Method for enriching germanium from wet process zinc smelting system

A hydrometallurgical zinc smelting and enrichment technology, applied in the direction of improving process efficiency, can solve the problems of difficult solid-liquid separation of ferric hydroxide colloid, low grade of neutralized slag and germanium, affecting zinc electrolysis efficiency, etc., and achieves high replacement rate. , Process condition control, low cost effect

Active Publication Date: 2011-04-27
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The tannins left in the solution by the traditional tannin method will seriously affect the electrolysis efficiency of zinc; the extraction method also has some problems, such as: the system requires high acidity, the consumption of extraction agents is large, and the shortage of main domestic extraction agents also restricts its expansion. Application: The neutralized germanium slag obtained by the enrichment method is low in grade and difficult to filter, and still needs to be treated with tannin, and the production cost is also high. The ferric hydroxide colloid produced by the treatment method takes away a large amount of zinc sulfate, and the solid-liquid separation of the ferric hydroxide colloid is difficult

Method used

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  • Method for enriching germanium from wet process zinc smelting system
  • Method for enriching germanium from wet process zinc smelting system
  • Method for enriching germanium from wet process zinc smelting system

Examples

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Effect test

Embodiment 1

[0021] see figure 1 , add neutralizer zinc oxide calcine to the high-acid germanium extraction liquid (containing germanium 24mg / L) to adjust the pH to 4.5, control the heating temperature at 100°C, then add iron powder to reduce ferric ions, and control the temperature at 90°C After 20 minutes of reaction, a second batch of excess iron powder was added, the temperature was controlled at 95° C., the reaction time was 120 minutes, and the replacement rate of germanium could reach 96.2%. After liquid-solid separation, the replaced liquid needs to sink alum again to remove iron, and the replacement slag is washed with dilute sulfuric acid and used to extract germanium.

Embodiment 2

[0023] see figure 1 , add neutralizer zinc oxide calcine to the high-acid germanium extraction liquid (containing germanium 24mg / L) to adjust the pH to 1.0, control the heating temperature at 90°C, then add iron filings to reduce ferric ions, and control the temperature at 85°C After 20 minutes of reaction, a second batch of excess iron filings was added, the temperature was controlled at 95°C, the reaction time was 120 minutes, and the replacement rate of germanium could reach 93.8%. After liquid-solid separation, the replaced liquid needs to sink alum again to remove iron, and the replacement slag is washed with dilute sulfuric acid and used to extract germanium.

Embodiment 3

[0025] see figure 2 , add iron filings to reduce ferric ions to the liquid after iron removal (containing germanium 22mg / L), control the temperature at 95 ° C, after 20 minutes of reaction, add the second batch of excess iron filings, control the temperature at 85-95 ℃, the reaction time is 120min, and the replacement rate of germanium can reach 93.2%. After liquid-solid separation, the replaced liquid needs to sink alum again to remove iron, and the replacement residue is washed with dilute acid and used to extract germanium.

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Abstract

The invention discloses a method for enriching germanium from a wet process zinc smelting system. The method comprises the following process steps of: pre-neutralizing germanium extracting stock solution; weakly reducing; replacing reduced germanium; cleaning replacement residue; extracting germanium; opening a path and removing iron and the like. The method comprises the following specific steps of: firstly, pre-neutralizing pickle liquor (or liquid obtained from iron removal by jarosite process) with high germanium content by using a small amount of neutralizing agent and controlling the pH of a reaction final point to be between 1.0 and 4.5; secondly, adding a slightly excess amount of reducing agent such as zinc powder or scrap iron to replace germanium; and lastly, after reaction, separating excessive zinc powder or the scrap iron, separating solid from liquid to obtain copper germanium residue with high germanium grade and extracting germanium. Germanium replacement rate is high, and germanium residue has high grade and is easy to treat; moreover, the method is easy to operate, has easily-controllable process condition and low cost and is suitable for the requirement of industrial production.

Description

technical field [0001] The invention relates to a method for enriching germanium from a zinc hydrometallurgy system, in particular to a treatment method for high-germanium liquid in the lead-zinc smelting process. Background technique [0002] In the conventional zinc hydrometallurgy process, in order to improve the recovery rate of zinc, it is usually necessary to perform high-temperature and high-acid leaching on the intermediate leaching residue generated in the production process to reduce the zinc content in the intermediate leaching residue. Then carry out the treatment of sinking alum and removing iron. The content of germanium in the obtained alumite-removed solution reaches 10-35mg / L, and is returned to the neutral leaching process. This process improves the recovery rate of zinc, but germanium will accumulate in the solution, which will lead to a large workload of solution purification in the next step, and more zinc powder consumption, which will seriously affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/46C22B41/00
CPCY02P10/20
Inventor 楚广周兆安楚盛杨天足
Owner CENT SOUTH UNIV
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