A kind of coal slime water flotation device and technology

Abstract

The invention discloses a slime water flotation device and technology. The slime water flotation device comprises a chemical pre-vaporization device, a chemical and air mixing device, a slime water pre-classifying device and flotation equipment. A vaporization chemical of the chemical pre-vaporization device is output to the chemical and air mixing device, the output end of the chemical and air mixing device communicates with the slime water pre-classifying device, and after being subjected to classifying flotation, the vaporization chemical flows into the flotation equipment. The flotation technology comprises the steps that firstly, the chemical is subjected to pre-vaporization and mixing, wherein a collecting agent and a foaming agent in a flotation chemical are subjected to pre-vaporization, and then the vaporization chemical and air are sufficiently mixed to form mixed gas; and secondly, slime water is subjected to pre-classifying and flotation, wherein the mixed gas is led into the slime water pre-classifying device to be subjected to classifying flotation. The slime water flotation device is simple in structure and stable in running, the contact area of the chemical and slime water is sufficiently increased, the slime water pretreatment effect is effectively improved, and the slime water classifying effect can be improved.

Description

technical field [0001] The invention belongs to the technical field of coal slime water flotation, and in particular relates to a coal slime water flotation device and a process. Background technique [0002] Coal slime water is the medium water produced in the process of coal separation and processing. Coal slime water is one of the main sources of pollution in the coal industry. The main task and purpose of the coal slime water treatment system is to recover fine particles of different qualities from a large amount of coal slime water The product and the recycling water suitable for the coal preparation plant can realize the closed loop washing water, and whether the discharge can meet the requirements of environmental protection will seriously affect the economic and social benefits of the coal preparation plant. Therefore, slime water treatment is a very important link in the production process of coal preparation plants. [0003] At present, in the flotation process, c...

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Problems solved by technology

[0003] At present, in the flotation process, collectors for improving the hydrophobicity of the coal particle surface and foaming agents for reducing the gas-liquid interfacial tension are mostly used for reagent addition; Chinese patent document CN 103736599A discloses an emulsification device, which includes a mixing pump, A water source, a water inlet regulator, an air inlet regulator and an emulsifier. The emulsifier consists of a shell whose internal space is divided into a front chamber and a rear chamber by a partition with a narrow hole. Air and water are mixed. When the body passes through the narrow hole, it forms an emulsified state due to cavitation. Due to the emulsification, the agent is highly dispersed to form a misty aerosol, which increases the stability of the flotation agent emulsion and prevents it from forming large oil droplets, thereby improving the chemical and pulp. The contact area increases the flotationability of minerals and improves the flotation yield. The application of this device in flotation will greatly improve the effect of pulp pretreatment, but the device is easy to block the slit and affect the emulsification effect, and the device needs Adjust and control the air and water to form high-pressure saturated gas-liquid, which cannot achieve stable operation effect

Moreover, in the prior art, the flotation of coal slime water must first be classified, and the classification is to separate the solid particles according to the particle size. The commonly used classification equipment is a hydrocyclone, and the classification efficiency of the hydrocyclone varies with the particle size. It is used to divide the solid phase particles in the feed into coarse-grained particles and fine-grained particles. Since the processing capacity of the cyclone decreases with the decrease of the diameter, in actual production, more The installation of two hydrocyclones in parallel meets the production requirements, but this will inevitably increase the time consumption of flotation, increase the energy consumption of equipment, and reduce the flotation efficiency.

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