71results about How to "Reduce alkali metal content" patented technology

The process for preparing tubular titanium oxide particles comprises subjecting a water dispersion sol, which is obtained by dispersing (i) titanium oxide particles and/or (ii) titanium oxide type composite oxide particles comprising titanium oxide and an oxide other than titanium oxide in water, said particles having an average particle diameter of 2 to 100 nm, to hydrothermal treatment in the presence of an alkali metal hydroxide. After the hydrothermal treatment, reduction treatment (including nitriding treatment) may be carried out. The tubular titanium oxide particles obtained in this process are useful as catalysts, catalyst carriers, adsorbents, photocatalysts, decorative materials, optical materials and photoelectric conversion materials. Especially when the particles are used for semiconductor films for photovoltaic cells or photocatalysts, prominently excellent effects are exhibited.

The invention discloses a preparation method of an ultra-large-specification high-Mg aluminum alloy round ingot. The preparation method comprises the following steps of burdening; smelting; preservingheat; carrying out primary refining, and controlling of argon flow; carrying out online degassing refining, and controlling of the rotating speed of a rotor and the argon flow; casting; and carryingout a soaking treatment. According to the method, a hydrogen content and an alkali metal content of the aluminum alloy can be effectively reduced, the probability of cracking of a cast ingot is reduced, and the production percent of pass is improved.

The invention discloses a coal gasifier for slag granulation and a coal gas preparation process. The coal gasifier is mainly composed of a pressure-bearing housing, a slag film gasification device, an annular chamber structure slag basin, a quenching chamber, a conduit, a convection cooling section and the like. The process comprises the following steps: with pulverized dry coal or coal water slurry as a raw material, feeding the raw material to a gasification chamber to burn and gasify together with a gasifying agent from a vortex gasification burner; enabling formed liquid slag to collide with the wall surface of the gasification chamber under the vortex action, and flowing from bottom to top under the action of gravity; feeding to the slag basin of the annular chamber structure, carrying out further gasification reaction together with oxygen fed from the upper part of the slag basin, and discharging from a slag discharge hole; feeding coal gas main airflow to the quenching chamber together with liquid drops, cooling to a specific temperature, and then conveying to the convection cooling section to further lower temperature through the conduit; finally removing dust, purifying and then outputting. The liquid slag drops penetrating through the slag basin are cooled to form solid particles and are collected by a dry slag collector; and the heat is recovered by a slag cooler.

The invention discloses an intermittent sodium removal and purification method for high-sodium coal. According to the method, the temperature and pressure intensity in a reaction vessel are changed multiple times, so that high-sodium coal is compressed and expanded multiple times in the purification vessel under the action of violent change of the temperature and pressure, the structural balance of the raw coal is destroyed repeatedly, sodium and other alkali metals in the surfaces and capillary bores of the high-sodium coal can quickly migrate and be dissolved, and a large amount of elements (such as alkali metals, including sodium, potassium, mercury and sulfur) and ashes migrate or are dissolved in a water-based washing solution, thereby achieving the purpose of upgrading and purifying the raw coal.

The invention relates to a method for removing sodium in Sinkiang high-sodium coal. The method for removing the sodium in the Sinkiang high-sodium coal comprises the following steps: crushing high-sodium raw coal into crushed raw coal in a certain size; washing the crushed raw coal by adopting a high temperature washing solution at a first temperature and a certain pressure to obtain mixed liquor, and stabilizing for a certain time; stirring the mixed liquor for a period of time to obtain a high temperature stirred liquid; cooling the high temperature stirred liquid to a second temperature to obtain a low temperature stirred liquid; carrying out coal water separation on the low temperature stirred liquid to obtain waste liquor and upgraded coal; drying the upgraded coal to obtain low-sodium low-oxygen coal. By virtue of the sodium removing and oxygen removing processes, alkali metal content and oxygen content in the high-sodium raw coal are finally reduced, quality and utilization rate of high-sodium coal are improved, and content of sodium alkali metal volatilized in a combustion process of the high-sodium coal is greatly reduced, so that contamination, scorification and dust stratification caused by combustion of the high-sodium coal are well controlled, heat release during combustion of coal is not influenced, and the treated high-sodium raw coal can be utilized more widely.

