Use method for converter smelting stainless steel waste-chromium sludge
A converter smelting, stainless steel technology, applied in the direction of manufacturing converters, improving process efficiency, etc., can solve problems such as low utilization efficiency of chrome sludge
Active Publication Date: 2017-05-31
SHANXI TAIGANG STAINLESS STEEL CO LTD
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AI Technical Summary
Problems solved by technology
[0003] The technical problem to be solved by the present invention is: how to solve the problem of low utilization efficiency in the recycling process of chrome sludge
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0011] 1. Ingredients and mixing
[0012] The converter chrome slime and binder are batched and mixed according to the following parts by weight:
[0013] Chrome mud: 100 parts, sodium silicate: 2 parts, 20 parts of polyvinyl alcohol aqueous solution with a mass percentage of 0.5%.
[0014] 2. Pressure balls to form blocks
[0015] The above-mentioned uniformly stirred mixture is transported by the belt and then put into the roller briquetting machine, and the chrome slime briquetting process is completed by the rotation, extrusion and demoulding of the roller briquettes. The chrome mud is processed into an oval pressure ball with a size of φ30mm×40mm×50mm.
[0016] 3. Baking
[0017] Grill the above chrome mud press balls through a 400°C±50°C barbecue oven for 15 minutes to dry the moisture in the chrome mud press balls and increase the strength of the chrome mud press balls. Use a full-automatic pressure testing machine (model: YAW-300C) to conduct a strength test. The s...
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Abstract
The invention relates to the technical field of recycling of stainless steel wastes. A use method for the converter smelting stainless steel waste-chromium sludge comprises the following steps: 1, adding 2 percent of sodium silicate by mass and 8 to 13 percent of a polyvinyl alcohol aqueous solution by mass with the mass concentration of 0.5 percent into the converter smelting stainless steel waste-chromium sludge, and uniformly mixing the materials and the sludge to form a mixture; 2, pressing the mixture prepared in the step 1 into elliptical chromium sludge pressure balls with the particle size of 30 to 50 mm; 3, drying the chromium sludge pressure balls at the temperature of 400 + / - 50 DEG C to enable the strength of the chromium sludge pressure balls to be 900 to 1,500 N and the moisture content to be less than 2 percent by mass; and 4, before converter charging, pre-adding the chromium sludge pressure balls prepared in the step 3 into a converter, and when a coolant needs to be added into the converter, adding the chromium sludge pressure balls which are prepared in the step 3 and serve as coolants into the converter.
Description
technical field [0001] The invention relates to the technical field of stainless steel waste recycling. Background technique [0002] The current smelting of chromium-based stainless steel basically adopts the converter-VOD furnace-LF furnace-continuous casting production process. The converter in the process undertakes the main smelting tasks such as decarburization, desulfurization, alloying and composition adjustment of molten iron. A large amount of waste is generated during the converter smelting process. — Chrome slime. The traditional chrome slime utilization process is to return the chrome slime to the submerged arc furnace and use it in the ferrochrome smelting process. Since the chromium content in chromium mud is 6%-10%, and the iron content is 50%-60%, there are low chromium-iron ratio (the chromium-iron ratio is only 0.2) and fine material particle size ( The drying particle size of chrome sludge is less than 0.5mm) and other problems such as difficulty in uti...
Claims
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IPC IPC(8): C21C5/28C22B1/248
CPCC21C5/28C22B1/2406C22B1/248Y02P10/20
Inventor 赵海泉李一力史永林仪桂兰
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD