70 results about "Cadmia" patented technology

The invention relates to an improved hot galvanizing method of an iron handicraft or furniture. The method comprises the following steps: (1) uncoiling and degreasing a workpiece; (2) removing dust; (3) washing; (4) assisting plating; (5) baking; (6) galvanizing by dipping; (7) settling; (8) passivating; (9) cooling. In the method, a degreasant is changed into acidity and is composed of a sulfuric acid solution, OP-10 and di-o-tolyl-thiourea. Thus, a washing procedure can be saved; a water resource and the degreasant can be saved; the workpiece does not generate an over-cleaning phenomenon; a pickling solution is composed of a hydrochloric acid solution, phosphoric acid, alkylphenol ethoxylates, lauryl sodium sulfate and ethylenediamine tetraacetic acid, so that the pickling speed is improved, formation of acid mist and use of a complexing agent can be restricted, reduction of cadmia in galvanizing zinc is facilitated, the malleability of a zinc coating on the surface of the work-piece is improved, proper temperature and event are adopted in the subsequent galvanizing by dipping, and the thickness and the stability of the zinc coating at the surface of the workpiece are ensured. Thus, the improved hot galvanizing method is a method which is simple and convenient for operation and good in galvanized effect.

The present invention discloses a cadmia reduction smelting method for the preparation of low-phosphorus iron. The method is as below: adding a slagging constituent into cadmia and roasting in an oxidizing atmosphere; then adding a reducing agent and conducting reduction smelting under an inert atmosphere; reducing the lead and zinc in the slag, volatilizing and entering into dust collection; and stratifying the slag phase to obtain pig iron and slag. The method reaches iron recovery of 84%, and obtains a pig iron product; and the iron grade is no less than 92.65%, contains 0.03% of lead, 0.001% of zinc and 0.06% of phosphorus, and reaches superfine class standards of the national steel-making pig iron. The invention can effectively recycle iron in cadmia, the pig iron product has low content of phosphorus, lead and zinc; the process is short, discharges few pollutants, and recycles lead and zinc, has good economic and environmental meaning.

The invention relates to the field of nonferrous metal smelting and particularly relates to a process for recovering lead, zinc and cadmium in soot on a recovery section in the process of treating waste acid generated in lead smelting. The soot of a reduction furnace is subjected to a leaching reaction by using arsenic sulfide removal waste acid in the lead smelting industry to generate lead slag to be recovered, and then, the leaching agent is continued to be neutralized by using sodium sulphide and sodium hydroxide to generate high-grade zinc and cadmium slag to be recovered. According to the invention, the waste acid is used for separating the lead, zinc and cadmium in the soot of the reduction furnace for lead smelting, so that the operation cost is low; the problem of production operation damage caused by circulated accumulation of the zinc and cadmium in lead smelting is solved and the pressure of a lead smelting system is relieved under the condition of low cost; and the lead slag which is low in arsenic content and suitable for being treated by a lead system and the zinc and cadmium slag which is suitable for being treated by a zinc system can be generated, and meanwhile, the waste acid is also treated, so that not only is the treatment cost of the waste acid reduced, but also the treatment difficulty is lowered.

The invention relates to a method for comprehensively recovering zinc nickel cadmium from copper cadmium residues. The method is characterized by including the steps: A leaching and purifying: simultaneously leaching and purifying the copper cadmium residues and filtering the copper cadmium residues to obtain leach liquor; B primary cadmium settling: adding zinc powder into the leach liquor in the step A to obtain primarily cadmium settled liquor and a sponge cadmium product; C secondary cadmium settling: adding substitute zinc powder into the primarily cadmium settled liquor in the step B to obtain secondarily cadmium settled liquor and crude cadmium; D zinc ingot production: performing 'extraction-washing-back extraction-electrodeposition-casting' procedures for the secondarily cadmium settled liquor obtained by the step C to produce a zinc ingot product; E nickel hydroxide neutralization and precipitation: precipitating and neutralizing nickel in zinc extraction raffinate obtained in the step D to obtain a nickel hydroxide product. The method is simple in process, low in cost and high in metal recovery rate, has the advantages of short process cycle, high efficiency and easiness in realizing automation and continuity, and is a clean pollution-free production process.

