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Defluorination adsorbent as well as preparation method and application thereof

A technology of adsorbent and raw material, applied in the field of environmentally friendly adsorbent for treating fluoride ions in industrial wastewater and its preparation field, can solve the problems of small pH application range, small saturated adsorption capacity, small adsorption capacity, etc., and achieve simple preparation method, fluorine ion Large adsorption capacity and high fluorine removal rate

Active Publication Date: 2014-11-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former has a small adsorption capacity; the latter has a small pH range and needs to be adjusted, resulting in high processing costs
[0005] The advanced treatment of fluorine-containing wastewater by adsorption method has a good effect. The main direction of future research on fluorine removal by adsorption method is to develop new and efficient adsorbents to overcome the shortage of traditional adsorbents with small saturated adsorption capacity.

Method used

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  • Defluorination adsorbent as well as preparation method and application thereof
  • Defluorination adsorbent as well as preparation method and application thereof
  • Defluorination adsorbent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In parts by mass, mix 1 part of ordinary Portland cement with 3 parts of water and stir for 1 hour to prepare cement slurry; then add a pre-calculated amount of aluminum sulfate solid (85% by mass) into the cement slurry, so that The calcium-aluminum molar ratios are 2.4, 3.2, 3.9, 6.4 respectively (the aluminum content in the cement raw materials is considered in the calculation); the colloidal solid obtained after stirring the cement slurry in a water bath at a constant temperature of 25°C for 24 hours uses nitrocellulose with a pore size of 8.0 μm The filter membrane was subjected to suction filtration; the filter cake was dried in an oven set at 40°C for 24 hours to constant weight; then crushed and ground, passed through a 150-mesh sieve (pore size 106 μm), and the undersize was used as an adsorbent. The results of the measurement are shown in Table 1 and attached figure 2 shown.

[0030] Table 1

[0031]

[0032] Four kinds of adsorbents were prepared (the mo...

Embodiment 2

[0034] In parts by mass, mix 1 part of ordinary Portland cement with 3 parts of water and stir for 1 hour to prepare cement slurry; then add a pre-calculated amount of aluminum sulfate solid (85% by mass) into the cement slurry to make The calcium-aluminum molar ratios are 2.4, 3.2, 3.9, 6.4 respectively (the aluminum content in the cement raw materials is considered in the calculation); the colloidal solid obtained after stirring the cement slurry in a water bath at a constant temperature of 25°C for 24 hours uses nitrocellulose with a pore size of 8.0 μm The filter membrane was subjected to suction filtration; the filter cake was dried in an oven set at 40°C for 24h to constant weight; the obtained dry matter was baked at 175°C for 16h; then crushed and ground, and passed through a 150-mesh (pore size: 106μm) sieve , take the undersize as the adsorbent. Four kinds of adsorbents were prepared (the molar ratios of calcium to aluminum were 2.4, 3.2, 3.9, 6.4, respectively).

...

Embodiment 3

[0040] In parts by mass, mix 1 part of ordinary Portland cement with 3 parts of water and stir for 1 hour to prepare cement slurry; then add a pre-calculated amount of aluminum sulfate solid (85% by mass) into the cement slurry to make The calcium-aluminum molar ratios are 2.4, 3.2, 3.9, 6.4 respectively (the aluminum content in the cement raw materials is considered in the calculation); the colloidal solid obtained after stirring the cement slurry in a water bath at a constant temperature of 25°C for 24 hours uses nitrocellulose with a pore size of 8.0 μm The filter membrane was subjected to suction filtration; the filter cake was dried in an oven set at 40°C for 24h to constant weight; the obtained dry matter was baked at 175°C for 16h; then crushed and ground, and passed through a 150-mesh (pore size: 106μm) sieve , take the undersize as the adsorbent. Four kinds of adsorbents were prepared (the molar ratios of calcium to aluminum were 2.4, 3.2, 3.9, 6.4, respectively).

...

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Abstract

The invention discloses a defluorination adsorbent, which is prepared by the following raw materials: general silicate cement, water and aluminum sulfate at the weight ratio from 5:15:3 to 5:15:4. The invention further discloses a preparation method for the defluorination adsorbent and an application of the defluorination adsorbent to treatment of fluorine ions in industrial wastewater. The defluorination adsorbent prepared by utilizing waste cement paste has the characteristics of being environment-friendly, harmless, low in cost, simple to prepare, high in fluorine adsorption capacity and high in defluorination rate; the preparation method is simple; the saturated adsorption capacity of the defluorination adsorbent on fluorine in water can reach up to 49.3 mg / g and is much higher than that of other adsorption materials; and the treated fluorine-containing industrial wastewater can meet the national comprehensive sewage emission standards.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an environmentally friendly adsorbent for treating fluorine ions in industrial waste water, a preparation method and application thereof. Background technique [0002] Fluorine is one of the essential trace elements for human body. Trace amounts of fluorine can promote children's growth and development and prevent dental caries. The daily intake of fluoride for adults is generally 1.0~1.5mg, excessive intake will endanger health. Fluorine in the human body comes directly from drinking water, food and air. Orally ingested fluoride is absorbed by the gastrointestinal tract, and the absorption rate is about 80% to 97%. Previous studies on the effects of fluorosis mostly focused on the damage to bone tissue. In recent years, it has been found that fluorine has varying degrees of damage to non-bone tissues such as the liver, kidneys, cardiovascular system, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F1/58
Inventor 李轶陈萌萌邢涛张文龙王晴王大伟
Owner HOHAI UNIV
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