be used for recycling heavy metal sludge and belongs to the technical field of environmental protection. 【Background technique】 [0002] Heavy metal sludge is a kind of sludge produced by wastewater treatment in some industrial enterprises. It is a kind of highly polluting industrial waste. Its composition is a mixture of various heavy metal hydroxide precipitation or carbonate precipitation. If it is not resourced Chemical treatment will inevitably cause environmental pollution and waste of resources. At present, most domestic manufacturers engaged in the treatment of heavy metal sludge adopt two processes: fire method and wet method. The former method causes relatively large secondary pollution, and the recycling of resources is not complete. The latter method is to completely dissolve the sludge with acid first, and then separate it by ammonia leaching or step-...

Claims

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Application Information

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IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 谢逢春伍琳瑛
Owner SOUTH CHINA UNIV OF TECH