Method for biologically leaching heavy metal from heavy metal-contained waste based on pH and potential co-regulation

A bioleaching and heavy metal technology, applied in the direction of improving process efficiency, can solve the problems of high acid consumption, low processing efficiency, and simple processing objects

Active Publication Date: 2015-08-26
厦门资生环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] To sum up, the existing electroplating sludge biological treatment technology has problems such as high acid consumption, simple treatment object, long recovery cycle, low treatment efficiency, and unsatisfactory treatment effect, and it is difficult to realize industrial application

Method used

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  • Method for biologically leaching heavy metal from heavy metal-contained waste based on pH and potential co-regulation
  • Method for biologically leaching heavy metal from heavy metal-contained waste based on pH and potential co-regulation
  • Method for biologically leaching heavy metal from heavy metal-contained waste based on pH and potential co-regulation

Examples

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Embodiment 1

[0055] A method for bioleaching heavy metals from wastes containing heavy metals based on pH and potential co-regulation. The wastes containing heavy metals used in this example is mainly electroplating sludge from an electroplating factory in Hunan. Its appearance is green, and the waste containing zinc and chromium Iron is the main material, followed by copper and nickel, and the moisture content is about 65.41%. The dry basis of the electroplating sludge mainly consists of metal elements and their contents are: Fe 12.16%, Zn 4.4%, Cr 4.39%, Cu 1.01% and Ni 1.16%, etc. (see Table 1 below).

[0056] Table 1: Main metal element content of electroplating sludge dry basis in Example 1

[0057]

[0058] The above-mentioned electroplating sludge is treated by adopting the method for biologically extracting heavy metals in electroplating sludge based on pH and potential co-regulation of the present invention, specifically comprising the following steps:

[0059] (1) Adaptive pr...

Embodiment 2

[0067] A method for biologically extracting heavy metals from wastes containing heavy metals based on pH and potential co-regulation. The wastes containing heavy metals used in this example is mainly electroplating sludge from an electroplating industrial park in Guangdong. Its appearance is green, and the waste containing copper It is mainly composed of heavy metals such as nickel and chromium, and the moisture content is about 73.2%. The main metal elements in the dry base of the electroplating sludge include: Cu 9.02%, Ni 5.72%, Cr 10.22%, Zn 1.12% and Fe 5.35% (see Table 2 below).

[0068] Table 2: Main metal element content of electroplating sludge dry basis in Example 2

[0069]

[0070]

[0071] The above-mentioned electroplating sludge is treated by adopting the method for biologically extracting heavy metals in electroplating sludge based on pH and potential co-regulation of the present invention, specifically comprising the following steps:

[0072] (1) Adapti...

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Abstract

The invention discloses a method for biologically leaching heavy metal from a heavy metal-contained waste based on pH and potential co-regulation. The method comprises the following steps: in a process of leaching out the heavy metal-contained waste by an acidophilic iron oxide microbial agent, the pH value of the leaching system is controlled within 1.0-4.0 in the whole process; meanwhile, an oxidizing agent is combined with a reducing agent to regulate the redox potential of the leaching system, so that the redox potential of the leaching system is controlled within 420-650 mV; the pH value of the leaching system is gradually increased phase by phase in the leaching process; the redox potential of the leaching system is gradually increased phase by phase; the total leaching time is within 8 hours; and finally, the efficient leaching of the heavy metal from the heavy metal-contained waste by the acidophilic iron oxide microbial agent is realized. The method can accelerate biologic leaching of metal from sludge to shorten the leaching time and to reduce the acid consumption, and can greatly improve the biologic leaching efficiency.

Description

technical field [0001] The invention relates to a treatment method for wastes containing heavy metals in the field of environmental protection, in particular to a method based on efficient bioleaching of heavy metals in wastes containing heavy metals. Background technique [0002] Electroplating sludge is the ultimate solid waste in the surface treatment industry. It is easy to accumulate, unstable, difficult to degrade, large in volume (about 23.06 million tons per year according to the statistics of the Ministry of Environmental Protection), and has complex toxic components, especially containing a large amount of chromium, copper, Toxic heavy metals such as nickel and zinc have been listed as national key hazardous wastes. But at the same time, the content of a variety of heavy metals in electroplating sludge is much higher than the grade of mineral development, and its potential value is very high. It is a rare and cheap renewable non-ferrous metal resource. [0003] Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B7/00
CPCY02P10/20
Inventor 周洪波赵邵安
Owner 厦门资生环保科技有限公司
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