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Sorghum & Millet Processing Plants
Cereals, Tubers & Sugar Processing

Sorghum & Millet Processing Plants

A sorghum and millet processing plant cleans and dehulls small hard grain, then mills it into flour or grits, and can add malting or starch steps where the product calls for them.

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Sorghum & Millet Processing Plants

The first decision is the product: decorticated flour, whole-meal flour, grits, brewing malt and starch each need a different arrangement after cleaning. The grain then decides the rest. Sorghum with a coloured seed coat is much harder to mill to a white flour than white sorghum, and pearl millet is small, irregular and rich in fat, which affects both decortication and shelf life. A buyer should settle which grains and colours will be bought across the season, the flour colour and fineness customers expect, and who will take the bran. Fine grain dust is a fire risk, so dust collection and dry storage belong in the plant definition from the start.

Sorghum and millet carry a tough outer coat, so the route starts with cleaning and destoning and usually with removal of the outer layers before any flour is made. Three machine types do this: abrasive decorticators that wear the pericarp away from the outside, machines that rub it off, and roller mills that cut the endosperm out from inside the coat. Abrasive decortication suits hard, white, round grain of fairly even size. Coloured or irregular grain gives a greyer flour and a lower recovery, so the economics should be set from trial runs on your own grain. The roller route conditions the grain with water first, so the coat comes away in large pieces instead of shattering, and it can give white flour even from coloured varieties, at the price of tempering bins and a longer line. Decorticated grain is then ground in hammer, stone or roller mills and sieved to flour or grits. A malting route adds steeping, germination and kilning. A starch route adds wet milling, separation, dewatering and drying, which is why starch is a separate option from flour milling. Moisture control at intake and in store matters throughout, because storage fungi grow on damp grain.

Indicative Capacity Range

  • 1–20 tonnes grain/day

Key Specification Inputs

Grain cleaning, milling, starch/food end-use and dust.

Technical Specifications

TechnologyDry milling of cleaned, decorticated grain, with optional malting or wet starch separation
Working PrincipleThe outer coat is removed by abrasion, rubbing or roller milling, then the endosperm is ground and sieved to flour or grits
Decortication OptionsAbrasive decorticator for hard white round grain; tempering bins and roller milling for coloured or irregular grain
Milling OptionsHammer, stone or roller mill with sieving, chosen by flour colour, fineness and whether the germ is kept
Product RouteFlour, grits, malt or starch; the steps after cleaning differ for each
Feed GrainType, colour, moisture and cleanliness at intake decide the cleaning and decortication stages
DryingFlash or hot-air dryer for starch and malt routes only, with the heat source set by local fuel cost
Dust ControlAspiration at transfer points and a dust collector, with explosion venting suited to fine grain dust
AutomationManual or PLC-controlled lines, with weighing and batching where flour is blended
UtilitiesElectric power for mills and fans; water and heat only on malting and starch routes; compressed air for the pack line
Final OutputPacked flour or grits, malt or starch, with bran and husk as separate streams

Typical Process Route

1

Receiving and cleaning

Grain is weighed, sampled for moisture and passed over sieves, aspirators and a destoner to remove stones, dust, chaff and foreign seed. Damp grain taken into store is where mould and aflatoxin trouble starts, so intake moisture is checked first.

2

Conditioning and decortication

The outer coat is removed by abrasion, rubbing or, after tempering with water, by roller milling. Millets need less water and time than sorghum. What goes wrong is a coloured coat left on the grain, which turns the flour pink or grey.

3

Size reduction

Decorticated grain is broken down in a hammer, stone or roller mill to meal or grits. Mill choice sets how much germ stays in the flour and how coarse the first product is.

4

Separation or cooking as the product requires

Malting steeps and germinates the grain before kilning. A starch route separates starch from fibre and protein in water. Pre-cooked flour is cooked, then flaked or dried. A plain flour plant skips this step.

5

Dewatering and drying

Wet routes only. Starch cake or malt is dewatered and dried in a hot-air or flash dryer, with the heat source set by local fuel cost. Over-drying starch or scorching malt spoils the product.

6

Milling and sieving

Meal is ground to the final fineness and sieved into flour, semolina-type grits and returns. Aspiration at every transfer point keeps dust out of the building.

7

Packing and storage

Flour and grits are weighed into bags. Pearl millet flour turns rancid faster than other flours because of its fat, so pack sealed and keep stocks short.

