Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for improving the leaching rate of zinc indium in secondary zinc oxide

A technology for secondary zinc oxide and leaching rate is applied in the field of improving the leaching rate of zinc and indium in secondary zinc oxide, which can solve the problems of large acid mist, high energy consumption, long processing time, etc., so as to reduce the initial acid concentration of sulfuric acid and improve the processing time. Efficiency, the effect of raising the reaction temperature

Active Publication Date: 2017-07-07
SHUI KOU SHAN NONFERROUS METALS LTD
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic treatment of indium-containing materials mostly adopts the two-stage acid leaching technology of low-acid leaching and high-acid leaching. Equipped with professional acid mist absorption equipment, it is difficult to maintain the temperature for a long time, and the energy consumption is high. In the leaching process, it is necessary to add such as H 2 o 2 、HNO 3 - , MnO 4 - , manganese powder and other oxidants; the total leaching rate of indium in the low-acid process plus high-acid process is still in the range of 60% to 80%, which cannot be further improved, and the traditional low-acid plus high-acid leaching process is intermittent production, the degree of automation Low, high material handling costs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Neutral leaching: The secondary zinc oxide was mixed with zinc electrolytic waste solution containing sulfuric acid at a concentration of 15 g / L for leaching reaction. The temperature of the leaching reaction was 70°C, and the leaching time was 2 h. The pH value at the end point is 5.0; the middle immersion liquid and the underflow are obtained through solid-liquid separation, and the obtained middle immersion liquid is sent to the zinc smelting system to recover zinc, and the obtained underflow enters the process of step (2);

[0042] (2) Low-acid leaching: Mix the underflow obtained in step (1) with the oxygen pressure acid leaching solution according to the solid-to-liquid ratio of 1:4g / mL for leaching reaction, wherein the temperature of the leaching reaction is 80°C, and the leaching time is 4 h, the concentration of leaching final acid is 20g / L. The low-acid leaching residue and low-acid leaching solution are obtained through solid-liquid separation, and the o...

Embodiment 2

[0046] (1) Neutral leaching: The secondary zinc oxide was mixed with zinc electrolytic waste solution containing sulfuric acid at a concentration of 20 g / L for leaching reaction. The temperature of the leaching reaction was 75°C, and the leaching time was 2.5 h. The pH value at the end point is 5.1; the middle immersion liquid and the underflow are obtained through solid-liquid separation, and the obtained middle immersion liquid is sent to the zinc smelting system to recover zinc, and the obtained underflow enters the process of step (2);

[0047] (2) Low-acid leaching: Mix the underflow obtained in step (1) with the oxygen pressure acid leaching solution according to the solid-liquid ratio of 1:6g / mL for leaching reaction, wherein the temperature of the leaching reaction is 85°C, and the leaching time is 4 h, the concentration of leaching final acid is 25g / L. The low-acid leaching residue and low-acid leaching solution are obtained through solid-liquid separation, and the ob...

Embodiment 3

[0051] (1) Neutral leaching: Mix secondary zinc oxide with zinc electrolytic waste solution containing sulfuric acid at a concentration of 25 g / L for leaching reaction, wherein the temperature of the leaching reaction is 80°C, the leaching time is 3 hours, and the end point of the leaching reaction is The pH value is 5.2; the middle immersion liquid and the underflow are obtained through solid-liquid separation, and the obtained middle immersion liquid is sent to the zinc smelting system to recover zinc, and the obtained underflow enters the process of step (2);

[0052] (2) Low-acid leaching: Mix the underflow obtained in step (1) with the oxygen pressure acid leaching solution at a solid-to-liquid ratio of 1:8g / mL for leaching reaction, wherein the temperature of the leaching reaction is 90°C, and the leaching time is 4 h, the concentration of leaching final acid is 30g / L. The low-acid leaching residue and low-acid leaching solution are obtained through solid-liquid separati...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for increasing the leaching rate of zinc and indium in secondary zinc oxide comprises the following steps that firstly, neutral leaching is carried out, secondary zinc oxide and a sulfuric acid solution are mixed to carry out the leaching reaction, neutral leaching liquor and base flow are obtained through solid and liquid separation, and the base flow is executed in the second step; secondly, low-acid leaching is carried out, the base flow obtained in the first step is mixed with oxygen pressure acid step to carry out the leaching reaction, low-acid leaching residues and low-acid step are obtained through solid and liquid separation, and the low-acid leaching residues are executed in the third step; and thirdly, oxygen pressure acid leaching is carried out, zinc electrolysis waste liquid is added in the low-acid leaching residues for slurrying so that seriflux can be obtained, the obtained seriflux is added in a high-pressure reaction kettle, heating is carried out through high-temperature steam, industrial oxygen is pressurized to participate in the leaching reaction, and oxygen pressure acid leaching residues and oxygen pressure acid leaching liquid are obtained throughsolid and liquid separation. By means of the method, the initial acid concentration of sulfuric acid can be reduced, the reaction temperature is increased, and the reaction time is shortened; interrupted production is changed into continuous production, the material treating cost is reduced, the indium leaching rate can reach more than 92%, and the zinc leaching rate can reach more than 95%.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a method for increasing the leaching rate of zinc and indium in secondary zinc oxide. Background technique [0002] As a rare metal, indium has an abundance in the earth's crust of only 0.11×10 -6 , often associated with zinc, lead, copper, tin and other ores in small amounts, and can only be recovered from the by-products of these non-ferrous metal smelting. Indium has very unique physical and chemical properties, such as low melting point, high boiling point, good conductivity, strong plasticity, etc. It is widely used in high-tech fields such as electronic computers, communications, national defense and military industry, and aerospace. [0003] At present, the domestic treatment of indium-containing materials mostly adopts the two-stage acid leaching technology of low-acid leaching and high-acid leaching. Equipped with professional acid mist absorption equipme...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B19/00C22B58/00
CPCY02P10/20
Inventor 付绸琳何从行谭振华张晓林杜红陈国兰付高明
Owner SHUI KOU SHAN NONFERROUS METALS LTD