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A method for preparing calcium magnesium hydrochloride deicing agent by using lime flue gas method salt mud

A lime flue gas, calcium magnesium hydrochloride technology, applied in the field of environmental protection and solid waste resource utilization, can solve the problems of environmental pollution, complex components, large output, etc., to reduce production costs, reduce environmental pollution, The effect of improving usability

Active Publication Date: 2019-02-22
CHINASALT JINTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical components involved in the salt sludge produced by the lime flue gas brine purification process include CaCO 3 , Mg(OH) 2 , CaSO 4 And a small amount of NaCl, etc., due to the large output and complex composition, direct discharge will cause environmental pollution

Method used

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  • A method for preparing calcium magnesium hydrochloride deicing agent by using lime flue gas method salt mud
  • A method for preparing calcium magnesium hydrochloride deicing agent by using lime flue gas method salt mud
  • A method for preparing calcium magnesium hydrochloride deicing agent by using lime flue gas method salt mud

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The composition of the lime flue gas method salt mud used in the present embodiment is calculated as CaCO in parts by weight. 3 80.8 parts, NaCl 0.8 parts, Mg(OH) 2 13.2 parts, CaSO 4 2.8 parts, Fe(OH) 3 1.7 parts, Al(OH) 3 0.4 parts, SiO 2 0.3 parts,

[0022] (1) will contain 500g CaCO 3 The above-mentioned lime flue gas method salt mud was stirred and dispersed into a slurry in 500mL water at room temperature (25° C.), and then in the stirred state, hydrochloric acid with a solute mass fraction of 29% was added dropwise to the slurry until no bubbles appeared in the reaction system;

[0023] (2) Filtrating the reaction system obtained in step (1), and concentrating the resulting filtrate under reduced pressure at 0.06Mpa and 140°C;

[0024] (3) Transfer the concentrated solution obtained in step (2) to a fluidized bed spray granulation dryer for drying and granulation to obtain an environmentally friendly deicing agent with a particle size of 2-4mm and a n...

Embodiment 2

[0026] The composition of the lime flue gas method salt mud used in the present embodiment is calculated as CaCO in parts by weight. 3 80.8 parts, NaCl 0.8 parts, Mg(OH) 2 13.2 parts, CaSO 4 2.8 parts, Fe(OH) 3 1.7 parts, Al(OH) 3 0.4 parts, SiO 2 0.3 parts,

[0027] (1) will contain 500g CaCO 3 The above-mentioned lime flue gas method salt mud was stirred and dispersed into a slurry in 500mL water at room temperature (25° C.), and then in the stirred state, hydrochloric acid with a solute mass fraction of 29% was added dropwise to the slurry until no bubbles appeared in the reaction system;

[0028] (2) Filtrating the reaction system obtained in step (1), and concentrating the resulting filtrate under reduced pressure at 0.06Mpa and 140°C;

[0029] (3) transfer the concentrated solution obtained in step (2) to molasses (the addition amount is 0.5% of the total mass of the above-mentioned salt mud) and then transfer to a fluidized bed spray granulation dryer for dr...

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Abstract

The invention belongs to the technical field of environmental protection and solid waste resource utilization and particularly relates to a method for preparing a hydrochloric calcium magnesium snow melting agent from brine sludge produced with a lime flue gas method. Firstly, waste hydrochloric acid and the brine sludge produced with the lime flue gas method are subjected to a stirring reaction under the normal temperature, a reaction system is filtered, obtained filtrate is concentrated under reduced pressure, a corrosion inhibitor is added and mixed, the mixture is transferred to a fluidized bed spray granulation dryer for dry granulation, and the hydrochloric calcium magnesium snow melting agent is obtained. Cyclic utilization of brine sludge solid waste is realized, waste is turned into valuable, the production cost of the snow melting agent is substantially reduced, and micro ions have a remarkable synergic improvement function on snow and ice melting capability.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and solid waste resource utilization, and in particular relates to a method for preparing calcium magnesium hydrochloride deicing agent by using lime flue gas method salt mud. Background technique [0002] Snow in winter is the "big enemy" that hinders traffic. In the 1940s and 1950s, with the rapid development of transportation, deicing agents emerged as the times require. Deicing agents are mainly used in airports, highways, railways, and urban streets to remove snow or prevent freezing. [0003] Chloride salt deicing agents have been widely used in road deicing and deicing because of their good snow melting effect and low price. Until now, some countries still use chlorine salt as the main deicing agent, and our country is no exception. However, excessive use of chlorine salt deicing agents will lead to the death of a large number of roadside vegetation, corrosion and damage t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/73B01D53/50B01D53/80C09K3/18
CPCB01D53/502B01D53/73B01D53/80B01D2258/0283C09K3/18
Inventor 韩俊甜徐俊辉苏志俊冷翠婷崔耀星陈留平
Owner CHINASALT JINTAN
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