WO2003042323A1

WO2003042323A1 - Snow-melting and antifreezing agent and a method for produce the agent

Info

Publication number: WO2003042323A1
Application number: PCT/CN2001/001627
Authority: WO
Inventors: Mingkui Han
Original assignee: Tianjinshi Changluprecisebioche Mistry Co., Ltd.
Priority date: 2001-11-13
Filing date: 2001-12-14
Publication date: 2003-05-22
Also published as: CN1347948A; CN1158375C

Abstract

This invention relates to a snow-melting and antifreezing agent composition and a method for produce the composition. This composition consists of NaC1, MgC12, 6H2O and CaC12, 6H2O. It characaterise that: It is shperoid, and the size of granular is 1-8mm. The method comprises: the desired amount of MgC12, 6H2O and CaC12, 6H2O are heated to melted liquid. Then the desired amount of NaC1 is added into the melts. Mixing these components to be an uniform slurry. Then it is pulverized in the tower pulverization device. The slurry drops from the top of the tower freely. After cool, it forms spherial granulars. After mesh screening, we obtained snow-melting and antifreezing agent, the size of granular is 1-8mm. Besides of excellent snow-melting, antifreezing, defrosting and dedusting performance, the product has the properties of unique shape, fluidity and uniformly blending. It is used as snow-melting, antifreezing, defrosting agent for all roads, e.g. garden, court, airport etc., used as dedusting agent for roads and used as antifreezing agent for cement road surface. The invention is more suitable for large scale machine operation.

Description

Snow melting antifreeze and manufacturing method thereof

The invention relates to a snow melting agent and a manufacturing method thereof, and in particular, to a snow melting antifreeze agent with a particle size of 1 to 8 mm and a manufacturing method thereof. The invention also relates to the application of the snow melting antifreeze in snow melting, antifreezing and dust removal. Background technique

Snowfall has a serious impact on people's production and life. Therefore, countries are paying more and more attention to snowmelt operations. The traditional main product of snowmelt is sodium chloride, but due to its environmental pollution and poor use in high and cold areas, the amount of use is gradually decreasing. At present, the blended salt magnesium and salt calcium snowmelting agents that are more commonly used in many countries, although they have fast-acting and long-lasting characteristics, have poor fluidity, slightly poor machine mixing uniformity, and contain a lot of sulfate ions. It also has corrosion on road shoulders and bridges, so this product is still not ideal.

In addition, the existing snow melting agents are all sheet-like in shape, and their shortcomings are poor fluidity, uneven spreading, and difficulty in penetrating into the snow completely, and the contact area with snow is small, resulting in long snow melting time. Therefore, the development of a snow melting agent with good fluidity, uniform spread and short snow melting time is an urgent problem to be solved at present. Content of the invention

The primary object of the present invention is to provide a snow melting antifreeze, which is a spherical particle with a particle size of 1 to 8. The snow melting antifreeze has completely overcome the defects of the traditional snow melting agent and provides a brand-new product. ;

Another object of the present invention is to provide a method for manufacturing snow melting antifreeze.

Another object of the present invention is to provide an application of the snow melting antifreeze in snow melting, antifreeze and dust removal;

The present invention relates to a snow melting antifreeze, which is composed of NaCl, MgCl ₂ · 6Η ₂ 0 and CaCl ₂ · 2H ₂ 0 The composition is characterized in that it is a spherical particle with a particle size of 1 to 8 mm.

The snow melting antifreeze according to the present invention may be a composite type, and its composition and weight ratio are:

NaCl 0-60

MgCl ₂ · 6H ₂ 0 0— 98 parts

CaCl ₂ · 2H ₂ 0 0— 98 parts

The condition is that the weight ratio of MgCl ₂ · 6H ₂ 0 and CaCl ₂ ■ 2H ₂ 0 cannot be zero at the same time.

