Proses Benefisiasi Emas Urat Kuarsa

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) dan 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.

Metode sianidasi lumpur penuh memiliki tingkat pemulihan yang tinggi, tetapi emas kasar akan memperpanjang waktu sianida, meningkatkan jumlah reagen sianida, dan mengurangi efisiensi produksi. Selain itu, karena bahaya bahan kimia sianida, pengembangannya menjadi terbatas.

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.

Konsentrator Knelson

The Knelson concentrator is an enhanced peralatan pemisahan gravitasi 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.

Apa yang terbaik pengganti konsentrator Knelson?

Berdasarkan peralatan konsentrator sentrifugal tradisional, konsentrator Knelson telah berhasil memecahkan masalah pengemasan lapisan bijih yang ketat dan efisiensi penyortiran yang rendah. Rasio manfaat emas mencapai 1.000 - 5.000. 

The Knelson concentrator has the following advantages:
(1) Chemical-free, environmentally friendly.
(2) Efek pemisahan yang baik, rasio manfaat tinggi, kadar emas tinggi.
(3) Automation and stability.
(4) High processing capacity and high production efficiency.

Knelson Concentrator Flotation Beneficiation Process

Hasil eksperimen menunjukkan bahwa ketika kehalusan penggilingan adalah -0.074 mm, 84%, tingkat pemulihan proses kombinasi pemisahan gravitasi - flotasi adalah 91.40%, yang lebih tinggi 3.09% daripada proses flotasi tunggal.

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.