What is the metallurgical complex?
The metallurgical complex is the group of industries that turn ore, and old metal (scrap), into metals. Metals are the base of machines, buildings, cars and wires, so this is a basic industry. Almost every other factory buys its metal.
There are two big parts:
- Ferrous metallurgy (ferrous = with iron): iron, steel and iron alloys. This is the largest part by weight.
- Non-ferrous metallurgy: all other metals, such as aluminium, copper, nickel, zinc, lead and tin, and also gold and silver.
How steel is made: the chain
Steel comes in simple stages. First mining gives iron ore and coking coal. In a blast furnace the ore melts with coke and limestone and gives pig iron. Then pig iron is cleaned into steel. At last rolling mills shape it into sheets, bars and pipes.
A big plant that does all these stages in one place is a full-cycle (integrated) plant. A mini-mill skips the ore. It melts scrap in an electric furnace.
Note: it takes more than one tonne of ore and some coal to make one tonne of iron. The product is lighter than its inputs. That is why the plant goes to the inputs.
Where plants are built: location factors
- Raw-material pull: steel from ore stands near ore, coal, or between them (a famous example is the Ural belt of plants).
- Energy pull: aluminium is made by passing electricity through melted alumina, so plants stand near cheap hydro-power or other power.
- Consumer pull: scrap-based mini-mills stand in big cities where scrap is found and metal is bought.
- Transport and water: rail, ports and river water for cooling help every plant.
Copper and nickel ores hold only a little metal, so the ore is first concentrated near the mine to cut the weight, and then smelted.
Problems, nature and the world picture
Metal plants make dust, gases (such as sulphur dioxide) and slag. Old plants can pollute air, soil and water around them. Cleaner methods are filters, recycling scrap and using less energy per tonne. Recycling saves ore and a large part of the energy.
The world makes more steel than all other metals together. About half comes from one country, China. India, Japan, Russia and the USA are also large producers. Countries with lots of ore, coal and cheap power, or with large cities full of scrap, become metal makers.
Key formulas and definitions
- Ferrous = iron and steel. Non-ferrous = all other metals.
- Integrated plant: ore + coke + limestone → pig iron → steel → rolled products.
- Mini-mill: scrap + electricity → steel.
- Weight-losing industry → plant stands near the heavy input.
- Power-hungry industry (aluminium) → plant stands near cheap electricity.
Worked examples
1. Why does a steel plant that works from ore stand near the ore and coal fields?
Ore and coal are heavy and the steel made is lighter. Carrying the heavy inputs a long way costs more than carrying the steel, so the plant goes to the inputs.
2. Where would you build an aluminium plant: near the bauxite, near the buyers, or near a hydro-power station? Explain.
Near cheap electricity. Making aluminium uses far more electricity than anything else it needs, so the power bill decides the cost.
3. A town has a lot of old cars and machines and a big demand for steel bars. What kind of plant fits it?
A mini-mill. It melts scrap with electricity, so it does not need ore or coal, and it stands near scrap and buyers.
4. A plant carries 4 t of ore over 100 km and 3 t of coal over 300 km each day. Find the total transport cost in t × km. Which part is bigger?
Ore: 4 × 100 = 400. Coal: 3 × 300 = 900. Total = 1300 t·km. The coal haul is the bigger part, so moving closer to the coal would cut the cost most (but only until the ore haul grows).
Common mistakes
- Thinking "ferrous" means "iron-coloured". It means a metal with iron in it.
- Believing every metal plant must stand next to ore. Aluminium goes to power, scrap steel to cities.
- Saying metallurgy makes finished products. It makes metal that other factories turn into goods.
- Forgetting scrap. Recycling is an important source of metal, not waste.