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Shandong Useen Calcium Co., Ltd. specializes in a range of products, including nano-scale calcium carbonate, food-grade calcium carbonate, calcium oxide, calcium hydroxide, and light calcium carbonate. Our company owns 17 fully automated calcium oxide production lines, three calcium hydroxide production lines, and nine calcium carbonate production lines. Its annual output is 200,000 tons for nano-calcium carbonate, 200,000 tons for calcium hydroxide, 160,000 tons for light calcium carbonate, 360,000 tons for heavy calcium carbonate, and 1 million tons for calcium oxide.
The global paper and pulp industry has undergone a monumental transformation over the past few decades, primarily driven by the shift from acidic to neutral and alkaline papermaking processes. In this technological evolution, Carbonate Calcium Powder has emerged as an indispensable raw material. Historically, papermakers relied on kaolin clay and talc as primary fillers, operating under acidic conditions that often led to paper degradation over time—a phenomenon known as "slow fires" in library archives. The introduction of alkaline papermaking, facilitated by sizing agents like Alkyl Ketene Dimer (AKD) and Alkenyl Succinic Anhydride (ASA), unlocked the ability to use calcium carbonate (CaCO3) as a primary filler and coating pigment.
Today, Carbonate Calcium Powder is utilized extensively to replace expensive wood pulp fibers. By integrating high-quality calcium carbonate into the paper matrix, manufacturers can significantly reduce production costs while simultaneously enhancing the optical and physical properties of the final product. The addition of calcium carbonate dramatically improves the paper's brightness, opacity, and bulk. Furthermore, because calcium carbonate is naturally alkaline, it provides an excellent buffer against acidic environmental factors, thereby drastically increasing the longevity and archival quality of the paper.
In modern pulp and paper mills, the strategic application of calcium carbonate goes beyond mere cost reduction. It plays a critical role in improving machine runnability. The porous nature of certain calcium carbonate structures allows for faster water drainage on the paper machine's wire section, reducing drying energy consumption and allowing for higher machine speeds. This synergy of economic efficiency, product quality enhancement, and energy savings positions Carbonate Calcium Powder as the cornerstone of contemporary papermaking.
In the paper and pulp industry, Carbonate Calcium Powder is broadly categorized into two main types: Ground Calcium Carbonate (GCC) and Precipitated Calcium Carbonate (PCC). Understanding the distinct properties of these two variants is crucial for papermakers aiming to optimize their formulations.
GCC is manufactured by mining high-purity limestone or marble ores, which are then crushed and finely milled to achieve the desired particle size distribution. In the papermaking sector, GCC is highly valued for its natural high brightness, broad particle size distribution, and low binder demand. When used as a coating pigment, GCC provides excellent rheological properties, allowing for high solids coating formulations. This results in superior surface smoothness and printability, making it ideal for coated woodfree papers and high-quality packaging boards. Furthermore, the robust nature of GCC particles contributes to the overall strength of the paper web.
Unlike GCC, PCC is a synthetic product created through a chemical precipitation process. Quicklime (calcium oxide) is hydrated to form milk of lime (calcium hydroxide), which is then reacted with carbon dioxide to precipitate calcium carbonate. This chemical synthesis allows manufacturers to engineer the specific crystal morphology (such as scalenohedral, rhombohedral, or aragonite) and particle size. In wet-end filling applications, scalenohedral PCC is particularly favored. Its unique rosette-like structure traps air, providing exceptional light scattering capabilities. This means that papers filled with PCC exhibit unparalleled opacity and bulk, which is highly desirable in premium uncoated woodfree papers, copy papers, and specialty printing grades.
The choice between GCC and PCC—or often, a strategic blend of both—depends entirely on the specific requirements of the paper grade being produced. While GCC offers excellent runnability and gloss, PCC provides superior opacity and bulk. The mastery of blending these two forms of Carbonate Calcium Powder is what defines top-tier paper manufacturing today.
Innovation is at the core of everything we do. In recent years, we have made significant investments in R&D, focusing on the development of new technologies and next-generation calcium products. Our company has established close "industry-university-research" cooperation relationships with well-known foreign industry experts, the Institute of Process Engineering of the Chinese Academy of Sciences, Tsinghua University, China University of Geosciences, Beijing University of Science and Technology, Shandong University, etc.
Through our industry-university-research partnerships, we have established strong capabilities in applied research, product development, and advanced process engineering. These collaborations allow us to continuously evolve, improve our formulations, and meet the changing demands of global industries.
