CN104190381A - Modified attapulgite heavy metal ion adsorbing agent and preparation method thereof - Google Patents

Abstract

The invention relates to a modified attapulgite heavy metal ion adsorbing agent. The modified attapulgite heavy metal ion adsorbing agent is prepared from the following raw materials in parts by weight: 1 to 2 parts of ammonium sulfate, 2 to 3 parts of water glass, 2 to 3 parts of malonic acid, 6 to 9 parts of layering expanded vermiculite, 0.2 to 0.4 part of citronellol, 1 to 2 parts of a silane coupling agent with amino group, 1 to 2 parts of sodium carboxymethylcellulose, 100 to 120 parts of attapulgite, an appropriate amount of water, 5 to 10 parts of assistants and 20 to 30 parts of a 2% to 3% sodium hydroxide solution. The dispersibility, suspension property, adsorption property and thickening performance of the attapulgite are improved, and the attapulgite is endowed with acid resistance and salt resistance as well as a toxic-free property; the attapulgite modification agent is uniform in modification and unlikely to drop, can be used as an adsorbing agent or a flocculating agent and can remove heavy metal ions, such as copper, in water.

Description

A kind of attapulgite modified adsorbent for heavy metal and preparation method thereof

Technical field

The invention belongs to attapulgite manufacture field, particularly a kind of attapulgite modified adsorbent for heavy metal and preparation method thereof.

Background technology

Attapulgite has unique dispersion, high temperature resistant, the anti-good colloidal nature such as saline and alkaline and higher adsorption bleaching ability.And there is certain plasticity and cohesive force, and water imbibition is strong, tool viscosity and plasticity when wet, and dry after-contraction is little, not quite aobvious crackle, water soaking collapses loose, and suspension is met not flocculation sediment of dielectric.Therefore attapulgite is widely used in the numerous areas such as sewage disposal, adsorption cleaning, washing agent, rubber, coating, papermaking, light industry, agricultural, cosmetics, is a kind of important nonmetallic minerals.

In order further to improve the result of use of attapulgite, strengthen its overall physical and chemical performance, conventionally before use it is carried out to modification, improve the dispersive property of attapulgite, gel viscosity, colloidity, rheological property.The current attapulgite modified needs that can not meet productive life in a lot of performances, also require further improvement its performance.

Summary of the invention

The object of the present invention is to provide a kind of attapulgite modified adsorbent for heavy metal and preparation method thereof, this attapulgite dispersiveness, suspension, adsorptivity and thickening properties are good, antiacid anti-salt property is good, and nontoxic, can be except heavy metal ion such as the copper in anhydrating.

Technical scheme of the present invention is as follows:

A kind of attapulgite modified adsorbent for heavy metal, is characterized in that being made up of the raw material of following weight portion: ammonium sulfate 1-2, waterglass 2-3, malonic acid 2-3, layering expanded vermiculite 6-9, citronellol 0.2-0.4, silane coupler 1-2, sodium carboxymethylcellulose 1-2 with amino, attapulgite 100-120, water are appropriate, auxiliary agent 5-10,2-3% sodium hydroxide solution 20-30;

Described auxiliary agent is made up of the raw material of following weight portion: isobutyl palmitate 0.2-0.3, Porasil 2-3, polyurethane resin 0.4-0.6, ethylene glycol 3-5, vitamin E 0.3-0.4, activated alumina 0.3-0.5, linolenic acid 0.2-0.3, sodium lignin sulfonate 0.3-0.4, pearl powder 1-1.5, bamboo fibre 0.2-0.3, epsom salt 0.1-0.2, charcoal powder 2-3, butanedioic acid 0.2-0.3, double stearic acid aluminium 0.2-0.4, medical stone powder 3-5, silane coupler KH-5721-2; Preparation method is: Porasil, pearl powder, charcoal powder, medical stone powder, silane coupler KH-572 mixed grinding is even, obtain mixed-powder; By other residual components mixing and stirring, with gained powder mixed grinding 20-30 minute, then be heated to 60-70 DEG C again, griding reaction 30-40 minute, to obtain final product.

The preparation method of described attapulgite modified adsorbent for heavy metal, is characterized in that comprising the following steps:

(1) attapulgite, layering expanded vermiculite are sent into calcining furnace, at 300-400 DEG C, calcine 3-4 hour, take out and pulverize, cross 20 mesh sieves, add in the water of 340-360 weight portion, under 100-200 rev/min, stir 10-12 hour, obtain attapulgite suspension, add 2-3% NaOH, be heated to 50-60 DEG C, stir 1-2 hour, then add while stirring malonic acid to continue to stir 1-2 hour, filter, being washed to pH value is 6-8, refilter, dry, obtain activating attapulgite powder;

(2) other residual components are ground evenly, add in residue water, stir, obtain slurry;

(3) blow the hot-air of 60-70 DEG C to attapulgite powder it is seethed, then spray into the slurry that (2) vaporific step obtains in the powder seething, after the two is fully mixed, maintenance temperature is 60-70 DEG C, continues to seethe 30-40 minute;

(4) mixed material (3) step being obtained is dried, and grinds to form the particle of 5-80 μ m, to obtain final product.

Beneficial effect of the present invention

Attapulgite of the present invention has not only increased dispersiveness, suspension, adsorptivity and the thickening properties of attapulgite, and has increased antiacid anti-salt property, and nontoxic; This attapulgite modified dose of modification is even, and difficult drop-off is applicable to as adsorbent, flocculant, can be except heavy metal ion such as the copper in anhydrating.

