Nickel-containing wastewater treatment technology

A treatment process, technology for nickel wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve maintenance, high operating costs, high pressure, adverse effects of membrane life, etc. problem, to achieve the effect of low processing cost

Inactive Publication Date: 2009-11-18
邱致忠
View PDF0 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Including reverse osmosis, membrane extraction, ultrafiltration, etc., because the membrane separation needs to operate normally when the wastewater to be treated reaches a certain index, the suspended solids, organic matter, colloidal substances, etc. in the wastewater are detrimental to the life

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The wastewater sample is an old electroless nickel plating solution with an initial pH=4.5 and the composition is as follows (g / L): Ni 2+ 2-6, Fe 3+ 0.01~0.02, Cu 2+ 0.2~0.6, NH 4 + 70-80, in addition, it also contains 150-200g / L phosphite, 25-50g / L citrate, and organic matter such as lactic acid.

[0028] Under the condition of stirring at room temperature, use ammonia water to adjust PH=5.5, then add dimethylglyoxime to carry out nickel precipitation reaction, dimethylglyoxime and Ni in the filtrate 2+ The molar ratio is 2.2:1, and filtered after 60 minutes of reaction; the filter cake is washed 2 to 3 times with hot water at 40-45°C in countercurrent, and then filtered to obtain pure nickel chelate; the nickel chelate is stirred Add 40% sulfuric acid to precipitate dimethylglyoxime, and obtain nickel sulfate solution and dimethylglyoxime after filtration; then process the acid immersion solution, use activated carbon to absorb and recover dimethylglyoxime, neutra...

Embodiment 2

[0030] The wastewater sample is an old electroless nickel plating solution with an initial pH=4.5 and the composition is as follows (g / L): Ni 2+ 2-6, Fe 3+ 0.01~0.02, Cu 2+ 0.2~0.6, NH 4 + 70-80, in addition, it also contains 150-200g / L phosphite, 25-50g / L citrate, and organic matter such as lactic acid.

[0031] Under the condition of stirring at room temperature, use ammonia water to adjust PH=9.5, then add dimethylglyoxime to carry out nickel precipitation reaction, dimethylglyoxime and Ni in the filtrate 2+ The molar ratio is 2.4:1, and filtered after 20 minutes of reaction; the filter cake is washed 2 to 3 times with hot water at 85-90°C in countercurrent, and then filtered to obtain pure nickel chelate; the nickel chelate is stirred Add 10% sulfuric acid to precipitate dimethylglyoxime, and obtain nickel sulfate solution and dimethylglyoxime after filtration; then process the acid immersion solution, use activated carbon to absorb and recover dimethylglyoxime, neutra...

Embodiment 3

[0033] The wastewater sample is an old electroless nickel plating solution with an initial pH=4.5 and the composition is as follows (g / L): Ni 2+ 2-6, Fe 3+ 0.01~0.02, Cu 2+ 0.2~0.6, NH 4 + 70-80, in addition, it also contains 150-200g / L phosphite, 25-50g / L citrate, and organic matter such as lactic acid.

[0034] Under the condition of stirring at room temperature, use ammonia water to adjust PH=7.0, then add dimethylglyoxime to carry out nickel precipitation reaction, dimethylglyoxime and Ni in the filtrate 2+The molar ratio is 2.3:1, filtered after reacting for 30 minutes; the filter cake was washed 2 to 3 times with hot water at 80-90°C countercurrently, and then filtered to obtain pure nickel chelate; the nickel chelate was stirred Add 25% sulfuric acid to precipitate dimethylglyoxime, and obtain nickel sulfate solution and dimethylglyoxime after filtration; then process the acid immersion solution, use activated carbon to absorb and recover dimethylglyoxime, neutr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses nickel-containing wastewater treatment technology, which comprises the following steps: using sodium hydroxide or ammonia water to adjust the pH value of nickel-containing wastewater to between 5.5 and 9.5; adding dimethylglyoxime into the nickel-containing wastewater under the stirring at normal temperature for a nickel deposition reaction, wherein the molar ratio of the dimethylglyoxime to Ni in a filtrate is 2.2:1-2.4: 1; filtering after the reaction is performed for 20 to 60 minutes; washing a filter cake by hot water with a temperature between 40 and 90 DEG C, and then obtaining a pure nickel chelate through the filtration; using hydrochloric acid, sulfuric acid or nitric acid to dissolve the nickel chelate according to product requirements; and obtaining corresponding nickel salt solution and the dimethylglyoxime after the filtration; recovering the dimethylglyoxime from an acid-dissolved filtrate; removing residual Fe through neutralization; heating hydrolysis and filtration, and then evaporating, washing, crystallizing the filtrate and drying the crystal to obtain a product; merging the filtrates in step two and recovering the dimethylglyoxime; and using the recovered dimethylglyoxime for the nickel deposition reaction. The nickel-containing wastewater treatment technology can ensure that the nickel-containing wastewater reaches the standard after the treatment and the content of the residual Ni is less than 1mg/L, can also completely recover nickel, and has low treatment cost and less equipment investment.

Description

technical field [0001] The invention relates to a process for treating nickel-containing wastewater. Background technique [0002] Although nickel and its salts have low toxicity, as an element with biological effects, nickel can activate or inhibit a series of enzymes (such as arginase, carboxylase, etc.) to cause its toxic effects. Animals eating nickel salt can cause stomatitis, gingivitis and acute gastroenteritis, and damage the heart muscle and liver. Experiments have shown that the lethal dose of nickel to rabbits is 7-8 mg / kg. Nickel and its compounds can irritate human skin, mucous membranes and respiratory tract, and can cause dermatitis, bronchitis, and even pneumonia. It has been proved by animal experiments and crowd observation that nickel has a accumulation effect, and the accumulation is the most in the kidney, spleen, and liver, which can induce nasopharyngeal cancer and lung cancer. At the same time, nickel also has adverse effects on plant growth (the cr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/04
Inventor 邱致忠
Owner 邱致忠
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap