About us
Hangzhou Lanran Tech stands as a global leader in the manufacturing of ion exchange membranes, with an impressive annual output of 1,850,000m2.
We specialize in delivering tailored membrane solutions and advanced equipment to meet the specific needs of our clients, combining flexibility and efficiency with exceptional service.
Ventures
12
plants
4
sales offices
3
employees
380
R&D
5 R&D centers
170+ highly skilled technical professionals
40+ invention patents
60+ utility model patents
Lanran’s dedicated R&D team works closely with customers to develop solutions that precisely align with their application requirements. From laboratory-scale trials to pilot projects and full-scale industrial production, we offer comprehensive expertise across all stages of equipment development, including integrated modular systems.
Industry solutions
Suatainability
Sustainability drives our innovation. We develop solutions that help industries thrive while reducing their environmental footprint. From advancing the circular economy to combating climate change, our technologies focus on preserving natural resources, reducing pollution, and promoting responsible water management. Our vision is a future where industrial growth aligns with environmental stewardship, fostering sustainable progress for generations to come.
Team Building
“Industrial cleanliness, Resource Hanmony”
At Lanran, we believe strong teams create innovative solutions. Our team-building activities foster collaboration, creativity, and trust, ensuring a vibrant workplace culture that drives excellence. We cultivate the synergy to redefine separation and refine solutions, delivering cutting-edge technologies to our valued clients.
News
Silica Wastewater Treatment and Sodium Sulfate Recovery with LANRAN BPED Technology
Precipitated silica, also known as white carbon black, is widely used in rubber, plastics, coatings, and toothpaste. Manufacturers typically produce it by reacting sodium silicate with an acid. The process generates wastewater containing residual silica and sodium sulfate, especially during washing. Treating this wastewater creates two key challenges. Manufacturers need to recover water for production reuse and find value in sodium sulfate by-products. Conventional evaporation and crystallization can consume significant energy. Sodium sulfate solids may also have limited reuse options. Meanwhile, fresh sulfuric acid and sodium hydroxide add to operating costs. LANRAN’s Integrated Membrane Solution For a silica wastewater project in Xinjiang, China, LANRAN integrated membrane treatment, electrodialysis (ED), and bipolar membrane electrodialysis (BPED). This process combines water recovery with salt resource utilization. The integrated process includes five key steps: How BPED Technology Creates Value By integrating several membrane processes, LANRAN helps silica manufacturers recover water and turn dissolved salts into useful chemicals. An Industrial Solution for Silica Wastewater With a treatment capacity of 150 m³/h, this project demonstrates how LANRAN combines membrane separation, ED concentration, and BPED technology to address wastewater challenges in silica manufacturing. For silica producers, the integrated solution offers a practical approach to improving water reuse, recovering sodium sulfate resources, and reducing reliance on fresh process chemicals. Looking to recover water and valuable chemicals from silica wastewater? Contact LANRAN to explore membrane-based solutions for silica wastewater treatment, sodium sulfate recovery, and acid–alkali regeneration.
𝐒𝐨𝐝𝐢𝐮𝐦 𝐒𝐮𝐥𝐟𝐚𝐭𝐞 𝐏𝐮𝐫𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐢𝐧 𝐏𝐮𝐥𝐩 & 𝐏𝐚𝐩𝐞𝐫 𝐔𝐬𝐢𝐧𝐠 𝐁𝐢𝐩𝐨𝐥𝐚𝐫 𝐌𝐞𝐦𝐛𝐫𝐚𝐧𝐞 𝐄𝐥𝐞𝐜𝐭𝐫𝐨𝐝𝐢𝐚𝐥𝐲𝐬𝐢𝐬
In kraft pulp and paper production, chloride and potassium can accumulate in the chemical recovery cycle, increasing the risk of corrosion and scaling and affecting stable operation. For Dingfeng Paper, LANRAN applied Bipolar Membrane Electrodialysis (BPED) to remove part of the accumulated chloride and potassium ions from the sodium sulfate stream. The treatment process includes: Alkali Ash Dissolution → Filter Press → Ultrafiltration → Activated Carbon Adsorption → Ion Exchange → BPED After pretreatment, the BPED process further treats the sodium sulfate stream, with the resulting acid, alkali, and dilute brine streams directed to their respective downstream processes. The recovered alkali is reused within the mill’s chemical recovery and pulping system. This integrated solution helps:🔹 Control chloride and potassium accumulation🔹 Reduce the risk of corrosion and scaling🔹 Support stable operation of the chemical recovery system🔹 Recover and reuse chemical resources🔹 Reduce chemical consumption and wastewater generation By integrating BPED into the chemical recovery process, LANRAN supports more efficient salt management and chemical reuse in pulp & paper production.
17 Years of LANRAN: Built Through Technology, Projects and Partnerships
What does 17 years in membrane separation mean? For us, it means 17 years of working on real industrial challenges. From ion exchange membranes to electrodialysis technologies and industrial systems, LANRAN has continuously developed its capabilities through R&D, engineering practice, and cooperation with customers and partners. Over the years, we have applied membrane separation technologies to different industrial processes — including lithium and new energy, chemical processing, water reuse, resource recovery, and acid & alkali recovery. But no two industrial processes are exactly the same. That is why many of our solutions are developed through close technical discussions with customers — understanding their feed streams, process requirements, operating conditions, and resource recovery goals, then working together to identify a suitable membrane-based process. 17 years have given us experience.Our customers have helped us turn that experience into practical solutions.And continuous R&D keeps us moving forward. As we celebrate our 17th anniversary, we would like to thank our customers, partners, and colleagues who have been part of this journey.