Low-temperature ceramic solidification method for high-arsenic heavy metal sludge

A technology of heavy metal sludge and low-temperature ceramics, which is applied in the fields of comprehensive utilization of resources and environmental protection, can solve the problems of not reducing the content of toxic substances in ceramics, and achieve the effects of prolonging the standing time, stabilizing the internal structure, and reducing the content of additives

Inactive Publication Date: 2017-05-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the high-arsenic and heavy metal sludge solidification technology simply forms cement solidified blocks to

Method used

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  • Low-temperature ceramic solidification method for high-arsenic heavy metal sludge
  • Low-temperature ceramic solidification method for high-arsenic heavy metal sludge
  • Low-temperature ceramic solidification method for high-arsenic heavy metal sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The main components of high-arsenic heavy metal sludge in this example are shown in Table 1

[0031] Table 1 Main components of high-arsenic heavy metal sludge

[0032]

[0033] A low-temperature ceramic solidification method for high-arsenic heavy metal sludge, the specific steps are as follows:

[0034] (1) Ingredients: Weigh high-arsenic heavy metal sludge, fly ash, lime, gypsum, and activator (activator is calcium hydroxide) in proportion, and the mass percentage of each component is 50% High-arsenic heavy metal sludge, 38% fly ash, 9% lime, 2.5% gypsum, 0.5% activator (calcium hydroxide); among them, the fly ash is Class I fly ash, and the CaO content in quicklime is 98%;

[0035] (2) Mixing: Mix the high-arsenic heavy metal sludge, fly ash, lime, gypsum, and activator (calcium hydroxide) in step (1) evenly to obtain a mixed material;

[0036] (3) Static pressure molding: Under the condition of pressure of 5MPa, the mixed material in step (2) is sta...

Embodiment 2

[0042] Example 2: The main components of high-arsenic heavy metal sludge in this example are shown in Table 3

[0043] Table 3 Main components of high-arsenic heavy metal sludge

[0044]

[0045] A low-temperature ceramic solidification method for high-arsenic heavy metal sludge, the specific steps are as follows:

[0046] (1) Ingredients: Weigh high-arsenic heavy metal sludge, fly ash, lime, gypsum, and activator (activator is water glass) in proportion, and the mass percentage of each component is 10% High-arsenic heavy metal sludge, 50 % fly ash, 30% lime, 2.5% gypsum, 7.5% activator (water glass); among them, the fly ash is Class II fly ash, and the CaO content in quicklime is 99%;

[0047] (2) Mixing: Mix the high-arsenic heavy metal sludge, fly ash, lime, gypsum, and activator (water glass) in step (1) evenly to obtain the mixed material;

[0048] (3) Static pressure forming: Under the condition of pressure of 15 MPa, the mixture in step (2) is statically formed and...

Embodiment 3

[0054] Example 3: The main components of high-arsenic heavy metal sludge in this example are shown in Table 5

[0055] Table 5 Main components of high-arsenic heavy metal sludge

[0056]

[0057] A low-temperature ceramic solidification method for high-arsenic heavy metal sludge, the specific steps are as follows:

[0058](1) Ingredients: Weigh high-arsenic heavy metal sludge, fly ash, lime, gypsum, and activator (activator is calcium chloride) in proportion, and the mass percentage of each component is 32% High-arsenic heavy metal sludge, 47% fly ash, 18% lime, 2.5% gypsum, 0.5% activator (calcium chloride); among them, the fly ash is Class I fly ash, and the CaO content in quicklime is 96%;

[0059] (2) Mixing: Mix the high-arsenic heavy metal sludge, fly ash, lime, gypsum, and activator (calcium chloride) in step (1) evenly to obtain a mixed material;

[0060] (3) Static pressure forming: Under the condition of pressure of 30MPa, the mixed material in step (2) is stati...

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Abstract

The invention relates to a low-temperature ceramic solidification method for high-arsenic heavy metal sludge, belonging to the technical fields of resource comprehensive utilization and environmental protection. The low-temperature ceramic solidification method comprises the following steps: uniformly mixing the high-arsenic heavy metal sludge, fly ash, lime, gypsum and an activator, then carrying out static pressure molding, carrying out standing, placing an obtained product in an autoclave, and carrying out autoclave curing treatment so as to obtain low-temperature ceramic. According to the invention, sludge, fly ash, lime and the like are adopted as raw materials for preparation of the low-temperature ceramic, so resource utilization of solid wastes is realized; meanwhile, the addition amount of the sludge is high, so the amounts of additives are reduced, and the cost is saved; and the ceramic form by using the method provided by the invention has the characteristics of beautiful product appearance and low toxicity.

Description

technical field [0001] The invention relates to a low-temperature ceramic solidification method for high-arsenic heavy metal sludge, and belongs to the technical field of resource comprehensive utilization and environmental protection. [0002] technical background [0003] With the development of my country's industrial technology and the improvement of people's quality of life, our requirements for the environment are getting higher and higher. It is no longer the era when we only wanted production quantity and ignored environmental pollution. The metallurgical industry has always been considered the industry that pollutes the environment the most. Copper smelting has brought us huge benefits, but the "three wastes" produced in the process have always troubled us. How to deal with the "three wastes" so as to reduce the degree of environmental pollution and achieve "win-win" benefits and the environment is the goal we have been striving for these years. [0004] Most of th...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B18/04
CPCY02W30/91C04B28/14C04B18/0472C04B2111/00017C04B2111/00767C04B2201/50C04B18/08C04B22/064C04B40/024C04B22/08C04B22/124
Inventor 祝星徐媛祁先进王华魏永刚李孔斋胡建杭
Owner KUNMING UNIV OF SCI & TECH
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