阅读说明：本技术 一种用于钙离子高效吸附剂的二氧化硅的制备方法 (Preparation method of silicon dioxide for calcium ion efficient adsorbent ) 是由 胡颖妮 于 2020-06-15 设计创作，主要内容包括：本发明提供了一种用于钙离子高效吸附剂的二氧化硅的制备方法,将白炭黑过筛100-200目；配置浓度为20％-30％氢氧化钠溶液；白炭黑加入混合捏合机,加入氢氧化钠溶液,搅拌混合。混合后物料放入烘干箱内,干燥后物料进行煅烧；煅烧温度700-800℃,煅烧2-3h。煅烧后物料加入至反应釜,加水调整至二氧化硅40-50％wt；加入硝酸铵交换4-5h；过滤再加水重复交换直至钠离子含量小于5％。除钠后的物料在110-120℃下干燥3-4h,获得成品。本发明制备方法简单易行,原料成本低廉,利于工业化生产。采用该硅酸盐可与钙等碱土金属进行交换制得二氧化硅防锈颜料。本发明所制备的钙离子高效吸附剂的二氧化硅对钙离子的吸附效率达到8％以上。(The invention provides a preparation method of silicon dioxide for a calcium ion high-efficiency adsorbent, which comprises the steps of sieving white carbon black by 100-mesh and 200-mesh sieve; preparing a sodium hydroxide solution with the concentration of 20-30%; adding the white carbon black into a mixing kneader, adding a sodium hydroxide solution, and stirring and mixing. Placing the mixed materials into a drying box, and calcining the dried materials; the calcination temperature is 700 ℃ and 800 ℃, and the calcination time is 2-3 h. Adding the calcined material into a reaction kettle, and adding water to adjust the weight of the silicon dioxide to 40-50%; adding ammonium nitrate for exchanging for 4-5 h; filtering, adding water, and repeatedly exchanging until the content of sodium ions is less than 5%. Drying the material subjected to sodium removal at the temperature of 110-120 ℃ for 3-4h to obtain a finished product. The preparation method is simple and easy to implement, has low raw material cost, and is beneficial to industrial production. The silicate can be exchanged with alkaline earth metals such as calcium and the like to prepare the silicon dioxide antirust pigment. The adsorption efficiency of the silicon dioxide of the calcium ion high-efficiency adsorbent prepared by the invention to calcium ions reaches more than 8%.)

1. A preparation method of silicon dioxide for a high-efficiency calcium ion adsorbent is characterized by comprising the following steps:

the method comprises the following steps: sieving the white carbon black by 100-200 meshes; preparing a sodium hydroxide solution with the concentration of 20-30%;

step two: adding the sieved white carbon black into a mixing kneader, adding a sodium hydroxide solution at a stirring speed of 30-40r/min, and stirring and mixing for 1-2 h;

step three: putting the mixed materials in the step two into a drying box for drying;

step four: calcining the dried material obtained in the third step;

step five: adding the calcined material obtained in the fourth step into a reaction kettle, and adding water to adjust the weight of the silicon dioxide to 40-50%; adding ammonium nitrate for exchange for 4-5h at the temperature of 25-30 ℃ and the stirring speed of 50-60 r/min; filtering, adding water, and repeatedly exchanging until the content of sodium ions is less than 5%;

step six: and (4) drying the material subjected to sodium removal in the step five at the temperature of 110-120 ℃ for 3-4h to obtain a finished product.

2. The method for preparing silica used for high efficiency calcium ion adsorbent according to claim 1, wherein in the second step, sodium hydroxide is added in an amount that the modulus ratio of silica to sodium oxide is 2.0-2.5 on a dry basis.

3. The method for preparing silica dioxide for high efficiency calcium ion adsorbent as claimed in claim 2, wherein in the third step, the temperature of the drying box is raised to 110-120 ℃, and the drying is completed after the temperature is maintained for 3-4 h.

4. The method for preparing silica used in high efficiency calcium ion adsorbent as claimed in claim 3, wherein in the fourth step, the calcination temperature is 700 ℃ and 800 ℃, and the calcination time is 2-3 h.

5. The method for preparing silicon dioxide used for high-efficiency calcium ion adsorbent according to claim 4, characterized in that in the fifth step, ammonium nitrate is added in an amount of 40-50% of the mass of sodium oxide.

6. The method for preparing silica used for high-efficiency calcium ion adsorbents according to claim 1, wherein in the second step, 3200g of sodium hydroxide solution with a concentration of 20% is added to 1000g of the sieved silica.

7. The method for preparing silica used for high-efficiency calcium ion adsorbent according to claim 1, wherein in the second step, 1800g of sodium hydroxide solution with concentration of 25% is added to 1000g of the sieved silica.

8. The method for preparing silicon dioxide used for high-efficiency calcium ion adsorbents according to claim 1, wherein in the second step, 1340g of 30% sodium hydroxide solution is added to 1000g of the sieved silica.

Technical Field

The invention relates to the technical field of inorganic materials, in particular to a preparation method of silicon dioxide for a calcium ion efficient adsorbent.

Background

According to statistics, the metal loss caused by corrosion in the world every year is up to 20-40% of the annual metal yield. Meanwhile, the corrosion damage of metal equipment and facilities can also influence the stability of production to cause safety accidents and personal injury. Therefore, corrosion protection of metals is of great importance. Corrosion protection using coatings has been by far the most effective method.

At present, lead red, chromate and other rust-proof pigments containing lead, chromium and other heavy metals are used in a large amount in the traditional corrosion-proof and rust-proof pigments, which cause great harm to the environment and the like, and the pigments are inevitable to be novel nontoxic rust-proof pigments along with increasingly strict environmental requirements.

The rust inhibitive pigments are classified into three types according to the rust inhibitive mechanism including: the physical antirust pigment, common nontoxic physical antirust pigment, is iron oxide red, mica iron oxide, etc. The chemical antirust pigment is phosphate, molybdate, borate, ion exchange type pigment, etc. The comprehensive antirust pigment with both physical and chemical antirust mechanisms includes flaky zinc powder, flaky zinc-aluminum alloy, composite iron-titanium powder, etc.

Among the nontoxic antirust pigments, the ion exchange type antirust pigment is the antirust material with the development prospect, wherein the calcium ion exchange type antirust pigment has higher anticorrosive performance, and researches show that: the adsorption rate of the silicon dioxide to calcium ions plays a determining role in the performance of the calcium ion exchange type antirust pigment.

U.S. patent No. USP 4419137 proposes a method for preparing a calcium ion or zinc ion exchange type inorganic anticorrosive pigment by reacting an alkaline solution containing cations with silica or alumina species containing hydroxyl groups at room temperature.

The Chinese invention patent CN 102391698B provides a nontoxic anticorrosive paint which is environment-friendly, does not contain heavy metal, has excellent anticorrosive effect, cheap raw materials and has cation exchange property and acid corrosion resistance. The anti-corrosion pigment system calcium ion exchange aluminosilicate with the anti-corrosion effect of the coating is an artificial or natural synthetic compound with certain microporous structure, adsorbability and ion exchange property, the compound comprises feldspar, kaolin, zeolite, montmorillonite, bentonite, sodalite, mica and the like, and the calcium ion exchange aluminosilicate ion exchange type anti-rust pigment is prepared by sodium ion exchange reaction, ammonium ion exchange reaction and calcium ion exchange reaction.

Disclosure of Invention

In view of the above-mentioned drawbacks and problems of the prior art, it is an object of embodiments of the present invention to provide a method for preparing silica for a calcium ion high efficiency adsorbent.