Preferably, its composition and weight ratio are:

NaCl 30— 49 servings

MgCl ₂ · 6H ₂ 0 51— 70 parts

More preferably, its composition and weight ratio are:

NaCl 40— 49 servings

MgCl ₂ · 6H ₂ 0 51— 60 servings

In addition, the snow melting antifreeze according to the present invention can be made into a single magnesium type, that is, the weight ratio of NaCl and CaCl ₂ · 2H ₂ 0 is zero, and its composition is only MgCl _2. 6H ₂ 0.

The snow-melting antifreeze according to the present invention can also be made into a single calcium type, that is, the weight ratio of NaCl and MgCl ₂ · 6H ₂ 0 is zero, and its composition is only CaCl ₂ · 2H ₂ 0.

The invention also relates to a method for manufacturing the snow melting antifreeze, which method comprises the following steps:

(1) The required amount of MgCl ₂ ■ 6H ₂ 0 and / or CaCl ₂ · 2H ₂ 0 is heated and melted, and the heating and melting temperature is 120-190 ° C to make it a molten liquid;

(2) If necessary, add the required amount of sodium chloride to the melt to make it evenly mixed into a slurry, keeping the temperature at 116-13CTC;

(3) Using a tower granulation equipment, the slurry falls freely from the top of the tower and becomes spherical particles after cooling;

(4) Sieved, the finished product is a spherical snowmelt antifreeze with a particle size of 1-8mm. The granulation equipment used in the present invention is not too limited, as long as it is a tower granulation equipment, it can be used.

In the manufacture of a composite snowmelt antifreeze, the present invention uses high-quality magnesium chloride hexahydrate as a raw material, sends it into a melting tank by a bucket elevator, and heats it to 120-15 CTC to melt the magnesium chloride hexahydrate into a molten liquid. The pump is introduced into the mixing tank, and the sodium chloride is sent into the mixing tank with a bucket elevator, and the mixture is stirred in the mixing tank, so that magnesium chloride hexahydrate and sodium chloride are uniformly mixed to form a slurry in which both solid and liquid phases coexist. Finally, the slurry is driven to a granulating tower by a feed pump, and granulated using a rotary granulating head (for example, a general granulating head used for urea granulation). After cooling in the tower, spheroid particles coated with magnesium chloride are coated with sodium chloride as the nucleus. After screening, a qualified product—a composite snowmelt antifreeze (NaCl—MgCl ₂ composite snowmelt antifreeze) is obtained.

According to the method for manufacturing a snow melting antifreeze according to the present invention, the heating and melting temperature is 120-150 ° C.

In addition, the present invention also relates to the application of the snow-melting antifreeze in snow melting, anti-freezing and dust removal.

The application is to spray or throw the composite snow melting antifreeze directly on various roads, parks, courtyards or airport sites.

The manufacturing method of the invention is not harsh, the equipment is simple, raw materials are easily available, the cost is low, and continuous large-scale production can be achieved.

The invention can be directly sprayed or sprayed, and is mainly used for snow melting, antifreezing, and thawing in various roads, parks, courtyards, airports, and other places, as well as for road dust removal, soil stabilization, and cement road antifreeze.

Because the product of the present invention is spherical, the surface is smooth, and the fluidity is very good, which is very suitable for large-scale machine throwing. It is also very convenient to use in the home courtyard. Because the high-quality raw materials with very low sulfate ion are selected, the product of the invention has no adverse effects on road facilities and transportation equipment.

The product of the invention has stable use performance, has more uniform mixing, fast and durable snow melting and anti-freezing functions, and can be kept frozen for a long time. Its freezing point is below minus 37.3 ° C, which can ensure effective use in high and cold regions. Some samples have been tried in Japan with good results Is very popular among Japanese users.

