923 results about "Acid dissolution" patented technology

The invention relates to a preparation method for red mud-based iron-series catalyst and application of the red mud-based iron-series catalyst in hydrogen production through cracking of methane. The preparation method is characterized in that alumina industrial waste, i.e., red mud, is used as a raw material and undergoes acid dissolution treatment, then a certain amount of iron is added into the treated red mud by using a homogeneous coprecipitation method and then drying, calcining and hydrogen reduction are successively carried out so as to obtain the red mud-based iron-series catalyst. The red mud-based iron-series catalyst has a more prosperous pore structure and higher content of active metal iron compared with red mud, the particle size of the catalyst is uniform, and the dispersity of metallic iron is good. The method has the following advantages: mineral components with catalytic and catalysis-assisting functions in red mud are given to full play; the pore structure of red mud is improved; introduction of iron enables the content of the active component of the catalyst to be increased, and activity and stability of red mud in catalytic cracking of methane for hydrogen production are substantially improved; and preparation cost for the catalyst for hydrogen production through cracking of methane is reduced, and an approach for resourceful and comprehensive utilization of red mud is created.

The invention provides a cobalt nickel metallurgy wastewater sludge recycling method, and belongs to the field of waste recycling. The method comprises the following steps: carrying out acid dissolution reduction on cobalt nickel metallurgy wastewater sludge to leach out valuable metals in the wastewater sludge, displacing copper by using manganese powder to recover copper, precipitating zinc by using manganese sulfide to recover zinc, using a fluoride to remove calcium and magnesium from the obtained zinc removed solution, carrying out advanced impurity removal and cobalt nickel manganese enrichment by using a P2O4 extractant, and carrying out advanced impurity removal on the obtained solution rich in cobalt, nickel and manganese by using manganese sulfide to obtain a solution for preparing an NCM ternary precursor. The method allows nickel, cobalt, manganese, zinc, copper and other metals to be completely recovered and the obtained cobalt, nickel and manganese solution to be used to prepare the NCM ternary precursor as a raw material, avoids cobalt, nickel and manganese separation, and also has the advantages of simple process, substantial improvement of the metal recovery rate, low cost, harmlessness to environment, and industrialization prospect.

The invention provides a method for extracting tellurium from tellurium copper slags. The method includes the following steps of (1) sulfating calcination at a high temperature, grinding the tellurium copper slags, mixing ground tellurium copper slags with a concentrated sulfuric acid to calcine, enabling the mass ratio between the concentrated sulfuric acid and the tellurium copper slags to be (1.2-1.5):1, maintaining the calcination temperature in a range from 450 DEG C to 600 DEG C and maintaining the calcination time in a range from 3 hours to 5 hours; (2) alkaline leaching to separate the tellurium, leaching obtained calcination slags by a sodium hydroxide alkaline liquor, and then filtering to obtain a tellurium containing alkali leaching liquid and alkali leaching slags; (3) oxidizing the alkali leaching liquid, oxidizing the tellurium containing alkali leaching liquid by sodium hypochlorite of an oxidant and then filtering to obtain sodium tellurate filtered slags; and (4) acid dissolution reduction, dissolving the sodium tellurate filtered slags by a chloridion containing acidic system, adding a reducing agent to achieve reduction and then filtering to obtain tellurium powders. According to the method for extracting the tellurium from the tellurium copper slags, a complete separation of copper, selenium and tellurium can be fully achieved, a comprehensive recovery of the copper, selenium and tellurium can be achieved, the technological process is simple, tellurium dioxide of an intermediate product is not required, the tellurium powders with a high purity can be directly produced, and the tellurium powders can serve as raw materials of 6N high purity tellurium.

The invention discloses a method for preparing battery-grade nickel sulfate and cobalt sulfate from mixed nickel cobalt hydroxide, and belongs to the technical field of nickel cobalt hydrometallurgy.The method comprises the following steps that the mixed nickel cobalt hydroxide is leached by using sulfuric acid, iron and aluminum in the solution are removed by using a nickel/cobalt/manganese-based neutralizer, liquid-solid separation is carried out to obtain iron-removed slag, nickel and cobalt are recycled through acid dissolution, a precipitator (one or more of nickel fluoride, and cobalt fluoride and manganese fluoride) is added into iron-removed liquid to remove calcium and magnesium ions in the system. Impurities such as Mn, Cu and Zn are removed from the calcium and magnesium removed liquid by using a saponified P204 extractant, nickel and cobalt are separated from the P204 raffinate by using a saponified P507 extractant to obtain battery-grade nickel sulfate and a cobalt sulfate solution, and evaporative crystallization is carried out to obtain a product. According to the method, the use amount of calcium oxide is greatly reduced, the amount of calcium ions introduced intothe system and the corresponding nickel-cobalt loss are greatly reduced, the influence of calcium sulfate crystallization on extraction is avoided, the P507 extraction operation amount is reduced, andthe purification cost is reduced.