Detailed description of the invention

A kind of attapulgite modified adsorbent for heavy metal, by following weight portion (kilogram) raw material make: ammonium sulfate 1.5, waterglass 2.5, malonic acid 2.5, layering expanded vermiculite 7, citronellol 0.3,, auxiliary agent 7 appropriate with amino silane coupler 1.5, sodium carboxymethylcellulose 1.5, attapulgite 110, water, 2.5% sodium hydroxide solution 25;

Described auxiliary agent by following weight portion (kilogram) raw material make: isobutyl palmitate 0.2, Porasil 2.5, polyurethane resin 0.5, ethylene glycol 4, vitamin E 0.4, activated alumina 0.4, linolenic acid 0.3, sodium lignin sulfonate 0.4, pearl powder 1.3, bamboo fibre 0.2, epsom salt 0.2, charcoal powder 2.5, butanedioic acid 0.2, double stearic acid aluminium 0.3, medical stone powder 4, silane coupler KH-5721.5; Preparation method is: Porasil, pearl powder, charcoal powder, medical stone powder, silane coupler KH-572 mixed grinding is even, obtain mixed-powder; Again by other residual components mixing and stirring, with gained powder mixed grinding 25 minutes, then be heated to 65 DEG C, griding reaction 35 minutes, to obtain final product.

The preparation method of described attapulgite modified adsorbent for heavy metal, comprises the following steps:

(1) attapulgite, layering expanded vermiculite are sent into calcining furnace, at 350 DEG C, calcine 3.5 hours, take out and pulverize, cross 20 mesh sieves, add in the water of 350 weight portions, under 150 revs/min, stir 11 hours, obtain attapulgite suspension, add 2.5% NaOH, be heated to 55 DEG C, stir 1.5 hours, then add while stirring malonic acid to continue to stir 1.5 hours, filter, being washed to pH value is 6, refilter, dry, obtain activating attapulgite powder;

(2) other residual components are ground evenly, add in residue water, stir, obtain slurry;

(3) blow the hot-air of 65 DEG C to attapulgite powder it is seethed, then spray into the slurry that (2) vaporific step obtains in the powder seething, after the two is fully mixed, keeping temperature is 65 DEG C, continues to seethe 35 minutes;

(4) mixed material (3) step being obtained is dried, and grinds to form the particle of 5-80 μ m, to obtain final product.

Experimental data:

The attapulgite modified specific area of the present embodiment is 296 ㎡/g, is added to the water by 4%, and tested viscosity is 12855.5mPa.s, dissolution time≤5min, and degree of discoloring >=25%, is 76% to copper ion clearance.As can be seen from the above data, the excellent adsorption of this attapulgite, good to heavy metal ion removal effect, thickening property is good.

Claims (2)

1. an attapulgite modified adsorbent for heavy metal, is characterized in that being made up of the raw material of following weight portion: ammonium sulfate 1-2, waterglass 2-3, malonic acid 2-3, layering expanded vermiculite 6-9, citronellol 0.2-0.4, silane coupler 1-2, sodium carboxymethylcellulose 1-2 with amino, attapulgite 100-120, water are appropriate, auxiliary agent 5-10,2-3% sodium hydroxide solution 20-30;

Described auxiliary agent is made up of the raw material of following weight portion: isobutyl palmitate 0.2-0.3, Porasil 2-3, polyurethane resin 0.4-0.6, ethylene glycol 3-5, vitamin E 0.3-0.4, activated alumina 0.3-0.5, linolenic acid 0.2-0.3, sodium lignin sulfonate 0.3-0.4, pearl powder 1-1.5, bamboo fibre 0.2-0.3, epsom salt 0.1-0.2, charcoal powder 2-3, butanedioic acid 0.2-0.3, double stearic acid aluminium 0.2-0.4, medical stone powder 3-5, silane coupler KH-5721-2; Preparation method is: Porasil, pearl powder, charcoal powder, medical stone powder, silane coupler KH-572 mixed grinding is even, obtain mixed-powder; By other residual components mixing and stirring, with gained powder mixed grinding 20-30 minute, then be heated to 60-70 DEG C again, griding reaction 30-40 minute, to obtain final product.

2. the preparation method of attapulgite modified adsorbent for heavy metal according to claim 1, is characterized in that comprising the following steps:

(1) attapulgite, layering expanded vermiculite are sent into calcining furnace, at 300-400 DEG C, calcine 3-4 hour, take out and pulverize, cross 20 mesh sieves, add in the water of 340-360 weight portion, under 100-200 rev/min, stir 10-12 hour, obtain attapulgite suspension, add 2-3% NaOH, be heated to 50-60 DEG C, stir 1-2 hour, then add while stirring malonic acid to continue to stir 1-2 hour, filter, being washed to pH value is 6-8, refilter, dry, obtain activating attapulgite powder;

(2) other residual components are ground evenly, add in residue water, stir, obtain slurry;

(3) blow the hot-air of 60-70 DEG C to attapulgite powder it is seethed, then spray into the slurry that (2) vaporific step obtains in the powder seething, after the two is fully mixed, maintenance temperature is 60-70 DEG C, continues to seethe 30-40 minute;

(4) mixed material (3) step being obtained is dried, and grinds to form the particle of 5-80 μ m, to obtain final product.