The technical achievements highly appreciated at the 37th national sci-tech festival prove effective in different sectors of the national economy.
Korean-style Steelmaking Technique
By allowing simultaneous deoxidation of concentrated ore and decarburization of pig iron in an induction furnace, this technique helps increase steel production at a low cost.
In the past, a large amount of electricity and materials were consumed to produce steel because the pig iron was decarbonized at an electric furnace after the concentrated ore was deoxidized at a blast furnace.
Technicians also developed a new additive to increase the speed of gas generation and life span of refractories and improved the technical and economic indices of steel by using multi-element complex inoculant.
The chemical analysis, mechanical strength measurement and microscopic structure analysis show that this inoculant exerts a good effect on the new steelmaking process.
This technique eliminates the need for oxygen, electrode, rotary kiln and shaft furnace, and reduces refractory and electricity consumption by increasing the melting rate and heat efficiency.
And it makes it possible to produce various kinds of steel and alloy steel without limit.
The developers not only produced quality steel, high-quality steel and pure iron as well as carbon steel for ordinary construction with the new technique, but also high-quality microalloy steel by using no, or less, ferromanganese and ferrochrome.
New Food Manufacturing Technique
The Amnokgang General Foodstuff Factory developed a technique of fermenting starfish by means of lactic acid bacteria and producing foodstuffs good for the growth and development of children.
According to experts, starfish contains a lot of essential amino acids and essential microelements and is widely distributed in the East and West Seas of Korea, but some problems should be solved when using it for foodstuffs.
The technique developed by the factory makes it possible to produce highly nutritious foodstuffs without special production lines.
The factory established a new line for lactic acid fermentation of starfish and produced starfish nutritive cake with lactic-acid fermented starfish and kelp powder.
Now it is pushing ahead with the research to develop a variety of tasty and highly nutritious foodstuffs for children by using starfish.
Jong Hwa Sun
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