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Sodium Sulphide ($Na_2S$), particularly in its yellow flake conformation, represents a foundational reducing agent and sulfidizing chemical across high-stakes industrial pipelines. Procurement agents face persistent challenges regarding concentration stability, heavy-metal contamination, and transport safety regulations. For decades, the global supply chain has relied on standard red flakes, which carry a higher iron content (often exceeding 1500 ppm). Modern high-efficiency leather-making processes, mineral flotation, and textile finishing plants demand high-purity yellow flakes with drastically reduced iron contaminants—typically under 30 ppm—to prevent permanent staining and optimize reagent reaction pathways.
Shandong Pulisi Chemical Co., Ltd. addresses this demand by providing high-specification Sodium Sulphide Yellow Flakes with a nominal purity profile of 60% Min. Our material features strict controls over insoluble matter, carbonate compounds, and iron trace metals. Our advanced drying and crystallization processes prevent rapid oxidation into sodium thiosulfate during container sea freight, ensuring that cargo shipped to South America, Africa, and East Asia arrives with its chemical activity fully intact.
| Chemical Property / Parameter | Typical Yellow Flakes Spec (60% Grade) | Low-Iron Premium Grade | Primary Application Context |
|---|---|---|---|
| Sodium Sulphide ($Na_2S$) Content | 60.0% Min | 62.0% Min | General reducing agent baseline |
| Iron ($Fe$) Content | ≤ 30 ppm | ≤ 10 ppm | High-grade leather, fine paper pulp |
| Sodium Carbonate ($Na_2CO_3$) | ≤ 2.0% | ≤ 1.5% | Alkalinity and chemical stability buffer |
| Water Insoluble Matter | ≤ 0.20% | ≤ 0.10% | Prevents nozzle clogging in spray systems |
Shandong Pulisi Chemical Co., Ltd. was established in 2006 (Stock Code: 307785). The company focuses on petrochemicals, mining chemicals, feed chemicals, and pharmaceutical chemicals. At present, the company has established long-term and stable partnerships with Fortune Global 500 companies such as China National Petroleum Corporation and Saint-Gobain. We always take customer demand as the core orientation and provide tailored solutions to help customers strengthen their market competitiveness.
The company has passed ISO9001:2015 Quality Management System Certification and German BV Certification, and has been awarded multiple honors such as Foreign-Oriented Economic Enterprise, Alibaba Demonstration Base, and Contribution Enterprise. In 2023, the company successfully went public with stock code: 307785.
The company upholds the corporate culture philosophy of "Customer First, Rapid Response; Striving as the Foundation, Efficient Collaboration; Integrity and Uprightness, Agile Adaptation." We focus on providing compliant and high-quality products and supporting services, and are committed to becoming a long-term and stable partner for customers.
Meanwhile, the company has established mature warehousing and distribution systems at key logistics hubs, including Qingdao Port, Tianjin Port, and Xinjiang border ports (Alashankou, Khorgos). We are able to provide flexible supply solutions according to customer needs to ensure timely order delivery. No matter where customers are located, Shandong Pulisi Chemical will safeguard their business development with professional service systems and efficient response capabilities.
Strict Statement: Shandong Pulisi has not established branches outside of Shandong Province. If there is any act of impersonating Shandong Pulisi, our company will reserve the right to pursue legal responsibilities.
In global mineral beneficiation, particularly copper-molybdenum-lead-zinc separations, Sodium Sulphide behaves as a critical sulfidizing depressant. The chemical action hinges on HS- and S2- ions chemisorbing onto mineral surfaces, altering their electrochemical potentials. In oxidized copper ores, the application of Pulisi's yellow flakes facilitates the quick sulfidization of malachite and azurite, converting their oxide surfaces into hydrophobic sulfide films. This transformation allows collectors like amyl xanthates to adsorb efficiently, resulting in copper recovery increases of up to 5-8% compared to lower-grade alternatives.
In the leather and tannery sectors, Pulisi's low-iron Sodium Sulphide Yellow Flakes are the benchmark for hair removal (the liming phase). The high pH generated by Na2S hydrolysis breaks the disulfide bridges of keratin present in hair fibers without damaging the dermal collagen network. The absence of heavy metals, especially iron, prevents the formation of dark iron sulfide complexes inside the hide pores. This ensures a clean, white, and blemish-free grain surface ready for subsequent chromium tanning processes.
