Copper recycling process of copper casting scum by utilizing biological dump leaching

A technology for biostack and copper recovery, applied in the chemical industry, can solve the problems of large extraction impact, uneconomical copper extraction process, and oxidative deterioration of extractant, and achieves the effects of simple equipment, easy implementation and low cost

Inactive Publication Date: 2014-09-03
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional recovery process needs to add oxidizing agents such as nitric acid to promote the dissolution of copper. The oxidizing agent has a great influence on the subsequent extraction, resulting in oxidative deterioration of the extraction agent, making the copper extraction process uneconomical.

Method used

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  • Copper recycling process of copper casting scum by utilizing biological dump leaching
  • Copper recycling process of copper casting scum by utilizing biological dump leaching
  • Copper recycling process of copper casting scum by utilizing biological dump leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Naturally cooled copper casting dross from a copper strip processing enterprise, copper mainly exists in the form of simple copper, and its chemical composition is shown in Table 1.

[0025] Table 1 Analysis results of main elements* / %

[0026]

[0027] Take the copper casting scum described in Table 1, crush it to -20mm (below 20mm) through the crushing system, add pyrite with a particle size of -10mm (below 10mm) after crushing, pyrite and copper casting scum The weight ratio is 1:1, and it is granulated by a cylinder granulator, and transported to the storage yard by a dump truck or a belt for piling. Utilize concentration to be 10% sulfuric acid to rinse ore heap, make ore heap pH value be adjusted to 1.5. Microorganisms are inserted into the ore heap, and iron is oxidized to ferric iron by the action of microorganisms, and copper is oxidized and leached by ferric iron and bioleaching process to produce acid. During the heap leaching process, the heap height is...

Embodiment 2

[0029] Naturally cooled copper casting dross from a copper foil processing enterprise, copper mainly exists in the form of simple copper, and its chemical composition is shown in Table 2.

[0030] Table 2 Analysis results of main elements* / %

[0031]

[0032] Take the copper melting and casting scum described in Table 2, and crush it to -20mm through a crushing system, add pyrite with a particle size of -10mm after crushing, the weight ratio of pyrite and copper melting and casting scum is 6:1, and pass through a circle The pellets are granulated by the drum granulator and transported by dump truck or belt to the storage yard for stacking. The ore heap is rinsed with sulfuric acid with a concentration of 5%, so that the pH value of the ore heap is adjusted to 2.5. Microorganisms are inserted into the ore heap, and iron is oxidized to ferric iron by the action of microorganisms, and copper is oxidized and leached by ferric iron and bioleaching process to produce acid. Duri...

Embodiment 3

[0034] Naturally cooled copper casting dross from a copper strip processing enterprise, copper mainly exists in the form of elemental copper, and its chemical composition is shown in Table 3.

[0035] Table 3 Analysis results of main elements* / %

[0036]

[0037] Get the copper melting and casting scum described in Table 3, it is broken to-20mm by crushing system, add the mixed ore of pyrite and copper sulfide (CuS) that particle size is -10mm after breaking, the content of pyrite in the mixed ore is 30%, CuS content is 6%. The weight ratio of mixed ore to copper casting scum is 5:1, which is granulated by a cylinder granulator and transported to the storage yard by a belt for piling. Utilize concentration to be 8% sulfuric acid leaching ore heap, make ore heap pH value be adjusted to 2.5. Microorganisms are inserted into the ore heap, and iron is oxidized to ferric iron by the action of microorganisms, and copper is oxidized and leached by ferric iron and bioleaching pro...

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Abstract

The invention provides a copper recycling process of copper casting scum by utilizing biological dump leaching. The process comprises the steps of: crushing copper casting scrum to be below 20mm by virtue of a crushing system; adding pyrite with the granularity of below 10mm or mixed ore of the pyrite and copper sulphide ore after the crushing to ensure that the weight ratio of sulphide ore to the copper casting scum is 1: 1 to 5:1; pelleting by virtue of a drum polletizing machine; delivering to a stock dump by virtue of a self-discharging automobile or a belt for dumping; eluting the stock heap by utilizing sulfuric acid with the concentration of 5-10 percent and thus regulating a pH value of the stock heap is 1.5-2.5; inoculating microorganisms into the stock heap for oxidizing iron into ferric iron by utilizing the function of the microorganisms; producing acid by utilizing a ferric iron and organism leaching process for oxidizing and leaching copper, wherein the height in the dump leaching process is 1-6m, the dump leaching period is 1-6 months, and the spraying intensity is 5-30 L/(h.m<2>). The copper resource comprehensive recycling process is simple, low in investment and cost, simple in equipment and easy to carry out, so that the copper recycling process of copper casting scum by utilizing biological dump leaching takes the obvious advantage.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a copper scum biological heap leaching process for recovering copper. Background technique [0002] my country is the largest copper consumer and the second largest producer in the world. In 2011, the copper output reached 5.18 million tons, and the consumption exceeded 7.86 million tons. The copper industry plays a pivotal role in my country's social and economic development. With the continuous development of my country's copper industry, copper ore resources have been increasingly exhausted. At present, copper ore containing 0.2% to 0.3% copper has been mined and utilized. Various copper slags produced in the process of smelting and casting of copper and its alloys are Important secondary resources are increasingly valued. Copper and its alloys are often covered with charcoal and rice bran to prevent oxidation and hydrogen entry during melting and casting. The practice of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/18
CPCY02P10/20
Inventor 朱茂兰涂弢朱根松张丽娜王瑞祥
Owner JIANGXI UNIV OF SCI & TECH
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