Activated carbon preparation method of sludge type argillaceous biomass

Abstract

The invention discloses an activated carbon preparation method of a sludge type argillaceous biomass. The method comprises: carrying out a process of constructing and conditioning micro-explosion agent/aggregate, a process of solar sandwich drying and a process of activation two-stage pyrolysis; uniformly mixing the sludge obtained after dehydration of the sludge type argillaceous biomass, the micro-explosion agent and the aggregate in a mass ratio of 8.5:0.5:1.0-6:2:2 of a dry basis, then carrying out distribution, carrying out drying in a solar sandwich drying system, then carrying out two-stage pyrolysis in a pyrolysis furnace, controlling the temperature of the initial carbonization stage at 230 DEG C for 20 minutes, then raising the temperature to 400 DEG C at a rate of 20-40 DEG C/min, making a stop for 30-60minutes, and introducing water vapor into a water vapor activation stage at a flow rate of 0.1-1L/(min.G), wherein the pyrolysis final temperature is 550-650 DEG C, the residence time is 20-60 minutes, the EET of the formed activated carbon is 200-500m2/g, and the particle size is less than 20mm; and the micro-explosion agent is one or more of ammonium nitrate, potassium ammonium nitrate and calcium ammonium nitrate, and the aggregate is a waste circuit board. The preparation method disclosed by the invention comprehensively uses solar drying, micro-explosion agent swelling pore-forming and waste resin to construct a framework, and thereby improving the solar drying efficiency of the sludge and the quality of the activated carbon.

Description

technical field [0001] The invention relates to a method for realizing recycling of solid waste, in particular to a method for preparing activated carbon from sludge-like argillaceous biomass, which belongs to the technical field of environmental protection. Background technique [0002] With the continuous improvement of my country's urban sewage treatment rate, the sludge output of urban sewage treatment plants has also increased sharply. As of the end of June 2013, 3,479 urban sewage treatment plants have been built nationwide, with a sewage treatment capacity of about 120 million cubic meters per day. The most direct result of the large-scale construction and operation of sewage treatment plants is the substantial increase in sludge output. It is predicted that by 2015, the annual production of wet sludge (with a water content of 80%) in urban sewage treatment plants will reach 33.59 million tons, that is, 92,000 tons of sludge per day. At present, only a small part of...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the low quality of activated carbon in the existing process of preparing carbon from sludge, which cannot meet the shortcomings of subsequent resource utilization, and to provide a method for preparing activated carbon from sludge-like argillaceous biomass, using a micro-explosive agent The puffing effect of the sludge will not reduce the volume too much during the drying process, and at the same time, the micro-explosive agent will decompose and release a large amount of gas in the process of pyrolysis carbon production to make pores, so that the generated gas will condense with the carbon substances in the sludge to Increase the follow-up sludge carbon yield to achieve the effect of improving the quality of sludge carbon, cheap and good quality, simple process, and high carbon quality, thereby greatly improving social and economic benefits

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