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

Method for removing fluorine and chlorine from zinc sulfate solution

A zinc sulfate solution, fluorine and chlorine technology, applied in the field of fluorine and chlorine removal, can solve the problems of introducing excess copper ions into the main system and difficult control of copper slag oxidation

Inactive Publication Date: 2017-02-08
BEIJING GENERAL RES INST OF MINING & METALLURGY
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The copper slag method uses self-produced copper slag to remove chlorine better, but because the oxidation of copper slag is difficult to control, it is easy to introduce excess copper ions into the main system

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

[0017] Add 100ml of pre-supernatant solution (47.8mg / L of fluorine, 405mg / L of chlorine, 5.58g / L of iron) into the reaction bottom liquid at a rate of 3.8mL / min, keep the temperature at 90°C, adjust the rate of adding milk of lime to control the pH Around 2.8. After the pre-supernatant is completely added, react for half an hour, and the reacted liquid is filtered to separate the goethite slag and the iron-removed liquid. The removal rates of fluorine and chlorine are 26.4% and 38.5% respectively, and the removal rate of iron is 95.0%.

Embodiment 2

[0019] Add 100ml of pre-supernatant solution (47.8mg / L of fluorine, 405mg / L of chlorine, 5.58g / L of iron) into the reaction bottom liquid at a rate of 3.8mL / min, keep the temperature at 90°C, adjust the rate of adding milk of lime to control the pH Around 3.0. After the pre-supernatant is completely added, react for half an hour, and the reacted liquid is filtered to separate the goethite slag and the iron-removed liquid. The removal rates of fluorine and chlorine are 39.6% and 21.4% respectively, and the removal rate of iron is 96.9%.

Embodiment 3

[0021] Add 100ml of pre-supernatant solution (47.8mg / L of fluorine, 405mg / L of chlorine, 5.58g / L of iron) to the reaction bottom liquid at a rate of 11mL / min, keep the temperature at 90°C, adjust the rate of adding milk of lime to control the pH at 3.0 ~ 3.2 or so. After the pre-supernatant is completely added, react for half an hour, and the reacted liquid is filtered to separate the goethite slag and the iron-removed liquid. The removal rates of fluorine and chlorine are 51.5% and 32.0% respectively, and the removal rate of iron is 97.5%.

[0022] Implementation of oxidation method (V.M method)

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

The invention discloses a method for removing fluorine and chlorine from a zinc sulfate solution, belongs to the zinc metallurgy purification field and relates to a method for removing fluorine and chlorine at the same time from an iron-containing solution through a goethite method. Two implementation manners of a dilution method and a reduction-oxidation method exist. According to the dilution method, an iron-removing precursor solution is added into a base solution, fluorine and chlorine are removed along with the iron-removing process, the precursor solution contains 3-50 g / L ferric iron, the reacting temperature is 70-100 DEG C, pH is 2.5-4.5, and the adding speed of the precursor solution is 2-9.2 mL / min. According to the reduction-oxidation method, air or oxygen-enriched air is introduced into the iron-removing precursor solution, fluorine and chlorine are removed along with oxidation precipitation of divalent iron, the precursor solution contains 3-50 g / L divalent iron, the flow rate of the air or the oxygen-enriched air is 5-50 L / min, the reacting temperature is 70-100 DEG C, pH is 2.5-4.5, and the reacting time is 2-8 h. By means of the method, fluorine and chlorine can be removed at the same time, the method depends on the iron-removing process essential for the process, no special fluorine and chlorine removing process needs to be added, and extra investment is not needed.

Description

technical field [0001] The invention belongs to the field of zinc metallurgy purification and relates to a method for removing fluorine and chlorine from zinc sulfate solution. Background technique [0002] During the zinc hydrometallurgy process, the existence of fluorine and chlorine has a great impact on system equipment and the environment. When the fluorine and chlorine content reaches a certain value, the cathode and anode of the electrolysis will be consumed and the working environment will deteriorate. During the electrowinning process of zinc sulfate, fluoride ions can destroy the aluminum oxide film on the surface of the cathode aluminum plate, so that the precipitated zinc and the fresh surface of the aluminum plate form zinc-aluminum alloy, which makes it difficult to peel off the zinc skin and increases the consumption of the cathode aluminum plate. Chloride ions react with anode lead after being oxidized to chlorate, increasing the lead content in the electrol...

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 Applications(China)
IPC IPC(8): C22B3/44C22B19/20
CPCC22B3/44C22B19/26Y02P10/20
Inventor 蒋开喜王海北王玉芳胡一航
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY