36results about How to "Achieving Recovery" patented technology

The invention belongs to the wet-process metallurgical field and in particular relates to a method for preparing titanium slag by wet-processing on vanadium-titanium magnetite concentrates. The method for preparing titanium slag by wet-processing on vanadium-titanium magnetite concentrates comprises the following steps of: (1), mixing the vanadium-titanium magnetite concentrates with an hydrochloric acid solution to obtain intermediate sizing agent; (2), filtering the intermediate sizing agent obtained in the step (1) to obtain leaching slag and carrying out secondary water-washing on the leaching slag (3), neutralizing the water-washing slag obtained in the step (2) by using a diluted alkaline solution, and filtering the neutralized sizing agent to obtain neutralized slag; (4), mixing the neutralized slag obtained in the step (3) with a NaOH solution to carry out alkaline-washing desilicication reaction; (5), filtering the product obtained by the alkaline-washing desilicication reaction, and carrying out water-washing on the obtained alkaline-washed slag; and (6), carrying out acid-pickling on the water-washed slag obtained by the water-washing in the step (5), filtering after the acid-pickling, drying and filtering the slag to obtain the titanium slag. The method for preparing titanium slag by wet-processing on vanadium-titanium magnetite concentrates has the advantages of being short in process, gentle in operation condition, low in device investment and the like.

The invention discloses a method for producing potassium sulfate from potassium/chlorine-ion-containing solid waste, which comprises the following steps: leaching potassium/chlorine-ion-containing solid waste with water, wherein the potassium/chlorine ions and other soluble impurity ions enter the water to form a potassium-chloride-containing mixed solution; adding an alkaline matter into the mixed solution to regulate the pH value of the solution, thereby performing primary impurity removal; adding soluble carbonate into the solution to perform secondary impurity removal; carrying out solid-liquid separation; adding ammonium sulfate into the filtrate; after the sulfating reaction, adding alcohol to precipitate potassium sulfate; after the potassium sulfate precipitation reaction, carrying out solid-liquid separation; drying the filter residue to obtain the potassium sulfate product; adding the filtrate into a concentration and crystallization device to perform concentration and crystallization, and carrying out solid-liquid separation, wherein the filter residue is the potassium-containing ammonium chloride product. By using the method, the recovery rate of K2O in the product is not less than 91% in the potassium-chloride-containing mixed solution.

The invention discloses a method and device for removing and recycling nitrogen and phosphorus in biogas slurry. The combined technology of struvite crystallizing, ammonia stripping, SBBR treating and BAF treating is adopted to treat and use the biogas slurry in a resource mode, nitrogen and phosphorus in the biogas slurry are converted into struvite and ammonium sulfate capable of being used as fertilizer, while it is ensured that the treated biogas slurry reaches the emission standard of livestock and poultry industry pollutants, nitrogen and phosphorus recycling is achieved, operation cost of traditional biogas slurry treatment is effectively reduced, and the method has the advantages of being stable in treatment effect and the like. The device is designed based on the method, all parts of the device are optimized and improved, and the device can continuously and stably operate and is convenient to use and popularize.

The invention relates to the technical field of pressure swing adsorption decarburization and discloses a novel saturation adsorption process of pressure swing adsorption decarburization and a device thereof. According to the process, CO2 gas in raw gas is adsorbed and removed by adsorbents in adsorption towers which are arranged in parallel, so as to obtain purified gas. Each circulation of the process comprises adsorption, uniform pressure drop, recycling, vacuumization, uniform pressure rise, isolation and final boosting, wherein the adsorption includes front adsorption, adsorption and back adsorption; the front adsorption specifically comprises the steps of inputting the output gas at the stage of the back adsorption of other adsorption towers and outputting the purified gas; the adsorption specifically comprises the steps of inputting the raw gas and outputting the purified gas; the back adsorption specifically comprises the step of outputting gas which exceeds the indexes of the purified gas, so as to be used as the input gas of the front adsorption or the final inflated gas of the final boosting; the final boosting comprises the step of boosting the adsorption tower by adopting the gas which exceeds the indexes of the purified gas and is output by the back adsorption of other adsorption towers. The novel saturation adsorption process has the advantages of high CO2 absorptivity, less loss of effective constituents in the gas and the like.