The invention discloses a method that can simultaneously analyze various elements, aims at solving the defects that currently the analysis of various elements cannot be finished at one time, and consequently the analysis time is long and the reagent usage is large, and discloses a method that can simultaneously measure the elements of silicon, aluminum, calcium and barium and comprises the following steps: a test sample is preprocessed through the acid dissolution method, microwave-digested, naturally cooled, and then placed into a volumetric flask with scales, diluted and shaken until well distributed, a solution with a standard working curve is prepared, an atomic emission spectrograph of inductance coupled plasmas is started and led to reach the measurement requirement, a plasma torch is lighted, the relative standard deviation of the plasma torch is led to be less than 5 percent, wavelength of each element is chosen, the working curves are plotted, and the content of each element is computed. The method combines the microwave digesting sample dissolution technique with the atomic emission spectrograph of inductance coupled plasmas, can simultaneously analyze nine elements including silicon, etc., is accurate and quick, has greatly reduced reagent usage, and reduces the environmental pollution that is caused by chemical reagents.

The invention discloses a production method of folacin without sewage discharge and a technological process thereof comprises crude product production, acid dissolution process, alkali dissolution process and refining process. The sewage discharge is reduced to zero, meeting the requirements of national environment protection and saving water and cost. The production method of the invention leads the yield of crude products to be increased from the original 80 percent to present 85 percent, thus improving product yield so as to decrease waste and improve the rate of production.

The invention relates to gelled acid used for acid fracturing of a high-temperature fractured-vuggy type carbonate reservoir. The gelled acid comprises components in percentage by weight as follows: 20% of hydrochloric acid (HCl), 3% of a gelling agent (TP-1), 2% of a corrosion inhibitor (MC50), 1.5% of a ferric ion stabilizer (FL4-7), 0.05% of a demulsifying agent (PRJ), 1.5% of a discharge aiding agent (AD12) and the balance of water. The gelled acid can resist a temperature of 130 DEG C, and has an excellent rheological property and shearing resistance, good compatibility and filtration reduction performance and low frictional resistance; compared with common acid (20% of HCl), the acid-rock reaction speed can be reduced by 52%; under the condition of high temperature, the processing depth of the gelled acid to the stratum is enlarged, acidulating efficiency and success rate are increased, and pipe column corrosion and formation damage can be effectively reduced simultaneously, the gelled acid is prone to flowback and has a capacity of carrying solid-phase particles, the acid dissolution time of the gelling agent is short, so that field preparation is facilitated, and the gelled acid is very suitable for acid fracturing improvement of the high-temperature fractured-vuggy type carbonate reservoir.

The invention relates to a production method for high purity manganese sulfate. The production method is characterized in that pyrolusite is used as a raw material and is reduced by using a carbon fire method, then an acid is added for leaching, a vulcanizing agent is used to remove heavy metals consisting of cobalt and nickel, a fluoride is employed to remove calcium and magnesium, then filtering is carried out, ammonium bicarbonate or ammonium carbonate is added into a filtrate for deposition of manganese to realize separation of potassium and sodium, an obtained filtrate is used for recovery of the by-product ammonia sulfate for usage as an additive for metal manganese, the filter residue manganese carbonate is washed and then subjected to acid dissolution so as to obtain a manganese sulfate solution, and then crystallization is carried out to obtain a high purity manganese sulfate product, wherein mother liquor can be returned to a high purity system for reutilization. With the method provided by the invention, the high purity manganese sulfate product in which MnSO4 content is more than 99.8% and respective content of impurities consisting of Ca, Mg, K and Na is lower than 10 ppm is produced.

The invention discloses a process for processing, recycling and reusing chromic slag and waste water; the chromic slag is dissolved by acid, and then hex-valent chromium specific treating agent is added so as to thoroughly remove chromic slag pollution and extract the substance from the chromic slag to directly make the substance into other substance series product. The 'three wastes' emissions and secondary pollution are avoided in the chromic slag processing process. The chromic slag processing capacity is high, the cost is low, the rate of multipurpose utilization is high; the product obtained by the chromic slag processing and recycling process is good in quality, high in value, and the demanded amount in market is large; in this way, the process has good economic benefit and social benefit and is cable of greatly prompting the development of circular economy.