The commercial landscape for Carbonate Calcium Powder in the paper and pulp industry is currently experiencing unprecedented growth. As global awareness of deforestation and sustainable forestry practices intensifies, the cost of virgin wood pulp continues to experience high volatility. This economic pressure has forced paper manufacturers to seek ways to reduce the fiber content in their products without sacrificing quality. Consequently, the industry has seen a steady increase in the "filler loading" rates. Decades ago, a filler content of 10-15% was standard; today, advanced paper mills are pushing filler levels beyond 25%, and in some specialty grades, up to 30% or more.
From an industrial perspective, the Asia-Pacific region, led by China, has become the dominant force in both the production and consumption of paper-grade calcium carbonate. The massive expansion of packaging board production, driven by the global e-commerce boom, has created a massive demand for high-quality GCC used in white-top linerboards. Simultaneously, the demand for high-quality tissue paper and specialty decorative papers has spurred the need for highly engineered PCC and Nano Calcium Carbonate.
Furthermore, the integration of onsite PCC plants (satellite plants) directly connected to paper mills has revolutionized the supply chain. By piping carbon dioxide emissions from the paper mill's own power boilers directly into the PCC precipitation reactors, the industry achieves a remarkable closed-loop carbon capture and utilization (CCU) system. This not only significantly reduces the carbon footprint of the paper mill but also drastically cuts down transportation costs, representing a perfect alignment of economic and environmental sustainability.
The versatility of Carbonate Calcium Powder allows it to be utilized across a vast spectrum of papermaking applications, each requiring specific chemical and physical properties.
In the production of copy paper, offset printing paper, and high-end book paper, calcium carbonate is the ultimate game-changer. The high brightness of the powder ensures vibrant text and image contrast, while its light-scattering ability prevents ink from showing through to the other side of the page (print-through). Nano-scale calcium carbonate is increasingly being used in surface sizing to create an ultra-smooth finish that rivals traditional coated papers.
As the world shifts away from single-use plastics, paper-based packaging is experiencing a renaissance. Heavy calcium carbonate is extensively used in the coating of folding boxboards (FBB) and solid bleached boards (SBB). It provides the necessary stiffness and a flawless printable surface required for high-end consumer goods packaging, cosmetics, and food containers. The application of calcium carbonate ensures that the barcode scannability and graphic reproduction on the packaging are of the highest standard.
While traditionally tissue paper relies heavily on pure pulp for softness, modern advancements have introduced specially modified calcium carbonate into the tissue matrix. This not only reduces pulp costs but can also enhance the water absorbency and tactile softness of the tissue, providing a premium feel at a lower production cost.
In decorative papers used for laminates and wallpapers, opacity is paramount to hide the underlying surfaces. High-loading of precisely engineered titanium dioxide combined with high-quality PCC provides the ultimate opacity and UV resistance, ensuring the longevity and vibrancy of the decorative prints.
Looking toward the future, the intersection of nanotechnology and papermaking chemistry is setting new benchmarks for the industry. Nano Calcium Carbonate is at the forefront of this revolution. Due to its ultra-fine particle size and massive surface area, nano calcium carbonate interacts with cellulose fibers at a microscopic level, significantly improving the internal bond strength of the paper. This mitigates the traditional drawback of high filler loading, which typically weakens the paper sheet.
Another major trend is Surface Modification Technology. Researchers are currently developing calcium carbonate particles coated with starches, polymers, or cellulose nanofibrils (CNF). These modified particles act not just as passive fillers, but as active binding agents within the paper web. This innovation promises to push filler loading limits even higher, potentially exceeding 40% in certain commercial paper grades, which would drastically reshape the economics of papermaking.
Environmental sustainability will continue to drive product development. The pulp and paper industry is actively transitioning towards "Green Manufacturing". The production of calcium carbonate itself is becoming more energy-efficient, utilizing renewable energy sources and advanced milling technologies that consume less electricity. As regulations regarding industrial emissions tighten globally, the role of calcium carbonate in capturing and utilizing industrial CO2 will solidify its status not just as an industrial mineral, but as a critical component of the global climate change mitigation strategy.
Welcome to Useen
Our materials are used across a wide range of industries including PVC pipes, automotive primers, paper, printing inks, wires and cables, sealants, rubber products, tyres, and more. Our clients rely on us for consistency, tailored solutions, and support in scaling their operations without compromising on quality. Our company is the first in China to apply nano calcium carbonate to PE blow molding products, which can replace traditional filling materials and has excellent performance.
Discover our full range of high-performance calcium carbonate solutions engineered for the paper and pulp industry and beyond.
