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ZS-Cement Cr(VI) Reduction Grinding Aid (Yunnan)
Published time:
2026-08-26 08:19
Page Content
1. Title
Cement Cr(VI) Compliance & Strength Enhancement — ZS-Cr(VI) Reduction Grinding Aid Industrial Trial
2. Customer Background
A cement company in Yunnan operates a ∅4.5×13.5m roller press system with triple-separation closed-circuit mill, producing P·O42.5 cement. The customer faced excessive hexavalent chromium content (12.82 ppm) exceeding the national standard limit, posing environmental compliance risks and export trade barriers. Simultaneously, they sought to increase mill productivity without adding equipment.
3. Pain Points & Challenges
Cr(VI) Exceeds Standard: Blank period Cr(VI) content of 12.82 ppm exceeded the GB 31893-2015 limit (≤10 ppm).
Environmental Compliance Pressure: Excessive Cr(VI) could lead to product returns, environmental penalties, and export restrictions.
Chromium Reduction Must Not Sacrifice Output or Strength: The solution needed to reduce Cr(VI) while maintaining or improving mill productivity and cement strength.
4. Solution
In December 2021, Shengchuan's technical team conducted a ZS-Cr(VI) Reduction Grinding Aid industrial trial on the customer's ∅4.5×13.5m roller press system. This dual-function "grinding enhancement + chromium reduction" product's core mechanism converts water-soluble hexavalent chromium to insoluble trivalent chromium through chemical reduction reactions while simultaneously providing grinding aid benefits.
Grinding Aid Model: ZS-Cement Cr(VI) Reduction Grinding Aid
Dosage: 1,800–2,000g/t
Mix Proportion: Clinker 71.5%, gypsum 6.9%, limestone 3.5%, tuff 18.1% (unchanged throughout)
Trial Method: 16h baseline period + 24h transition period + 369h continuous trial production
5. Results Data
5.1 Cr(VI) & Output Comparison
|
Indicator |
Blank Period |
Trial Period |
Change |
|
Cr(VI) Content |
12.82 ppm |
8.78 ppm |
↓ 4.04 ppm (31.5%) |
|
Mill Output |
230 t/h |
244 t/h |
↑ 14 t/h (6.1%) |
|
0.045mm Residue |
7.9% |
7.2% |
↓ 0.7% (finer) |
|
Blaine |
345 |
355 |
↑ 10 |
5.2 Strength Comparison
|
Indicator |
Blank Period |
Trial Period |
Change |
|
3-Day Strength |
28.6 MPa |
33.5 MPa |
↑ 4.9 MPa |
|
28-Day Strength |
52.9 MPa |
59.7 MPa |
↑ 6.7 MPa |
5.3 369-Hour Continuous Production Data Stability
The trial period extended for 369 hours (approximately 15 days). Cement Cr(VI) content remained consistently below 8.78 ppm throughout with no rebound. Output and strength data also remained stable.
6. Case Summary
After adopting ZS-Cr(VI) Reduction Grinding Aid, cement Cr(VI) decreased from 12.82 ppm to 8.78 ppm (↓4.04 ppm), meeting the national standard. Simultaneously, mill output increased by 14 t/h (6.1%) and 28-day strength improved by 6.7 MPa. A single agent achieved the triple objectives of chromium compliance, output increase, and strength enhancement. The 369-hour continuous production data demonstrate stable performance, making this product suitable for general-purpose Portland cement production lines requiring Cr(VI) limit compliance.
7. Application Recommendations
Suitable Conditions: Cement production lines with Cr(VI) exceeding standards (≥10 ppm), requiring compliance with national or export standards while seeking simultaneous output and strength improvement.
Recommended Dosage: 1,800–2,000g/t.
Expected Results: Cr(VI) reduction of 30%–50%; output increase of 5%–10%; 28-day strength improvement of 5–8 MPa.
8. Related Products
ZS-Cement Cr(VI) Reduction Grinding Aid (product used in this case)
ZS-Hexavalent Chromium Reducer
ZS-High-Efficiency Enhanced Cement Grinding Aid
9. Call to Action
Shengchuan's technical team provides free industrial trial support. Contact us for a customized chromium reduction solution for your Cr(VI) levels and operating conditions.
📧 shengchuangj@163.com
📞 +86 156 8886 0208 (WhatsApp)
🌐 https://www.shengchuanintl.com
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