Provided is a recycling method for zinc smelting nickel and cobalt slag. The method comprises the steps that nickel and cobalt slag which is produced through three-section reverse antimony and two-section purification production is added to be subjected to one-section purification after being pulpified; copper and cadmium are removed in one-section purification by zinc powder remaining in the nickel and cobalt slag, copper cadmium cobalt slag is formed by the used slag, and then nickel and cobalt slag is not produced any more through purification. The copper cadmium cobalt slag is recycled by cadmium and is leached to separate copper and cadmium, the content of cobalt in the solution is 150-1000 mg/l, and the solution is returned back to a main system after the cobalt is recycled by an organic reagent. According to the recycling method, consumption of purification zinc powder is lowered by fully utilizing zinc powder remaining in the nickel and cobalt slag; a new way is developed for recycling of dangerous solid waste, like the nickel and cobalt slag, produced in wet zinc smelting; the technological process of cadmium recycling production is simplified, production operation is simple, and no precedent reports exist at home and abroad.

The invention relates to a preparation method of high-purity indium. The preparation method comprises the following steps: an acid leaching step of leaching the material indium to dilute sulphuric acid, so as to remove oxide on the surface of the material indium; a measuring step of getting the material indium out of the dilute sulphuric acid, cleaning and drying the material indium, and measuring the impurities and content in the material indium by a photometer, wherein the impurities include copper, tin, arsenic, zinc, thallium, lead, iron, cadmium and aluminium; a smelting and impurity-removing step of smelting the impurity-removed material indium and removing the impurity of tin, thallium and cadmium. According to the preparation method of the high-purity indium, firstly, the impurities of tin, thallium and cadmium, which are difficult to electrolyze and of which chemical potentials close to that of indium, are smelted to reduce the content of the tin, the thallium and the cadmium; and then the content of copper, tin, arsenic, zinc, thallium, lead, iron, cadmium, aluminium and the like are further reduced by secondary electrolysation, so that the high-purity indium achieves the purity of more than 5N, thereby satisfying the usage requirements; and moreover, the preparation method is simple to operate, and is capable of preventing the poisonous gas from polluting the environment.

The invention relates to a smelting method of a high-iron multi-metal zinc concentrate. The method comprises the following steps: performing oxygen-enrichment oxidation melting on a zinc concentrate containing 14% to 20% of Fe, 0.03% to 0.10% of In, 0.2% to 0.6% of Cu, 0.2% to 0.6% of Cd, 0.005% to 0.02% of Ag, 0.1% to 0.2% of Sn and 40% to 50% of Zn so as to generate an oxidized flue gas and molten slags; preparing the oxidized flue gas into sulfuric acid; performing reduction smelting on the molten slags in a smelting pool so as to generate a crude zinc alloy, crude copper containing silver and slags; blowing the slags so as to obtain smoke dust and blown slags; returning the smoke dust to be subjected to reduction smelting; selling the blown slags in a market; extracting the copper and the silver from the crude copper containing silver; and performing four-stage distillation on the crude zinc alloy entering an electric-heating graphite vacuum furnace so as to generate a pyrogenic distilled zinc product, a crude cadmium product and a high-indium-tin zinc alloy which is used for extracting indium and tin. The method is reasonable in process, good in comprehensive recovery, high in production efficiency, low in production cost and clean and environmentally friendly in production process.

The invention discloses a method for removing copper, cadmium, nickel and cobalt out of a zinc sulfate solution through one step. The method comprises the steps that manganese metal powder and/or manganese-based alloy powder are/is added into the zinc sulfate solution containing copper, cadmium, nickel and cobalt, wherein the temperature of the zinc sulfate solution ranges from 45 DEG C to 70 DEG C, and the pH of the zinc sulfate solution is larger than 4.0; and stirring is carried out for a reaction, after the reaction is finished, filtering separation is carried out, and the zinc sulfate solution with the contents of copper, cadmium, nickel and cobalt all lower than 0.8 ppm is obtained. According to the method, copper, cadmium, nickel and cobalt can be efficiently removed out of the zinc sulfate solution through one step at the same time, no impurities endangering zinc electrolyzing are introduced, the technological process is simple and low in cost, no complex and special equipment is needed, and good industrial application prospects are achieved.

