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Method for crystal separation of zinc and cadmium from zinciferous waste residues

A technology of crystallization separation and waste residue, applied in the field of environmental engineering, can solve the problems of complex impurity removal process of leachate, high energy consumption of process, low recovery rate, etc., and achieve the effect of low cost, simple process and saving zinc powder

Active Publication Date: 2015-05-13
XICHANG HONGXIN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional recovery method has disadvantages such as complex impurity removal process for leachate, low recovery rate, large process energy consumption, and zinc powder added in the recovery process, which has the disadvantages of high cost.

Method used

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  • Method for crystal separation of zinc and cadmium from zinciferous waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A method for crystallizing and separating zinc and cadmium from zinc-containing waste slag, comprising the following steps:

[0018] S1. Raw material pulping: the zinc-containing waste slag is pulverized and put into the slurry mixing tank, and the collected production wastewater is added to fully stir to make a slurry liquid;

[0019] S2. Neutral leaching: pump the slurry liquid obtained in step S1 into the leaching reactor, and then inject sulfuric acid with a concentration of 150g / ml, the volume ratio of sulfuric acid to the slurry liquid is 3:1; at the same time, heat the leaching reactor to 65°C , and stirred until the pH at the end of the reaction was 4.5 to obtain leached pulp;

[0020] S3. Filtration: Filter the leached pulp obtained in step S2 through a filter to obtain filter residue and leaching filtrate; the leaching filtrate enters the next process, and the filter residue is filtered again after acid leaching and iron removal, and the obtained ...

Embodiment 2

[0025] Example 2: A method for crystallizing and separating zinc and cadmium from zinc-containing waste slag, comprising the following steps:

[0026] S1. Raw material pulping: the zinc-containing waste slag is pulverized and put into the slurry mixing tank, and the collected production wastewater is added to fully stir to make a slurry liquid;

[0027] S2. Neutral leaching: pump the slurry liquid obtained in step S1 into the leaching reactor, and then inject sulfuric acid with a concentration of 200g / ml, the volume ratio of sulfuric acid and slurry liquid is 6:1; heat the leaching reactor at the same time to 75°C , and stirred until the pH at the end of the reaction was 5.5 to obtain leached pulp;

[0028] S3. Filtration: Filter the leached pulp obtained in step S2 through a filter to obtain filter residue and leaching filtrate; the leaching filtrate enters the next process, and the filter residue is filtered again after acid leaching and iron removal, and the obtained filt...

Embodiment 3

[0033] Example 3: A method for crystallizing and separating zinc and cadmium from zinc-containing waste slag, comprising the following steps:

[0034] S1. Raw material pulping: the zinc-containing waste slag is pulverized and put into the slurry mixing tank, and the collected production wastewater is added to fully stir to make a slurry liquid;

[0035]S2. Neutral leaching: pump the slurry liquid obtained in step S1 into the leaching reactor, then inject sulfuric acid with a concentration of 160g / ml, the volume ratio of sulfuric acid to the slurry liquid is 3-6:1; heat the leaching reactor at the same time 65~75°C, stirring until the pH of the reaction end point is 4.8, and the leaching pulp is obtained;

[0036] S3. Filtration: Filter the leached pulp obtained in step S2 through a filter to obtain filter residue and leaching filtrate; the leaching filtrate enters the next process, and the filter residue is filtered again after acid leaching and iron removal, and the obtaine...

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Abstract

The invention discloses a method for crystallizing and separating zinc and cadmium from zinc-containing waste residue, which comprises the following steps: S1. Raw material slurrying; S2. Neutral leaching; S3. Filtration; S4. Depositing germanium; S5. Depositing indium; S6. Copper sinking; S7. Concentrated crystallization; S8. Electrode enrichment. The invention adopts the concentrated crystallization method to directly separate zinc and cadmium from the mixed solution of zinc sulfate and cadmium sulfate, saves zinc powder, reduces production cost and simplifies production process. By applying the invention, valuable metals such as zinc, iron, copper and cadmium in the zinc-containing waste residue can be recovered and utilized at low cost and low energy consumption, and the purpose of high-value comprehensive utilization of the zinc-containing waste residue can be realized. The invention has the advantages of simple process, convenient operation, 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 for crystallizing and separating zinc and cadmium from zinc-containing waste residue. Background technique [0002] With the increasing frequency of production activities such as non-ferrous metal mining, dressing and smelting, and chemical industry, the industrial waste generated has greatly increased both in quantity and in type. The discharge and storage of industrial waste not only takes up a lot of land, but also The non-ferrous metals such as cadmium contained in it constitute a great pollution and threat to the environment. The existing non-ferrous metal hazardous waste treatment technologies include solidification landfill, throwing into the sea, incineration and other technologies. These technologies have disadvantages such as occupying cultivated land, wasting resources, high cost, and potential long-term secondary environmental pollution. [0003] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B19/30C25C1/16C22B15/00C22B41/00C22B58/00
CPCY02P10/20
Inventor 高益
Owner XICHANG HONGXIN IND