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Tobermorite/ HAP composite sewage heavy-metal treating material and preparation method thereof

A tobermorite and heavy metal technology is applied in the field of tobermorite/HAP composite sewage heavy metal treatment material and its preparation, which can solve problems such as difficulty in sludge disposal and excess metal concentration, and achieve good application prospects and production costs. The effect of low, strong adsorption capacity

Inactive Publication Date: 2014-12-24
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Heavy metal ion wastewater is mostly treated by the traditional chemical precipitation method, but the presence of ligands in the wastewater affects the precipitation of metal hydroxides, which may lead to excessive concentrations of remaining metals, and the presence of metal hydroxide precipitation makes sludge disposal more difficult. difficulty

Method used

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  • Tobermorite/ HAP composite sewage heavy-metal treating material and preparation method thereof
  • Tobermorite/ HAP composite sewage heavy-metal treating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Design the composite ratio of tobermorite and HAP according to the molar ratio of 7:3; determine the molar amount n1(Si) of Si in tobermorite according to the molar ratio of n1(Ca) / n1(Si)=5 / 6 , and then determine the molar mass n1(Ca) of Ca in tobermanite; then determine the molar mass n2(P) of P in HAP according to the molar ratio of n2(Ca) / n2(P)=1.67, and then determine the molar mass n2(P) of HAP The molar weight n2(Ca) of Ca in the middle; Finally determine the total molar weight n(Ca) of Ca by n(Ca)=n1(Ca)+n2(Ca);

[0028] 2) According to the ratio of the molar amount n1(Si) of Si in tobermorite, the molar amount n2(P) of P in HAP and the total molar amount n(Ca) of Ca determined in step 1), weigh the analytically pure Ca respectively. (OH) 2 , Analytical pure Na 2 SiO 3 9H2 O and measure the phosphoric acid aqueous solution acid that the concentration that prepares is 0.5mol / L; The analysis pure Ca(OH) 2 and analytically pure Na 2 SiO 3 9H 2 O is fully m...

Embodiment 2

[0034] 1) Design the composite ratio of tobermorite and HAP according to the molar ratio of 8:2, and determine the molar amount n1(Si) of Si in tobermorite according to the molar ratio of n1(Ca) / n1(Si)=5 / 6 , and then determine the molar mass n1(Ca) of Ca in tobermanite; then determine the molar mass n2(P) of P in HAP according to the molar ratio of n2(Ca) / n2(P)=1.67, and then determine the molar mass n2(P) of HAP The molar weight n2(Ca) of Ca in the middle; Finally determine the total molar weight n(Ca) of Ca by n(Ca)=n1(Ca)+n2(Ca);

[0035] 2) According to the ratio of the molar amount n1(Si) of Si in tobermorite, the molar amount n2(P) of P in HAP and the total molar amount n(Ca) of Ca determined in step 1), weigh the analytically pure Ca respectively. (OH) 2 , Analytical pure Na 2 SiO 3 9H 2 O and measure the phosphoric acid aqueous solution acid that the concentration that prepares is 0.5mol / L; The analysis pure Ca(OH) 2 and analytically pure Na 2 SiO 3 9H 2 O is f...

Embodiment 3

[0038] 1) Design the composite ratio of tobermorite and HAP according to the molar ratio of 9:1, and determine the molar amount n1(Si) of Si in the tobermorite according to the molar ratio of n1(Ca) / n1(Si)=5 / 6 , and then determine the molar mass n1(Ca) of Ca in tobermanite; then determine the molar mass n2(P) of P in HAP according to the molar ratio of n2(Ca) / n2(P)=1.67, and then determine the molar mass n2(P) of HAP The molar weight n2(Ca) of Ca in the middle; Finally determine the total molar weight n(Ca) of Ca by n(Ca)=n1(Ca)+n2(Ca);

[0039] 2) According to the ratio of the molar amount n1(Si) of Si in tobermorite, the molar amount n2(P) of P in HAP and the total molar amount n(Ca) of Ca determined in step 1), weigh the analytically pure Ca respectively. (OH) 2 , Analytical pure Na 2 SiO 3 9H 2 O and measure the phosphoric acid aqueous solution acid that the concentration that prepares is 0.5mol / L; The analysis pure Ca(OH) 2 and analytically pure Na 2 SiO 3 9H 2 O ...

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Abstract

The invention relates to a tobermorite / HAP composite sewage heavy-metal treating material and a preparation method thereof. Firstly, Ca(OH)2 is utilized as a symbiotic calcium source for tobermorite and HAP, Na2SiO3 9H2O is utilized as a silicon source to generate the tobermorite, phosphoric acid is utilized as a phosphorus source to generate the HAP, and a tobermorite / HAP composite precursor is prepared by utilization of an ultrasonic copolymerization method. Then the precursor is placed in a hydrothermal reactor and reacted at 180-200 DEG C for 16-20 h to perform hydrothermal symbiotic synthesis, and the well-crystallized tobermorite / HAP composite sewage heavy-metal treating material is finally prepared. The material comprises the tobermorite and the HAP in a molar ratio of (10-X):X, and the X is 1-4. Test results show that the product prepared by the method has good crystallization status, no impurity phase, and high purity. The stumpy HAP is distributed in a netty tobermorite skeleton to form a mesoporous composite material having the high specific surface area.

Description

technical field [0001] The invention belongs to the field of ecological environment materials, and in particular relates to a tobermorite / HAP composite sewage heavy metal treatment material and a preparation method thereof. Background technique [0002] With the rapid development of industrial globalization, the problem of environmental pollution is becoming more and more serious. For example, the cadmium rice incident reported by the media in May 2013 and the water pollution incident in the Huaihe River Basin led to the emergence of cancer villages, which sounded the alarm for people. Therefore, in my country, environmental pollution, especially heavy metal pollution, has become an urgent problem to be solved for scientific development and improvement of people's livelihood. [0003] Generally speaking, heavy metal pollution in water mainly comes from industries such as industrial mining and factory wastewater discharge. At present, the treatment methods for heavy metals ...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F1/42C02F101/20
Inventor 张超武缪金良徐彬时春辉王芬解莎莎
Owner SHAANXI UNIV OF SCI & TECH
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