A method and equipment for rapid separation of silicon-calcium slag

Abstract

The invention discloses a method and equipment for quick separation of silicon-calcium slag, including a high-pressure chamber, a filter device and a discharge system, wherein the high-pressure chamber is a high-pressure closed system, and the filter device is arranged in the system, mainly including a slurry storage tank And the rotating mechanism, wherein there are a plurality of annular filter discs arranged in series on the rotating mechanism, which is composed of a plurality of fan-shaped filter plates arranged concentrically. In addition, the rotating mechanism and the fan-shaped filter plates are both hollow, and their interiors are connected to each other. The slurry tank is arranged below the rotating mechanism; the unloading system includes a reverse blow pipe and a blanking tank, wherein the blanking tank is connected with a circular filter disc, and the reverse blow pipe is connected with the gas filling pipe of the high-pressure chamber, and passes through the distribution head It is connected to the position of the annular filter disc above the falling chute. The invention can make the water content of the calcium-silicon slag after separation reach 15%, and the content of floating matter in the filtrate is less than 5g / L, thereby greatly increasing the effect of solid-liquid separation.

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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