The invention discloses a recovery method of slurry, which is used for recovering polyoxyalkylene and carborundum powder in the slurry. The recovery method comprises the following steps that the density of initial slurry is adjusted to obtain pretreated slurry; the pretreated slurry is subjected to primary fractionation to obtain carborundum and first suspension liquid; the first suspension liquid is subjected to secondary fractionation to obtain the carborundum and second suspension liquid; the second suspension liquid is filtered to obtain the polyoxyalkylene and filter residues; and the filter residues are subjected to off-line separation to obtain the polyoxyalkylene and the filter residues. According to the recovery method, as the first suspension liquid obtained after the primary fractionation is subjected to the secondary fractionation, the recovery rate of the carborundum is increased. As the second suspension liquid after the secondary fractionation is filtered, the suspension liquid is further recovered; and the filter residues after the secondary fractionation is further recovered. Therefore, with the adoption of the recovery method, the recovery rate is increased greatly.

The invention provides a method for rapidly determining the content of mercaptoacetic acid. The method comprises the following steps: oxidizing sulfydryl by iodine under an alkaline condition; limiting the reaction speed through IO3<->generated by reaction; and determining the titration end point to obtain the content of mercaptoacetic acid. According to the method for rapidly determining the content of mercaptoacetic acid, the recovery rate of a mercaptoacetic acid titration method reaches 98%; meanwhile, the method is stable.

The invention discloses a method for determining naringin and denatonium benzoate serving as bitterants in finger painting inkpad for children by ultra-high performance liquid chromatography. According to the method, two bitterants in a sample of the finger painting inkpad of children are extracted in an ultrasonic extracting mode by taking methyl alcohol-0.02 mol/L KH2PO4 (30:70, v/v) as a solvent; and the two bitterants are quantified through an external standard method and are analyzed through the UPLC. The linear ranges of the naringin and the denatonium benzoate are both 0.1 to 5 mg/L (R2is greater than or equal to 0.99), and the detection limits (S/N>3) are respectively 0.75 and 1.15 mg/kg. The mark recovery rate ranges of the naringin and the denatonium benzoate in the finger painting inkpad for the children at three concentration levels are 86.7 to 108.4 percent; and the relative standard deviation (RSD, n=6) is less than 5.0 percent.

The invention discloses a method for enriching silver ions in a protein-containing biological matrix, a quantitative kit and a detection method. The method for enriching the silver ions comprises thefollowing steps: S1, adding a nitric acid solution I into a biological matrix sample to enable the pH value of the system to be 4.0-6.5; S2, adding a nitric acid solution II to enable the pH value ofthe system to be 1.0-3.0, wherein the concentrations of the nitric acid solution I and the nitric acid solution II are respectively 0.5%-2.0%; the volume of the biological matrix sample is greater than that of the nitric acid solution I; and the volume of the biological matrix sample is smaller than that of the nitric acid solution II. The silver ion quantitative kit comprises the nitric acid solution I, the nitric acid solution II, a protein solution, a silver standard substance, a silver quality control substance and an indium internal standard substance, wherein the concentrations of the nitric acid solution I and the nitric acid solution II are respectively 0.5%-2.0%.

The invention provides a zero-discharge process and system for wastewater reuse in the integrated circuit industry. The zero-discharge process is characterized in that wastewater is sequentially subjected to oxidation adsorption, secondary physicochemical precipitation, ultrafiltration, four-section membrane concentration, secondary purification treatment and concentrated liquor evaporation treatment. According to the invention, the effect that the recovery rate can be not lower than 96% is achieved in a multi-section concentration and high-low combination mode. Considering the need for equipment maintenance, the recovery rate of not lower than 90% can still be achieved under the condition that part of equipment is adopted for bypass maintenance, namely, a one-stop-three-use condition.

The invention relates to a multi-disc direct cleaning filter and a use method of the multi-disc direct cleaning filter, relates to the field of filtering of industrial sewage and papermaking white water, and particularly relates to the multi-disc direct cleaning filter and the use method of the multi-disc direct cleaning filter. The multi-disc direct cleaning filter comprises a housing and a support frame arranged in the housing, wherein a white water inlet pipe is arranged at the upper part of one side surface of the housing, a drain pipe is arranged at the lower part of the other side surface, corresponding to the one side surface, of the housing, and a plurality of mutually parallel support frames are arranged between the white water inlet pipe and the drain pipe. Aiming at the papermaking one-machine platform, the multi-disc direct cleaning filter is a piece of novel equipment developed to recycle the white water and the fiber, the equipment achieves the fiber recovery rate of morethan 99.5% by using a metal fiber filter disc, almost no fiber is lost, the clarity of a super clear filtrate is up to more than 99%, and the content of suspended solids in the super clear filtrate is less than 20 mg/L. The multi-disc direct cleaning filter avoids the problem that the vacuum water leg is formed badly because of insufficient filtrate water caused by the number of discs and the blockage of meshes of a filter screen of the traditional multi-disc, and also solves the problems that a filter cake is thin, is poor in dryness and is difficult to peel because of the small vacuum suction force.