33 results about "Silver cyanide" patented technology

The invention discloses cyanogen-free silver-plating electroplating liquid containing an auxiliary complexing agent. The cyanogen-free silver-plating electroplating liquid containing the auxiliary complexing agent is composed of a silver ion source material, a complexing agent, the auxiliary complexing agent, a supporting electrolyte, an electroplating additive, a pH adjusting agent and the like;the components of the electroplating liquid and the contents are as follows: 30-60 g/L of silver ion source material, 140-200 g/L of complexing agent, 10-50 g/L of auxiliary complexing agent, 10-30 g/L of supporting electrolyte, 100-800 mg/L of electroplating additive and 10-30 g/L of pH adjusting agent. The cyanogen-free silver-plating electroplating liquid containing the auxiliary complexing agent provided by the invention has the advantages that: the electroplating liquid is stable and has low toxicity, the anodic passivation in the electroplating process can be better inhibited, the anodeis normally dissolved, the electroplating liquid can be continuously utilized for long time, the electroplating layer has a good bonding force and is bright, and the electroplating liquid can be applied to multiple fields including decorative electroplating, functional electroplating and the like.

The invention discloses non-cyanide bright silver electroplating bath, which consists of the following components in mass concentration: 50 to 800mg/L brightener, 25 to 60g/L silver ion source substance, 130 to 190g/L coordinating agent, 10 to 40g/L supporting electrolyte and 10 to 50g/L electroplating bath pH regulator, wherein the brightener is one or more kinds of amino acid compounds, imidazole, polyethylene glycol, quinoline derivatives and saccharin. Compared with the prior art, the non-cyanide bright silver electroplating bath has the outstanding advantages that: the electroplating bath is stable and low in toxicity; and an extremely small amount of brightener can obviously improve the performance of the electroplating bath and the quality of a coating. The coating has fine crystals, good bonding force, smooth and bright surface and high anti-tarnish property, can meet the requirement of application in multiple fields such as decorative electroplating, functional electroplatingand the like, has high practicability and can generate good economic and social benefits.

The invention relates to a technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by a full wet process, and belongs to the technical field of zinc-leached residue recycle. The technology comprises the following steps of: preparing sulfuric acid into an appropriate concentration, and performing two-stage acid leaching in an appropriate liquid-solid ratio and at a high temperature to obtain slurry; filtering and separating the slurry to obtain lead-silver residues and a zinc-containing solution; oxidizing, neutralizing and deironing the zinc-containing solution, and depositing zinc by using sodium sulphide; and eluting the lead-silver residues, blending with caustic lye at an appropriate concentration to obtain slurry at a certain concentration, reacting at a certain temperature and in a certain solid-liquid ratio, and filtering and separating to obtain a filter cake and a filtrate, wherein the filtrate is directly added with sodium sulphide for lead deposition and the filter cake returns to a silver cyaniding leaching process. The technology is short in process, simple in operation, low in cost and mild and loose in reaction conditions; an acid solution and an alkali solution at high concentrations are not required; requirements on equipment are low; the extraction rate of metal is higher than that in the conventional method; no additional waste solid, waste liquid and waste gas are discharged; the recycle of the eluate and the filtrate is realized; and environment pollution is avoided from the source.

The invention discloses a method for recovering associated sulphide copper-zinc ore from cyaniding slag of gold-silver concentrate and belongs to the technical field of flotation recovery of valuable metals in the gold smelting industry. The method comprises the steps of preparing pulp: preparing the cyaniding slag of the silver concentrate into the pulp with the concentration of 30-35% under the condition of the roughing concentration of ore flotation and injecting into a flotation machine, activating with LGY-01 as an activator for the floatation of sulphide copper-zinc ore, and obtaining copper-zinc mixed concentrate via single roughing and single scavenging by taking a combination of butyl xanthate and butylamine dithiophosphate at a weight ratio of 3:2 as a collecting agent and 2# oil as a foaming agent, wherein the activator LGY-01 is prepared from sodium pyrosulfite and sodium hydrosulfite at a weight ratio of 5:1. The method is a floatation technology for floatation recovery of the sulphide copper-zinc concentrate from the gold-silver cyaniding slag, increases a resource utilization rate, reduces environmental pollution and increases economic benefits of an enterprise.

Provided is a preparation method of metal cyanide, comprising the following steps: 1) mixing supported metal nanoparticles, a Fenton reagent and nitrile to form suspension, and then stirring, the supported metal nanoparticles being a complex wherein the supporter supports nano metal supports nano metal, nano metal oxide or nano metal salt; and 2) centrifugalizing and drying a product after stirring to obtain the metal cyanide. Also provided are the prepared metal cyanide and the use of same in the fields of sensing, batteries, medicine, electroplating and catalysis. The preparation method does not relate to highly toxic substance CN -, does not require ultraviolet light, is an entirely green method for synthesizing metal cyanide, and applies to industrial production of a large scale.

