Harmless and resourceful treatment method for smelting slag generated during iron capture of waste catalysts

A disposal method and technology for smelting slag, which is applied in the field of harmless and resourceful disposal of smelting slag from iron-captured waste catalysts, can solve the problems of non-resource utilization, waste of land, and increased cost, and achieve low leaching concentration and avoid pollution , the effect of reducing energy consumption

Active Publication Date: 2020-02-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the vitreous body has a certain curing ability for heavy metals, there is still a significant risk of toxic leaching, and the existing landfill disposal method is not only costly, but also wastes a lot of land
[0004] Therefore, there is an urgent need for economical and effective disposal solutions for iron capture smelting slag, which has potential toxicity leaching risks, increased costs caused by landfills, and non-resource utilization.

Method used

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  • Harmless and resourceful treatment method for smelting slag generated during iron capture of waste catalysts
  • Harmless and resourceful treatment method for smelting slag generated during iron capture of waste catalysts
  • Harmless and resourceful treatment method for smelting slag generated during iron capture of waste catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]The smelting slag of PGMs, an iron-captured waste vehicle exhaust catalyst, is directly cast and rolled to obtain the basic glass. The chemical composition of the basic glass is: SiO 2 :22%, CaO:20%, Al 2 o 3 25%, Na 2 O:10%, MgO:5%, ZrO 2 :5%, CeO 2 :4%, Fe 2 o 3 :2%, CaF 2 :3%, MnO:1.5%, TiO 2 :0.5%, BaO:0.4%, Cr 2 o 3 :0.3%, NiO:0.2%, CuO:0.2%, PbO:0.3%, V 2 o 5 : 0.2%, As: 0.1%, Others: 0.3%. The basic glass is heat-treated at 700°C for 120 minutes. Under this condition, nucleation and crystallization proceed simultaneously to form a crystallized glass with uniform distribution of crystallites, and finally anneal to eliminate stress to obtain a glass-ceramic product. Such as figure 1 As shown, the main crystal phase of glass-ceramic is calcium aluminate feldspar and a small amount of nepheline, which solidifies heavy metals in the crystal phase; the leaching concentration of heavy metals in the product is much lower than that in the "Leaking Toxicity Id...

Embodiment 2

[0039] The smelting slag of PGMs, an iron-captured waste vehicle exhaust catalyst, is directly cast and rolled to obtain the basic glass. The chemical composition of the basic glass is: SiO 2 : 23%, CaO: 21%, Al 2 o 3 24%, Na 2 O: 12%, MgO: 5.5%, ZrO 2 :4%, CeO 2 :3%, Fe 2 o 3 :3%, CaF 2 :2%, MnO:0.5%, TiO 2 :1.0%, Cr 2 o 3 : 0.1%, NiO: 0.05%, CuO: 0.1%, PbO: 0.2%, As: 0.05%, others: 0.4%. The basic glass is heat treated at 730°C for 100 minutes. Under this condition, nucleation and crystallization proceed simultaneously to form a crystallized glass with uniform distribution of crystallites, and finally anneal to eliminate stress to obtain a glass-ceramic product. The main crystal phase of the glass-ceramics is calcium aluminum feldspar, which solidifies heavy metals in the crystal phase, and the leaching concentration of heavy metals in the product is much lower than the "Leaking Toxicity Identification of Hazardous Waste Identification Standards" (GB5085.3-2007), ...

Embodiment 3

[0041] The smelting slag of PGMs, an iron-captured waste vehicle exhaust catalyst, is directly cast and rolled to obtain the basic glass. The chemical composition of the basic glass is: SiO 2 : 24%, CaO: 21%, Al 2 o 3 25%, Na 2 O: 6%, MgO: 7%, ZrO 2 :5%, CeO 2 :4%, Fe 2 o 3 :2%, CaF 2 :2.2%, MnO:1.0%, TiO 2 :0.7%, BaO:0.5%, Cr 2 o 3 : 0.2%, NiO: 0.15%, CuO: 0.12%, CdO: 0.1%, PbO: 0.3%, V 2 o 5 : 0.1%, As: 0.05%, Others: 0.6%. The basic glass is heat-treated at 750°C for 90 minutes. Under this condition, nucleation and crystallization proceed simultaneously to form a crystallized glass with uniform distribution of crystallites, and finally anneal to eliminate stress to obtain a glass-ceramic product. The main crystal phase of the glass-ceramics is calcium aluminum feldspar, which solidifies heavy metals in the crystal phase, and the leaching concentration of heavy metals in the product is much lower than the "Leaking Toxicity Identification of Hazardous Waste Ident...

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Abstract

The invention relates to the technical field of harmless and resourceful treatment of solid waste and provides a harmless and resourceful treatment method for smelting slag generated during iron capture of waste catalysts. The method comprises the following steps: directly carrying out casting and calendering to obtain base glass by using glassy-state smelting slag generated by capturing a waste catalyst with iron as a raw material and heavy metals such as Fe2O3, Cr2O3, TiO2, NiO and PbO in the smelting slag as nucleating agents without adding any other reagent; subjecting the base glass to synchronous nucleation and crystallization at a certain temperature; and performing annealing to eliminate stress so as to obtain a microcrystalline glass product. The method has the advantages that heavy metal in the smelting slag generated smelting slag generated during iron capture of waste catalysts is solidified, so pollution is avoided; nucleation and crystallization heat treatment are synchronously carried out, so the method has the advantages of short flow, low energy consumption and easiness in industrial production; the harmless and resourceful utilization of the smelting slag is realized; the added value of the obtained microcrystalline glass is high; obvious environmental protection and economic benefits are obtained; and the method has good market prospects.

Description

technical field [0001] The invention relates to the technical field of harmless and resourceful solid waste, in particular to a method for harmless and resourceful disposal of smelting slag from iron-trapping spent catalysts. Background technique [0002] Platinum group metals (PGMs) have excellent physical and chemical properties such as high stability, corrosion resistance, and good catalytic activity. They are widely used in the fields of automobiles, petroleum, electronic appliances, chemicals, aerospace, and environmental protection. They belong to strategic Metal. There is an extreme shortage of PGMs in my country, the reserves are only 320 tons (accounting for 0.4% of the world), and the basic reserves are only 14.6 tons. In 2018, my country's annual demand for platinum group metals exceeded 150 tons, accounting for about 30% of the global total, and the contradiction between supply and demand is very prominent. Spent catalyst is the most important source of seconda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/00C03C6/10C03B32/02C03C4/20
CPCC03B32/02C03C1/002C03C4/20C03C10/0063
Inventor 丁云集张深根
Owner UNIV OF SCI & TECH BEIJING
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