CN1019474B

CN1019474B - Method for making active carbon from cocoanut shell

Info

Publication number: CN1019474B
Application number: CN90103816A
Authority: CN
Inventors: 周念庵
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-05-22
Filing date: 1990-05-22
Publication date: 1992-12-16
Also published as: CN1047838A

Abstract

The present invention belongs to the technical field of the preparation of active carbon, which discloses a preparation method using coconut residues as raw materials. The screening of the raw materials and the soakage for a long time after mixture are omitted, and after mixed, the coconut residues and chemical activating agents, namely zinc chloride, can be directly carbonized and activated; then, active carbon products are prepared by recovery, acid boil, sand wash, chlorine bleaching, drying, ball milling, packaging, etc. The coconut residue raw materials used by the preparation method are waste not developed and utilized at present, the environment pollution of coconut processing plants is solved, and the comprehensive utilization of coconuts is also increased.

Description

Method for making active carbon from cocoanut shell

The invention belongs to the manufacturing technology field of gac, be specifically a kind of be that raw material is produced process of active carbon with the coconut palm slag.

Producing in the prior art of gac; the raw material of normal employing is wood chip, sawdust, coconut inner casing; with dense liquor zinci chloridi is activator; the activation of employing superheated vapo(u)r; produce gac; the disclosed production method of document CA92:83170d is just belonging to this type of; its method must be through raw material and dense liquor zinci chloridi the are long-time operations such as charing, activation of being allowed for access after soaking; many, the time-consuming length of operation; this kind method is along with the protection to the forest reserves; raw material sources are shortage gradually, and raw materials cost also improves day by day.It is raw material with vinasse that document CN88102767 discloses a kind of, make process of active carbon with zinc chloride process, this method has been saved raw material and the mixed long-time immersion of activator zinc chloride, but because the raw material vinasse are sticking mashed prod, must be through the cleaning of certain operation, can with activator mix, and the consumption of zinc chloride is also bigger, the silica treatment inconvenience that produces in the production process, the decolorizing ability of the product activation charcoal of producing by this method is also not ideal enough, and cost is higher.

The object of the present invention is to provide a kind of is raw material with the coconut palm slag, adopts new manufacture method, saves the screening of raw material and the gac manufacture method of the operations such as long-time immersion after the batching; Reduce facility investment, shorten operation and time, reduce the production cost of gac.With the coconut palm slag is that raw material is produced gac, at home and abroad still belongs to the first time.

The coconut palm slag is a kind of waste that scrapes during with coconut palm clothing processing coconut palm palm fibre, and its matter is soft, particle is little, is the waste of end development and use still at present, along with the continuous expansion of southern coconut cultivated area, and coconut processing industry growing, the processing of coconut palm slag is anxious to be solved.The present invention is achieved in that coconut palm slag and chemical activating agent solid zinc chloride in 100 with coconut palm slag preparing active carbon: the ratio of 50-100 prepares, add the liquor zinci chloridi that degree Beaume is 45-50 again, add-on is 100 in raw material and solution: the ratio of 100-200 adds, and solution is to be that potential of hydrogen is transferred to pH value is 4-6's for hydrochloric acid below 5% with concentration; Coconut palm slag and activator batching is except aforesaid method in addition, also can adopt coconut palm slag solution direct and the activator zinc chloride to join even, its strength of solution and add-on can be regulated according to the ratio of coconut palm slag and zinc chloride content 100: 250-300, equally, this solution also must transfer to pH value 4-6 with the hydrochloric acid below 5%.Just can directly drop into charing with the coconut palm slag after the chemical activating agent batching, the used time of charing operation is 1.5-2.5 hour, enters activating chamber then and carries out 1.5-2.5 hour activation, obtains activating charcoal; The activation charcoal is again through reclaiming, and boils with the acid that the hydrochloric acid of 5-10% carried out 3-4 hour, washes sand, 8-10 hour float chlorine, dry at last with 5-6 hour ball milling and just can obtain gac.By method of the present invention, the used time of each production process all shortens to some extent than old technology, equipment used can be used the production unit in the old technology, do not need to purchase again or transform, by method of the present invention, during oven dry, on the basis of adopting original flattening oven oven dry or converter drying, cloth bag oven dry or cloth bag sealing means have been added, prevent the loss of flying upward of powdered carbon, its operation is achieved in that when drying with flattening oven first controlled temperature is dried under 100 ℃-120 ℃, when dry by the fire be 25-35% to water content after, the cloth bag of just powdered carbon being packed into is to dry under 70 ℃-80 ℃ the low temperature in temperature; When using converter drying, then adopt cloth bag to seal and dry.