The invention discloses a nickel silvering process for replacing copper silvering in the process of electroplating an LED bracket; the nickel silvering process comprises the steps of activating, pre-silvering and silvering, wherein the mixed solution of editpotassium cyanide and potassium carbonate is adopted in the activating process; the concentrations of both editpotassium cyanide and potassium carbonate are 3-20 g/L; the mixed solution of editpotassium cyanide and silver cyanide is adopted in the pre-silvering process; the concentration of editpotassium cyanide is 120-160 g/L; the concentration of silver cyanide is 2.2-4 g/L; the mixed solution of editpotassium cyanide, silver cyanide and potassium hydroxide is adopted in the silvering process; the concentration of silver cyanide is 12-15 g/L; the concentration of editpotassium cyanide is 100-150 g/L; and the concentration of potassium hydroxide is 0.2-0.5 g/L. The nickel silvering process disclosed by the invention is simple in process; silvering is carried out after treating through the process disclosed by the invention; and the LED bracket is non-discolouring in the roasting process only by plating silver of lower thickness.

The invention belongs to the technical field of silver cyanide manufacture, and provides a silver cyanide manufacturing technology and equipment thereof. The technology comprises the steps as follows: firstly, nitric acid and silver are subjected to chemical reaction, so as to prepare a silver nitrate solution, then the silver nitrate solution and cyanide solution (such as an editpotassium cyanide solution or a sodium cyanide solution) are subjected to chemical reaction, so as to prepare silver cyanide and a nitrate solution (such as a potassium nitrate solution or a sodium nitrate solution), and finally the sodium nitrate solution are washed and separated from each other, so that the production of silver cyanide is accomplished. The technology is pollution-free, nonhazardous and low in sliver loss during the whole production process, is high in purity and good in quality of produced silver cyanide, improves the production efficiency, reduces the cost, and also realizes energy conservation and environment protection.

The invention relates to the technical field of silver cyanide drying, in particular to a silver cyanide drying method. The method comprises the following steps: 1, weighing quantitative metal silver and nitric acid through weighing equipment, then weighing quantitative water and quantitative sodium cyanide, and then respectively putting the weighed materials into respective placing containers; and 2, putting the weighed quantitative silver and nitric acid into a mixing container at the same time, completely dissolving the silver, then adding the quantitative water weighed in step 1 for dilution, adding the weighed quantitative sodium cyanide into the mixed solution after dilution, and closing a shielding cover of the mixing container after the reaction is completed. According to the device, silver cyanide is pre-crushed, the drying efficiency of the silver cyanide is improved, the phenomenon that the silver cyanide is attached to the outer sides of the containing containers and is inconvenient to clean is avoided to the maximum extent, meanwhile, waste of heat energy in the drying process is avoided to the maximum extent, and the safety of the silver cyanide during drying is guaranteed.

The present invention relates to a kind of method for removing carbonate in cyanide silver-plating bath solution, comprises a, confirms carbonate content: takes cyanide silver-plating bath solution, analyzes and determines wherein carbonate content; B, confirms precipitation agent adding Quantity: Calculate and prepare the carbonate precipitant that needs to be added according to the carbonate content in the cyanide silver plating bath; c. Carbonate precipitation: add the carbonate precipitant to the cyanide silver plating bath , stirred, allowed to stand, precipitated, filtered, and the filtrate was obtained. The invention has the advantages of high carbonate removal efficiency in cyanide silver plating bath liquid, short reaction time, more complete reaction and less potential safety hazard.

The invention relates to a method for raising leaching rate of silver cyanide and belongs to the technical field of roasting-cyaniding silver extraction production processing technology in the gold smelting and chemical industry. The method provided by the invention contains the following steps of: 1, adding complex silver ore, sal glauberi and sodium carbonate according to the mass ratio of 1: (0.02-0.03): (0.02-0.03) into a surge tank, adjusting the pulp concentration to 65-70% by the addition of water, and continuously stirring at normal temperature and normal pressure for 3-5 hours; 2) carrying out fluidized sulfating roasting on the pulp obtained from the step 1); 3) carrying out acid leaching treatment; and 4) carrying out cyanide leaching. By the adoption of the method, recovery rate of silver can be effectively raised, and utilization rate of resources and enterprise economic benefits are raised.