Process & Equipment Modules

  • Intake hopper and weighing scale
  • Pre-cleaner with aspirator and destoner
  • Grain tempering bins for the roller route
  • Abrasive decorticator or dehuller
  • Hammer, stone or roller mill
  • Plansifter or sieve bank
  • Aspiration and dust collection system
  • Steeping tanks, germination bed and kiln for the malting route
  • Starch separation and dewatering set for the starch route
  • Hot-air or flash dryer and cooler
  • Weighing and bagging line
  • Control panel

Plant Output

Sorghum or millet flourGrits and semolina-type fractionsMalt or starch, on those routesBran and husk for feed or fuel

Applications

  • Decorticated sorghum flour for porridge, flatbreads and other staple dishes
  • Pearl millet and finger millet flour and grits for porridge and local staples
  • Malted sorghum or millet for brewing and for malted porridge bases
  • Sorghum or millet starch for food and industrial use
  • Composite flour blends with wheat or cassava flour for bakery use
  • Bran and husk as animal feed or fuel

Key Features

  • Decortication Matched to the Grain

    Abrasive decorticators suit hard, white, round grain. Coloured, soft or irregular grain, including much pearl millet, needs a different machine or a roller route, so test your own grain before choosing.

  • Roller Route With Conditioning

    Tempering bins let existing wheat-style roller mills handle sorghum and millet, and can give white flour from coloured varieties that abrasion handles poorly.

  • Plan the Germ and Shelf Life

    Keeping the germ in the flour improves nutrition but speeds rancidity. Removing it, milling to order and storing whole grain are the usual answers, and the plant should be set up for the choice.

  • Dust Control Throughout

    Aspiration, a dust collector, explosion venting suited to fine grain dust and clean-down access are part of the design, not accessories.

  • Bran and Husk Stream

    Decortication makes a separate bran and husk stream that needs bagging, storage and a buyer. Counting only the flour output misstates the mass balance.

Country Pages for Sorghum & Millet Processing Plants

This product is listed on the pages of the countries below, each with its own enquiry route. Where Kadali has no office in a country, enquiries are handled from the Accra office.

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Frequently Asked Questions

What information is needed to size Sorghum & Millet Processing Plants?
Which grains (white or coloured sorghum, pearl or finger millet), tonnes of grain per day and operating hours, the products and grades you will sell, and the grain moisture and cleanliness at intake. Add the flour colour and fineness customers expect, whether the bran must come off completely, and how the grain supply varies across the season. The decorticator and mill type cannot be chosen without the grain and the product.
What capacity range does Sorghum & Millet Processing Plants cover?
The indicative capacity range is 1–20 tonnes grain/day. It is stated on a grain basis per day, so restate your own volume on that basis and say how many hours a day the plant will run.
Can brown sorghum be used for flour?
Seldom. Brown sorghums have a pigmented testa that is among the last layers removed in abrasive decortication, and once the grain is wetted the testa stays stuck to the endosperm. Its tannin tastes bitter and colours the flour, so these grains mostly go to brewing. A roller route with conditioning cuts the endosperm free from inside the coat and can give a white, low-tannin flour, but it needs a longer line.
Why is pearl millet harder to decorticate than other grains?
Many pearl millet grains have an irregular dent in the coat, and non-round seeds wear away faster at some points than others in an abrasive decorticator, so layers come off unevenly. Abrasive machines work best on hard, white, round grain of even size. Test pearl millet on your intended machine and set the economics from the recovery you measure, not from a catalogue figure.
Should I choose an abrasive decorticator or a roller mill?
Abrasive decortication is simpler and cheaper and suits clean white grain. Roller milling after tempering handles coloured or mixed grain and gives whiter flour, but adds tempering bins, sieving stages and more power. If maize is also milled, a maize starch and flour line shares much of the cleaning and roller-milling equipment.
What happens to the bran removed from sorghum and millet?
Decortication separates a bran fraction rich in pericarp, with some germ and endosperm, from the endosperm fraction kept for flour. Bran is usually fed to livestock, so plan bagging, dry storage and a buyer before commissioning. The bran share also lowers the tonnes of flour per tonne of grain, which matters when pricing the output.
Why does millet flour go rancid, and what does that mean for the plant?
Pearl millet has the highest fat content among the millets, and fat in the germ oxidises once the grain is milled. Flour is usually made as it is needed, and the grain is better stored whole. A plant for this grain should be sized for mill-to-order running, with grain storage, sealed packing and short flour stocks.
How do I request a proposal for Sorghum & Millet Processing Plants?
Use the Request a Quote page and describe your project. Define the products (flour, grits, malt or starch), the grain supply and the grades you will sell, and ask the proposal for the mass balance and power use.

Enquire about Sorghum & Millet Processing Plants

Send your raw material, target product and capacity to Kadali Africa Ventures for a technical proposal.

Request a QuoteWhatsApp