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Application method of amino/hydroxy-containing crystalline hydrate minerals in nickel-containing wastewater treatment

An application method, amino-containing technology, applied in the field of wastewater treatment, can solve the problems of small amount of sediment, difficult sedimentation, unsatisfactory treatment effect, etc.

Active Publication Date: 2016-06-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soda lime (CaO), slaked lime (Ca(OH) 2 ) and other neutralizers, which are cheap; or add caustic soda, which is easy to add and can quickly remove nickel ions in wastewater. Small, slow sedimentation rate, high water content
In particular, nickel hydroxide is in the form of flocculation in the solution, the precipitated particles are very small, it is difficult to precipitate in the liquid phase, and there are different forms of hydroxyl complex ions (such as Ni(OH) + , Ni(OH) 4 2- , Ni(OH) 3 - ), making it more difficult to treat nickel-containing wastewater only in the form of nickel hydroxide precipitation, especially for low-concentration (1-20mg / L) nickel-containing wastewater, because it is difficult to form nickel hydroxide precipitation particles, the treatment effect is even more unsatisfactory

Method used

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  • Application method of amino/hydroxy-containing crystalline hydrate minerals in nickel-containing wastewater treatment
  • Application method of amino/hydroxy-containing crystalline hydrate minerals in nickel-containing wastewater treatment
  • Application method of amino/hydroxy-containing crystalline hydrate minerals in nickel-containing wastewater treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Prepare 3L of ammonium chloride solution of 2g / L (N meter), according to n (NH 4 Cl):n(MgCl 2 ):n(Na 2 HPO 4 )=2:1:1 molar ratio Weigh quantitative magnesium chloride and disodium hydrogen phosphate solid, then prepare 1mol / L NaOH solution. Under the condition of keeping stirring, magnesium chloride and disodium hydrogen phosphate solid were added to the prepared ammonium chloride solution, according to the ratio v(NaOH):v(NH 4 Cl)=0.0325:1, measure 97.5 mL of NaOH solution, and quickly put the measured NaOH solution into the system after adding magnesium chloride and disodium hydrogen phosphate. The stirring speed was adjusted to 500r / min, and the stirring time was controlled to 30min. After solid-liquid separation, the precipitate was taken out and dried, and the drying temperature was controlled at 50°C. After drying for 2 hours, the amino group (-NH 3 ) and hydroxyl (-OH) crystalline hydrated minerals.

Embodiment 2

[0029] Measure the amino group (-NH) synthesized in embodiment 1 3 ) and hydroxyl (-OH) crystalline hydrated minerals have 6 crystal water molecules, and the average mineral density is 1.8g / cm 3 , the nitrogen content is 5.71%, the hydrogen content is 6.5%, and the oxygen content is 65.3%. After 30 minutes of reaction, the average particle size of the crystalline hydrated mineral is 30.2 μm, and the zeta potential is -2.6mV. The infrared spectrum of the mineral surface shows that Contains the indicated amino group (-NH 3 ), hydroxyl (-OH) peaks ( figure 1 ).

Embodiment 3

[0031] Take 1L of nickel-containing wastewater with a nickel concentration of 50mg / L, and add caustic soda to the wastewater under stirring to increase the pH of the system to 9.0, so that the nickel ions undergo hydrolysis reaction, and the hydrolysis reaction time is 1min. Then, the crystalline hydrated mineral containing amino and hydroxyl groups obtained in Example 1 was added to the solid-liquid mixed system after the hydrolysis reaction, and the mass ratio of the dosage to the nickel in the waste water was 3:1. Then mix and stir for 20min. The obtained solid-liquid system was subjected to solid-liquid separation, and the nickel content in the supernatant was measured to be 0.04 mg / L, which had reached the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002). The precipitation was detected by a particle size analyzer, and the average particle size reached 32.8 μm. As a comparison, the wastewater sample was treated by the traditional alkali-addi...

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Abstract

The invention discloses an application method of amino / hydroxy-containing crystalline hydrate minerals in nickel-containing wastewater treatment. The crystalline hydrate mineral surface contains rich amino, hydroxy and other groups, is negatively charged, and can easily generate interface actions with nickelous hydroxide in wastewater to coprecipitate, thereby increasing the particle size of the precipitate particles, and further achieving the goal of quickly precipitating nickelous hydroxide in the wastewater treatment system. The application method in nickel-containing wastewater treatment is carried out according to the hydrolysis-mixing-solid-liquid separation process; the pH value of the system is regulated to 9.0-10.0 in the hydrolysis process; and in the mixing process, the amino-containing crystalline hydrate mineral preparation is added according to the mineral / nickel mass ratio of (0.5-4.0):1.0. The method can obviously enhance the precipitation performance of the nickelous hydroxide in the water treatment process, and the nickel-containing concentration in the effluent water can satisfy the national discharge standard.

Description

technical field [0001] The invention relates to an application method of crystalline hydrated minerals containing amino groups and hydroxyl groups in the treatment of nickel-containing wastewater, in particular to the treatment of the minerals in the nickel-containing wastewater produced by mining, beneficiation, smelting, processing and electronic industry in the non-ferrous industry. Wastewater treatment field. Background technique [0002] Nickel is widely used in the electroplating industry and is an indispensable process link in the electroplating industry. The electroplating industry produces a large amount of nickel-containing wastewater. Nickel wastewater contains nickel metal ions that are extremely harmful to the human body. The environment is seriously polluted. The methods for treating nickel-containing wastewater can be classified into three categories: chemical methods, physical chemical methods, and biological methods. Among them, chemical methods include ne...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F9/04B01J20/02B01J20/30
CPCB01J20/02C02F1/281C02F1/52C02F1/66C02F9/00
Inventor 唐崇俭彭聪柴立元闵小波宋雨夏王海鹰刘恢
Owner CENT SOUTH UNIV