In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of silicon dioxide for a high-efficiency calcium ion adsorbent comprises the following steps:

the method comprises the following steps: sieving the white carbon black by 100-200 meshes; preparing a sodium hydroxide solution with the concentration of 20-30%;

step two: adding the sieved white carbon black into a mixing kneader, adding a sodium hydroxide solution at a stirring speed of 30-40r/min, and stirring and mixing for 1-2 h;

step three: putting the mixed materials in the step two into a drying box for drying;

step four: calcining the dried material obtained in the third step;

step five: adding the calcined material obtained in the fourth step into a reaction kettle, and adding water to adjust the weight of the silicon dioxide to 40-50%; adding ammonium nitrate for exchange for 4-5h at the temperature of 25-30 ℃ and the stirring speed of 50-60 r/min; filtering, adding water, and repeatedly exchanging until the content of sodium ions is less than 5%;

step six: and (4) drying the material subjected to sodium removal in the step five at the temperature of 110-120 ℃ for 3-4h to obtain a finished product.

Wherein, in the second step, the adding amount of the sodium hydroxide is that the modulus ratio of the silicon dioxide to the sodium oxide is 2.0-2.5 on a dry basis.

Wherein, in the third step, the temperature of the drying box is raised to 110-120 ℃, and the drying is finished after the heat preservation is carried out for 3-4 h.

Wherein, in the fourth step, the calcination temperature is 700-800 ℃, and the calcination time is 2-3 h.

In the fifth step, the adding amount of ammonium nitrate is 40-50% of the sodium oxide.

In the second step, 3200g of sodium hydroxide solution with the concentration of 20% is added into 1000g of the sieved white carbon black.

In the second step, 1800g of sodium hydroxide solution with the concentration of 25% is added into 1000g of the sieved white carbon black.

In the second step, 1340g of 30% sodium hydroxide solution is added into 1000g of the sieved white carbon black.

According to the invention, the silica for the calcium ion high-efficiency adsorbent is prepared from the white carbon black industrial waste, the raw material cost is low, the industrial production is facilitated, and the adsorption efficiency of the silica for the calcium ion high-efficiency adsorbent prepared by the method on calcium ions is up to more than 8%.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As an example, white carbon black is produced by 200 million tons every year in China, and white carbon black industrial waste materials in ten thousand tons are produced every year, so that great environmental burden is caused. The white carbon black can be qualified white carbon black or waste white carbon black, and the waste white carbon black refers to white carbon black with particle size, moisture, pore volume and oil absorption value which do not reach the standard.

A preparation method of silicon dioxide for a high-efficiency calcium ion adsorbent comprises the following steps:

the method comprises the following steps: sieving the white carbon black by 100-200 meshes; preparing a sodium hydroxide solution with the concentration of 20-30%;

step two: adding the sieved white carbon black into a mixing kneader, adding a sodium hydroxide solution at a stirring speed of 30-40r/min, and stirring and mixing for 1-2 h; the addition amount of the sodium hydroxide is that the modulus ratio of the silicon dioxide to the sodium oxide is 2.0-2.5 on a dry basis.

Step three: and (5) putting the materials mixed in the step two into a drying box, raising the temperature of the drying box to 110-120 ℃, and preserving the heat for 3-4h to finish drying.

Step four: calcining the dried material obtained in the third step; the calcination temperature is 700 ℃ and 800 ℃, and the calcination time is 2-3 h.

Step five: adding the calcined material obtained in the fourth step into a reaction kettle, and adding water to adjust the weight of the silicon dioxide to 40-50%; adding ammonium nitrate for exchange for 4-5h at the temperature of 25-30 ℃ and the stirring speed of 50-60 r/min; filtering, adding water, and repeatedly exchanging until the content of sodium ions is less than 5%. The addition amount of ammonium nitrate is 40-50% of sodium oxide.

Step six: and (4) drying the material subjected to sodium removal in the step five at the temperature of 110-120 ℃ for 3-4h to obtain a finished product.