Wherever your operation may be, whatever your processing requirements, Multotec will help ensure your gold processing plant is optimised to deliver the lowest cost per ton.
We offer a wide range of ore processing equipment, from single parts to complete plants to ensure you achieve your processing goals.
Our gold processing solutions feature:
When partnering with Multotec, you’ll get over 45 years of global mineral processing experience and a strong local distribution network, ensuring continuous plant process optimisation to achieve your processing solutions.
Multotec designs, engineers and supplies, gold processing equipment for both greenfield and brownfield projects, working with you to achieve speedier gold recovery rates.
Meeting the highest global and local manufacturing standards, our manufacturing centres of competence combine extensive experience and application knowledge with leading technology and continued R&D.
How our manufacturing benefits your gold plant:
Our leading design and manufacturing tools include:
Multotec’s extensive equipment range and manufacturing capabilities are supplemented with our top-quality technical solutions and the highest levels of support. From assistance in selection of appropriate equipment through to delivery accuracy, we provide leading technical support.
With many years in the gold recovery industry and highly qualified and technically proficient personnel, we offer high levels of application knowledge and technical expertise.
Our highly skilled and qualified engineers, all considered experts in their relevant fields, are responsible for conducting precise process audits to implement customised and application-specific solutions.
Our technical capabilities include:
How our technical capabilities benefit your plant:
We will partner with you throughout the lifecycle of your plant, offering solutions that reduce wear and tear, and which are designed and refined in response to real field ore processing challenges to constantly improve your gold recovery processes.
Committed to the optimisation of your plant, we supply a team of skilled engineers and metallurgists, as well as an established, strategically located distribution network.
With high levels of aftersales service and support, including full maintenance contracts on equipment, Multotec is your dedicated ore processing partner.
After the gold ore has been removed from the earth using mining equipment, it is sent to a gold processing plant.
The typical gold processing plant begins with a cone crusher, to reduce the particle size of the ore. Next, it is loaded on a conveyor belt, where an overbelt magnet removes tramp metal from the gold mining process.
The ore goes for preliminary screening, followed by stream sampling, which is a process that uses a hammer sampler.
A semi-autogenous mill (SAG) or ball mill is then used to grind and crush the gold ore to a smaller particle size. After this milling, the stream is fed to a trommel screen and next, a cyclone circuit.
Cyclones, which are set at the appropriate cut point, separate correctly sized particles from larger ore particles. Oversized particles are returned to the grinding mills for further crushing/grinding. Correctly sized particles are sent to a thickening dam for leaching, where a flocculent is added.
Prior to the addition of the cyanide-based medium for the leaching process, slurry undergoes sampling. Cyanide is used to dissolve the gold from the ore. When carbon is added in either a CIP or CIL process, the gold adheres to the carbon. The carbon is then removed via loaded and regenerated carbon screens.
Within the CIP/CIL process, Kambalda screens and Interstage screens are used. These gold flotation screens are then used to isolate any gold particles, according to particle size, and are placed prior to gold flotation and in the elution outflow.
Lastly, cyclones are used in the discharge of tailings within the slime dam.
Find out more about our gold extraction plants here.
What is a gold processing plant?
Mined gold-bearing ore containing gold and silver is extracted and purified through a processing plant. In this gold recovery plant, the precious metals are extracted from the ore through a series of steps including: crushing and grinding; addition of process water (forming a slurry); cyanide leaching; floatation and vortex separation (cyclones).
How is gold processed?
Gold bearing ore can be processed in one of two methods, one being the Miller process and the other, the Wohlwill process. The Miller process uses a stream of pure chlorine gas, that is placed over and through a crucible filled with molten, impure, gold. The Wohwill processes uses electrolysis, mixing impure gold with an electrolyte solution, hydrochloric acid and gold chloride. The former process increases purity to about 99.95%, while the latter offers 99.99%.
How do you extract gold from soil?
Gold can be extracted from soil in various ways, from manually panning, crushing and grinding, to separating using spiral concentrators and cyclones. There are many steps for extracting gold from soil, and these processes are dependent on the mineral processing plant and the methodology used.
What chemicals are used to extract gold?
Sodium cyanide solution is generally used for gold leaching, but there are various chemicals used when extracting gold, including hydrochloric acid and chlorine gas.
How do you mine gold without cyanide?
When processing gold, cyanide can be substituted with a safer alternative reagent called thiosulphate. Using thiosulphate, fine gold is dissolved out of the impure ore at a similar rate to when using cyanide. Using thiosulphate is safer and it lowers the environmental impacts of gold extraction.
How long does it take for gold to grow?
Gold doesn’t technically grow in the Earth’s surface. It became present on Earth when meteorites packed with gold and other metals collided with the planet.
What is gold milling?
Gold milling, which is also known as fine grinding, pulverising or comminution, is a grinding process that reduces materials into a powder or finer sized particles. Milling is used to recover the maximum amount of gold from the ore by finely grinding it so that gold particles can be removed through gravity separation and/or chemical extraction.
What is the difference between CIP and CIL gold processing?
Carbon-in-pulp (CIP) consists of cyanide leaching and then absorption of gold from ore, which is considered a simple and cheap process. Using a CIP gold processing plant, pulp flows through tanks where sodium cyanide and oxygen help dissolve gold into solution. CIP plants are similar to Carbon-in-leach plants.
Carbon-in-leach (CIL) is a process of cyanidation similar to that of CIP. The difference is that in a CIL plant, carbon is added to the leach tanks so that leaching and adsorption take place in the same tanks.
What is a gold elute solution?
The gold elute solution (gold elution), usually consists of caustic soda (the electrolyte), cyanide and water. This solution circulates through the loaded carbon to extract gold and other metals. Then the solution passes back through the loaded carbon, extracting more gold and other metals. The extraction process continues until the carbon has been completely stripped.