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A kind of preparation method of iron-modified red mud-based magnetic adsorbent and its application in composite heavy metal wastewater
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A magnetic adsorbent, red mud technology, applied in adsorption water/sewage treatment, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of secondary pollution of waste liquid, high equipment requirements, etc., to achieve good adsorption and regeneration sexual effect
Active Publication Date: 2022-07-15
CENT SOUTH UNIV
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However, due to the high alkalinity of red mud, the heavy metal adsorbents prepared by public patents such as CN109107524B, CN110721655A and CN109675527A have carried out acid neutralization treatment on red mud, which not only requires high equipment, but also has the possibility of secondary pollution of waste liquid question
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Embodiment 1
[0027] Example 1 Preparation of iron-modified red mud-based magnetic adsorbent
[0028] Example 1 according to figure 1 The flow chart for the preparation of the iron-modified red mud-based magnetic adsorbent is shown.
[0029] 1. Pretreatment: Dry the sintered red mud from a red mud yard of Yuanping Aluminum Company in Shanxi, China, and pass it through a 100-mesh sieve after crushing. After the straw is crushed, pass through a 70-mesh sieve;
[0030] 2. Freeze drying: Mix the pretreated red mud and straw at a ratio of 1:4, and then add 5 mL of the mixture to 5.0 g of the mixture with concentrations of 0, 4, 8, and 16 gL respectively. -1 FeCl 3 The solutions, respectively denoted as S-BR, 0.02-Fe-S-BR, 0.04-Fe-S-BR, 0.08-Fe-S-BR, were uniformly dispersed by ultrasonic. Freeze for 6 hours in an ultra-low temperature refrigerator at -80 °C, and then place it in a freeze-drying apparatus to dry for 48 hours. After freeze-drying, the mixture is ground uniformly;
[0031] 3....
Embodiment 2
[0039] Example 2 Iron-modified red mud-based magnetic adsorbent for Pb 2+ / Cd 2+ Adsorption Experiment of Compound Pollution
[0040]The iron-modified red mud-based magnetic adsorbent prepared in Example 1 was 4gL -1 Dosage added to Pb 2+ / Cd 2+ In the composite polluted solution, after 16h of adsorption experiment, the corresponding adsorption results are shown in Table 3.
[0041] Table 3 - The effect of iron salt addition on adsorption
[0042]
[0043] As can be seen from the table, for Pb 2+ / Cd 2+ Combined heavy metal pollution, the adsorption effect of iron-modified red mud-based magnetic adsorbent is 0.04-Fe-S-BR>0.02-Fe-S-BR>0.08-Fe-S-BR, with the increase of iron salt addition , when red mud: straw: FeCl 3 When the mass ratio of the wastewater is 4:1:0.04, the effluent concentration of the wastewater meets the national comprehensive sewage discharge standard GB 25466-2010 (Cd≤0.1mg L -1 , Pb≤1mg L -1 ), but iron salt-modified red mud has no effect on Pb ...
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Abstract
The invention discloses a preparation method of an iron-modified red mud-based magnetic adsorbent and its application in composite heavy metal waste water. Pretreated red mud; crush and sieve the straw to obtain pretreated straw; 2) Freeze drying: mix the pretreated red mud and straw, and then add FeCl 3 3) Pyrolysis treatment: the mixture is placed in a muffle furnace for high-temperature pyrolysis, and after the pyrolysis is completed, it is cooled to room temperature with the furnace to obtain iron modification Red mud based magnetic adsorbent. The present invention is based on the strategy of "treating waste with waste", adopts a simple method without acid pretreatment of red mud, and modifies the solid waste red mud into a strong magnetic adsorption material and low-cost adsorbent. It can realize the simultaneous removal of multi-metals in wastewater, and has good adsorption and regeneration.
Description
technical field [0001] The invention belongs to the technical field of industrial solid waste recycling and water treatment, and particularly relates to a preparation method of an iron-modified red mud-based magnetic adsorbent and its application in composite heavy metal wastewater. Background technique [0002] With the rapid development of society and the continuous improvement of the industrial level, various environmental problems, especially the pollution status of heavy metals, are becoming more and more serious, including heavy metal pollutants such as Pb, Cd, Cu, As and their compounds. Removal has become an urgent problem to be solved. Adsorption is a common method for removing heavy metals in industrial wastewater, and its removal effect is inseparable from the adsorption materials used. Excellent adsorption materials need to have the characteristics of low cost, large adsorption capacity, and easy regeneration. [0003] Although red mud is a waste produced in th...
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