Method and process for recovering chromium from chromium residue by chlorination segregation method
A technology of chromium slag and disposal method, applied in the direction of chromium halide, climate sustainability, sustainable waste treatment, etc., can solve problems such as secondary pollution, achieve the advantages of less equipment investment, good promotion and application prospects, and solving secondary pollution. Effect
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[0024] Example 1
[0025] After grinding 500g of chromium slag and 20g of coal to 80 meshes, mix them thoroughly, add 20mL of calcium chloride and 10mL of 3% polyvinyl alcohol aqueous solution and mix them evenly, and then granulate into granules with a diameter of 4mm and a length of 10mm. Transfer to the tubular roasting furnace, after roasting at 980 ° C for 50 minutes, the gas out of the roasting furnace is absorbed by water to obtain 500 mL of chromium trichloride aqueous solution; obtain 493.1 g of slag. content is less than 1ppm).
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[0026] Example 2
[0027] After grinding 500g of chromium slag and 20g of coal to 80 meshes, mix them thoroughly, add 20mL of calcium chloride and 10mL of 3% polyvinyl alcohol aqueous solution and mix them evenly, and then granulate into granules with a diameter of 4mm and a length of 10mm. Transfer to the tubular roasting furnace, after roasting at 980 ° C for 80 minutes, the gas from the roasting furnace is absorbed by water to obtain 500 mL of chromium trichloride aqueous solution; obtain 492.5 g of slag material. content is less than 1ppm).
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[0028] Example 3
[0029] After grinding 500g of chromium slag and 20g of coal to 80 meshes, mix them thoroughly, add 20mL of calcium chloride and 10mL of 3% polyvinyl alcohol aqueous solution and mix them evenly, and then granulate into granules with a diameter of 4mm and a length of 10mm. Transferred to the tubular roasting furnace, after roasting at 980 ° C for 90 minutes, the gas from the roasting furnace was absorbed by water to obtain 500 mL of chromium trichloride aqueous solution; 492.4 g of slag was obtained. Chromium content below 1 ppm).
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