CN102001654A - Method for making electrode carbon by using bamboo powder - Google Patents

Abstract

The invention relates to a method for making electrode carbon by using bamboo powder, belonging to a production method of nonmetallic elements, in particular to a production method of electrode carbon. The method comprises the following five steps of: firstly, sorting, drying and pulverizing; secondly, placing raw materials in a kiln; thirdly, carbonizing; fourthly, activating; and fifthly, carrying out acid washing, water washing and drying. The specific surface area of the activated carbon produced in the method is 1002-1300 m<2>/g, the adsorption value of iodine is 900-10000 mg/g, and the adsorption value of methylthionine chloride is 19.5-21 ml/g, thereby the activated carbon accords with the indication requirements as the electrode carbon for capacitors.

Description

Make the method for electrode carbon of the bamboo powder

Technical field

The present invention relates to a kind of process of active carbon of using with bamboo processing residue material making electrode for capacitors.

Background technology

CN1382625A, CN101117219A disclose " a kind of process for preparing activated carbon from bamboo " and " with the method for bamboo making capacitor special-purpose activated charcoal " two patented technologies respectively, the common technical characterstic is to adopt former bamboo intercept to burn till the bamboo charcoal reactivate to become gac, and adopt KOH and NaoH to make the chemical activation method of activator, cause environmental pollution.Though last patent do not adopt chemical activating agent, the surface-area of making gac only is 500-800cm ²/ g, quality is not good enough.Make the raw materials cost height with former bamboo, the residuum of former bamboo processing as bamboo sawdust, the broken thin bamboo strip, assorted silk, ring piece, short material etc., is piled up at processing stand, almost becomes a kind of burden, still underuses.

Summary of the invention

At the above-mentioned deficiency of prior art, the technical problem to be solved in the present invention is to utilize the residue material of former bamboo processing, without chemical activating agent, designs a kind of method of making electrode carbon of the bamboo powder.

The technical scheme that solves the problems of the technologies described above is: the method that this usefulness bamboo powder is made electrode carbon is to adopt following steps:

(1) select materials, dry with pulverize: selecting former bamboo to process remaining ring piece, the broken thin bamboo strip, short bamboo chip, bamboo silk is raw material, is dried to water ratio 10%-15%, pulverizes the bamboo powder into particle diameter 1-5mm, single or consider to be worth doing to mix with the saw bamboo and make the charcoal processing raw material;

(2) raw material is gone into kiln: bamboo powder that step (1) is made and/or saw bamboo bits are packed into and are had in the carbonizing kiln of porous steel substrate, shut closing door;

(3) carry out charing: the fuel ignition in burner hearth is also controlled the kiln temperature, and with the control of control fuel quantity, air output realization kiln temperature, the thermocouple thermometric is observed, carbonization temperature 500-1000 ℃;

(4) activate: the bamboo charcoal powder made from step (3) is a raw material, be incorporated with in the carbonizing kiln of porous steel substrate, shut closing door, point is fought and is controlled the kiln temperature, activation temperature 800-1000 ℃, heat-up rate 5-20 ℃/min, the flue gas that only depends on fuel combustion during this time and produced, or feed water or aerating oxygen or bubbling air in addition, back three's feeding amount is by bamboo charcoal powder per ton per hour, be respectively 0.5-0.6kg, 0.2-0.7kg, 0.6-2kg, carry out getting in physically activated 2-6 hour gac;

(5) pickling, washing and oven dry: step (4) gained gac is carried out pickling, is washed to neutrality, and oven dry promptly gets this electrode carbon.

The invention has the beneficial effects as follows that raw materials cost is low, reactivation process can not produce the pollution of chemical activating agent to environment, and gac specific surface area, iodine sorption value, the methylene blue adsorption value made are higher, meets to make the electrode for capacitors requirement.

Embodiment

The present invention is described in further detail below in conjunction with embodiment: the drying of present method in step (1) is to pulverize the needs of raw material, also is the needs that carry out charing.The particle diameter of pulverizing is that 1-5mm is based on the particle diameter of saw bamboo powder and the fineness degree of bamboo silk is considered, mix when making raw material, the unanimity relatively of particle diameter, processing parameter and product performance being stablized favourable, otherwise is raw material with ring piece, short bamboo chip, does not pulverize, with the activation of making charcoal of the approaching bulk material of size, its specific surface area surpasses the powder-material active bamboo, but this has surpassed the limited range of present patent application, does not give unnecessary details.The carbonizing kiln that present method adopts is the heat heat supply near the flue part of burner hearth, separate by stephanoporate steel plate between bamboo powder in the carbonizing kiln and the flue, exceeding with the bamboo powder that do not fall in its aperture, can adopt the rebasing method of coarse grain bamboo powder or powdered carbon to solve the contradictory problems of anti-fall powder (charcoal) and increasing breather hole.Make charcoal and activatory temperature control by observing thermoelectric consumption value and seeing that dark brown is for referencial use in conjunction with handling.Feed water, oxygen, nitrogen, air in addition to carbonizing kiln during activation, need at other water source or the gas cylinder established of kiln, in pipe feeds kiln.Because of present method is not made activator with NaoH, KOH, few during pickling with acid.The feeding amount of water, oxygen, air can be controlled by rate of flow meter and the combination of activatory time.In addition water flowing, oxygen and air, only depend on flue gas be because of charring furnace just sealing be not airtight, a certain amount of air admission is arranged itself, can not feed gas in addition.

Claims (1)

1. method of making electrode carbon with the bamboo powder is characterized in that adopting following steps:

(1) select materials, dry with pulverize: selecting former bamboo to process remaining ring piece, the broken thin bamboo strip, short bamboo chip, bamboo silk is raw material, is dried to water ratio 10%-15%, pulverizes the bamboo powder into particle diameter 1-5mm, single or consider to be worth doing to mix with the saw bamboo and make the charcoal processing raw material;

(2) raw material is gone into kiln: bamboo powder that step (1) is made and/or saw bamboo bits are packed into and are had in the carbonizing kiln of porous steel substrate, shut closing door;

(3) carry out charing: the fuel ignition in burner hearth is also controlled the kiln temperature, and with the control of control fuel quantity, air output realization kiln temperature, the thermocouple thermometric is observed, carbonization temperature 500-1000 ℃;

(4) activate: the bamboo charcoal powder made from step (3) is a raw material, be incorporated with in the carbonizing kiln of porous steel substrate, shut closing door, point is fought and is controlled the kiln temperature, activation temperature 800-1000 ℃, heat-up rate 5-20 ℃/min, the flue gas that only depends on fuel combustion during this time and produced, or feed water or aerating oxygen or bubbling air in addition, back three's feeding amount is by bamboo charcoal powder per ton per hour, be respectively 0.5-0.6kg, 0.2-0.7kg, 0.6-2kg, carry out getting in physically activated 2-6 hour gac;

(5) pickling, washing and oven dry: step (4) gained gac is carried out pickling, is washed to neutrality, and oven dry promptly gets this electrode carbon.