LIMEan essential material

Kotegawa Sangyo Co.,Ltd.

January 2022

Contributing to the Future ofPeople and Nature.
Kotegawa Sangyo is located in Tsukumi city,Oita Pref.,where blessed with
one of the largest limestone mine in Japan.
With it’s high quality limestone, we have been providing lime-based various
products and solutions to wide range of industries for over 126 years.
Based on the long-standing experience and technology focused on calcium,
we further accelerate research and development activities for new fieldand create higher value-added products.
Keep on defining the needs of customers and society and contributing tothe future of people and nature. That’s our mission.

Index
Process & Products

P.2

Lime for Environment

P.5

Lime for Daily Life

P.3

Research and Development / Quality Control

P.6

Lime for Project

P.4

Corporate Plofile

P.7
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Process and Products

Quarrying & Crushing

Products

Used foraggregates, asphalt filler
neutralization of acidic soil

Limestone quarried out from the mine is crushed in stages
and sorted into different sizes by screening.
Some fractions are ground more finely and provided asindustrial-grade products in powder form.

BurningThe crushed limestone (CaCO3) is burnt in a vertical furnace
at high temperature more than 900℃, and it breaks down
into calcium oxide (CaO), i.e. quicklime, by giving off
carbon dioxide (CO2). *Carbon dioxide is captured and effectively reused.

Hydrating
By adding water, the calcium oxide reacts with moistureand generates heat. The calcium oxide is transformed tocalcium hydroxide (Ca(OH)2), i.e. hydrated lime, in theprocess. The end product is strongly alkaline.

Value Adding

supplying nutrition for plants
animal feed additives
LimestoneLimestone Powder

Products *providing wide range of sizes

flue-gas desulfurizationand more

Used forpulp and paper manufacturing
improving soil stability
impurity removal for steelmaking
moisture absorbing desiccant

Quicklime（Granular form）

Products *providing wide range of sizes

and more in chemical industry fields

Used forflue-gas desulfurizationwater treatment
soil improvement for agriculturesugar refining process

Hydrated lime

（Granular form）

quarantine and disinfection

and more

Product
MONO - CARBONATE< SYNTHETIC HEXAGONAL PLATE-FORM WHITE PIGMENT >Hydrated lime reacts with carbon dioxide to convert it backto limestone (CaCO3) which is known as Pricipitated
Calcium Carbonate (PCC). Chemically controlling theparticle of PCC is the key to create high-value product.

MONO-CARBONATE was created as a pigment forcoated paper. The feature, offering higher glossiness
and whiteness than that’s of kaoline (clay)(the most major pigment), is derived from thecarefully-designed particle shape controlling
processes.

SEM photography(particle size: aprx. 0.9μm)

Most suitable forgravure printing2

TECHNOLOGY
pursuing quality and efficiency

LIME for Daily Life
Quicklime Production Process

From steel frame for building to organic vegetables,
lime is required in the production process of broad
range of industries as an essential material.
Lime enriches our daily life behind the scenes.

at the scenes

A moment in a café, for instance, many things are produced using lime-based products.

Farm Products

Sugar（Maertz® style shaft kiln）

Limestone (CaCO3)

Fuel
Preheatingzone

Heat storage shaft

Iron & SteelBURNING SYSTEM

Heating shaft

Pulp & Paper

Limestone(CaCO3) isheated in a Maertz®
style shaft kiln (furnace)at over 900℃ to convert
into calcium dioxide(CaO), i.e quicklime,and
the furnace is consists of
two shafts.
While burning anddecarboxylation oflimestone is processed in
the shaft, the other shaft
is preheated byreutilizing the exhausted
heat gas. The processes
are switched at every
constant time, and thus
each shaft alternately
repeats “heating” and“preheating” process toenable efficient
quicklime production.

Heatingzone

Coolingzone

Combustion air
Exhaust heat gas
Cooling air

Quicklime (CaO)

Shift to Digital Basis
Quicklime is used in the processof caustic soda recovery to assist
the chemical circulation of pulp
manufacturing. Also, it increases
strength and whiteness of paper
as a filler material.

Limestone is utilized to convert ironore into pig iron in blast furnaces.
Quicklime plays a role in removing
impurities (silica,sulfur,phosphorus)
from pig iron in basic furnaces
and electric arc furnaces.

In the agricultural sector, lime is
widely diffused to supply farm
products with mineral which isessential nutrients to grow well.
In addition, lime is very effective
for neutralizing the acidic soil.

In sugar production process, limeis used to absorb impurities.
Hydrated lime is added to liquidsugar and reacts with CO2 to form
calcium carbonate. It causes theprecipitation of undesired colloids.

We vigorously push forward thedigitalization of whole production
process by introducing IoT and AI
technology for managing the quality
and productivity more exactry.

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IMPROVEMENT
ensuring stability and durability

LIME for Development

Reaction Mechanism

As an application for soil improvement providing
stability and workability, lime is used at various
construction sites of social infrastructure whichmakes our life and business more convenient.

Lime-based soil stabilizing material contributes to the safety and efficiency of development projects.

Sediment accumulated on the sea floor
is dredged up regularly in order to avoid
running aground. The dredged soil, highmoisture content and soft, is solidified bymixing with lime-based soil stabilizing
material and is utilized as landfill soil invarious situations including pier construction and industrial site development.

