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Method for producing activated carbon by pyrolysis of salix twigs

A technology for the production of activated carbon and activated carbon, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of waste of resources, environment, pollution, etc., to increase added value, reduce manufacturing costs, and achieve harmless treatment. Effect

Inactive Publication Date: 2015-08-19
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the salix twigs after stubble were mainly burned as fuelwood, and the burning of a large amount of salix will cause serious waste of resources and environmental pollution
[0003] At present, the utilization of Salix salix branches after stubble is mainly concentrated in papermaking and wood-based panels. However, the dense structure and large quantity of Salix salix branches are ideal raw materials for the production of activated carbon, wood vinegar, tar and wood gas by wood pyrolysis. There is no report on this so far

Method used

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  • Method for producing activated carbon by pyrolysis of salix twigs
  • Method for producing activated carbon by pyrolysis of salix twigs
  • Method for producing activated carbon by pyrolysis of salix twigs

Examples

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Effect test

Embodiment 1

[0036] A method for pyrolyzing salix twigs to produce activated carbon, comprising the following steps:

[0037] (1) Raw material preparation and program setting stage: After removing impurities from Salix twigs, air-dry or dry them and then crush them, then crush them to a certain size (the crushing specification can be selected as less than 18-mesh standard sieve). Put it into the rotary kiln, close the feeding port, and set the heating rate and temperature range of the rotary kiln. Among them, the first stage: the heating rate is 1°C / min, and the temperature range is 0-600°C; the second stage: the carbon activation temperature is 700°C, the heating rate is 1°C / min, and the holding time is 5h; the third stage: stop heating and start Cool down program.

[0038] (2) Pyrolysis and reactant collection stage: According to the temperature setting of the first stage, after the carbonization is completed, CO is introduced 2Gas activator, the flow rate is set to 15L / h, the gas pres...

Embodiment 2

[0041] A method for pyrolyzing salix twigs to produce activated carbon, comprising the following steps:

[0042] (1) Raw material preparation and program setting stage: After removing impurities from the willow wood, air-dry or dry it and crush it, put the sawdust material crushed to a certain size into the rotary furnace, close the feeding port, and set the The heating rate and temperature range of the converter. Among them, the first stage: the heating rate is 15°C / min, and the temperature range is 0-500°C; the second stage: the heating rate is 10°C / min, the carbon activation temperature is 800°C, and the holding time is 4h; the third stage: stop heating and start Cool down program.

[0043] (2) Pyrolysis and reactant collection stage: according to the temperature setting of the first stage, after the carbonization is completed, the gas activator CO is introduced 2 , the flow rate is set to 50L / h, the gas pressure inside the rotary furnace is less than 0.40MPa, the rotatin...

Embodiment 3

[0046] A method for producing activated carbon by pyrolysis of salix twigs, comprising the following steps:

[0047] (1) Raw material preparation and program setting stage: After removing impurities from the willow wood, air-dry or dry it and crush it, put the sawdust material crushed to a certain size into the rotary furnace, close the feeding port, and set the The heating rate and temperature range of the converter. Among them, the first stage: the heating rate is 15°C / min, and the temperature range is 0-1200°C; the second stage: the carbon activation temperature is 1200°C, and the holding time is 1h; the third stage: stop heating and start the cooling program.

[0048] (2) Pyrolysis and reactant collection stage: According to the temperature setting of the first stage, after the carbonization is completed, the gas activator CO is introduced 2 , the flow rate is set to 90L / h, the gas pressure inside the rotary furnace is less than 0.40MPa, the rotating speed of the rotary f...

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Abstract

The invention discloses a method for producing active carbon from salix mongolica branches through pyrolysis. The method comprises the following steps of: a, removing impurities salix mongolica branches, air-drying or drying and crushing the salix mongolica branches after impurity removal; b, placing the crushed salix mongolica branches in a rotary furnace, carbonizing the salix mongolica branches under a protective gas; c, introducing a gas activating agent for activating after the carbonizing; and d, taking the activated active carbon out from the rotary furnace, rinsing, screening, detecting, and finally packaging to obtain an active carbon finished product. The active carbon is produced by using the salix mongolica branches as raw materials, and thus a large quantity of waste branches in the process of norusihing the salix mongolica shrubwood is utilized. The raw materials for preparing the active carbon are easily available, and are low in cost. The active carbon is produced from the salix mongolica lopsticks, and thus the salix mongolica lopsticks are recycled, the production cost of the active carbon is lowered, the new variety of the active carbon is developed, the comprehensive development and utilization of the salix mongolica can be promoted, and the development space of the active carbon industry is enlarged.

Description

technical field [0001] The invention relates to the technical field of biomass pyrolysis, in particular to a method for producing activated carbon by pyrolyzing salix stalks. Background technique [0002] Salix salix is ​​a high-quality sand-growing shrub for wind and sand fixation in my country. It has the characteristics of drought resistance, cold resistance, high temperature resistance, desert resistance, sand burial resistance, wind erosion resistance, easy reproduction, and fast growth. Generally speaking, Salix shrubs grow close to the ground, with strong clustering, many branches, and high density. The average diameter of three-year-old Salix branches can reach 2-3cm, and the height is more than 3m. The branches of Salix must be planted every 3-4 years. If it is stubbled once, more new branches will be issued in the second year, otherwise it will naturally decay and die. In recent years, due to the strengthening of sand control efforts by the state and the implement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/10C01B32/336
Inventor 朱铭强苏印泉朱亚红尉芹段义忠亢福仁任米燕冯光惠
Owner NORTHWEST A & F UNIV
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