Good news keeps coming, and innovation never stops! The two utility model patents independently developed and submitted by Henan Juyeh Chemical Equipment Co., Ltd. on April 16, 2025 — Eight-Effect Two-Stage Evaporator Unit for Sodium Aluminate Solution (Patent No.: ZL 2025 2 0714213.4) and Eight-Effect Three-Stage Evaporator Unit for Sodium Aluminate Solution (Patent No.: ZL 2025 2 0714415.9) — have recently successfully passed the examination of the China National Intellectual Property Administration and officially obtained patent grants!

This marks another technological coronation for Henan Jiuye Chemical in the field of alumina evaporation equipment. It is also a robust achievement of the company’s deep cultivation in energy-saving evaporation technology and efforts to tackle the industry’s high energy consumption pain points, further consolidating the company’s technological barrier in the efficient evaporation of sodium aluminate solution and injecting new impetus into the green and low-carbon transformation of the alumina industry.

1. Focusing on Industry Pain Points to Solve Energy-Saving Challenges in Evaporation

In the alumina production process, evaporation of sodium aluminate solution is a core energy-consuming link. Traditional evaporator units generally suffer from drawbacks such as high steam consumption, low temperature difference utilization rate, liquid entrainment, and insufficient condensed water recovery rate, which not only drive up enterprise production costs but also restrict the pace of the industry’s green development.

Targeting these common industry challenges, the R&D team of Jiuye Chemical has worked diligently, relying on years of experience in evaporation equipment design, manufacturing and operation and maintenance. The team has precisely conquered core technologies including multi-effect evaporation heat balance, staged temperature control and vapor-liquid separation. Building on the foundation of seven-effect evaporator technology, the company has successfully developed the patented eight-effect two-stage and eight-effect three-stage evaporator units, which are perfectly adapted to the low-concentration evaporation conditions of sodium aluminate solution and completely break the energy efficiency bottleneck of traditional evaporators.

2. Double Patent Endorsement: Full Analysis of Core Technical Advantages

The two newly approved patented technologies are iterative upgrades of Jiuye Chemical’s eight-effect evaporator series, featuring core strengths such as optimized structure, high energy efficiency, stable reliability and convenient operation and maintenance, fully meeting the production needs of alumina enterprises:

? Eight-Effect Two-Stage Evaporator Unit for Sodium Aluminate Solution

? Staged design: Adopts a two-stage feeding and discharging mode, equipped with eight-effect heating chambers + separation chambers and six-stage self-evaporation flash evaporators, forming a closed-loop solution concentration and steam circulation circuit to greatly improve evaporation efficiency.

? Thorough vapor-liquid separation: The split-type heating chamber and vapor-liquid separation chamber structure eliminates liquid entrainment and alkali leakage, ensuring qualified purity of condensed water that can be directly recycled to reduce water resource loss.

? Significantly reduced energy consumption and outstanding economic benefits: Relying on two core technological innovations — optimized temperature difference distribution and precise heat balance calculation — the eight-effect evaporator achieves a temperature difference equivalent to that of a seven-effect evaporator under high-concentration conditions when operating in low-concentration working conditions, with stable and risk-free operation. According to heat balance calculations, the steam-water ratio of the eight-effect evaporator unit is reduced by approximately 0.03 compared with the seven-effect evaporator unit. Taking an alumina plant with an annual output of 1.2 million tons as an example, the annual steam saving is about 150,000 tons. Based on the domestic average steam price of 180 yuan/ton, the annual steam cost saving reaches 27 million yuan; in regions where the steam price exceeds 300 yuan/ton, the annual steam cost saving is as high as 45 million yuan. Although the renovation investment increases by about 25 million yuan compared with the seven-effect evaporator unit, the investment payback period is less than seven months (excluding government energy-saving subsidies), featuring fast cost recovery and high returns.

? Eight-Effect Three-Stage Evaporator Unit for Sodium Aluminate Solution

? Three-stage precise temperature control: The three-stage evaporation process adapts to the treatment needs of sodium aluminate solutions with different concentrations, ensuring a more stable evaporation process and stronger material adaptability.

? Full automatic operation: Equipped with an intelligent control system, it realizes automatic regulation of temperature, pressure and flow throughout the process, reducing manual intervention and operation and maintenance costs.

? Upgraded durability: More reasonable structural design reduces equipment wear and failure rate, prolongs service life, and adapts to the long-term continuous production needs of enterprises.

Core Data Comparison: Seven-Effect VS Eight-Effect Evaporator

? Steam-Water Ratio Advantage: The eight-effect evaporator reduces the ratio by approximately 0.03 compared with the seven-effect one, achieving a new high in energy efficiency.

? Energy Saving Volume: For a 1.2 million t/y alumina plant, annual steam saving reaches 150,000 tons.

? Cost Benefit: Annual cost saving of 27 million yuan in average price areas, 45 million yuan in high-price areas.

? Investment Return: Incremental investment of 25 million yuan, payback period ＜ 7 months (excluding energy-saving subsidies).

3. 26 Years of Industry Deep Cultivation: Strength in Innovation Builds Reputation

Founded in 1999, Henan Jiuye Chemical Equipment Co., Ltd. is a high-tech enterprise and a "Specialized, Sophisticated, Unique and New" Little Giant Enterprise in Henan Province, integrating scientific research, design, manufacturing, installation and after-sales service. With 26 years of deep cultivation in the field of chemical evaporation equipment, it has long become a leading benchmark in the alumina evaporation equipment sector.

Adhering to the principle of "establishing the enterprise with technology and driving development through innovation", the company has built a professional R&D team and collaborated with universities and research institutes to tackle technical difficulties. At present, it has more than 40 national patents in total, accounting for nearly 99% of patents in the field of alumina evaporation technology. From seven-effect evaporators to eight-effect patented series, from domestic benchmark projects to overseas project implementation, Jiuye Chemical has fulfilled the responsibility and commitment of "Made in China" through continuous technological breakthroughs.

Relying on excellent product quality and a complete service system, the company has established long-term strategic cooperation with large groups such as Chinalco, Shougang, Luneng and Sinosteel. Its projects cover major alumina producing areas across the country, and it has successfully expanded to overseas markets including Indonesia and Guinea, with its technical strength highly recognized by the global industry.

4. Empowering the Industry with Innovation, Striving for a Green and Low-Carbon Future

The successful grant of the double patents is not only an honor but also a new starting point. Under the guidance of the "dual carbon" strategy, energy conservation and consumption reduction have become the core proposition for the high-quality development of the chemical and aluminum industries.

Taking this patent breakthrough as an opportunity, Jiuye Chemical will continue to increase R&D investment, accelerate the transformation and market promotion of the patented eight-effect evaporator series technology, and provide more alumina enterprises with customized, high-efficiency and low-energy consumption evaporation equipment solutions. The company will help enterprises reduce costs, improve efficiency and achieve green transformation, and push the evaporation technology of the entire aluminum industry to a higher level.