50results about How to "Reduce desulfurization efficiency" patented technology

The invention relates to an ammonia process flue gas treatment method for acidic tail gas. The method includes the steps of: 1) controlling the sulfur dioxide concentration of tail gas entering an absorption tower at a level of less than or equal to 30000mg / Nm<3>; 2) arranging process water in an absorption tower entrance flue or in the absorption tower or cooperating with a ammonium sulphate solution to perform spray cooling; 3) disposing an oxidation section in the absorption tower, setting an oxidation distributor at the oxidation section to achieve oxidation of a desulfurized absorption liquid; 4) arranging an absorption section in the absorption tower, utilizing an absorption liquid distributor in the absorption section to realize desulfurization spray absorption by an ammonia-containing absorption liquid, which is fed through an ammonia storage groove; 5) arranging a water washing layer at an absorption section upper part in the absorption tower, washing the absorption liquid in the tail gas by the water washing layer and reducing the absorption liquid escape; and 6) setting a demister at the upper part of the water washing layer in the absorption tower to control the mist drop content in the purified tail gas. Employment of the Claus sulfur recovery and ammonia process desulfurization integrated desulfurization technology in the coal chemical industry can reduce the investment cost of after-treatment, the process can be simpler, and factory environmental protection treatment can form an intensive advantage.

The invention discloses a compound molten iron desulfurizer, which mainly comprises (by weight percent) active lime 60-75, calcium aluminate 5-8, inactivated 4-10, metallic aluminum 5-10, calcium fluoride 4-7, and balancing foreign matter. The desulfurizing agent has low cost and good sulfur removal effect.

The invention discloses a method for desulfurizing sodium sulfide wastewater, belonging to the fields of electronic electroplating wastewater treatment and comprehensive reutilization. The method comprises the following steps: (A) regulating the pH value of sodium-sulfide-containing waste liquor to 6.0-9.0; (B) introducing the sodium-sulfide-containing waste liquor subjected to pH value regulation in the step (A) into an aeration reaction tank, starting an aerator while adding 0.1-10 wt% of catalyst, and reacting for 0.5-2 hours; (C) naturally flowing the mixed solution obtained in the step (B) into a precipitation tank, and standing to precipitate for 1-2 hours; and (D) sending the supernate in the step (C) into the next sewage treatment unit as effluent water, taking out the residual precipitate in the precipitation tank, packing, and transporting. The catalyst is a metal and oxide thereof or a mixture of multiple metals and oxides thereof. The method has the advantages of high oxidization efficiency, thorough desulfurization, simple technique and the like, and can effectively remove sodium sulfide in wastewater.

A raw material for fine desulfurizing agent comprises the following raw materials: 55 to 70 part of basic zinc carbonate, 15 to 30 part of copper carbonate, 8 to 13 part of alumina cement and 1 to 4 part of binder. The raw materials of the fine desulfurizing agent contain basic zinc carbonate and copper carbonate, larger pore paths can be generated in the accumulation process as the copper carbonate molecules have larger volume; and unreacted sulfide can be diffused into crystal lattices of active components more easily, therefore, the fine desulfurizing agent has higher desulfurizing precision and higher sulfur capacity.

The invention relates to a calcium base desulfurater primary and secondary content and impurity elements simultaneous determination method, including the following steps: a calcium base desulfurater analysis sample is quantitatively weighed by a 180-200 mesh analysis sieve, a multi-step microwave digestion method is adopted for carrying out high temperature high pressure mixed acid microwave digestion on the quantitative calcium base desulfurater analysis sample, wherein the mixed acid is 2ml concentrated hydrochloric acid and 4-6ml concentrated nitric acid and the microwave digestion includes three steps, the sample after digestion is transferred for constant volume to prepare analysis solution, namely 2% dilute nitric acid is used for transferring the solution in the digestion inner pipe into a 25-50ml volumetric flask for constant volume to scale; and full spectrum direct-reading plasma emission spectrometer is used for accurately determining contents of multiple elements in the analysis solution. The invention not only can fast and accurately determine primary and secondary content and content of multiple elements in the calcium base desulfurater but also is applicable to determination of multiple elements in grout during desulfuration.

The invention discloses a flue gas desulfurizing method through ammonia process and generating method of by-product ammonium sulfite, which comprises the following steps: making flue gas into cyclone separator and heat exchanger to dedust and cool; atomizing ammonia and (NH4)2SO3 solution in the drying tower; contacting with flue gas to desulfurize; drying; separating; contacting flue gas with (NH4)2SO3 solution in the spray tower; removing residual SO2 and NH3 to lower density; saving ammonia; obtaining by-product (NH4)2SO3.