14 results about "Low copper" patented technology

The invention discloses a process for extracting copper from low-copper-content waste liquid and treating wastewater, and relates to the field of circuit board production waste liquid treatment.The process sequentially comprises the specific steps of waste liquid mixing, electrolytic additive adding, circulating mixing, electrolytic copper extraction, copper ion concentration detection and wastewater treatment. Meanwhile, the equipment universality is high, copper-containing complexes can be degraded, up-to-standard discharge of wastewater can be easily achieved, elemental copper generated in the electrolysis process has certain economic benefits, and the method is suitable for application and popularization.

The invention discloses a tin-copper series high-temperature antioxidant solder with low copper corrosion rate, which comprises the following components in percentage by mass: 1.2-2.5% of Cu, 0.1-1.2% of Bi, 0.03-0.15% of alloy element X and the balance of Sn, X is one or more of Ni, Nd, As, P and Ga, and in the alloy element X, the content of Ni is 0.02-0.1%, the total content of Nd and As is 0.01-0.02%, and the total content of P and Ga is 0.005-0.025%. The solder has low copper corrosion rate, high oxidation resistance and high strength, and the copper corrosion rate at 360 DEG C is reduced by 26.4%-58.7% compared with SnCu 0.7; the liquid surface is kept bright for 40-70 seconds at the temperature of 400 DEG C, and the oxidizing slag rate is only 1%-2.5%; the Brinell hardness is improved by 4.8%-65.3% at the room temperature, the tensile strength is improved by 8.5%-59.4%, and the alloy is particularly suitable for dip soldering and wave soldering scenes with the high welding temperature.

The present invention relates to a chemical mechanical polishing composition comprising (a) 0.1 to 20 wt% of abrasive particles; (b) 10 to 500 ppm of NH4 < + > and / or NH3 molecules, wherein the NH4 < + > and / or NH3 molecules are selected from one or more combinations of any substances containing the NH4 < + > and / or NH3 molecules; (c) a complexing agent, wherein the complexing agent is selected from one or a combination of more of organic acid compounds or amino acid compounds; (d) water; the chemical mechanical polishing composition comprises double oxidation potentials on the surface of copper after being in contact with the copper, the double oxidation potentials comprise a first copper oxidation potential and a second copper oxidation potential, the first copper oxidation potential is less than 0V and the second copper oxidation potential is between 0.005 V and 0.40 V relative to a reference electrode Ag / AgCl potential; the chemical mechanical polishing composition can achieve higher copper removal rates, lower copper surface roughness, and lower butterfly recesses, as well as improve the selectivity of copper relative to low dielectric materials.

The application discloses a low copper loss double-side blown bath smelting method and belongs to the technical field of copper pyrogenic smelting. The method constructs a vertical oxygen potential gradient in the same smelting furnace: 70%-85% of oxygen-rich air is blown into the tuyere at the lower part of the furnace body to form a strong oxidation smelting zone; and a reducing medium such as natural gas or pulverized coal is sprayed into the slag layer at the upper part of the furnace body to form a weak reduction clarification zone. The amount of the reducing medium sprayed is dynamically adjusted by on-line monitoring of the CO content in the flue gas or the Fe3O4 content in the slag, and the Fe3O4 content in the slag is controlled to be 3%-6%. The method efficiently reduces Fe3O4 in the slag into FeO, significantly reduces the viscosity of the molten slag, and improves the slag-ice-copper separation condition, so that the copper content in the discarded slag is stably reduced from more than 1.8% in the conventional method to less than 1.3%, and the metal recovery rate is improved. Meanwhile, the method realizes integration of smelting and tempering, simplifies the process, reduces energy consumption, and enhances the adaptability to complex raw materials.

A cylinder head valve seat (10) of a motor vehicle, comprising: a valve seat (24) having a valve seat surface (26) integrally connected to an engagement end (28); and the engaging end (28) includes a plurality of materials extending through a cross-section of the engaging end (28), wherein the plurality of materials comprise at least two materials with different thermal conductivities, wherein the plurality of materials comprise a first material (30) having a copper content defining a high thermal conductivity, wherein the copper content of the first material (30) has a low copper content, which defines a copper content of less than about 50%, wherein the plurality of materials comprise a second material (32) having a high copper content, defining a copper content of greater than or equal to 90%, and wherein the first material (30) merges into the second material (32), wherein the valve seat (24) has a plurality of male engagement features extending from an engagement end, wherein the plurality of male engagement features comprise a plurality of first male elements (34) extending from a first contact surface of the engagement end and a plurality of second male elements (38) extending from a second contact surface of the engagement end, wherein the first male elements (34) and the second male elements (38) define dovetail-shaped elements.

