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SALT PROCESSING AND REFINERY PLANTS – SODIUM CHLORIDE
SALTWORKS - SEA SALT

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Salt Processing plants

Manfredini & Schianchi offers to Domestic & International investors the experience developed during the years, with technology providing the complete range of machinery for sea salt and rock salt treatment, in every processing stage:

• Washing
• Spin drying
• Milling
• Drying
• Screening
• Colour sorting
• Bagging
• Packaging
• Palletising

The above processing stages require machines and equipment capable of preventing the formation of impure particles and allowing a completely automatic work cycle.

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Herewith you will also find the economic report of such investment capable to provide a high added value to the several final products.

Introduction to Salt Processing Plants

A plant designed with the abovementioned processing stages presents the following characteristics:

- An output of 30 Tons/hr. of washed salt and 15 Tons/hr. of dried salt
- An overall area of 13,000 m2 of which 2,400 m2 must be covered.

Under the covered area the drying, screening, packing and palletising machines will be installed, as well as the dried palletised products. The open area will include the washing plant, the stockpile of coarse salt to be processed, the water draining tanks and the storage of palletised bagged products.

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There will also be an area for the main cabin with 600 kW power and supply group with 150 kW power, in case of power cut.

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We hereby briefly describe the work phases that have been listed above:

Salt Washing

This can be considered as the most important stage during which the salt loses certain chlorides that precipitate in salt processing. At the beginning the salt is automatically placed in a vat previously filled up with saturated water, in order to be washed. I

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n the vat, the salt is freed from all the impure particles, which are particularly light and rise towards the surface to pass into the draining tanks. Furthermore, by means of electro-pumps of appropriate power and pressure, 50% solution of salt and water is forwarded to the centrifugal unit.

Salt Spin Drying

Centrifuga Ferrum

Ferrum Centrifuges

This process is carried out through continuous charge 900 rpm. Speed hydroextractors that free the salt of the water it contains, in order to achieve approximately a 4% humidity.
The abovementioned water-salt solution coming from the washing vat is then drawn into the extractor by the electropumps.

Krauss-Maffei Pusher Centrifuges SZ

Krauss-Maffei Pusher Centrifuges SZ

Krauss-Maffei Pusher Centrifuges SZ

The centrifugal force of hydroextractors provides the water separation and the salt falling with a very low relative humidity.
The water retired returns to the washing vat and the salt is ready to be triturated or ground..

Salt Grinding

This is a particular stage, necessary to satisfy the market demands concerning the fine salt sector
This stage is obtained through a series of mills which receive the salt coming from the spin drying unit.

 SALT MILLING

Here the salt is milled in order to considerably reduce its grain size and to produce table salt for household use, salt required for Industrial applications use and for leather tanning.

Salt Drying

This stage is performed by rotating or fluid bed type dryers. Both types of dryers have to reduce the humidity of the salt from 4% to 0.2%.
The machines dry the salt at a temperature of about 200° C. by means of previously heated hot air.

Salt Screening

This stage is carried out by means of Vibrating Screens with an appropriate screening-vibrating capacity, in order to grade different grain size ranges coming from the milling and drying stages.

Salt Screening

Types of salt:

• Coarse dried salt
• Medium dried salt
• Fine dried salt
• Powder

The different types of salt with various grain sizes are stored in separate storage silos to be later bagged or packaged.

Salt Color Sorting

The sodium chloride can be available as rock salt or as sea salt combined with other salts. Therefore, it is possible to obtain salt on an industrial scale basis from either rock salt mines or through solar evaporation of sea water.
In both cases a certain quantity of impurities still remain in the salt, due to the presence of residue of rock or grit from the sea bed.

Salt Color Sorting

Obviously such impurities affect the quality of salt and diminishing its market value.
The colour sorting machines represent an effective solution for the elimination of impurities.
Working on pre-determined size ranges (from 3 to 20 mm.) totally controlled by microprocessors, the colour sorting machines are provided with a continuous self-diagnosis so as to steadily maintain the calibration conditions required, with possibility to store an unlimited number of programs related to the different work typologies.

Salt Sacking

The industrial market requires the use of 50 kg or 25 kg bags.

Salt Sacking

By means of automatic bagging machines that have an output of 800 bags/hour, the salt is packed with the following configuration:


• Coarse salt in 50 kg. bags
• Washed salt in 25 kg. bags
• Whole coarse salt in 25 kg. bags
• Coarse dried salt in 25 kg. bags
• Medium dried salt in 25 kg. bags
• Fine dried salt in 25 kg. bags

Salt Packinging

This is one of the most important stages as the dried salt is removed from storage bins and packaged by means of automatic packaging machines, with an output of 200-300 packets/1’, ready for household use.
The appeal to the market also depends on the type of packaging, aspect of the package, homogeneous grain size, the brightness of the product and the absence of foreign matters.

Salt Bags Palletising

In modern industry efficiency is guaranteed by automatic palletising and strapping lines, with a high degree of standardization and speed in the process.

These lines provide the formation of 1 ton air tight pallets so as safeguard shipment and avoid any economic loss.

Range of ordinary and special applications of treated salt

Tipology
Application
Volume Kg
Packaging
Market Trend
Industrial Salt
Roads in winter
50
Plastic Bags
High Volume
Whole Salt
Table salt
1
Plastic food Bags
Constant demand increase
Food industry, Chemicals tanning
20-50
Plastic Bags
According to industry situation
Fine Dust
Water cleansing, Cattle breed
1500
Big Bags
Constant demand
2 - 3
Tablets
25
Bags
Coarse/Fine Salt
Table salt
1
Food cardboard packs
Constant demand
Coarse/Medium/Fine Salt
Food industry, Chemicals tanning
25
Bags
Constant demand in food industry
1500
Big Bags
Iodate Salt Health Care 1 Bags Select Customers
Saltcellar
Table salt
0,1 Plastic Saltcellar Restaurants Supermarket
Salt Bags Transports Restaurants 0,002 Bags Demand for travellers meals

The data shown is indicative and may vary without notice

 


Via G.M. Dallari, 2 - 41049 Sassuolo (MO) - Italy
Tel. +39-0536-801207 Fax: +39-0536-807248
Email: sales@ms-plants.it