248 results about "Silver sulfate" patented technology

An aqueous precipitation process for the preparation of particles comprising primarily silver sulfate, comprising reacting an aqueous soluble silver salt and an aqueous soluble source of inorganic sulfate ion in an agitated precipitation reactor vessel and precipitating particles comprising primarily silver sulfate, wherein the reaction and precipitation are performed in the presence of an aqueous soluble organo-sulfate or organo-sulfonate additive compound, the amount of additive being a minor molar percentage, relative to the molar amount of silver sulfate precipitated, and effective to result in precipitation of particles comprising primarily silver sulfate having a mean grain size of less than 50 micrometers.

The invention discloses a novel tetrammine palladium sulphate (II) synthesis method, comprising the following steps that: palladium chloride (PdCl2) reacts with ammonia water to generate tetraammine dichloropalladium (II); and tetraammine dichloropalladium (II) reacts with silver sulfate to generate a compound of tetrammine palladium sulphate (II). The reaction operation is simple, the reaction yield is high and more than 90%, and the purity of products is high and more than 99.0%.

An aqueous precipitation process for the preparation of particles comprising primarily silver sulfate, comprising reacting an aqueous soluble silver salt and an aqueous soluble source of inorganic sulfate ion in an agitated precipitation reactor vessel and precipitating particles comprising primarily silver sulfate, wherein the reaction and precipitation are performed in the presence of an aqueous soluble fluorinated additive, the amount of additive being a minor molar percentage, relative to the molar amount of silver sulfate precipitated, and effective to result in precipitation of particles comprising primarily silver sulfate having a mean grain-size of less than 50 micrometers.

The invention provides a processing method for waste liquid from stripping tin scolding, which comprises the following steps: in the waste liquid from stripping tin scolding, adding a chlorate for reacting, then filtering the solution, washing the filter residue by a concentrated ammonia liquor for dissolving the silver chloride sediment, recovering silver by a washing lotion to acquire pure lead chloride, extracting a filtrate by an extractant to obtain ferric iron, wherein a strip liquor is a ferric trichloride solution which can be prepared to a tin stripping liquid, adding sulfate for depositing lead and silver, wherein the reacted filter residue is a mixed sediment of lead sulphate and silver sulfate, washing by the concentrated ammonia liquor, reducing to obtain a silver powder and lead sulphate; filtering and depositing lead and silver, depositing tin and iron, filtering to obtain the sediment and dissolving by alkali, and then electrolyzing to obtain tin, electrolyzing the residual filtrate to recovery copper, and depositing palladium in the solution to obtain the sediment for recovering palladium. The processing method has reasonable and useful process flow, and performs comprehensive recovery and utilization on valuable metal in the waste liquid from stripping tin scolding, the resource waste is reduced, and the environmental pollution is reduced.

The invention discloses a preparation method of silver-copper coating powder. The preparation method comprises the following steps of: weighing 5-200 grams of copper powder, adding 10-500 milliliters of dilute acid solutions with the concentration of 1%-10%, placing into an ultrasonic stirrer, and stirring for 1-30 minutes; filtering, adding the dilute acid solutions for washing, and finally repeatedly washing the copper powder by using deionized water till washing liquid is neutral; adding the copper powder subjected to oxidation treatment to a solution with a dissolved complexing agent, placing into the ultrasonic stirrer, and stirring for 1-30 minutes to obtain a reducing solution; then adding silver sulfate to the reducing solution at the amount of 0.05-0.5 gram / minutes, and then continuously reacting for 30-60 minutes after the silver sulfate is completely added, wherein the molar ratio of the complexing agent solution to the silver sulfate solution is 2:1; adding 1-50 milliliters of ammonia water to remove the silver sulfate and the complexing agent which are remained in a reaction solution after the reaction is finished; and finally filtering the reaction solution, washing, and drying to obtain the silver-copper coating powder. The preparation method of the silver-copper coating powder, which is disclosed by the invention, simplifies the craft process, is conductive to controlling the integral reaction and ensures that a formed silver coating layer is compact.

The invention discloses a quick measuring method for mercury salt less high chlorine waste water chemical oxygen demond quantity CODcr. Its character lies in: the method uses standard potassium dichromate method, uses MnSO4 and NiSO4 to replace Ag2SO4, and checks the CODcr in water sample. The method is reliable, the energy consumption and reagent cost are saved; and because of using AgNO3 and CrK (SO4)2 to replace severe toxici HgSO4 as combined masking agent, solves the secondary contamination to environment.

The invention discloses a method for recovering four heavy metals, namely silver, mercury, iron and chromium, and a sulfuric acid from CODCr (chemical oxygen demand chromium) measurement waste liquid, and belongs to the technical field of the resource treatment of waste liquid. The method mainly comprises a technology of recovering Ag2SO4 by using a NaCl-H2SO4 method, a technology of recovering the H2SO4 by using a strongly basic anion exchange resin acid retardation principle, a technology of recovering Hg2SO4 by using a Na2S-HCl-NaOH-H2SO4 method and a technology of recovering a Fe2O3, Cr2O3 and Na2SO4 solution by using a sequential precipitation method. The method provided by the invention is simple in process and is easy to operate; the recovery rates of the silver sulfate and the mercury sulfate are high and respectively reach 80.6% and 87.8%; the recovery rate of the sulfuric acid reaches 82%; the secondary pollution cannot be caused; the product quality is good; the silver sulfate and the mercury sulfate which are recovered are both up to the standard of a commercially available reagent and can be recycled in CODCr measurement; and the recovery cost is low.

An aqueous precipitation process for the preparation of particles comprising primarily silver sulfate, comprising reacting an aqueous soluble silver salt and an aqueous soluble source of inorganic sulfate ion in an agitated precipitation reactor vessel and precipitating particles comprising primarily silver sulfate, wherein the reaction and precipitation are performed in the presence of an aqueous soluble fluorinated additive, the amount of additive being a minor molar percentage, relative to the molar amount of silver sulfate precipitated, and effective to result in precipitation of particles comprising primarily silver sulfate having a mean grain-size of less than 50 micrometers.