This invention relates to a method for the synergistic separation of iron and copper-zinc in zinc sulfate solution using ultrasonic-enhanced goethite, belonging to the field of hydrometallurgical technology. This invention separates iron and copper-zinc from zinc sulfate solution containing Fe. 2+ Cu 2+ and Zn 2+ An acidic zinc sulfate solution was placed in an ultrasonic field, and an oxidant was slowly added to pre-oxidize the solution until Fe was added. 3+ A pre-oxidized acidic zinc sulfate solution with a concentration of 0.01~1.00 g / L was obtained. Goethite seed crystals and a copper-zinc liquid phase stabilizer were added to the pre-oxidized acidic zinc sulfate solution and mixed evenly. A neutralizing agent was added under ultrasonic conditions to adjust and control the pH of the solution system to 2.5~4.0, and the reaction proceeded. This caused the iron in the solution system to form a goethite precursor and directionally crystallize into α-FeOOH. At a pH of 2.5~4.0, the ultrasonic density was adjusted to promote the directional crystallization of Fe until the Fe concentration in the solution did not exceed 0.1 g / L. This allowed the directionally crystallized α-FeOOH particles in the solution system to grow in an orderly manner and inhibited disordered flocculation and agglomeration. Solid-liquid separation yielded a goethite precipitate with low copper and zinc entrainment and a copper-zinc enriched purification solution. This invention can achieve efficient removal of iron and low loss retention of copper and zinc.

The invention discloses an antibacterial high-entropy alloy with low copper content, a preparation method and application, and belongs to the technical field of metal materials, the chemical formula of the antibacterial high-entropy alloy is AlxCoyCrCuzFeNiSi0.2, x is more than or equal to 0.3 and less than or equal to 0.6, y is more than or equal to 1.0 and less than or equal to 1.5, and z is more than or equal to 0.05 and less than or equal to 0.3; the microstructure of the antibacterial high-entropy alloy is of a two-phase structure and comprises a dendritic phase rich in Cr and Fe and an interdendritic phase rich in Al and Ni. The yield strength of the antibacterial high-entropy alloy is 751 MPa, the limit compressive strain is 40%-42%, and the passivation interval is 0.5 V. The antibacterial high-entropy alloy has excellent corrosion resistance, ions such as Al, Co, Ni and Cu can be dissolved out when the alloy is corroded by bacteria, splitting of the bacteria is inhibited under leading of the Co ions, and the antibacterial rate of 96%-98% on escherichia coli in one day and 100% on escherichia coli in three days is achieved; when no bacterial corrosion exists, a compact oxidation film is rapidly generated on the surface, and release of harmful ions is inhibited. The method has great research value and significance in the aspects of biomedicine, food processing, living home, national important engineering equipment and the like.

The invention discloses a copper-manganese alloy plate strip with ultralow copper thermal electromotive force and a preparation method of the copper-manganese alloy plate strip, and belongs to the technical field of non-ferrous metal smelting and rolling machining. The copper-manganese alloy plate strip comprises the following raw materials in percentage by mass: 11.0%-13.0% of Mn, 2.0%-3.0% of Ni, 0.1%-1% of Ce, 0.5%-1.5% of Nd, less than or equal to 0.25% of Si, 0.25%-0.5% of Fe and the balance of Cu; wherein the mass ratio of Ce to Nd is (0.07-2): 1, and alloy grains can be refined to 5-10 [mu] m. The preparation method comprises the following steps: sequentially performing casting, forging, hot rolling and solid solution heat treatment on raw materials to obtain a hot-rolled coil; carrying out surface milling, rough rolling, first annealing and medium finish rolling treatment to obtain a medium finish rolling plate strip; and finally, carrying out secondary annealing, finish rolling, withdrawal and straightening and finished product annealing treatment to obtain a copper-manganese alloy finished product plate strip. Through the unique rare earth element ratio and strict process control, the alloy plate strip with fine grains and uniform structure is obtained, the thermoelectric force of the alloy plate strip to copper is remarkably reduced, the performance is stable, and the high requirements of the fields of precision resistors and the like are met.

The invention discloses a secondary copper surface coating removal method, which relates to the field of recycling of renewable resources and comprises the steps of plasma treatment, electrolytic removal, ultrasonic treatment, enzymolysis and purification. The coating removal rate is high, the removal rate of paint, plastic, oxide layers and other coatings through the multi-phase synergistic technology is larger than or equal to 99%, the residual rate is smaller than or equal to 0.5% and is increased by 15%-20% compared with a traditional method, and the problem that follow-up processing is affected by coating residues is thoroughly solved; and the copper loss rate is low, specifically, the copper loss rate is smaller than or equal to 0.5% through corrosion inhibitor adding and weak acid pickling control, the copper loss rate is reduced by 60%-70% compared with a high-temperature incineration and strong acid soaking method, and the copper loss is reduced by 50-150 tons per year according to 10,000 tons of treatment per year.

