Adsorbent for heavy metal wastewater treatment and preparation method thereof

A wastewater treatment and adsorbent technology, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of unsatisfactory treatment effect, secondary pollution, high cost, etc., and achieve convenient Recycling, preventing soaking and loosening, and low raw material cost

Pending Publication Date: 2020-08-18

河北省廊坊水文水资源勘测局

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AI-Extracted Technical Summary

Problems solved by technology

[0003] At present, the methods for treating heavy metal wastewater mainly include precipitation method, ion resin exchange method, electrolysis method, adsorption method, reverse osmosis method, electrodialysis method, etc. These methods have achieved good results to some extent, but they are also common There are problems of secondary pollution, high cost, and unsatisfactory treatment effect

[0004] Adsorption is an important physical and chemical method in the treatment of heav...

Method used

Known by embodiment 1-5 in table 1, the addition of sodium bicarbonate and modified zeolite powder activation adopts the concentration of acid and modified attapulgite activation adopts the concentration of alkali, all can affect adsorbent to heavy metal The adsorption capacity of ion; Known by embodiment 3 and comparative example 1, zeolite and attapulgite are first pulverized and roasted and activated again, which helps to improve the adsorption capacity of adsorbent to heavy metal ion; as known by embodiment 3 and comparative example 2, Hydrophilic modification of modified zeolite powder...

Abstract

The invention discloses an adsorbent for heavy metal wastewater treatment and a preparation method thereof. The adsorbent comprises 100-200 parts of modified zeolite powder, 50-100 parts of modified attapulgite, 25-75 parts of a hydrophilic modifier, 5-30 parts of sodium bicarbonate, 75-150 parts of aluminosilicate powder and 300-600 parts of water. The preparation method comprises the steps: step1, preparing the modified zeolite powder; step 2, preparation of the modified attapulgite; step 3, carrying out hydrophilic modification on the modified zeolite powder and the modified attapulgite; step 4, preparing an adsorbent core; and step 5, wrapping an adsorbent shell. The adsorbent has the advantages of good hydrophilicity, strong adsorption capacity, low price and easiness in separation from wastewater, and the preparation process and required production equipment are simple and are easy for industrial production.

Application Domain

Other chemical processesAluminium silicates +3

Technology Topic

Sodium bicarbonateSorbent +6

Examples

Experimental program(5)
Comparison scheme(4)
Effect test(1)

Example Embodiment

[0026] Example 1

[0027] An adsorbent for heavy metal wastewater treatment, comprising the following parts by weight of raw materials: 100 parts of modified zeolite powder, 100 parts of modified attapulgite, 40 parts of hydrophilic modifier, 15 parts of sodium bicarbonate, and aluminosilicate 100 parts of powder and 400 parts of water.

[0028] Further, the hydrophilic modifier is a polyether surfactant.

[0029] A method for preparing an adsorbent for heavy metal wastewater treatment, including the following steps:

[0030] Step 1. Preparation of modified zeolite powder. Natural zeolite is crushed and passed through a 100-mesh sieve to obtain zeolite powder. The zeolite powder is placed in a muffle furnace, heated to 600°C, roasted at a constant temperature for 2 hours, taken out, and cooled naturally. Add 1mol/L hydrochloric acid to the calcined zeolite powder. The ratio of the volume of hydrochloric acid to the mass of the zeolite powder is 1mL:3g. Stir it evenly. Place it under ultrasonic conditions for 30 minutes of ultrasound, with an ultrasonic power of 600W, and vacuum filter after standing. , And washed with distilled water to neutrality to obtain a filter cake, which is dried, crushed and passed through a 100-mesh sieve to obtain modified zeolite powder;

[0031] Step 2. Preparation of modified attapulgite, crush the attapulgite and pass a 100-mesh sieve, send it to the muffle furnace, roast at 550℃ for 2h, take it out and cool it naturally, then add 0.8mol/L sodium hydroxide , The ratio of the volume of sodium hydroxide to the mass of attapulgite is 1mL:3g, stir evenly, and place it under ultrasonic conditions for 30 minutes of ultrasonic, ultrasonic power of 600W, vacuum filter after standing, and wash with distilled water to neutral, get The filter cake is dried, crushed and passed through a 100-mesh sieve to obtain modified attapulgite;

[0032] Step 3. Weigh the modified zeolite powder, modified attapulgite and hydrophilic modifier into water in parts by weight, stir evenly, heat to 85°C, sonicate for 20min, ultrasonic power is 600W, vacuum filter after standing, Wash with distilled water, dry, pulverize and pass through a 100-mesh sieve to obtain a hydrophilic mixture;

[0033] Step 4. Weigh the hydrophilic mixture and sodium bicarbonate in parts by weight, and send them to the mixer for mixing. The mixing speed is 350r/min and the mixing time is 10min. After the mixing is uniform, the mixture is sent to the drum for granulation In the machine, a pressure pump is used to spray water into the drum granulator through a spray device for granulation to prepare an adsorbent core;

[0034] Step 5. Add aluminosilicate powder to the above-mentioned drum granulator with the core of the adsorbent by weight to form a coating layer on the surface of the core of the adsorbent, and put the particles with the coating layer into the muffle furnace Roasting, heating rate 1°C/min, heating to 800°C, roasting time 2h, prepare adsorbent.

Example Embodiment

[0035] Example 2

[0036] An adsorbent for heavy metal wastewater treatment, comprising the following parts by weight of raw materials: 150 parts of modified zeolite powder, 75 parts of modified attapulgite, 45 parts of hydrophilic modifier, 10 parts of sodium bicarbonate, and aluminosilicate 110 parts of powder and 450 parts of water.

[0037] Further, the hydrophilic modifier is a polyether surfactant.

