CN103342988A - Environment-friendly snow melting agent and preparation method thereof - Google Patents

Abstract

The invention relates to an environment-friendly deicing agent and a preparation method thereof, belonging to the field of deicing agents. The environmentally-friendly deicing agent uses acetate and less corrosive chloride salts as main raw materials, and mainly includes methyl acetate, magnesium acetate and calcium acetate , prepared by adding a certain proportion of calcium chloride and magnesium chloride and a small amount of corrosion inhibitor. It effectively improves the common problem of high corrosion of common inorganic deicing agents, reduces the cost, and is suitable for popularization and application.

Description

A kind of environment-friendly deicing agent and preparation method thereof

technical field

The present invention relates to an environment-friendly deicing agent and its preparation method, in particular to the formulation and preparation process of the environment-friendly deicing agent.

Background technique

Ice and snow in winter have always brought serious hidden dangers to traffic safety, and traffic accidents caused by ice and snow roads have caused huge economic losses and casualties. At present, snow removal methods are mainly divided into mechanical snow removal and chemical snow removal. Among them, mechanical snow removal is flexible, fast, and has a wide range of applications, but there are deficiencies such as poor removal rate and easy damage to the road surface; the snow removal method of chemical deicing agent can make up for the shortage of mechanical snow removal, and is an effective means of melting snow and ice. Its use is irreplaceable. The type and application amount of deicing agent are generally determined comprehensively according to the climate characteristics and snowfall in different regions. Currently, deicing agents include chlorine salts and non-chlorinated salts. Chlorinated deicing agents are inorganic deicing agents, which cause damage to asphalt and cement concrete pavement, bridges, soil, roadside trees, greening and natural environment to a certain extent. It has a serious impact on the water quality of farmland irrigation water and municipal infrastructure, and this impact is increasingly valued by the society. Non-chlorine salt deicing agents include organic deicing agents such as acetate and urea. The main characteristics of this type of deicing agents are that they are expensive, rely on natural factors such as temperature and sunlight for snow melting, and have a long reaction time for snow melting. At present, the environmentally friendly deicing agents recognized internationally are limited to acetate products, which have fewer types of raw materials, simple production technology, and environmental protection characteristics that are in line with my country's economic development policies. However, due to cost and other economic factors, some developed countries It can only be applied in small amounts. my country is a developing country, and it is even less likely that non-chlorine salt deicing agents will be used in large quantities in the short term. However, environmental protection has been paid more and more attention, especially high-grade highways, large bridge decks, especially steel bridge decks, etc. need more environmentally friendly snow-melting agents.

Contents of the invention

Purpose of the invention:

In order to solve the above problems, the present invention proposes an environment-friendly deicing agent and its preparation method, which effectively improves the common problem of high corrosion of common inorganic deicing agents and reduces the cost of CMA organic deicing agents in the world.

Technical solutions:

The present invention is achieved through the following technical solutions:

An environment-friendly deicing agent, characterized in that it is prepared by weight from the following raw materials: 30-35% calcium magnesium acetate, 15-18% potassium acetate, 15-20% calcium chloride, and 20-25% magnesium chloride , calcium oxide 5-8%, corrosion inhibitor 2.5-3.5%.

The corrosion inhibitor components are as follows by weight: 50% sodium hexametaphosphate, 25% sodium silicate, 10% zinc dihydrogen phosphate, 10% thiourea and 5% urea.

A method for preparing the above-mentioned environment-friendly deicing agent, characterized in that: the steps are as follows:

(1) Take each raw material according to the above ratio, grind it into powder with a ball mill;

(2) Mix calcium magnesium acetate, potassium acetate, calcium chloride, magnesium chloride, and calcium oxide powder and then fully stir;

(3) After adding 2.5-3.5% of the slow-release agent, it is fully fused, and the evenly stirred mixture is sent to the sprayer of the prilling tower, cooled to room temperature 20°C under normal pressure, solidified into a granular compound, and passed through the tower The bottom scraper is sent to the storage and packaging workshop with the conveyor belt, and packaged into finished products.

