Overview of China’s Kieserite and Magnesium Sulfate Industry

If you plan to source Kieserite and Magnesium sulfate in China, it’s worthy to understand the China’s magnesium fertilizer industry.

Introduction to Kieserite and Magnesium sulfate Fertilizers:

Kieserite are an compound fertilizer containing both sulfur (S) and magnesium (Mg) as secondary nutrients. They serve as vital soil conditioners and plant nutrient supplements in agricultural production.Its core functions include replenishing soil magnesium (reducing leaf chlorosis and enhancing photosynthetic efficiency), supplementing sulfur (promoting protein synthesis and improving crop quality), while also regulating soil PH and improving soil structure. It is particularly effective for ameliorating special soil

conditions such as saline-alkali and acidic soils.

Overview of China’s Kieserite and Magnesium sulfate Industry (Upstream Resources—Production Areas—Products)

Upstream Resources:
Magnesite is the most critical raw material ore for industrial production of Magnesium Oxide, Magnesium Chemicals as Kieserite powder, Kieserite granular fertilizers, Magnesium Sulfate, and refractory materials. Global proven magnesite reserves total approximately 3 billion tons, with China ranking as the world’s largest magnesite resource holder, accounting for over 70% of global proven reserves. Within China, magnesite reserves are highly concentrated in Liaoning Province, accounting for 85.6% to 90% of the national total, where primarily distributed in Yingkou, Anshan, and other areas; for instance, the magnesite reserves in the Dashiqiao region constitute over 70% of the province’s total). The remaining small quantities are distributed across Shandong, Hebei, Tibet, Xinjiang, and other provinces and regions.

Origin Production Areas:
Liaoning has been a most important province for China’s magnesite ore because of excellent quality with high magnesium oxide content (typically above 40%), easy to mine and process and serves as the primary raw material source for China’s primary magnesium production. Liaoning leads globally in magnesite reserves, output, and exports. The core hub of China’s magnesium chemical industry of Liaoning is Yingkou’s Dashiqiao, which “risen and thrived all through Magnesium.” Magnesium products and chemical sector in Dashiqiao, Yingkou boasts a long history, featuring a fully integrated industrial cluster encompassing upstream raw materials, deep processing, and foreign trade. Dashiqiao leads nationally in the number of magnesium-related enterprises, industrial output value, and export earnings. Yingkou Dashiqiao in Liaoning holds absolute dominance both nationally and globally. It’s said that “The world magnesium ore looks to China for, and China magnesium ore looks to Liaoning, that’s why Dashiqiao Yingkou earns the titles “China’s Magnesium Capital” and “World’s Magnesium Capital.”

Products:  

In terms of product structure, sulfate-based magnesium fertilizers dominate China’s magnesium fertilizer market (holding a 78% market share in 2023). This dominance stems because of magnesium sulfate’s excellent solubility, high plant availability, mature production processes, and relatively low costs in production. Moreover, fully water-soluble magnesium sulfate and controlled-release magnesium sulfate granules are experiencing significant growth (maintaining an annual growth rate above 12%). These are primarily used in modern agricultural facilities and water-fertilizer integration systems, enhancing fertilizer utilization and reducing nutrient loss. Industrial by-product magnesium sulfate fertilizers account for approximately 15% of the market, primarily sourced from industries like titanium dioxide and rare-earth production. Such sort of sulfate magnesium though keeps lower purity; offer significant cost advantages and are suitable for agricultural applications with less stringent quality requirements.

Kieserite & Magnesium Sulfate Manufacturer and Exporter Enterprise Representative in Dashiqiao, Yingkou, Liaoning, China

Rongqing Chemical’s Kieserite and magnesium sulfate plants are located in Yingkou’s core magnesite mining district. The Kieserite fertilizer plant spans 50,000 M² with 55 employees, operating five modern granulation production lines achieving a daily output of 500 tons. The magnesium sulfate plant has an annual capacity of 20,000 tons. We not only manufacture but also provide OEM/ODM services for leading global fertiliser brands and distributors. Annually, 30,000 tons of Kieserite fertilizer and magnesium sulfate are exported by Rongqing Chemical to countries and regions worldwide (Rongqing Chemical’s export business accounts for 75% of total operations).

We warmly welcome global buyers and clients to contact Rongqing Chemical—China’s source factory for Kieseritefertilizer and magnesium sulfate—to discuss cooperation opportunities.