Abstract: The use of vibrating sieve bend for dewatering and disliming operatin in coarse slime treatment process can hardly achieve the expected result. Moreover, its overflow is high in ash while the underflow contains oversize particles. To tackle this problem, a technical scheme of using the intelligent 3-mass high-frequency fine screen in place of the bibrating sieve bend is proposed. Practice of the application of the screen in a multiple coarse slime treatment processes demontstrates that the moisture of the screen overflow can meet the optimal feed concentration required by centrifuge; the ash of screen overflow is up to the required standard and the screen underflow no longer contains oversize particles, which constitutes an optimal size feed for flotation system; and the ash and moisture of screen overflow and the size of the underflow can be brought under accurate control.