JPH07124466A - Production of adsrobent - Google Patents

Abstract

PURPOSE:To obtain an adsorbent having advantages over activated carbon by mixing a powder such as diatom earth with an organic powder or liquid and activating with steam after dry-distilling and carbonizing. CONSTITUTION:Diatom earth finely pulverized, mixed with a dried material of finely pulverized peat and granulated by spraying water is fed into a rotary kiln. The granulated material fed into a hopper 16 of the rotary kiln is supplied to a 1st zone 21 of a heating cylinder 12 through a supply cylinder 17 by rotating the screw conveyer 18 and is heated in a reducing atmosphere and dry- distilled. The granulated material with the organic material carbonized by dry-distillation is fed into a 2nd zone 22 kept at 800 deg.C through a feeding passage 23 for material to be fired. Water is poured through a nozzle 27 in the 2nd zone and the poured water is converted to steam, which is brought into contact with the carbonized granules to remove tar and to activate. The activated granulated material is discharged from a discharge opening 8 of the heating cylinder 12.

Description

Detailed Description of the Invention

[0001]

The present invention relates to diatomaceous earth, sepiolite,
The present invention relates to a method for producing an adsorbent using a mineral having a large pore volume and a large specific surface area, such as zeolite (hereinafter referred to as diatomaceous earth).

[0002]

2. Description of the Related Art Since fired diatomaceous earth, sepiolite, zeolite and the like have adsorptivity, they are used as water purification filters, air cleaning filters, solvent recovery agents, deodorants, industrial decolorization purification agents, etc. Poor volume and specific surface area are inferior to activated carbon in adsorption performance.

[0003]

The problem to be solved by the present invention is to provide a method for producing an adsorbent superior to activated carbon by using diatomaceous earth or the like.

[0004]

The invention according to claim 1 is such that powder such as diatomaceous earth is mixed with organic powder or organic liquid and activated by steam after carbonization by dry distillation. In the invention described in 2, the dry distillation carbonization step and the activation step are continuously performed using an externally heated rotary kiln.

[0005]

According to the invention described in claim 1, the powder or liquid organic matter is carbonized, and the carbonized gas invades into the pores of the diatomaceous earth to be carbonized and adhered, and the pore diameter is small.
There is an effect that the pore volume and the specific surface area are increased to improve the adsorption performance, and the invention described in claim 2 has an effect that the adsorbent can be efficiently produced.

[0006]

【Example】

First Example 85% by weight of Wakkanai diatomaceous earth and 15% by weight of peat from Sarobetsu were prepared. The diatomaceous earth was finely pulverized with an Aerofractron, and the dried product obtained by finely pulverizing peat was mixed with this to spray an appropriate amount of water. It was granulated to 1.0 to 3.0 mm with a pan type granulator and put into a rotary kiln.

The rotary kiln, as shown in FIG.
The inside of the furnace body 1 constructed of a heat-resistant material is divided into upper and lower parts by a rostrut 2 having a flame passage hole 3, and the upper part is an upper combustion chamber 4, and the lower part is a lower combustion chamber 6 having a burner and a chimney 11 It has become. In the upper combustion chamber 4, a cylindrical heating cylinder 12 penetrates the furnace body 1 and is arranged with a slight inclination on the right side, and a ring 13 fitted to the projecting ends on both sides is attached to the outside of the furnace body 1. The roller 15 is supported by a base 14 provided on the base and is rotatably driven.

At the center of the left end of the heating cylinder 12, the hopper 1
The supply cylinder 17 communicating with 6 is inserted, and the screw conveyor 18 is arranged in the supply cylinder 17, and the end of the heating cylinder 12 around the supply cylinder 17 has a slight gap with the supply cylinder 17. It remains closed by the end plate 19. A nozzle 27 for water injection is inserted in the center of the right end of the heating cylinder 12, and the periphery thereof is closed by an end plate 9 having a spiral discharge port 8. The inside of the heating cylinder 12 is partitioned by a partition wall 20 in a substantially central portion, and the left side is divided into a first zone 21 and the right side is divided into a second zone 22, and an inlet 24 is provided on the outer periphery of the heating cylinder 12. Is spirally wound around the first zone 21, and the article-to-be-fired passage 23 whose outlet 25 is opened to the second zone 22 is wound in a spiral shape. Furthermore, the peripheral wall of the heating cylinder 12 is attached to the first zone 21. A through cylinder 26, which penetrates and communicates with the upper combustion chamber 4, has a bent inner end fixed with the axis of the heating cylinder 12 facing.

