Inorganic composite material for absorbent refining multiple metal ion industrial sewage and application method thereof

An inorganic composite material and industrial wastewater technology, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of high investment costs, secondary pollution, and high operating costs of membrane equipment, and achieve excellent adsorption characteristics, no secondary pollution, good purification effect

Active Publication Date: 2012-09-12
陕西合兴硅砂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The precipitation method removes metal ions based on the solubility product principle, but it is difficult for low-concentration metal ions to reach the concentration required to form a solubility product. At this time, it is necessary to add an organic or inorganic precipitation carrier for coprecipitation, resulting in an increase in cost and the formation of a precipitate. It will cause secondary pollution; the membrane separation method has the advantages of energy saving, no phase change, good separation effect, simple equipment, convenient operation, and no secondary pollution. However, the investment cost of membrane equipment is high, and the complexity of actual wastewater will bring membrane Contamination, resulting in a decrease in membrane flux, requires regular cleaning of the membrane, resulting in high operating costs; biological methods can selectively adsorb metal ions, with high treatment efficiency, low operating costs, and no secondary pollution, but the use of biosorbents needs to be based on Waste water quality, domestication of bacterial strains, most strains have strict requirements on pH and temperature, the complexity of actual wastewater is likely to poison the strains, and it is very difficult to screen and cultivate high-efficiency bacteria

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 6 mL of concentrated sulfuric acid, 1 mL of concentrated nitric acid and 0.3 g of potassium dichromate to 5 g of graphite powder to react and oxidize for 18 hours, add clean water to wash until it is neutral, filter, and dry at 105°C to obtain expanded graphite. Soaking in titania sol for 20 min, the intercalated expanded graphite is obtained; the preparation method of hydroxyapatite is to add 0.5 mol / L Ca(NO 3 ) 2 0.3 mol / L equal volume of (NH 4 ) 3 PO 4 After the dripping is completed, adjust the pH of the solution to 6 with ammonia water, then place it in a water bath at 80℃ for 6h, then age for 20h, filter by suction, then dry at 70℃ for 2h and then grind it; Zeolite is dried after drying After grinding and sieving to 75μm, oxidize with 1.5% (mass fraction) hydrochloric acid, stir for 1.5h, then rinse with water to neutrality, filter and dry for later use; limestone is sieved to 75μm after grinding , Placed in a muffle furnace at 400 ℃, roasted and activated for 1...

Embodiment 2

[0033] Add 7 mL of concentrated sulfuric acid, 1.5 mL of concentrated nitric acid and 0.4g of potassium dichromate to 6g of graphite powder for 19h oxidation reaction, add deionized water to wash to neutrality, filter, and dry at 105°C to obtain expanded graphite, and then expand Graphite is immersed in titania sol for 25 min, and then intercalated expanded graphite is obtained; the preparation method of hydroxyapatite is to add 1.0 mol / L Ca(NO 3 ) 2 Add 0.6 mol / L equal volume of (NH 4 ) 3 PO 4 After the dripping is completed, adjust the pH of the solution to 7 with ammonia water, then place it in a water bath at 85°C for 7h, then age for 21h, filter by suction, then dry at 70°C for 2h and then be ground; Zeolite is dried after drying It is sieved and classified to 50 μm, oxidized with 1.8% (mass fraction) hydrochloric acid, stirred for 1.5h, then rinsed with water until it is neutral, filtered, and dried for later use; limestone is ground, sieved and classified to 50 μm, calcin...

Embodiment 3

[0038] Add 8 mL of concentrated sulfuric acid, 2 mL of concentrated nitric acid and 0.5 g of potassium dichromate to 7 g of graphite powder for 21h oxidation reaction, add deionized water to wash to neutrality, filter, and dry at 105 ℃ to obtain expanded graphite, and then expand The graphite is immersed in the titanium dioxide sol for 30 min, and then the intercalated expanded graphite is obtained; the preparation method of hydroxyapatite is to add 1.5 mol / L Ca(NO 3 ) 2 Add 0.9 mol / L equal volume of (NH 4 ) 3 PO 4 After the addition is complete, adjust the pH of the solution to 8 with ammonia water, then place it in a water bath at 90℃ for 8h, then age for 22h, filter by suction, then dry at 70℃ for 2h and then be ground; Zeolite is dried after drying It was sieved and classified to 40 μm, oxidized with 2.0% (mass fraction) of hydrochloric acid, stirred for 1.5h, then rinsed with water to neutral, filtered, and dried for later use; limestone was sieved and classified to 40 μm, ...

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Abstract

The invention provides an inorganic composite material for absorbent refining multiple metal ion industrial sewage. The inorganic composite material is prepared by mixing, by percentage by weight, 5-15% of intercalation expandable graphite, 10-25% of hydroxyapatite, 5-15% of zeolite, 5-10% of rectorite, 5-10% of chalk, 5-25% of bentonite and 15-40% of kieselguhr, adding 5wt% of clear water of total mass of mixture and 5wt% of sodium carboxymethylcellulose, evenly mixing to prepare spheroidal particle with the grain size of 1-3mm, and roasting for 2h at the temperature of 200-800 DEG C after drying. The inorganic composite material is apt to obtain technique materials and simple in handling process, and is used for absorbent refining of the multiple metal ion industrial sewage.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an inorganic composite material used for adsorption and purification of polymetallic ion industrial wastewater and an application method thereof. Background technique [0002] With the emergence of the world's water crisis, the problem of water pollution in my country has become increasingly prominent. The discharge of industrial wastewater is large, and the pollution of heavy metals has become increasingly serious. Therefore, the effective removal of heavy metals in wastewater has become an urgent task. At present, there are good removal technologies for wastewater with conventional metal ions, but not all of them are suitable for wastewater with low concentration of metal ions. The precipitation method removes metal ions based on the solubility product principle, but it is difficult for low-concentration metal ions to reach the concentration requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 雷绍民王欢郭振华裴振宇张世春王恩文张凤凯
Owner 陕西合兴硅砂有限公司
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