This project entails the complete process flow for a 50 TPH alluvial diamond processing plant in Angola. It uses a combined processing route featuring vibrating feeder pre-screening, trommel scrubbing and classification, high-frequency fine screening, and gravity separation via jigs. The system incorporates a dual-jig separation process that treats different-size fractions separately, leveraging the jigs’ high efficiency in separating heavy minerals from light gangue to maximize diamond recovery. Designed to handle alluvial diamond deposits characterized by high clay content and a wide particle size distribution, this solution is both economical and reliable; it utilizes an environmentally friendly and purely physical beneficiation process. The full alluvial diamond processing equipment layout is compact, facilitating daily operation and maintenance, and is well-suited to local mining conditions in Angola.
50TPH Alluvial Diamond Processing Plant
Diamond-bearing alluvial run-of-mine (ROM) ore is loaded into the feed hopper by loaders or dump trucks. A vibrating grizzly feeder at the hopper’s base performs pre-screening, separating material at a 75mm threshold. Oversized material (+75mm)—comprising large cobbles and waste rock—is rejected and discharged via conveyor for stockpiling. Water sprays are applied to the feeder to ensure the 0–75mm fraction flows smoothly into the subsequent processing stage.
Material sized at -75 mm enters the rotary drum washer-screen. As the drum rotates, intense friction and scrubbing actions occur between the material particles themselves and between the material and the drum wall, effectively stripping away the clay and mud adhering to the diamond surfaces. Simultaneously, the screen performs a classification based on two aperture sizes—30 mm and 2 mm: +30 mm coarse waste rock is discharged via conveyor belt, -2 mm fine slurry is sent directly to a settling pond, and the 2–30 mm ore-bearing material is fed into a high-frequency screen for finer screening.
Upon entering the high-frequency vibrating screen, material ranging from 2 to 30 mm is precisely separated into three size fractions through high-frequency, low-amplitude screening: the -2 mm fine underflow is sent to a settling tank to combine and settle with the fine sludge discharged from the drum ore washer; the 18–30 mm medium-sized waste rock is discharged via conveyor belt for stockpiling; and the two ore-bearing fractions—2–8 mm and 8–18 mm—are separately fed into two jigs for independent beneficiation. This fine classification establishes optimal feed size conditions for subsequent gravity separation.
The 2–8 mm and 8–18 mm size fractions are fed into two separate jigging machines. These machines utilize pulsating water flow to cause the material on the screen plate to repeatedly loosen and compact. Diamond particles gradually settle to the bottom layer and pass through the screen to form the concentrate, while lower-density gangue minerals are discharged with the upper water flow as tailings.
Three fractions of waste rock are generated during the process—coarse (+75 mm), medium (30 mm), and fine (18–30 mm)—which are discharged via separate belt conveyors and stockpiled according to size. The -2 mm fine sludge discharged from the drum scrubber and the -2 mm underflow from the high-frequency screen are collected in a settling pond for natural sedimentation. The supernatant can be pumped back for use as make-up water in the scrubbing and jigging operations, thereby enabling the recycling of process water.
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