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Method and equipment for wet extraction of zinc, cadmium and copper from zinc-containing waste residue

A technology of waste slag and wet method, applied in the field of environmental engineering, can solve the problems of complex impurity removal process of leachate, increase of equipment cost, high energy consumption of process, etc., achieve high recovery rate, reduce equipment cost, and simple process

Inactive Publication Date: 2011-10-05
XICHANG HONGXIN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, my country's mineral resources are in short supply and the situation is grim. Copper, zinc, cadmium, etc. contained in industrial waste residues have increasingly become secondary resources with development and utilization value, while traditional recovery methods include traditional wet leaching, cremation and smelting. The impurity removal process of the leachate is complicated, the recovery rate is low, and the process consumes a lot of energy. Zinc powder needs to be added during the recovery process, which has disadvantages such as high cost. Disadvantages such as high equipment cost and energy consumption

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  • Method and equipment for wet extraction of zinc, cadmium and copper from zinc-containing waste residue
  • Method and equipment for wet extraction of zinc, cadmium and copper from zinc-containing waste residue

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Embodiment 1

[0015] A method for wet extraction of zinc, cadmium and copper from zinc-containing waste slag, extracting the zinc-containing, cadmium-containing and copper-containing solution in a reaction kettle at one time, which includes batching, wet extraction, slag discharge and feeding , wherein the batching includes the following steps: adding zinc-containing waste residue and sulfuric acid with a concentration of 90g / l to the reaction kettle through the feed port, adding production wastewater until the liquid-solid ratio is 3:1.5, and adjusting the final pH value to 4.5 ;

[0016] The wet extraction method includes the following steps: heating the reaction kettle through a steam engine and its gas pipeline, stirring with a stirring device, heating and stirring for 160 minutes, controlling the temperature to 75°C, adjusting the pH value at the end point to 2.0, and then according to The grain size in the waste residue is discharged from the liquid outlet of the reactor according to ...

Embodiment 2

[0020] A method for wet extraction of zinc, cadmium and copper from zinc-containing waste slag, extracting the zinc-containing, cadmium-containing and copper-containing solution in a reaction kettle at one time, which includes batching, wet extraction, slag discharge and feeding , wherein the batching includes the following steps: adding zinc-containing waste residue and sulfuric acid with a concentration of 110g / l to the reaction kettle through the feed port, adding production wastewater until the liquid-solid ratio is 5:0.5, and adjusting the final pH value to 5.5 ;

[0021] The wet extraction method includes the following steps: heating the reaction kettle through a steam engine and its gas pipeline, stirring with a stirring device, heating and stirring for 200 minutes, controlling the temperature at 65°C, adjusting the pH value at the end point to 1.5, and then according to The grain size in the waste residue is discharged from the liquid outlet of the reactor according to...

Embodiment 3

[0025] A method for wet extraction of zinc, cadmium and copper from zinc-containing waste slag, extracting the zinc-containing, cadmium-containing and copper-containing solution in a reaction kettle at one time, which includes batching, wet extraction, slag discharge and feeding , wherein, the batching includes the following steps: adding zinc-containing waste residue and sulfuric acid with a concentration of 100g / l to the reaction kettle through the feed port, adding production wastewater until the liquid-solid ratio is 4:1, and adjusting the final pH value to 5 ;

[0026] The wet extraction method includes the following steps: heating the reaction kettle through a steam engine and its gas pipeline, stirring with a stirring device, heating and stirring for 180 minutes, controlling the temperature to 70°C, adjusting the pH value at the end point to 1.8, and then according to The grain size in the waste residue is discharged from the liquid outlet of the reactor according to di...

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Abstract

The invention discloses a method and equipment for wet extraction of zinc, cadmium and copper from zinc-containing waste residue. A zinc-containing solution, a cadmium-containing solution and a copper-containing solution are extracted at one time in a reaction kettle, and the method comprises the following steps of: mixing, performing wet extraction, discharging the residue, and charging. The equipment for wet extraction of zinc, cadmium and copper from the zinc-containing waste residue comprises a reaction kettle (1), a stirring device, at least one liquid outlet (2), a temperature raising device (3) and a beam (4), wherein the liquid outlet (2) is vertically distributed on the side of the reaction kettle; the stirring device comprises a stirring shaft (5) and a stirrer (6), which are connected with each other; and the stirring shaft (5) is arranged on the beam (4). The invention has the advantages that: zinc powder is not used, raw material cost is reduced, a previous ball-milling process is not needed any more, and the equipment cost and energy consumption are reduced; and the invention also has the advantages of simple process, high recovery rate, low cost, low energy consumption and the like.

Description

technical field [0001] The invention relates to the field of environmental engineering, in particular to a method and equipment for wet extraction of zinc, cadmium and copper from zinc-containing waste residue. Background technique [0002] With the increasing frequency of production activities such as non-ferrous metal mining, dressing and smelting, chemical industry, etc., the industrial waste generated has greatly increased both in terms of quantity and type. The discharge and storage of industrial waste not only takes up a lot of land, but also contains Cadmium and other toxic heavy metals pose great pollution and threats to the environment. At present, my country's mineral resources are in short supply and the situation is grim. Copper, zinc, cadmium, etc. contained in industrial waste residues have increasingly become secondary resources with development and utilization value, while traditional recovery methods include traditional wet leaching, cremation and smelting. ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B15/00C22B3/08C22B17/00C22B19/00
CPCY02P10/20
Inventor 高益高雄
Owner XICHANG HONGXIN IND