Garbage incineration ash slag heavy metal solidifying method

A technology of waste incineration ash and waste incineration fly ash, which is applied in the direction of cement production and process efficiency improvement, can solve the problems of excessive heavy metal content in permeable bricks, high risk of heavy metal secondary pollution, and high risk of heavy metal pollution, achieving significant economic and economic benefits. Double benefits of environmental protection, avoid heavy metal ion leaching, low cost effect

Active Publication Date: 2019-03-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: large amount of wastewater treatment, high energy consumption for soluble salt recovery, excessive heavy metal content in the prepared permeable bricks, and high risk of heavy metal pollution
[0007] In summary, the existing solidification methods for heavy metals in waste incineration ash have problems such as low resource utilization value, high risk of heavy metal secondary pollution, and large amount of wastewater treatment.

Method used

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  • Garbage incineration ash slag heavy metal solidifying method

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Effect test

Embodiment 1

[0037] The bottom ash of waste incineration is sorted by eddy current, and the waste metal with conductivity > 10 is sorted out, and the bottom ash of waste incineration without waste metal with conductivity ≤ 10 is crushed to ≤ 2.0mm, and fine Bottom slag. Mix 5 parts of fine bottom slag and 1 part of waste incineration fly ash evenly, heat to 1300°C and melt for 3.0 hours to obtain a melt, and water quenched to obtain water quenched slag. Water quenching slag is used to make cement, and the addition amount of water quenching slag is 10wt%; the leaching concentration of Cr in cement products is 2.79mg / L, the leaching concentration of Pb is 1.22mg / L, the leaching concentration of Cd is 0.47mg / L, and the leaching concentration of Ni is 0.47mg / L. The concentration is 4.27mg / L, the leaching concentration of Zn is 89.71mg / L, and the leaching concentration of Cu is 65.03mg / L.

Embodiment 2

[0039]The bottom ash of waste incineration is sorted by eddy current, and the waste metal with conductivity > 10 is sorted out, and the bottom ash of waste incineration without waste metal with conductivity ≤ 10 is crushed to ≤ 1.5mm, and fine Bottom slag. Mix 5 parts of fine bottom slag and 1 part of waste incineration fly ash evenly, heat to 1300°C and melt for 3.0 hours to obtain a melt, and water quenched to obtain water quenched slag. The water-quenched slag was remelted at 1300°C for 1.0h and nucleated and crystallized at 650°C for 3.0h to obtain glass-ceramic. The leaching concentration of Cr in glass-ceramic products is 0.23mg / L, the leaching concentration of Pb is 0.22mg / L, the leaching concentration of Cd is 0.11mg / L, the leaching concentration of Ni is 0.06mg / L, and the leaching concentration of Zn is 0.35mg / L. Cu leaching concentration is 0.41mg / L.

Embodiment 3

[0041] The bottom ash of waste incineration is sorted by eddy current, and the waste metal with conductivity > 10 is sorted out, and the bottom ash of waste incineration without waste metal with conductivity ≤ 10 is crushed to ≤ 2.0mm, and fine Bottom slag. Mix 4 parts of fine bottom slag and 1 part of waste incineration fly ash evenly, heat to 1350°C and melt for 2.5 hours to obtain a melt, and water quenched to obtain water quenched slag. Water quenching slag is used to make cement, and the addition amount of water quenching slag is 15wt%; the leaching concentration of Cr in cement products is 2.12mg / L, the leaching concentration of Pb is 2.35mg / L, the leaching concentration of Cd is 0.50mg / L, and the leaching concentration of Ni is 0.50mg / L. The concentration is 3.89mg / L, the leaching concentration of Zn is 75.22mg / L, and the leaching concentration of Cu is 51.78mg / L.

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Abstract

The invention discloses a garbage incineration ash slag heavy metal solidifying method, and belongs to the field of solid waste disposal and resource utilization. The method comprises the following steps of obtaining waste sundry metal and fine bottom slag after sorting and crushing of the garbage incineration ash slag; using the waste sundry metal for metal regeneration; performing mixing, fusingand water quenching on the bottom fine slag with the garbage incineration ash slag; using the water quenching slag for cement and crystallized glass, wherein the heavy metal in the product is lower than the limit value of Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity (GB 5085.3-2007). The method provided by the invention has the advantages that the process is simple; the industrialization is easy; the goals of safely solidifying garbage incineration ash slag heavy metal and recycling the garbage incineration ash slag heavy metal for cement and crystallized glass can be achieved.

Description

technical field [0001] The invention belongs to the field of solid waste disposal and resource utilization, and in particular relates to a method for solidifying heavy metals in garbage incineration ash. Background technique [0002] In 2017, the volume of domestic waste removal in my country reached 236 million tons, which continued to increase at a rate of about 10% per year. Waste incineration treatment has the ability to quickly reduce volume, reduce volume, and eliminate harm, and the treatment rate can reach 40%. Bottom slag accounts for about 25% to 30% of the weight of garbage, and fly ash accounts for about 3% to 5%. Because fly ash contains a certain amount of harmful substances, especially heavy metals such as Cr, Pb, Cd, Ni, Zn and Cu, it belongs to HW18 hazardous solid waste, and it must be solidified / stabilized before the processed product can be filled. Burial and resource utilization. Although the amount of heavy metals leached from the bottom slag basically...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/28C04B7/38C03C10/00C22B7/00
CPCC03C10/0063C04B7/28C04B7/38C22B7/005Y02P10/20Y02P40/10
Inventor 张深根张瑶刘波
Owner UNIV OF SCI & TECH BEIJING
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