The invention provides a preparation method of a biomass charcoal composite fuel for blast furnace injection, which comprises the following steps: mixing crushed biomass raw materials and low metamorphic coal, carrying out hydrothermal carbonization treatment, then mixing with preheated high metamorphic coal, carrying out heat preservation, and finally carrying out hot pressing treatment. According to the method, the yield of biomass hydrothermal carbonization is increased by utilizing mineral substances in the low-rank coal, and meanwhile, ash, volatile components and water in the low-rank coal can be partially removed, so that the caking property is improved. And then the mixture is mixed with the preheated high-metamorphic coal, so that the ignition point of the mixture can be improved, the explosiveness of the mixture is reduced, and the ash fusion point of the composite fuel can be further improved by utilizing the characteristic of high ash fusion point of the high-metamorphic coal. The biomass charcoal composite fuel can completely replace fossil fuel to be used for blast furnace injection, the emission amount of carbon dioxide and pollutants in the ironmaking production process is reduced, and in addition, the fuel formed through hot pressing has the advantages of being large in volume density and high in compressive strength and is suitable for long-distance transportation and long-term storage.

The invention belongs to the technical field of ink, and particularly relates to silk printing impact-resistant glass ink which comprises, by weight, 60-70% of glass powder, 30-40% of pigment and 20-40% of varnish, wherein the glass powder is composed of, by weight, 40-60% of PbO, 20-35% of SiO2, 5-15% of B2O3, 0-10% of ZnO, 0-5% of TiO2, 0-5% of Al2O3, 0-5% of ZrO2, 0-5% of Li2O, 0-5% of K2O, 0-5% of CdO, 0-5% of V2O5 and 0-5% of P2O5. The silk printing impact-resistant glass ink has excellent impact resistance, low expansion coefficient and high safety and resistance to acid and alkali and is simple in preparation process, easy-to-get in equipment and easy in industrial mass production.

The invention provides a coal-based shaft furnace process for treating iron-containing red mud. Through the coal-based shaft furnace direct reduction process, effective and large-scale comprehensive recycling of iron-containing red mud can be realized, and the production process is advanced and reliable, It can achieve large-scale production, stable product quality, low production cost, high production efficiency and good environmental protection; the metallization rate of the produced sponge iron is ≥90%, and the content of impurities and alkali metals is relatively low, which can be used as electric furnace steelmaking Raw materials, partial replacement of blast furnace oxidized pellets, converter coolant and raw materials for magnetic separation process, etc.

The invention discloses a method for preparing bio-oil by catalytically degrading lignin. After lignin, serving as a raw material, is treated with acid, with isopropanol as a solvent, Ru/C as a catalyst, oxygen as a carrier gas and a high-pressure reaction kettle with a heating agitator as a reactor, the bio-oil is prepared by degradation, and lignin first undergoes acid soaking pretreatment. Since the alkali metal content of straw lignin is relatively high, the activity of the catalyst can be decreased; since the method first carries out acid pickling pretreatment on the lignin, the alkali metal content in the lignin can be greatly decreased, and thereby the activity of the catalyst is increased. Moreover, since the method disclosed by the invention adopts the isopropanol as the solvent,the price is low, and the impact on the environment is minor as well. The technological method greatly increases the yield of bio-oil, and the yield of produced oil reaches 72 percent; furthermore, the quality of the prepared bio-oil is high as well, and the C content of bio-oil reaches 69 percent; the selectivity of phenolic compound in oil can also be increased, and the selectivity of the phenolic compound in th oil reaches 53 percent.

An object of the present invention is to provide a method for conveniently producing pyrroloquinoline quinone in the free form without any organic solvent or ion-exchange resin and highly-pure crystals thereof. According to the present invention, there is provided a production method of pyrroloquinoline quinone in the free form and highly-pure crystals thereof, wherein the production method comprises preparing a solution having a pH of 1.5 or less by dissolving an alkali metal salt of pyrroloquinoline quinone to obtain a precipitate.

