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Cement-based material for immobilization of heavy metal ions in waste and method of use thereof

A technology of cement-based materials and heavy metal ions, which is applied in the field of cement-based materials, can solve the problems of wide sources of waste, complex components, harmful to the environment and human health, etc., and achieves the effects of broad market prospects, low cost, and convenient construction.

Inactive Publication Date: 2015-10-28
建研建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the wide source of waste, complex composition, and may contain a variety of substances harmful to the environment and human health, the more typical heavy metal ions (Pb, Cr 6+ , Hg, Cd), leaching toxic substances, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Weigh the raw materials of cement-based materials used for solidification of heavy metal ions in waste according to the following weight: (kg)

[0024] Water-quenched blast furnace slag 0.4; Portland cement 0.2; Zeolite powder 0.1; Light-burned magnesium oxide 0.05; Alunite 0.1; Slaked lime powder (calcium hydroxide) 0.05.

[0025] The water-quenched blast furnace slag is ground until the Blaine specific surface area is 350m2 / kg, the fineness of the zeolite powder is 150 mesh, and the fineness of the light-burned magnesia and alunite is 200 mesh;

[0026] (2) Cement-based materials for solidification of heavy metal ions in waste:

[0027] Put 0.4kg of water-quenched blast furnace slag, 0.2kg of Portland cement, 0.1kg of zeolite powder, 0.05kg of light-burned magnesium oxide, 0.1kg of alunite and 0.05kg of dry lime powder (calcium hydroxide) into the mixer for mixing , mix well, seal and store, and form a powdery cement-based material for solidification of heavy met...

Embodiment 2

[0032] (1) Weigh the raw materials of cement-based materials used for solidification of heavy metal ions in waste according to the following weight: (kg)

[0033] Water-quenched blast furnace slag 0.35; Portland cement 0.15; Zeolite powder 0.15; Light-burned magnesium oxide 0.1; Alunite 0.12; Potassium hydroxide 0.05.

[0034] The water-quenched blast furnace slag is ground until the Blaine specific surface area is 500m2 / kg, the fineness of the zeolite powder is 180 mesh, and the fineness of the light-burned magnesia and alunite is 220 mesh;

[0035] (2) Cement-based materials for solidification of heavy metal ions in waste:

[0036] Put 0.35kg of water-quenched blast furnace slag, 0.15kg of Portland cement, 0.15kg of zeolite powder, 0.1kg of light-burned magnesium oxide, 0.12kg of alunite and 0.05kg of potassium hydroxide into a mixer for mixing. Sealed and stored, forming a powdery cement-based material for the solidification of heavy metal ions in waste;

[0037] (3) Prep...

Embodiment 3

[0041] (1) Weigh the raw materials of cement-based materials used for solidification of heavy metal ions in waste according to the following weight: (kg)

[0042] Water-quenched blast furnace slag 0.35; Portland cement 0.1; Zeolite powder 0.2; Light-burned magnesia 0.05; Alunite 0.15; Sodium hydroxide 0.03.

[0043] The water-quenched blast furnace slag is ground until the Blaine specific surface area is 700m2 / kg, the fineness of the zeolite powder is 160 mesh, and the fineness of the light-burned magnesia and alunite is 210 mesh;

[0044] (2) Cement-based materials for solidification of heavy metal ions in waste:

[0045] Put 0.35kg of water-quenched blast furnace slag, 0.1kg of Portland cement, 0.2kg of zeolite powder, 0.05kg of light-burned magnesium oxide, 0.15kg of alunite and 0.03kg of sodium hydroxide into a mixer for mixing. Sealed and stored, forming a powdery cement-based material for the solidification of heavy metal ions in waste;

[0046] (3) Preparation of ceme...

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Abstract

The invention provides a cement-based material for immobilizing heavy metal ions in waste and a using method of the cement-based material. The cement-based material consists of the following components in parts by weight: 3 to 4 parts of ground water-granulated blast furnace slag, 1 to 2 parts of silicate cement, 1 to 2 parts of zeolite powder, 0.5 to 1 part of undercalcined magnesia, 1 to 1.5 parts of alunite and 0.3 to 0.5 part of hydroxide of alkali metal or alkaline-earth metal. The using method comprises a step of doping the cement-based material in an amount which is 20 to 40 percent based on the dry weight of the waste. According to the cement-based material, an immobilized body of heavy metal-containing solid waste is high in strength and high in volume stability; the cement-based material has the advantage of rapidly and efficiently immobilizing heavy metals, and the leaching concentration of the heavy metals can be remarkably reduced; in addition, the cement-based material is convenient to batch, dangerous heavy metal waste can be turned into a safe and environment-friendly building material, the heavy metal-containing solid waste which cannot be resourcefully utilized at prevent can be recycled, and environmental protection is facilitated.

Description

technical field [0001] The invention relates to a cement-based material used for solidifying heavy metal ions in waste and a method for using the same, and belongs to the technical field of cement-based materials and methods for using the same. Background technique [0002] my country produces billions of tons of waste every year, including industrial waste, construction waste, and urban waste. However, due to the wide source of waste, complex composition, and may contain a variety of substances harmful to the environment and human health, the more typical heavy metal ions (Pb, Cr 6+ , Hg, Cd), leaching toxic substances, etc. These substances will have a negative impact on human health, serious carcinogenic, teratogenic. And concrete is widely used in human settlements. The production and application of concrete must first ensure that it has reliable environmental safety, that is, it will not cause harm to the environment and human health. This is not only the requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08
Inventor 周永祥王晶何更新王伟赵霄龙王永海
Owner 建研建材有限公司