Columnar activated carbon capable of being instantly dissolved in water and preparation method of columnar activated carbon

Abstract

The invention discloses columnar activated carbon capable of being instantly dissolved in water and a preparation method of the columnar activated carbon, and relates to the technical field of adsorption material preparation, and the preparation method comprises the following steps: mixing starch with carboxymethyl cellulose to prepare mixed powder; adding water and uniformly stirring to prepare a pasty binder; the preparation method comprises the following steps: mixing 100 parts of powdered activated carbon with 50-80 parts of a binder; pressing and stretching into a carbon strip; and performing cold air drying under negative pressure to obtain the instant activated carbon. The operation steps are simple, the powdered activated carbon is endowed with certain mechanical strength, the adsorption performance is kept, the powdered activated carbon is dissolved in water within several seconds and rapidly reduced into the powdered activated carbon, transportation of the powdered activated carbon is avoided, the dust raising problem in the using process is solved, and the influence on original indexes of the powdered activated carbon is small.

Description

Technical Field

[0001] The invention relates to the technical field of adsorption material preparation, in particular to a water-soluble columnar activated carbon and a preparation method thereof. Background Art

[0002] Powdered activated carbon is made of high-quality sawdust, coconut shells, and coal through series production and processing. Powdered activated carbon has the advantages of fast filtration speed, good adsorption performance, strong decolorization and deodorization ability, economy and durability. The product is widely used in food, beverage, medicine, tap water and other fields. It is also widely used in winemaking, sewage treatment and other fields. The annual output of powdered activated carbon in my country can reach 200,000 tons.

[0003] Because powdered activated carbon easily causes dust to fly in many links such as loading and unloading, unpacking, configuration, and adding processes, on the one hand, it affects the use environment and the working environment of the staff, easily leads to the occurrence of occupational respiratory diseases, and endangers the health of the staff; on the other hand, it causes the loss of powdered activated carbon, resulting in the waste of powdered activated carbon, which has become a key issue restricting the use of powdered activated carbon technology.

[0004] In the process of using existing powdered activated carbon, negative pressure is often used to prevent powder from flying, and liquid spraying is often used to prevent powder from flying. The above methods are only protective measures taken after the powdered activated carbon is scattered, which only treats the symptoms but not the root cause. Moreover, in the transfer link, the scattered powdered activated carbon is not easy to handle, and there are few treatment devices and methods. Summary of the invention

[0005] In order to solve a series of problems such as the existing powdered activated carbon is easy to scatter in many links, causing product waste and affecting the working environment, and then affecting the health of operators, the present invention provides a water-soluble columnar activated carbon and a preparation method thereof.

[0006] The present invention is implemented by the following technologies: The present invention provides a method for preparing columnar activated carbon that is quickly soluble in water, comprising the following steps: a. Binder configuration 70-95 parts of starch and 5-30 parts of carboxymethyl cellulose are mixed to prepare a mixed powder; 1 part of the mixed powder is added with 25-50 parts by weight of water, stirred evenly, to prepare a paste-like adhesive.

[0007] As an alternative, the binder is clay or attapulgite.

[0008] b. Mixed Take 100 parts of 325 mesh powdered activated carbon with an iodine adsorption value of 800-1000 mg / g, and mix them with 50-80 parts of the binder prepared in step a; mix them in a mixer for 25 minutes.

[0009] c. Press forming The mixed materials are pressed and stretched at 13-14 MPa in a hydraulic press to obtain a Φ2.0 mm carbon bar.

[0010] d. Cold air drying The formed carbon bars obtained in step c are cold-dried under negative pressure. Specifically, the formed carbon bars are conveyed to a cold-air dryer through a belt conveyor and an elevator for cold-air drying to obtain instant activated carbon.

[0011] The present invention also provides a water-soluble columnar activated carbon prepared according to the method.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The method for preparing water-soluble columnar activated carbon provided by the present invention is simple in operation steps, and further processing can be directly performed on the existing product to process the powdered activated carbon into columnar activated carbon, thereby imparting a certain mechanical strength. The obtained activated carbon basically retains the adsorption performance of the powdered activated carbon, dissolves in water within a few seconds, and is quickly dissolved and then restored to powdered activated carbon, thereby avoiding the transportation of the powdered activated carbon, solving the dust problem during use, and having little effect on the original indicators of the powdered activated carbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A diagram showing the dissolution behavior of an example of the present invention.