The invention discloses a compound for inhibiting copper corrosion, which comprises a nitrogen-containing compound a, a nitrogen-containing compound b and a surfactant, the structures of the nitrogen-containing compound a and the nitrogen-containing compound b are as follows: # imgabs0 #; the surfactant comprises one or a combination of more of methoxypolyethylene glycol, polyamine ether, polyoxyethylene alkylamine and polyvinylpyrrolidone, and the HLB (Hydrophile-Lipophile Balance) value of the surfactant is 18-20; the molar ratio of the nitrogen-containing compound a to the nitrogen-containing compound b is (1: 1)-(1: 5), and the molar ratio of the nitrogen-containing compound a to the surfactant is (1: 1)-(1: 3). The complex agent can effectively inhibit corrosion of copper, the polishing composition containing the complex agent can also inhibit corrosion of copper, the low copper removal rate is guaranteed, meanwhile, the polishing rate of a barrier layer is increased, the occurrence of dish-shaped defects is reduced, copper and the surrounding barrier layer are completely flattened, and the corrosion resistance of copper is improved. And improvement of device contact interconnection performance and improvement of integrated circuit density are facilitated.

The invention belongs to the field of copper smelting, and particularly relates to a pretreatment method of copper anode slime, which comprises the following steps: settling slurry obtained by cleaning an electrolytic bath after copper electrolysis, removing supernate to obtain anode thick slurry, washing the anode thick slurry by using impurity removal final liquid produced by an electrolytic waste liquid treatment system, and carrying out solid-liquid separation on the washed slurry to obtain the anode slime, and the anode slime is transferred to a smelting course to be subjected to sulfuric acid oxygen pressure leaching copper removal treatment. According to the scheme, copper in the anode thick slurry is dissolved out by utilizing the characteristics of high acid and low copper of the impurity removal final liquid, the copper content in the anode thick slurry is reduced, and after the anode mud is obtained through solid-liquid separation, the copper content of the anode mud is reduced to 15% or below, so that the copper removal pressure of sulfuric acid oxygen pressure leaching copper removal in a smelting course is greatly reduced; the copper removal cost of the process is reduced, the copper removal efficiency is improved, the intermediate waste liquid in the electrolysis process is further utilized, and the copper direct recovery rate in the electrolysis process is also improved.

The invention relates to a method for treating semi-autogenous grinding hard rock through dump leaching of low-copper raffinate, and solves the problems of power consumption increase, treatment capacity reduction and cost increase caused by the fact that returned hard rock occupies part of the treatment capacity of a semi-autogenous grinding machine in an existing method. The method comprises the following steps: 1) crushing the copper oxide cobalt ore, grinding the crushed copper oxide cobalt ore in a semi-autogenous mill, leaching screen underflow for H2SO4 acid leaching, and extracting a low-copper solution generated after CCD (Charge Coupled Device) washing after leaching to generate low-copper raffinate; (2) the hard rock is transferred to a dump leaching site to be stacked, then low-copper raffinate is used for conducting spraying leaching on the hard rock, and copper-cobalt leaching liquid obtained after leaching is mixed with the low-copper raffinate to conduct repeated spraying leaching on the hard rock heap; 3, a part of the low-copper raffinate enters a thickener to remove iron, a part of the low-copper raffinate is mixed with dump leaching liquid, and hard rock dump leaching is performed with spraying leached, and 4, a part of the hard rock leaching liquid enters the thickener to remove iron, a part of the hard rock leaching liquid is mixed with the low-copper raffinate, and hard rock dump leaching is performed with spraying leached.

The invention discloses a method for enriching copper from a copper smelting waste acid stock solution, and belongs to the technical field of nonferrous metallurgy and environmental engineering. The method aims at solving the problems that in the prior art, copper and arsenic are not thoroughly separated, the copper resource recovery rate is low, and arsenic is cyclically accumulated in a system, and the method comprises the core steps that firstly, preliminary vulcanization is conducted, arsenic slag slurry is generated, then arsenic slag and fresh waste acid are subjected to a cyclic reaction, copper ions are selectively precipitated and enriched in the arsenic slag, and the arsenic slag is recycled. And finally, carrying out deep vulcanization on the separated liquid to obtain the low-copper arsenic slag. According to the method, complex activation equipment and accurate metering are not needed, operation is easy and convenient, copper resources can be efficiently recycled, arsenic is effectively removed, and high-value utilization of valuable metal in waste acid and cooperative control over environmental pollution are achieved.

This invention belongs to the field of waste gas treatment and discloses a tail gas purification device for antimony crystallization salt reaction of crude antimony alloy with low copper content. The device consists of an inlet pipe, a filter chamber, a blade cylinder, a transition pipe, and an exhaust pipe connected in sequence. In use, the invention achieves dynamic self-adaptation between the amount of reagent fed and the tail gas flow through the rotation of the spiral blades, effectively avoiding the waste of excessive reagent or insufficient reagent that leads to substandard purification. At the same time, the transmission component and the flow guiding component in the transition pipe cooperate to realize the continuous reciprocating non-fully closed opening and closing of the flow guiding plate. This not only creates continuous disturbance to the gas-pharmaceutical mixed airflow, greatly improving the mixing uniformity and ensuring that harmful components in the tail gas fully react with the reagent, but also regulates the airflow velocity and direction, avoiding component accumulation and corrosion caused by airflow deviation. This achieves self-adaptation and unattended operation in the waste gas treatment process, improving waste gas purification efficiency and device operation stability.