Advantages and effects:

Compared with sodium chloride, this environment-friendly snow-melting agent of the present invention has better water solubility, and the ice eutectic point is lower, and it is biodegradable and has strong snow-melting ability, which can loosen accumulated snow and make it easier to shovel. The impact on plants along the road, soil and water pollution, metal corrosion, and chemical toxicity are very low, which meets the national environmental protection standards.

The present invention does not need additional scarce materials in the use of raw materials, and all the main materials are composed of common salts, which reduces the production cost and simplifies the production process.

The snow-melting agent produced according to the formula and production process of the present invention has good snow-melting and ice-melting performance, low freezing point, low corrosion to metal and concrete of municipal infrastructure, extremely low damage to farmland and green vegetation, and simple production process Advantages, suitable for industrial production.

Description of drawings:

Fig. 1 is process flow chart of the present invention.

Detailed ways:

The present invention is further described below in conjunction with accompanying drawing:

The working principle of the present invention is as follows:

The principle of deicing agent is mainly to use the substances that melt snow to reduce the freezing temperature of water, melt new snow during snowfall, and prevent snow from freezing. Since the deicing agent has a low freezing point, it can be directly sprinkled on the ice and snow on the road surface, and the frozen ice and snow can be thawed into water. Compared with sodium chloride, this environmentally friendly snow-melting agent has better water solubility, lower ice eutectic point, biodegradability and strong snow-melting ability, which can loosen snow and make it easier to eradicate, and it is also beneficial to plants along the road. The impact of pollution, soil and water pollution, metal corrosion, chemical toxicity, etc. are very low, in line with national environmental protection standards.

The product does not require additional scarce materials in the use of raw materials, and all the main ingredients are composed of common salts, which not only reduces the production cost, but also simplifies the production process.

The environmentally friendly deicing agent uses acetate and less corrosive chloride salts as the main raw materials, mainly including methyl acetate, magnesium acetate and calcium acetate, mixed with a certain proportion of calcium chloride and magnesium chloride and a small amount of corrosion inhibitor. During production, all kinds of raw materials are fully crushed to form powder, fully mixed according to the proportion, and then processed into granules or flakes through granulation process.

The snow-melting agent produced according to the formula and production process of the present invention has good snow-melting and ice-melting performance, low freezing point, low corrosion to metal and concrete of municipal infrastructure, extremely low damage to farmland and green vegetation, and simple production process Advantages, suitable for industrial production.

1. Main raw materials and quality requirements

Calcium magnesium acetate: a mixture of calcium acetate and magnesium acetate, the molecular formula is Calcium Magnesium Acetate, CMA);

Potassium acetate: It is colorless crystal or white crystalline powder with molecular formula CH ₄ ON ₂ . Odorless, salty and cool taste; slightly hygroscopic, easily soluble in water.

Calcium chloride: white powder, granular, flake, block, chemical formula is CaCl ₂ , density 2.15g/cm ₃ , melting point 782°C, boiling point 1600°C. The dissolution of calcium chloride in water can form hydrates containing 1, 2, 4, and 6 crystal waters, CaCl ₂ ·H ₂ O, CaCl ₂ ·2H ₂ O, CaCl ₂ ·4H ₂ O, CaCl ₂ ·6H ₂ O.

Magnesium chloride: It is a mixture of MgCl ₂ ·6H ₂ O and MgCl ₂ ·4H ₂ O, and the crystal magnesium chloride is mainly MgCl ₂ ·6H ₂ O. The products are block, flake, granular and powder, containing about 45~50% MgCl ₂ .

Corrosion inhibitor: The main components of the corrosion inhibitor include sodium hexametaphosphate, sodium silicate, zinc dihydrogen phosphate, and urea.

