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Curing method for heavy metal in waste catalyst

A technology of waste catalyst and solidification method, which is applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as pollution, achieve the effects of preventing environmental pollution, saving land resources, and achieving sustainable development

Inactive Publication Date: 2018-07-31
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a solidification method for heavy metals in waste catalysts. The technical problem to be solved is to be able to effectively solidify heavy metal elements in waste catalysts under conventional conditions, and to solve the environmental pollution caused by waste catalyst landfills. Reduce the harm of heavy metals to the environment, while improving resource utilization, reducing waste emissions, and achieving sustainable development

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  • Curing method for heavy metal in waste catalyst

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specific example

[0065] Adopt the solidification method of heavy metal in the above-mentioned spent catalyst to carry out concrete example as follows:

[0066] In the following examples 1-3, the spent catalyst used is FCC spent catalyst, the main chemical composition content of the FCC spent catalyst is shown in Table 1, and the heavy metal content of the FCC spent catalyst is shown in Table 2.

[0067] Table 1 Contents of main chemical components of spent FCC catalysts

[0068] chemical composition

SiO 2

Al 2 o 3

Fe 2 o 3

K 2 o

Na 2 o

Content (wt%)

39.6

50.7

1.73

0.17

0.16

[0069] Table 2 Heavy metal content of FCC spent catalysts

[0070] heavy metal

Embodiment 1

[0072] 1) Grinding the spent FCC catalyst so that the 7d activity index is 21, and the 28d activity index is 29;

[0073] 2) 15wt% 42.5 grade ordinary silicate is mixed with 10wt% FCC waste catalyst powder and 75wt% red brick fine powder (0.1-5cm particle size) to obtain the first mixture; the lignin water reducer ( Weight accounted for 0.02wt% of the total weight of the first mixture) was dissolved in water (weight accounted for 15wt% of the total weight of the first mixture), to obtain the second mixture;

[0074] Stirring the first mixture in a mixer for 20 minutes, adding the second mixture dropwise to the first mixture during the stirring process, mixing the first mixture and the second mixture uniformly to obtain a mixture;

[0075] 3) Seal the above mixture and age it for 6 hours;

[0076] 4) Fill the mold with the aged mixture, press and form it on a press to obtain an adobe, the pressing pressure is 20MPa, and the size of the adobe is: length×width×height=195mm×95mm×...

Embodiment 2

[0084] 1) Grinding the spent FCC catalyst so that the 7d activity index is 29, and the 28d activity index is 42;

[0085] 2) Mix 20wt% 42.5-grade ordinary silicate with 20wt% FCC waste catalyst powder, 30wt% fine sand (0.2-1cm in size), and 30wt% stones (1-5cm) to obtain the first mixture ; The lignin water reducer (weight accounts for 0.04wt% of the total weight of the first mixture) is dissolved in water (the weight accounts for 10wt% of the total weight of the first mixture) to obtain a second mixture;

[0086] Stirring the first mixture in a mixer for 16 minutes, adding the second mixture dropwise to the first mixture during the stirring process, mixing the first mixture and the second mixture evenly to obtain a mixture;

[0087] 3) Seal the above mixture and age it for 10 hours;

[0088] 4) Fill the mold with the aged mixture, press and form it on a press to obtain an adobe, the pressing pressure is 30MPa, and the size of the adobe is: length×width×height=240mm×115mm×53m...

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Abstract

The invention relates to a curing method for heavy metal in a waste catalyst. The method comprises the following steps: grinding the waste catalyst to obtain waste catalyst powder, wherein the waste catalyst contains heavy metal; mixing the curing agent, admixture, an additive, the waste catalyst powder with water to obtain a mixture; sealing the mixture and ageing the mixture; compressing and shaping the aged mixture to obtain a green brick and maintaining the green brick to obtain a baking-free brick containing heavy metal. Results of a heavy metal element leaching test on the baking-free brick show that the method disclosed by the invention can effectively cure the heavy metal in the heavy metal. The method disclosed by the invention solves the problem of environmental pollution causedby waste catalyst landfill, reduces damage of the heavy metal to environment, improves a resource utilization rate at the same, reduces waste emission and achieves sustainable development.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment, in particular to a method for solidifying heavy metals in spent catalysts. Background technique [0002] Heavy metal pollution is harmful and covers a wide area. my country's cultivated land is seriously affected by heavy metal pollution, soil pollution is increasing day by day, and the prevention and control situation is very severe. At present, the research on heavy metal pollution focuses on the remediation technology of heavy metal-contaminated soil, but soil remediation is expensive, time-consuming, and the treatment process is complicated, which is prone to secondary pollution. The control of industrial pollution can reduce its pollution through some technical methods and management measures, and finally meet the national pollutant discharge standards. However, because heavy metals will not degrade in the environment, they are prone to form and valence under different env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/04
CPCC04B28/04C04B2111/00784C04B18/16C04B24/18C04B18/0472C04B14/06C04B14/02Y02W30/91
Inventor 刘振森聂卿何捷萧瑛崔敬轩
Owner CHINA BUILDING MATERIALS ACAD
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