The invention provides a zinc-doped potassium sodium niobate based lead free piezoelectric ceramic material synthesized at a low temperature, belonging to the environment-friendly functional ceramic material field. The composition is (1-x)(NaaKbLic)NbO3+xZnO, wherein, a(1-x), b(1-x), c(1-x) and x respectively represent the molar fraction of components of Na, K, Li and Zn, a is more than or equal to 0.20 and less than or equal to 0.80, b is more than or equal to 0.20 and less than or equal to 0.80, c is more than or equal to 0.00 and less than or equal to 0.30, and x is more than or equal to 0.00 and less than or equal to 0.30. The preparation method comprises the process steps of weighing raw materials, mixing, baking, forming, sintering, baking silver and polarizing, etc. The material has the advantages that the sintering temperature of the potassium sodium niobate based lead free piezoelectric ceramics is effectively reduced by doping ZnO, ZnCO3 or alkali cadmia, and the potassium sodium niobate based lead free piezoelectric ceramic sample with good performance is synthesized at a low temperature of between 900 and 1,200 DEG C.

The invention relates to a process for recovering cadmium from cadmium-contained incineration slag. The process comprises the following steps: water leaching: the cadmium-contained incineration slag is leached by water, so that soluble salt in the cadmium-contained incineration slag is dissolved in the water; and water leaching liquid is obtained, and is separated from the cadmium-contained incineration slag; heap leaching: according to the properties of cadmium in the cadmium-contained incineration slag, sulfuric acid, hydrochloric acid or nitric acid is selected for segmented heap leaching, so that cadmium enters heap leaching liquid, and the content of cadmium in the cadmium-contained incineration slag reaches the discharge standard; enrichment: according to the properties of cadmium in the heap leaching liquid, resins are adopted to absorb low-concentration cadmium in the heap leaching liquid; cadmium is enriched in the resins; and absorption post liquid is obtained, and is returned for secondary heap leaching; desorption: the selected cadmium is used for absorbing the resins; and the sulfuric acid is adopted to desorb the absorbed resins at normal temperature to obtain cadmium liquid; and electrolysis: the cadmium liquid is electrolyzed; cadmium ions in solution are separated out on a cathode plate in a cadmium ingot form; and electrolysis post liquid is obtained.

The invention belongs to the technical field of hydrometallurgy and particularly relates to a method for recycling zinc, copper and cadmium from zinc hydrometallurgy copper-cadmium residues. According to the method, recycling of the zinc, the copper and the cadmium is completed through the seven steps of oxygen pressure leaching, neutralization iron removal, electrolysis, vacuum distillation, separation, copper-rich residue treatment and electrolysis residual liquor treatment. The whole technological process is short, the amount of waste residues and waste water is small, the environmental pollution is less, and the production cost is low.

The invention relates to a method of comprehensively recovering lead and zinc in high mud carbonate lead-zinc oxide ores by combining beneficiation and smelting to solve the problem that zinc concentrate and lead concrete low in mutual content ratio in high mud carbonate lead-zinc oxide ores cannot be separately obtained by means of conventional vulcanization and sorting processes and the difficulty of comprehensively recovering lead and zinc is great. By means of dissolving difference of smithsonite and cerusite in the same pH region, zinc and lead are dissolved selectively so as to achieve the purpose of comprehensively recovering zinc and lead, high energy consumption of roasting and volatilization is avoided, and meanwhile, pollution of exhaust gas and dust is reduced and the processing flow is shortened.