The present invention provides high boiling point esters solvent with low content of sodium and acid and high-efficiency industry method for preparing the same. The esters solvent can be used in electronic material field with requirement of high-purity quality. Process for preparation of esters solvent is, at the presence of acid catalyst, putting the esterification reaction stock solution got from esterification of alcohol and acid into distilling tower and distilling to get esters solvent, wherein, the reaction stock solution used for distil purifying without neutralization treatment, and after removing low boiling point ingredients by distillation, distilling off the esters solvent via sidetrack distillate pipe disposed in central part of the distilling tower.

The invention discloses a fluorine-containing high-silicon Y molecular sieve and a preparation method thereof, and belongs to the field of molecular sieve synthesis. The anhydrous chemical compositionof the fluorine-containing high-silicon Y molecular sieve is hF.kM.mR1. NR2. (SixAly) O2, and the silica-alumina ratio of the fluorine-containing high-silicon Y molecular sieve is 25-100. The methodcomprises the following steps: a) mixing raw materials containing an aluminum source, a silicon source, an alkali metal source, a fluorine source, an organic template agent R2 and water to obtain initial gel, then adding a guiding agent or a silicon-aluminum molecular sieve seed crystal, and stirring to obtain synthetic gel; b) dewatering the synthetic gel to obtain a dry powder mixture; and c) crystallizing the dry powder mixture. According to the method disclosed by the invention, the fluorine-containing high silicon Y molecular sieve has characteristics of high silica-alumina ratio, low alkali metal content and easy ion exchange, and the preparation method has characteristics of rapid crystallization rate, simple process, and easy large-scale industrial production.

The invention belongs to the technical field of electrode material preparation, and in particular relates to spherical super-capacitor activated carbon, and a preparation method and application thereof. The specific surface area B of the spherical super-capacitor activated carbon is 1500-4000 m<2>/g. The invention also provides the preparation method of the spherical super-capacitor activated carbon. The preparation method comprises the following steps: 1) carbonizing a spherical polymer; 2) pre-activating the product obtained in the step 1); and 3) mixing the product obtained by pre-activation in the step 2) with an alkaline compound, and carrying out activation. According to the preparation method provided by the invention, the super-capacitor activated carbon can be prepared at good yield and low cost, and the obtained activated carbon has a good spherical profile and a low metal content, so that the prepared spherical activated carbon can be used as an electrode material of super-capacitors.

The invention relates to a burning power generation utilization method of high-sodium-content coal, aiming at solving the problem that no method with simple process and low processing cost is provided for processing high-sodium-content coal at present. The raw high-sodium-content coal is characterized in that a dry-ash-free volatile component (Vadf %) accounts for 30 to 50% in content; coal ash comprises 2.0 to 18.0% of basic metal Na2O in content, 0.5 to 9.5% of K2O in content, 6.0 to 42.0% of CaO in content, 1.5 to 15.0% of MgO in content, and 4.0 to 18.0% of Fe2O3 in content. The method comprises the following steps: A, crushing the raw coal, and grinding by a wet method; B, mechanically dehydrating pulverized coal; C, drying pulverized coal; D, thermally decomposing coal; E, burning sodium-free coal to generate power. The method is simple in process, low in processing cost and high in utilization rate of coal resource, and can effectively ease the problems that a boiler is easily polluted and slag bonding is generated in the direct burning utilization of the high-sodium-content coal.

The invention relates to a preparation method for a composite denitration catalyst with a layered structure. The catalyst is prepared with organic modified layered clay, cerium salt and molybdate as precursors through adsorption, impregnation, extrusion molding, drying and calcination, wherein the mol ratio of molybdenum to cerium in the catalyst is (0.10-0.25): 1; and the total mass of cerium andmolybdenum metal elements accounts for 35 to 50% of the mass of the catalyst. The catalyst has large surface area; composite oxide nanoparticles are uniformly dispersed in the layered structure of the clay; the catalyst used as a flue gas denitration catalyst shows high denitration efficiency and wide temperature window; meanwhile, the catalyst has high stability, water resistance and sulfur poisoning resistance. In addition, the organic modified layered clay can effectively reduce alkali metal in the clay and improves the denitration performance of the catalyst. The clay used in the composite material has extensive sources, cheap price, low cost and environmental friendliness.