Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for the recovery of gold from sulphide concentrate

A technology for recovery of sulfide and gold, applied in the direction of improving process efficiency, etc., can solve problems such as large demand for neutralization, oxidation, and difficulty in dissolving chalcopyrite, and achieve the effect of increasing gold output

Inactive Publication Date: 2008-02-06
OUTOTEC OYJ
View PDF5 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the bioleaching method is that chalcopyrite is difficult to dissolve and oxidize all the concentrate to sulfate, where the need for neutralization is great
Also, leaching gold with cyanide is very risky for the environment

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
  • Method for the recovery of gold from sulphide concentrate
  • Method for the recovery of gold from sulphide concentrate
  • Method for the recovery of gold from sulphide concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Prepare a mixture of 50% copper concentrate and 50% gold concentrate. The gold concentrate represents the refractory type and its gold yield was 3% in the 24-hour cyanide leach test. Mineralogical studies have shown that most of the undissolved gold in the gold concentrate is bound to pyrite and arsenopyrite as "invisible gold". The distribution of gold between pyrite and arsenopyrene is approximately 50:50. The chemical composition of the concentrate is shown in Table 1, and the mineral composition of the main minerals is shown in Table 2.

[0059] Table 1. Composition of concentrates and blended concentrates

[0060] Cu%

[0061] Table 2. Mineral composition of leached raw materials

[0062] Chalcopyrite %

[0063] Laboratory scale chloride leaching of mixed concentrates in a 10 liter titanium reactor using HydroCopper process conditions:

[0064] Solution volume: 9.0 liters

[0065] Solid mass: 1.6kg

[0066] Temperature: 95°C

[0067] Ho...

Embodiment 2

[0097] The chloride leached and physically separated product (underflow) shown in Example 1 was pressure leached in a 1.5 liter titanium autoclave under the following conditions:

[0098] Solid mass: 200g

[0099] Solution volume: 1.2 liters

[0100] Oxygen flow: 1.01 / min

[0101] Temperature: 200°C

[0102] Hold time: 2 hours

[0103] Oxygen overpressure: 7 bar

[0104] The solid content after treatment is as follows:

[0105] Table 6. Solid composition after pressure leaching treatment

[0106] Raw material mass%

Embodiment 3

[0108] The residue obtained from the pressure leaching of Example 2 was subjected to chloride leaching under HydroCopper process conditions.

[0109] Solution volume: 1.2 liters

[0110] Solid mass: 0.12kg

[0111] Temperature: 95°C

[0112] Hold time: 24 hours

[0113] Oxidizing agents: chlorine, air

[0114] NaCl: 280g / l

[0115] Cu 2+ Content: 40g / l

[0116] pH: 2.0-2.2

[0117] Redox potential: 580-650mV (relative to Ag / AgCl)

[0118] The composition of the leach residue is as follows:

[0119] Table 8. Solid composition of pressure leaching residue after chloride leaching

[0120] raw material

[0121] The gold yield of the autoclave residue in the chloride leach was 93.9%. When calculating the whole chain from the original concentrate (Table 2), the gold yield was 93.8%.

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
electric potential / voltageaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for recovering gold from a sulphidic concentrate, particularly one containing arsenopyrite and / or pyrite, hydro- metallurgically. The concentrate is first subjected to leaching with a concentrated solution of alkali chloride and copper (II) chloride, by means of which the copper minerals and some of the gold in the concentrate are made to dissolve. Elemental sulphur and precipitated iron and arsenic compounds are separated from the leaching residue using physical separation methods, whereby the first intermediate is obtained, which contains gold- bearing sulphide minerals and gangue minerals as well as the gold that remains undissolved. The free gold that remains undissolved is separated by means of gravity separation methods. After gravity separation, additional comminution is carried out, after which the sulphide minerals are decomposed and the gold-containing solution or residue is routed to the concentrate leaching circuit.

Description

technical field [0001] The present invention relates to a process for the hydrometallurgical recovery of gold from sulphide concentrates, in particular from sulphide concentrates containing arsenopyrite and / or pyrite. The concentrate is first leached with a concentrated solution of alkali metal chlorides and copper(II) chloride, whereby the copper minerals and some gold in the concentrate are dissolved. Elemental sulfur and precipitated iron and arsenic compounds are separated from the leach residue using physical separation methods to obtain a first intermediate product containing gold-bearing sulfide and gangue minerals and undissolved gold. Undissolved free gold is separated by gravity separation. After gravity separation, additional comminution is performed, after which the sulphide minerals are broken down and the gold-bearing solution or residue is sent to the concentrate leaching cycle. Background technique [0002] Copper concentrates contain various amounts of gol...

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): C22B11/00C22B3/10C22BC22B15/00
CPCC22B11/04C22B15/0086C22B15/0069Y02P10/20C22B11/06
Inventor J·莱皮宁O·许韦里宁S·海马拉V·帕罗萨里M·海迈莱伊宁(已死亡)
Owner OUTOTEC OYJ
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com