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A kind of chemical heating material based on iron-containing sludge and preparation method thereof

A heating material and chemical technology, applied in the field of chemical heating material based on iron-containing sludge and its preparation, can solve the problems of high cost and low resource utilization of Fenton sludge, and achieve low production cost, good practical value and The effect of promoting application value and full utilization of resources

Active Publication Date: 2022-07-01
上海明奥环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a chemical heating material based on iron-containing sludge and its preparation method in view of the problems of low resource utilization of Fenton sludge, high cost and easy generation of secondary waste.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The present embodiment provides a method for preparing a chemical heating material by utilizing the Fenton sludge of a paper mill in Shanghai, comprising the following steps:

[0040] (1) After the calcium chloride and hydrochloric acid are mixed in proportion, they are added to the Fenton sludge of a paper mill in Shanghai, kneaded evenly with a kneader, and the pH value of the sludge is adjusted by controlling the addition amount of the calcium chloride and hydrochloric acid mixture It is controlled between 5 and 6; the concentration of calcium chloride solution is 30%, the concentration of hydrochloric acid solution is 30%, and the ratio of calcium chloride and hydrochloric acid is 1:1; the pH of the mixed solution of calcium chloride and hydrochloric acid is 1, and the sludge The pH is 5.

[0041] (2) Dry and pyrolyze the kneaded sludge; wherein, the drying temperature is 80°C, the time is 2h, the high-temperature pyrolysis temperature is 700°C, and the residence ti...

Embodiment 2

[0044] The present embodiment provides a method for preparing a chemical heating material by utilizing the Fenton sludge of a printing and dyeing factory, comprising the following steps:

[0045] (1) After the potassium chloride and hydrochloric acid are mixed in proportion, they are added to the Fenton sludge of a printing and dyeing factory in Shanghai, kneaded evenly with a kneader, and the pH value of the sludge is adjusted by controlling the addition amount of the potassium chloride and hydrochloric acid mixture It is controlled between 5 and 6; among them, the concentration of potassium chloride solution is 30%, the concentration of hydrochloric acid solution is 30%, and the ratio of potassium chloride and hydrochloric acid is 2:1; the pH of the mixed solution of potassium chloride and hydrochloric acid is 1.2, and the sludge The pH is 5.5.

[0046] (2) The kneaded sludge is dried and pyrolyzed; wherein, the drying temperature is 85°C, the time is 2h, the pyrolysis tempe...

Embodiment 3

[0049] The present embodiment provides a method for preparing a chemical heating material by utilizing the Fenton sludge of a certain urban sewage treatment plant, comprising the following steps:

[0050] (1) After the magnesium chloride and hydrochloric acid are mixed in proportion, they are added to the Fenton sludge of an urban sewage treatment plant in Shanghai, kneaded evenly with a kneader, and the pH value of the sludge is controlled at Between 5 and 6; wherein, the concentration of magnesium chloride solution is 30%, the concentration of hydrochloric acid solution is 30%, and the ratio of magnesium chloride and hydrochloric acid is 3:1; the pH of the mixed solution of magnesium chloride and hydrochloric acid is 1.5, and the pH of sludge is 6.

[0051] (2) The kneaded sludge is dried and pyrolyzed at high temperature; wherein, the drying temperature is 90°C, the time is 3h, the pyrolysis temperature is 800°C, and the residence time is 60min, and then the pyrolysis produc...

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PUM

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Abstract

The invention discloses a preparation method of a chemical exothermic material based on iron-containing sludge, comprising the steps of: (1) mixing hydrochloric acid and chloride salt in a mass ratio of 1:1-3, then adding it to the Fenton sludge, and kneading The kneading machine is evenly kneaded, and the pH value of the Fenton sludge is controlled to be 5-6; (2) the kneaded Fenton sludge is dried and pyrolyzed; (3) the cracked product is pulverized and ground to 80-100 After mixing with exothermic auxiliary materials, sealed and stored. The preparation method of the present invention utilizes the iron-containing sludge produced by the wastewater treatment of paper mills, printing and dyeing plants, urban sewage treatment plants receiving industrial wastewater, etc. through the processes of modulation and kneading, drying, pyrolysis, pulverization and grinding, mixed packaging, etc., and can be obtained at low cost. The chemical heating material with excellent product performance can be used to produce heating bags, warm stickers and other products; and the preparation process is simple, the production cost is low, the sludge resources are fully utilized, and the economic benefit is high.

Description

technical field [0001] The invention relates to the field of waste resource utilization and material preparation, in particular to a chemical heating material based on iron-containing sludge and a preparation method thereof. Background technique [0002] The papermaking process produces a large amount of waste water, usually a paper mill produces thousands to tens of thousands of tons of waste water every day. Papermaking uses wood pulp as raw material, and the main components are organic substances such as cellulose, lignin, and polysaccharides contained in natural plants. The amount of wastewater in printing and dyeing plants is relatively large, and 100-200 tons of water is consumed per 1 ton of textiles printed and dyed, of which 80-90% is discharged as wastewater. Printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, large alkalinity, and large changes in water quality, and is one of the difficult industrial w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/18
Inventor 甘琦徐晨康蒙蒙李飞
Owner 上海明奥环保科技有限公司