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Method for removing heavy metal ions from waste water and solidifying and recycling

The technology of a heavy metal ion and a recovery method is applied in the field of solidifying agent recovery of heavy metal ions, which can solve problems such as poor recovery effect, and achieve the effects of abundant raw materials, improved efficiency and cost saving.

Active Publication Date: 2013-11-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the electrochemical method used to recover heavy metal ions has certain requirements for the content of heavy metal ions in wastewater, and the recovery effect is not good for low concentrations. However, through this process, the elution after adsorption and saturation of montmorillonite is all high concentrations. solution, the recovery effect is better by electrochemical method

Method used

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  • Method for removing heavy metal ions from waste water and solidifying and recycling
  • Method for removing heavy metal ions from waste water and solidifying and recycling
  • Method for removing heavy metal ions from waste water and solidifying and recycling

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1 Preparation of titanium pillared montmorillonite

[0033] Using pure sodium-based montmorillonite (Zhejiang Sanding Technology Co., Ltd.) as raw material, butyl phthalate, titanium isopropoxide and titanium tetrachloride as titanium sources, the above-mentioned titanium sources were prepared to form a titanium-based pillar liquid, and then used The hydrolysis method hydrolyzes the titanium-based pillared solution into titanium oxide, and pillars it into the montmorillonite layer, and then washes, filters, dries and calcines to obtain the titanium pillared montmorillonite, specifically: (1) Take 1ml of phthalein Butyl acid was slowly added dropwise to 3ml of absolute ethanol to obtain solution A; 3.5ml of 1mol / L nitric acid solution was mixed with 2.5ml of absolute ethanol to obtain solution B. Under vigorous stirring conditions, solution A was added dropwise into solution B, continue to stir for 0.5h after the dropwise addition, and obtain a clear and trans...

Embodiment 2

[0038] (1) if figure 1 and figure 2 The adsorption device shown has a water inlet 1 and a water outlet 2, a filling chamber 5 is provided inside the wastewater adsorption device, the water inlet 1 is provided with a sand core valve 3-1, and the water inlet 1 is located in the waste water adsorption device Below, the water outlet 2 is provided with a sand core valve 3-2, the water outlet 2 is located above the wastewater adsorption device, and the filling chamber 4 is located at the lower edge of the water outlet and extends to the lower edge of the water inlet. The titanium pillared montmorillonite is filled to be parallel to the lower edge of the water outlet 2 by the adsorption filler.

[0039] There are three adsorption devices connected in series, the former water outlet 2 is connected to the latter water inlet 1, and titanium pillared montmorillonite is filled in the adsorption device as an adsorption filler.

[0040] The waste water containing 100mg / L lead metal ion e...

Embodiment 3

[0047] (1) described adsorption device is with embodiment 1, and the waste water that will contain 50mg / L chromium metal ion enters from the water inlet 1 of adsorption device, flows through titanium pillared montmorillonite (TiO 2 After -MMT) adsorbent, it flows out through the water outlet 2, and it is detected that the concentration of chromium metal ion in the water is <0.1mg / L, and the discharge is up to standard;

[0048] (2) When the wastewater containing chromium metal ions flows through the first adsorption device, the concentration of chromium metal ions at the outlet of the last adsorption device does not change (it can be tested by the electrochemical workstation that there is no obvious chromium ion reduction peak), the adsorbent Adsorption saturation, immerse the adsorption saturated titanium pillared montmorillonite in 2mol / L HNO 3 In aqueous solution, shake for 40 minutes, centrifuge to obtain supernatant and precipitate, wash the precipitate with water and abs...

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Abstract

The invention discloses a method for removing heavy metal ions from waste water and solidifying and recycling the heavy metal ions. The method comprises the following steps of: making the waste water containing the heavy metal ions pass through a waste water adsorption device using titanium pillared montmorillonite as an adsorption filling agent, taking the adsorbed saturated titanium pillared montmorillonite out, soaking in an acid solution, oscillating for 40 to 80 minutes, performing centrifugal separation to obtain supernate and sediment, and recycling the sediment which is the titanium pillared montmorillonite; and putting the supernate into an electrolytic bath to serve as electrolyte, performing electro-deposition in a thermostatic water bath of 20 to 70 DEG C by using copper or lead as a cathode and using a graphite electrode as an anode, and obtaining the heavy metal ions after the electro-deposition. By the method, the adsorption and solidification effect on the heavy metal ions in the industrial waste water can reach over 95 percent, the titanium pillared montmorillonite can be recycled, the efficiency is improved, the cost is reduced, and the sustainable development strategy is met.

Description

(1) Technical field [0001] The invention relates to a method for removing heavy metal ions from waste water, solidifying and recovering heavy metal ions, in particular to a method for recovering a curing agent for heavy metal ions. (2) Background technology [0002] With the continuous development of my country's industrialization and urbanization process, metal pollution incidents are also showing an intensifying trend. It is estimated that 12 million tons of grains are polluted by heavy metals nationwide every year, causing direct economic losses of more than 20 billion yuan. According to the Ministry of Land and Resources, more than 10% of the country's cultivated land area has been polluted by heavy metals. These heavy metals remain in the soil for as short as decades (such as cadmium) and as long as tens of thousands of years (such as lead). Once heavy metals enter the human body through drinking, eating, breathing or direct contact, it will greatly damage the functio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C25C1/00C02F101/20
Inventor 李国华程媛何莹
Owner ZHEJIANG UNIV OF TECH