JPS5899189A - Manufacture of limy fertilizer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention is a fertilizer or an industrial by-product containing calcareous matter.
The calcareous substances produced are treated with waste water condensation liquid, which is a secondary product of sugar beet sugar production.
affm* filtrata, hereinafter 0.8. The present invention relates to a method for producing a useful granular calcareous fertilizer by granulating F) as a granulating agent.

Conventional methods for granulating calcareous fertilizers include adding ligninsulfonic acids, which are by-products of the pulp industry, and granulating using a polymeric binder.
There is.

However, in the method of using ligninsulfonic acids as a granulating agent, the 8P method, which had not been adopted in the Bargou plant until now, tends to be abolished due to problems such as wastewater treatment.
Furthermore, as the use of lignin sulfonic acids is expanding, it has become extremely difficult to obtain inexpensive lignin/sulfonic acids.

In the method of using a polymer binder, the C of polyvinyl alcohol, carbo dtV methyl cellulose, etc. used as a polymer binder increases with the rise in oil prices, and it is necessary to obtain cheaper raw materials in the same way as above. Things are becoming extremely difficult.

In addition, a granulation method that does not use lignin/sulfo/acids or polymeric binders has been proposed, in which carbon dioxide gas is blown during drying to form a coating of Og (OH)* on the surface of each particle. (No. 4! Publication No. 47-130 JIJ), this method makes it difficult to achieve a low product cost because it is difficult to mass produce in a short time.

In addition, in order to increase the effectiveness of calcareous fertilizer, it is important that the particulate matter spread on the field quickly disintegrates, disperses, and mixes well with the soil. , which has the disadvantage of being difficult to disperse.

Furthermore, as a method to improve disintegration and dispersibility, it is known to arrange sodium salts such as sodium carbonate, sodium potassium carbonate, sodium sulfite, and sodium thiosulfate as granules, but these granulated fertilizers do not contain inorganic The disadvantage is that it consists only of ingredients and lacks organic matter that helps the growth of soil-destroying microorganisms.

On the other hand, o is discharged as a by-product from sugar beet factories.
S and y are attracting attention as substances that can supply effective organic matter to the soil, but if they are used as granules, the internal contents of the granular lime fertilizer O bagged product will be reduced during transportation, unloading, etc. The granular fertilizer turns into powder and cannot be sold commercially, and in order to eliminate this drawback, c, s, vopH*
3. A method of granulating calcareous fertilizer by adjusting it to a range of θ to 5.5 has been proposed.
In this method, C required a large amount of strong acids as a pH adjuster, and in addition, concentrated nitric acid was used in Kubachura, which caused foaming and heat generation, so the granulation process required about four hours and a lot of skill. Furthermore, in the case of granular fertilizers made with this as a granulating agent, when applied to the field, the particles disintegrate as they are dissolved by soil moisture - over a period of time, the particles disintegrate when they come in contact with moisture. However, there is a phenomenon in which parts of the ground surface that do not come into contact with moisture are extremely slow to disintegrate.

This invention takes into account the above circumstances, and can be granulated in a commercially available form S-, which absorbs the humidity in the fire after fertilization, rapidly disintegrates and disperses, and is an organic material that is effective for the growth of soil microorganisms. As a result of research aimed at finding a method for granulating calcareous fertilizers that are supplied with minerals and have a color on the market, the fertilizer acid i containing calcareous substances is converted into calcareous substances discharged as industrial by-products. ,
s, y.

After blending and granulating, pre-drying with a dryer, low f
The desired purpose was achieved by cooling and drying with li dehumidified air and then storing in a hermetically sealed manner.

Since the calcareous fertilizers and calcareous industrial by-products used in this invention are strongly alkaline, it is preferable that they are alkaline, such as carbonated lime, slaked lime, and lime nitrogen. Regarding the lime produced in sugar refinery and lime cake. , 8. F-untreated pellets cannot be granulated.

