Home Blogs Cyanidation Cyanidation Solution | What is an Efficient and Rapid Desorption Electrolysis System?

Cyanidation Solution | What is an Efficient and Rapid Desorption Electrolysis System?

LauraLaura Jul 31, 2022Jul 31, 2022 166166
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Zimbabwe Huangzhi gold proccessing plant project with 700tpd capacity.jpg

( Zimbabwe Huangzhi gold proccessing plant project with 700tpd capacity )

01 Introduction

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The  is mostly used for the treatment of gold-loaded carbon in the carbon pulp plant of gold mines, which can remove gold from the gold-loaded carbon and precipitate into high-grade gold mud matching system.

02 Features

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The desorption electrolytic carbon gold extraction system is an automatic control, high temperature, high pressure, cyanide-free desorption electrolytic carbon gold extraction equipment system with the characteristics of high efficiency, low consumption and fast speed. The system has a high degree of automation, complete safety facilities, excellent technical indicators, simple and convenient operation, and stable and reliable operation.

#1 Efficient

After the desorption and electrolysis is completed, the grade of lean carbon is mostly stable at a low level, and the desorption efficiency is high. When the grade of gold-loaded carbon is 3000g/t, the desorption rate can reach more than 96%;

The grade of lean carbon can be reduced by 3-4 times compared with the conventional desorption electrolysis device, which is beneficial to stabilize the discharge grade of carbon adsorption operation and improve the adsorption rate. Rate;

#2 Fast

The temperature of desorption and electrolysis can be as high as 150℃, and the working pressure of the system is as high as 0.5Mpa, which is 0.2-0.5MPa higher than that of the conventional system, so the desorption and electrolysis time is very fast, and all the desorption and electrolysis work can be completed within 12-14 hours, which is shorter than the working time of the conventional system nearly 3 times;

#3 Low consumption

The temperature of desorption and electrolysis is the same, no heat exchange is required, and the total power consumption is 1/2-1/4 of the conventional system due to the fast operation;

#4 Cyanide Free

There is no need to add sodium cyanide in the desorption solution, the cost is low, and there is no pollution.

The system can provide cathode materials according to user requirements; the grade of gold mud is also higher than that of conventional systems; no reverse electrolysis is required; it is easy to extract gold mud; it saves smelting costs;

#5 Automatic Control

Liquid level buffer mechanism - due to the liquid vaporization and system pressure changes during operation, the liquid volume of the system will fluctuate. For this reason, the system is specially equipped with a liquid level buffer mechanism, which can automatically offset the changes in the liquid level and always maintain The system operates normally;

Temperature control system - when the temperature reaches the set value, the system will automatically disconnect some electric heaters, and the remaining electric heaters will automatically maintain the working temperature of the system. In this way, the system temperature has been stabilized at the set value.

#6 Triple Safety Measures

In order to ensure the security of the system, three security measures are taken:

First, the system itself is intelligent. When the circulating pump is not running, the liquid in the system will not flow. In order to prevent the local high-temperature vaporization booster heater from automatically turning off. When the pressure rises at a certain position due to blockage, the electric heater also automatically stops working. After the circulating pump resumes operation or the pressure decreases, the electric heater will automatically start working;

The second is to have a special pressure release mechanism. When the system pressure rises to a certain value, the mechanism automatically opens the pressure relief and adjusts the pressure to a normal value;

The third is the safety valve, which only works if the above two measures fail together.

03 Structure

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The desorption electrolysis system is mainly composed of desorption part, electrolysis part, instrument control part, pipeline valve, etc. Each part penetrates each other to form a complete system

04 Working Principles

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The desorption electrolysis system is to add anions that are easily adsorbed by activated carbon in the desorption system, so as to replace Au(CN)2- to realize the desorption of gold. The precious liquid obtained by desorption of gold-loaded carbon is recovered by ionization method to obtain solid gold. Xinhai's high-efficiency, low-consumption and fast desorption electrolysis device is mainly composed of two parts: desorption and electrolysis. The processes of desorption and electrolysis are separated, so that the solvent is carried out in a comprehensive desorption tower, and the electrolysis of precious liquid is completed in a separate electrolytic cell. The four processes of desorption, precious liquid heating, solvent condensation and solvent recovery are centralized in the comprehensive desorption tower, and the precious liquid obtained after desorbing the gold-loaded carbon with the solvent vapor is introduced into an independently set electrolyzer through a pipeline for electrolysis to obtain crude gold. , and then purified to obtain finished gold.

