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Method for Harmless and Recycling of Heavy Metals in Ashes of Domestic Garbage Power Generation

A technology for domestic waste and domestic waste incineration, which is applied in the field of new ecological and environmental protection materials, and can solve problems such as unsafe and effective disposal

Active Publication Date: 2020-03-27
冯乃谦 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to experts, there is no safe and effective treatment of heavy metals in domestic waste ash at home and abroad.

Method used

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  • Method for Harmless and Recycling of Heavy Metals in Ashes of Domestic Garbage Power Generation
  • Method for Harmless and Recycling of Heavy Metals in Ashes of Domestic Garbage Power Generation
  • Method for Harmless and Recycling of Heavy Metals in Ashes of Domestic Garbage Power Generation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix domestic waste incineration fly ash and ash at a ratio of 100:0 to obtain material A; mix glass powder material B with material A at a ratio of 3:7; then mix in a mass of (material A + material B )×8% material C. Mix evenly together and form balls in the ball forming plate; when forming balls, the ball forming plate rotates while spraying water glass aqueous solution to obtain raw material balls with a particle size of 5-10mm. Raw meal balls are fired into ceramsite in a high-temperature furnace; when the temperature of the combustion furnace is 600-700°C, put in raw meal balls, continue to heat up to 950°C, and keep the temperature constant for 20 minutes to obtain fly ash (ash slag)-glass ceramsite. (Code name pottery 1). The bulk density of ceramsite is 780kg / m3, the saturated water absorption rate is 19%, and the cylinder compressive strength is 4.5-5.0MPa.

[0032] Mix the code (ceramic 1) and the hydrophobic emulsion in a mixer at a mass ratio of 1:0.1, so tha...

Embodiment 2

[0045] Mix domestic waste incineration fly ash and ash at a ratio of 100:100 to obtain material A; mix glass powder material B with material A at a ratio of 5:5; then mix in a mass of (material A + material B ) × 7% of material C. Mix together and form into balls in the ball forming plate; when forming balls, the ball forming plate rotates while spraying water glass aqueous solution to obtain raw material balls with a particle size of 5-10mm. Raw meal balls are fired into ceramsite in a high-temperature furnace; when the temperature of the combustion furnace is 600-700°C, put in raw meal balls, continue to heat up to 850°C, and keep the temperature constant for 20 minutes to obtain fly ash (ash slag)-glass ceramsite. (Code name pottery 2). Ceramsite bulk density is 700kg / m3, saturated water absorption rate is 19%, cylinder compressive strength is 4.5MPa.

[0046] Mix the code (ceramic 2) and hydrophobic emulsion in a mixer at a mass ratio of 1:0.1 to obtain hydrophobic ceramsi...

Embodiment 3

[0059]Mix domestic waste incineration fly ash and ash at a ratio of 0:100 to obtain material A; mix glass powder material B with material A at a ratio of 6:4; then add the mass of (material A + material B) ×7% C material. Mix together evenly and form into balls in the ball forming plate; when forming into balls, the ball forming plate rotates while spraying water glass aqueous solution to obtain raw material balls with a particle size of 5-10mm. Raw meal balls are fired into ceramsite in a high-temperature furnace; when the temperature of the combustion furnace is 600-700°C, put in raw meal balls, continue to heat up to 850°C, and keep the temperature constant for 20 minutes to obtain fly ash (ash slag)-glass ceramsite. (Code name Tao 3). The bulk density of ceramsite is 650kg / m3, the saturated water absorption rate is 20%, and the cylinder compressive strength is 4.0MPa. Mix the code name (Tao 3) and the hydrophobic emulsion in a mixer at a mass ratio of 1:0.1 to obtain Hydro...

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Abstract

The invention relates to a method for utilizing domestic garbage power generation fly ash and slag and waste glass abrasive powder as main raw materials to fire ceramsite. According to the method, heavy metal elements in the ash is cured by high-temperature firing; the heavy metal elements are sprayed on the surface of ceramsite by a hydrophobic emulsion, so that ceramsite holes are sealed, the surface is hydrophobic, and outward diffusion and permeation of residual heavy metal elements are prevented; when the ceramiste is utilized to prepare multifunctional concrete, the ceramsite is furtherwrapped by cement mortar. Detection of an environmental protection department shows that the heavy metal content in the cement mortar can meet a three-level soil quality requirement in GB15618-1995 and meet a HJ / T298-2007 hazardous waste identification technique requirement; heavy metal elements in domestic garbage power generation fly ash and slag become harmless; the multifunctional concrete produced from the ceramsite can be applied to the related fields of construction; the domestic garbage power generation fly ash and slag become useful resources.

Description

technical field [0001] The invention relates to a method for making ceramsite and multifunctional concrete by using domestic waste power generation ash and waste glass as main raw materials, and making heavy metals in the ash harmless and resourceful. It belongs to the field of ecological and environmental protection new materials. (Note: Ashes include fly ash collected from chimneys and slag on firing grates) [0002] technical background [0003] According to the survey, for every 1,000 tons of household waste incinerated to generate electricity, 100 tons of slag and 30 tons of fly ash will be produced. Both contain a lot of heavy metal elements. The fly ash of electric dust collection has not been processed so far. The domestic waste power plant entrusts others to process the fly ash with coupling agent and cement, and then store it in the ravine; the cost of fly ash per ton is about 1,400 yuan. A certain domestic waste incineration power generation in my country The fac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/02C04B20/10C04B28/02
Inventor 冯乃谦季元升季龙泉杨青张志龄江新理侯莉民
Owner 冯乃谦
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