Kunming University of Science and Technology

Jianhong Huang

Ping Ning

Senlin Tian

Xuewei Hu

Yingjie Li

Bin Li

Yuxin Song

Qin Zhang

Yunjian Chen

Xiangliang Liu

The present invention discloses a method for ammonium-enhanced flue gas desulfurization (FGD) by using red mud slurry. The method specifically includes: crushing red mud, sieving the crushed red mud, slurrying the red mud, conducting aeration treatment, adding an ammonium salt and/or ammonia, and conducting natural sedimentation to obtain pretreated red mud slurry and pretreated red mud liquor; adding an ammonium salt and/or ammonia to the slurry, adding water and conducting uniform mixing, conducting pre-FGD, conducting deep desulfurization on treated flue gas by using the pretreated red mud liquor, and directly discharging desulfurized flue gas; and charging the pretreated red mud slurry and the pretreated red mud liquor obtained after the treatment to a replacement tank below, adding lime milk to the replacement tank, conducting stirring and natural sedimentation, conducting soilization on subnatant thick red mud slurry, and refluxing the supernatant to a red mud aeration tank.

Method for ammonium-enhanced flue gas desulfurization by using red mud slurry

The present invention discloses a method for aluminum-enhanced dealkalization of red mud and separation and recovery of aluminum and iron. The method includes: dissolving red mud in water, introducing excessive SO, introducing Ofor aeration, and refluxing part of alkaline leachate after filtering; when pH of a red mud mixture decreases to below 3, washing and filtering the red mud mixture, adding NaOH to acidic leachate to adjust its pH to a strongly alkaline level, aging and filtering the leachate, treating filter residue to recover FeO, and refluxing part of alkaline leachate after filtering to the red mud mixture; and adjusting pH of the remaining alkaline leachate after filtering to a weakly acidic level, and conducting filtering to recover aluminum.

Method for aluminum-enhanced dealkalization of red mud and separation and recovery of aluminum and iron

The present invention discloses a method and system for thermal desorption treatment of organic-contaminated soil and treatment of desorbed waste gas. The system includes a thermal incinerator, a desorption flue gas temperature regulating device, a thermal desorption reactor, a dust collector, a heat exchange/steam separator, an absorption reactor, a star-shaped unloader, and a soil cooler. An absorbent containing organic pollutants is used as a fuel, and subjected to thermal incineration to achieve the decomposition and harmless treatment of the organic pollutants; and high temperature flue gas generated by the incineration is used as a heat carrier for thermal desorption remediation of the organic-contaminated soil; and by means of the high solubility capability of fuel oil to organic matter, the fuel oil is used as an absorbent to absorb and purify the organic pollutants in desorbed waste gas, so that the gas is purified gas and up-to-standard discharge is achieved. The present invention achieves the thermal desorption of the organic pollutants, the absorption and purification of the pollutants in the desorbed waste gas, and the thorough decomposition of the organic pollutants; the fuel oil has both functions of the absorbent and the fuel, and the present invention has the advantages of short process, low energy consumption, simple equipment and low cost.

Method and system for thermal desorption treatment of organic-contaminated soil and treatment of desorbed waste gas

The invention discloses a method for simultaneously removing SOand NOin flue gas: uniformly mixing a water-soluble ruthenium salt with ammonia water to obtain an aqueous solution of a ruthenium-amine complex; subjecting the flue gas and the aqueous solution of the ruthenium-amine complex to a countercurrent contact reaction under the temperature of 5-60&#xb0; C., pH of 7.5-12 to obtain a solution A and purified gas; discharging the solution A of the step (2) into a crystallization tank to crystallize and separate an ammonium salt to obtain a solution B, returning the solution B to replace the aqueous solution of the ruthenium-amine complex. The invention utilizes the ruthenium-amine complex having a strong capability of complexing with NO as well as residual oxygen in the flue gas to carry out liquid phase catalytic oxidation to convert the NOinto ammonium nitrate, and the removal efficiency of the NOand the SOis high.

Method for simultaneously removing SOand NOin flue gas

The invention is a device and method for purifying sulfur dioxide and nitrogen oxide in flue gas with an electrolysis-chemical advanced oxidation enhanced ammonia method. The device includes a thermal activation reactor, ammonium hydroxide storage tank, absorption tower, electrolytic bath and crystallization separator. The method takes raw material part of an ammonium sulfate solution that is a reaction product of ammonia and sulfur oxide in flue gas, and an ammonium persulfate solution prepared by electrolysis of an electrolytic bath as an oxidant to enhance the efficiency of purifying sulfur dioxide and nitrogen oxide in the flue gas with an ammonia method. A thermal activation reactor activates an ammonium persulfate containing solution to generate a strong oxidizing SO4., so that NOand SOin the flue gas may be more efficiently converted into a product having higher solubleness for enhanced removal of sulfur dioxide and nitrogen oxide in the flue gas.

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Kunming, China

Jianhong Huang