Maifan Stone Raymond Mill Grinding Processing: Complete Solution from Raw Ore to High‑Value Powder

Introduction

Maifan stone is a natural silicate mineral, scientifically classified as quartz monzonite, named for its speckled surface resembling cooked barley grains. This composite mineral, also known as a medicinal rock, is non‑toxic, harmless to living organisms, and possesses biological activity. It has held an important place in Chinese medical classics since ancient times—the Jin Dynasty’s Zhouhou Beiji Fang (Handbook of Prescriptions for Emergencies) by Ge Hong first documented maifan stone, incorporating it into medicinal formulations.

Maifan stone is rich in major elements such as potassium, sodium, calcium, and magnesium, as well as beneficial trace elements including zinc, iron, selenium, and copper. Its unique porous structure endows it with strong adsorption capacity and ion‑exchange ability, enabling it to adsorb heavy metal ions, bacteria, nitrites, phenol, and other harmful substances. It can also bidirectionally regulate water pH and release beneficial minerals into water.

These distinctive properties have led to widespread applications of maifan stone in healthcare, water purification, food processing, agriculture, wastewater treatment, cosmetics, and many other fields. To transform raw maifan stone into fine powders that meet the requirements of these diverse industries, the Raymond mill is an indispensable core piece of equipment.

This article provides a comprehensive overview of the maifan stone Raymond mill grinding system, covering equipment suitability, process flow, product specifications and applications, practical cases, and more.

I. Basic Properties of Maifan Stone and Grinding Requirements

1.1 Mineral Composition and Physicochemical Properties

Maifan stone is mainly composed of plagioclase (35%–40%), potassium feldspar (30%–35%), and quartz (20%–25%) , together accounting for over 80%; minor minerals include biotite and hornblende, totalling about 5%. Its main chemical components are inorganic aluminosilicates, including SiO₂, Al₂O₃, Fe₂O₃, FeO, MgO, CaO, K₂O, Na₂O, TiO₂, P₂O₅, MnO, etc.

The physical properties of maifan stone determine its processing method:

• Hardness: Mohs hardness approximately 6
• Density: About 2.3 g/cm³
• Melting point: Approximately 1750°C
• Structure: Porous sponge‑like structure with large specific surface area

1.2 Core Grinding Requirements

After maifan stone is processed into powder, downstream applications have different fineness requirements. From coarse powder to ultra‑fine powder, different mesh sizes correspond to different application scenarios. Therefore, a grinding system that can flexibly adjust product fineness, operate stably, and meet environmental standards is the core need for maifan stone processing enterprises.

II. Why Is the Raymond Mill an Ideal Choice for Maifan Stone Processing?

2.1 Perfect Match in Hardness and Moisture

Raymond mills are suitable for processing various non‑flammable and non‑explosive minerals with Mohs hardness below 7 and moisture content below 6%. Maifan stone, with a hardness of about 6, falls well within the mill’s capability. Moreover, maifan stone in its natural state generally meets the moisture requirement, eliminating the need for additional drying equipment.

2.2 Flexible and Controllable Product Fineness

By adjusting the speed of the air classifier, a Raymond mill can process raw maifan stone into powders ranging from coarse to ultra‑fine. Common specifications of maifan stone powder include 80–100 mesh, 100–120 mesh, 150 mesh, 180 mesh, 200 mesh, 325 mesh, 400 mesh, 500 mesh, 800 mesh, 1000 mesh, 1250 mesh, 2000 mesh, and more. This wide fineness adjustment range enables a single Raymond mill to serve multiple downstream industries.

2.3 Efficiency and Environmental Protection

Raymond mills offer advantages such as energy saving, high efficiency, and a small footprint. New‑generation models outperform traditional ones in output and energy consumption. With a three‑dimensional structure and strong system integration, from raw material coarse processing to conveying, grinding, and packaging, it can form an independent production system.

2.4 Proven Industry Practice

The Raymond mill is a common and proven choice in the maifan stone processing industry, with mature application cases in Hunan, Inner Mongolia, Ningxia, Liaoning, and other regions across China.

III. Complete Process Flow for Maifan Stone Raymond Mill Grinding

The Raymond mill grinding of maifan stone is a systematic production process that transforms raw ore into powders of different mesh sizes. It mainly involves raw material preparation, crushing, grinding, classification, and collection. The detailed process is as follows:

3.1 Raw Material Preparation and Crushing

Raw material screening: Raw maifan stone ore is preliminarily screened to remove impurities and large non‑target minerals, ensuring feed purity.

Coarse crushing: Large maifan stone (typically ≤30 mm) is crushed by a jaw crusher or cone crusher to a size suitable for the Raymond mill feed (generally ≤20 mm), preparing it for subsequent grinding.

3.2 Grinding and Classification – The Core Stage

Uniform feeding: The crushed material is conveyed by a bucket elevator to a storage hopper, and then fed uniformly, quantitatively, and continuously into the Raymond mill main unit via an electromagnetic vibrating feeder.

Main unit grinding: Inside the grinding chamber, a shovel blade lifts the material and feeds it between the grinding rollers and the grinding ring. Under centrifugal force, the rollers press firmly against the ring, crushing and pulverising the material through compression and friction. While revolving around the ring, the rollers also rotate on their own axes, creating an efficient comminution action.

