Adoption of autogenous or semiautogenous grinding AG/SAG would lead to a significant simplification alternative to such plants. Within the scope of AG/SAG grinding, several approaches can be used in size reduction. For instance, the mill may be operated in the absence of steel grinding media AG or with steel balls SAG Gupta and Yan, 2016.
Rely on our proven track record of SAG and AG Mill superiority. Since the early 1980s, we have been designing and manufacturing SemiAutogenous SAG and Autogenous AG Grinding Mills under the FullerTraylor brand. Semiautogenous grinding uses a minimal ball charge in the range of 615 while autogenous grinding uses ore only.
Autogenous AG and SemiAutogenous SAG milling has seen increased use in recent years, especially in large mineral processing operations. These mills typically have a large diameter relative to their length, typically in the ratio or 2 or 2.5 to 1. AG mills employ ore as the grinding media. However, one the challenges with AG mills is that
Haines C and Bertoldi D. The transition from semiautogenous to autogenous milling at Waihi Gold, in 13th AusIMM Mill Operators Conference, Perth WA, 1012 October 2016, pp 303312 The Australasian Institute of Mining and Metallurgy. CEEC would like to thank to The AusIMM for permission to reproduce this abstract.
In a semiautogenous grinding SAG mill, 50Jo to 10 of the mill volume may be occupied by grinding balls, whereas a range of 25 to 45 is more usual in ball milling.The comminution of mineral ores using ""conventional"" techniques has been described in previous papers.
Pilot plant testing for primary autogenous or semiautogenous grinding gives the following information needed for selection of mills, circuit design, and mill design. 1, 2 and 3. Since the ore determines the nature of the product from an autogenous or semiautogenous grinding circuit, the first thing to be determined is the suitability of
semi autogenous grinding . Semiautogenous grinding pebbles were used as a grinding mediumpared to steel balls in terms of their effect the flotation behavior of the products and their industrial application. The pebbles increased the rate of copper recovery from the concentrated products by 3.30 to 86.89. More
Semiautogenous grinding is applied when fine crushing could cause severe problems or when ore is variable in hardnesspetency. Figure 2 shows a typical conventional crushinggrinding circuit with three stages of crushing followed by ball mills or rod millballbination.
Autogenous and SemiAutogenous Mills The optimum solution for wet grinding Higher quality at a lower cost Open the catalog to page 1 Xinhais AG/SAG millsplish the same size reduction work as 2 or 3 stages of crushing and screening The feed size for these mills is limited to the maximum size that can be practically conveyed and
Concentrators vary similarly. A new large concentrator unit typically consists of a semiautogenous grinding mill, high pressure grinding rolls, two ball mills, and a flotation circuit. It can treat up to 170 000 tonnes of ore per day Sartain, 2010. Larger concentrators consist of multiples of this basic concentrating unit.