A method for preparing activated carbon from sludge-like argillaceous biomass

Abstract

A method for preparing activated carbon from sludge-like argillaceous biomass, including a micro-explosive agent / aggregate construction and conditioning process, a solar interlayer drying process, and an activated second-stage pyrolysis process; dehydrating the sludge-like argillaceous biomass Sludge, micro-explosive agent and aggregate are mixed evenly at a mass ratio of 8.5:0.5:1.0 to 6:2:2 on a dry basis, and then distributed, dried in a solar interlayer drying system, and then put into a pyrolysis furnace. Two-stage pyrolysis, the initial carbonization stage controls the temperature at 230°C, stays for 20 minutes, then raises the temperature to 400°C at a rate of 20-40°C / min, and stays for 30-60 minutes. In the steam activation stage, water vapor is introduced at a flow rate of 0.1-1L / (min g), the final pyrolysis temperature is 550-650°C, the residence time is 20-60min, the BET of activated carbon is 200-500m2 / g, and the particle size is <20mm; the micro-explosive agent is ammonium nitrate and ammonium nitrate One or more of potassium and calcium ammonium nitrate, and the aggregate is waste circuit boards. The invention comprehensively utilizes solar drying, micro-explosive agent puffing to form pores and waste resin to construct a skeleton, thereby improving the sludge solar drying efficiency and the quality of 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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