Many units across the country widely introduce the methods of producing cement by relying on locally abundant raw materials.
“Non-burned cement production is the main trend of development of the cement industry in the 21st century,” said an official of the Ministry of Construction and Building-materials Industry.
Unlike the production method of Portland cement, the non-burned method, in general, is very low in the dependence on limestone and coal.
Most important in cement production is the stage of making cement clinker, which forms the main component mineral of cement, from raw materials. In order to get clinker, it is inevitable to calcinate and melt raw materials in the revolving furnace, which is done only at special factories.
“However, calcination is needless as the ash from blast furnace, slag from electric furnace, brown coal ash, pumice and serpentinite, which are used as the main materials for the non-burned cement, contain a certain amount of major component minerals of cement. Adding some components that differ a little is enough,” said a researcher of the State Academy of Sciences.
Sukchon County in South Phyongan Province is leading others in producing non-burned cement.
It developed a method of using brown coal as the main material for the non-burned cement production.
“Our county could not produce cement as it has no limestone and coal deposits. But we have put an end to it,” said an official of the county people’s committee.
The county set up a non-burned cement production process with 60 percent of brown coal ash and 7 percent of marine solonchak, and produces an additive that can be claimed to be the core of the cement production.
Equipped with one ton-capacity ball crusher and 50 kWh capacity dynamotor powered by anthracite gas, the not-so-big production base annually turns out a large quantity of cement.
According to lead developer Ri Myong Song, when the ball crush is run by putting in raw materials and additive, it makes cement in two hours. The cement is waterproof and resistant to freezing and keeps warmth. As its hardness is about 180 MPa, it can be used not only in the production of blocks but also in the plastering of walls and floor construction of one-storey buildings.
“We have built several buildings with the cement. Now we pave roads with it,” said a county official.
The environment-friendly technology was highly appreciated at different sci-tech exhibitions.
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