Heavy metal ion flocculating agent and preparation method thereof
A technology of heavy metal ions and flocculants, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc. The effect needs to be further improved to achieve the effect of setting reasonable operation steps, realizing resource recycling and improving the economic benefits of the enterprise
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[0015] A preparation method of a heavy metal ion flocculant, comprising:
[0016] S1. Mix and react the phosphorus-containing solution obtained from the reaction of inorganic acid and phosphating slag with pickling waste liquid containing ferrous ions and hydrogen ions to completely obtain a mixed solution. The phosphating slag mentioned in this application refers to iron phosphate as the main component, which is the precipitate produced in the phosphating process in the metal processing process. The mass percent content of iron in the phosphating slag used in each embodiment of the present application is about 30%.
[0017] Specifically, the content of iron in the phosphating slag is determined first. Then take a certain amount of hydrochloric acid or sulfuric acid and add it to the container. Add phosphating slag under the premise of stirring to control the feeding time at about 10-30 minutes. After the addition is completed, continue to stir until the phosphating slag is c...
Embodiment 1
[0035] This example provides a heavy metal ion flocculant and its preparation method.
[0036] A preparation method of a heavy metal ion flocculant, comprising:
[0037] Take 600g of pickling waste acid from A steel wire rope company, which contains Fe 2+ : 9.1×10 4 mg / L, containing HCl: 3.1%; take 100g of phosphating slag, which contains Fe after testing 3+ : 29.3wt%; 100g phosphating slag is added in the 100ml hydrochloric acid (20%) solution under agitation, control feeding time about 30 minutes; Continue to stir until phosphating slag is all dissolved after adding, and stirring time is about 1 hour; The solution was filtered to remove insoluble impurities to obtain a phosphorus-containing solution for later use (filtered impurities: 3.1 g). Slowly add the above 600g pickling waste acid into the above phosphorus-containing solution under stirring condition, control the feeding time for about 40 minutes, continue stirring for about 30 minutes after the addition, add 0.5g ...
Embodiment 2
[0039] This example provides a heavy metal ion flocculant and its preparation method.
[0040] A preparation method of a heavy metal ion flocculant, comprising:
[0041] Take 1200g of pickling waste acid from B steel pipe enterprise, which contains Fe 2+ : 1.13×10 5 mg / L, containing H 2 SO 4 : 4.1%; take 240g of phosphating slag, which contains Fe after testing 3+ : 28.6%; 240g phosphating slag was added in the 200ml hydrochloric acid (20%) solution under stirring condition, and the feeding time was controlled at about 40 minutes; after the addition was finished, continue to stir until the phosphating slag was all dissolved, and the stirring time was about 1 hour; The solution was filtered to remove insoluble impurities to obtain a phosphorus-containing solution for later use (filtered impurities: 7.1 g). Slowly add the above 1200g pickling waste acid into the above phosphorus-containing solution under stirring condition, control the feeding time for about 40 minutes, con...
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