39results about "Copper nitrates" patented technology

A basic copper salt selected from basic copper carbonate, basic copper sulfate, basic copper acetate, basic copper citrate, and basic copper nitrate is manufactured by contacting copper metal with an aqueous solution having ammonia; an acid selected from carbonic acid, sulfuric acid, acetic acid, nitric acid, or citric acid; and oxygen, under conditions where the copper metal is converted to the basic copper salt; and then recovering the basic copper salt. The most economical embodiment is where the ammonia is present in the aqueous solution is in an amount between about 6.7 g/l and about 15 g/l calculated as NH₃, and the pH of the composition is between 8 and 10, and the temperature of the composition is between 25° C. and 100° C. The method is particularly useful if the basic copper salt is basic copper carbonate. The basic copper carbonate produced has the formula: (CuCO₃)_x(Cu(OH₂)_y, where y is 1 and x is between 0.1 to less than 1; or where y is 1 and x is 1, or where y is 1 and x is between 0.5 to less than about 0.95, or where y is 1 and x greater than 1.

The invention discloses a comprehensive utilization method of waste liquor in the production of basic cupric carbonate and relates to the field of treatment methods of industrial wastewater. The invention aims at providing a comprehensive utilization method of waste liquor in the production of basic cupric carbonate, and in particular relates to a method for reusing sodium bicarbonate in the waste liquor. The waste liquor in the production of the basic cupric carbonate is the waste liquor generated after the basic cupric carbonate is produced by a reaction between an acidic copper chloride solution or an acidic copper sulfate solution and a sodium carbonate solution. The comprehensive utilization method of the waste liquor in the production of the basic cupric carbonate mainly comprises the following steps: adding a little distilled water into a reaction kettle as a base solution; when the reaction temperature rises to 35-90 DEG C, starting a stirring device, and adding the waste liquor containing sulfate radicals or chlorine and the acidic copper solution into the reaction kettle for reaction, wherein the pH value during the addition of the solutions is controlled to be 3-6; and filtering, washing, drying and sieving reaction products to obtain the basic copper salt. The method disclosed by the invention is simple to operate, easy to control reaction conditions, and widely applicable to the recycling and reusing of the waste liquor in the production of basic cupric carbonate.

The invention discloses a technology for extracting copper from copper ammonia wastewater through an ion exchange method. The technology comprises the following steps: firstly regulating the PH value of the wastewater to 2-3 to enable copper in the wastewater to exist in form of ions, simultaneously settling silicon ions and ferric ions in the wastewater, using a copper resin column to adsorb copper ions in the wastewater after impurities in the wastewater are removed, using nitric acid with weight in weight (w/w) of 8-15 percent for regeneration, and centrifugally separating the regenerated concentrated solution to obtain copper nitrate trihydrate. The technology for extracting copper from copper ammonia wastewater through the ion exchange method can be used for directly extracting copper ions from the wastewater. Since the system adopts online detection and automatic control, the wastewater emission is effectively ensured to satisfy the standard. The content of copper in the wastewater treated by using the technology of the invention is less than 0.5mg/l, the metal recovery rate can reach 99.5 percent and the purity of the recovered copper can reach 99 percent. Compared with a traditional ion exchange system, the invention has the advantages that the operation of the technology is simple, the operation cost is low, the high-purity copper nitrate can be obtained and the steam consumption is decreased by more than one time.

A basic metal nitrate suitable as an oxidizing agent for a gas generating agent, which is a basic metal nitrate having a good thermal stability and meeting at least one requirement of the following (a) to (d): (a) a particle diameter of 0.5 to 40 μm; (b) a degree of crystallinity having 0.4 deg or less of a half band width of the peak in the X-ray analysis; (c) an initiation temperature of weight loss being 220° C. or higher according to TG-DTA analysis; and (d) an impurity content of 1,000 ppm or less based on Na atom. Also, a gas generating composition which has a low toxicity, a high burning rate, and a low combustion temperature and which is used in a gas generator for an air bag. The gas generating composition comprises (a) tetrazole derivatives, guanidine derivatives or a mixture thereof, (b) a basic metal nitrate, and (c) a binder and/or a slag-forming agent.

The invention discloses a clean method for preparing an electronic grade high-purity copper nitrate solution. The method comprises the following steps: after injecting dilute nitric acid into a reactor which resists the erosion of nitric acid, putting a superfluous electrolytic metallic copper plate into the reactor, stirring after dissolution reaction began, adding thicker hydrogen peroxide and thicker nitric acid, and carrying out solid-liquid separation after finishing the reaction to obtain the copper nitrate solution. The method has simple operation and no nitrogen oxide pollution.