MoistureCaO(add Quicklime)

H2 O

H2 O

Ca(OH)2H2 O

H2 O
Promote evaporation

Ca2+Ca2+2Ca(OH)2

Ca2+ Ca2+Ca2+
OHOHCa2+
Ca2+ Ca2+
OH-Coagulation

Carbonation

When a large structure is constructed,
such as shopping mall and office building,the ground must be assured of sufficientdurability to bear the enormous weight.
Lime-based product is widely recognized
as an application of foundation groundimprovement. For use in city-area, nonscatterng type is also provided.

Harbor

Pozzolan

The properties of ground where
highway is constructed on vary widely.
At the area of soft soil, lime-based
product is used as an application ofimprovement to transform into stableground that avoids the risk of roaddeformation caused by the load due tocar traffic and road structure.

BuildingCaO
SoilParticle

OH-Ion Exchange

Highway1
Hydration & Water Absorption

at the scenes

Adding quicklime to soft andhigh-moisture soil causes
hydration reaction, and it
induces dehydration andevaporation due to heating.
Furthermore, because ofhydration, the volume of soil
is expanded. These bring theimprovements of soil stability
and workability.
Then, due to ion-exchange
reactions, the particles of soil
are electrically coagulated,
and the plasticity of cohesive
soil is weakened as a result.
Soil particles react with lime
further to generate andharden the mineral crystals
that provide enough stability
and durability to soil.
The effect of soil stabilizing bylime lasts for a long term.

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CaCO3
Dissolve thesurface ofSoil Particle(Alkalize)

Stbilizing
gradually
Accelerate hardening by reactant(Long-term stability)

Products for Soil I mprovement
Soil Type
Product Name
Earthlime Q
GeneralSoft/Unique
Earthlime B-G
RegularOrganic
Earthlime B-K
Earthlime H
Gravel/Sand
Super Earthlime Q
GeneralNonSoft/Unique
Scattering Super Earthlime BOrganic
Super Earthlime B-K
Series4TRUST
engaging in safe & stable production

LIME for Environment

Quarrying Operations

As a safe and versatile alkaline resource, hydrated
lime is an essential material for environmental
protection measures. In addition, hydrated lime isused for quarantine to suppress the infections.

We have been undertaking
the operation of limestone
quarrying from TAIHEIYOCEMENT CORPORATION,
a major cement company
in the world, and thequantity we quarry out isabout 4million tons a year.

at the scenes

Lime, the blessing of nature, is utilized for many appoaches to keep the earth clean.

Water Treatment

Plant & Factory

Greening

also for Quarantine

Based on safety-firstpolicy, we are engaging
in the stable production
with the combination ofhigh-performance heavymachineries andIoT technology.

Tsukumi Mining Area
In the water supply process, hydrated lime mainly plays a role of
pH adjuster. For the treatment ofsewage, as a flocculant, it assists
coagulation, pricipitation anddehydration of sludge.

At refuse disposal plant, hydrated
lime is blown into the flue of incinerator to absorb the hazardous
substances such as sulfur dioxideand hydrogen chloride containedin the emissions.

Greening is one of the major
approaches as a global warming
countermeasure. But most plants
can not grow on strongly acidicsoils. Lime is a popular solution toneutralize the acidic soil.

Domestic animal infectious
diseases such as bird flu andfoot-and-mouth disease havea serious impact on animalfarmers. Hydrated lime is
widely used for disinfection
thanks to strongly alkaline.

As one of the leading limestone
production areas in Japan, the total
output reaches approximately 25million
tons a year. The reserves are estimatedover 4 billion tons.

5Research& Development“Exploring the future with calcium technology”
Is the core idea of our company. Based on the longstanding experience and technology focused on
calcium, we positively undertake research anddevelopment activities of high value-added materials.
By developing better products for existing markets,and creating new functional materials for new markets,
we provide solutions to meet customer demands andsocial issues with calcium-based material.

Development FlowSocial / Customer Needs
IMPROVED PRODUCT（High Functionality）（Cost Reduction）Calcium-based Material

Value-Added ProductResearch & Development

FUNCTIONAL SYNTHETICCALCIUM CARBONATENEW PRODUCT（New Market）（New Application）

Ever since its establishment, we, as a manufacturer
of JIS (Japanese industrial Standards) accredited
products, have been working on thorough quality
control to provide a stable supply of high quality
and been proactive in introducing various
advanced analyzing instruments.
Also, we have achieved ISO 9001 certification toaddress the continual improvement for offering asatisfactory quality to our customers byconstructing and operating the whole businessprocess from manufacture to sale.

Fluorescent X-ray
Analyzer
Analyzing the property
and quantity of multiple
constituent elements,
such as silica andmagnesium which
influences the quality ofproduct, in a short time
without demolition ofsample.

Carbon / Sulfur
Analyzer

Quality Control

ISO 9 0 01 Ce r tif ie dContent percentage ofcarbon dioxide and sulfur
in product is directly linked
to the quality. The analyzer
measures the wide rangeof concentration ofcarbon and sulfur in solid.
6Corporate Profile

Outline （As of January 31, 2022）

Scope of Business

Production Capacities （per month）

Company Name

1. Manufacture and sale of lime-based products.

Quarrying

500,000 t

2. Research and development ofQuicklime

13,500 t

Hydrated Lime

8,000 tLimestone

3,000 tPresident and CEO
Established
Capital

Kotegawa Sangyo Co.,Ltd.
Yasumasa Kotegawa
March 1895
¥79,500,000

Head Office

1-4 Gonomotomachi, Tsukumishi,
Oita 879-2471, Japan

Employees

130

Affiriated Companies

10

functional synthetic calcium carbonate.
3. Quarrying of limestone

www.k-lime.co.jp

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