On the other hand, C used in this invention, 8. P is as shown in Table-1.

4- Add to some calcareous fertilizers or calcareous substances and granulate them. The granulation method is the same as the granulation process of general chemistry department, and for example, 0.8. F is added, mixed thoroughly using a kneader, and then granulated using a pulverizer and then a granulator.

After granulation, normal fertilizers have a flame temperature of, for example, 1,500°C.
, *fi@[aoo℃,)'>4-Y-rotation speed 15r,
After the granules were allowed to stay in the dryer frame for about 5 minutes, the temperature of the dried product from the dryer was set at 80 to 90°C, and the granules were shaped into single granules to obtain product C.

When 0,8,F is used as a granulating agent, it has extremely strong hygroscopicity, so it is pointless to obtain a sufficient product using the above method.

Therefore, in the present invention, the above granulated material is pre-dried in a dryer, then cooled and dried with low-temperature dehumidified air, and further sealed and stored.

The dryer used for pre-drying here has a length of 8 m (usually the length of a D dryer is 4.7111 mm).

7 v-5@WLl, 000°C (awI in normal dryer.

1.500℃), drum rotation speed 1gr, p1m (usually D
Drum rotation speed 15 degrees, p, ym>, m temperature 120 degrees Celsius (
The granulated material is retained in the drum dryer for 20 minutes (normal exhaust temperature is 300℃), and the residence time of the granules in the drum dryer is 20 minutes.
The process is continued until the moisture content reaches 21 degrees.

On the other hand, a sieve is installed directly below the outlet of the dryer, and the pre-dried material discharged from the dryer is passed through the sieve.
After sizing, the sized granules are immediately sent into a cooling dryer and cooled and dried with low-temperature dehumidified air. This cooling and drying air is, for example, air that has been cooled to an air temperature of 10°C or lower and passed through a dehumidifier.The cooling and drying air cools the granules in the process of passing through the cooling dryer. ,dry. In this drying process, the product temperature is below 10°C.
The dried product is immediately cooled and dried to a moisture content of O, S *. If you open it and fertilize it.

It absorbs moisture from the air on the soil surface and undergoes C disintegration, and is also incorporated into fertilizers as a granulating agent.

8. Because F and C exist in the soil, there is This provides organic matter that is effective for the growth of plants.

Hereinafter, the implementation sequence of this invention is shown.

Implementation 911 Calcium carbonate fertilizer based on official fertilizer standards (alkaline content 5
3%, 1.630 micron mesh sieve, 590
(passed through a 85-mesh sieve) is used as a raw material, and o,
After adding S and R (moisture 32%) in a weight ratio of 7-, the mixture was thoroughly mixed using a YH kneader, and then granulated using a granulator equipped with a crusher. The granulated material was fed into a dryer drum with a length of 8M1,7, a temperature of 1000°C, and a drum rotation speed of lOr, p, wh% and an exhaust temperature f of 120°C.
It was pre-dried for 20 minutes. The pre-dried product was dropped onto a sieve installed directly below the dryer drum discharge port, and was sized while passing through the sieve. The sized granules are immediately sent into a cooling drum dryer, and dehumidified dry air below the IOC is blown into the cooling drum dryer to convert the granules into products at 110°C and containing moisture. Cool and dry to about 540.51 and form a round shape. The obtained product was then packed in a bag and io-sealed. This was used as a prototype No. 1 and was subjected to a C physical property test.

Implementation 912 Calcium silicate powder (Official Fertilizer Standard 2.000 (for materials other than slag, passed through a 590 micron mesh sieve, 60% or more passed through a 590 micron mesh sieve)) was heated to 0°S, F. A granular calcium silicate fertilizer was produced by adding 6III, granulating it, pre-drying it, cooling it and packing it into one bag in the same manner as in the pH test.

