Hydrophobic surface modification method for improving flotation effect of oxidized coal slime
A surface modification and coal slime flotation technology is applied in the field of improving the surface hydrophobicity of oxidized coal slime and surface modification of oxidized coal slime.
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Embodiment 1
[0027] To implement a hydrophobic surface modification method for improving the flotation effect of oxidized slime provided by the present invention, the hydrophobic surface modification method is carried out according to the following steps:
[0028] The first step is to weigh out 0.10 g of calcium hydroxide, weigh out 500 ml of deionized water, and place it in a beaker for stirring for 0.2 hours to dissolve the calcium hydroxide in the water to form an alkaline calcium hydroxide solution.
[0029] In the second step, 100g of oxidized coal slime with particle size less than 0.5mm, ash content of 20.1wt%, moisture content of 6.1wt%, volatile content of 8.4wt%, and fixed carbon of 65.4wt% were added to the calcium hydroxide solution prepared in the first step, and stirred for 0.5 h Perform acid-base neutralization reaction at room temperature to neutralize acidic functional groups (carboxyl groups, phenolic hydroxyl groups) on the surface of oxidized coal slime particles. Afterwards...
Embodiment 2
[0036] To implement a hydrophobic surface modification method for improving the flotation effect of oxidized slime provided by the present invention, the hydrophobic surface modification method is carried out according to the following steps:
[0037] The first step is to weigh 0.50 g of calcium hydroxide, measure 500 ml of deionized water, place it in a beaker and stir for 3 hours to dissolve the calcium hydroxide in the water to form an alkaline calcium hydroxide solution.
[0038] In the second step, 100g of oxidized coal slime with particle size less than 0.5mm, ash content of 26.2wt%, moisture content of 6.9wt%, volatile content of 23.1wt%, and fixed carbon of 43.8wt% were added to the calcium hydroxide solution prepared in the first step, and stirred for 2h A room temperature acid-base neutralization reaction is carried out to neutralize the acidic functional groups (carboxyl groups, phenolic hydroxyl groups) on the surface of oxidized coal slime particles. Afterwards, the fo...
Embodiment 3
[0045] To implement a hydrophobic surface modification method for improving the flotation effect of oxidized slime provided by the present invention, the hydrophobic surface modification method is carried out according to the following steps:
[0046] The first step: Weigh 0.33 g of calcium hydroxide, measure 500 ml of deionized water, place it in a beaker and stir for 1 hour to dissolve the calcium hydroxide in the water to form an alkaline calcium hydroxide solution.
[0047] Step 2: Add 100g of oxidized coal slime with particle size less than 0.5mm, 24.7wt% ash, 8.2wt% moisture, 17.1wt% volatile content, and 50.0wt% fixed carbon to the calcium hydroxide solution prepared in the first step, and stir for 2h A room temperature acid-base neutralization reaction is carried out to neutralize the acidic functional groups (carboxyl groups, phenolic hydroxyl groups) on the surface of oxidized coal slime particles. Afterwards, the formed coal slurry is suction filtered by a suction filter...
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