Kostanay, a region in northern Kazakhstan, is increasingly recognized for its agricultural potential, particularly in soil remediation and organic farming. One of the key natural resources driving this transformation is weathered coal, which is rich in humic acid—a critical component for improving soil structure, water retention, and nutrient uptake. To efficiently process weathered coal into high-quality humic acid powder, the Lm1700 Vertical Roller Mill (VRM) from Shanghai Zenith Machinery Co., Ltd. has emerged as a game-changing solution. With a capacity of 24 tons per hour (TPH) and an output fineness of 100 mesh (D80), this mill is tailored for the specific needs of humic acid extraction in Kostanay.

Why Lm1700 VRM for Weathered Coal?

Weathered coal, also known as leonardite, is a low-rank coal that contains high concentrations of humic substances. However, its abrasive nature and variable moisture content require a grinding solution that is both durable and efficient. The Lm1700 Vertical Roller Mill is engineered to handle such challenging materials. Its core design integrates grinding, drying, and classification in a single unit, reducing the need for auxiliary equipment. For a 24 TPH target at 100 mesh D80, the Lm1700 VRM offers an ideal balance of throughput and fineness control, ensuring that the humic acid extraction process yields maximum purity and consistency.

Key Technical Parameters

• Capacity: 24 TPH (for weathered coal with moisture up to 20%)
• Output Fineness: 100 mesh D80 (adjustable from 80 to 400 mesh)
• Input Size: Up to 70 mm
• Main Motor Power: 355 kW (with high-efficiency reducer)
• Production System: Continuous 24-hour operation, fully automated

Advantages for Humic Acid Extraction

Humic acid extraction typically involves a multi-step process: grinding, chemical activation, and filtration. The Lm1700 VRM optimizes the first step—reducing weathered coal to a uniform fine powder. The mill's bed formation grinding principle ensures that particles are crushed between rollers and the grinding disc, minimizing over-grinding and preserving the molecular structure of humic acid precursors. Additionally, the integrated classifier can achieve a narrow particle size distribution, which is critical for subsequent extraction efficiency. Compared to ball mills, the Lm1700 VRM consumes 60% less energy and occupies 50% less floor space—a significant advantage for operations in Kostanay where space and power costs are factors.

Automation and Remote Control

In remote locations like Kostanay, ease of operation is paramount. The Lm1700 VRM is equipped with an advanced PLC control system that allows for remote monitoring and parameter adjustments. Operators can set the fineness (e.g., 100 mesh D80), adjust separator speed, and monitor mill vibration in real-time. This reduces the need for on-site technical staff and ensures consistent product quality even with changing feed conditions.

Environmental Compliance in Kostanay

Kazakhstan's environmental regulations, especially concerning dust emissions and noise, are stringent. The Lm1700 VRM operates under negative pressure with a sealed system, ensuring zero dust spillage. The mill is equipped with a pulse dust collector that meets EU and CU-TR standards (certified by Zenith's ISO and CE certifications). Furthermore, the low noise level (below 85 dB at 1 meter) makes it suitable for installations near residential or agricultural zones.

Integration with Humic Acid Production Line

A typical humic acid extraction line in Kostanay would include:

1. Crusher (for reducing weathered coal to below 70 mm)
2. Lm1700 VRM (grinding to 100 mesh D80 at 24 TPH)
3. Mixer/reactor (for alkaline extraction of humic acid)
4. Centrifuge or filter press (for separation)
5. Dryer and packaging system

The VRM acts as the bottleneck-solver, delivering consistent powder quality that maximizes humic acid yield. With Zenith's global experience—over 180 countries and 30 overseas offices—the company provides on-site commissioning and training in Kostanay, ensuring a smooth startup.

Cost-Effectiveness and ROI

For a 24 TPH weathered coal grinding operation, the Lm1700 VRM offers a payback period of under 18 months, based on typical energy savings of 40-50% compared to traditional ball mills. The reduced maintenance costs (no grinding media replacement) and long wear life (roller sleeves up to 8000 hours) further enhance ROI. In the context of Kazakhstan's growing humic acid market—driven by organic farming exports—this investment positions producers for competitive advantage.

FAQ

1. What is the maximum moisture content of weathered coal that the Lm1700 VRM can handle?
   The mill can process weathered coal with moisture up to 20% when equipped with a hot air generator for drying. For higher moisture, a pre-drying step is recommended.
2. Can the Lm1700 VRM produce finer than 100 mesh for humic acid extraction?
   Yes, the mill can adjust output fineness from 80 mesh to 400 mesh by changing the classifier rotor speed. Finer powder (e.g., 200 mesh) may reduce throughput but enhances extraction yield.
3. What certifications does the Lm1700 VRM have for import into Kazakhstan?
   The mill holds ISO 9001, CE, and CU-TR certification, which facilitates customs clearance and compliance with local standards.
4. How long does it take to install and commission the mill in Kostanay?
   Typical installation and commissioning take 4-6 weeks, depending on site readiness. Zenith provides a team of 2-3 engineers on-site for the entire period.
5. What is the power consumption per ton for grinding weathered coal to 100 mesh?
   Under normal conditions, the specific power consumption is 18-22 kWh per ton, which is about 60% lower than a ball mill of similar capacity.
6. Does the Lm1700 VRM require a special foundation?
   It is designed with a compact integrated structure that requires a relatively simple concrete foundation, sized approximately 8m x 6m x 1.5m, which is about half the area needed for a ball mill system.
7. Can the mill be integrated with existing humic acid extraction equipment?
   Yes, the mill outputs powder through a standard rotary valve or pneumatic conveying system, easily connecting to existing mixers and reactors in the extraction line.

For more detailed specifications or a customized quotation for the Lm1700 VRM for your weathered coal project in Kostanay, contact Shanghai Zenith Machinery Co., Ltd. through our global offices or visit our website.