The invention provides a brand-new preparation method of silver potassium cyanide, which can recycle nitrate and is environment-friendly. The preparation method of the silver potassium cyanide comprises the following steps of: reacting silver nitrate with carbonate or hydroxide to generate silver carbonate or silver hydroxide, and reacting the silver carbonate or silver hydroxide with potassium cyanide to obtain the silver potassium cyanide. According to the preparation method, in the production process of the silver potassium cyanide, the production process in which silver nitrate reacts with cyanide to generate silver cyanide is omitted. Silver nitrate reacts with carbonate and other alkaline substances to generate silver carbonate precipitates (insoluble in water), meanwhile, generated nitrate and the aqueous solution do not contain cyanide, and the aqueous solution can be concentrated to recycle the nitrate so that the nitrate can be utilized as a chemical raw material. The environment is protected, resource waste is reduced, and harm to human bodies caused by harmful gas possibly generated when acidic substances are in contact with potassium cyanide in the production process of the silver potassium cyanide is eliminated.

According to the present invention, the present invention provides an electrolytic silver plating solution containing a silver cyanide complex, an electrically conductive salt, a selenium compound, asaturated fatty acid, and/or a salt thereof, and capable of forming a silver film with a high gloss and a high reflectance.

The invention belongs to the field of smelting of silver cyanide mud, and in particular relates to a method of wet extraction of silver from cyanide silver mud. The silver cyanide mud is treated through a medium-high potential wet method to be chloridized to become solid silver cyanide mud which continues to be treated by a series of steps of roasting, heating, cooling, reduction and the like to obtain elemental silver; with polyhydroxy aldehydes used for reduction, silver is quickly and efficiently reduced to the solid, and the elemental silver of high purity is obtained. The method of wet extraction of silver from the cyanide silver mud has the advantages of easy control of process conditions, simple equipment and low cost, high added value of products, high direct recovery efficiency, high safety, small environmental pollution and high economic efficiency.

The invention discloses a drying device for silver cyanide production. The drying device comprises a drying device main body, wherein fixing heads are arranged at both ends of the lower surface of thedrying device main body; supporting rods are arranged at both ends of the fixing heads; first bolts are arranged at the joints between the supporting rods and the fixing heads; sliding heads are arranged at the ends of the supporting rods; second bolts are arranged at the joints between the sliding heads and the supporting rods; threaded rods penetrates through the insides of the sliding heads; and supporting bottom plates are arranged on the lower surfaces of the threaded rods. By designing the supporting rods at both ends of the fixing heads and designing the sliding heads at the ends of the supporting rods, the problem that the height of the supporting bottom plates is inconvenient to adjust before the drying device is used, so that the drying device is unstable to place when the ground is not even is avoided, the height of the supporting rods can be changed by sliding the sliding heads on the outer surfaces of the threaded rods, so that the height of the supporting bottom plates is changed, and the problem that the drying device is unstable to place because the height of the supporting bottom plates is inconvenient to adjust is solved.

The invention discloses a recovery device for wastewater containing silver cyanide. The recovery device comprises a pretreatment system for wastewater containing silver cyanide, a first-stage membrane separation treatment system, a second-stage membrane separation treatment system and a conveying system which communicate with one another sequentially through a pipeline, wherein the first-stage membrane separation treatment system is connected with a silver recovery system through a pipeline, the pretreatment system for wastewater containing silver cyanide comprises a collection tank for wastewater containing silver cyanide, a raw water pump, a bag filter, an ultrafilter and a pretreatment water tank which communicate with one another sequentially through a pipeline, the first-stage membrane separation treatment system comprises a first-stage boosting pump, a first-stage fine filter, a first-stage high-pressure pump, a first-stage membrane separation device and a first-stage treatment water tank which communicate with one another sequentially through a pipeline, the conveying system comprises a recycling water tank and a conveying pump which communicate with each other sequentially through a pipeline, and the silver recovery system comprises a silver recovery treatment water tank, a silver recovery conveying pump and a silver recovery device. The recovery device has the advantages that the silver recovery ratio is high, and the operating cost is low.

The invention discloses an imitation gold electroplating solution which is composed of the following raw materials: 80-85 parts of cuprous sulfate, 80-90 parts of cupric chloride, 10-15 parts of sodium cyanide, 10-12 parts of ammonium thiocyanate, 8-10 parts of potassium thiocyanate, 20-30 parts of potassium cyanide, 40-45 parts of potassium auric cyanide, 8-10 parts of zinc hydroxide, 15-20 parts of barium cyanide, 20-25 parts of calcium cyanide, 15-20 parts of silver cyanide, 5-6 parts of trisodium phosphate, 5-8 parts of sodium metaphosphate, 8-10 parts of citric acid, 8-10 parts of magnesium fluoride, 8-10 parts of barium fluoride, 6-10 parts of sodium fluosilicate and 8-10 parts of aluminum fluoride. The imitation gold electroplating solution has the advantages of low cost, high electroplating performance, wide raw material sources, simple preparation process, stable performance and favorable electroplating effect.