A new type of waste mud mud-water separation material with high solid phase content and its preparation method

Abstract

The invention discloses a novel mud-water separation material for high-solid-content waste slurry and a preparation method of the novel mud-water separation material. The novel mud-water separation material is prepared from, by weight, 40-60 parts of polyacrylamide, 20-30 parts of modified starch and 20-30 parts of inorganic flocculant by compounding. By the novel mud-water separation material, synchronous quick flocculation of more than 90% of solid-phase particles (larger than 200-mesh in particle size) in waste slurry can be completed in 5min, and the novel mud-water separation material has advantages of high flocculation speed, high particle separation rate, excellent extremely fine particle separation effects, low application mixing amount, environmental friendliness, excellent performances and the like; clear liquid obtained after separation meets requirements of municipal sewage discharge standards. The novel mud-water separation material can be used as a flocculating agent for treatment processes of mechanical centrifugal separation and stirring standing separation and is applicable to mud-water separation of high-solid-content waste slurry generated in building construction.

Description

technical field [0001] The invention relates to a mud-water separation material, which is especially suitable for the mud-water separation of waste mud with high solid content, in particular to a novel mud-water separation material for waste mud with high solid content and a preparation method thereof. Background technique [0002] At present, my country is in the period of large-scale construction of infrastructure such as railways, highways, water conservancy, and municipal facilities. During the construction process, a large amount of waste mud (waste mud from pile foundation and shield construction) is produced, which has brought great environmental pollution and increased the cost of various construction projects. The economic burden of enterprises has also seriously affected the advancement of civilized construction. Due to the high solid content, many small particles and complex composition of waste mud, using existing flocculant agents and processes for sludge-water s...

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Problems solved by technology

CN102633310B Chinese patent discloses a kind of high-efficiency mud mud-water separation agent, with polyacrylamide, gel breaker aluminum sulfate and sodium carbonate as main components to prepare a kind of high-efficiency mud mud-water separation agent suitable for pile foundation engineering waste mud in the construction field, Save a lot of land resources, reduce the pollution of water resources, but did not mention the separation efficiency of waste mud mud water; CN104724810B Chinese patent discloses a kind of environmental protection flocculant with natural polymer as the main component, with chitosan- Natural polymers such as lignin or chitosan-fulvic acid graft copolymer, carboxymethyl starch, montmorillonite and activated carbon are used as the main components to obtain a flocculant, which realizes the green and environmentally friendly flocculation treatment of waste mud. However, there is no mention of the treatment of high solid phase waste mud

CN101633527B Chinese patent discloses a composite polymer flocculant, its main components are elm grass powder, cactus powder, sodium carboxymethyl cellulose and polyacrylamide raw materials, the flocculant can be normal under higher temperature and alkaline conditions Use, but the amount of dehydration flocculant is large and the cost is high

The above inventions mainly focus on low-cost and environmentally-friendly treatment of waste mud, but do not effectively solve the problems of low solid phase separation rate and high flocculant content of high-solid waste mud.

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