The aluminum iron chloride polymer as composite coagulant is produced with aluminum-containing material and iron-containing material and through acid dissolution, oxidation with chlorate, neutralization with calcium aluminate powder and polymerization. Compared with available technology, the present invention has the advantages of low production cost, capability of being used as drinking water purifying agent, simple usage, and wide application range.

The invention provides a recovery process for valuable metals in tungsten residues. The tungsten residue treatment method comprises the following steps of: boiling tungsten residues and 15%-25% of hydrochloric acid for acid dissolution, further adding NaF and sodium nitrate, and filtering to obtain filtrate after the end of the reaction; then extracting tungsten from the filtrate by adopting N235, and evaporating, crystallizing and drying a stripping solution to obtain APT (ammonium paratungstate); and performing alkali dissolution on filtration residues, and performing pressure filtration to directly recover Ta, Nb and Sn valuable metals. Tungsten, scandium, iron, manganese, tin, copper, tantalum and niobium valuable elements and the like in the tungsten residues can be comprehensively recovered, thus the recovery cost is reduced. The recovery process disclosed by the invention further has the advantages of good environmental benefits and low cost. According to the recovery process disclosed by the invention, the acid is adopted for dissolving the tungsten residues, the tungsten and the scandium are recovered under acid conditions, the other elements are simultaneously recovered, and the process is simple.

The invention belongs to the field of hydrometallurgy, and discloses a method for separating nickel and iron from a nickel-iron alloy and application. The method comprises the following steps: dissolving the nickel-iron alloy in an acid solution, filtering, and taking filtrate to obtain an acidic nickel-iron solution; adjusting the pH value of the acidic nickel-iron solution, heating, stirring, adding iron powder, and continuously heating and stirring to obtain sponge nickel and nickel precipitation mother liquor; enabling the nickel precipitation mother liquor to be subjected to oxidation iron precipitation to obtain ferric hydroxide slag and iron precipitation mother liquor; and dissolving sponge nickel into sulfuric acid, filtering, collecting filtrate, heating, and adjusting the pH value to obtain a nickel sulfate solution; According to the method, after the nickel-iron alloy is dissolved by using the acid liquor, nickel in the solution is replaced by iron powder to obtain sponge nickel, the nickel precipitation mother liquor is oxidized to generate ferric hydroxide, the nickel content is lower than 0.4%, the iron precipitation mother liquor can be returned to a leaching section, and the sponge nickel is subjected to acid dissolution, impurity removal and evaporative crystallization to obtain a battery-grade nickel sulfate product.

Herein is a method of segregating chemical species contained in spent nuclear reactor fuel without employing conventional acid dissolution. Particularly, pellets of spent fuel are ground to talc sized particles. Heat is added. The preferred heating is by flow through a plasma arc producing micron sized liquid drops suspended in helium flow. The vapor pressure of the chemical species is significantly greater than uranium dioxide. the ultra volatile chemical species evolve from the drops into the helium flow. The gas phase is separated from the mist by a gas/liquid separator (demister). Heavy mist drops of UO₂ impact the walls, coalesce and flow down to the separator drain, becoming legally transportable. Helium flow exhausts from the separator vertically. The gaseous chemical species will condense in sequentially cooler stages and separate from the helium down to the cryogenic temperatures of liquid radioactive xenon and krypton. Non-condensed helium is recycled.

The invention provides a metal alloy XRF spectrometry utilizing a new sample preparation technology. The technology comprises the following steps: 1) acid dissolution: dissolving a metal alloy with inorganic acid; 2) precipitation: adjusting the above dissolved sample solution to be alkaline to precipitate elements to be measured, and filtering the precipitation with ashless filter paper; 3) calcination: placing the filtered filter residues together with the filter paper in a porcelain crucible calcined to a constant weight, conversing the filter residues into metal oxides through steps of drying, carbonization, ashing, calcination, etc, and calculating a weight of calcined filter residues; 4) sheet melting: preparing the above calcined filter residues into a sample sheet by a fusion sample preparation method for detection by an XRF spectrometer, and obtaining contents of elements to be measured in the metal alloy through conversion of obtained data. The invention enables the XRF spectrometry to be applied to detections of some special metal alloys which have a high melting point, a high hardness and is easily oxidized.

