455 results about "Sulfur trioxide" patented technology

A system and method for amending out of specification ash to a suitable amended addition material to a concrete mixture includes analyzing a unit quantity of out of specification ash to determine concentrations of each of calcium oxide, sulfur trioxide, and unburnt carbon. The out of specification ash is sieved to determine fineness. Based upon measured concentrations and determined fineness, a mixture is designed to add materials in design-determined quantities of each of quicklime, kaolin, masonry silica blend, manufactured sand and in specification fly ash. By adding each of the quicklime, kaolin, masonry silica blend, manufactured sand and in specification fly ash in each of the design-determined quantities, creating an amalgamated blend of added materials to form an amended addition material. The amended addition material is substituted for a selected quantity of Portland cement in the concrete mixture.

The invention discloses a preparation device and a preparation method of electronic-grade sulfuric acid. The device mainly comprises a sulfuric acid storage tank, a wiped-film evaporator, a liquid storage tank, a sulfur trioxide absorption tank, a packing absorption tower, a heat exchanger, a filter and the like. A fuming sulfuric acid storage tank is conveyed to a wiped-film evaporator through a diaphragm pump to evaporate sulfur trioxide, the evaporated sulfur trioxide is subjected to circular absorption reaction to generate sulfuric acid, and electronic-grade sulfuric acid is obtained after filtration. The method is simple in technological process, low in evaporation process temperature, high in efficiency and low in metal residue, and high-quality electronic-grade sulfuric acid is obtained.

The invention relates to the technical field of electronic-grade sulfuric acid, and discloses a method for preparing electronic-grade sulfuric acid. Industrial-grade liquid sulfur trioxide is subjected to gasification, demisting, dehumidification and purification to prepare ultra-pure sulfur trioxide; absorbing sulfur trioxide by using electronic-grade sulfuric acid to prepare an electronic-grade sulfuric acid crude product; the electronic-grade sulfuric acid crude product is subjected to degassing, hydrogen type macroporous cation resin modification and continuous multi-group high-efficiency membrane combined filtration to obtain electronic-grade sulfuric acid; according to the modified hydrogen type macroporous cationic resin disclosed by the invention, the surface characteristics of the resin are changed through acylation reaction, so that the modified hydrogen type macroporous cationic resin shows better selectivity and affinity in the subsequent metal ion adsorption process; the introduced multi-sulfydryl functional group provides more adsorption sites for the resin, and the sites and metal ions can form a stable complex, so that the metal ions in a solution are effectively adsorbed and removed, and metal ion impurities in electronic-grade sulfuric acid are further reduced; the purity of the prepared electronic-grade sulfuric acid is 99.9999999%, the content of metal ions is only 5 ppt, and the electronic-grade sulfuric acid can meet the quality requirement of semiconductor-grade G5 of an ultra-large integrated circuit.

The invention belongs to the technical field of masonry cement, and particularly discloses all-solid-waste low-carbon-emission masonry cement and a preparation method thereof. Comprising the following steps: 1, finely grinding iron tailings, carbide slag, fly ash and silica fume, and proportioning according to a design to obtain a cement raw material; 2, agglomerating or pelletizing the cement raw material, and calcining according to a designed temperature to obtain a cement clinker; and 3, mixing the cement clinker with a certain proportion of gypsum, and grinding to the target fineness to obtain the masonry cement. The masonry cement is prepared from all solid wastes, meanwhile, a calcium source is mainly provided by the carbide slag with low carbon emission, compared with cement fired by calcium carbonate calcium sources, the carbon emission is greatly reduced, the goal of high-valued and green utilization of various solid wastes including iron tailings is achieved, and the method is suitable for industrial production. The compressive strength, the sulfur trioxide content and the screen residue of the prepared masonry cement meet the national standard requirements of masonry cement. In addition, the masonry cement is prepared from all solid waste raw materials, so that the preparation cost of the masonry cement is reduced.

