In coating buckets, it imparts enduring, vibrant shine to architectural facades; in plastic products, it forms a robust barrier against UV rays; and in inks, it captures memories that never fade—this substance, known as the "king of white pigments," is none other than titanium dioxide. As a strategic foundational material with global annual demand exceeding 4.6 million tons, titanium dioxide’s industrial chain spans from mineral extraction and chemical manufacturing all the way to end-use applications. Its technological advancements and evolving industry dynamics have profoundly shaped the development trajectories of eight major industrial sectors, including coatings, plastics, and papermaking.

　　 I. From Ore to Pigment: The Technological Battle Over the Process Route

　　The core component of titanium dioxide is titanium dioxide (TiO₂), and its production processes are broadly divided into two major camps: the sulfuric acid process and the chloride process. The sulfuric acid process uses ilmenite as the raw material, which undergoes acid hydrolysis with concentrated sulfuric acid to produce titanium oxy sulfate. This intermediate is then processed through 12 meticulous steps—including hydrolysis, calcination, and surface treatment—to ultimately yield the final product. While this method requires relatively low equipment investment and has readily available raw materials, it suffers from drawbacks such as a lengthy production flow, high energy consumption, and significant emissions of "three wastes." As the world's largest producer of titanium dioxide using the sulfuric acid process, China accounted for 58% of global capacity in 2024. However, its energy consumption per unit of product remains 15%–20% higher than the internationally advanced standards.

　　The chlorination process uses rutile or high-titanium slag as raw materials, reacting them with chlorine gas at a high temperature of 1000°C to produce titanium tetrachloride. The product is then refined through steps such as gas-phase oxidation and surface treatment. This method boasts advantages like a short production流程, high automation levels, and product purity exceeding 99.5%. However, it demands highly corrosion-resistant equipment, and the investment for a single production line exceeds 2 billion yuan. Currently, global chlorination-based production capacity accounts for 53%, with international giants like DuPont and Chemours dominating the high-end market. In China, only a handful of companies—such as Longbai Group—have mastered the core technology.

　　The debate over the technological approaches of the two processes essentially comes down to a trade-off between cost and quality. The sulfuric acid process achieves lower costs through large-scale production, but its products are mainly used in the mid-to-low-end market. In contrast, the chloride process, though requiring higher technical expertise, enables the production of specialized products such as automotive paints and high-end plastics. In 2024, China's titanium dioxide exports grew by 15.8% year-on-year; however, the average import price was 1.8 times higher than the average export price, highlighting the reality that China still relies heavily on imports for premium-quality products.

　　 II. Performance Password: Microstructure Determines Macro Applications

　　The performance differences of titanium dioxide stem from the microscopic variations in their crystal structures. The rutile-type crystals exhibit a prismatic twin structure with a refractive index as high as 2.71, offering a coverage power 1.5 times greater than that of the anatase type. In contrast, the anatase type features a regular octahedral structure, boasting strong photocatalytic activity but poorer weather resistance. These distinct characteristics directly determine their respective application scenarios: 90% of automotive paints rely on the chloride-process rutile type, while indoor coatings predominantly use the sulfuric-acid-process anatase type.

　　Surface treatment technology is the key to unlocking the full potential of titanium dioxide. By coating the particles with inorganic materials such as aluminum, silicon, and zirconium, a dense oxide layer measuring 0.5–2 μm can be formed, enhancing the product's weather resistance to over 10 years. Japan’s Ishihara Industries CR-57 model employs an advanced aluminum-zirconium composite coating technique, enabling the product to maintain stable performance even under extreme temperature conditions ranging from -20°C to 60°C—making it a benchmark product in the high-gloss latex paint industry. Meanwhile, organic silicon coating technology reduces surface energy, boosting the dispersibility of titanium dioxide in plastics by up to 30% and significantly improving the mechanical strength of the final products.

　　Controlling particle size distribution is truly a "micron-level art" in titanium dioxide manufacturing. Ideally, the particle size should be concentrated within the 0.2–0.4 μm range, as this ensures optimal light-scattering efficiency. Longbai Group has developed a分级研磨 (graded grinding) technology that keeps the standard deviation of the product’s particle size distribution below 0.05 μm, boosting coating opacity by 12% and allowing for a 20% reduction in titanium dioxide usage at the same coating thickness.

　　 III. Industry Landscape: China's Manufacturing Breakthroughs and Challenges

　　China's titanium dioxide industry is undergoing a transformation, shifting from sheer scale expansion to a focus on quality enhancement. By 2024, the industry's production capacity reached 4.86 million tons, maintaining its position as the world's largest for five consecutive years. However, the self-sufficiency rate for high-end products remains below 40%. Meanwhile, industry concentration continues to rise, with the top five companies accounting for 65% of total production capacity. Notably, Longbai Group leads globally with an annual output of 1.19 million tons, and its chloride-process products have already made their way into the supply chains of automotive giants like BMW and Tesla.

　　Environmental pressures are driving technological upgrades. The newly implemented "Titanium Dioxide Industry Pollutant Emission Standards" in 2025 have tightened particulate matter emission limits to 10 mg/m³, prompting companies to increase their investments in environmental measures such as waste acid recovery and exhaust gas treatment. For instance, CNNC Titanium Dioxide has invested 1.2 billion yuan to build a chloride-process production line that achieves a 98% recycling rate for waste acid through membrane separation technology, reducing carbon emissions per unit of product by 40% compared to the sulfuric acid process.

　　Expanding application areas is unlocking new growth drivers. In the new energy sector, iron phosphate lithium precursor materials derived from titanium dioxide are now supporting the expansion of power battery production capacity. Meanwhile, in the environmental protection field, photocatalytic titanium dioxide can effectively decompose nitrogen oxides in the air, emerging as a powerful new tool for tackling smog. By 2024, the market size for functional titanium dioxide has surpassed 8 billion yuan, with an annual compound growth rate reaching 15%, making it the industry's latest engine for growth.

　　From Norway's pioneering industrial production in 1918 to today's deeply integrated global supply chain, the century-long evolution of titanium dioxide reflects humanity's relentless pursuit of material performance excellence. As Chinese manufacturing has made a remarkable leap—from following others in chloride-process technology to now running side by side with global leaders—and as nanoscale titanium dioxide begins to find applications in cutting-edge fields like quantum-dot displays and biomedicine, this "white kingdom" is boldly writing a new chapter of its own.