The following snow melting test was performed using the composite snow melting antifreeze obtained in Example 1 below: Time: January 8, 2001-January 10, 2001

Location: No. 3 Henan Road, Tanggu District, Tianjin, Tianjin Changlu Fine Biochemical Co., Ltd. Highway

Implementation process:

Snowfall on the night of January 7th, at 7am on the morning of January 8th, the measured snow thickness was 6mm, the temperature—4.2 ° C, the road temperature—1.4 ° C. The courtyard road was 40 meters long and 8 meters wide divided into two areas, of which the length 20 meters wide and 8 meters are sprayed with the snow melting antifreeze of the present invention, the other half is not sprayed. The amount of spraying is based on the ratio of 50 grams of snow melting agent per square meter. The surface of the snow surface has been exposed. The unspreading part of the snow surface has not been melted. After 2.5 hours of spraying, all the snow has melted, the water has not frozen, and the part of the snow surface not sprayed with the anti-freezing agent has not yet melted. The hour temperature was-1.4 ° C. The highest temperature of the day reached 0.8 ° C. At 4:00 pm, observe the unspreading part of the snow slightly. On the 8th night, it snowed 2.3 again, and on the morning of the 9th, it was observed that there was no snow on the road where the snow-melting agent was removed, and the road was not frozen, and the antifreeze effect was obvious. A thin layer of ice has formed on the bottom of the pavement where no snowmelt antifreeze is sprayed. The snow is hard on the ice and the soft fresh snow on the upper layer. The highest temperature on the 9th is 1.2 ° C. The snow has been halved. On the 10th, the maximum temperature had reached 2.3 ° C and the snow melted at 3: 00 pm.

Through experiments, it is seen that under the same conditions, the road where the snow-melting agent is sprayed, the snow is melted in 2.5 hours, and the second largest drop is 2.3 mm of snow, which decreases with the fall, and the snow water is not frozen, and the snow-melting agent is not sprayed. It takes about three days to complete the road surface under the conditions of temperature rise. The product of the invention has good quick-acting properties, persistence, and obvious anti-freezing and snow-melting effects. Comparison of various snow melting effects

The above-mentioned spherical sodium-magnesium composite type, single magnesium type and single calcium type snow melting antifreeze agent are the products of the present invention, and others are traditional snow melting agents.

It can be known from the data in the table that the spraying time and snow melting time of the product of the present invention are significantly shorter than those of the conventional snow melting agent.

The three types of snow-melting antifreezes of the present invention are spheroids, and the biggest features are:

1. Strong fluidity, easy to spray by machine, uniform spraying, short spraying time, and traditionally easy to block the nozzle;

2. Spheroids are more likely to infiltrate into the snow when it is sprinkled on the snow. From the snow, the snow melting contact surface is large and the snow melts quickly, while the traditional ones do not easily penetrate the snow and some of them are exposed to the air, so the snow melts slowly.

The best way to implement the invention

Example 1:

With a bucket elevator, 5.1 tons of magnesium chloride hexahydrate was sent to a melting tank and heated to 145 ° C, and all the magnesium chloride hexahydrate was melted. Use the submerged pump to drive the obtained magnesium chloride hexahydrate molten liquid into the mixing tank, and use a bucket elevator to send 4.9 tons of sodium chloride (with a particle size of 4 or less) into the mixing tank, and start mixing for 0.5 hours to mix the slurry Hook. Keep the temperature at 120 ° C, use a feed pump to beat the slurry onto the granulating tower, use a rotary granulating head to spray liquid, and granulate as the material is fed. The droplets naturally fall on the top of the tower and are cooled into spherical particles. The scraper is sent to the screening machine outside the tower for screening. The qualified products of the spherical and sodium-magnesium composite snowmelting antifreeze with a particle size of 2-4mm are returned to the mixing tank for remelting and granulation.

Example 2

According to the method described in Example 1, the difference is that the raw materials used are magnesium chloride hexahydrate 6.0% and sodium chloride 4.0 tons to manufacture the sodium-magnesium composite snow-melting antifreeze.

Example 3

According to the method described in Example 1, the difference is that the raw materials used are magnesium chloride hexahydrate at 7.0 砘 and sodium chloride at 3.0 tons to manufacture the sodium-magnesium composite snowmelt antifreeze.

