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Method for treating nickel-containing wastewater by using recycled kieselguhr

A technology of silicon bath soil and nickel wastewater, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as heavy environmental burden, waste, and affecting smooth production, and achieve shortening Processing time, convenient operation, and the effect of ion exchange capacity

Inactive Publication Date: 2019-02-15
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: Some used diatomite contains a certain amount of oil, and some enterprises use burning methods to dispose of it, which not only causes huge waste, but also brings heavy environmental burdens, and even affects the smooth progress of production, so How to recover this part of oil and regenerate diatomite has broad research prospects and practical significance

Method used

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  • Method for treating nickel-containing wastewater by using recycled kieselguhr
  • Method for treating nickel-containing wastewater by using recycled kieselguhr

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] ① The waste diatomite filter aid used in the aluminum products industry for rolling oil purification and filtration is washed with sulfuric acid to remove oil from the surface, and then saponified with sodium hydroxide at a certain temperature to remove oil in depth, washed, filtered and dried, and recycled Diatomaceous earth can be used.

[0033] ② Mix the silicon bath soil recovered in step ① with ferrous ferrite in a mass ratio of 10:1.

[0034] ③ Add 2 mol / L hydroxide to 20 mL of nickel ion-containing simulated wastewater (0.08 mol / L nickel sulfate aqueous solution) to adjust the pH to about 9, then add 0.5 g of silicon bath soil-ferrous salt composite flocculant for co-precipitation, Air is blown in, stirred for 5 minutes to make it fully react, and after the reaction is completed, filter to complete the treatment of nickel ion-containing wastewater. The content of nickel ions in the solution before and after treatment was determined by spectrophotometry.

[0035...

Embodiment 2

[0040] ① same as embodiment 1

[0041] ② Mix the silica bath soil recovered in step ① with ferrous ferrite in a mass ratio of 5:1.

[0042] ③ Add 2 mol / L hydroxide to 100 mL of simulated wastewater containing nickel ions (0.08 mol / L nickel sulfate aqueous solution) to adjust the pH to about 9, and then add 5 grams of silicon bath soil-ferrous salt composite flocculant for co-precipitation, Air is blown in, stirred for 5 minutes to make it fully react, and after the reaction is completed, filter to complete the treatment of nickel ion-containing wastewater. The content of nickel ions in the solution before and after treatment was determined by spectrophotometry.

[0043] ④-⑦Example 1

Embodiment 3

[0045] ① same as embodiment 1

[0046] ② Mix the silica bath soil recovered in step ① with ferrous ferrite in a mass ratio of 5:1.

[0047] ③In 100mL of simulated wastewater containing nickel ions (0.08mol / L nickel sulfate aqueous solution), add 5.0 grams of silicon bath soil-ferrous salt composite flocculant, then add a certain amount of hydroxide precipitant, blow in air, and stir for 5 minutes to make it Fully react, after the reaction is finished, filter to complete the treatment of nickel ion-containing wastewater. The content of nickel ions in the solution before and after treatment was determined by spectrophotometry.

[0048] ④-⑦Example 1

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Abstract

The invention belongs to the technical field of wastewater treatment, and discloses a method for treating nickel-containing wastewater by using recycled kieselguhr. The method comprises the followingsteps of : S1, preparation of a composite flocculant: uniformly mixing recycled kieselguhr and a ferrous sulfate solid or ferrous sulfate solution in a certain ratio to obtain a kieselguhr-ferrite composite flocculant; and S2, removal of nickel from nickel ion-containing wastewater: adding a hydroxide precipitant and the kieselguhr-ferrite composite flocculant in a certain amount of nickel ion-containing wastewater in sequence, blasting air and carrying out stirring to ensure full reaction, after the reaction is completed, settling the sludge and taking the supernatant liquid as treated wastewater. According to the method, recycled kieselguhr and ferrite are utilized to form the composite flocculant so as to treat the nickel-containing wastewater, so that synergistic recycling of the kieselguhr and the nickel-containing wastewater is achieved, the operation is is green and environmentally friendly, the optimal utilization of resources is fully embodied, the cost is low, the sources arerich, the effect is excellent, and the ferrite can be recovered by subsequent treatment to complete the low-cost oxidation from ferrite to molysite.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for waste water treatment, recycling of oil-containing silicon bath soil and nickel resources. Background technique [0002] With the intensification of heavy metal accumulation in water sources, heavy metal pollution has attracted more and more attention. Treatment and recovery of heavy metals has become a research hotspot in the field of wastewater treatment. The main sources of nickel-containing wastewater are nickel ore mining, nickel alloy smelting, production of nickel-containing compounds, and nickel plating and rinsing processes in the electroplating industry. When nickel ions enter the human body through the biological chain, it may cause tumors and cause the lungs to gradually harden. If nickel-containing wastewater is discharged without treatment, it will not only seriously endanger the natural environment and human health, but also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F101/20
CPCC02F1/5236C02F1/5245C02F1/5263C02F2101/20
Inventor 壮亚峰曹桂萍许鹏乐传俊
Owner CHANGZHOU INST OF TECH
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