The invention relates to the technical field of separation and evaporation of sulfur trioxide, and discloses a device and a process for producing liquid sulfur trioxide by utilizing a film evaporator, the separation of gas-phase sulfur trioxide and low-concentration fuming acid is realized by utilizing the film evaporator, and the liquid sulfur trioxide is separated from the low-concentration fuming acid under the action of gravity and a rotary movable scraper of the film evaporator. Nicotinic acid forms an underspin film on the inner wall of the cylinder wall, and liquid is distributed into a uniform film, so that sulfur trioxide is quickly evaporated, and the evaporation capacity per unit area can be about 6-9 times that of a traditional evaporator; and meanwhile, under the action of high-speed rotating film scraping of the circumference, the heating time is short, the retention time of low-concentration nicotinic acid on the wall surface is shortened, and corrosion of the low-concentration nicotinic acid to the inner wall of the cylinder body at high temperature is avoided. According to the invention, the cyclone is arranged in the film evaporator, so that the material is prevented from being carried by gas, the removal efficiency of fog drops with the particle size of more than 1 micron reaches more than 99.9%, and the evaporation rate can be effectively improved by 1.0-2.6%.

The invention discloses an acid-making process using hydrogen sulfide waste gas and waste sulfuric acid, and relates to the technical field of acid-making processes, and the acid-making process specifically comprises the following steps: step 1, high-temperature reaction and gas generation, step 2, gas purification and conversion, a demister and a spraying assembly are used for removing dust, impurities and harmful substances in the gas; and step 3, sulfur trioxide absorption and sulfuric acid preparation. According to the acid-making process using the hydrogen sulfide waste gas and the waste sulfuric acid, the absorption slurry is sprayed out through the nozzle to be in countercurrent contact with the gas mixture, physical absorption and chemical reaction are combined, dust, impurities and other harmful substances in the gas mixture are effectively removed, and the gas purification efficiency is improved; the nozzles at the upper end and the lower end are used for spraying and cleaning the corrugated plate, it is ensured that the corrugated plate is always kept clean, system efficiency reduction caused by blockage or pollution of the corrugated plate is reduced, and the operation efficiency and stability of the whole system are improved.

The utility model provides a reaction system for continuously synthesizing dimethyl sulfate, which comprises an absorption module I, an absorption module II, a reaction module I, a reaction module II and a pipeline module, the absorption module I and the absorption module II respectively comprise an absorption tower, a circulating tank, a circulating pump and a condenser, the reaction module I and the reaction module II respectively comprise a reaction tower, a circulating tank, a circulating pump and a condenser, and the pipeline module comprises a sulfur trioxide feeding pipeline, a dimethyl ether feeding pipeline, a crude dimethyl sulfate feeding pipeline, a tail gas conveying pipeline and a product conveying pipeline. The reaction system disclosed by the utility model realizes continuous generation of dimethyl sulfate, is simple to operate, low in device investment, high in reaction rate and high in yield, and provides a guarantee for realizing large-scale industrial production.

The invention discloses a denitration catalyst with a low sulfur dioxide oxidation rate, a preparation method of the denitration catalyst and application of the denitration catalyst in removal of nitrogen oxides through ammonia selective catalytic reduction. The denitration catalyst with the low sulfur dioxide oxidation rate is a titanium dioxide loaded vanadium pentoxide, molybdenum oxide and cerium oxide catalyst subjected to phosphorylation treatment. The preparation method comprises the following steps: (1) preparing a first solid-liquid mixture in which a vanadium pentoxide precursor, a molybdenum oxide precursor, a cerium oxide precursor and titanium dioxide are uniformly dispersed, drying the first solid-liquid mixture, grinding and roasting to obtain an intermediate product; and (2) preparing a second solid-liquid mixture in which the intermediate product and the precursor for phosphorylation are uniformly dispersed, drying the second solid-liquid mixture, grinding, and roasting to obtain the denitration catalyst with low sulfur dioxide oxidation rate. The low-cost control of NOx is realized, and the generation of sulfur trioxide is reduced at the same time.

