180results about How to "Reduce copper content" patented technology

The invention relates to a lead-free environmental silicon brass alloy bar or alloy ingot and the alloy material comprises the following chemical elements by weight percent: 60%-70% of copper, 0.7%-3.0% of silicon, 0.15% or less of aluminium, 0.25% or less of lead, 0.5% or less of iron, 0.3% or less of tin, 0.1% or less of phosphorus, 0.2% or less of nickel, 0.25% or less of antimony and the balance zinc and unavoidable impurities. The lead content of the silicon brass alloy material of the invention is greatly reduced, which corresponds to the demand of environmental protection and health; the alloy material has good casting property and is applicable to casting, in particular to large-scale gravity casting so as to have broad application prospect in health fittings industry.

Lead-free solder compositions suitable for joining electronic devices to printed wiring boards, which comprises by weight 0.2 to 0.9% copper, 0.006 to 0.07% nickel, 0.03 to 0.08% bismuth, less than 0.5% silver, less than 0.010% phosphorus, and a balance of tin and inevitable impurities. A solder composition embodying this invention finds particular application in automated wave-soldering machines where conventional lead-free solders dissolve excessive copper from printed wiring circuitry and component terminations.

A stream of shredded scrap metal is divided into increments. A bulk material analyzer is employed to determine the bulk chemical composition of each increment. The increments are then sorted on the basis of the bulk chemical composition of each increment.

A technology for treating and purifying copper electrolyte by vortex electrolysis relates to the technical field of copper electrolyte purification. The treatment process comprises the steps of: 1. carrying out secondary filter on copper electrolyte to be purified and treated; 2. sending into a vortex electrolysis system to produce standard cathode copper; 3. after three segments of vortex electrolysis, sending the solution with a copper content of 2-4g/L to a vortex electrolysis powder impurity removal stage; 4. removing impurities of arsenic, antimony and bismuth in a powder vortex electrolytic tank; and 5. forming a small amount of black copper ash with a low copper content in a filter cake after press filtration and sending a filtrate into a next operation. The technology of the invention can substitute a traditional induction copper and impurity removal method for purifying and treating copper electrolysis waste liquid, so as to provide an electrolysis technical scheme, which is efficient and reliable, and has simple process flow, simple operation and low cost, for purifying copper electrolysis waste liquid.

A process for removing lead and copper from drinking water discharged from a drinking water outlet while suppressing the concentration of phosphate ions comprising directing the water through a matrix comprising phosphate mineral with a very low phosphate solubility, and a solid carbonate mineral which is slightly soluble in water. The matrix is sized such that there is sufficient contacting between the water and the matrix to form a lead phosphate precipitate, reduce the lead concentration in the water to below 15 parts per billion, and suppress the phosphate ion concentration to 5 mg/L, preferably 3 mg/L, or below.

The invention discloses an electrothermal copper-smelting slag depleted furnace, which comprises a furnace body, supports, an oxygen lance and electrodes; the furnace body comprises a furnace shell defining a furnace chamber and a refractory material layer arranged on the inner wall of the furnace shell, the furnace body is provided with a feed inlet for feeding copper-smelting slag and vulcanizing agent into the furnace chamber, a siphon inlet for discharging copper matte, a waste slag-discharging outlet, electrode plugholes, a smoke outlet and an oxygen lance plughole, wherein the oxygen lance plughole is formed at the bottom of the furnace shell; the furnace body is supported by the supports; the oxygen lance is plugged into the oxygen lance plughole; and the electrodes are plugged into the furnace body via the electrode plugholes. When the electrothermal copper-smelting slag depleted furnace is used for bottom-blowing electrothermal copper-smelting slag depletion, the copper content in waste slag can be reduced, and electricity consumption can be decreased.

The invention provides a dilution treatment method for copper smelting slag. The dilution treatment method includes the technological steps that firstly, a mechanical stirring device is introduced into a dilution furnace, the high-temperature molten state copper smelting slag at the temperature ranging from 1150 DEG C to 1350 DEG C is guided into the dilution furnace, a stirring paddle is adjusted to stretch to the part from the 1/3 position of the liquid level of the copper smelting slag to the 1/2 position of the liquid level of the copper smelting slag, heating and stirring are started, the temperature of the copper smelting slag is controlled to range from 1200 DEG C to 1350 DEG C, the stirring speed ranges from 50 r/min to 200 r/min, and a vortex with the diameter height ratio ranging from 0.5 to 3 is formed; secondly, a vulcanizing agent is carried through carrier gas and injected to the position, close to the center of the vortex, of the surface of a copper smelting slag pool through a nozzle above the liquid level of the high-temperature molten state copper smelting slag, the adding amount of the vulcanizing agent is 0.3-8% of the mass of the copper smelting slag, and heat-preservation stirring is conducted for 10-60 min; and thirdly, standing layering is conducted, and copper matte on the lower layer and diluted slag on the upper layer are collected. The copper content of the diluted slag obtained after treatment is below 0.3%.

