Method and device for quickly separating silicon-calcium slag

Abstract

The invention discloses a method and a device for quickly separating silicon-calcium slag. The device comprises a high-pressure storehouse, a filter and a discharging system, wherein the high-pressure storehouse is a high-pressure sealed system, the filter is arranged in the system and mainly comprises a pulp storing groove and a rotating mechanism, a plurality of ring-shaped filtering discs are arranged on the rotating mechanism in series, the rotating mechanism is formed by concentrically arranging a plurality of fan-shaped filtering plates, the rotating mechanism and the fan-shaped filtering plates are hollow and are internally communicated with one another, and the pulp storing groove is arranged under the rotating mechanism; the discharging system comprises a backward blowpipe and a material falling groove, wherein the material falling groove is connected with the material falling groove, the material falling groove is connected with an air-entrapping pipe of the high-pressure storehouse and is communicated with the place where the ring-shaped filtering discs are placed above the material falling groove through a distribution head. After the method and the device are adopted, the water content of the separated silicon-calcium slag reaches 15%, and the suspended matter content in the filter liquor is less than 5g / L, so that the solid-liquid separation effect can be greatly improved.

Description

technical field [0001] The invention relates to the comprehensive utilization technology of fly ash, in particular to a method and equipment for rapid separation of silicon-calcium slag in the process of extracting alumina from fly ash. Background technique [0002] Fly ash is the main industrial solid waste of coal-fired power plants. Due to the special geological ore-forming background, aluminum-containing minerals and coal seams are deposited simultaneously to form high-aluminum coal resources in the central and western regions of Inner Mongolia and northern Shanxi. The alumina content in the fly ash is more than 40%, which is a high-quality bauxite substitute resource. [0003] At present, the annual emission of high-alumina fly ash in my country is about 25 million tons, of which about 11.8 million tons are in the central and western regions of Inner Mongolia, accounting for more than 47% of my country's high-alumina coal resources. Making full use of high-alumina fly ...

AI Technical Summary

Problems solved by technology

Vacuum filtration method is used to filter the silicon-calcium slag with a large amount of liquid attached, more than 30%; the separation and settling tank is based on the principle of gravity separation to achieve solid-liquid separation. When the solid phase particle size is fine, or the specific gravity between solid and liquid When it is small, the sedimentation speed of calcium silicate slag will be very slow, and it is difficult to achieve effective solid-liquid separation. In addition, if the solid-liquid separation time is too long, it will lead to a series of problems such as high secondary reaction of alumina and low alumina dissolution rate of calcium silicate slag.

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