The present invention relates to a preparation method for crystalloid aluminum chlorate, in particular to a preparation method for crystalloid aluminum chlorate by using the circulating fluidized bed fly ash as raw material. By means of the better chemical activity of the aluminum contained in the circulating fluidized bed fly ash, the aluminum chlorate solution is obtained from the circulating fluidized bed fly ash by a direct acid dissolution process, and then the supernatant is obtained by separating the slag from the liquid in a setting tank, and the supernatant is concentrated and crystalled, finally, the solid crystalloid aluminum chlorate is obtained after spray drying. The present invention has a wide range of raw material, a low cost, a simple manufacturing process, quality product, less energy consumption, and meets the circular economy conception.

The invention relates to a method for recycling acid in the process of producing alumina from fly ash by an acid method. The method comprises the following steps of magnetic separation and iron removal of the fly ash, acid dissolution, resin adsorption and iron removal, condensation crystallization, calcination, cooling, primary recycle of hydrogen chloride gas, secondary recycle of hydrogen chloride gas, regulation of concentration of recycled hydrochloric acid and application of the obtained hydrochloric acid to the step of acid dissolution. The method has the advantages of simple process, easily controlled production process, low production cost and recyclable adsorbed hydrogen chloride product.

The invention discloses a high-acid-dissolution-rate core material glass component for a microchannel plate. The glass component comprises 30-40wt% of B2O3, 20-30wt% of BaO, 20-30wt% of La2O3, 5-10wt% of SiO2, 1-5wt% of Al2O3, 5-10wt% of MgO and CaO and 5-10wt% of Na2O and K2O. The invention provides a new microchannel plate core glass system. The glass system is high in acid dissolution rate, has good compatibility with a microchannel slab glass system in chemical and thermal properties, and can be used for preparing a small-bore microchannel plate, a conductive glass microchannel plate and a thick bending microchannel plate.

The invention discloses a method for preparing a composite meso-porous material from coarse coal gasification slag. The method comprises the following steps: 1, taking the coarse coal gasification slag, mixing the coarse coal gasification slag with a proper amount of an acid solution to obtain a slurry, and performing an acid dissolution reaction; and 2, carrying out solid-liquid separation on a material obtained after the acid dissolution reaction, and performing washing and drying to obtain the product. The invention also discloses the composite meso-porous material prepared through the method. The carbon/silicon composite meso-porous material is obtained through controlled dissolution under mild conditions by using the high activity of silicon aluminum calcium iron in the coarse coal gasification slag. The material has the advantages of good physical and chemical adsorption performances, good ion exchange performance, simple preparation process, low cost, realization of further preparation of a water purifier from dissolved metal ions, realization of the comprehensive utilization of all components in the coal gasification slag, and realization of changing wastes into valuables.

The invention discloses a method for extracting and separating 1-deoxynojirimycin from mulberry leaves, which comprises the following steps of: pretreating a raw material, namely crushing a mulberry leaf raw material; performing enzymolysis; extracting by using alkali-alcohol, cooling, filtering to obtain extracting solution; concentrating, and performing acid dissolution and ultrafiltration to obtain ultrafiltrate; removing impurities by using cation resin, namely making the obtained ultrafiltrate pass through the cation resin, eluting by using ammonia alcohol solution, collecting eluent; making the eluent pass through macroporous adsorption resin, eluting by using ethanol solution, and collecting eluent; and concentrating the eluent, adding a methanol-saturated ammonia water mixed solvent, regulating temperature, cooling for crystallization to obtain crystals, and drying. A product with the purity of over 95 percent can be extracted and separated from the mulberry leaf raw material,and the 1-deoxynojirimycin is effectively separated; requirements on equipment are low, and the operation is safe; the process is simple, the used solvents can be recycled, and the production cost isreduced; and the used solvents are low in toxicity, environment-friendly and safe.

The invention discloses a method for recovering palladium from a waste palladium/alumina catalyst, which comprises the following steps: (1) roasting pretreatment; (2) material fine grinding; (3) acid dissolution activation by metal powder addition; (4) oxidization and dissolution of palladium; (5) vulcanization and precipitation; and (6) palladium refinement. In the step (3), the metal powder and acid react to generate H2, and the H2 reduces part of insoluble PdO in the waste catalyst into the metal Pd in the reaction process; no solid-liquid separation is needed between the step (3) and step (4), thereby implementing the palladium dissolution in one step; and the low-concentration palladium solution obtained in the step (5) is vulcanized and precipitated to obtain the high-grade palladium concentrate (palladium sulfide). The method can be used for recovering palladium from the waste palladium/alumina catalyst in petrochemical industry and fine chemical engineering industry. The recovery rate of the palladium is greater than 98%, and the purity of the palladium is 99.95%.