66 results about "Lead(II) sulfate" patented technology

The invention discloses a colloid electrolyte can improve the service life of a lead-acid cell, and the colloid electrolyte comprises the following raw materials by weight: 0.1-0.5% of polyethylene glycol, 0.1-1% of stannous sulfate, 0.5-1.5% of sodium sulfate, 0.5-1% of phosphoric acid, 0.05-2% of organosilicon polymer, 0.5-8% of fumed silica, 35-45% of sulfuric acid, and balanced of deionized water. The polyethylene glycol as a colloid stabilizer can prevent the occurrence of colloid coacervation or agglomeration before colloid is poured into the cell, colloidal stability is enhanced, and a stable three-dimensional network structure is formed; the stannous sulfate can be oxidized to tetravalent tin, the active material electrical conductivity and recharge ability after the cell is discharged can be improved, the sodium sulfate in the electrolyte can provides a certain amount of sulfate radicals for the electrochemical reaction, the degree of supersaturation of lead sulfate crystals can be reduced, formation of a lead sulfate layer with poor electrical conductivity can be prevented; the phosphoric acid can refine the grain diameter of the lead sulfate crystals; and silicon oxygen bonds and hydrogen bonds in the organosilicon polymer can effectively reduce the active material softening speed, inhibit the surface active material passivation, and improve the service life of the cell.

The invention relates to a wet process for treating lead copper matte, and belongs to the field of non-ferrous metal hydro-metallurgy. In the process, the lead copper matte is treated by a normal-pressure leaching wet process; and the lead copper matte is leached by sulfuric acid and sodium oxide, and oxygen is continuously introduced in the leaching process, wherein copper is leached, and the lead in forms of lead sulfate and lead chloride is retained in residue. After the leaching process is finished, liquid-solid separation is carried out and primary separation of metals is implemented; copper-containing leachate is reduced by scrap iron to form copper sponge, and solution after reduction serves as a raw material for recycling iron; and the leaching residue returns to a lead pyrometallurgy system, and valuable elements such as lead, silver, simple sulfur substance and the like are recycled. In the wet process, solution is not discharged, the environment is protected, and the wet process belongs to clean metallurgy; the process is simple and practicable, and is convenient to operate; and the cost is low and the comprehensive recoverability is high.

Provided is a metal which is one of tin, silver, copper, zinc, or indium, and has low alpha-ray emission, wherein the alpha-ray emission of the metal after being heated in air at 100 DEG C for 6 hoursis 0.002 cph / cm<2> or less. A metal selected from among tin, silver, copper, zinc, and indium, each of which contains lead as an impurity, is dissolved in an aqueous sulfuric acid solution to preparean aqueous solution of a sulfate of the metal, and lead sulfate in the aqueous solution is removed by precipitation. While stirring the aqueous sulfate solution from which lead sulfate has been removed, an aqueous lead nitrate solution containing lead having an alpha-ray emission of 10 cph / cm<2> or less is added to the aqueous sulfate solution to precipitate lead sulfate in the aqueous sulfate solution, and the aqueous sulfate solution is circulated while removing lead sulfate. The metal is electrolytically collected using the aqueous sulfate solution as an electrolytic solution.

A method to recover valuable metal from abandoned bricks by lines of gold and silver smelting, whose craft steps are as follows: de-magging from extraction of sulfuric acid, deprivation of lead sulfate etching by alkali, silver etching by nitric acid and gold etching by aqua regia. The process of de-magging from extraction of sulfuric acid is that: 200kg bricks powder of abandoned magnesia-chrome from lines of gold and silver smelting is stirred with 1350kg dilute sulfuric acid. The mixture reacts for 2 to 3 hours, and discharges clear MgSO4 strong solution. 100kg water is filled into extraction slot. Based on stirring, 25ppm flocculant is added and stewed for 10 minutes. After discharging MgSO4 solution, 1000kg is filled into extraction slot and filtrated to get MgSO4 wet materials. Then, it is neutralized with light-burned magnesia to achieve magnesium sulphate. Valuable metals including magnesium, lead, silver, gold and copper etc. can be recovered from abandoned bricks by lines of gold and silver smelting. Deposits including Cr(OH)3, Fe(OH)3, Cu(OH)2 and Al(OH)3 can be gathered for producing refractory materials, which realizes salvaging and reduces environmental pollution.

The invention discloses a process for selective efficient copper extraction and comprehensive recovery from lead copper matte and belongs to the field of wet processes of non-ferrous metal metallurgy. According to the process disclosed by the invention, the lead copper matte is taken as a raw material, and the process comprises the following steps: crushing, grinding and screening the lead copper matte, performing pulp conditioning on the lead copper matte after screening and sulfuric acid (or a waste electrolyte), then pouring into a high-pressure kettle, performing leaching, adding an adjusting agent A and introducing pure oxygen; controlling technical conditions, oxidizing sulfur in the lead copper matte to elemental sulfur in the oxidization and leaching processes, and transferring into slag; oxidizing copper to enable the copper to enter a solution in the form of copper ions and enabling lead to leave in the slag in the form of lead sulfate with gold and silver; and enabling most of iron to enter into the slag in the forms of hematite and yellow calcium iron vitriol under high-temperature, high-pressure and high-acid conditions. After the completion of the leaching process, liquid-solid separation is performed to realize primary separation of the copper and other valuable elements; after acid adjustment of a leachate, cyclone electrolysis is directly performed to extract the copper in the leachate, and then a cathode copper product which is in line with a national standard can be obtained; and leaching residues are sent into a lead pyrometallurgy system for comprehensively recovering Pb, Ag, Au and other valuable elements.

The invention discloses a method for obtaining flaky zinc through electro-deposition in an alkaline medium. By the adoption of the method for obtaining flaky zinc through electro-deposition in the alkaline medium, the flaky zinc is obtained under the alkaline medium condition in an electro-deposition manner through the synergistic effect of compound additive and stirred-liquid-flow mass transferring. The compound additive is composed of 0.1-10 g / L of gelatin, 0.1-10 g / L of EDTA, 0.1-10 g / L of DPE and 0.1-10 g / L of additive A. The additive A is any one or more of lead oxide, lead sulfate and lead carbonate. In the electro-deposition process, mechanical stirring at the speed of 50-150 r / min is adopted to form liquid flow, and the flaky metal zinc can be obtained. The formed flaky zinc is easy to flush and convenient to transport, and the formed flaky zinc can be more easily molten to form ingots.

The invention discloses a preparation method of an anti-corrosion composite coating on the surface of a lead alloy. The composition of the electrolytic solution for chemical deposition includes 5-30 mmol / L cerium ammonium sulfate, 1-5 g / L polyvinylpyrrolidone, and 1-8 mol / L sulfuric acid; the process conditions for electrochemical deposition are: the temperature is 25-60 ° C, the number of scanning cycles is 50-300, the potential range is ‑0.9-2V, and the deposition time is 10-50min. The main component of the passivation film formed on the surface of the lead alloy by the method of the invention is a composite film layer containing lead sulfate and a small amount of cerium element and organic matter, which is not only flat and dense, but also effectively enhances the corrosion resistance of the lead alloy; the method of the invention has a simple process, and Time-consuming.