High Efficiency Vertical Roller Grinding Mill For Coal/ Limestone/Cement/Slag

High Efficiency Vertical Roller Grinding Mill for Coal/ Limestone/Cement/Slag

Description

The main component of limestone is calcium carbonate. Lime and limestone are a large amount of raw materials used in construction and industry. Limestone can be directly processed into stone and fired into quicklime. Quicklime CaO absorbs moisture or adds water to become hydrated lime. Hydrated lime is mixed into lime slurry, lime paste, etc., and used as coating material and brick and tile adhesive.

HVM vertical grinding machine
The HVM series vertical grinding machine is an energy-saving advanced grinding equipment developed by Hefei Hengcheng after more than 20 years of dedicated research and development, which integrates drying, grinding, grading, and conveying.
The Hefei Hengcheng HVM vertical grinding machine has advantages such as high grinding efficiency, low power consumption, large feed particle size, easy adjustment of product fineness, simple equipment process flow, small footprint, low noise, low dust, simple use and maintenance, low operating costs, and low consumption of wear-resistant materials.
This product solves the problems of low production, high energy consumption, and high maintenance costs of ordinary industrial milling machines. Its performance reaches the international advanced level and can replace expensive imported vertical mills, meeting the needs of large-scale, intelligent, and intensive industrial milling.

Vertical Mill Working Principle:

The electric motor drives the grinding disc to rotate through the reducer, and the material falls into the center of the grinding disc from the feeding port. At the same time, hot air enters the grinding chamber from the inlet. Under the action of centrifugal force, the material moves towards the edge of the grinding disc and is crushed by the grinding roller when passing through the circular groove on the grinding disc. The crushed material is carried up by the high-speed airflow at the wind ring at the edge of the grinding disc, and large particles directly fall onto the grinding disc for re grinding. When the material in the airflow passes through the dynamic and static separator, under the action of the rotating rotor, the coarse powder falls onto the grinding disc for re grinding. Qualified fine powder is discharged with the airflow and collected in the powder collection device, which is the product. Materials containing moisture are dried during contact with hot gases to achieve the required product moisture.

Technical Data

Re:The data based on Mohs'hardness 3-4 material

      Limestone Bond Index≤13kwh/t

Application Area
The HVM vertical grinding machine, with its scientific and reasonable design and unique structural advantages, is widely used for grinding various types of materials in various industries. The materials ground range from high humidity to dry, from exceptionally difficult to easy to grind, and the product fineness ranges from coarse to fine. The processed powder types are diverse, involving numerous industries:
① Moisture content of grinding materials: From materials with a moisture content of 20-30% (such as calcium carbide slag, brown coal, chalk soil, etc.) to materials with a moisture content less than 1% (cement clinker, etc.), the materials have strong adaptability;
② The grindability of grinding materials: from exceptionally difficult to grind (such as quartz sand, steel slag, slag, pyroxene, iron ore, etc.) to easily ground (such as gypsum, calcite, etc.);
③ Grinding product fineness: From 2-5mm (such as new wall material industry brick raw materials, construction industry sand grinding shale, etc.) to 15um with a pass rate of 97% (such as papermaking, chemical industry grinding heavy calcium, etc.), the control of product fineness is simple and easy;
The industries where HVM vertical grinding machines are applied include building materials, electricity, steel, energy, heat, chemical, coal chemical, non-ferrous metallurgy, lime kilns, mineral processing, and other industries.
The HVM vertical mill can process materials such as ferrite, slag, slag, cement, diamond, iron ore, chromium ore, manganese ore, gold ore, copper ore, aluminum ore, lead zinc ore, tantalum niobium ore, polymetallic ore, nickel ore, bauxite, silicon carbide, titanium dioxide, talc, bentonite, calcite, kaolin, graphite, mica, wollastonite, feldspar, dolomite, pyrophyllite, quartz sand, fluorite, limestone, organic silicon, lithium ash, shale, volcanic ash, coal, etc.

Technical advantages and characteristics
High grinding efficiency
Grinding efficiency is high, energy consumption is low, and compared to ball milling, energy consumption is 40-50% lower. It has a large single machine production capacity and can utilize low valley electricity.
High degree of automation
Adopting a PLC fully automatic control system and capable of remote control, it is easy to operate, easy to maintain, and reduces labor costs.
Stable product quality
The material stays in the grinding machine for a short time, reducing repeated grinding. The product has a uniform particle shape, narrow particle size distribution, good fluidity, strong adaptability, and a very low iron content, high whiteness and purity.
Low operation and maintenance costs
The grinding roller can be flipped out of the machine using a hydraulic device, making maintenance operations convenient. The grinding roller sleeve can be flipped over for use, extending the service life of wear-resistant materials with low wear. The lining plates of the grinding roller and grinding disc are made of special materials, which have a long service life.
Low noise environmental protection
The entire system has low vibration and low noise. It adopts an overall sealed negative pressure operation system, an air box pulse dust removal system, and no dust overflow, basically achieving a dust-free workshop.
Strong drying ability
Directly blowing hot air, the hot air comes into direct contact with the material inside the mill, with strong drying ability. The maximum moisture content of the feed can reach 15%, without the need for an additional dryer, saving equipment investment and energy consumption costs.
High reliability
Adopting a grinding roller limiting device to avoid severe vibration caused by material breakage in the mill, a new type of grinding roller sealing device is adopted, which is reliable and does not require a sealing fan, further reducing the oxygen content in the mill and achieving excellent explosion suppression performance.
Low comprehensive investment cost
Integrating crushing, drying, grinding, grading, and conveying, the process flow is simple, the structural layout is compact, and the land area is small, only 50% of that of ball milling. It can be arranged outdoors, with low construction costs, directly reducing investment costs.