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The subject of this study is a novel process: the Dry Process (DP) for the concentration of boron ores. The conditions of the concentration of boron ores by the dry process were determined in laboratory and pilot-scale tests. In addition to this, the necessary requirements to apply this process in the plant were investigated. In this process, three types of boron ore were used and they were compared at each step. Before the start of the tests, for determination properties of representative samples of feeds taken from the concentrators (tincal, colemanite and ulexite), particle sizes and the B2O3 % distributions of feeds were investigated, and the B2O3 grade of the samples was 23-32 % as the grades in the plants. In tests conducted in optimum conditions, concentrates with 43-60 % B2O3, tailings with 3-22 % B2O3 and 70-96 % recoveries were obtained. In the currently operated plant, the concentrate grade is 32-38 % B2O3, recovery is 80 %, and the tailing grade is 14-16 % B2O3. The investigations showed that boron ores might be calcined. It was understood that higher quality and dry, cleaner products might be obtained. |
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