Use of silicon-containing polymers to improve red mud flocculation in the bayer process
A technology of silicon polymers and polymers, applied in aluminum compounds, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc.
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[0054] test steps
[0055] Artificial Bayer's liquid can be prepared by adding 256g sodium aluminate, 66g sodium hydroxide and 40g sodium carbonate to water to obtain a total of 1000ml solution and heating to 100°C.
[0056] DSP can be prepared by heating kaolin to 150°C in sodium hydroxide solution, followed by filtering, washing and drying to recover dry DSP. Red mud solids can be obtained from mud that is normally discarded as waste in operations. The slurry is washed from the accompanying dilute sodium aluminum aluminate solution, dried and ground.
[0057] For the settling test, DSP alone or a mixture of DSP and red mud solids is dispersed in the above liquid, usually resulting in a slurry containing about 40 g / l suspended solids. The dilute reagent is mixed into the slurry contained in the graduated cylinder through the porous piston and the time to settle to a fixed distance is measured so that the settling rate of the flocculated solids can be calculated. Meanwhile,...
Embodiment 5d
[0093] Example 5d - Reagent H
[0094] The reagent can be prepared in a similar manner to Example 5a, except that 0.005 mol (1.49 g) of glycidyl cetyl ether is substituted for butylene oxide. The product is reagent H.
[0095] Example 5e - Reagent I
[0096] The reagent can be prepared in a similar manner to Example 5a, except that 0.005 mole (075 g) of glycidyl phenyl ether is substituted for butylene oxide. This product is reagent I.
[0097] The effectiveness of reagents E to I without the addition of flocculants was tested in a 40 / 60 DSP / mud mixture and demonstrated a satisfactory settling rate and clarity at a dosage of 200 ppm as demonstrated by the data shown in Table 5.
[0098] table 5.
[0099]
[0100] The data shown in Table 6 demonstrate that Reagent E and Reagent I increased the settling rate and clarity in the 40 / 60 DSP / red mud mixture when used in conjunction with Superfloc HX-400.
[0101] Table 6.
[0102]
[0103] a Superfloc HX-400 floccula...
Embodiment 8
[0109] Example 8 - Reagents L and M
[0110] 10.0 g of Gantrez AN 169 (methyl vinyl ether-maleic anhydride copolymer manufactured by International Specialty Products Inc, Wayne, NJ, USA) was dissolved in 150 ml of acetone. 1.42 g of aminopropyltriethoxysilane in 50 ml of acetone were added. The mixture is gelled. Dilute 108 g of 50% NaOH with 250 ml of water and heat to 80°C. The gum was added to the NaOH solution, and the acetone was boiled off, leaving an aqueous solution containing 70% polymer, called Reagent L. A similar product was prepared substituting dioxane for acetone. This polymer is called Reagent M.
[0111] As demonstrated by the data shown in Table 7, both Reagents L and M showed a significant increase in the sedimentation rate of suspended DSP compared to the Gantrez control. Reagent M significantly increased settling when used in combination with Superfloc HX-400 in a 40 / 60 DSP / red mud blend or Superfloc 1227 in a 30 / 70 DSP / red mud blend.
[0112] Tabl...
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