Method for making sintering bed charge by returning mine at high mixture ratio
A bottom material and ore-returning technology, which is applied in the field of ironmaking raw materials, can solve the problems of sinter reduction, energy consumption, and sinter utilization rate reduction, and achieve the effects of increasing sintering productivity, reducing production costs, and reducing fuel consumption
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[0018] Example 1
[0019] The various raw materials are mixed according to the following mass percentage ratios: 50% sintering return, 35% fine iron scale, 5% iron sludge, 10% bentonite and starch. The returned ore, iron-containing sludge, fine-grained iron scale, bentonite and starch (55% bentonite and 45% starch by weight) are mixed and mixed. Then put the mixture into a roller ball press for briquetting, the briquetting specification is 15mm×15mm×30mm, and finally drying and roasting. The tested grades of the obtained briquettes are 56% TFe, 6.70% FeO, and low-temperature reduction powdering rate (less than 0.5 mm) of 5.44% after the briquettes are dried.
Example Embodiment
[0020] Example 2
[0021] The various raw materials are mixed according to the following mass percentage ratios: 60% sintering return ore, 20% fine-grained iron scale and iron sheet, 15% iron sludge, 5% bentonite and starch. The returned ore, iron-containing sludge, fine-grained iron scales and iron sheets, bentonite and starch (40% bentonite and 60% starch by weight) are stirred and mixed. Then put the mixture into a roller ball press for briquetting, the briquetting specification is 15mm×15mm×30mm, and finally drying and roasting. The tested grades of the obtained briquettes are 55.2% TFe, FeO 7.90%, and the low-temperature reduction pulverization rate (less than 0.5 mm) of the briquettes after drying is 8.56%.
Example Embodiment
[0022] Example 3
[0023] The various raw materials are mixed according to the following mass percentage ratios: 75% sintering return ore, 15% fine-grained iron scale, iron sheet and high-grade concentrate powder, 5% iron sludge, 5% bentonite and starch. The returned ore, iron-containing sludge, fine-grained iron scale, iron sheet and high-grade concentrate powder, bentonite and starch (25% bentonite and 75% starch by weight) are stirred and mixed. Then put the mixture into a roller ball press for briquetting, the briquetting specification is 15mm×15mm×30mm, and finally drying and roasting. The obtained briquette has a TFe of 54% and a FeO of 9.60% after testing. The low-temperature reduction pulverization rate (less than 0.5 mm) of the briquette after drying is 9.34%.
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