Air classification: A blower blows air into the bottom of the grinding chamber, carrying the ground material upward to the classifier (air separator). Inside the classifier, rotating blades generate centrifugal force: larger particles are thrown back to the grinding chamber for re‑grinding, while fine particles meeting the fineness requirement are carried by airflow to the next stage.

3.3 Finished Product Collection and Dust Removal

Powder collection: The qualified fine powder, carried by airflow, enters a cyclone collector, where it is separated from the air and discharged from the discharge port as finished maifan stone powder. Additional screening equipment can be configured for further grading as needed.

Exhaust air treatment and dust collection: Very fine dust not captured by the cyclone collector is carried to a pulse‑jet bag filter, where it is filtered out, and clean air is discharged. The collected dust is either returned to the system or disposed of uniformly. The collection efficiency exceeds 99%, ensuring emissions meet environmental standards. The exhaust air system, via piping connecting the fan and the main unit, maintains a negative pressure inside the mill to prevent dust leakage.

3.4 Auxiliary Systems and Quality Control

Automation control: A PLC control system monitors operating parameters (e.g., temperature, pressure, current) in real time to ensure production stability.

Moisture and temperature management: The system controls moisture levels through air volume adjustment and recirculation to prevent clogging or agglomeration.

Quality inspection: Finished powder is tested by a particle size analyser to confirm it meets the target mesh specification; off‑spec material can be returned to the grinding chamber for re‑processing.

IV. Product Specifications and Downstream Applications of Maifan Stone Powder

4.1 Product Specification System

Maifan stone powder is available in a wide range of specifications, from coarse to ultra‑fine, covering application needs across various industries:

4.2 Main Application Areas

Healthcare: Maifan stone powder can be used to produce health products, with functions such as regulating metabolism, aiding digestion, diuresis, and liver protection. Ancient medical texts record it as “sweet, warm, non‑toxic, and effective for all ulcers and skin infections.”

Water purification and wastewater treatment: Utilising its adsorption capacity, maifan stone powder is used to produce water purifiers that adsorb free heavy metal ions and harmful substances from water.

Agriculture and animal husbandry: As a fertiliser additive, it promotes crop tillering and increases yield; as a feed additive, it promotes healthy livestock growth and improves feed utilisation.

Cosmetics industry: Maifan stone powder is used in face masks, handmade soaps, and other skincare products, accelerating metabolism.

Industrial and materials fields: It can be used in porcelain manufacturing, conductive filler preparation, and more.

V. Practical Application Examples

Case 1: Hunan 4R3220 Raymond Mill for Maifan Stone

Guilin Hongcheng collaborated with a large enterprise in Hunan. The customer purchased a 4R3320 maifan stone Raymond mill, which was successfully trial‑run and put into normal production. The customer expressed satisfaction with the equipment and service.

Case 2: Miluo, Hunan 4R3220 Raymond Mill Project

In January 2021, a customer in Miluo, Hunan, purchased a 4R3220 Raymond mill for maifan stone processing. It was installed and successfully commissioned. The mill features an integrated base design, ensuring extremely stable operation—“even a coin standing upright on the machine won’t fall while the rollers run at high speed.” Trial production of 40‑mesh maifan stone powder went smoothly, with all auxiliary machinery and parts operating properly.

Case 3: Multiple Applications Across Regions

Several users in Ningxia, Inner Mongolia, Liaoning, and other regions have installed Raymond mills for maifan stone processing. Customer feedback indicates that the entire workflow is smooth, the design is scientifically sound, and the sealing is effective, significantly reducing dust pollution.

VI. Selection Recommendations and Precautions

6.1 Key Selection Points

• Capacity requirements: Choose the appropriate model based on target output. Raymond mills range from 3R to 6R series, covering capacities from a few tons to dozens of tons per hour.
• Fineness requirements: For conventional fineness (80–400 mesh), a standard Raymond mill suffices; for ultra‑fine powders (above 800 mesh), consider an ultra‑fine Raymond mill or an additional classification system.
• Automation level: It is recommended to choose equipment equipped with a PLC control system for remote monitoring and automatic operation.
• Environmental configuration: A pulse‑jet bag filter system must be included to ensure dust emissions meet standards.

6.2 Operation and Maintenance Recommendations

• Regular maintenance: Regularly inspect wear parts such as rollers and rings, and replace them in time.
• Moisture control: Ensure feed moisture is kept below 6% to prevent clogging.
• Iron removal: It is advisable to configure iron removal equipment during raw material pre‑treatment to prevent ferrous impurities from damaging the rollers and rings.

Maifan stone, as a natural mineral with health benefits, adsorption properties, and biological activity, is seeing unprecedented opportunities in its deep‑processing industry. The global maifan stone market reached approximately USD 1.28 billion in 2025, with China contributing over 38% of the global share.

In the transformation of maifan stone from raw ore to high‑value powder, the Raymond mill, with its comprehensive advantages of hardness suitability, adjustable fineness, stable operation, and environmental compliance, has become the preferred grinding equipment in the industry. Whether for healthcare, water purification, agriculture, animal husbandry, or cosmetics, maifan stone powder processed by Raymond mills provides high‑quality raw material assurance for various sectors.

Choosing a high‑performance, well‑configured Raymond mill grinding system is not only key to improving processing efficiency and product quality but also a strategic move to position for growth in this rapidly expanding market.