The manufacturing process for Sodium Sulphide Yellow Flakes at Shandong Pulisi utilizes state-of-the-art coal-reduction or hydrogen-reduction technologies. Traditional methods revolve around the reduction of sodium sulfate ($Na_2SO_4$) with carbon sources at high temperatures (around 900°C to 1000°C). However, our facility integrates modernized gas-phase catalytic reduction and thermal concentration units to minimize carbon footprints while keeping iron content to a bare minimum. Advanced evaporation crystallization systems yield uniform yellow flakes, avoiding the thermal degradation typical of outdated rotary kiln procedures.
To support global sustainability mandates, Shandong Pulisi is investing in emission mitigation systems. Gaseous waste streams ($SO_2$ and $H_2S$) are captured inside closed-loop scrubbing columns, where they are reacted to synthesize sodium hydrosulfide ($NaHS$) and sodium thiosulfate ($Na_2S_2O_3$). This circular economy setup eliminates hazardous atmospheric discharge while creating secondary industrial feedstocks, aligning with corporate ESG metrics required by multinational enterprise clients.
Because Sodium Sulphide is classified as a hazardous chemical substance (Class 8 Corrosive, UN 1849, PG II), maritime transit requires strict regulatory compliance. Safe routing depends on packaging integrity and port infrastructure. Shandong Pulisi operates custom warehousing zones at China's dominant shipping hubs, including Qingdao Port, Tianjin Port, and strategic border dry ports such as Alashankou and Khorgos. By placing containerized stocks directly at the coast, we reduce container transit delays, allowing delivery times to international regions like South-East Asia or Western Europe to be shortened by 10 to 14 days.
Our packaging consists of heavy-duty, UV-stabilized, multi-layered 25kg PP/PE woven bags with inner hermetically sealed plastic liners, as well as 1000kg jumbo containers. These packaging methods prevent ambient air from entering, which would cause the product to deliquesce, oxidize, and release toxic hydrogen sulfide gas. Working alongside tier-one inspection organizations like SGS and Bureau Veritas (BV), we verify that all logistics configurations meet IMDG code standards before vessel departure.
Our industrial capacity allows us to manufacture and refine a wide range of chemical salts, including formates, acetates, and hydrosulfides.
Since 2006, our presence at international trade shows highlights our dedication to chemical manufacturing and customer collaboration.
Exporting to more than 100 countries and regions worldwide, serving large processing projects.
Over 20+ years of export experience, maintaining active partnerships with over 1,000 corporate groups.
Full ISO Certification, SGS validation, K-REACH pre-registration compliance, and FAMI-QS capability.
We provide stable pricing structures based on contract lengths and custom concentration needs.
Our dedicated warehouses at major ports enable rapid logistics response, reducing supply chain bottlenecks.
Experienced technical sales teams provide after-sales assistance and manage chemical import paperwork.
We work closely with industry leaders and logistics firms to maintain a reliable global distribution network.
Technical and logistics answers for sourcing agents and chemical engineers.
The main difference is the iron ($Fe$) content. Standard red flakes have higher iron levels (typically 1500+ ppm), which can cause black staining on leather and fibers. Our yellow flakes are formulated to keep iron below 30 ppm (and under 10 ppm for premium grades), preventing discoloration in delicate tanning and textile processes.
We package the product in multi-layered, hermetically sealed 25kg PP/PE bags with heavy-duty inner lining bags. For bulk shipments, we use 1000kg jumbo bags designed to block air and moisture, keeping the chemical stable during ocean transit.
We support businesses of all sizes. While our main shipments are organized by container load (FCL), we can coordinate smaller test batches to help build long-term purchasing relationships.
Yes, we provide OEM packaging services. Send us your vector files and design layouts, and our team will print the marking details to match your regional safety labeling requirements.
We accept several payment methods depending on order size and location, including Telegraphic Transfer (T/T), Letter of Credit (L/C) at sight, Documents Against Payment (D/P), and Open Account (O/A) for verified long-term clients.
We provide free product samples (typically 200g - 500g) for laboratory testing. You will only need to cover the courier shipping costs, which can be credited back to your first commercial order.
Yes, Shandong Pulisi products are certified and pre-registered under REACH and K-REACH. We supply safety data sheets (SDS) and official testing certificates to ensure compliance at your destination port.
You are welcome to visit our production facility in Zibo, Shandong Province, which is about a 1.5-hour drive from Jinan Airport. Please contact our sales team to coordinate your visit and security clearances.
Our industrial capacity supports global logistics and supply chain needs for key chemical compounds.
Pulisi