Effect of the present invention:

The present invention is a raw material with the coconut palm slag, adopt new manufacture method to save the screening of raw material and the long-time immersion operation after the batching, making the manufacturing production of gac has had new raw material sources, has simplified operation, reduced facility investment, shortened the production cycle, reduced production cost, assessed the cost and reduce more than 20% than wood chip working system, the every the key technical indexes of prepared gac all reaches standard-required, and decolorizing ability is improved largely than the gac of wood chip manufacturing.And because the development and use of coconut palm slag, the waste residue that had both solved coconut source mill is handled, and has increased the comprehensive utilization of coconut again.

Be embodiments of the invention below:

Getting coconut palm slag (wetting) 500 grams fully mixes thoroughly with solid zinc chloride 200 grams, the adding degree Beaume is 45 liquor zinci chloridi 500 grams, it is 4 that hydrochloric acid with 4% transfers to pH value, directly carry out 2 hours charing then, change activating chamber over to, on 2 hours intermittence, under stir activation, i.e. discharging must activate charcoal 480 gram, then through reclaiming, the acid of carrying out 4 hours with 10% hydrochloric acid is boiled, wash sand, 8 hours float chlorine, on flattening oven, dry then, after drying water content 30%, the cloth bag of packing into, in temperature is to carry out oven drying at low temperature under 70 ℃, carries out 5 hours ball milling at last, just obtains finished product gac 100 grams.

The gac of gained is through chemical examination, and its key technical indexes is as follows:

Decolorizing ability (A method caramel colour): 150% loss on drying: 9%

PH value: 4.5 contain molysite: 0.11%

Chloride: 0.20% ignition residue: 4.20%

Claims

1, a kind of manufacturing process of active carbon, this method comprise that carbon raw material and zinc chloride are mixed in proportion, carbonization afterwards, activation, reclaim, acid is boiled, and washes sand, float chlorine, dry by the fire in the ball milling operation, it is characterized in that coconut palm slag and solid zinc chloride are by 100: the weight ratio of 50-100 prepares; Add the liquor zinci chloridi that degree Beaume is 45-50 again, add-on is 100 by coconut palm slag and solution: the weight ratio of 100-200 adds.

2, a kind of manufacturing process of active carbon, this method comprises that carbon raw material and zinc chloride are mixed in proportion, carbonization afterwards, activation is reclaimed, acid is boiled, wash sand, float chlorine, oven dry and ball milling operation, it is characterized in that the coconut palm slag directly mixes with liquor zinci chloridi, the concentration of liquor zinci chloridi and add-on are regulated by the weight ratio of coconut palm slag and zinc chloride content 100: 250-300.

3, method according to claim 1 and 2, the potential of hydrogen that it is characterized in that used liquor zinci chloridi all are to transfer to pH value 4-6's with concentration less than 5% hydrochloric acid.

4, method according to claim 1 and 2, the used time of each production process after it is characterized in that preparing burden is: charing 1.5-2.5 hour, activation 1.5-2.5 hour, acid boil 3-4 hour, float chlorine 8-10 hour, ball milling 5-6 hour.

5, method according to claim 1 and 2 is characterized in that it is the hydrochloric acid of using 5-10% that acid is boiled.

6, method according to claim 1 and 2 is characterized in that being controlled at earlier when drying with flattening oven under 100 ℃-120 ℃ the temperature and dries to water content 25-35%, the cloth bag of packing into, and temperature is controlled under 70 ℃-80 ℃ and dries.