This p product has a water content of 0.65%, fli fl
When the container was opened and fertilized at 54 Ky'd, it disintegrated and dispersed after a while. In addition, carunium silicate powder has carbonic power i
The particles of C powder are larger than those of 7um powder.

0,8. There is a tendency for less F to be used.

Practical row 3 Agricultural slaked lime powder is used as a raw material, and 0.8. F was added and C granulation was performed. In this case, since the slaked lime was a fine powder, it required a large amount of moisture and 0.8 F for granulation, and required 35% of the slaked lime powder. Below, implementation column 1
Preliminary drying, cooling drying, and bagging were performed in the same manner as above to obtain one granular slaked lime.

This granular slaked lime has a moisture content of 0.7% and a hardness of 2.01-
A product with higher hardness than the granular products of calcium carbonate and calcium chloride was obtained.

In addition, if you open this product 01 and apply fertilizer, it will remain for a while.
Completely collapsed and dispersed.

Comparison viI41 As in Example 1, calcium carbonate fertilizer based on the official fertilizer specifications (alkaline content 53%, passed through 1,63030 Miflon D sieve, seo i black/D sieve 85 or above) was used as raw material, and 0% .8. F (moisture 3z-) weight ratio 7- was added, and the mixture was thoroughly mixed using a kneader and then passed through a granulator to form granules.

Next, the above granules were fed into a dryer drum with a length of 47 m, a flame temperature of 1,500°C, an exhaust temperature of 300°C, a drum rotation speed Is r, p, and a dryer drum.
It dries in about 5 minutes, and the dry product from the dryer @
A dry product with a temperature of li 8G to 90°C was obtained.

The dried product was cooled with natural ventilation and sealed in a polyethylene bag (o, 1x11 layer) IC. This is the prototype Na2
It was subjected to physical property tests.

Comparative Example 2 Using the same calcium carbonate fertilizer as in Example 1 as a raw material, adding sodium ligninsulfonate in a weight ratio of γ, mixing, drying in the same equipment and conditions as in Comparative Example 1, and packing into one bag to obtain C. The obtained products were combined into prototypes 11 & L3 and subjected to physical property tests.

Comparison row 3 The same calcium carbonate fertilizer as in Example 1 was used as a raw material, and anhydrous sodium carbonate (weight specific gravity) was added as an aqueous solution.
Comparative 914 Fruit! /The same calcium carbonate fertilizer as in column IA is used as a raw material, and the pH is adjusted to 5.5 with nitric acid. Adjust to o and 90.

8. Add and mix r (moisture 32-) weight ratio xaSt.

The product obtained by adding insufficient water and granulating it, drying it in the same equipment and conditions as the comparative f4s, and packing it into bags was used as prototype-5 and subjected to physical property tests.

13- Physical Properties of Test Preliminary and Stored Products Granular calcareous fertilizer is used as an improver for aqueous soils, so it disintegrates quickly, disperses quickly, and has fast solubility. And for the prototypes-1--5 made in Comparison 1PIt~4, moisture and fl! Table 2 shows the physical properties of each prototype stored for 60 days (Grain & 3~
41): 10 grains for each test, 10 anti-aV average value for main test 94. ? ) was sealed in a 20-pack polyethylene bag and stored in a 7-tier warehouse for 60 days.The bag from the third tier in the center was removed from the 4Dv.

1 prototype each classified into particle size range 3~4111+Z)
Physical property test where 00 grains were subjected to physical property test! The hardness of the particles due to moisture absorption was tested for 100 particles determined by the preliminary test.

A constant temperature chamber was set at 20° C., and a dencator containing a saturated ammonium chloride (NH<cl) solution was inserted into the bottom of the chamber, and the chamber was sealed.

Dv! on a saturated solution coexisting with the same phase at a constant temperature. !
The humidity in the closed space remains constant. At this time, the temperature of the saturated ammonium chloride solution was 20°C, and the humidity in the desigador was 79.2.
94.

