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Hemp-stalk activated charcoal and preparation method thereof

A technology of activated carbon and hemp stalk, which is applied in the field of activated carbon from hemp stalk and its preparation, can solve the problems of low adsorption value of activated carbon, high cost, and cannot be recycled, and achieves the effects of protecting the environment, concentrating sources and being easy to collect.

Inactive Publication Date: 2014-08-13
FUJIAN XINSEN CARBON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is in the form of activated carbon powdery crude product which is hydraulically granulated into granular activated carbon, while the latter is in the form of powdered activated carbon, and the obtained activated carbon has a low adsorption value. Potassium permanganate is used in the preparation method, which cannot be recycled and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The present embodiment provides a kind of preparation method of hemp stalk activated carbon, comprising the following steps:

[0021] a. Kneading and aging: fully mix the crushed and dried hemp stalks with an activator in a kneader, and mature the hemp stalk fibers to obtain a mixture, and the activator is phosphoric acid;

[0022] B, granulation: Extrude and granulate the mixture obtained in step 1 to obtain pellets, the particle size of the pellets is 1-4mm; granulation can be carried out in a hydraulic extruder or a spiral granulator;

[0023] c, shaping: placing the pellet obtained in step b in a shaping furnace for shaping;

[0024] d. Activation: placing the shaped pellets obtained in step d in an activation furnace for activation;

[0025] e, rinsing and drying: cool the activated pellets obtained in step e naturally, rinse until the pH is 6-7, and dry to obtain hemp stalk activated carbon.

[0026] Further, in the above-mentioned preparation method of hemp sta...

Embodiment 2

[0035] The present embodiment provides a kind of preparation method of hemp stalk activated carbon, comprising the following steps:

[0036] Crush the hemp stalks, sieve, wash and dry, add hemp stalks and phosphoric acid to the kneader at a mass ratio of 1:1.2, the Baume degree of the phosphoric acid is 45°Be, the kneading temperature is 130°C, kneading The time is 30 minutes.

[0037] Granulate the matured material with a particle size of 2 mm.

[0038] Put the pellets into the shaping furnace, set the temperature at 130°C, and set the shaping time for 10 hours.

[0039] Put the shaped pellets into the activation furnace and raise the temperature to 350°C within 30 minutes. The holding time is 10min, and the compressed air is fed in at a flow rate of 10L / min.

[0040] After cooling the activated pellets, use 20 ° Be phosphoric acid to recover the phosphoric acid in the activated carbon, boil for 30 minutes, after three times, boil with clear water for 3-5 times, then rinse...

Embodiment 3

[0042] The present embodiment provides a kind of preparation method of hemp stalk activated carbon, comprising the following steps:

[0043] After the hemp stalks were crushed, sieved, washed and dried, the hemp stalks and phosphoric acid were added to the kneader at a mass ratio of 1:1.5. The Baume degree of the phosphoric acid was 55°Be, the kneading temperature was 150°C, and the kneading time was 30 minutes.

[0044] Granulate the matured material with a particle size of 3 mm.

[0045] Put the pellets into the shaping furnace, set the temperature at 150°C, and set the shaping time for 15 hours.

[0046] Put the shaped pellets into the activation furnace and raise the temperature to 450°C within 30 minutes. The holding time is 15 minutes, and compressed air is introduced at 10L / min.

[0047] After cooling the activated pellets, use 26 ° Be phosphoric acid to recover the phosphoric acid in the activated carbon, boil for 30 minutes, after three times, boil with clean water ...

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Abstract

The invention relates to the field of activated charcoal preparation and particularly relates to hemp-stalk activated charcoal and a preparation method thereof. The method comprises the following steps: (a) kneading and aging: thoroughly mixing hemp stalks and an activator in a kneader, and aging hemp stalk fibers, so as to obtain a mixture, wherein the activator is phosphoric acid; (b) granulating: carrying out extrusion granulation on the mixture obtained in the step (a), so as to obtain a granular material; (c) shaping: shaping the granular material obtained in the step (b) by using a shaping furnace; (d) activating: activating the shaped granular material obtained in the step (c) by using an activation furnace; (e) rinsing and drying, thus obtaining the hemp-stalk activated charcoal. According to the method disclosed by the invention, the phosphoric acid is adopted as the activator and can be partially recovered in an aftertreatment rinsing process, so that the production cost is reduced; the prepared hemp-stalk activated charcoal has the iodine adsorption value of 800-1,100mg / g and the carbon tetrachloride adsorption value of 100-120%.

Description

technical field [0001] The invention relates to the field of activated carbon preparation, in particular to a hemp stalk activated carbon and a preparation method thereof. Background technique [0002] Hemp originated in China and is known as "the source of national textiles, the ancestor of thousands of years of clothing". The discovery and application of hemp ranks first among natural fibers. In my country, hemp has been planted for more than 8,000 years. In Heilongjiang and Inner Mongolia, it is called thread hemp; in Anhui, it is called Hanma; in Guangxi, it is called hemp; Hemp (china-hemp) is also a transliteration of English "hemp". [0003] In recent years, with the rapid development of my country's national economy, the textile and garment industry has also embarked on a fast track. For this reason, the amount of hemp has increased sharply every year, and its planting area has also increased year by year. The relevant domestic departments have embarked on a planti...

Claims

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Application Information

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IPC IPC(8): C01B31/12C01B32/324C01B32/342
Inventor 林鹏林楷
Owner FUJIAN XINSEN CARBON
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