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Nanometer lanthanum oxide defluoridation adsorbent and preparation method thereof

An adsorbent, lanthanum hydroxide technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, alkali metal oxides/hydroxides, etc. Low efficiency and other problems, to achieve the effect of stable adsorption capacity, strong adsorption regeneration performance, and large specific surface area

Inactive Publication Date: 2019-01-11
XIAN ENVIROMENTAL PROTECTION IND TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] 4. Traditional adsorption method
[0015] Traditional adsorption filter materials include activated carbon, activated alumina, etc., but the disadvantages of traditional filter materials are that the adsorption capacity of filter materials is small, the treatment efficiency is low, and the treatment time is long; the exchange capacity of some filter materials decreases after regeneration, and the reuse effect is not good.

Method used

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  • Nanometer lanthanum oxide defluoridation adsorbent and preparation method thereof
  • Nanometer lanthanum oxide defluoridation adsorbent and preparation method thereof
  • Nanometer lanthanum oxide defluoridation adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1. Place the reactor container in ice water at 10°C, and add deionized water to the reactor container;

[0043] Step 2, adding 130g of lanthanum nitrate solid powder into the above-mentioned low-temperature deionized water, stirring and dissolving with a stirrer;

[0044] Step 3, after dissolving, slowly add sodium hydroxide solution to adjust the pH to 8.5; at this time, the mass ratio of water: lanthanum nitrate: sodium hydroxide is 5:2:0.4;

[0045] Step 4, repeatedly rinsing the solution prepared in step 3 with deionized water until the conductivity is below 1 ms / cm;

[0046] Step 5, dehydrate the slurry washed in step 4 with a centrifuge, and dry it in an oven at 90°C;

[0047] Step 6, grinding, and screening through a 100-mesh sieve to obtain dry powder of lanthanum hydroxide;

[0048] Step 7. Mix lanthanum hydroxide dry powder with microcrystalline cellulose and hydroxypropyl methylcellulose, and granulate through a wet granulator and a spheronizer, wherei...

Embodiment 2

[0058] Step 1. Place the reactor container in ice water at 10°C, and add deionized water to the reactor container;

[0059] Step 2, adding 130g of lanthanum nitrate into the above-mentioned deionized water, stirring and dissolving with a stirrer;

[0060] Step 3. Slowly add sodium hydroxide solution to adjust the pH to 9.0; at this time, the mass ratio of water: lanthanum nitrate: sodium hydroxide is 2:1:0.2;

[0061] Step 4, repeatedly rinsing the above solution with deionized water until the conductivity is below 1 ms / cm;

[0062] Step 5, dehydrate the slurry washed in step 4 at 1500r / min with a centrifuge, and dry at 60°C in an oven;

[0063] Step 6, grinding, and screening through a 100-mesh sieve to obtain dry powder of lanthanum hydroxide;

[0064] Step 7. Mix lanthanum hydroxide dry powder with microcrystalline cellulose and hydroxypropylmethyl cellulose, and granulate through a wet granulator and a spheronizer, wherein lanthanum hydroxide: microcrystalline cellulose:...

Embodiment 3

[0067] Step 1. Place the reactor vessel in ice water at 10°C; add deionized water to the reactor vessel;

[0068] Step 2, adding 130g of lanthanum nitrate into the above water, stirring and dissolving with a stirrer;

[0069] Step 3. Slowly add sodium hydroxide solution to adjust the pH to 9.0; at this time, the mass ratio of water: lanthanum nitrate: sodium hydroxide is 7:4:0.1;

[0070] Step 4, repeatedly rinsing the above solution with deionized water until the conductivity is below 1 ms / cm;

[0071] Step 5, dehydrate the slurry washed in step 4 with a centrifuge, and dry it in an oven at 90°C;

[0072] Step 6, grinding, and screening through a 100-mesh sieve to obtain dry powder of lanthanum hydroxide;

[0073] Step 7. Mix lanthanum hydroxide dry powder with microcrystalline cellulose and hydroxypropyl methylcellulose, and granulate through a wet granulator and a spheronizer, wherein, lanthanum hydroxide: microcrystalline cellulose: hydroxypropyl methylcellulose The mas...

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Abstract

The invention relates to a nanometer lanthanum hydroxide defluoridation adsorbent and a preparation method thereof. The preparation method comprises: 1, putting a reactor container in ice water at 10-35 DEG C and adding deionized water into the reactor container, 2, adding lanthanum nitrate solid powder into the deionized water in the step 1 and carrying out stirring dissolution through a stirrer,3, slowly adding a sodium hydroxide solution into the lanthanum nitrate solution and adjusting pH to 8.5-9.0, 4, repeatedly rinsing the solution in the step 3 through deionized water, 5, dehydratingthe washed slurry through a centrifuge and then drying the slurry, 6, grinding the dried slurry and screening dry powder of lanthanum hydroxide, and 7, mixing the dry powder of lanthanum hydroxide, microcrystalline cellulose and hydroxypropylmethylcellulose b and carrying out granulation through a wet granulator and a spheronizator. The preparation method is simple. The nanometer lanthanum hydroxide defluoridation adsorbent has high fluorine ion adsorbing efficiency and a long regeneration cycle.

Description

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a nanometer lanthanum hydroxide adsorbent for defluorination and a preparation method thereof. Background technique [0002] "Endemic fluorosis" is a typical endemic fluorosis disease, and it is a popular research topic in the field of environmental geochemistry. [0003] Fluorine is an essential micronutrient element for the human body. It is a chemical substance involved in the normal metabolism of the human body. It can promote the calcification of teeth and bones. However, after the human body ingests too much fluoride, fluorosis will occur, causing tooth and bone lesions leading to "skeletal fluorosis" and "dental fluorosis". In severe cases, limbs deform, spine curvature, muscle atrophy and paralysis, and cause diseases such as anemia. [0004] "Earth fluorosis" is one of the more common fluorosis diseases related to excessive fluoride in groundwater. This disease w...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/28B01J20/06C02F1/28C02F101/14
CPCB01J20/06B01J20/28007C02F1/281C02F2101/14
Inventor 苏林东齐泽宁雷香赵胜美
Owner XIAN ENVIROMENTAL PROTECTION IND TRADE
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