Method for removing metal ions from aqueous solution by use of hydrotalcite

A technology of metal ions and heavy metal ions, applied in the field of water treatment, can solve the problems of weak mechanical strength of adsorbents, low removal efficiency, poor chemical stability, etc., to improve the surrounding environment, high economic and social benefits, and low cost. Effect

Inactive Publication Date: 2012-02-01
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] When the prior art is dealing with aqueous solutions containing heavy metal ions, it is either inconvenient to operate, easily causing secondary pollution, or the removal efficiency is not high, the cost is high (such as membrane separation method), or the mechanical strength of the added adsorbent is weak, Disadvantages such as poor chemical stability (such as biosorption method)

Method used

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  • Method for removing metal ions from aqueous solution by use of hydrotalcite
  • Method for removing metal ions from aqueous solution by use of hydrotalcite
  • Method for removing metal ions from aqueous solution by use of hydrotalcite

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) the by-product calcium chloride in the soda ash industry is dissolved in water, is made into the solution A that concentration is 0.5mol / L;

[0036] (2) Add sodium hydroxide and aluminum hydroxide to water, heat to dissolve sodium hydroxide and aluminum hydroxide to obtain sodium aluminate solution B; wherein, Na in the sodium aluminate solution 2 O and Al 2 o 3 The molar ratio of is 1.5;

[0037] (3) 300ml of solution B prepared in step (2) is added in the reaction tank with jacket, and in the jacket of the reaction tank with jacket, pass into a circulating oil bath, and the temperature of solution B is adjusted to 30 ℃, under the stirring speed of 200rpm, add 300ml of solution A prepared in step (1) into the reaction tank, and control the ratio of calcium chloride and sodium aluminate in the mixed solution of calcium chloride and sodium aluminate in the reaction tank. The molar ratio was 8, the reaction temperature was controlled at 30°C, and the feeding rate o...

Embodiment 2

[0043] Get some underground drinking water (the content of detected As is 2.3ppm) 500mL in the reactor tank with jacket, get the dry calcium aluminum hydrotalcite 0.5g that embodiment 1 step (4) obtains and join in the reactor, in After stirring (200 rpm) at 25°C for 20 minutes, no As was found in the aqueous solution.

Embodiment 3

[0045] Get 500mL of tailings water from a uranium mine in Jiangxi (see Table 2 for composition) in a jacketed reaction tank, first use alkaline solution to adjust the waste water to weak alkalinity, then get the dry calcium that is obtained in Example 1 step (4) Add 2.5g of aluminum hydrotalcite into the reactor, and stir (200rpm) at 45°C for 20 minutes; it is found that the removal rate of Cr, Cd, Mo, Fe, and Mn in the wastewater is above 99%, and the radioactive elements Ra, Th , The removal rate of U is above 90% (Table 2).

[0046] Table 2 Treatment of tailings water from a uranium mine in Jiangxi with calcium aluminum hydrotalcite (unit: ppm)

[0047]

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Abstract

The invention relates to the field of water treatment, specifically to a method for removing metal ions from an aqueous solution by the use of hydrotalcite. The method provided by the invention comprises the step of removing metal ions from an aqueous solution by the use of hydrotalcite. The metal ions, which refer to heavy metal ions or radioactive substance ions, comprise one or more selected from the group consisting of mercury, chromium, lead, arsenic, cadmium, tin, copper and zinc heavy metal ions. The radioactive substance ions comprise uranium, thorium and radium ions. According to the invention, hydrotalcite is applied in metal ions-containing sewage processing, leading to high metal ion removing efficiency and obvious effects. In the meanwhile, raw material sources for the preparation of hydrotalcite are extensive, the cost is low, the preparation method is simple, energy consumption is low and the investment is also low. Therefore, the method provided by the invention has an extensive application prospect.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for removing metal ions in aqueous solution with hydrotalcite. Background technique [0002] With the development of industrial production and urban modernization, environmental pollution is becoming more and more serious. Since water is the material basis for the survival and development of human beings, the problem of water pollution has attracted people's attention. Heavy metals are one of the main pollutants in the water environment, mainly from electroplating, mining, metallurgy, chemical industry and other industries, and are potentially harmful. Common heavy metals in wastewater are arsenic, mercury, chromium, lead, cadmium, etc. These heavy metals and their compounds only change in form during the process of water migration and transformation, and will not disappear. They are cumulative poisons, which are toxic to both plants and humans. effect. For plants, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/42C02F1/28C01B13/36
Inventor 李志宝马家玉王英军
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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