The invention discloses a continuous preparation method of sodium tanshinone IIA sulfonate based on a single-tube thin-layer liquid membrane reactor. Comprising the following steps: (1) dissolving tanshinone IIA in an organic solvent as a feed liquid; (2) reacting gas-phase sulfur dioxide with air, and cooling to obtain sulfur trioxide mixed gas; (3) enabling the feed liquid and sulfur trioxide mixed gas to enter a single-tube thin-layer liquid membrane reactor in a parallel flow or reverse flow manner, and carrying out continuous sulfonation reaction to obtain reaction liquid; and (4) adding a sodium salt aqueous solution into the reaction solution to carry out salt forming reaction, centrifuging, drying and purifying to obtain the tanshinone IIA sodium sulfonate. According to the invention, a novel method is adopted to carry out sulfonation reaction on tanshinone IIA, and sulfur trioxide is basically completely consumed after the reaction is finished, so that the generation of waste acid is greatly reduced, and the method has important significance on environmental protection and cost reduction. The green, safe, efficient and continuous preparation of the high-purity tanshinone IIA sodium sulfonate is realized.

Methods and associated production plants are disclosed for producing concentrated oleum or sulfur trioxide therefrom with high purity, and particularly with minimal sulfur dioxide. The methods involve use of a single contact, single absorption sulfuric acid plant operating under an unconventional set of parameters including: reacting sulfur and high purity oxygen in a combustion reactor to form sulfur dioxide at a concentration between 11.5 and 20% by volume and with an atypical oxygen to sulfur dioxide molar ratio ≥ 1; atypically catalytically converting > 96% by volume of the sulfur dioxide to sulfur trioxide in a contact apparatus; and atypically recycling > 95% by volume of the total gases from an absorption apparatus to the combustion reactor. Concentrated oleum with < 300 ppm dissolved sulfur dioxide can desirably be produced with sulfur utilization ≥ 80% using a smaller, cost-effective sulfuric acid plant. The co-production of unnecessary sulfuric acid can also be reduced.

The invention provides a coal-based solid waste foamed cement material for filling a coal mine tunnel and a preparation method of the coal-based solid waste foamed cement material. The coal-based solid waste foamed cement material comprises 10-30 parts of coal gasification coarse slag micro powder, 0-30 parts of first-grade fly ash, 70-90 parts of cement, 0.3-0.8 part of a foam stabilizer and 0.1-0.5 part of an additive, the coal-based solid waste foamed cement material is further doped with foam, the mixing amount of the foam is 2-5 times of the volume of the cement slurry, the coal gasification coarse slag micro powder is coal water slurry furnace gasification coarse slag, and the coal gasification coarse slag micro powder is prepared from, by mass, 40% of silicon dioxide, 19% of aluminum oxide, 15% of ferric oxide, 16% of calcium oxide, 3% of sulfur trioxide, 3% of sodium oxide, 1% of magnesium oxide and 0.5% of titanium oxide. And 0.5% of potassium oxide. According to the invention, a physical foaming method is utilized, coal-based solid waste is used as a raw material to replace part of cement, and the foamed cement material with light weight and high strength is prepared, so that the foamed cement material meets the use requirements of underground roadway filling.

The invention belongs to the field of medicine, health and health, and particularly relates to a preparation method for controllably synthesizing polysulfonic acid mucopolysaccharide with different molecular weights, which comprises the following steps: reaction, acid-base neutralization, formamide removal by alcohol precipitation, desalting and freeze-drying. Wherein the reaction process comprises the following steps: adding sodium chondroitin sulfate and a pyridine sulfur trioxide complex into a mixed solvent of N, N-dimethylformamide and dimethyl sulfoxide, and heating for reaction to obtain a reaction mixture; the volume fraction of the dimethyl sulfoxide in the mixed solvent is 0-80%. According to the method, the low-price pyridine sulfur trioxide complex (about 150 yuan / 500g) is used, and the ratio of N, N-dimethylformamide to dimethyl sulfoxide in the mixed solvent is adjusted, so that the solubility of the chondroitin sulfate sodium and the pyridine sulfur trioxide complex is changed, and the polysulfonic acid mucopolysaccharide with molecular weights in different ranges can be regulated and generated.

The invention relates to the technical field of sulfuric acid production, in particular to a flue gas separation and purification system applied to preparation of electronic-grade sulfuric acid. Comprising a primary treatment tank for removing flue gas impurities, a secondary treatment tank for absorbing sulfur trioxide gas in flue gas, an evaporation tower for evaporating the sulfur trioxide gas from nicotinic acid and a condensation tank for efficiently liquefying the sulfur trioxide gas, impurities and sulfur trioxide gas in flue gas are deeply removed and efficiently enriched through the multi-stage treatment tank in a dual mode of liquid film absorption and spraying absorption, nicotinic acid is subjected to multi-stage evaporation through the preheating cylinder and the evaporation pipe, and separation and purification of the sulfur trioxide gas are achieved in cooperation with the condensation tank and the condensation assembly. And multi-stage condensation treatment combining path extension type pre-condensation, small-strand distributed type secondary condensation and dynamic rotary type comprehensive condensation is carried out, so that an efficient and high-quality condensation purification effect is further achieved.

The present disclosure provides anionic citrate-based composition for use in regenerative applications. The disclosed composition may take the form of a scaffold and generally includes (i) a citrate component, (ii) a diol, and (iii) an anionic moiety. The anionic moiety may include one or more of a sulfate, sulfonate, phosphate, phosphonate, sulfamate, or carboxylic acid, The sulfate and / or sulfonate containing moiety may be conjugated via an amidation reaction, esterification, and / or substitution reaction with a sulfur trioxide complex. A peptide may be conjugated to a surface of the composition.

The invention provides a device and a process for preparing sulfuric acid from wet-process acid gas, the device comprises an incinerator, a first waste heat boiler, a sulfur dioxide converter, a second waste heat boiler, a condenser and an activated carbon reactor which are sequentially connected through a pipeline, and the sulfur dioxide converter comprises four catalyst bed layers which are sequentially arranged from top to bottom; two air supplement valves and two interlayer heat exchangers are arranged on the sulfur dioxide converter; and a return pipe is communicated between the activated carbon reactor and the condenser. The process provided by the invention can treat various working conditions of feed gases with different concentrations, can adjust the oxygen concentration in the catalyst bed layer according to the change of the feed gas concentration, performs emergency cooling on the catalyst bed layer when an overtemperature phenomenon occurs in the catalyst bed layer, and adopts an activated carbon reactor at the tail end to adsorb and convert sulfur dioxide to obtain dilute sulfuric acid. Dilute sulfuric acid flows back to the condenser to spray sulfur trioxide, sulfuric acid with high concentration is obtained, no waste water is generated in the whole process, and tail gas is discharged after reaching the standard.

The utility model relates to the technical field of environmental protection, in particular to a down-flow type peculiar smell purification system for a pot-type calcining furnace. Comprising a down-flow pot-type calcining furnace, the air outlet end of the down-flow pot-type calcining furnace is connected with a dust remover, and the dust remover is connected with an exhaust chimney through an exhaust pipe; a gate valve is arranged on the exhaust pipe; an induced draft fan is arranged on the exhaust pipe between the gate valve and the dust remover; the lower end of the gate valve is connected with a drainage pipeline; the drainage pipeline is connected with a return flue gas conveying pipeline; and the return flue gas conveying pipeline is connected with an air door of the downstream pot-type calcining furnace through a branch pipeline. A down-flow pot-type calcining furnace peculiar smell purification system is the earliest attempt in the same industry of carbon; the harm of poisonous and harmful gases such as sulfur dioxide, sulfur trioxide, nitrogen oxide, dust, carbon monoxide and carbon dioxide in the flue gas of the dust remover of the calcining furnace to post staff is solved.

The invention discloses a clean production process for contaminated acid treatment, which comprises the following steps: (1) after contaminated acid is subjected to heavy metal removal pretreatment, adding iron oxide / iron and copper oxide / copper into the contaminated acid to carry out neutralization reaction, and carrying out solid-liquid separation to obtain a ferric sulfate / ferrous sulfate solution and a copper sulfate solution; (2) concentrating and crystallizing the ferric sulfate / ferrous sulfate solution and the copper sulfate solution which are generated by neutralizing the waste acid; (3) roasting the ferric sulfate / ferrous sulfate and copper sulfate crystals step by step to remove crystal water; (4) carrying out high-temperature roasting on the ferric sulfate / ferrous sulfate or copper sulfate after the crystal water is removed, and decomposing into ferric oxide, copper sulfate, sulfur dioxide or sulfur trioxide; the obtained ferric oxide and copper oxide are recycled for neutralization treatment of waste acid after being recycled, and the obtained sulfur dioxide and sulfur trioxide can be recycled for sulfuric acid production. The waste acid is subjected to circulating neutralization treatment, so that the generation of traditional waste acid neutralization slag is avoided, and the resource utilization of sulfur is also realized.

The invention discloses a method for jointly recovering zinc and cadmium from zinc-cadmium slag of zinc hydrometallurgy. The method comprises the following steps: S1, carrying out acid leaching on the zinc-cadmium slag and adding zinc powder for replacement; s2, sponge cadmium is subjected to vacuum melting; s3, adding clear water and calcium oxide into the cadmium alkaline residues for wet grinding, filtering to obtain clear liquid and filter residues, and returning sodium hydroxide obtained after the clear liquid is evaporated and crystallized to S2; s4, the filter residues are subjected to reduction roasting, recyclable zinc-cadmium smoke dust, calcium oxide residues and sulfur trioxide are obtained, the calcium oxide residues are returned to S3, sulfuric acid is prepared from sulfur trioxide, and a part of sulfuric acid is returned to S1; the other part of sulfuric acid enters the next step; s5, the smoke dust is dissolved with sulfuric acid, a sulfuric acid solution containing zinc and cadmium is obtained, then zinc powder is added for replacement, and sponge cadmium and a zinc sulfate solution are obtained; the sponge cadmium returns to S2, and the zinc sulfate returns to S1. According to the method, the cadmium alkaline residue treatment product can be effectively recycled and utilized, the cadmium alkaline residue treatment cost is reduced, no cadmium element flows out of the process to cause environmental pollution, and the method is an environment-friendly process method.

The invention relates to the field of sulfur-containing waste treatment, and discloses a method and a system for recovering sulfur element in sulfur-containing waste, and the method comprises the following steps: firstly, decomposing the sulfur-containing waste into first process gas containing sulfur dioxide; carrying out a first catalytic oxidation reaction on the first process gas, and condensing to obtain a second process gas; performing a second catalytic oxidation reaction on the second process gas, and condensing to discharge tail gas to be treated; according to the method, sulfur-containing waste is decomposed into gas containing sulfur dioxide through the reaction furnace, sulfur dioxide is catalytically oxidized into sulfur trioxide through the reaction tower, sulfur trioxide is condensed into concentrated sulfuric acid through the condensing tower, and the sulfur element recovery liquid is obtained. The sulfur-containing waste is decomposed into process gas containing sulfur dioxide in the reaction furnace, and the recovery rate of the sulfur element is not lower than 99% through two times of catalytic oxidation and two times of condensation.

The invention discloses a denitration and dust removal fault analysis system and method based on ammonia-sulfur ratio calculation, relates to the technical field of environment-friendly emission of coal-fired power plants, and realizes early warning and intelligent response to faults of a denitration system. The method comprises the following steps: collecting flue gas parameters, coal quality parameters and unit parameters; calculating the ammonia escape concentration based on the ammonia spraying amount in the flue gas parameters and the unit parameters to obtain an ammonia escape concentration predicted value; determining a sulfur dioxide concentration and a target conversion rate according to the coal quality parameters and the unit parameters, calculating a sulfur trioxide concentration according to the sulfur dioxide concentration and the target conversion rate, and calculating an ammonia-sulfur ratio according to the sulfur trioxide concentration and an ammonia escape concentration prediction value; determining the generation amount of ammonium bisulfate, and reading the equipment temperature in the unit parameters; and according to the ammonium bisulfate generation amount, the ammonia-sulfur ratio and the equipment temperature, determining an early warning grade and a response measure, adopting an execution mechanism module to execute the response measure, and sending an early warning signal corresponding to the early warning grade to a specified terminal.

