The present invention is a block comprising 75 to 95 wt% basalt stone dust sludge, 3 to 10 wt% gelatinized starch, and 8 to 15 wt% water, and a block cured by compression molding after mixing these components, and the compressive strength of the basalt stone dust sludge block is 7 We propose a basalt stone dust sludge block for rock wool characterized by more than MPa. Basalt fiber can be obtained by putting a block of basalt stone dust sludge into a melting furnace and spinning it. According to the present invention, it is possible to manufacture high-quality basalt fiber that can be used as an insulation material by utilizing basalt stone dust sludge, which is an industrial waste, and provides a new material while reducing environmental pollution, greatly improving the industrial value of waste resources.
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