A method for recovering manganese from zinc electrolysis anode slime

A technology of anode slime and zinc electrolysis, applied in the direction of improving process efficiency, can solve the problems of increased separation and extraction difficulty, low manganese recovery rate, and high impurities, and achieves the advantages of hydrometallurgical separation and recovery, short reduction roasting time, and leaching recovery. high rate effect

Active Publication Date: 2019-08-13
六盘水中联工贸实业有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Apparently, the conventional reduction roasting takes a long time, consumes a lot of energy, produces large waste gas pollution, and has a cold center, and the reduction roasting rate is 80-90%. 90%, and it is more difficult to increase it. Direct reduction leaching generally requires the addition of sulfite 2-3 times the amount of manganese dioxide, and the leaching level is above 3
Not only the consumption of sulfite is high and the cost is high, but also the leaching solution brings in a large amount of alkali metal or alkaline earth metal ions, which causes troubles for the production and application of manganese products
Using high chloride ion leaching containing more than 250g / L of chloride ions, no reducing agent can be added, but the leachate will also contain manganese chloride, PbCl 4 2- , AgCl 2 - , not only increases the difficulty of separation and extraction, the purity of the obtained manganese product is not high, but also the high chlorine wastewater is difficult to treat

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

[0021] Example 1: An enterprise produces zinc electrolysis anode slime containing 38.5% manganese, 13.2% lead, 650g / ton silver, and 13.55% zinc sulfate. First wash the zinc sulfate in hot water at 80°C until the zinc content is less than 50.5mg / L. The total washing water volume is 5.2 times that of the raw material. Zinc leaching system. Add C / manganese dioxide = 0.2 times carbon black powder (particle size 60 mesh) to the anode slime after washing and dezincification, stir and mix evenly, put it in a microwave oven and adjust the microwave frequency to 100GHz, power 1000W, and radiate for 30 minutes, the highest When the temperature reaches 700°C, the raw material massive manganese dioxide is refined, the color becomes lighter, and mixed with sporadic yellow particles.

[0022] Put the anode slime after microwave radiation in the leaching tank and use 150g / L sulfuric acid solution for leaching, liquid / solid = 3-4, leaching temperature 90±5°C, leaching time for one time 2 hou...

Embodiment 2

[0023] Embodiment 2: Use the zinc electrolysis anode slime of embodiment 1 to wash with hot water until the zinc content is 15 mg / L, then add carbon black powder according to C / manganese dioxide=0.3 and mix evenly, then put it into a microwave oven, and control the microwave The power is 750W, after 40 minutes of microwave radiation, carry out two leaching according to the leaching conditions of Example 1, the second leaching residue contains 1.5% manganese, and the manganese leaching rate is 97.8%. , the resulting primary leaching solution contains 45g / L of manganese ions. After neutralization and purification by ammonium bicarbonate and ammonium sulfide, the total amount of heavy metal impurities in the purified solution is 1.3mg / L, and PH=5. According to the technical requirements of electrolytic manganese, ammonia water and Ammonium sulfate and electrolytic additive SeO 2 The electrolyte is prepared for electrolysis of manganese metal, the current efficiency is 68.5%, and ...

Embodiment 3

[0024] Example 3: A certain zinc electrolysis anode slime contains 42.5% manganese, 10.3% lead, 350g / ton silver, and 11.5% zinc sulfate. After washing according to the conditions of Example 2, add coke powder with C / manganese dioxide=0.3, particle size 40 After mixing uniformly, carry out microwave irradiation for 40 minutes, then carry out primary leaching with the secondary leaching liquid of embodiment 2, carry out secondary and three leaching with the electrolytic metal manganese residual liquid of embodiment 2, primary leaching liquid contains manganese ion 47.2g / L, The leaching slag contains 0.72% manganese, and the manganese leaching rate is 98.8%. The primary leaching solution was neutralized and purified with ammonium bicarbonate and ammonium sulfide to PH = 6, the content of lead and zinc was 0.58mg / L, ammonium sulfate was added to 120g / L and electrolytic additives were electrolyzed to obtain metal manganese quality of 99.72% and current efficiency of 71.2%.

[0025]...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for recycling manganese from zinc electrolysis anode mud. The method comprises the steps that the zinc electrolysis anode mud is washed with hot water till the zinc concentration is smaller than 100 mg / L, carbon black or charcoal dust or coke dust is added according to the ratio of C to manganese dioxide being 0.2-0.3, the mixture is mixed to be uniform and placedinto a microwave field to be radiated for 30-40 min and leached through sulfuric acid, ammonium bicarbonate and ammonium sulfide are added to neutralize and purify leachate till the PH is 4-5 and thezinc and lead concentration is smaller than 5mg / L, ammonium hydroxide, industrial grade ammonium sulfate and electrolytic additive are prepared for electrolyzing metal manganese, and lead and silver are recycled from silver-containing lead sulfate slag through a conventional hydrometallurgy method. The method recycles manganese from zinc electrolysis anode mud, accordingly, energy saving and emission reduction can be achieved, and the maximum economic benefits can be achieved.

Description

technical field [0001] The invention belongs to the field of application of microwave technology in hydrometallurgy, and specifically relates to zinc electrolysis anode slime washed with water and dezincified, adding carbon elements and mixing evenly, and performing short-term, high-efficiency, low-pollution manganese dioxide and dihydrogen in a microwave field. The reduction reaction of lead oxide makes the manganese in it easy to be leached with sulfuric acid, separated from lead and silver to achieve efficient recovery of manganese. Background technique [0002] Zinc electrolytic anode slime generally contains 30-40% manganese, 10-15% lead, and more than 500g / ton silver. It also contains about 20% zinc sulfate before washing. The manganese in it is mainly manganese oxide, which is insoluble in acid and alkali, so it is impossible to directly return to zinc leaching as an oxidant and replenish manganese ions in zinc sulfate, and returning to use is a waste of manganese re...

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): C22B7/00C22B47/00
CPCC22B7/007C22B47/00Y02P10/20
Inventor 李世平钟波
Owner 六盘水中联工贸实业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap