Novel method for improving city sludge active carbon performance

Abstract

The invention discloses a method for adopting city sewage processing factory residual sludge and natural ilmenite as raw materials, and for producing active carbon by using zinc chloride as an activating agent. The method comprises specific steps that: the raw material sludge is dried until the water content of the sludge is below 10%; the sludge is mechanically crushed, and is sieved by using a sieve of 120 meshes; ilmenite is crushed, and is sieved by using a sieve of 200 meshes; the ilmenite is added into the raw material sludge with a proportion of 1.5-2%, and the mixture is well mixed; the pretreated raw material sludge is impregnated in a zinc chloride solution with a concentration of 3mol/L under normal temperature for 24h; and the impregnated sludge is dried by baking under a temperature of 80 DEG C for 24h, wherein a solid-liquid ratio (a ratio of the mass of the sludge to the volume of the zinc chloride solution) is 1:2; the bake-dried sludge is placed in a tube furnace (a heating speed is 10 DEG C/min, N2 is adopted as a protective gas, and a flow rate is 30L/h), the temperature is increased to 525-550 DEG C, and further carbonization is carried out for 40-60min (carbonization and activation are carried out simultaneously); the activated carbonized product is cooled to room temperature, and is washed by using a hydrochloric acid solution with a concentration of 3mol/l; the product is rinsed by using water with a temperature of 70-80 DEG C, until the product is neutral; the rinsed product is dried by baking, and is grinded, such that the active carbon finished product can be obtained.

Description

technical field [0001] The invention relates to a new method for producing active carbon products by using surplus sludge from urban sewage treatment plants as raw material, adding ilmenite as a pore-forming agent, and using zinc chloride as an activator. Background technique [0002] Activated carbon is widely used in chemical, biotechnology, food, medicine, national defense, environmental protection, energy and almost all scientific research and national economic sectors as well as people's daily life, and the application area is getting wider and wider, and the demand is growing steadily year by year. The raw materials for preparing activated carbon include wood, coke, petroleum coke, fruit shells, crop straw, synthetic fibers, coal and plastics. In order to protect the living environment of human beings, traditional raw materials for activated carbon production are subject to more and more restrictions. How to expand the source of raw materials for the production of acti...

AI Technical Summary

Problems solved by technology

These organic and harmful substances are unstable and perishable. If they are not handled properly, they will cause serious environmental pollution and waste of resources.

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