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Waste incineration fly ash resource method based on magnesium potassium phosphate adhesive

A technology of potassium magnesium phosphate adhesive and waste incineration fly ash, which is applied in the field of resource utilization of hazardous waste, can solve the problems of late strength shrinkage, fast condensation, and large concentrated release of hydration heat, etc., and achieve low leaching concentration and overcoming strength The effect of retraction and simple production process

Inactive Publication Date: 2014-11-05
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the existing curing / stabilizing heavy metal hazardous waste technology, acidic compounds affect the curing effect of Portland cement, and the cost of pretreatment needs to be increased, and the hardened Portland cement has a high porosity, and the solidified hazardous waste is easy to Leaching secondary pollution to the environment and other defects; in view of the problems of MKPC-based materials such as fast condensation, condensation can not be effectively controlled, a large amount of concentrated release of hydration heat and later strength shrinkage, etc., the primary purpose of the present invention is to provide a kind of adhesive based on magnesium potassium phosphate Resource recovery method of waste incineration fly ash

Method used

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  • Waste incineration fly ash resource method based on magnesium potassium phosphate adhesive
  • Waste incineration fly ash resource method based on magnesium potassium phosphate adhesive
  • Waste incineration fly ash resource method based on magnesium potassium phosphate adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Get the dead burnt magnesium oxide powder (wherein MgO, CaO and SiO 2 The mass fractions are 96.8%, 1.33% and 0.92%, respectively, and the specific surface area is 216m 2 kg -1 , the same below) and 28 parts by mass of potassium dihydrogen phosphate (the main particle size is 40 / 350~60 / 245 (mesh / μm), the same below), and 8 parts by mass of composite retarder (sodium tetraborate: ten Disodium hydrogen phosphate dihydrate:ammonium chloride=2:3:6, mass ratio) to prepare MKPC with a coagulation time of 65min. Get 15 mass parts (do contrast with 0 mass part simultaneously) the rubbish incineration fly ash (specific surface area is 450m 2 kg -1 , the same below) (admixed with a certain amount of lead nitrate and cadmium nitrate) and 85 parts by mass of the above-mentioned MKPC, externally mixed with 16 parts by mass of water. Use the NJ-160A cement slurry mixer to stir slowly for about 2 minutes to mix the components evenly, and then stir rapidly for 3 to 4 minutes to obt...

Embodiment 2

[0046] Take 30 parts by mass of waste incineration fly ash and 85 parts by mass of MKPC prepared in Example 1, and add 16 parts by mass of water. Use the NJ-160A cement slurry mixer to stir slowly for about 2 minutes to mix the components evenly, and then stir rapidly for 3 to 4 minutes to obtain the MKPC-based material slurry (the content of Pb in the slurry is about 12000mg / kg, and the content of Cd is about 3000mg / kg). Test the heavy metal leaching of MKPC-based material slurry hydration (temperature 10-30°C, ambient humidity 20-70%) for a certain period of time, the results are as follows Figure 5 shown. The leaching concentrations of heavy metals Pb and Cd in the MKPC-based material slurry after 7 days of hydration have been lower than the requirements of the "Hazardous Waste Identification Standard" (GB5085.3-2007) (dissolution rate of Pb≤5mg / L, dissolution rate of Cd≤ 1mg / L). With the prolongation of the hydration age, the leaching concentration of Pb in the MKPC-b...

Embodiment 3

[0048] Different mass parts of waste incineration fly ash and 85 mass parts of MKPC prepared in Example 1 were taken, and 16 mass parts of water were added. Use the NJ-160A cement slurry mixer to stir slowly for about 2 minutes to mix the components evenly, and then stir rapidly for 3 to 4 minutes to obtain the MKPC-based material slurry (the content of Pb in the slurry is about 12000mg / kg, and the content of Cd is about 3000mg / kg). Test the leaching of heavy metals when the MKPC-based material slurry is hydrated for 90 days, the results are as follows Figure 6 shown. The leaching concentrations of Pb and Cd in the MKPC-based hardened body gradually increased with the increase of the mass fraction of incineration fly ash. When the mass fraction of incineration fly ash reaches 37.5, the leaching concentration of Pb and Cd in the MKPC-based hardened body is still lower than the requirements of the "Hazardous Waste Identification Standard" (GB5085.3-2007) (the leaching concen...

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Abstract

The invention discloses a waste incineration fly ash resource method based on a magnesium potassium phosphate adhesive. The method comprises the following steps: taking 30-50 parts by weight of dead-burnt magnesia powder and 20-30 parts by weight of monopotassium phosphate and doping 6-12 parts by weight of a composite retarder composed of sodium tetraborate, sodium phosphate dibasic dodecahydrate and inorganic chlorine salt so as to prepare the magnesium potassium phosphate adhesive (MKPC); taking 10-40 parts by weight of waste incineration fly ash and 50-80 parts by weight of MKPC and doping 10-20 parts by weight of water, mixing and uniformly stirring to obtain MKPC-based material slurry; and carrying out pouring or extrusion molding on the MKPC-based material slurry, and maintaining in the natural air environment so as to obtain an MKPC-based material product. By coating waste incineration fly ash with the MKPC, no preprocessor is required for processing fly ash. The preparation technology is simple, and solidification is carried out at normal temperature. Leaching concentration of heavy metal in a solidified body is low, and secondary pollution will not be caused. In addition, compressive strength also meets building requirements.

Description

technical field [0001] The invention relates to a resource recovery method of hazardous waste, in particular to a waste incineration fly ash resource recovery method based on potassium magnesium phosphate adhesive. Background technique [0002] With the acceleration of my country's urbanization process, the amount of urban waste has increased sharply, and its discharge has constituted a serious threat and impact on the natural environment. The incineration method has the advantages of high efficiency, rapid capacity reduction, and high energy utilization rate, and has become one of the main treatment methods for urban waste. However, the incineration method will produce fly ash accounting for 0.5-5.0% of the total amount of garbage, which is rich in harmful heavy metals such as Pb, Cd, Cr, Zn, Cu, etc. It is clearly listed as hazardous waste in the National Hazardous Waste List (waste category: HW18, waste code: 802-002-18). Solidification / stabilization technology is an ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34C04B18/06
CPCY02W30/91
Inventor 杨建明苏瑛张林杰张瑶潘博张鑫
Owner YANCHENG INST OF TECH
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