The invention belongs to the field of nonferrous metal hydrometallurgy and discloses a process of efficiently recovering copper from lead matte according to oxygen pressure acid leaching and vortex electrolysis techniques. The method includes: taking lead matte as a raw material, crushing and grinding the lead matte, screening through a 100-mesh sieve, adding into a high-pressure autoclave along with sulfuric acid and a dispersing agent, feeding oxygen for leaching, carrying out liquid-solid separation to obtain solution containing copper sulfate, subjecting the solution containing copper sulfate to vortex electrolytic decopperation to obtain cathode copper, and returning after-electrodeposition liquid to the leaching procedure to replace sulfuric acid serving as the leaching agent. High efficiency in copper recycling can be realized, electrodeposition of copper can be selectively carried out according to the vortex electrolysis techniques, and high current level and current efficiency, low reagent consumption, reduction of production cost and improvement of enterprise benefits are realized. In addition, due to closed cycle of solution, harmful gas emission is avoided, and current concepts of circular economy and environment protection are met.

The invention provides a brass alloy. The brass alloy comprises 45wt%-55wt% of Cu, 0.5wt-7wt% of Mn, 0.5wt%-5wt% of Al, 0.5wt%-4wt% of Fe, 0.05wt%-2wt% of Si, 0.001wt%-0.5wt% of P, and the balance of Zn According to the application of the invention, Cu and Zn are used as main addition elements, and the elements of Mn, Al, Fe, Si and P , which have strengthening effects, are added, so that the brass alloy uses a beta phase as a matrix, and the brass alloy has higher plasticity and higher strength; under the circumstance of ensuring that the brass alloy has higher strength and higher plasticity, the content of the copper is reduced, so that the cost of the brass alloy is reduced.

The invention relates to the technical field of copper smelting and provides a mine selecting and copper extracting process. The mine selecting and copper extracting process comprises the following steps: a) primary grinding of copper slag is conducted; b) primary select flotation of slag obtained in the step a) is conducted, and primary slag concentrate and primary select flotation of tailings are obtained; c) secondary grinding of the primary select flotation of tailings is conducted; d) slag obtained in the step c) is activated, and secondary select flotation of activated slag is conducted. Copper in smelting slag is extracted repeatedly in a staged mode, so that copper content in the slag is reduced, and waste slag standard is reached. An experimental result shows that the copper content of slag tailings obtained is 0.30wt%-0.35wt% after select flotation and activating, and the waste slag standard is reached.

This invention discloses a system for treating copper-containing wastewater from micro etching of printed circuit board. The system comprises a copper separation system, an electrolysis system, a wastewater pre-treatment system and a wastewater post-treatment system. The copper separation system comprises a copper extractor and a copper back extractor. The electrolysis system comprises an electrolysis tank and a NaClO electrolysis membrane. The wastewater pre-treatment system comprises a copper-containing wastewater pool and an automatic pH detector. The wastewater post-treatment system comprises an oil-separation tank, a stirrer and a lift oil-absorber. The treatment method combines stirring, clarification and back extraction, and recovers solutes from aqueous solution by using extraction technique. The copper-removing rate is up to 90%, and the copper content in the wastewater is reduced by at least 80%. The wastewater can meet discharge standards.

The invention discloses a Lactobacillus plantarum, which is preserved on September 23, 2013 in China General Microbiological Culture Collection Center belonging to China?Committee?for?Culture?Collection?of?Microorganisms, and has a preservation number of CGMCC NO.8246; and the preservation address is Institute of microbiology of Chinese Academy of Sciences, No.3, Yard No.1, West Beichen Road, Chaoyang District, Beijing. The Lactobacillus plantarum provided by the invention has acid resistance, good in vitro tolerance to copper ions, can tolerate copper ion solution with initial concentration of 50 mg / L, has strong adsorption of copper ions, and can reduce the copper content in liver, kidney and brain of copper-exposed mice, mitigate the pathological symptoms of copper-exposed mice, alleviate liver injury and lower AST and ALT contents in serum of mice. The Lactobacillus plantarum is used for the preparation of pharmaceutical compositions and fermented food to alleviate the toxicity of copper, and has wide application prospect.

