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Method for preparation of calcium magnesium hydrochloride snow-melting agent from two-alkali salt sludge

A technology of calcium magnesium hydrochloride and deicing agent, which is 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, and reduce disposal The effect of fees

Active Publication Date: 2017-02-15
CHINASALT JINTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical components involved in the salt sludge produced by the two-alkali 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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  • Method for preparation of calcium magnesium hydrochloride snow-melting agent from two-alkali salt sludge
  • Method for preparation of calcium magnesium hydrochloride snow-melting agent from two-alkali salt sludge
  • Method for preparation of calcium magnesium hydrochloride snow-melting agent from two-alkali salt sludge

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Effect test

Embodiment 1

[0021] The composition of the two-alkali salt mud used in the present embodiment is calculated as CaCO in parts by weight. 3 87.2 parts, NaCl1.2 parts, Mg(OH) 2 8.5 parts, CaSO 4 1.6 parts, Fe(OH) 3 0.5 part, Al(OH) 3 0.8 parts, SiO 2 0.2 parts,

[0022] (1) will contain 500g CaCO 3 The above-mentioned two-alkali salt mud is stirred and dispersed into a slurry in 500mL water at normal temperature (25°C), and then waste hydrochloric acid (HCl mass fraction is 29%, and the rest of the components do not participate in the reaction) is added dropwise to the slurry under stirring until No bubbles appear 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...

Embodiment 2

[0026] The composition of the two-alkali salt mud used in the present embodiment is calculated as CaCO in parts by weight. 3 87.2 parts, NaCl1.2 parts, Mg(OH) 2 8.5 parts, CaSO 4 1.6 parts, Fe(OH) 3 0.5 part, Al(OH) 3 0.8 parts, SiO 2 0.2 parts,

[0027] (1) will contain 500g CaCO 3 The above-mentioned two-alkali salt mud is stirred and dispersed into a slurry in 500 mL of water at room temperature (25° C.), and then in the slurry under stirring, waste hydrochloric acid (HCl mass fraction is 29%, and the rest of the components do not participate in the reaction) is added dropwise to the slurry until No bubbles appear 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) Combine the concentrate obtained in step (2) with the corrosion inhibitor (the corrosion inhibitor components are zinc dihydrogen phosphate and sodium lignosulfonate...

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Abstract

Belonging to the technical field of environmental protection and resource utilization of solid waste, the invention particularly relates to a method for preparation of a calcium magnesium hydrochloride snow-melting agent from two-alkali salt sludge. The method includes: firstly subjecting waste hydrochloric acid and two-alkali salt sludge to stirring reaction at room temperature, then filtering the reaction system, conducting pressure reduced concentration on the obtained filtrate, and adding a corrosion inhibitor and performing mixing, then transferring the mixture into a fluidized bed spray granulation drying machine to conduct drying granulation, thus obtaining the calcium magnesium hydrochloride snow-melting agent. The method provided by the invention realizes recycling of salt sludge solid waste, makes waste profitable, and greatly reduces the production cost of the snow-melting agent. Also, the existing trace ions play a significant synergistic role in enhancing the snow-melting and deicing ability.

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 two-alkali 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 to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/18
CPCC09K3/18
Inventor 苏志俊徐俊辉韩俊甜冷翠婷崔耀星陈留平
Owner CHINASALT JINTAN
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