Sodium hexametaphosphate, molecular formula: (NaPO ₃ ) ₆ . It is neutralized by soda ash or caustic soda solution and phosphoric acid, and then heated to 250°C to generate sodium metaphosphate, then heated to 620°C to melt and polymerize the crystal, and it is produced by quenching and tableting (granulation).

Sodium silicate, molecular formula: Na ₂ SiO ₃ ·9H ₂ O. Production is divided into two production methods: dry method and wet method. Dry method is to mix quartz sand and soda ash in a certain proportion and heat them to about 1400°C in a reverberatory furnace to form molten sodium silicate; wet method uses quartzite Powder and caustic soda are used as raw materials, react in a high-pressure steamer under 0.6-1.0Mpa steam, and directly generate liquid sodium silicate (and liquid water glass).

Zinc dihydrogen phosphate: Molecular formula: Zn(H ₂ PO ₄ )2·2H ₂ O. Preparation method: Phosphoric acid and zinc oxide are reacted at 100-120 ° C, concentrated, cooled and crystallized, and obtained by solid-liquid separation.

Urea: The molecular formula is CO(NH ₂ ) ₂ , the main synthesis reaction equation is 2NH ₃ (liquid)+CO ₂ (gas)=NH ₄ COONH ₂ (liquid), NH ₄ COONH ₂ =CO(NH ₂ ) ₂ (liquid) +H ₂ O .

2. Synthetic Formula for Snow Melting Agent

See Table 1 for the main ingredients and proportions of the deicing agent, and Table 2 for the chemical composition and ratio of each component of the corrosion inhibitor.

Table 1 Main chemical composition and the proportion of each component 

chemical composition CMA CH ₄ ON ₂ MgCl _{2 CaCl2} CaO corrosion inhibitor Proportion% 30-35% 15-18% 15-20% 20-25% 5-8% 2.5-3.5%

Table 2 Chemical composition and proportion of corrosion inhibitors

chemical composition Hexametaphosphate Sodium silicate Zinc Dihydrogen Phosphate Thiourea urea Proportion% 50% 25% 10% 10% 5%

The proportion of corrosion inhibitor in the deicing agent is only 2.5-3.5%, but it plays a very important role in delaying corrosion on the steel bridge deck. The principle of its corrosion inhibition is that the corrosion inhibitor can chemically react with metal ions to form a protective, insoluble compound oxide film layer on the metal surface, which mechanically separates the metal from the medium, prevents the corrosion process, and acts as a corrosion inhibitor. effect.

3. Preparation process

The preparation process is the key to ensure the product quality. The general process of the production of this environment-friendly deicing agent is shown in Figure 1. Grind various ingredients into powders and mix thoroughly, add corrosion inhibitors and mix well, then pump them to the sprayer of the prilling tower after cooling, solidify into granular composites, and pass through the scraper at the bottom of the tower Send to the storage and packaging workshop with the transport belt.

The technical performance of deicing agent should meet the requirements in Table 3.

Table 3 Performance requirements of deicing agent

Table 4 The performance of environment-friendly deicing agent of the present invention and the contrast of industrial salt

Below in conjunction with specific embodiment, the present invention is further described:

The environment-friendly deicing agent of the present invention uses acetate and less corrosive chloride salts as main raw materials, mainly includes methyl acetate, magnesium acetate and calcium acetate, and is mixed with a certain proportion of calcium chloride, magnesium chloride and a small amount of buffering agent. etchant.

The environment-friendly deicing agent of the present invention is prepared by weight from the following raw materials: calcium magnesium acetate 30-35%, potassium acetate 15-18%, calcium chloride 15-20%, magnesium chloride 20-25%, Calcium oxide 5-8%, corrosion inhibitor 2.5-3.5%.

The corrosion inhibitor components are as follows by weight: 50% sodium hexametaphosphate, 25% sodium silicate, 10% zinc dihydrogen phosphate, 10% thiourea and 5% urea.

