Patent GB-258753-A (GB)
Title: Improvements in or relating to washing coal, ores, and other similar material
IPC: B03B5/68
Filed: 1925-11-28
Abstract: 258,753. Hoyois, L. Nov. 28, 1925. No Patent granted (Sealing fee not paid). Inclined trough wetseparating apparatus; up. ward-current classifiers. -In washing coal, ore, &c., the material is first divided by an adjustable diverting partition below a weir in a trough into light and heavy portions; the light portion is further graded in a trough by allowing the denser parts to pass through into a second trough; while the heavier portion from the first separation is treated in an upward-current classifier, the lighter parts of this portion being passed into the second trough which receives the denser parts of the lighter portion. The material passes in a current of water down an inclined trough A1, Fig. 1, into a horizontal trough A2. An opening O extends across the trough A2, above which are located two inclined partitions a, b, the partition a being fixed, while the partition b is movable so as to regulate the opening. The material flowing with the water over the upper edge of the partition a is divided into two parts, the heavier falling through the opening while the lighter portion flows on to a partition e in a trough A3. This partition is provided with adjustable openings 01, 00, so that the heavier material falls into the trough A3. The latter is provided with adjustable openings 02, 03, 04 through which the heavier material falls into a hopper P. The lighter material, together with that from the partition e falls at the end of the trough into a hopper Q. The heavier material from the first separation is treated in an upward-current classifier B, which consists of a duct B2 leading to a vertical duct B1 which it joins at an angle of 30‹. At the junction a. pipe T1 supplies a first watering current, and a pipe T2 entering the duct B1 lower down supplies a second water current which is adjusted so that the vertical column is kept full and a discharge of predetermined value takes place at the bottom of the column. The top of the duct B1 opens into the trough A3 at 01, where the lighter parts of the material treated by the upward-current classifier are delivered to the trough A3. The material is thus separated into three parts. In the case of coal, shale is discharged from the lower end of the duct B1; pure coal is received in the hopper Q and mixed products in the hopper P. A modified arrangement is shown in Fig. 2, in which the products brought to the top of the duct B1 and those falling through the openings 05 and 06 are formed into a washing bed in a trough A2<1>. The material in this trough is divided by means of a partition b<1>, the denser portion being treated in an upward-current classifier B<1>, and the lighter portion being carried over a partition e<1>, through which the denser particles fall while the lighter particles pass on into the hopper Q. Intermediate products are received in the hopper P. Three or more installations may be arranged in series in the same way. For material containing large particles. the nozzle at the bottom of the duct B1 may be replaced by a bucket elevator enclosed in a watertight casing or equivalent apparatus in order to reduce the water consumption.