The invention discloses a method for separating zinc-cadmium-lead alloy materials from copper-cadmium slag and nickel-cobalt slag generated in a zinc smelting process. The method comprises the following steps that a mixture of the copper-cadmium slag, the nickel-cobalt slag or the copper-cadmium slag and the nickel-cobalt slag are prepared into the coal powder and alkaline-earth metal oxide, the mixture is subjected to vacuum distillation, the distillation pressure is less than 200 Pa, heating is started, the distillation temperature ranges from 900 DEG C to 1200 DEG C, then heat preservationis carried out for 0.5h-10h, the distillate obtained by collecting and distilling contains lead, zinc, and cadmium alloy materials, and the distillation residues are copper, nickel, cobalt and the like. According to the method, the lead, the zinc, the cadmium, the copper and the nickel in the copper-cadmium slag and the nickel-cobalt slag are utilized, the lead in the copper-cadmium slag and the nickel-cobalt slag is realized by the vapor pressure difference of the cobalt at different temperatures, zinc, cadmium, copper, nickel and cobalt, a large amount of lead, zinc and cadmium in the distillation process can be separated, and the residual substances in the distillation residues are copper, nickel and cobalt, so that the preliminary separation of metal in the copper-cadmium slag and thenickel-cobalt slag is realized. The method is convenient to operate, high in energy utilization rate and heating efficiency, safe, sanitary and pollution-free.

The invention relates to a smelting method of high-indium high-iron zinc concentrate, which comprises the following steps: carrying out boiling-bed roasting on high-indium high-iron zinc concentrate, carrying out neutral leaching on the obtained roasted product, and carrying out purifying electrolysis on the neutral leaching solution to produce electrodeposited zinc; washing the neutral leaching slag with countercurrent water, returning the washing water to the neutral leaching preparation solution, carrying out strong-reduction smelting on the washed slag to produce a crude zinc alloy, sending the crude zinc alloy into a lead tower to perform distillation, sending the obtained zinc cadmium alloy into a cadmium tower to perform secondary distillation, carrying out casting cooling on the produced distilled zinc to obtain a zinc ingot product, distilling the high-cadmium zinc alloy in a low-temperature tower, using the obtained crude cadmium for producing a cadmium ingot, and returning the low-cadmium zinc alloy to the cadmium tower for distillation; and distilling the zinc indium bottom solution in a high-temperature tower, returning the produced high-temperature crude zinc to the lead tower for distillation, and carrying out crushing, leaching, extraction, replacement and electrolysis on the high-indium alloy to extract the indium. The method has the advantages of reasonable technique, clean and environment-friendly process, less emission of three wastes, high production efficiency and low production cost.

The invention discloses a method for performing wet desulfurization and zinc sulfate recycling through the cooperation of copper slag tailings and zinc smelting fly ash, and belongs to the technical field of comprehensive utilization of resources. The method mixes copper slag tailings, zinc smelting fly ash and water to prepare into desulfurization pulp; flue gas is in contact reaction with the pulp; the sulfur dioxide in the flue gas is absorbed into the slurry and is catalyzed and oxidized into sulfuric acid by the oxygen and valuable metal ions in the flue gas; the iron, zinc, manganese, aluminum and other elements in the copper slag tailings and the zinc in the zinc smelting fly ash can be further leached out by the sulfuric acid; the reacted pulp can obtain filter residues and filtrate through filtering; the iron can be precipitated by adding alkali into the filtrate; heavy metal arsenic in the filtrate can be removed through the utilization of the flocculation of ferric hydroxide; the cadmium and lead in the filtrate can be displaced by adding zinc dust; and a product zinc sulfate can be finally obtained by introducing the slurry into a zinc sulfate system after flocculation.The method is simple in operation and low in operation cost; the copper slag tailings and the zinc smelting fly ash can be recycled to remove the sulfur dioxide in the flue gas; and the zinc in the desulphurization slurry can be recycled, so that a zinc sulfate by-product can be obtained.

The invention discloses a method for removing copper and cadmium from zinc sulfate leachate. A middle supernate of a zinc hydrometallurgy production system is taken out, metal lead powder is added, and copper slag and copper removal liquid is obtained after the metal lead power is replaced and filtered; aluminum powder or iron powder is added into the copper removing liquid and filtered so as to obtain high-grade cadmium-sponge and cadmium-removal liquid. The method is short in technological process and low in reagent cost, and impurity copper and cadmium in a zinc sulfate solution are removedstep by step, copper slag, sponge cadmium, the copper and the cadmium are recycled step by step, and the copper slag is sent to the top blowing furnace system, so that comprehensive recovery is realized.