The invention relates to a submerged arc welding wire for superstrength pipeline steel and a production method thereof. The technical scheme is that: the submerged arc welding wire comprises the following components in percentage by weight: 0.04 to 0.06 percent of C, 1.40 to 2.00 percent of Mn, 0.70 to 1.10 percent of Mo, 2.00 to 2.60 percent of Ni, 0.80 to 1.20 percent of Cr, 0.10 to 0.30 percent of Cu, less than or equal to 0.0005 percent of B, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P and the balance of Fe and inevitable impurities. The production method comprises the following steps of: adding 0.01 to 0.5 weight percent of composite additive when the components are smelted, forming a square billet in a pouring way, hot-rolling the square billet to form a steel wire rod with the diameter of Phi 5.5 to Phi 7.5mm, removing oxide skin from a surface, drawing the steel wire rod to form the welding wire with the diameter of Phi 3.2 to Phi 4.0mm and performing copper plating, wherein the composite additive is added in form of cored wire. The welding wire produced by the method is welded together with an SJ105 welding flux so as to achieve the tensile strength sigmab of more than or equal to 910MPa and the impact toughness Akv at -30 DEG C of more than or equal to 84J of a weld metal, and is suitable for the submerged arc welding of X120 pipeline steel with superstrength.

The invention provides a smelting furnace for continuously smelting blister copper through copper sulfide concentrate and a smelting method of the smelting furnace. The smelting furnace is an integrated metallurgical furnace with the front-end top-blown smelting function, the middle electric furnace setting function and the tail-end matte continuous converting function and comprises a front-end top-blown smelting furnace, a middle setting electric furnace and a tail-end matte continuous converting furnace with the bottoms communicated sequentially. According to the smelting method, the procedures that the copper sulfide concentrate is continuously smelted into mixed melt of matte and slag through the converting furnace, settling separation of the matte and the slag is performed continuously, and the matte is continuously blown into blister copper are not needed. The three metallurgical processes that the copper sulfide concentrate is smelted into the mixed melt of the matte and the slag, settling separation of the matte and the slag is performed, and the matte is continuously blown into the blister copper can be continuously finished, the equipment structure and the operation process are simple, energy consumption is low, and environmental friendliness and safety are achieved.

The invention relates to a powder metallurgy Fe-Cu-Sn oil-retained bearing and the production process for the bearing. The bearing essentially comprises the following raw materials by weight: -100 mesh reduction Fe powder 96.5 swung dash 98%, -325 mesh Cu-Sn powder 2 swung dash 3.5%, lithium stearate 0.6 swung dash 1.0%. Wherein, in Cu-Sn alloy, Cu:Sn=7:2.5 swung dash 3.5 by weight. The production process is: weighing -100 mesh reduction Fe powder, -325 mesh Cu-Sn powder and lithium stearate by proper proportions; mixing them in a double-conic mixer at 19 swung dash 21r/min for 30-35 min; pressing the mixture under 300MPa swung dash 450MPa into blanks for oil-retained bearing; sintering the pressed blanks for 20-30 min under 880 swung dash 900 Celsius system, so sintered blanks are obtained; finishing and soaking by lubricating oil. The invention is of high strength, high oil content, low friction coefficient, low copper content, low material cost and process cost.

The invention discloses a two-level copper removing technology for treating low-concentration comprehensive wastewater in PCB electroplating. The two-level copper removing technology comprises a two-level copper removing process: hydrated copper ions in wastewater are removed in a primary cooper removing process; complex cooper irons are removed in a secondary cooper removing process. The two-level copper removing technology specifically comprises the following steps: after being lifted, the wastewater enters a pH adjustment tank; through pumping, an alkaline chemical agent is added to control the pH value of the wastewater to be 8.5-9; the adjusted wastewater I enters a quick mixing tank and a slow mixing tank in sequence; clear water obtained through primary precipitation is lifted through pumping and enters a complex breaking tank; a proper amount of ferrous sulfate is added for complex breaking; the pH value of the primarily treated wastewater is adjusted to be 8-9; the adjusted wastewater II enters the quick mixing tank and the slow mixing tank in sequence; the wastewater subjected to secondary precipitation enters a pH call-back tank for biochemical treatment; the standard wastewater is discharged. The two-level copper removing technology has the advantages that the chemical agent treatment cost is reduced, the discharged water quality is stabilized, the sludge minimization and the recovery value resource utilization are facilitated, and a high popularization value is achieved for wastewater treatment in the conventional PCB industry.