Example 4

Use a bucket elevator to send 10 tons of magnesium chloride hexahydrate into the melting tank and heat it to 145 ° C. All the magnesium chloride hexahydrate is melted. Then use a feed pump to hit the granulation tower. Use a rotary granulation head to spray the liquid. With the granulation, the droplets naturally fall on the top of the tower and are cooled into spherical particles. The scraper is sent to a sieving machine outside the tower for sieving to obtain a spherical, single-magnesium snowmelt antifreeze with a particle size of 2-4 mm. Non-conforming products are returned to the melting tank for remelting and granulation.

Example 5

According to the method described in Example 4, the difference is that the raw material used is 10 砘 calcium chloride dihydrate to produce a spherical, single-calcium snowmelt antifreeze with a particle size of 2-4. Industrial applicability

The snow-melting antifreeze according to the present invention is spherical, has a smooth surface, and has good fluidity, which is very suitable for large-scale machine throwing. The raw materials of the invention are of high quality and have no adverse effects on road facilities, transportation equipment and the like.

The conditions of the manufacturing method of the present invention are not harsh, the equipment is simple, raw materials are readily available, the cost is low, and continuous large-scale production can be achieved.

The anti-freezing agent for snow melting according to the present invention can be directly sprayed or sprayed, and is mainly used for snow melting, anti-freezing, dust removal and soil stabilization in various roads, parks, courtyards, airports, and the like.

Claims

Profit requirements

1-A snowmelt antifreeze consisting of NaCl, MgCl ₂ · 6H ₂ 0 and CaCl _2. 2H ₂ 0 '

It is characterized in that it is a spherical particle with a particle size of 1 to 8 mm.

2. The anti-freezing agent for snow melting according to the requirement 1

It is characterized by its composition and weight ratio:

NaCl 0—60 servings

MgCl _₂ - 6H ₂ 0 0-98 parts

CaCl ₂ · 2H ₂ 0 0—98 parts

The condition is that the weight ratio of MgCl ₂ · 6H ₂ 0 and CaCl ₂ · 2H ₂ 0 cannot be zero at the same time.

3. The anti-freezing agent for snow melting according to the requirement 2

It is characterized by its composition and weight ratio:

NaCl 30— 49 servings

MgCl ₂ · 6H ₂ 0 51— 70 parts

4. The anti-freezing agent for snow melting according to claim 3,

It is characterized by its composition and weight ratio:

NaCl 40— 49 servings

MgCl ₂ ■ 6H ₂ 0 51— 60 servings

5 · Snowmelting antifreeze according to the requirements of the branch 1,

It is characterized by its composition and weight ratio:

Both NaCl and CaCl ₂ · 2H ₂ 0 have a weight ratio of zero, and their composition is only MgCl ₂ · 6H ₂ 0.

6. The snowmelt antifreeze according to the requirements of claim 1,

It is characterized by its composition and weight ratio:

The weight ratios of NaCl and MgCl ₂ · 6H ₂ 0 are all zero, and their composition is only CaCl ₂ · 2H ₂ 0.

7. A method for manufacturing a snow melting antifreeze according to claim 1, the method comprising: Next steps:

(1) heating and melting the required amount of MgCl ₂ · 6H ₂ 0 and / or CaCl ₂ · 2H ₂ 0, and heating and melting at a temperature of 120-190 ° C to make it a molten liquid;

(2) If necessary, add the required amount of sodium chloride to the melt to make it evenly mixed into a slurry, keeping the temperature at 116-130 ° C;

(4) Sieved, the finished product is a spherical snowmelt antifreeze with a particle size of 1-8mm.

8. The method for manufacturing a snowmelt antifreeze according to claim 5, wherein the heating and melting temperature is 120-150 ° C.

9. An application of snow melting antifreeze according to claim 1 in snow melting.

10- The application according to claim 9, which is to spray or throw the snow-melting antifreeze directly on various roads, parks, courtyards or airport sites.

11. An application of snow melting antifreeze according to claim 1 in antifreeze.

12. The application according to claim 11, which is to spray or spray the snow melting antifreeze directly on various roads, parks, courtyards or airport sites.

13. —The application of snow melting antifreeze as described in 1 or 5 in dust removal.