Method for treating waste liquid containing magnesium
A treatment method and technology of waste liquid, applied in the field of metallurgy, can solve the problems of difficult treatment and high moisture content, and achieve the effect of simple process, low cost and easy control
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[0032] Example 1
[0033] Take 1L of the magnesium-containing waste liquid, and precipitate the magnesium ions in it by magnesium precipitation by ammonia method, and finally obtain a magnesium precipitation solution with a magnesium content of 10g / L. Add ammonium dihydrogen phosphate to the solution after magnesium precipitation, and react for 30 minutes at a temperature of 35°C and pH=9.1. The magnesium ammonium phosphate precipitate is filtered out, washed with water and dried at 50°C. Analysis by conventional methods shows that the magnesium content in the filtrate obtained after the magnesium ammonium phosphate is filtered out is 10 mg / L, the magnesium precipitation rate is greater than 99%; the purity of the magnesium ammonium phosphate is greater than 99%.
[0034] Lime is added to the filtrate for causticization to obtain gypsum and post-causticization liquid. The causticized liquid is subjected to ammonia distillation operation, and the obtained ammonia water is returned ...
Example
[0035] Example 2
[0036] Take 1L of the magnesium-containing waste liquid, and use ammonium carbonate to precipitate magnesium ions in it to precipitate the magnesium ions, and finally obtain a magnesium-precipitated solution with a magnesium content of 4g / L. Add ammonium dihydrogen phosphate to the post-magnesium precipitation solution, and react for 30 minutes at a temperature of 35°C and pH=8.5. The magnesium ammonium phosphate precipitate is filtered out, washed with water and dried at 50°C. Analysis by conventional methods showed that the magnesium content in the filtrate obtained after the magnesium ammonium phosphate was filtered out was 15 mg / L, and the magnesium precipitation rate was greater than 99%. The purity of magnesium ammonium phosphate is greater than 99%.
[0037] Lime is added to the filtrate for causticization to obtain gypsum and post-causticization liquid. The ammonia in the causticized liquor is converted into ammonium salt and returned for magnesium prec...
Example
[0038] Example 3
[0039] Take 1L of the magnesium-containing waste liquid and use ammonium bicarbonate to precipitate magnesium to precipitate the magnesium ions, and finally obtain a magnesium-precipitated solution with a magnesium content of 10g / L. Add ammonium dihydrogen phosphate to the post-magnesium precipitation solution, and react for 60 minutes at a temperature of 45° C. and pH=8.2. The magnesium ammonium phosphate precipitate is filtered out, washed with water and dried at 80° C. Analysis by conventional methods showed that the magnesium content in the filtrate obtained after the magnesium ammonium phosphate was filtered out was 15 mg / L, and the magnesium precipitation rate was greater than 99%. The purity of magnesium ammonium phosphate is greater than 99%.
[0040] It is obtained by adding lime to the above filtrate for causticizing. The ammonia in the causticized liquor is converted into ammonium salt and returned for magnesium precipitation.
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