The invention discloses a hot dipping pool for a hot galvanizing technology and the hot galvanizing technology. The hot dipping pool is internally provided with an adapting part used for adapting cadmia. The adapting part is provided with a plurality of first adapting cavities used for adapting the cadmia. The sections, perpendicular to the direction of the adapting part, of the first adapting cavities are of arch shapes. Openings are formed in the first adapting cavities. The centers of circles of curvature circles of the first adapting cavities at openings are located on the sides, facing the interior of the first adapting cavities, of the first adapting cavities. The hot galvanizing technology comprises the following steps of pickling, rinsing, assistant plating, heat plating, cooling and passivating, and the hot galvanizing technology has the advantages that surface defects of steel components caused by the cadmia are reduced.

The invention discloses a method for recycling copper and cadmium from copper and cadmium sediment, and belongs to the technical field of recycling of by-products of smelting engineering. By the principle that zinc, cadmium and oxides of the zinc and the cadmium in the copper and cadmium sediment are easily dissolved in sulfuric acid but copper is not dissolved in the sulfuric acid, the copper isseparated from the zinc and the cadmium, then metal copper slag with the copper content greater than 65% is produced by washing and filtering, the copper slag is sold as a copper smelting raw material, and thus, the copper and cadmium sediment is utilized effectively, and has high economic benefit. By recycling the copper and cadmium sediment, the stacked and stored copper and cadmium sediment isreduced, and pollution to the environment is relieved.

The invention relates to a method for removing a chlorine from zinc solution by adopting cadmium removed and surface naturally-oxidized copper slag, and belongs to the field of zinc wet metallurgy. The method concretely comprises the following steps: 1, leaching cadmium from fresh copper and cadmium slag of the zinc solution in sulfuric acid to obtain cadmium removed copper slag with the Cu content of 15-70% and the Cd content of 0.2-1%; 2, piling up the cadmium removed copper slag until the surface is naturally oxidized and the natural oxidation degree is 5-35%; 3, adjusting the initial sulfuric acid concentration by using a chlorine-containing zinc solution, adding 5-50 kg/m<3> of the oxidized copper slag, and stirring the solution and the oxidized copper slag, wherein a ratio of NCu/NCl is 1.4-2.0, the chlorine removal temperature is controlled to be 30-80 DEG C, and the chlorine removal duration is 0.5-1 h; and 4, carrying out filtration and removal after the reaction ends in order to obtain a chlorine removed zinc solution and chlorine removed slag. The method adopting a prior cadmium removal technology reduces the impurity content of the copper slag, and improves the copper grade of the copper slag; the cadmium removed and surface naturally-oxidized copper slag is adopted to substitute fresh copper slag, so a copper sulfate or oxidized leached copper slag process for preparing a copper sulfate solution is avoided; and the method has the advantages of effective simplification of the process, production cost reduction, and increase of enterprises' economic benefits.

The invention discloses a method for removing iron through external circulation standing and cooling during continuous hot-dipping of zinc and aluminum and relates to the technical field of hot-dip galvanizing. The adopted technical scheme is that: a low-temperature standing zinc pot is arranged on the side of a galvanizing zinc pot, zinc-aluminum melt is driven to pass through a pipe to be led out of the galvanizing zinc pot, so that zinc liquid flows into the low-temperature standing zinc pot, and the process of removing the iron in the zinc liquid is performed in the low-temperature standing zinc pot. The low-temperature standing zinc pot is heated by a resistor, and the temperature difference between the low-temperature standing zinc pot and the galvanizing zinc pot is reasonably controlled, the iron in the zinc-aluminum melt is separated out in the low-temperature standing zinc pot through standing and cooling by using different solubility of iron at different temperatures and density difference between iron-containing cadmia and the zinc-aluminum melt, and the iron-containing cadmia is generated and settled at the bottom of the zinc-aluminum melt; and the zinc-aluminum melt which is subjected to standing and purification passes through a pipe connected with the galvanizing zinc pot to flow back into the galvanizing zinc pot so as to finish the process for removing the iron from the zinc-aluminum melt. The method can be used in and out of the line of hot-dipping of zinc and aluminum, so that the content of the iron in the zinc liquid in the galvanizing zinc pot can be reduced obviously, the quality of coating is improved and the waste of the zinc and aluminum is reduced.

