Please select the most similar patent number from A, B, C and D. Which number is?
A method of selectively separating a coal slurry with poor floatation employing nanobubbles comprises: mixing water (2) and an appropriate amount of a foaming agent (1) evenly and providing the same to a Venturi tube (C) via a pump (B), injecting, via the Venturi tube (C), a flow, to generate a large amount of air bubbles including large bubbles and nanobubbles; providing, to a bubble elimination tub (D), a bubble containing solution (4), wherein while the larger bubbles having greater buoyancy ascend to a surface of the solution and then burst, the nanobubbles having less buoyancy are blended into the solution and move with a water flow; providing, to a normal mixing tub (F), a nanobubble-containing solution (5), coal slurry (7), and an appropriate amount of a floatation solvent (8) to mix the same, and selectively separating, by a floatation column (H), the mixed coal slurry (9), to produce refined coal (10) and tailings (11).
A: Disclosed is a dual-fluid colliding jet-type micro-nano-bubble generation device, comprising Venturi tubes, wherein two Venturi tubes are provided. The device has the beneficial effects that the device uses a dual-fluid colliding-type structural design; collision occurs between two fluids containing micro-nano-bubbles, and thus a turbulence intensity being 1.5-3 times higher than that of traditional single-tube jets is formed to promote micro-nano secondary crushing, such that there are more micro-nano-bubbles generated, and the grain size becomes uniform; by means of collision between two foam fluids, a diffusion mode of the micro-nano-bubbles changes to a 360-degree annular disk form, thereby facilitating diffusion of the micro-nano-bubbles; a counter-acting force of a water body on the device is small due to a special collision-type structural design; therefore, when the device works underwater, other fixing devices are not needed, thereby greatly improving convenience; and compared with a traditional single-tube Venturi tube device, the present invention requires lower energy consumption in the case of requiring the generation of the same number of micro-nano-bubbles of the same grain size.
B: A preparation method using micro-nano bubbles as crystal seeds to induce spherical or spherical-type silver powder production, said method specifically comprising the steps of: pre-adding a prepared dispersing agent solution to a reaction vessel, starting a micro-nano bubble generator, producing controllable micro-nano bubbles (0.1nm-900nm) in the dispersing agent solution within the reaction vessel, simultaneously adding a prepared oxidising solution (an aqueous solution containing silver ions or a silver ammonia solution) and a reducing solution (an aqueous solution containing one or a plurality of hydroxylamine compounds, vitamin C, formaldehyde or hydrazine hydrate), performing a reduction reaction under vigorous stirring, and using the pre-generated micro-nano bubbles within the dispersing agent solution as crystal seeds, the micro-nano bubble crystal seeds effectively controlling the particle size of reduced silver particles throughout the reduction reaction. The method effectively controls the particle size of the silver powder during production, and also controls the crystal nucleus growth rate and dispersibility. The produced silver powder has excellent crystallinity and sphericity, high tap and high dispersibility, and in particular, the silver powder particle internal loose structure significantly aids the activity of the silver powder.
C: A high-ash fine coal slime separation device and method. The device comprises a columnar structure. A top end of the columnar structure is internally provided with a foam water spray device (1). The bottom of a clean coal overflow tank (2) is provided with a clean coal discharge port (B). A feed pipe (5) is axially arranged at the circle center of the columnar structure and the feed pipe (5) is provided with a material inlet device. Two groups of filling devices (3) are respectively arranged on the feed pipe (5) in series, and the filling devices (3) are closely arranged cylindrical structures. The cylindrical structures are vertically through. Internal adhesion walls are provided with an internal spray water washing device (6) matching a flotation column body (4). A middlings discharge device (7) is arranged below the flotation column body (4). A scavenging segment (8) is provided at the bottom of the middlings discharge device (7). An external outlet (E) is sequentially connected to a circulating pump (10) and a micro-bubble generator (9) via a pipeline. A plurality of hydrocyclones (12) are respectively provided above a side wall of the clean coal overflow tank (2). Each of the hydrocyclones (12) is provided with a material inlet connector, and the material inlet connector is connected to a middlings discharge port (C). The high-ash fine coal slime separation device and method can both effectively improve the recovery rate and clean coal quality of a flotation product of high-ash difficult-to-separate coal slime and reduce the loss of coarse particles in coal particles.
D: A preparation method using micro-nano bubbles as crystal seeds to induce spherical or spherical-type silver powder production, said method specifically comprising the steps of: pre-adding a prepared dispersing agent solution to a reaction vessel, starting a micro-nano bubble generator, producing controllable micro-nano bubbles (0.1nm-900nm) in the dispersing agent solution within the reaction vessel, simultaneously adding a prepared oxidising solution (an aqueous solution containing silver ions or a silver ammonia solution) and a reducing solution (an aqueous solution containing one or a plurality of hydroxylamine compounds, vitamin C, formaldehyde or hydrazine hydrate), performing a reduction reaction under vigorous stirring, and using the pre-generated micro-nano bubbles within the dispersing agent solution as crystal seeds, the micro-nano bubble crystal seeds effectively controlling the particle size of reduced silver particles throughout the reduction reaction. The method effectively controls the particle size of the silver powder during production, and also controls the crystal nucleus growth rate and dispersibility. The produced silver powder has excellent crystallinity and sphericity, high tap and high dispersibility, and in particular, the silver powder particle internal loose structure significantly aids the activity of the silver powder.
Answer: C