Each prototype was placed in this desiccator, and the hardness of the particles due to moisture absorption was investigated.

Each prototype was placed in a petri dish containing 10 grains, repeated 10 times, placed in a dencator, and v! After 24 hours, the hardness of each particle was measured by T-measurement. The results are shown in Table 3. Grain average value As is clear from these results, the prototype lI according to the implementation row 1
It is clear that &Ll has a lower hardness due to moisture absorption than the prototypes in Comparison Rows 2 to 4 and the prototypes in Examples 3 to b, and therefore has excellent disintegration and dispersibility after fertilization.

Physical property test 2 This test is 4, D, in which the disintegration rate and dispersion area in water were tested.

The disintegration rate was determined by filling a Petri dish with water to a water depth of 5 as D, dropping 10 samples into it, and sample C entering the water. 0
The time was measured.

The dispersion area is the area where the disintegrated particles become powder at the bottom of the petri dish.
The diffused area was measured using the projection method, and the test results for each of the 10 grains of XO rolled are shown in Table 4.

As is clear from the results shown in Table 4, disintegration rate in water and dispersion area, the prototype 1-1 obtained in Example 1 has excellent properties in both disintegration rate and dispersion area in water.

Physical property test 3 This test was conducted to determine whether the product would change to powder due to the impact that occurs during various operations such as transportation, unloading, etc. from the factory to the actual field application by the contractor. This is a durability test to determine whether the product is suitable for commercial sale.

In this test, samples were taken from the 9 zoh bags in preparation for the test and divided into 297 micrometers ayDm, and the smaller 4 samples were excluded. Next, weigh 3000 f of the granular 17- lime remaining on C- and put it in a polyethylene container.
Drop F from 1m onto a concrete dirt floor.

The contents were passed through a 297 micro 7 sieve again to obtain 1 piece of powder. The results are shown in Table-5.

Thorn-5 Durability Test: As is clear from the results of 297 i Cron ω Upper Granular Lime, calcareous fertilizer K O, 8, F was blended and granulated as in Comparative vP41, and this was dried by heat in the conventional manner. The round one lacked durability and could not be made into a commercial product (-2 prototype), but the product in the practical row L was ff
13. N&4. Like YO 6, it has sufficient durability and can be made into a commercially available product.

Summary 1/l - As is clear from the above physical property test and durability test results,
Calcareous fertilizer 0.8. Even when granulating with F,
Products manufactured using commonly used granulation methods, drying equipment, and drying conditions tend to disintegrate and have good dispersibility, but on the other hand,
, s, yp Due to strong hygroscopicity "f), it has already absorbed moisture during the manufacturing process and is stale, so the product hardness is small.
In addition, the durability is extremely poor and it is not commercially available.On the other hand, in the invention, the granules are pre-dried for a sufficient period of time, and after death, the granules are cooled, dehumidified, and dried using dry air. Since the product is cooled and dried and then stored in a sealed container, the product is durable, does not turn into powder during handling such as transportation, and has sufficient marketability.

Products manufactured according to the present invention are also listed in comparison column 2.3.
Compared to the 11 products manufactured in No. 4, the particle hardness, softening and disintegration due to moisture absorption, and dispersibility are extremely low, making it excellent as a granular fertilizer.

Claims (3)

[Claims] (1) Fertilizers containing calcareous substances or industrial by-products
This is a calcareous fertilizer characterized by distributing ST7EN wastewater concentrate to the limestone-containing material produced by ip, granulating it, pre-drying it with a dryer, cooling and drying it with low-temperature dehumidified air, and then storing it in a hermetically sealed manner. Manufacturing method. (2) Dry product temperature [SO ~ 40℃, moisture content 2-
The manufacturing method according to claim 1, which comprises pre-drying to a certain extent. (3) Product temperature below 10°C, moisture content 0jII1
1! Manufacture according to claim 1, wherein the product is cooled and dried to a temperature of