A kind of primary slag recycling method

Abstract

The invention discloses a method for recycling primary slag. The primary slag is derived from but not limited to mine tailings, subway tunnels, and excavated from building foundation construction. The main components of the primary slag include stones , gravel, sandy mud, semi-weathered matter and soil, the method includes the following steps: step 1, the original dregs are processed into stones through wet screening, and the sand and gravel enter the crushing equipment; sand, gravel, semi-weathered matter and sandy mud Enter the desliming equipment; the mud mixture enters the solid-liquid separation; step 2, the sand, semi-weathered matter and sand mud are treated by the desliming equipment, and the semi-weathered matter is completely pulverized and the sand and mud are completely separated; step 3, the sand fine treatment; step 4, the liquid obtained from solid-liquid separation is treated by water treatment equipment and then water is recycled. The separated construction sand can be recycled in the construction industry, and the separated ceramic soil can be made into fired bricks, so that the original dregs can be truly recycled and comprehensively utilized.

Description

technical field [0001] The invention relates to the technical field of mines and urban environmental protection, in particular to a method for recycling primary slag. Background technique [0002] With the continuous acceleration of urban construction, a large amount of excavated primary dregs will inevitably be produced in the construction of large-scale municipal facilities such as urban renewal and rail transit. Since the primary dregs have not reached the standard for direct use, at present, the treatment of these primary muck The best way is to landfill. On the one hand, a large amount of original muck has not been effectively recycled, and on the other hand, the planned muck receiving sites have been quickly filled, and the contradiction between supply and demand is increasing, which makes the city face a severe muck discharge crisis. [0003] The publication number is "CN107234126A", and the Chinese invention patent titled "method for pollution-free treatment and rec...

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Problems solved by technology

[0004] Primary slag mainly includes stones, gravel, sandy mud, semi-weathered matter and soil. The pump washing method disclosed above can only separate part of the sand and mud, while the mud and semi-weathered matter attached to the surface of the sand grains cannot be removed. The obtained slag contains silt-containing sand and gravel and a large amount of semi-weathered matter, and the silt content must not meet the requirements of "Quality Standards and Inspection Methods for Sand for Ordinary Concrete" JGJ52-2011, so the recycling and comprehensive utilization of the slag cannot be truly realized. , in the above-mentioned disclosed method, the solid-liquid separation by dehydration and pressure filtration cannot be realized, because when the particle size of more than 50% of the materials in the mud is greater than 500 mesh, the solid-liquid separation cannot be directly performed by pressure filtration, and chemical agents such as After the flocculant is treated, the filter press equipment can be used for solid-liquid separation, which not only has high economic costs, but also causes serious chemical pollution to water and mud

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