Chlorine component dry recovery process for co-processing chlorine-containing solid waste based on cement kiln

Abstract

The invention discloses a chlorine component dry recovery process for co-processing chlorine-containing solid waste based on a cement kiln, and solves the problems of long flow, high energy consumption, high equipment investment and operation cost and environmental pollution in the traditional wet processing of chlorine-containing components. According to the technical scheme, solid waste containing chlorine components enters a cement production line, under the high-temperature environment in a rotary kiln, the chlorine-containing components are gasified and enter flue gas, part of the flue gas is led out from a kiln head flue gas cover of the rotary kiln, and the led-out part of the flue gas is fed into a cooling tower after being subjected to dry dust removal and directly exchanges heat with potassium chloride powder materials for cooling; chlorine-containing components in the flue gas are condensed and enter the potassium chloride powder material, the flue gas after heat exchange is discharged from the top of the cooling tower, and the potassium chloride powder material after heat exchange is discharged from the bottom of the cooling tower. The method is simple in process, low in investment cost and operation cost, environment-friendly, energy-saving and consumption-reducing, and capable of effectively recovering the potassium chloride product.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and relates to a resource recovery process of potassium chloride when cement kilns co-process chlorine-containing solid waste, specifically a dry recovery method for chlorine components based on cement kiln co-processing chlorine-containing solid waste craft. Background technique [0002] In the "Industrial Structure Adjustment Catalog" revised and released by the National Development and Reform Commission in 2019, the co-processing of fly ash in cement kilns is listed as the first item in the building materials encouragement category. Fly ash comes from municipal waste incineration power plants, and is a typical hazardous waste containing chlorine components (potassium chloride + sodium chloride), with a chlorine content of 10% or even higher [Zhang Lei, Zhang Yunze. Separation of sodium and potassium salts in The application of fly ash cement kiln co-processing line. Salt Science and Chemi...

AI Technical Summary

Problems solved by technology

[0019]2) There is a risk of secondary pollution of waste liquid in the wet process

[0020]3) Large investment, high operating cost and high energy consumption

The treatment process includes water washing / pickling, crystallization separation, drying and other operating units, especially the solid phase residue after wet chlorine extraction needs to be dried before entering the cement production unit. The entire treatment process has many operating units, high energy consumption, and large investment. high operating costs

[0021]4) High chlorine content in cement clinker

However, remixing cement clinker will lead to an increase in the content of chlorine components in cement after all. At the same time, there are still a large number of soot particles that do not participate in the firing reaction process of cement clinker. The addition of these components will have a negative impact on the quality of cement products. have a certain impact

Also lead to the waste of potassium chloride resources

[0022] In order to solve the problems of high separation cost of chlorine-containing components and high risk of secondary environmental pollution in the co-processing of chlorine-containing waste in cement rotary kiln, the co-processing of cement rotary kiln is improved. The efficiency of chlorine-containing wastes urgently requires the development of new technologies with no secondary pollution, low operating costs, and low investment

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