Environment-friendly snow melting agent prepared from alkaline residues and preparation method therefor

A snow-melting agent and environmental protection technology, applied in the field of environmental-friendly snow-melting agent and its preparation, can solve the problems such as the difficulty of using alkali slag, and achieve the effects of less secondary pollution, lower production costs, and better snow melting

Inactive Publication Date: 2015-12-02
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that alkali slag is difficult to use, and provide an environmentally friendly deicing agent prepared by using alkali slag and its preparation method

Method used

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  • Environment-friendly snow melting agent prepared from alkaline residues and preparation method therefor
  • Environment-friendly snow melting agent prepared from alkaline residues and preparation method therefor
  • Environment-friendly snow melting agent prepared from alkaline residues and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides an environmentally friendly deicing agent prepared from alkali slag, including a solid product reacted with alkali slag and hydrochloric acid as raw materials.

[0040] This embodiment also provides a preparation method for the solid product, including slowly adding concentrated hydrochloric acid into a reaction tank with alkali slag under stirring conditions, and reacting after 5-6 hours, detecting the pH; The slag and concentrated hydrochloric acid adjust the pH in the reaction tank to 7-8, stop the reaction, and obtain a suspension reaction solution, then carry out vacuum filtration at a vacuum degree of 20kPa, evaporate and dry to obtain a solid product. The solid product can be directly used as an environment-friendly deicing agent.

[0041] During the reaction, carbon dioxide, a by-product of the reaction, is recovered.

[0042] Its reaction formula is:

[0043] CaCO 3 +2HCl=CaCl 2 +H 2 O+CO 2 ↑

[0044] Ca(OH) 2 +2HCl=CaCl 2 +2H ...

Embodiment 2

[0049] This example provides an environmentally friendly deicing agent prepared by using alkali slag, including 75g of solid product prepared according to the method in Example 1, 15g of urea, and 10g of sodium nitrite. It can be prepared by mixing the above components evenly.

Embodiment 3

[0051] This example provides an environmentally friendly deicing agent prepared by using alkali slag, including 85g of solid product prepared according to the method in Example 1, 10g of urea, and 5g of sodium nitrite. It can be prepared by mixing the above components evenly.

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PUM

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Abstract

The present invention relates to an environment-friendly snow melting agent prepared from alkaline residues and a preparation method therefor. The environment-friendly snow melting agent comprises a product obtained by a reaction which takes the alkaline residues and acid as raw materials, and preferably comprises one or more of urea, sodium nitrite and magnesium acetate. The preparation method for the product comprises: under a condition of stirring, adding the acid to a reaction tank with the alkaline residues and performing reaction; adjusting the pH value of a reaction system to 7-8 by use of the alkali residues or the acid so as to obtain suspended reaction liquor, and filtering the suspended reaction liquor to obtain the product. The present invention firstly discloses the environment-friendly snow melting agent which is prepared by taking the alkali residues and the acid as raw materials, solves the alkali residue treatment problem, improves the economic value of the alkali residues, and obtains a byproduct carbon dioxide. The method disclosed by the invention is simple and easy to implement. The environment-friendly snow melting agent prepared by the method is good in effect and, green and environmentally friendly; and the production cost of the snow melting agent is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of chemical waste slag and chemical production, and in particular relates to an environment-friendly deicing agent prepared by using alkali slag and a preparation method thereof. Background technique [0002] Snow melting agent (road freezing prevention agent) is mainly used for road, airport, port, city street winter snow removal and road antifreeze. There are generally two types of snow melting agents used at home and abroad: one is the snow melting agent with acetate as the main component. This kind of snow melting agent has good snow melting effect and no corrosion damage, but its price is high, and it is generally used in airports, etc. important place. The other type is deicing agent with "chloride salt" as the main component, such as sodium chloride, calcium chloride, magnesium chloride, potassium chloride, etc., usually called "icing salt". The main domestic environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/18
Inventor 王肇嘉杨飞华刘博郭建平
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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