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Silt hardening agent and preparation method and application method thereof

A technology of curing agent and sludge, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of large amount of inorganic curing material added, low curing efficiency, re-leaching, etc., to shorten the curing time, high curing efficiency, The effect of reducing moisture content

Active Publication Date: 2017-12-29
宁波国科微藻科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The patent uses lime and activated magnesia to adsorb the heavy metals precipitated in the sludge, but the adsorbed pollutants have the risk of leaching again and causing secondary pollution; the curing agent only uses inorganic curing materials such as cement, fly ash, Anhydrous gypsum and lime, the curing efficiency is low, and the addition of inorganic curing materials is large

Method used

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preparation example Construction

[0032] Wherein the preparation method of biomass activated carbon is: (1) impregnating biomass raw material (corn cob, coconut shell, palm shell, peanut shell, etc.) in 3mol / L ZnCl 2(solid-to-liquid mass ratio is 1: 2.5) the activation treatment of 3 days is carried out in the solution; (2) after centrifugal concentration, adopt SK2-2-10 type high-temperature tubular resistance furnace, make activation gas with water vapor (flow rate is 20L / h), heated to 600°C at a heating rate of 40°C / min for 1h activation, and finally obtained a preparation with a specific surface area of ​​2400m 2 / g of biomass activated carbon.

[0033] The preparation method of reduced graphene oxide is as follows: oxidizing graphite (500 mesh, Qingdao Tianyuan Graphite Co., Ltd.) with concentrated sulfuric acid / potassium permanganate, and then ultrasonically obtaining graphite oxide. Add acetylacetone to the graphite oxide aqueous solution, reflux at 80°C for 24 hours, filter, wash with ethanol, aceton...

Embodiment 1

[0038] The sludge solidifying agent is composed of sodium polyacrylate (molecular weight 1000, particle size is 300 mesh) 1%, biomass activated carbon 2%, sodium lignosulfonate 2%, polyrotaxane 1%, reduced graphene oxide 4%, cement 50% , quicklime (280 mesh) 5%, fly ash (300 mesh) 35% made.

[0039] The preparation method of the curing agent: mix and stir each raw material in a mixer according to the above mass fraction, and stir for 30 minutes.

[0040] Subsequently, the above-mentioned curing agent was added into the sludge at a mixing ratio of 20%, and after being thoroughly mixed in a mixer, it was cured for 7 days under natural sunlight.

Embodiment 2

[0042] Sludge curing agent consists of sodium polyacrylate (molecular weight 3000, particle size is 300 mesh) 2%, biomass activated carbon 3%, sodium lignosulfonate 3%, polyrotaxane 2%, reduced graphene oxide 10%, cement 40% , 10% quicklime (280 mesh) and 30% fly ash (325 mesh).

[0043] The preparation method of the curing agent: mix and stir each raw material in a mixer according to the above mass fraction, and stir for 25 minutes.

[0044] Subsequently, the above-mentioned curing agent was added into the sludge at a blending ratio of 17%, and after being thoroughly mixed in a mixer, it was cured for 7 days under natural sunlight.

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PUM

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Abstract

The invention relates to a silt hardening agent. The silt hardening agent is characterized by comprising, by weight, 1%-5% of sodium polyacrylate, 2%-8% of biomass activated carbon, 2%-7% of sodium lignin sulfonate, 1%-5% of polyrotaxane, 4%-25% of reduced graphene oxide, 15%-50% of cement, 5%-25% of quicklime and 10%-35% of coal ash. The hardening agent is non-toxic and harmless and can be used on a large scale; synergistic effect among the raw materials is achieved, moisture content of silt can be effectively reduced, and strength of the silt is improved to meet requirements of earthwork reclamation; heavy metals and organic substances in the silt can be effectively sealed, and risk of secondary exposure of pollutants is avoided.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge solidifying agent, a preparation method and an application method thereof. Background technique [0002] Rivers, lakes, etc. are prone to silt due to the slow flow of water. A large amount of silt will be produced in the dredging and widening of rivers and waterways in our country, as well as the new construction and expansion of ports. These silts generally have the characteristics of high moisture content, high clay content, high compressibility and low strength, and are difficult to be directly used by projects. Cement, quicklime, bentonite, zeolite powder, polyaluminum iron silicate, sodium polyacrylate and other slag silicate and high polymer materials are usually used as curing agents to promote the hydration of the curing agent to produce gelatinous substances that cement the sludge particles. Reduce the moisture content of silt and increase the strength of silt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C02F11/14
CPCC02F11/14C04B28/02C04B2111/00767C04B24/2641C04B14/022C04B24/18C04B24/00C04B14/024C04B22/064C04B18/08
Inventor 任红星范娟刘荣华
Owner 宁波国科微藻科技有限公司
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