[0014] Figure 2 A diagram showing the dissolution of a comparative example of the present invention. DETAILED DESCRIPTION

[0015] The specific embodiments of the present invention are described in detail below. Example

[0016] A method for preparing quick-soluble columnar activated carbon in water, the specific steps are as follows: a. Binder configuration 92 parts of starch and 8 parts of carboxymethyl cellulose were mixed to prepare a mixed powder; 1 part of the mixed powder was added with 50 parts by weight of water and stirred to prepare a paste-like binder; b. Mixed Take 100 parts of 325 mesh powdered activated carbon with an iodine adsorption value of 830 mg / g, and mix it with 60 parts of the binder prepared in step a in a mixer for 25 minutes; c. Press forming The mixed materials are pressed and stretched in a hydraulic press at 13-14 MPa to obtain a Φ2.0 mm carbon bar; d. Cold air drying The formed carbon strips obtained in step c are transported to a cold air dryer via a belt conveyor and an elevator, and cold air dried under negative pressure to obtain quick-soluble activated carbon. Comparative Example

[0017] Ordinary columnar activated carbon was taken as a comparative example.

[0018] 1. Index detection The iodine adsorption values ​​of the embodiment and the comparative example were detected, and the iodine adsorption value of the comparative example was 812 mg / g; the iodine adsorption value of the embodiment was 819 mg / g, and the index reduction ratio was 1.3%, which retained the adsorption performance of the powdered activated carbon to a large extent.

[0019] 2. Simulation Testing Take two identical 200ml beakers, add equal amounts of water, add the activated carbon prepared in Example and Comparative Example respectively, and observe the dissolution in water. Figure 1 , 2 shown.

[0020] It can be observed that the activated carbon in the example dissolved in water within seconds, while the activated carbon in the comparative example did not dissolve and quickly sank to the bottom of the water.

[0021] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing columnar activated carbon that is quickly soluble in water, characterized in that: The following steps are involved: a. Binder configuration Mix 70-95 parts of starch with 5-30 parts of carboxymethyl cellulose to prepare a mixed powder; add 25-50 parts by weight of water to 1 part of the mixed powder and stir well to prepare a paste-like adhesive; b. Mixed Take 100 parts of 325 mesh powdered activated carbon with an iodine adsorption value of 800 to 1000 mg / g and mix it with 50 to 80 parts of the binder prepared in step a; c. Press forming The mixed materials are pressed and stretched at 13-14 MPa to obtain Φ2.0 mm carbon bars; d. Cold air drying The formed carbon strip obtained in step c is dried by cold air under negative pressure to obtain instant activated carbon.

2. The method for preparing a water-soluble columnar activated carbon according to claim 1, characterized in that: Step b is carried out in a mixer with a mixing time of 25 min.

3. The method for preparing a water-soluble columnar activated carbon according to claim 1, characterized in that: Step c is carried out in a hydraulic press with a molding pressure of 13-14 MPa.

4. The method for preparing a water-soluble columnar activated carbon according to claim 1, characterized in that: In step d, the formed carbon strips are transported to a cold air dryer via a belt conveyor and an elevator for cold air drying.

5. The method for preparing a water-soluble columnar activated carbon according to claim 1, characterized in that: The specific steps include: a. Binder configuration 92 parts of starch and 8 parts of carboxymethyl cellulose were mixed to prepare a mixed powder; 1 part of the mixed powder was added with 50 parts by weight of water and stirred to prepare a paste-like binder; b. Mixed Take 100 parts of 325 mesh powdered activated carbon with an iodine adsorption value of 830 mg / g, and mix it with 60 parts of the binder prepared in step a in a mixer for 25 minutes; c. Press forming The mixed materials are pressed and stretched in a hydraulic press at 13-14 MPa to obtain a Φ2.0 mm carbon bar; d. Cold air drying The formed carbon strips obtained in step c are transported to a cold air dryer via a belt conveyor and an elevator, and cold air dried under negative pressure to obtain quick-soluble activated carbon.

6. A water-soluble columnar activated carbon prepared according to claim 1.

Images