RESEARCH OF THE COMPLEX STAGE-BY-STAGE SCHEME OF GRAVITY SEPARATION OF GOLD ORE
Surimbayev B. Bolotova L. Shalgymbayev S. Razhan E.
2021National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2021#5Issue 449124 - 136 pp.
To extract large free gold, gravity separation is used, which is the most common method for processing mineral raw materials. The object of research is the gold-bearing ore of one of the deposits of Kazakhstan in the Almaty region. According to the results of assay and gravimetric analysis, the average gold content in the ore is 11.84 g/t, silver-6.10 g/t. According to the content of sulfide sulfur (1.18%), the ore sample is assigned to the low-sulfide type of ore, according to the oxidation state of sulfur (1.67%)-to the primary type of ore. The results of assay, chemical and mineralogical analyzes of the ore have shown that the main industrially valuable component in the ore is gold. Basically, gold is in the form of free grains, and has different shapes and sizes of gold grains. Laboratory studies on gravity separation of ore have been carried out. The influence of the size of the ore and the use of various devices-the concentration table and the Knelson concentrator-have been studied. The highest enrichment rates were obtained at the Knelson concentrator when enriching regrind ore with a size of 80% of-0.071 mm: in one stage, the gold recovery into the gravity concentrate was 73.06%; the gold content in the concentrate is 379.2 g/t; the concentrate yield is 3.23% of the ore mass. Tests were carried out for stage-by-stage gravity separation of ore, including gravity concentration at the first stage, the gold ore crushed to 100% passing-1.0 mm and processed at the concentration table; at the second stage, the tailings of the first stage and tailings of the first re-separation were regrind to 60% passing-0,071 mm and processed at the concentration table; at the third stage, the tailings of the second stage and tailings of the second re-separation were regrind to 90% passing-0,071 mm and processed at the Falcon centrifugal concentrator; and at the fourth stage-gravity control on the concentration table and Knelson centrifugal concentrator. The use of a complex stage-by-stage scheme of gravity separation of ore made it possible to increase the gold recovery in concentrate and enriched products to 83.30-86.11% with a yield of 5.088-5.368% with an average gold content of 251.53-274.27 g/t. Gravity tailings contain 2.86-2.37 g/t gold.
Centrifugal concentrator , Concentration table , Gold , Gold ore , Gravity separation
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Kazmekhanobr State Scientific Production Association of Industrial Ecology, Almaty, Kazakhstan
Al-Farabi Kazakh National University, Almaty, Kazakhstan
Kazmekhanobr State Scientific Production Association of Industrial Ecology
Al-Farabi Kazakh National University
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