The invention relates to a wet treatment method for recycling copper and zinc in bismuth middlings. The wet treatment method comprises the steps that the bismuth middlings are subjected to wet grinding into powder in which minus 160 mesh-powder occupies 98%, the powder and diluted zinc electrolysis effluent are subjected to slurrying, preimpregnation and filtration, and filtrate of which the finalacidity is 20 g/L to 30 g/L and filter residues are obtained; the filter residues are subjected to high-temperature roasting desulfuration into oxides, bismuth oxides and bismuth concentrate are subjected to mixing and smelting into raw bismuth; after pH of the filtrate is adjusted to 1.5 to 2.0, filtrate is subjected to 3-grade counter-current extraction, 2-grade washing and 2-grade reverse extraction through 20%+80%N902 kerosene, a copper sulfate solution is obtained, the copper sulfate solution enters a copper electrodeposition system, and 99.9% cathode copper is separated at a cathode; copper extraction raffinate is neutralized, iron is removed, impurity elements like copper and cadmium are removed from zinc powder, a liquid is extracted and purified through 40%+60%P204 kerosene, anda zinc sulfate solution is obtained through 4-grade counter-current extraction, 3-grade washing and 3-grade reverse extraction; and oil in the zinc sulfate solution is absorbed through a degreaser, and the zinc sulfate solution is introduced into a zinc electrodeposition system to be subjected to zinc electrodeposition. According to the wet treatment method, material consumption is low, the automation degree is high, waste water, wastes and waste residues are not generated during the production process, and a pollution-free clean technology is adopted.

The invention provides a method for recycling cadmium metal from dust of a lead-smelting bottom-blowing furnace, which can be used for treating the ash of the bottom-blowing furnace and displacing with aluminum powder to recycle cadmium. The method for recycling the cadmium metal from the dust of the lead-smelting bottom-blowing furnace comprises the following steps: (1) a leaching procedure: carrying out water immersion on the ash of the lead-smelting bottom-blowing furnace and enabling a Cd compound to enter a liquid phase; enriching compounds including Pb, As and the like which are not dissolved in water in leaching residues; then separating to obtain a leaching solution and the leaching residues; (2) a displacement procedure: taking out the leaching solution and regulating the pH (Potential of Hydrogen) of a mixed solution of sulfuric acid and hydrochloric acid to 2.0 to 2.5; heating to 103 to 105 DEG C; displacing with the aluminum powder with the granularity of 140 to 200 meshes,so as to obtain high-cadmium residues and a displaced solution.

The invention discloses a recycling method for nickel in nickel-cadmium-zinc slag, and relates to a comprehensive recycling method for nickel-cadmium-zinc waste residues generated in a waste nickel-cadmium battery recycling and metallurgical process. The recycling method is characterized in that a recycling process for the recycling method comprises the following steps: (1) adding the nickel-cadmium-zinc slag into a sodium hydroxide solution to carry out leaching; (2) washing the obtained leached residues; (3) drying the washed leached residues, then, carrying out reduction smelting for reducing cadmium oxide and nickel oxide in the slag into elementary-substance cadmium and elementary-substance nickel, and recycling volatilized cadmium in dust collecting equipment; and (4) after the reduction is ended, continuously smelting the rest of nickel, and pouring the rest of nickel into a nickel ingot or atomizing the rest of nickel into nickel powder. Compared with a conventional recycling process, the recycling method for nickel in the nickel-cadmium-zinc slag has the advantages of being short in process, complete in nickel-cadmium-zinc separation, high in a nickel recovery rate, and the like.