The invention discloses a preparation method for basic copper nitrate, and the method is characterized by comprising the following steps of: preparing a solution A containing Cu<2+> and NO3<-> in a first reactor; preparing a solution B containing NH4<+> and OH<-> in a second reactor; enabling the solution A and the solution B to flow into a third reactor simultaneously, reacting in a water phase, adjusting the flow rates of the solution A and the solution B to cause the pH value of the reaction solution in the third reactor to be 3-10, and then preparing an intermediate product; transferring the intermediate product in a fourth reactor, washing until a washing solution is neutral, and then performing primary dewatering treatment to prepare a primary product; performing a series of subsequent treatments such as dehydration on the primary product in a fifth reactor, and then preparing a target product, namely basic copper nitrate. The preparation method for basic copper nitrate is increased in production efficiency by using the raw materials which are low in price and easy to get, simple equipment and simple technological processes, good and stable in product quality, and good in social and economic benefits.

The invention provides a recycling method of electroplating wastewater containing copper nitrate and relates to the field of treatment methods of electroplating wastewater, aiming at providing a treatment method of electroplating wastewater containing copper nitrate, which is low in treatment cost, simple to operate, wide in application range, diversified in recycled products and relatively high in added value of products. The method mainly comprises the following steps: adding a small amount of distilled water into a reaction kettle to serve as base solution, starting a stirring device when the reaction temperature rises to 35-90 DEG C, adding the pre-treated electroplating wastewater containing copper nitrate and calcium oxide, calcium carbonate or calcium hydroxide slurry into the reaction kettle to react, filtering, washing, drying and sieving the reaction product to obtain an alkali type copper nitrate product, and carrying out concentration evaporating and crystallizing the filtrate to prepare a calcium nitrate product. The treatment method provided by the invention has the advantages that process flow is short, operation conditions are easily controlled, the method has safe and environment-friendly function, applicable treatment concentration range of electroplating wastewater containing copper nitrate is wide, and the method is particularly suitable for recycling copper in copper nitrate wastewater for small and medium enterprises.

Disclosed is a process for removing metals from waste, particularly electronic waste (or “e-waste”). The process generally includes the steps of dissolving at least some of the metals from the waste with nitric acid reagent and then causing at least some of the metals to precipitate as metal oxides and/or metal nitrates. NOx gases produced as by-product by the nitric acid dissolution of metallic components in the electronic waste are reused, in particular for generating permanganate when one of the metallic components comprises manganese.

The invention provides a method for preparing a cupric nitrate solution, which comprises the following steps: putting metal copper inside a pressure-proof and nitric acid corrosion-resistant container, and introducing industrial pure oxygen to perform the dissolving reaction of metal copper at a reaction temperature of between 20 100 DEG C and 100 DEG C with a reaction pressure between 0.05 MPa and 0.5 MPa. The nitric acid for reaction is between 1 mol/L and 14 mol/L. The amount of copper for reaction is larger than the amount calculated by the chemical equation and the reaction lasts for 1 to 10 hours.

A process in which a basic metal nitrate is obtained in a high yield is provided. A process for producing a basic metal nitrate, which comprises adding an aqueous solution of a metal nitrate or an aqueous solution of a mixture of a metal nitrate and a water-soluble additive and an alkali solution to a reaction vessel in which a reaction solvent whose pH at 20° C. is adjusted to 6 or less is present, and conducting the reaction with stirring.

A preparation method of superfine basic copper nitrate for a gas generator comprises the steps: 1, preparing aqueous solutions of cupric nitrate trihydrate and sodium hydroxide; 2, adding the sodium hydroxide aqueous solution and an additive into a reaction kettle, uniformly adding the copper nitrate aqueous solution into the reaction kettle within 0.5 h, controlling the pH value of the reaction solution of 7.5-9.0, and with the temperature of 60-90 DEG C, carrying out a reaction for 0.5-3 h; 3, carrying out filtration of a precipitation, retaining a mother liquor, adding water into the precipitation, pumping the suspension of the precipitation into a spray dryer for spray drying, and then packaging; and 4, pumping the mother liquor into a vacuum evaporator, carrying out reduced pressure evaporation, carrying out cooling crystallization, filtering, and drying the crystals for package. The crude product which can prevent aggregation or can prolong the time required to aggregate is obtained, and the steps of centrifugally spin-drying and multiple-time washing, levigating by a coarse powder machine and further crushing by an airflow crusher are omitted, so that the time is saved, the equipment investment is saved, moreover, the energy consumption and environmental pollutions are also reduced, the cost of the product is reduced, and the product can reach a same granularity level by a traditional process.