[0038] A method for preparing an adsorbent for heavy metal wastewater treatment, including the following steps:

[0039] Step 1. Preparation of modified zeolite powder. Natural zeolite is crushed and passed through a 100-mesh sieve to obtain zeolite powder. The zeolite powder is placed in a muffle furnace, heated to 600°C, roasted at a constant temperature for 2 hours, taken out, and cooled naturally. Add 0.1 mol/L hydrochloric acid to the calcined zeolite powder. The ratio of the volume of hydrochloric acid to the mass of the zeolite powder is 1mL: 3g. Stir it evenly. Place it under ultrasonic conditions for 30 minutes of ultrasound, and the ultrasonic power is 600W. After standing, vacuum pump Filter and wash with distilled water to neutrality to obtain a filter cake, which is dried, crushed and passed through a 100 mesh sieve to obtain modified zeolite powder;

[0040] Step 2. Preparation of modified attapulgite. The attapulgite is crushed and passed through a 100-mesh sieve, sent to a muffle furnace, roasted at 550°C for 2h, taken out and cooled naturally, and then 0.5mol/L sodium hydroxide is added , The ratio of the volume of sodium hydroxide to the mass of attapulgite is 1mL:3g, stir evenly, and place it under ultrasonic conditions for 30 minutes of ultrasonic, ultrasonic power of 600W, vacuum filter after standing, and wash with distilled water to neutral, get The filter cake is dried, crushed and passed through a 100-mesh sieve to obtain modified attapulgite;

[0041] Step 3. Weigh the modified zeolite powder, modified attapulgite and hydrophilic modifier into water in parts by weight, stir evenly, heat to 85°C, sonicate for 20min, ultrasonic power is 600W, vacuum filter after standing, Wash with distilled water, dry, and crush to obtain a hydrophilic mixture;

[0042] Step 4. Weigh the hydrophilic mixture and sodium bicarbonate in parts by weight, and send them to the mixer for mixing. The mixing speed is 350r/min and the mixing time is 10min. After the mixing is uniform, the mixture is sent to the drum for granulation In the machine, a pressure pump is used to spray water into the drum granulator through a spray device for granulation to prepare an adsorbent core;

[0043] Step 5. Add aluminosilicate powder to the above-mentioned drum granulator with the core of the adsorbent by weight to form a coating layer on the surface of the core of the adsorbent, and put the particles with the coating layer into the muffle furnace Roasting, heating rate 1°C/min, heating to 800°C, roasting time 2h, prepare adsorbent.

Example Embodiment

[0044] Example 3

[0045] An adsorbent for heavy metal wastewater treatment, comprising the following parts by weight of raw materials: 150 parts of modified zeolite powder, 75 parts of modified attapulgite, 45 parts of hydrophilic modifier, 20 parts of sodium bicarbonate, and aluminosilicate 110 parts of powder and 450 parts of water.

[0046] Further, the hydrophilic modifier is a polyether surfactant.

[0047] A method for preparing an adsorbent for heavy metal wastewater treatment, including the following steps:

[0048] Step 1. Preparation of modified zeolite powder. Natural zeolite is crushed and passed through a 100-mesh sieve to obtain zeolite powder. The zeolite powder is placed in a muffle furnace, heated to 600°C, roasted at a constant temperature for 2 hours, taken out, and cooled naturally. Add 1mol/L hydrochloric acid to the calcined zeolite powder. The ratio of the volume of hydrochloric acid to the mass of the zeolite powder is 1mL:3g. Stir it evenly. Place it under ultrasonic conditions for 30 minutes of ultrasound, with an ultrasonic power of 600W, and vacuum filter after standing. , And washed with distilled water to neutrality to obtain a filter cake, which is dried, crushed and passed through a 100-mesh sieve to obtain modified zeolite powder;

[0049] Step 2. Preparation of modified attapulgite, crush the attapulgite and pass a 100-mesh sieve, send it to the muffle furnace, roast at 550℃ for 2h, take it out and cool it naturally, then add 0.8mol/L sodium hydroxide , The ratio of the volume of sodium hydroxide to the mass of attapulgite is 1mL:3g, stir evenly, and place it under ultrasonic conditions for 30 minutes of ultrasonic, ultrasonic power of 600W, vacuum filter after standing, and wash with distilled water to neutral, get The filter cake is dried, crushed and passed through a 100-mesh sieve to obtain modified attapulgite;

[0050] Step 3. Weigh the modified zeolite powder, modified attapulgite and hydrophilic modifier into water in parts by weight, stir evenly, heat to 85°C, sonicate for 20min, ultrasonic power is 600W, vacuum filter after standing, Wash with distilled water, dry, and crush to obtain a hydrophilic mixture;

[0051] Step 4. Weigh the hydrophilic mixture and sodium bicarbonate in parts by weight, and send them to the mixer for mixing. The mixing speed is 350r/min and the mixing time is 10min. After the mixing is uniform, the mixture is sent to the drum for granulation In the machine, a pressure pump is used to spray water into the drum granulator through a spray device for granulation to prepare an adsorbent core;

[0052] Step 5. Add aluminosilicate powder to the above-mentioned drum granulator with the core of the adsorbent by weight to form a coating layer on the surface of the core of the adsorbent, and put the particles with the coating layer into the muffle furnace Roasting, heating rate 1°C/min, heating to 800°C, roasting time 2h, prepare adsorbent.

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Classification and recommendation of technical efficacy words

Low raw material cost
Wide variety of sources

Technology for preparing cell-level high purified nickel sulfate by the selective leach of water quenching high grade nickel and sulfuric acid

ActiveCN1544664ALow raw material costAdvanced technology

Owner:JILIN JIEN NICKEL IND

Adsorbent for heavy metal wastewater treatment and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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