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Method of high-temperature roasting and acetic acid soaking compound modified active magnesium oxide and the application of the obtained modified active magnesium oxide as a defluoridation agent

A technology of activated magnesium oxide and high temperature roasting, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of metal ion dissolution and low adsorption capacity, and achieve high activity and adsorption effect. Good, high-capacity effect

Active Publication Date: 2015-12-02
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method of high-temperature roasting and acetic acid immersion to compound modified active magnesium oxide. The purpose is to study a kind of defluoridation adsorption with high capacity, high activity, low cost and good safety in view of many disadvantages of existing adsorbents. The method of defluoridation can solve the problem of low adsorption capacity and metal ion dissolution of the current defluoridation adsorbent, which has practical significance and is conducive to drinking water safety and environmental protection

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  • Method of high-temperature roasting and acetic acid soaking compound modified active magnesium oxide and the application of the obtained modified active magnesium oxide as a defluoridation agent

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 A kind of method of high-temperature roasting and acetic acid immersion composite modified active magnesium oxide, carries out according to the following steps successively:

[0027] (1) Put the powdered MgO in the conical flask, put it into the muffle furnace, roast it at 300°C for 3 hours, and then take it out;

[0028] (2) Take the activated magnesia activated in step (1) at high temperature and put it into CH 3 Shake and soak in COOH solution for 80 minutes, then centrifuge and dry at 110°C for later use;

[0029] (3) After immersing the modified activated magnesium oxide in acetic acid and then roasting at a high temperature of 600°C for 4 hours, the modified activated magnesium oxide was obtained.

Embodiment 2

[0031] A method for high-temperature roasting and soaking in acetic acid to compound modified active magnesium oxide is carried out in the following steps:

[0032] (1) Put the powdered MgO in the conical flask, then put it into the muffle furnace, bake it at 360°C for 2 hours, and then take it out;

[0033] (2) Take the activated magnesia activated in step (1) at high temperature and put it into CH 3 Shake and soak in COOH solution for 50 minutes, then centrifuge and dry at 100°C for later use;

[0034] (3) After immersing the modified active magnesium oxide in acetic acid and then roasting at a high temperature of 500° C. for 5 hours, the modified active magnesium oxide was obtained.

Embodiment 3

[0036] A method for high-temperature roasting and soaking in acetic acid to compound modified active magnesium oxide is carried out in the following steps:

[0037] (1) Put the powdered MgO in the conical flask, put it into the muffle furnace, bake it at 500°C for 1 hour, and then take it out;

[0038] (2) Take the activated magnesia after high-temperature activation in step (1), put it into the CH3COOH solution and shake and soak for 80 minutes, then separate it by centrifugation, and dry it at 110°C for later use;

[0039] (3) After immersing the modified activated magnesium oxide in acetic acid and then roasting at a high temperature of 600°C for 4 hours, the modified activated magnesium oxide was obtained.

[0040] The modified active magnesium oxide prepared in Example 2 was used as the fluorine removal adsorbent to absorb fluorine in water and compared with the conventional fluoride removal agent, the results are shown in Table 1.

[0041] Table 1 The defluoridation eff...

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Abstract

The invention discloses a compound modification method of active magnesium oxide through high-temperature roasting and acetic acid soaking. The compound modification method comprises the following steps: firstly roasting powdered MgO at a high temperature of 300-500 DEG C for 1-3 h; taking out, and soaking in an acetic acid solution; after soaking for a period of time, taking out for drying, roasting again at a high temperature so as to obtain the modified active magnesium oxide. The active magnesium oxide modified with the method is good in adsorbing effect, low in cost, safe and reliable, and the modification method is simple and convenient. The active magnesium oxide as an adsorbent for removing fluorine in water has an extremely good application prospect, and has obvious economic, social and environmental benefits.

Description

Technical field: [0001] The invention mainly relates to a modification method of active magnesium oxide, in particular to a method for compounding modified active magnesium oxide by high-temperature roasting and soaking in acetic acid and the application of the obtained modified active magnesium oxide as a fluoride removal agent. Background technique: [0002] Fluoride disease caused by drinking high-fluoride water is one of the most widely distributed endemic diseases in the world. Drinking water with high fluoride content for a long time is harmful to human health. In mild cases, dental fluorosis occurs, in severe cases, bone fluorosis, and even Lose the ability to work. In areas where endemic drinking-water fluorosis occurs, the incidence of bone growth and development disorders in adolescents ranges from 30% to 46%, which is significantly higher than in non-endemic areas. [0003] At present, the removal methods of fluorine in water mainly include adsorption method, ion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/30C02F1/28C02F1/58C02F101/14
Inventor 李学德张小凤徐微段颖王晨晨王慧玲花日茂
Owner ANHUI AGRICULTURAL UNIVERSITY