05 Cases

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#Case1 Tanzania 1200tpd Gold Processing Plant Project

Project Overview: Tanzania 1200tpd Gold Processing Plant Project is a full mining industry chain service (EPC+M+O) project contracted by Xinhai Mining. The project ore is mainly two kinds of sulfide ore and oxide ore. The grade of oxidized ore is 2.4g/t, and gold is the only valuable element that can be recovered. The gold leaching rate of all-slime cyanidation gold extraction process can be 93.75%; the gold content of sulfide ore is 10.7g/t, and gold is the only resource. The gold leaching rate of all-slime cyanidation gold extraction process is 91.58%.

Solution: all-slime cyanidation process.

Project results: Tanzania 1200tpd Gold Processing Plant Project adopts the all-slime cyanidation process. In the early stage of the project, Xinhai Mining has made comprehensive and meticulous planning in terms of project management, construction technology, resource supply, and coordination. During the construction of the project, Xinhai Mining took all measures into consideration, effectively coping with the serious shortage of material supply, construction machinery, machinery, and skilled workers in the project implementation area. Most of the equipment required in this project are thin-walled tanks. With the efficient and reasonable measures of Xinhai Mining, the deformation problem of non-standard equipment during hoisting and transportation has been effectively solved, and the construction quality of the project has been ensured.

Case 1 Tanzania 1200tpd gold processing plant project.jpg

( Case 1 Tanzania 1200tpd gold processing plant project )

#Case2 Sudan 700tpd Gold Processing Plant Project

Project overview: The ore of the Sudan 700tpd Gold Processing Plant Project contains 2.97g/t gold, most of which are clay minerals, with a particle size of less than 2mm, and a small part of block, with a maximum particle size of 70mm. Xinhai Mining provided it with full mining industry chain services (EPC+M+O) including "design and research - complete equipment manufacturing and procurement - commissioning and delivery - mine management and operation".

Solution: all-slime cyanidation process. The crushing section adopts a section of open-circuit crushing, and the grinding section adopts a closed-circuit grinding process. The grinding products are extracted by cyanidation carbon slurry method. , the leaching tailings are dry piled after filter press dehydration.

Project results: Sudan 700tpd Gold Processing Plant Project was successfully put into operation and obtained qualified products, bringing considerable profits; and on the basis of the original personnel, some employment opportunities were added, resulting in good social benefits. In addition, Xinhai Mining has put forward control measures for waste water, roasting waste gas, noise, leaching slag, smelting flue gas, final tailings, production dust, domestic waste, etc. that have an impact on the environment to ensure that it does not affect the surrounding environment and has a good It realizes the unification of economic, environmental and social benefits.

Case 2 Sudan 700tpd gold processing plant project.jpg

( Case 2 Sudan 700tpd gold processing plant project )

#Case3 Indonesia 100tpd Gold Processing Plant Project

Project overview: The Au grade of Indonesia 100tpd Gold Processing Plant Project is 5.75g/t, the true ore density is 2.62t/m3, and the ore bulk density is 1.32t/m3. Gold ore is the main recycling object.

Solution:

Ore washing-crushing-grinding classification-cyanidation leaching process flow;

In the washing stage, the vibrating screen is used to wash the ore, and the washed ore is sent to the crushing system for crushing. The crushing stage adopts a two-stage open-circuit crushing process, and the final product particle size is -15mm. In the grinding stage, a closed-circuit grinding and grading process is adopted. The grinding products are screened by a dust removal screen, and then flow under the screen to the thickener for concentration. The bottom flow of the thickener is pumped to the leaching operation through the slurry. Gold-loaded carbon is obtained, and then desorption electrolysis high temperature and high pressure desorption is used to obtain gold mud. Finally, the gold mud is smelted into alloyed gold, and the leached tailings are dehydrated by a filter press, the return water is recycled, and the dry tailings are transported to the tailings pond for storage.

Project results: In terms of professional civil engineering design, Xinhai Mining has designed the relevant mine silos, platforms and design foundations on the ground as steel structures as much as possible, and the pools use the original heap leaching pools. Although there are many challenges in civil construction and equipment installation in the process of cross-regional and cross-cultural project cooperation, Xinhai Mining still actively communicates with customers, patiently answers the questions raised by the other party for many times, and makes some drawings according to the site conditions. Adjustment to ensure that the project is foolproof; in the equipment installation stage, the installation and commissioning personnel are all old technicians who participated in the customer's mine design. In the end, the economic benefits of the gold mine project far exceeded expectations and were highly recognized by customers.

Case 3 Indonesia 100tpd gold processing plant project.jpg

( Case 3 Indonesia 100tpd gold processing plant project )

06Summary

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In this paper, we mainly deepen our understanding by describing the characteristics, working principles and cases of the desorption electrolysis system. If you want to know more about the analytical electrolysis equipment, welcome to click the Chat button to consult and discuss.



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