Proceso de beneficio de oro en vetas de cuarzo

Introduction to Quartz Vein Gold Deposits

Quartz vein gold deposits are among the most significant gold resources globally, particularly in China, where they account for over 50% of gold deposits and reserves. These deposits are characterized by simple mineralogy, primarily consisting of quartz gangue (>60%) and native gold or electrum (gold-silver alloy).

Key Features

1. Gangue Composition:
   • Dominated by quartz (SiO₂), typically exceeding 60% of the vein material.
   • Minor constituents may include carbonates (calcite, dolomite) y sulfides (pyrite, arsenopyrite).
2. Gold Mineralization:
   • Native gold (free gold) is the most common form.
   • Electrum (Au-Ag alloy) occurs frequently, with silver content varying widely.
   • Gold grain size ranges from medium to fine, affecting extraction methods.
3. Ore Texture & Structure:
   • Vein-type deposits: Gold occurs within fractures or fissures filled with quartz.
   • Disseminated mineralization: Fine gold particles may be embedded in quartz or sulfides.

Quartz Vein Gold Beneficiation Methods

Quartz vein gold ore beneficiation methods mainly include gravity separation, amalgamation, flotation, cyanidation, and combination processes like gravity separation – flotation, gravity separation – cyanide, and flotation – cyanide.

Among them, the amalgamation method has been basically abandoned due to its environmental hazard.

El método de cianuración de lodo completo tiene una alta tasa de recuperación, pero el oro grueso prolongará el tiempo de cianuración, aumentará la cantidad de reactivo de cianuro y reducirá la eficiencia de la producción. Además, debido al peligro de los productos químicos cianurados, su desarrollo es limitado.

The single flotation process is simple, but the gold in the ore cannot be completely recovered. The coarse gold in the flotation tailings is lost. Therefore, the effective recovery of granular gold by gravity separation before flotation and cyanidation is of great significance to the efficient utilization of gold resources. The Knelson concentrator can effectively separate gold minerals and gangues, has a high enrichment ratio, environmental friendliness, and low production cost. It has been widely used in China’s quartz vein-type gold ore beneficiation process.

Concentrador Knelson

The Knelson concentrator is an enhanced equipo de separación por gravedad based on the centrifugal principle. The enrichment cone produces a high-magnitude gravitational field at high speeds, and the difference in gravity between minerals of different densities is multiplied, making the separation between light and heavy minerals easier.

¿Cuál es la mejor sustituto del concentrador Knelson?

Basado en el equipo concentrador centrífugo tradicional, el concentrador Knelson ha resuelto con éxito el problema del empaquetamiento apretado de las capas de mineral y la baja eficiencia de clasificación. La relación de beneficio del oro es de hasta 1 000 - 5 000. 

The Knelson concentrator has the following advantages:
(1) Chemical-free, environmentally friendly.
(2) Buen efecto de separación, alta relación de beneficio, alta ley de oro.
(3) Automation and stability.
(4) High processing capacity and high production efficiency.

Knelson Concentrator Flotation Beneficiation Process

Los resultados experimentales muestran que cuando la finura de molienda es de -0,074 mm, 84%, la tasa de recuperación del proceso combinado de separación por gravedad - flotación es de 91,40%, que es 3,09% superior a la del proceso de flotación simple.

The Knelson gold concentrator has great advantages in the gravity separation of quartz vein type gold ore and has been applied to the beneficiation process by more and more gold plants. Among them, the most widely used is the Knelson concentrator flotation beneficiation process. The use of a Knelson concentrator to recover the natural gold in the gold mine in advance effectively avoids the loss of coarse gold in the flotation tailings and increases the concentrate grade.

The process is environmentally friendly, has high recovery efficiency and good adaptability, and is suitable for most quartz vein-type gold mines.