Method for decreasing waste acid content in titanium dioxide production
A technology of titanium dioxide and acid content, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of waste of acid resources, large energy consumption, and high processing costs
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Embodiment 1
[0021] Acid hydrolysis conditions: acid to mineral ratio 1.60, initial reaction acid concentration 84%.
[0022] Grind 1000kg of qualified titanium concentrate, and the 325 mesh sieve residue is less than 30%. Add 620kg of 55% sulfuric acid and mix evenly, then add 1280kg of 98% sulfuric acid to initiate the main reaction. Aging for 30 minutes, adding 3000L water for leaching for 30 minutes, adding iron powder to reduce until the trivalent titanium disappears, and obtaining qualified acid-liberation material titanium solution A, and testing related indicators, 55% of sulfuric acid is prepared from waste acid and concentrated sulfuric acid.
Embodiment 2
[0024] Acid hydrolysis conditions: acid to mineral ratio 1.60, initial reaction acid concentration 84%.
[0025] Grind 1000kg of qualified titanium concentrate, and the residue on 325 mesh sieve is less than 30%, add 1090kg of 55% sulfuric acid and mix evenly, add 660kg of SO 3 , to initiate the main reaction, the initiation temperature is greater than 150°C, the solid phase is matured at 200°C for 30 minutes, added 3000L water for leaching for 30 minutes, added iron powder to reduce until the trivalent titanium disappears, and the qualified acid-release material titanium liquid B is obtained, and the test is related Indicators, 55% of the sulfuric acid is configured from waste acid and concentrated sulfuric acid.
Embodiment 3
[0027] Acid hydrolysis conditions: acid to mineral ratio 1.60, initial reaction acid concentration 75%.
[0028] Grind 1000kg of qualified titanium concentrate, and the residue on 325 mesh sieve is less than 30%, add 1700kg of 55% sulfuric acid and mix evenly, add 370kg of SO 3 , to initiate the main reaction, the initiation temperature is greater than 150°C, the solid phase is matured at 200°C for 30 minutes, added 3000L water for leaching for 30 minutes, added iron powder to reduce until the trivalent titanium disappears, and obtains qualified acid-release material titanium solution C, which is detected Indicators, 55% of the sulfuric acid is configured from waste acid and concentrated sulfuric acid.
[0029] Table 1 is the reaction parameter of each embodiment
[0030] serial number 55% acid consumption (100% discount) Waste acid consumption (percentage) Acid hydrolysis rate stability discharge concentration A 340kg 100kg 96.5% 550ml 132g...
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