A method for preparing the above-mentioned environment-friendly deicing agent, characterized in that: the steps are as follows:

(1) Take each raw material according to the above ratio, grind it into powder with a ball mill;

(2) Mix calcium magnesium acetate, potassium acetate, calcium chloride, magnesium chloride, and calcium oxide powder and then fully stir;

(3) After adding 2.5-3.5% of the slow-release agent, it is fully fused, and the evenly stirred mixture is sent to the sprayer of the prilling tower, cooled to room temperature 20°C under normal pressure, solidified into a granular compound, and passed through the tower The bottom scraper is sent to the storage and packaging workshop with the conveyor belt, and packaged into finished products.

Example 1

An environment-friendly deicing agent prepared by weight from the following raw materials: 30% calcium magnesium acetate, 15% potassium acetate, 20% calcium chloride, 25% magnesium chloride, 6.5% calcium oxide, and 3.5% corrosion inhibitor.

The corrosion inhibitor components are as follows by weight: 50% sodium hexametaphosphate, 25% sodium silicate, 10% zinc dihydrogen phosphate, 10% thiourea and 5% urea.

The preparation method of above-mentioned environment-friendly type deicing agent, the steps are as follows:

(1) Take the raw materials according to the above ratio, 30% calcium magnesium acetate, 15% potassium acetate, 20% calcium chloride, 25% magnesium chloride, 6.5% calcium oxide, 3.5% corrosion inhibitor, and grind them into powder with a ball mill ;

(2) Mix calcium magnesium acetate, potassium acetate, calcium chloride, magnesium chloride, and calcium oxide powder and then fully stir;

(3) After adding 3.5% slow-release agent, it is fully fused, and the evenly stirred mixture is sent to the sprayer of the prilling tower, cooled to room temperature 20°C under normal pressure, solidified into a granular composition, and scraped through the bottom of the tower The feeder is sent to the storage and packaging workshop with the conveyor belt, and packaged into finished products.

Example 2

An environment-friendly deicing agent prepared by weight from the following raw materials: 35% calcium magnesium acetate, 15% potassium acetate, 20% calcium chloride, 20% magnesium chloride, 7.5% calcium oxide, and 2.5% corrosion inhibitor.

The corrosion inhibitor components are as follows by weight: 50% sodium hexametaphosphate, 25% sodium silicate, 10% zinc dihydrogen phosphate, 10% thiourea and 5% urea.

The preparation method of above-mentioned environment-friendly type deicing agent, the steps are as follows:

(1) Take the raw materials according to the above ratio, 35% of calcium magnesium acetate, 15% of potassium acetate, 20% of calcium chloride, 20% of magnesium chloride, 7.5% of calcium oxide, 2.5% of corrosion inhibitor, and grind them into powder with a ball mill ;

(2) Mix calcium magnesium acetate, potassium acetate, calcium chloride, magnesium chloride, and calcium oxide powder and then fully stir;

(3) After adding 2.5% slow-release agent, it is fully fused, and the evenly stirred mixture is transported to the sprayer of the granulation tower, cooled to room temperature 20°C under normal pressure, solidified into a granular composition, and scraped through the bottom of the tower The feeder is sent to the storage and packaging workshop with the conveyor belt, and packaged into finished products.

Example 3

An environment-friendly deicing agent prepared by weight from the following raw materials: 32% calcium magnesium acetate, 18% potassium acetate, 15% calcium chloride, 24% magnesium chloride, 8% calcium oxide and 3% corrosion inhibitor.

The corrosion inhibitor components are as follows by weight: 50% sodium hexametaphosphate, 25% sodium silicate, 10% zinc dihydrogen phosphate, 10% thiourea and 5% urea.

The preparation method of above-mentioned environment-friendly type deicing agent, the steps are as follows:

(1) Take the raw materials according to the above proportions, 32% of calcium magnesium acetate, 18% of potassium acetate, 15% of calcium chloride, 24% of magnesium chloride, 8% of calcium oxide, 3% of corrosion inhibitor, and grind them into powder with a ball mill ;

(2) Mix calcium magnesium acetate, potassium acetate, calcium chloride, magnesium chloride, and calcium oxide powder and then fully stir;

(3) After adding 3% slow-release agent, it is fully fused, and the evenly stirred mixture is sent to the sprayer of the granulation tower, cooled to room temperature 20°C under normal pressure, solidified into a granular composition, and scraped through the bottom of the tower. The feeder is sent to the storage and packaging workshop with the conveyor belt, and packaged into finished products.

Example 4

An environment-friendly deicing agent prepared by weight from the following raw materials: 35% calcium magnesium acetate, 17% potassium acetate, 18% calcium chloride, 22% magnesium chloride, 5% calcium oxide and 3% corrosion inhibitor.

The corrosion inhibitor components are as follows by weight: 50% sodium hexametaphosphate, 25% sodium silicate, 10% zinc dihydrogen phosphate, 10% thiourea and 5% urea.

The preparation method of above-mentioned environment-friendly type deicing agent, the steps are as follows:

(1) Take the raw materials according to the above ratio, 35% of calcium magnesium acetate, 17% of potassium acetate, 18% of calcium chloride, 22% of magnesium chloride, 5% of calcium oxide, 3% of corrosion inhibitor, and grind them into powder with a ball mill ;

(2) Mix calcium magnesium acetate, potassium acetate, calcium chloride, magnesium chloride, and calcium oxide powder and then fully stir;

(3) After adding 3% slow-release agent, it is fully fused, and the evenly stirred mixture is sent to the sprayer of the granulation tower, cooled to room temperature 20°C under normal pressure, solidified into a granular composition, and scraped through the bottom of the tower. The feeder is sent to the storage and packaging workshop with the conveyor belt, and packaged into finished products.

in conclusion:

The deicing agent described in the present invention can be used on steel bridge decks and places with extremely high corrosion requirements, and has the advantages of high snow-melting and ice-melting efficiency, low ice eutectic point, low corrosivity, and biodegradability, and is effective on bridge decks, soil, roads, etc. The side trees, greening and natural environment are basically pollution-free, and have low impact on the water quality of farmland irrigation water. At the same time, the production process is simple, and it is convenient for large-scale production, storage and spreading, and its durability is greatly improved when it is used on steel bridge decks.

The invention improves the common problem of high corrosiveness of common inorganic deicing agents, reduces the cost of CMA organic deicing agents in the world, and has broad application prospects.

Claims (3)

1. An environment-friendly deicing agent, characterized in that: it is prepared by weight from the following raw materials: calcium magnesium acetate 30-35%, potassium acetate 15-18%, calcium chloride 15-20%, magnesium chloride 20- 25%, calcium oxide 5-8%, corrosion inhibitor 2.5-3.5%. 2. The environment-friendly deicing agent according to claim 1, characterized in that: the corrosion inhibitor components are as follows by weight: sodium hexametaphosphate 50%, sodium silicate 25%, zinc dihydrogen phosphate 10%, Thiourea 10% and Urea 5%. 3. A preparation method of environment-friendly deicing agent as claimed in claim 1, characterized in that: the steps are as follows: (1) Take each raw material according to the above ratio, grind it into powder with a ball mill; (2) Mix calcium magnesium acetate, potassium acetate, calcium chloride, magnesium chloride, and calcium oxide powder and then fully stir; (3) After adding 2.5-3.5% of the slow-release agent, it is fully fused, and the evenly stirred mixture is sent to the sprayer of the prilling tower, cooled to room temperature 20°C under normal pressure, solidified into a granular compound, and passed through the tower The bottom scraper is sent to the storage and packaging workshop with the conveyor belt, and packaged into finished products.

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