Integrated Sand and Powder Grinding Machine

Introduction to Integrated Sand and Powder Grinding Machine

The Integrated Sand and Powder Grinding Machine is a multi-functional integrated equipment innovatively developed on the basis of Raymond mill. It integrates grinding and sand-making functions. Through pre-screening and multi-layer square swing sieve process, it can produce fine sand while manufacturing powder. With unchanged system power and same energy consumption, the total output of sand and powder can reach 1.5~1.8 times that of simple powder grinding. The equipment is applicable for non-flammable and non-explosive materials with Mohs hardness ≤7 and moisture ≤6%, such as limestone, marble, calcite and other heavy calcium carbonate minerals. It is widely used in glass, rubber, pesticide, enamel, paint, phosphate fertilizer, papermaking and other chemical industries.

Features & Advantages of Integrated Sand and Powder Grinding Machine

Structural Features

Grinding & Separation System: Consists of grinding rollers, grinding rings, shovels and other grinding components. It is equipped with double-layer cover cylinder inclined plate chutes and double-row sand outlets. Coarse particles failing to meet fineness requirements are discharged from the main unit as bulk sand to realize sand-powder separation instead of all being returned for regrinding.

Classification & Powder Collection System: The classifier is installed on the top of main machine. The fineness of finished powder can be precisely controlled by adjusting rotor speed. Cyclone collector acts as primary powder collecting device, and pulse baghouse dust collector serves as secondary powder collection and dust removal unit.

Bulk Sand Screening System: Pre-screener carries out preliminary screening to separate particles of <0.1mm and >2.36mm. Multi-layer square swing sieve classifies bulk sand within 0.1~2.36mm.

Return Material Storage System: All unqualified products screened out are conveyed back to the main machine for regrinding via return conveying equipment. Separate powder silo and multiple groups of fine sand silos are configured to store finished powder and fine sand of different particle size ranges.

Fan Conveying System: Adopts circulating water cooling blower and high-pressure centrifugal fan, featuring large conveying capacity and effectively reducing equipment failure rate.

Performance Advantages

Dual-purpose in One Machine: Integrates powder grinding and sand making, synchronously producing 80~400 mesh powder and 20~120 mesh fine sand.

Energy-saving & High Efficiency: Under the same energy consumption as Raymond mill, the total sand & powder output is increased by 50%~80%.

Eco-friendly: New sealed roller assembly provides excellent sealing performance. The system runs under negative pressure in fully closed condition. Combined with pulse dust collector, no dust leakage occurs, and exhaust emission is far better than national standards.

High Recovery Rate: Unique return material design makes raw material utilization rate close to 100%, with almost no waste.

Flexible & Controllable: Sand-powder ratio can be precisely controlled. Fine sand products of different ranges including 20~40 mesh, 40~60 mesh, 60~80 mesh and 80~120 mesh are available for flexible adjustment according to market demands.

Process Flow of Integrated Sand and Powder Grinding Machine

Crushing & Grinding

Raw materials are crushed by crusher to particle size meeting feeding requirement of Integrated Sand and Powder Grinding Machine (≤35mm), lifted into silo by elevator, then fed into main unit of the machine via belt feeder. Shovels scoop materials and throw them onto material bed between grinding roller and grinding ring for pulverization.

Sand-Powder Separation

Ground materials are blown to classifier rotor for sorting. Powder meeting fineness standard passes classifier and enters cyclone collector for gas-solid separation, then recovered and purified by pulse baghouse dust collector. Settled finished powder is transported to powder silo for temporary storage via scraper conveyor and elevator.

Coarse particles failing classifier partially fall back to main machine for regrinding under gravity; others drop onto inclined plate chute of double-layer cover cylinder under centrifugal force, discharged from sand outlets on both sides of main machine as intermediate product (bulk sand).

Bulk Sand Screening

Bulk sand is conveyed by belt conveyor and elevator to three-way diverter, evenly distributed to pre-screener for primary screening. Pre-screener discharges particles of <0.1mm and >2.36mm as return material back to main machine for regrinding. Qualified bulk sand (0.1~2.36mm) is precisely classified into fine sand products of 20~40 mesh, 40~60 mesh, 60~80 mesh, 80~120 mesh by multi-layer square swing sieve. (Screening specifications can be flexibly adjusted according to market demand)

Storage & Material Return

Fine sand products of each particle range flow through chutes into scraper conveyor or screw conveyor, then lifted to corresponding fine sand silos by elevator for subsequent packing. All unqualified materials screened out are conveyed back to hopper via return conveying equipment and re-enter main machine for grinding, forming closed-loop circulation to synchronously produce 80~400 mesh powder and 20~140 mesh fine sand.

Application Scenarios of Integrated Sand and Powder Grinding Machine

GKSF Integrated Sand and Powder Grinding Machine features low operation cost and dual output in one unit. It is suitable for sand-powder co-production of most non-metallic minerals such as limestone. Its main finished product is powder with fine sand as by-product. For sand-powder co-production where fine sand serves as main product and strict requirement on sand particle shape is demanded, GKS sand making machine is recommended. It can efficiently produce sand and recycle tail powder generated during sand making. Compared with traditional Raymond mill + sand maker process, these two integrated solutions deliver higher cost performance and greater advantages.

Technical Parameters of Integrated Sand and Powder Grinding Machine

Frequently Asked Questions of Integrated Sand and Powder Grinding Machine

What is the difference between GKSF Integrated Sand and Powder Grinding Machine and GKS Sand Making Machine?

GKSF Integrated Sand and Powder Grinding Machine: Essentially a Raymond mill dominated by grinding. Its main finished product is powder with precisely controllable fineness of 80~400 mesh. Fine sand is a by-product with slightly poorer particle shape than that from GKS sand making machine.

GKS Sand Making Machine: Essentially a crusher dominated by crushing. Its main finished product is fine sand with excellent particle shape. Powder of 150~325 mesh is tail powder naturally generated in crushing process for recycling.

What advantages does Integrated Sand and Powder Grinding Machine have compared with Raymond Mill?

On the basis of retaining all functions of Raymond mill, the Integrated Sand and Powder Grinding Machine adds sand-making function to realize dual production in one machine. With the same energy consumption, the total output of sand and powder increases by 50%-80% with high raw material utilization rate.

How to adjust the discharge ratio of sand and powder of Integrated Sand and Powder Grinding Machine?

The sand-powder ratio can be controlled by adjusting classifier rotation speed and system air volume. Increasing classifier speed and reducing air volume will raise powder output; reducing speed and increasing air volume will boost sand output. Specific parameters need to be optimized according to material characteristics.

Can the bulk sand produced by Integrated Sand and Powder Grinding Machine be sold directly?

The "bulk sand" discharged from main machine is mixed particles with a wide particle size range (e.g. 2~200 mesh). It can be sold directly as an intermediate product. However, the common practice is to screen it via swing sieve into fine sand of different specifications such as 20~40 mesh and 40~80 mesh to meet demands of dry-mixed mortar, feed additives and other fields for higher profit.

How to adjust product fineness of Integrated Sand and Powder Grinding Machine?

The fineness of finished powder is mainly adjusted by changing the rotation speed of classifier. Higher speed produces finer powder. The grain size of finished sand is controlled and changed by replacing screen mesh of square swing sieve in screening system.