Method for preparing mineral processing agent by using stirring mill and base coupling
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A beneficiation agent and stirring mill technology, which is applied to chemical instruments and methods, flotation, special treatment targets, etc., can solve the problems of high operating costs, achieve the effects of increasing wall breaking effect, low production cost, and realizing reduction
Inactive Publication Date: 2019-07-12
CENT SOUTH UNIV
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Problems solved by technology
At present, the sludge cracking technology mainly includes: mechanical method (rotary ball milling method, high-pressure homogenizer method, mechanical jet crushing technology, high-efficiency pulse technology and centrifugal lysis technology, etc.), ul
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Embodiment 1
[0027] The process of the present invention is used to treat the remaining sludge of a municipal sewage treatment plant with a water content of 99.3% and a COD of 12460 mg / L.
[0028] 1) Using sodium hydroxide to adjust the pH of the sludge to 11, using steel balls as the grinding medium, the mass ratio of the steel balls to the sludge is 1:2, and grinding at 4000rpm for 80min to obtain cracked sludge;
[0029] 2) Centrifuge the cracked sludge for 30 minutes at 4000 rpm, and vacuum filter the centrifuged sludge with a 0.045um filter membrane, and obtain the sludge supernatant after filtration;
[0030] 3) Using sodium hydroxide to adjust the pH of the supernatant to 11, the sludge supernatant is concentrated to 20% of the original volume at 60°C to obtain the modified sludge supernatant.
[0031] The modified supernatant prepared in Example 1 was used for the flotation of hematite, the original ore iron grade was 48.87%, the pH was adjusted to 8, and the modified supernatant was used a...
Embodiment 2
[0035] The process of the present invention is used to treat the remaining sludge of a municipal sewage treatment plant with a water content of 97.6% and a COD of 11384 mg / L.
[0036] 1) Use potassium hydroxide to adjust the pH of the sludge to 13, using quartz sand as the grinding medium, the mass ratio of steel balls to sludge is 1:3, and grinding at 5000rpm for 50min to obtain cracked sludge;
[0037] 2) Centrifuge the cracked sludge at 6000 rpm for 30 minutes, and vacuum filter the centrifuged sludge with a 0.045um filter membrane to obtain the sludge supernatant;
[0038] 3) Use potassium hydroxide to adjust the pH of the supernatant to 13, and concentrate the sludge supernatant to 10% of the original volume at 80°C to obtain the modified sludge supernatant.
[0039] The modified supernatant prepared in Example 2 was used for the flotation separation of talc and molybdenite. Under the condition of pH=8, with the modified supernatant as an inhibitor, the separation efficiency of mo...
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Abstract
The invention discloses a method for preparing a mineral processing agent by using a stirring mill and base coupling, and belongs to the field of resource utilization of municipal sludge. The stirringmill and alkali coupling are adopted to crush residual sludge, centrifugal filtration is performed on the crushed sludge, and causticizing and concentrating are performed so as to obtain a product which is adopted as a flotation agent; a rotary ball milling method is adopted to break walls, on the one hand, a huge fluid shearing force, instantaneous high pressure and an instantaneous impact forcegenerated during operation of a mechanical device are utilized to break the cell walls of every individual bacterium and zoogloea in the residual sludge so as to force organic matter in the cells toflow out and obtain a high wall-breaking rate of the sludge; on the other hand, the technology has low production cost and stable operation, so that the industrial production of the technology is facilitated; through addition of a part of base during the ball milling, on the one hand, the wall-breaking effect of the sludge is increased further through the ball-milling function so that the averagewall-breaking rate of the sludge in the technology can reach 80% or above, on the other hand, the addition amount of base in the subsequent causticizing process can be reduced, so that the operation cost is reduced.
Description
Technical field [0001] The invention belongs to the field of municipal sludge resource utilization, and specifically relates to a method for preparing a beneficiation agent by coupling a stirring mill and an alkali. Background technique [0002] At present, the main sewage treatment methods at home and abroad are: activated sludge method, biofilm method, oxidation method, biological activated carbon technology, etc. The activated sludge method accounts for the total sewage treatment volume due to its high processing capacity and good effluent quality. More than 90. However, the activated sludge method produces a large amount of excess sludge due to the proliferation of microorganisms. This sludge poses a great threat to the environment and at the same time has become a heavy burden on the sewage treatment plant. The sludge of the sewage treatment plant has a high water content (95% to 99%), and its dehydration and treatment costs are also high. The cost of sludge treatment has ...
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Application Information
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