The invention relates to a lead-free brass alloy containing the following components in percentage by weight: 0.3%-0.8% of aluminum, 0.01%-0.4% of bismuth, 0.05%-0.15% of ferrum and more than 96% of copper and zinc, wherein the copper content of the lead-free brass alloy is 58%-75%. The brass not only accords with the standard of the lead-free alloy environmental protection laws and regulations that the lead content is less than 0.25%, but also contains 0.05%-1.5% of ferrum and less than 0.4% of bismuth, so that the production cost can be reduced, the defects of cracks, slag inclusion and the like existing in castings can also be reduced, and therefore, the yield and the qualified rate of the product are effectively improved.

The invention discloses a floating magnetic combined copper-molybdenum sorting-separation method. Copper-molybdenum bulk concentrate is adopted as fed ore, copper-inhibiting molybdenum-floating flotation separation is carried out, and a foam product generated after copper-inhibiting molybdenum-floating flotation separation is subjected to copper-molybdenum re-separation with a superconductive magnetic separator with the background magnetic field strength being 3,200 kA/m to 4,800 kA/ml; an obtained non-magnetic part is a molybdenum concentrate product, and an obtained magnetic part serves as middling and is returned to be subjected to copper-inhibiting molybdenum-floating flotation separation roughing work; and an underflow product obtained after copper-inhibiting molybdenum-floating flotation separation is subjected to copper ore flotation, and copper concentrate is obtained. Collection of the copper ore is reinforced in a superconductive magnetic separation manner, the separation effect of copper and molybdenum is further improved, the copper content in later molybdenum concentrate is reduced, and then the recovery rate of molybdenum and copper is increased.

The invention discloses a fast treating method for copper mine waste water. A mixture composed of poly aluminium chloride, potassium ferrate, dimethyl diallyl ammonium chloride, potassium feldspar, bissuccinimide, quartz sand, polyacrylamide, diethylenetriaminepenta acid, urea, citric acid and activated sludge is adopted as a cleaning agent, matched with a flocculating agent with polyferric sulfate, bentonite, zeolite powder, ethoxylated lauryl alcohol sulfate and alum as constituents, and assisted with technologies of deep oxidation, flocculation, ultrasound, resin adsorption, filtration, sterilization, membrane separation and the like, therefore, the copper content and the COD value in the copper mine waste water are effectively reduced, industrial requirements can be met, and the method has a good application prospect.

A micro-copper-formulated ceramic brake pad is made with aramid pulp, carbon fiber, magnesium hydroxide, copper fiber, brown fused alumina, antimony sulfide, ceramic fiber, superfine iron oxide powder, calcium sulfate whisker, potassium titanate, barite, crystalline flake graphite, calcined petroleum coke, nano hollow float beads, flake aluminum powder, nitrile butadiene rubber powder, cashew nut shell oil modified phenolic resin, zirconite, boron nitride, zinc oxide, and benzoxazine resin. The components are reasonably matched, and advantages of the materials can be given to full play in abrasive materials. The novel fiber materials are reasonably composited, performance defects of the materials can be mutually complemented, and high performance is achieved through mutual connective action. The micro-copper-formulated ceramic brake pad has low content of heavy metals and smaller than 0.5% of copper content and therefore, is very environment friendly.

The invention discloses a cast iron material with higher hardness, corrosion resistance, high-temperature oxidation resistance and abrasion endurance of an abrasive material with larger impact load. The cast iron material consists of the following compositions by weight percentage: 2.8 percent of C, 0.2 to 1.0 percent of Si, 0.5 to 1.0 percent of Mn, less than or equal to 0.06 percent of S, less than or equal to 0.1 percent of P, 21 to 23 percent of Cr, 0 to 1.5 percent of Ni, 1.0 to 1.5 percent of Mo, and the balance being Fe and unavoidable impurities. The cast iron material has the advantages of improving hardness and other comprehensive performances of the material, and being helpful for prolonging the service life of a finished product manufactured by the cast iron material.