The granulated material charged into the hopper 16 of the rotary kiln is fed to the first zone 21 of the heating cylinder 12 through the inside of the supply cylinder 17 by the rotation of the screw conveyor 18, and the reducing atmosphere at 800 ° C. for 6 minutes. The dry distillation gas generated by being heated and dry-distilled at was jetted from the through cylinder 26, ignited and burned. The granulated material in which the organic matter was carbonized by the dry distillation was sent to the second zone 22 kept at 800 ° C. through the article feed passage 23. In the second zone 22, water was injected from the nozzle 27, and the injected water became steam and contacted with the carbonized particles to remove tar and activate it. The activated granules were discharged from the spiral discharge port 8 of the heating cylinder 12. The surface of the discharged granules was gray black or black, and the core was black.

Second Example Wakkanai diatomaceous earth finely pulverized with Aerofractron was put into a pan-type granulator, and a solution of 60% waste molasses and 40% water was sprayed to obtain a particle size of 1.0 to 3.0 mm. A black, moist granulate was obtained.
This granulated product was subjected to carbonization and activation by dry distillation using a rotary kiln under the same conditions as in the above-mentioned first embodiment to obtain particles of grey-black color.

Third Embodiment 3 Kg of scallop scallop (internal component from which the scallops were removed) was placed in a mixer and crushed into a paste, and 6 Kg of diatomaceous earth powder was added to this paste and placed in an Eirich mixer and mixed. While granulating to 1-5 mm. This granulated product was continuously subjected to dry distillation carbonization and activation in a rotary kiln as in the first embodiment. A product was obtained in which the surface of the grains was dark black and the center was black, and was light. There was no burning odor of the uro during burning, and the burning odor was deodorized in the furnace.

Comparison The granules of the above-mentioned first, second and third examples, the burned material of Wakkanai diatomaceous earth powder alone and the activated charcoal shell were each put in a mortar and crushed to 0.5 mm or less, and the funnel. A filter paper was laid and filled therein, and an aqueous solution of green bamboo, which is a dye manufactured by Hodogaya Chemical Co., Ltd., was poured into the filter paper, and the color of water filtered by a beaker was compared. The aqueous solution of green bamboo had a dark black blue color similar to that of the ink.

First Example: Colorless Transparent Second Example: Colorless Transparent Third Example: Colorless Transparent Wakkanai diatomaceous earth calcined matter ・ ・ ・ Blue palm shell activated carbon ・ ・ ・Light blue As a result, peat was mixed with Wakkanai diatomaceous earth and carbonized by carbonization and activated, and activated first example and waste molasses mixed with Wakkanai diatomaceous earth and carbonized by dry distillation and activated, second example and scallop of Wakkanai diatomaceous earth It was found that the third embodiment activated by mixing the uro paste with carbonization by carbonization and activated by distillation was remarkably excellent in filtration performance as compared with a calcined product of diatomaceous earth or palm shell activated carbon which was conventionally used as a filtering agent.

In the first embodiment, organic powder such as coconut shell, coffee bean pomace, and pulp sludge is used in place of the peat powder, and in the second embodiment, waste molasses is used. Similar results were obtained by using an organic liquid such as pulp waste liquid or tar instead.

Similar results were obtained by replacing Wakkanai diatomaceous earth of the second embodiment with sepiolite or zeolite.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a rotary kiln used for carrying out the present invention.

[Explanation of symbols]

1: Furnace body 12: Heating cylinder 20: Partition wall 21: First zone 22: Second zone 27: Nozzle

Claims (2)

[Claims] 1. A pulverized product of a mineral having a large pore volume and a large specific surface area, such as diatomaceous earth, sepiolite and zeolite,
A method for producing an adsorbent, which comprises mixing with an organic powder or an organic liquid, carbonizing by dry distillation, and activating with steam. 2. The method for producing an adsorbent according to claim 1, wherein the carbonization step and the activation step are continuously performed using an externally heated rotary kiln.