The invention relates to the technical field of concentrated sulfuric acid production, and particularly discloses a sulfuric acid thickening device which comprises a waste acid regeneration unit for burning sulfur-containing waste acid and acid gas to produce sulfuric acid and a sulfuric acid thickening unit for thickening the sulfuric acid generated by the waste acid regeneration unit, the sulfuric acid thickening unit comprises a combustion chamber, and liquid sulfur is combusted in the combustion chamber to generate sulfur dioxide. A steam generating device is arranged in the combustion chamber, the combustion chamber is connected with the reactor through a process gas conveying pipe, sulfur dioxide is subjected to a catalytic reaction in the reactor to generate sulfur trioxide, and the reactor is connected with the absorption tower through a process gas discharging pipe; unqualified sulfuric acid and reflux sulfuric acid in the waste acid regeneration unit absorb sulfur trioxide in an absorption tower to generate sulfuric acid, and the sulfuric acid is thickened; the invention also provides a method for producing concentrated sulfuric acid by using the device. According to the device, sulfuric acid with the concentration lower than 98wt% can be prepared into concentrated sulfuric acid with the concentration higher than 98wt%, the product income is increased, meanwhile, steam is generated as a byproduct, and the benefits of the device are increased.

Provided herein are methods and systems for treating a sulfur dioxide-containing gaseous stream. The method includes combusting a tail gas in an excess of oxygen gas to yield a thermal oxidizer effluent containing sulfur dioxide and oxygen. The thermal oxidizer effluent is introduced to an oxidative catalytic converter to convert sulfur dioxide to sulfur trioxide, thereby forming an oxidized gas stream. The oxidized gas stream is routed to a quench tower and contacted with a dilute aqueous acid quench stream to yield sulfurous acid, hydrated sulfur dioxide, or both. The sulfurous acid or hydrated sulfur dioxide is oxidized with the excess of oxygen from the thermal oxidizer effluent to yield sulfuric acid.

The invention provides a treatment method of sulfuric acid process titanium dioxide acidic waste, the sulfuric acid process titanium dioxide acidic waste comprises acidic wastewater and titanium concentrate acidolysis slurry, and the method comprises the step of separately treating the acidic wastewater and the titanium concentrate acidolysis slurry. According to the method, the acid wastewater and the titanium concentrate acidolysis slurry are subjected to neutralization, sedimentation and squeezing treatment separately, so that the neutralization rate, the sedimentation rate and the sedimentation effect are improved, the consumption of a neutralizer is reduced, meanwhile, the product quality of titanium gypsum neutralized by the acid wastewater is improved (the content of sulfur trioxide is greater than or equal to 30%), and in addition, the yield of titanium is also increased.

The invention discloses a sulfur-containing waste gas and waste liquid treatment method and equipment, and particularly relates to the technical field of sulfur-containing waste gas and waste liquid treatment.The sulfur-containing waste gas and waste liquid treatment method is characterized in that a cracking incineration unit, a catalytic oxidation unit, a condensation and concentration unit and a tail gas purification unit are included; sulfur-containing waste gas and waste liquid are sequentially cracked and incinerated into sulfur dioxide, then converted into sulfur trioxide and condensed to form sulfuric acid, sulfur dioxide in tail gas is converted and washed to form dilute acid, sulfuric acid trioxide mist in the tail gas is removed under the action of a high-voltage electric field, and the tail gas is discharged from a chimney. And the effects of ultra-clean emission and high total sulfur recovery rate are achieved under the condition of meeting tail gas emission indexes.

The present application relates to the production of electronic-grade chemicals, and in particular to a method and system for producing electronic-grade sulfuric acid by absorption. A method for producing electronic-grade sulfuric acid by absorption includes: cooling the waste gas generated after the combustion of liquid sulfur to produce industrial sulfuric acid, and catalytically converting it with a modified metal organic framework catalyst; evaporating high-oleum sulfuric acid to obtain sulfur trioxide gas and low-concentration oleum sulfuric acid; the heat utilized in the evaporation of oleum sulfuric acid is the heat generated by the cooling of the converted flue gas; the produced low-concentration oleum sulfuric acid is contacted with the forwarded flue gas to obtain high-concentration oleum sulfuric acid; the obtained high-concentration oleum sulfuric acid is repeatedly evaporated and purified; the purified sulfur trioxide gas is absorbed by sulfuric acid to produce electronic-grade sulfuric acid. The present application utilizes the waste gas and heat generated when liquid sulfur is used to produce industrial sulfuric acid to produce G5-grade electronic-grade sulfuric acid, which greatly saves energy and reduces energy consumption.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.

