Drying and Grinding Processing

Grinding Process

Drying is a method of preserving food by removing water from the food, which inhibits the growth of micro-organisms and makes putrefaction more difficult. Bacteria, yeasts and fungi need water in the food to grow. Drying effectively prevents them from surviving in it. The grinding methods are divided into two:

  • Dry milling: This type of milling is carried out with totally dry materials or with very low humidity.
  • Wet milling: The product to be milled may have moisture in it from the beginning or it may be moistened at some stage of the process.
Grinding Process

Dry milling

In order to increase the surface area of any solid, it is necessary to provide energy to the product by means of mechanical elements. To tackle both abnormal phenomena produced in any type of grinding (temperature and particle control), TecAIRE – NEOCAFÉ ENGINEERING presents the MS separator mill with which it is possible to grind at low temperature and control the particle size before it is extracted from the grinding chamber.

Mill MS-400

Separating mill to process particles up to 10MY

It has an independently driven grinding disc and separator, thus, by choosing the appropriate parameters and grinding elements, it can be used for all types of products by changing the internal elements of the classifier or mill.

The grinding disc can be equipped with different elements obtaining an impact, cutting or friction effect. The output size regulation is achieved by adjusting the speed and the air flow rate processed by the mill.

The grinding plant consists of a feeding system, a mill, a filter collector and a fan for cooling and conveying the product from the grinding chamber to the filter. Depending on the nature of the product and the final size required, it is possible to use a cyclone between the mill and the filter. The MS mill manages to minimise the temperature rise to very low levels, thus allowing the processing of materials with relatively low softening or melting points, e.g. stearates, resins or pharmaceutical intermediates.

Hub MS-400

The heart of this separator mill is a combination of a grinding plate with pins or hammers and a classifying wheel (separator) driven by separate mechanical units controlled by frequency converters.

Mill MS-1500

The MS1500 and M2000 milling units are specially manufactured to process products where the need for production and fineness are very high, these processing units work at production rates of 10-20 Tn/hr and finenesses between 10 and 100 My. The power of the main motors ranges from 150 to 220 C.V. and their air flow rate from 14 to 20.000 m3/hr.

Grinding with continuous mechanical mills allows grinding of products with a hardness of up to 4 Mohs scale.

Technical Characteristics

Diámetro molinomm.1853253254944947747749709701168
Diámetro clasificadormm.112195195296296470470580580684
Potencia molinoKw.37,51122304555110160160
Potencia clasificadorKw.0,371,11,1447,5111518,537
Velocidad molinor.p.m. min.6000300030001500150010001000800800800
r.p.m. max.10800720072004700470029002900260026002200
Caudal airem3/h min.20060090015002500300040006500800012000
m3/h max.3259001350324042006300720096001440019000
Factor de producción0,211,352,73,65,46,75913,518

Diagram of grinding and solids separation line

The process diagram shows a pneumatic suction conveying circuit where we incorporate a rotary valve for product feeding, an MS separator mill where the particle reduction effect and particle size selection is carried out, a jet filter that separates the solids from the conveying air and a centrifugal fan that we use to classify the product and transport it to the filter.

This type of process units are used for the grinding and classification of products used in sectors such as food, minerals, phytosanitary products, paints and pigments, chemicals, etc.

Diagram of grinding and solids separation line

Ácido Tartárico100% < 60 My400 Kg/hrMS - 100
Algarroba tostada100% < 74 My2000 Kg/hrMS - 1500
Azucar100% < 60 My3000 Kg/hrMS - 400
Baquelita99% < 2000 My450 Kg/hrMS - 300
Cacao 10/11%99% < 74 My4000 Kg/hrMS - 1500
Carbón100% < 40 My150 Kg/hrMS - 150
Carbonato cálcico99% < 100 My5000 Kg/hrMS - 1500
Colorante cerámico99% < 40 My400 Kg/hrMS - 300
Dolomita99% < 1000 My6500 Kg/hrMS - 1500
Epoxy99,5% < 100 My700 Kg/hrMS - 400
Estearatos100% < 40 My1500 Kg/hrMS - 1000
Garrofín100% < 74 My150 Kg/hrMS - 1000
Harina100% < 250 My750 Kg/hrMS - 600
Harina pescado100% < 800 My7500 Kg/hrMS - 1500
Herbicidas100% < 40 My500 Kg/hrMS - 400
Hidróxido aluminio100% < 20 My450 Kg/hrMS - 400
Naranjita100% < 200 My250 Kg/hrMS - 300
Pigmentos100% < 10 My500 Kg/hrMS - 200
Pimentón100% < 600 My650 Kg/hrMS - 1000
Pimienta99% < 700 My600 Kg/hrMS - 400
Producto farmacéutico100% < 10 My30 Kg/hrMS - 20
PVC (emulsión)100% < 60 My800 Kg/hrMS - 600
Resina novolaca100% < 100 My2500 Kg/hrMS - 750
Resina urea99% < 40 My2000 Kg/hrMS - 600
Rojo carmín100% < 20 My125 Kg/hrMS - 100
Soja en grano99% < 125 My600 Kg/hrMS - 600
Talco99% < 10 My1500 Kg/hrMS - 1500
Yeso99% < 100 My6000 Kg/hrMS - 2000