Method for floatation-recovering valuable metals in superfine cyanided tailings by using high-cyanogen backwater

A technology for cyanidation of tailings and valuable metals, applied in flotation, process efficiency improvement, solid separation, etc., can solve the problems of inability to comprehensively recover multiple metals, increase the difficulty of element separation, and difficulty in metal recovery, etc. Achieve a win-win situation in the economic environment, increase new output value, and stabilize production indicators

Active Publication Date: 2014-10-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) After the gold concentrate is ultra-finely ground, the specific surface area increases, and the dispersion system is "colloid-like", which makes it difficult to separate by flotation;
[0005] (2) Part of the metal minerals in the cyanidation process are strongly inhibited due to excessive oxidation and are difficult to activate;
[0006] (3) Most of the minerals are in the state of co-association, and the elements interact with each other, which increases the difficulty of separation between the elements
The multi-metal recovery of ultra-fine cyanide slag under high-cyanide backwater is very difficult or even impossible to comprehensively recover multiple metals, which brings great economic losses to enterprises.

Method used

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  • Method for floatation-recovering valuable metals in superfine cyanided tailings by using high-cyanogen backwater
  • Method for floatation-recovering valuable metals in superfine cyanided tailings by using high-cyanogen backwater
  • Method for floatation-recovering valuable metals in superfine cyanided tailings by using high-cyanogen backwater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Stirring and pulping: The tailings from the cyanidation gold extraction operation are concentrated by a thickener, and the underflow is fed into the slurry mixing tank, and the high-cyanide return water from the cyanidation operation is used for pulping, and the mass concentration of the pulp is controlled at 40%. After 25 minutes, the pulp is fully dispersed and then enters the lead-zinc-copper separation operation;

[0041] (2) Prioritize lead flotation: Send the pulp to the flotation unit, adjust the pH value of the pulp to 10 with lime, and recover lead by using a process of first roughing, second finishing and second sweeping;

[0042] The rough selection conditions described therein are:

[0043] Add 2 kg / t of zinc sulfate, 50 g / t of sodium hydrosulfide, 40 g / t of xanthate, 15 g / t of ethion, and 15 g / t of terpineol oil;

[0044]The primary refining conditions are: adding 500 g / t of zinc sulfate and 50 g / t of sodium hydrosulfide; the secondary refining conditi...

Embodiment 2

[0062] (1) Stirring and pulping: the tailings from the cyanidation gold extraction operation are concentrated by a thickener, and the underflow is fed into the slurry mixing tank, and the high-cyanide return water from the cyanide operation is used for pulping, and the mass concentration of the pulp is controlled at 38%. After 30 minutes, the pulp is fully dispersed and then enters the lead-zinc-copper separation operation;

[0063] (2) Prioritize lead flotation: Send the pulp to the flotation unit, adjust the pH value of the pulp to 10 with lime, and recover lead by using a process of first roughing, second finishing and second sweeping;

[0064] The rough selection conditions described therein are:

[0065] Add 1kg / t of zinc sulfate, 120 g / t of sodium hydrosulfide, 30g / t of butyl xanthate, 10g / t of ethion, and 20g / t of terpineol oil;

[0066] The primary refining conditions are: adding 600 g / t of zinc sulfate and 70 g / t of sodium hydrosulfide; the secondary refining conditi...

Embodiment 3

[0085] (1) Stirring and pulping: The tailings from the cyanidation gold extraction operation are concentrated by a thickener, and the underflow is fed into the slurry mixing tank, and the high-cyanide return water from the cyanide operation is used for pulping, and the mass concentration of the pulp is controlled at 45%. After 20 minutes, the pulp is fully dispersed and then enters the lead-zinc-copper separation operation;

[0086] (2) Prioritize lead flotation: send the pulp to the flotation unit, adjust the pH value of the pulp to 11 with lime, and recover lead by using the process of first roughing, second finishing and second sweeping;

[0087] The rough selection conditions described therein are:

[0088] Add 2kg / t of zinc sulfate, 10 g / t of sodium hydrosulfide, 50 g / t of fenugreek, 20 g / t of ethion, and 10 g / t of pinitol oil;

[0089] The primary refining conditions are: adding 550 g / t of zinc sulfate and 60 g / t of sodium hydrosulfide; the secondary refining conditions...

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Abstract

The invention belongs to the field of wet metallurgy, and particularly relates to a method for carrying out floatation recovering of valuable metals in superfine cyanided tailings by using high-cyanogen backwater. The method comprises the following steps: firstly, carrying out pulp mixing by utilizing a method for carrying out floatation recovering of valuable metals in superfine cyanided tailings by using high-cyanogen backwater during cyaniding operation, delivering the ore pulp to a flotation unit, regulating the pH of the ore pulp to be 10-12 with lime, recovering lead by adopting 'one-roughing, two-cleaning and two-scavenging' flow, concentrating the lead scavenged tailings and then adding into high-cyanogen backwater for mixing pulp, recovering zinc-lead concentrate by adopting 'one roughing, one cleaning and one scavenging' flow, concentrating the zinc-lead scavenged tailings and then adding into high-cyanogen backwater for mixing pulp, recovering copper concentrate by adopting 'one roughing, three cleaning and two scavenging' flow, carrying out twice scavenging on the copper scavenged tailings again, finally concentrating, and enabling bottom flow to flow through a filtering machine to obtain a concentrate product. Floatation is carried out by utilizing high-cyanogen high-base backwater and adopting combined floatation and inhibition chemicals, the separation and recovery of lead, zinc, copper and sulfur can be realized, and various valuable metals in the cyanided tailings can be effectively utilized.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for recovering valuable metals in superfine cyanide tailings by flotation with high-cyanide backwater. Background technique [0002] Gold extraction by cyanidation is a commonly used technology for gold extraction in gold mines in the world. The advantage of this method is that the gold extraction effect is good, but the disadvantages are also very prominent, mainly because a large amount of cyanide tailings will be produced. These cyanidation tailings are fine in particle size, high in viscosity, complex in mineral composition, and contain highly toxic cyanide radicals and residual polluting chemicals. With the increasing scarcity of mineral resources, tailings as a secondary resource have received more and more attention. In addition to unleached gold and silver, cyanidation tailings also contain a large amount of valuable metals such as copper, lead, zinc,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B13/00C22B15/00C22B19/30B03D1/002
CPCY02P10/20
Inventor 杨洪英刘子龙陈国宝王德煜郭键柄丘学民金哲男佟琳琳
Owner NORTHEASTERN UNIV
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