Method for preparing microcrystalline glass from hazardous solid wastes

A technology of glass-ceramic and waste glass, which is applied in the field of environmental protection and resource reuse, can solve the problems of unsafe disposal of dangerous solids, heavy metal pollution, serious secondary pollution, etc., and achieve high value of harmless solids Utilization, significant environmental protection and economic benefits, low leaching concentration effect

Active Publication Date: 2015-03-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common problem of the wet process is that the secondary pollution is serious, which is more suitable for the reduction of heavy metals and cannot solve the problem of heavy metal pollution
The above patents related to glass-ceramics all use raw ore and slag as raw materials, do not involve the solidification effect of heavy metals in glass-ceramics, and do not have the effect of safely disposing of dangerous solids

Method used

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  • Method for preparing microcrystalline glass from hazardous solid wastes
  • Method for preparing microcrystalline glass from hazardous solid wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Mix 60.0wt.% of waste incineration ash and 40.0wt.% of waste glass evenly, and the mixture contains Cr 0.8 wt.%, Pb 1.4 wt.%, Ni 2.0 wt.%, Cd 2.0 wt.%, Zn 5.0 wt.% , Cu 2.1 wt.%. The mixture is heated to 1550°C to melt to obtain a melt, which is rolled to obtain a basic glass, then heated to 750°C to nucleate to obtain a nucleated glass, and then heated to 950°C to crystallize to form a crystallized glass with uniform distribution of crystallites, and finally annealed to eliminate Stress results in a glass-ceramic product. The bending strength of the glass-ceramic is 70.0 MPa, the microhardness is 6.0GPa, the compressive strength is 450.0MPa, and the wear amount is 0.040g / cm 2 , the acid resistance (20wt% sulfuric acid) is 96.0%, the alkali resistance (20wt% sodium hydroxide) is 98.0%, the leaching concentration of Cr is 0.2 mg / L, the leaching concentration of Pb is 0.07 mg / L, and the leaching concentration of Cd is 0.6 mg / L, the leaching concentration of Ni is 0.25 ...

Embodiment 2

[0047] Mix 50 wt.% of stainless steel slag and 50 wt.% of quartz sand evenly, and the mixture contains Cr 4.0 wt.%, Pb 0 wt.%, Ni 0.5 wt.%, Cd 0 wt.%, Zn 0.7 wt.%, Cu 1.1 wt.%. The mixture is heated to 1550°C to melt to obtain a melt, which is rolled to obtain a basic glass, then heated to 750°C to nucleate to obtain a nucleated glass, and then heated to 950°C to crystallize to form a crystallized glass with uniform distribution of crystallites, and finally annealed to eliminate Stress results in a glass-ceramic product. The bending strength of the glass-ceramic is 150.0MPa, the microhardness is 7.8GPa, the compressive strength is 792.0MPa, and the wear amount is 0.100g / cm 2 , the acid resistance (20wt% sulfuric acid) is 97.1%, the alkali resistance (20wt% sodium hydroxide) is 98.4%, the leaching concentration of Cr is 5.0 mg / L, the leaching concentration of Pb is 0 mg / L, and the leaching concentration of Cd is 0 mg / L, the leaching concentration of Ni is 0.15 mg / L, the leac...

Embodiment 3

[0049] Mix 20wt.% of electroplating sludge, 40wt.% of limestone and 40wt.% of waste glass evenly. The mixture contains Cr 2.4 wt.%, Pb 1.4 wt.%, Ni 0 wt.%, Cd 1.2 wt.%, Zn 3.5 wt.%, Cu 5.0 wt.%. The mixture is heated to 1550°C to melt to obtain a melt, which is rolled to obtain a basic glass, then heated to 750°C to nucleate to obtain a nucleated glass, and then heated to 950°C to crystallize to form a crystallized glass with uniform distribution of crystallites, and finally annealed to eliminate Stress results in a glass-ceramic product. The bending strength of the glass-ceramic is 100.0 MPa, the microhardness is 6.5GPa, the compressive strength is 550.0MPa, and the wear volume is 0.050g / cm 2 , the acid resistance (20wt% sulfuric acid) is 98.2%, the alkali resistance (20wt% sodium hydroxide) is 98.8%, the leaching concentration of Cr is 0.22 mg / L, the leaching concentration of Pb is 0.15 mg / L, and the leaching concentration of Cd is 0.11 mg / L, the leaching concentration of...

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Abstract

The invention discloses a method for preparing microcrystalline glass by taking hazardous solid wastes which are hazardous solids for short. The method is characterized by taking heavy metals in the hazardous solids as nucleating agents, mixing, fusing, rolling, nucleating, crystallizing and annealing to obtain the microcrystalline glass. The method has the advantages that the heavy metal elements in waste incineration ash, stainless steel slag, stainless steel acid pickling sludge, electroplating sludge, chromium slag, lead-zinc smelting slag and coal ash can be stably solidified; the pollution is avoided; meanwhile, high-additional-value microcrystalline glass is prepared; the harmless high-value application of the hazardous solids is realized; and the method has remarkable environmental and economic benefits and wide market prospects.

Description

technical field [0001] The invention discloses a method for preparing glass-ceramics by using hazardous waste (hazardous solid waste) as a raw material, and belongs to the field of environmental protection and resource reuse. Glass-ceramic was prepared by fusion method using heavy metals in solid as nucleating agent. The invention has the advantages of realizing stable solidification of heavy metal elements by utilizing the glass-ceramic, avoiding pollution and obtaining the glass-ceramic with high added value. Background technique [0002] Industrial production produces a large amount of solid waste, including a large number of various hazardous substances containing heavy metals, which seriously threaten people's health and the safety of the ecological environment. The hazardous solids with large volume and wide range mainly include garbage incineration ash, stainless steel slag, stainless steel pickling sludge, electroplating sludge, chromium slag, lead-zinc smelting s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C6/10C03C10/00
CPCC03C10/00
Inventor 张深根杨健刘波潘德安
Owner UNIV OF SCI & TECH BEIJING
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