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The Development Prospect of Limestone Industry2023-08-25 17:28:39

Limestone, being a valuable mineral resource, not only possesses abundant reserves and wide distribution but also plays a pivotal role in various industries. With its extensive historical usage as a significant building material, limestone continues to be extensively utilized in modern industrial processes. In the construction industry, limestone serves as the primary raw material for cement manufacturing. Its unique chemical composition enables it to react with water and form a solid matrix that binds aggregates together, creating durable and robust concrete structures. Additionally, limestone is used in lime production, which is essential for making mortar and plaster.The metallurgical industry heavily relies on limestone as an indispensable solvent. It aids in removing impurities during the smelting process of metals such as iron and steel. Limestone's high calcium content facilitates efficient desulfurization reactions by capturing sulfur compounds from exhaust gases emitted by power plants or industrial facilities.

 

 
Furthermore, after undergoing ultrafine grinding processes, high-quality limestone finds extensive applications across various sectors. In the paper industry, finely ground limestone acts as a filler material that enhances paper strength while reducing costs. Rubber manufacturers utilize it to improve product performance by enhancing elasticity and durability.Limestone's versatility extends into the realm of paints and coatings where it functions both as a pigment extender and an opacifier agent. Its fine particles help achieve desired color shades while providing excellent coverage properties when incorporated into paint formulations.
 

Limestone Industry Development Prospects

 

1.Limestone Consumption Status

Based on the current domestic and international demand for limestone, the global annual demand for limestone is approximately 360 million tons. However, 80% of this demand is attributed to general applications, indicating a relatively insufficient supply of high-quality lime in the market. Due to limited resources and low production capacity, there exists a significant gap in the market for high-quality lime.
 
In recent years, countries within the Asia-Pacific region have faced challenges related to insufficient domestic limestone resources, resulting in an annual import of over one million tons from China. This phenomenon primarily arises from rapid economic development in sectors such as construction, industry, and agriculture in the Asia-Pacific region that has led to an increased demand for high-quality building materials and fertilizer products. As a nation abundant in high-quality mineral resources, China has played a crucial role in meeting the requirements of other countries within the Asia-Pacific region. By collaborating with China and importing premium Chinese limestone, nations within the Asia-Pacific region can fulfill their developmental needs while enhancing infrastructure development, industrial production capabilities, and agricultural land improvement efforts. Simultaneously fostering economic progress also facilitates cooperation and exchanges among Central Asian nations.
 
However, it remains imperative to remain attentive to exploring alternative raw materials or technological approaches that can mitigate potential risks arising from global supply tensions regarding high-quality mineral resources. Only by combining innovative technology with sustainable development principles can we achieve a more balanced, stable, and sustainable pattern of global resource utilization.
 
 

2.Development Prospect

Lime, as a crucial raw material for industrial production, finds its primary applications in the metallurgy, chemical industry, building materials, and other key sectors of the national economy. It plays an indispensable role in driving market growth, expanding exports, generating employment opportunities, increasing farmers' income levels, and promoting urbanization development. Currently, lime is predominantly utilized in the metallurgy, chemical industry and building materials sectors. However, its usage is gradually expanding into other domains such as environmental protection (sewage treatment, dust removal), agriculture (soil amendment), and food industry (desiccant). As industries move towards fine specialization and diversification trends，the application scope of lime products will broaden further to stimulate demand within this sector. Particularly with heightened environmental awareness among individuals，lime holds promising market prospects within the environmental protection industry.
 

Comprehensively Developing and Utilizing Limestone

 

Used to Make Portland Cement

After the processes of crushing and grinding, limestone can meet the requirements for use as raw materials in cement production. The filling effect of limestone and its ability to form double salts with hydrated aluminate during the early stages contribute to enhancing the crystalline structure and stability of cementitious material. This leads to a rapid increase in crystal size, transforming into crystalline aggregates that strengthen the bond between cement components. Consequently, it may play an early strength role similar to gypsum in cement.
 

Production of foundry sand for machinery manufacturing

The cast sand produced from limestone has a grain size of 28~75 mesh, which exhibits superior performance compared to quartz sand. It possesses excellent collapsibility and is easy to clean out, thereby enhancing the surface quality and finish of castings while effectively eliminating the risk of silicosis. According to statistics, major steel companies alone annually procure tens of thousands of tons of casting sand, indicating a potential market for limestone mines in the metallurgical industry.
 

Use to Make Active Lime and Dull Lime

The calcination process of limestone produces active lime, which can be further processed to produce passivated lime. Passivated lime possesses the advantages of moisture absorption and excellent blowing performance. These two products have extensive applications in the metallurgical industry as sinter additives, slag making agents for steelmaking, desulfurization and dephosphorization agents for hot metal pretreatment. Additionally, refining slags tailored for different purposes based on specific requirements such as initial refining liquid composition and various continuous casting protection slags adjusted according to steel grades are designed.
 

Limestone Grinding Mill

 

PEX JAW Crusher

Capacity: 1-90 t/h
Feed Size: 250 mm
 
The PEX jaw crusher series exhibits the characteristics of high crushing ratio，uniform product size，simple structure，reliable operation，effortless maintenance and cost-effectiveness. It finds extensive applications in stone mining，the metallurgical industry，the building materials sector，road construction and railway infrastructure development as well as water conservancy projects and other related industries. This versatile equipment is capable of efficiently crushing various materials with a compressive resistance not exceeding 320MPa.
 
 

YGM Ultrafine Grinding Mill

Capacity: 0.2-45 t/h
Feed Sive: ≤20 mm
Powder Fineness: 325-3000 mesh
 
The Raymond mill is suitable for grinding a wide range of materials with a Mohs hardness below 9.3，including calcium carbonate，barite，dolomite，calcite，limestone，kaolin，bentonite，marble，gypsum ，quartz ，feldspar clay ，talc ，fluorite ，white mud mica refractory glass and approximately 1000 other types of materials.The standard configuration of the Raymond mill consists of the main engine、reducer、powder classifier、cyclone deduster、dust collector、blower、control cabinet、motor and pipe.Optional accessories include a crusher,bucket elevator,and feeder.
 

Working Principle
 
1. The HGM Raymond mill system consists of the primary mill, grading screening, product collection, and other essential components. The main machine features an integral casting base structure and can be equipped with a shock-absorbing foundation if necessary. The classification system adopts a mandatory turbine classifier structure, while the collection system utilizes pulse collection technology. 

2. Process flow of the pulverizing system: Special vehicles transport raw materials to a semi-open raw material shed where they are then shoveled by forklifts into the lower hopper. The materials are crushed by a crusher until they reach a size smaller than 40mm and subsequently lifted by an elevator to the storage hopper in front of the mill. Once emptied from the hopper, the material is evenly fed into the main machine for grinding via a feeder.The qualified products obtained during grinding undergo grading and screening through a classifier before entering the pulse dust collector via pipelines. After being collected by this dust collector, which boasts an impressive efficiency rate of 99.9%, these products are discharged through its lower end's discharge port and delivered to a powder storage bin as part of our open circuit design.For further processing according to specific requirements, users may proceed with additional steps after obtaining finished products from our HC large mill outputting substantial quantities that require transportation to powder storage tanks prior to packaging.
 

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