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Composite ceramic, preparation method and application in selenium extraction

A technology of composite ceramics and porous ceramics, applied in the field of ceramic materials, can solve the problems of low separation efficiency of low-concentration selenium, limited application, slow processing speed, etc., to promote environment-friendly and resource-saving, and improve resource utilization. , improve the effect of environmental problems

Inactive Publication Date: 2019-10-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high recovery rate, electrolysis is a common commercial process, but there are disadvantages such as high energy efficiency, low purity and large pollution
Bioseparation has the advantages of environmental protection and low energy consumption, but it has strict temperature requirements and slow processing speed, which limits its industrial application
The redox method has a good separation effect for high concentrations of selenium, but the separation efficiency for low concentrations of selenium is low

Method used

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  • Composite ceramic, preparation method and application in selenium extraction
  • Composite ceramic, preparation method and application in selenium extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of composite ceramics, comprising the steps of:

[0036] a) Collect ordinary red bricks, mechanically crush, grind and sieve them to obtain brick slag powder. Immerse 5g of brick slag powder into 100mL of hydrochloric acid solution with a concentration of 0.1mol / L, let it stand for 3h, repeat the immersion for 5 times, then filter with suction, then wash with distilled water until neutral, and then wash with ethanol twice. Finally, the brick slag powder obtained by suction filtration was dried at 80° C. for 12 hours to obtain a pretreated ceramic material.

[0037] b) Add 5g of the pretreated ceramic material to 100mL of aluminum sol with an aluminum concentration of 0.4mol / L, let it stand for 1 hour, filter it with suction, dry it at 80°C for 4 hours, then calcinate it at 500°C for 5 hours, repeat the above impregnation-pumping Filtration-drying-calcination was performed four times to obtain an aluminum-modified ceramic material.

[0038] c) Prep...

Embodiment 2

[0042] A preparation method of composite ceramics, comprising the steps of:

[0043] a) Collect ordinary hollow bricks, mechanically crush, grind and sieve them to obtain brick slag powder. Immerse 5g of brick slag powder into 100mL of hydrochloric acid solution with a concentration of 0.1mol / L, let it stand for 4h, repeat the immersion for 5 times, then filter with suction, then wash with distilled water until neutral, and then wash with ethanol twice. Finally, the brick slag powder obtained by suction filtration was dried at 80° C. for 12 hours to obtain a pretreated ceramic material.

[0044] b) Add 5g of the pretreated ceramic material to 100mL of aluminum sol with an aluminum concentration of 0.4mol / L, let it stand for 1 hour, filter it with suction, dry it at 80°C for 4 hours, then calcinate it at 500°C for 5 hours, repeat the above impregnation-pumping Filtration-drying-calcination was performed four times to obtain an aluminum-modified ceramic material.

[0045] c) P...

Embodiment 3

[0049] A preparation method of composite ceramics, comprising the steps of:

[0050] a) Collect ordinary hollow bricks and mixed red bricks, mechanically pulverize, grind and sieve them to obtain brick slag powder. Immerse 5g of brick slag powder into 100mL of hydrochloric acid solution with a concentration of 0.1mol / L, let it stand for 5h, repeat the immersion 8 times, then filter with suction, then wash with distilled water until neutral, and then wash with ethanol twice. Finally, the brick slag powder obtained by suction filtration was dried at 80° C. for 12 hours to obtain a pretreated ceramic material.

[0051] b) Add 5g of the pretreated ceramic material to 100mL of aluminum sol with an aluminum concentration of 0.4mol / L, let it stand for 1 hour, filter it with suction, dry it at 80°C for 4 hours, then calcinate it at 500°C for 5 hours, repeat the above impregnation-pumping Filtration-drying-calcination was performed four times to obtain an aluminum-modified ceramic mat...

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Abstract

The invention belongs to the technical field of ceramic materials and relates to a composite ceramic, in particular to a composite ceramic, a preparation method and application in selenium extraction.The composite ceramic adopts a porous ceramic as a carrier, porous alumina and low-valent copper are adopted as active components and loaded on the surface of the porous ceramic, and the composite ceramic has adsorption and reduction effects on selenite radicals. Waste solid buildings and brick slag are adopted as raw materials, new resources are created through pore forming, surface functionalization, crystal growth and secondary utilization of construction waste, and convenience is provided for solving the environmental problem of the construction waste and promoting the establishment and development of an environment-friendly and resource-saving society. A preparation technology is controllable, low in cost and environmentally friendly. A prepared composite ceramic material has a richpore structure, a large specific surface area, high surface reactivity and adsorption capacity and an important application value in the field of separation of porous ceramic materials and rare elements. The composite ceramic has the advantages of high separation efficiency, low cost and energy-saving and environment-friendly effect.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and relates to composite ceramics, in particular to a composite ceramic, a preparation method and an application for selenium extraction. Background technique [0002] In nature, selenium has two sides, and its role and influence on organisms is huge. An appropriate concentration of selenium has the effect of scavenging oxides and free radicals, and plays an important role in improving immunity, delaying aging and improving health. At the same time, selenium plays an important role in preventing viruses and cardiovascular and cerebrovascular diseases; however, excessive selenium concentration in the environment will lead to selenium imbalance in organisms, thereby endangering life and health. For example, high concentrations of selenium affect the growth and development of crops, reduce yield, Cause abnormal development and even death of animal embryos. In addition, selenium is the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B41/85C04B33/132B01J20/08B01J20/28B01J20/30
CPCB01J20/0237B01J20/06B01J20/08B01J20/28054B01J20/28061C04B33/132C04B38/0025C04B38/0045C04B41/009C04B41/5127C04B41/85C04B41/5072C04B41/5031Y02P40/60
Inventor 吴杰义张涛邱智伟周豪岳学杰徐吉成邱凤仙
Owner JIANGSU UNIV
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