The invention discloses a system and a method for preparing sulfuric acid from sulfur foam and desulfurization waste liquid. The system is formed by sequentially connecting a pretreatment unit, an incineration cooling unit, a dust removal filtering unit, a conversion unit, an acid forming unit and a desulfurization unit. The pretreatment unit is used for preparing liquid sulfur and salt slurry from sulfur foam, the incineration cooling unit is used for preparing sulfur dioxide gas, the dust removal filtering unit is used for removing dust in flue gas, the conversion unit is used for converting sulfur dioxide in the flue gas into sulfur trioxide, and the acid forming unit is used for combining the sulfur trioxide in the flue gas with water into sulfuric acid steam; the sulfuric acid steam is condensed into sulfuric acid and then is conveyed into a sulfuric acid storage tank to be stored, and the desulfurization unit is used for removing trace sulfur dioxide from the flue gas conveyed by the acid forming unit. Sulfur foam and desulfurization waste liquid generated after purification and desulfurization in the coking plant are converted into sulfuric acid raw materials needed by an ammonium sulfate workshop in the coking plant, no dilute sulfuric acid or desulfurization product is discharged in the production process, heat is fully utilized, the amount of byproduct steam is large, and waste is turned into wealth.

The present application relates to the technical field of building materials, and particularly relates to a belite cement clinker, a preparation method thereof and a belite portland cement, the mineral composition of the belite cement clinker comprises: C3S 5%-60%, C2S 25%-80%, C3A 1%-8%, C4AF 5%-15%, C5S2Ṡ1-3%, C 10 S4ṠF21-3%, free calcium oxide is less than 1.0%, wherein, Ṡ represents sulfur trioxide. The belite cement clinker is used to prepare a cement product by adding appropriate amount of gypsum, the 3d strength of the cement product is between 13MPa and 35MPa, the 28d strength can reach 60MPa-70MPa, and the 56d strength is as high as 72MPa.

The invention provides a sulfur trioxide monitoring and emission control optimization adjustment method, and belongs to the technical field of optimization adjustment, and the method comprises the steps: carrying out the real-time synchronous monitoring of sulfur trioxide in supercritical boiler flue gas through different types of sensors, carrying out the data preprocessing and data fusion processing of a synchronous monitoring result, and carrying out the real-time monitoring of the sulfur trioxide in the supercritical boiler flue gas; and correcting the processed data by combining a correction model established with the parameters of the supercritical boiler, carrying out deep mining on historical monitoring data, historical operation parameters of the supercritical boiler and historical operation states of the flue gas treatment equipment, establishing a sulfur trioxide control model, and carrying out real-time monitoring on the sulfur trioxide control model. And a cooperative control instruction of the flue gas treatment equipment and desulfurization adjustment parameters in a desulfurization system are determined according to an output result, optimization control adjustment is performed, a model is established, an effective control result is output through analysis of a current monitoring result, and optimization and regulation of the equipment are intelligently realized.

The invention discloses a treatment process and a treatment system for crystallization of photovoltaic wastewater calcium fluoride sludge, limestone particles and photovoltaic sludge are mixed according to a mass ratio of 3%-5% to obtain a homogeneous mixed material, the homogeneous mixed material is pre-dried and then fed into a rotary kiln, sintering is carried out at 1200-1500 DEG C for 1.5-3 hours, and the sintered material is cooled to room temperature. Calcium fluoride is attached to the surface of the silicate framework, sulfur trioxide and calcium oxide are released at the same time, after sintering is finished, the material is subjected to annealing treatment in a rotary kiln, calcium fluoride seed crystals accounting for 0.1%-1.0% of the total mass of the material are added, calcium fluoride crystals are induced to grow directionally and be repaired, and the calcium fluoride is obtained. According to the method, the purity of calcium fluoride is increased to 75%-85%, the sulfur content in the product can be controlled to be 0.1% or below, and the cold compressive strength of the pellets prepared from the product reaches 2.5 MPa or above.