Recovery method for valuable metals in tailings

A valuable metal, recovery method technology, applied in the direction of improving process efficiency, can solve the problems of consuming sulfuric acid, wasting secondary resources, large amount of waste liquid, etc., and achieving a short process flow, strong adaptability, and high recovery rate. Effect

Inactive Publication Date: 2014-11-26
BEIJING GENERAL RES INST OF MINING & METALLURGY
View PDF8 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the utilization of tailings at home and abroad is not ideal
Many enterprises directly sell it to cement factories at a low price and use it as a cement ingredient. Although this method is straightforward and simple, it wastes secondary resources; the enhanced treatment method requires additives, which not only increases production costs, but also cannot comprehensively recycle other useful materials. Valuable metals; the high-acid leaching process can effectively recover gold and silver, and can also comprehensively recover some other valuable metals...

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Recovery method for valuable metals in tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a method for recovering valuable metals such as gold and silver in tailings. The tailings are high-sulfur concentrate cinders, and the main components (weight unit: g / t): Au 2.26, Ag 39.61, Fe 62.13, S 0.54, Cu 0.28, Pb 0.32, Zn 0.35, SiO 2 5.15, As 0.07, the tailings particle size is -200 mesh, accounting for 90% (referring to 90% of tailings below 200 mesh); use the mixer to mix tailings, bentonite, calcium chloride (chlorinating agent) by 100: Mixing at a weight ratio of 1:5, after mixing, the raw materials are hoisted into the mine bin, fed continuously to the disc granulator, and at the same time, spray production water into the granulator to control the water content of the wet pellets to 10-15%. The particle size is 8-10mm; the wet pellets are sent to the grate silo through the belt, and the drying capacity of the grate is adjusted by adjusting the height of the ram (ie, the height of the material layer), and the drying temperature is con...

Embodiment 2

[0037] This embodiment provides a method for recovering valuable metals such as gold and silver in tailings. The tailings are cyanide tailings. The main components (weight unit: g / t): Au 13.2, Ag 13, Fe 43.65, S 2.65, Cu 0.35, Pb 0.21, Zn 0.10, SiO 217.66, As 1.45, tailings particle size-300 order 85%; Adopt the same step of embodiment 1; In chlorination roasting process, gold volatilization rate 92%, silver volatilization rate 73%, copper volatilization rate 85%, lead volatilization rate 90%, zinc volatilization rate 73.2%; in this technological process, the recovery rate of gold is 91.2%, the recovery rate of silver is 70%, the recovery rate of copper is 82.5%, the recovery rate of lead is 88%, and the recovery rate of zinc is 71.5%.

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 recovery method for valuable metals in tailings, and belongs to the field of treatment for tailings of nonferrous metallurgy. The method comprises the following steps of: mixing the tailings, bentonite and a chlorinating agent, then wet-grinding to generate green balls, drying the green balls and then carrying out chloridizing roasting in a rotary kiln, cooling the roasted balls to obtain qualified pellets, discharging the smoke generated during roasting through multi-stage washing, and conveying smoke dust containing the valuable metals in solution to form recovery solution; filtering the recovery solution to obtain a filter cake, that is, gold-silver-lead residues, and treating the gold-silver-lead residues to recover gold, silver and lead; adsorbing the filtrate after filtering through active carbon, and neutralizing by lime to obtain neutralized filter residue, that is, copper-lead-zinc residues, and treating the copper-lead-zinc residues to recovery copper, zinc and lead; and evaporating and concentrating the filtrate after neutralization, and then recovering the chlorinating agent. The method has the advantages of being low in requirements on the treated raw materials, high in adaptability, short in process flow, low in cost, simple to operate, high in recovery rate, and the like.

Description

technical field [0001] The invention relates to the field of tailing slag treatment of nonferrous metallurgy, in particular to a method for comprehensively recovering valuable metals from tailing slag. Background technique [0002] The main chemical composition of non-ferrous metallurgical tailings is: SiO 2 , Fe 2 o 3 , In addition, it also contains valuable metal elements such as Au, Ag, Cu, Pb, Zn, etc. Usually, the grade of gold is about 2-5g / t, and some are even as high as 8-10g / t. The tailings are rich in valuable metals and are secondary resources with high utilization value. [0003] At present, the utilization of tailings at home and abroad is not ideal. Many enterprises directly sell it to cement factories at a low price and use it as a cement ingredient. Although this method is straightforward and simple, it wastes secondary resources; the enhanced treatment method requires additives, which not only increases production costs, but also cannot comprehensively r...

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
IPC IPC(8): C22B7/04C22B11/00C22B13/00C22B15/00C22B19/00
CPCY02P10/20
Inventor 王云袁朝新郭持皓常耀超孙留根李大江李云徐晓辉刘大学黄海辉孙聪余群波韦其晋胡磊王为振梁东东
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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