The invention relates to a method for resource treatment by using a nitric acid stripping liquid, and in particular relates to a method for preparing copper nitrate from the nitric acid stripping liquid. The method for preparing the copper nitrate by using the nitric acid stripping liquid is characterized by comprising the following steps: (1) performing leaching: using the nitric acid stripping liquid as a leaching solvent, adding a copper-containing electronic material for leaching, and after a leaching reaction is finished, performing solid-liquid separation to obtain a leaching liquid andtin slag; (2) removing lead: adding dilute sulfuric acid to the leaching liquid for removing the lead, and performing solid-liquid separation to obtain a copper nitrate solution and a lead sulfate precipitate; and (3) performing crystallization: performing crystallization on the copper nitrate solution to obtain industrial-grade copper nitrate. The method provided by the invention adopts the nitric acid stripping liquid and the copper-containing electronic material as raw materials to realize the resource recovery of tin and the lead, so as to obtain the tin slag and industrial-grade lead sulfate, and then crystallization purification is performed on the copper nitrate solution to obtain the industrial-grade copper nitrate. The method provided by the invention is simple in process, saves energy, protects environments, has high added value, and achieves the effects of turning waste into treasure and promoting resource benefits.

The present invention relates to the field of preparation methods for inorganic compounds, in particular to a preparation method for spectrograde copper nitrate. The invention is characterized by reacting nitric acid with electrolytic copper; introducing hydrogen sulfide gas to produce sulfide precipitates so as to remove metal cations; recrystallizing the copper nitrate to obtain spectrograde copper nitrate. The spectrograde copper nitrate prepared by the present invention has high purity and low impurity content, and the preparation process has easy steps and high benefits.

The invention discloses a preparation method of basic copper nitrate, which comprises the following steps: (1) reacting an aqueous solution of copper nitrate with an aqueous solution of amine compounds at 0-40°C; The reaction mixture is allowed to stand at 10-70°C; (3) filter, wash and dry the filter cake. Wherein, the amine compound is a compound in which one or more hydrogen atoms in the hydrocarbon compound molecule are replaced by -NH2. The preparation method of the invention has the advantages of simple process, short process, mild conditions, high yield, low cost and stable product properties, and the regulation and control of the morphology and particle size of the basic copper nitrate can also be realized by controlling the condition parameters.

The invention discloses a method for preparing alkali type copper nitrate ultrafine powder with a microwave hydrothermal method. The method comprises the steps that a copper nitrate water solution is prepared and injected into a reaction kettle with a polytetrafluoroethylene lining, the reaction kettle is placed into a microwave hydrothermal device to be heated, a sodium hydroxide or potassium hydroxide water solution is dropwise added to adjust the reaction liquid pH, the precipitate is immersed with a dilute nitric acid water solution and stirred and washed, a solid is placed into a dryer to be dried to obtain the alkali type copper nitrate ultrafine powder, and the production cost can be reduced with the method.

The invention discloses a waste acid recovery system, which comprises a waste acid pre-rectification device (1), the waste acid pre-rectification device (1) is connected with a phosphoric acid pre-rectification device (4); and the phosphoric acid pre-rectification device (4) is communicated with a post-treatment device (9). Resourceful, harmless and cyclic comprehensive utilization of waste acid is realized; poisonous and harmful substances in the waste acid are recycled, valuable components are recovered and made into phosphoric acid, acetic acid and copper nitrate; phosphoric acid, acetic acid and copper nitrate can be directly sold as chemical raw materials, returned to the market again and utilized; generated calcium fluoride and calcium sulfate are treated as general waste, and generated waste gas is treated by an environment protection device and then discharged after reaching the standards.

The invention belongs to the technical field of comprehensive use of waste lead slag from manufacturing of inorganic chemical lithopone, in particular to a method for producing cadmium nitrate and copper nitrate in preparation of cast iron ingots by arc process mixed iron slag. The invention adopts a main technical scheme that: an arc furnace technique is used to extract the heavy metal from the lithopone waste slag; the waste slag is subjected high-temperature treatment, acidic treatment and distillation treatment; and thus, monomer iron, copper and cadmium and valuable compounds thereof are prepared. The method can remove heavy metal slag completely and reduces the pollution of the heavy metal to environment. The method can prepare valuable products and can create great social and economic benefit.