Purifying treatment method and system for cuttings-carrying slurry of bentonite

Abstract

The invention provides a purifying treatment method for cuttings-carrying slurry of bentonite. The purifying treatment method for the cuttings-carrying slurry of the bentonite comprises the steps thatmud-water separating treatment is conducted, specifically, a multistage sieving device is used for conducting separating treatment on the input cuttings-carrying slurry, sandstone which does not conform to a slurry system is sorted out, then the slurry is subjected to concentrating and dewatering, and concentrated slurry and a mud-containing water body are obtained; and purifying and recovery ofthe mud-containing water body are conducted and comprise the steps of flocculation filter pressing and flocculation sedimentation, specifically, according to the flocculation filter pressing step, first the mud-containing water body is adjusted to a predetermined solid content, a flocculant is added, then a mixture enters a filter press for filter pressing, a mud cake and filter water are obtained, and according to the flocculation sedimentation step, the filter water generated in the flocculation filter pressing step is sent into a sedimentation tank and is subjected to sedimentation and layering in the sedimentation tank, and the upper layer of clear water is sent into a clear water tank for storage. According to the purifying treatment method for the cuttings-carrying slurry of the bentonite, the cuttings-carrying slurry can be subjected to full purifying treatment, zero discharge of water is realized, and a large amount of bentonite and the cost for dumping the waste slurry are saved.

Description

technical field

[0001] The invention relates to a purification treatment technology for drilling mud in civil engineering, in particular to a purification treatment method and system for bentonite-carrying rock mud. Background technique

[0002] Bentonite is a non-metallic mineral with montmorillonite as the main mineral component. The structure of montmorillonite is a 2:1 crystal structure composed of two silicon-oxygen tetrahedra sandwiching a layer of aluminum-oxygen octahedron. Among them, because bentonite has many properties, such as swelling, adsorption, thixotropy, etc., it has been widely used in more than 300 fields abroad, and it is called "universal soil". One of the typical applications is to make bentonite construction mud, that is, when it is filled with a mixture of water, bentonite and CMC and other admixtures, for projects such as underground diaphragm wall formation, bored pile drilling, etc., the mud will not affect the groove wall The static pressure an...

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