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Preparation method for preparing facing bricks by modifying household waste incinerated fly ash

A domestic waste incineration and fly ash technology, which is applied in the field of fly ash treatment, can solve the problems that the solidified fly ash cannot be utilized as a resource, the landfill cost of hazardous waste is high, and dioxin cannot be destroyed. Sustainable development, saving landfill costs and land resources, and promoting low-carbon development

Inactive Publication Date: 2019-03-08
SHANGHAI INST OF TECH
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Problems solved by technology

[0004] First of all, the cost of landfilling hazardous waste landfills is quite high. If all fly ash is disposed of in hazardous waste landfills, the annual landfill cost can reach hundreds of millions of yuan; Disposal, but previous pre-processing costs were higher
Secondly, fly ash landfill occupies a large amount of land resources, and the solidified body of fly ash filled in the landfill cannot be used as a resource; moreover, fly ash landfill cannot destroy dioxins and completely block the leaching of heavy metals, which has the potential to cause secondary pollution. the potential for

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  • Preparation method for preparing facing bricks by modifying household waste incinerated fly ash

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[0018] The invention provides a method for preparing decorative bricks modified by domestic waste incineration fly ash, which comprises the following steps:

[0019] 1) Using 0.5 mol / L NaOH solution as a modifier, mixing the modifier with domestic waste incineration fly ash according to a certain solid-to-liquid ratio, then washing with water, suction filtering, and drying to obtain modified fly ash; Among them, the liquid-solid ratio of modifier and fly ash is 1:10, the time of modification treatment is 8h, and the stirring speed is 120rpm;

[0020] 2) After mixing the modified fly ash, clay and feldspar, place it in a drying room for ventilation and drying for 36 to 48 hours at a drying temperature of 20±5°C, and then grind it. The equipment used for grinding is combined grinding equipment. The grinding equipment includes jaw crusher and Raymond mill. When grinding, the mixed material is firstly crushed in the jaw crusher, and the material after primary crushing is transport...

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Abstract

The invention relates to a preparation method for preparing facing bricks by modifying household waste incinerated fly ash. The preparation method comprises the following steps: taking a NaOH solutionas a modifier, mixing and stirring with fly ash, and washing with water, performing suction filtration and drying to obtain modified fly ash; mixing the modified fly ash, china clay and feldspar, performing aeration-drying in a drying chamber for 36-48 hours, grinding, adding the material obtained by grinding into a stirrer, adding water to stir, standing at a room temperature for 12-24 hours soas to age, and screening the aged material by a screen of 50-100 meshes; and performing compression molding on the aged and screened material on a brick making machine, drying the molded green body ina dry kiln for 12+ / -2 hours, and calcining the dried green body in a smelting furnace, thereby obtaining the product. According to the method disclosed by the invention, potential secondary pollutionof the fly ash in the landfill process can be avoided, potential hazards to the society are reduced, and lots of fly ash safety landfill disposal cost and land resources can be saved.

Description

[technical field] [0001] The invention relates to the technical field of fly ash treatment, in particular to a preparation method for modifying decorative bricks with domestic waste incineration fly ash. [Background technique] [0002] Waste incineration fly ash is a secondary pollutant (hereinafter referred to as fly ash) produced in the process of waste incineration, and its production rate is generally 2-5%. Fly ash is rich in harmful substances such as heavy metals, dioxins, and dissolved salts, and is listed as a hazardous waste by many countries. It needs to be pretreated before it can be landfilled or reused. [0003] At present, there are two main safe treatment and disposal methods for fly ash in China: one is to carry out solidification / stabilization treatment before entering the hazardous waste landfill; the other is to meet more stringent leaching indicators through pretreatment (life Landfill Pollution Control Standard (GB168892-2008)) can be sent to sanitary l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/135B28B3/00B28B11/24B28B17/02
CPCB28B3/00B28B11/243B28B17/026C04B33/1355C04B2235/3418C04B2235/3463C04B2235/3472C04B2235/349Y02P40/60
Inventor 张海英
Owner SHANGHAI INST OF TECH
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