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Method for purifying sewage containing heavy metal by utilizing calcium metasilicate and recycling heavy metal

A calcium silicate, heavy metal technology, applied in chemical instruments and methods, silicon compounds, non-metallic elements, etc., can solve problems such as low maturity, pollutants, and increase the removal effect of heavy metal ions

Inactive Publication Date: 2014-09-03
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Micellar-enhanced ultrafiltration method adds surfactants to wastewater to form micelles to increase the removal effect of heavy metal ions, but the introduced surfactants are easy to form new pollutants
The polymer complex ultrafiltration method complexes heavy metal ions by adding macromolecular complexing agents to wastewater, and then ultrafiltration removes macromolecules, and the maturity is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ni(NO) was dissolved in deionized water 3 ) 2 ·6H 2 O (analytical pure) to prepare Ni(NO 3 ) 2 Pure solution, and then use the solution to prepare 100ml of concentration of 200, 400, 600, 800, 900, 1000mg / l each, add 0.100g of calcium silicate powder to each of them, stir magnetically, react for 4h to sample, and use dimethylglyoxime to spectrometer Photometric method (GB11910-89) is used to test nickel ions in water, and the solution with a concentration of 200mg / l cannot detect the presence of nickel ions after treatment. For the original concentration of nickel ions of 400, 600, 800, 900, 1000 mg / l, the measured equilibrium adsorption capacity is 383.17, 402.04, 416.56, 399.36, 421.46 mg / g respectively, and the nickel ion concentrations in the treated water are 16.83, 197.96, 383.14, 500.64 mg / l. Calculated by the adsorption isotherm, the saturated adsorption capacity of calcium silicate micropowder to nickel ion is 423mg / g.

Embodiment 2

[0023] Zn(NO) was dissolved in deionized water 3 ) 2 ·6H 2 O (analytical pure) to prepare Zn(NO) with zinc ion concentration of 1000mg / L 3 ) 2 Pure solution, and then use the solution to prepare 100ml of concentration of 100, 200, 400, 600, 800, 1000mg / l each, add 0.050g of calcium silicate powder to each of them, stir magnetically, react for 1h and take a sample, test at this time C(Zn 2+ ), and then re-prepared 100ml of different concentrations of stock solutions, and reacted for 2h to sample and test C (Zn 2+ ), and so on, test the concentration of zinc ions after 1, 2, 3, 4, 5, and 6 hours of reaction respectively, calculate the equilibrium adsorption amount of the powder to different concentrations of stock solution, and make the adsorption isotherm to obtain the concentration of calcium silicate powder on zinc ions The saturated adsorption capacity is 246mg / g.

Embodiment 3

[0025] Dissolve CoCl in deionized water 2 ·6H 2 O (analytical pure) to prepare CoCl with a copper ion concentration of 1000mg / L 2 Pure solution, and then use the solution to prepare 100ml of concentration of 100, 200, 300, 400, 500, 600, 700mg / L each, add 0.10g of calcium silicate powder to each, stir magnetically, react for 1h and take a sample, test at this time C (Co 2+ ), and then re-prepared 100ml of stock solutions of different concentrations, and reacted for 2h to sample and test C (Co 2+ ), and so on, respectively test the concentration of cobalt ions after 1, 2, 3, 4, 5, and 6 hours of reaction, calculate the equilibrium adsorption amount of the powder to different concentrations of stock solution, and do the adsorption isotherm to obtain the concentration of calcium silicate powder on cobalt ions The saturated adsorption capacity is 229mg / g.

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Abstract

The invention provides a low-cost and effective method for enrichment of heavy metal ions and purification of water quality. The method comprises the following steps of A) fully contacting the heavy metal sewage and calcium metasilicate micropowder; B) separating the calcium metasilicate micro-powder enriched with the heavy metal from water; C) recycling the heavy metal in the calcium metasilicate micropowder enriched with the heavy metal, wherein the molar ratio of calcium to silicon in the calcium metasilicate micro-powder is 0.9 to 1.1. The full contact method is a clearance reactor adsorption method or a fixed bed adsorption method. The calcium metasilicate micro-powder enriched with the heavy metal is converted into silicate with heavy metal by calcium metasilicate, and the steps A) and B) are carried out at constant temperature.

Description

field of invention [0001] The invention belongs to the field of environmental protection and provides a method for purifying sewage containing heavy metals by using cheap raw materials and recovering heavy metals. Background technique [0002] Sewage containing heavy metals poses a great threat to environmental safety and human health. At present, the main methods for purifying sewage containing heavy metals include chemical precipitation, adsorption, ion exchange, micellar enhanced ultrafiltration, and polymer complex ultrafiltration. and electrochemical methods. Chemical precipitation methods include neutralization precipitation method, sulfide precipitation method and barium salt precipitation method. The most commonly used method is neutralization precipitation method. By adjusting the pH value of sewage to alkaline, adding precipitant to precipitate heavy metal ions. Adsorption methods often use activated carbon, zeolite, clay and other adsorbents to adsorb heavy metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62B01J20/10
Inventor 秦国彤王淑丽
Owner BEIHANG UNIV
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