76results about How to "Reduced zinc content" patented technology

The invention relates to an environment-friendly low-zinc organic phosphorus corrosion and scale inhibitor, which comprises the following components in percentages by weight: organic phosphono-carboxylic acid (PBTC) 20 to 25%, organic phosphoric acid (HEDP) 10 to 12%, organic phosphoric acid ester 5 to 8%, zinc salt 3 to 4%, macromolecular dispersing agent with sulfonic group, mildew inhibitor 0.5%, and pure water accounting for the rest percentage. The corrosion and scale inhibitor in the invention has the advantages that: the zinc content in circulating water and sewer water is less than 1.5mg/L, and desirable corrosion and scale resistant effects can be achieved at the same time of reducing the pollution to the environment.

The invention provides an application of a repairing composition used in heavy metal contamination of soil. The composition comprises lentinan and chitosan and can be used for increasing the yields of plants such as peppers and the like on the heavy metal jointly contaminated soil. Besides, the invention also provides a preparation and the like based on the composition.

The invention provides combined application of an agricultural preparation containing zinc-selenium and a soil heavy metal repairing agent. The soil heavy metal repairing agent comprises lentinan and chitosan. With the combined application, the effect of the soil heavy metal repairing agent is enhanced while the plane yield is improved, and the content of heavy metal, such as cadmium, in plants (especially in plant seeds) is obviously reduced.

The invention discloses a low-pollution magnesium alloy welding material and a preparation process of the low-pollution magnesium alloy welding material. The low-pollution magnesium alloy welding material comprises the following chemical compositions in percentage by weight: 5.5-6.5% of Zn, 0.1-0.8% of Nd, 0.20-1.0% of Ca, 0.1-0.9% of Mn, 0.1-0.4% of Al, 90.0-93.5% of Mg, a small amount of metal impurities, including Cu, Ni, Fe and Si. The low-pollution magnesium alloy welding material is prepared by a process comprising the following steps of: (1) smelting and casting; (2) homogenizing; and (3) hot extrusion and pulling and extracting. The low-pollution magnesium alloy welding material has the advantages of low pollution, high strength, simple preparation technology and low cost. By improving the boiling point of the magnesium alloy material, the welding dust can be reduced by more than 50% when being compared with the common magnesium alloy welding materials, and the melting deposition efficiency is higher than 80%.

The invention discloses a method for recycling cadmium from metallurgical cadmium-contained dust and a device for recycling cadmium from a cadmium-ammonia solution. The metallurgical cadmium-containeddust is subject to ammoniacal circular leaching, when the lead/cadmium molar ratio in the solution is smaller than 0.01, the circular leaching process is ended; after leaching is finished, liquid solution separation is carried out, and the cadmium-ammonia solution is obtained; the proper amount of vulcanizing agent is added to enable impurity ions in the cadmium-ammonia solution to be subject tovulcanization precipitation separation. After impurity removal, liquid is placed in an ultrasonic enhancing electric strengthening replacement cadmium extraction key device to be subject to efficientcadmium extraction, and high-grade sponge cadmium and zinc-ammonia solution can be obtained. The sponge cadmium can be directly used for briquetting distillation or fusion casting-electrolytic refining to obtain high-purity cadmium. The zinc- ammonia solution can be directly turned into an electric zinc system to produce electric zinc.

The invention discloses an environment-friendly rubber vulcanizing activator, and a preparation method and application thereof. The vulcanizing activator comprises, by mass, 1-6 parts of C2-C6 polyalcohol, 1-5 parts of C2-C6 fatty acid polyol ester, 2-5 parts of C8-C18 fatty acids and 1-4 parts of zinc oxide. The prepared vulcanizing activator is added to rubber instead of the zinc oxide, so thatthe crosslinking density and tensile strength of the vulcanized rubber are improved, the Mooney viscosity thereof is lowered, and the processing property and wear resistance thereof are improved; meanwhile, the zinc content is reduced by 50-62% as compared with that of a zinc oxide vulcanizing system.

The invention relates to a method for treating and recycling copper-zinc sulphide ore separation waste water. Aiming at the copper-zinc sulphide ore separation waste water, the mode of combining a vulcanization sedimentation method and a coagulating sedimentation method is adopted, that is, the waste water is fast stirring through a precipitator sodium sulphide and a flocculant PAC, then a flocculant CH2710 is added, slow stirring is carried out, after coagulating sedimentation is carried out, toxic and harmful substances in the ore separation waste water are greatly reduced, and on the contrary, the zinc concentrate recycling rate can be increased, and the zinc content in copper concentrate can be reduced. Meanwhile, consumption of part of flotation reagents can be reduced, and the production cost is reduced.

The invention discloses a green recovering technique for pickled vegetables, which comprises the following steps: cleaning the pickled vegetables, preprocessing with the dilute alkali and the solution containing Ca<2+>, processing with a green recovering solution containing Zn<2+>, rinsing, packaging, sterilizing and cooling. According to the green recovering technique provided by the invention, the color of the pickled green vegetables can be effectively recovered, the excellent color and appearance can be kept and the heavy metal ion Zn<2+> is prevented from exceeding standard.

The invention provides a process for the removal and recovery of zinc from an aqueous process stream. In particular, the process of the invention is useful in the removal and recovery of zinc compounds such as zinc chloride from an aqueous effluent stream produced in various manufacturing processes such as the manufacture of sorbic acid.

The invention provides a method for effectively removing magnesium ions from a zinc sulfate solution of electrolytic zinc. The method comprises the following steps: adding hydrofluoric acid in the zinc sulfate solution for producing electrolytic zinc according to a mass ratio of Mg to HF being 24:(35-38), adding an alkaline zinc-containing material until the pH value of the zinc sulfate solution is 3-5.2, and performing fluorination precipitation to remove magnesium; introducing saturated vapor at the pressure of 0.1-0.6Mpa, or heating to 110-160 DEG C, and boosting to 0.1-0.6Mpa, and insulating for 2-6 hours to condense, agglomerate and grow the magnesium fluoride precipitate in the mixture into particles by heating and pressurizing; decompressing, cooling and separating to obtain magnesium fluoride particles which cannot block a filter cloth or filter screen in the separating process. The method can solve the problem that magnesium fluoride precipitate which is a colloidal substanceblocks a filter cloth or filter screen and cannot realize solid-liquid separation and enables zinc fluoride to break coating of the magnesium fluoride, so that zinc loss can be reduced, and cost can be reduced.

The invention relates to a treatment method for zinc oxygen pressure leaching solution. The treatment method includes the steps that neutralizing precipitate is added to the zinc oxygen pressure leaching solution, reaction is carried out until the pH value of the solution is 4-5, and the neutralized solution and gypsum slag are obtained; the gypsum slag is washed to obtain washing water; a mixtureis obtained by mixing partial neutralized solution with the washing water, then lime is added to the mixture, reaction is carried out until the pH value of the mixture is 7-8, and neutralized precipitate is obtained; and wherein, the neutralized precipitate comprises a hydroxide containing CaSO4 and zinc. According to the treatment method for the zinc oxygen pressure leaching solution, neutralizer (hydroxide of zinc) is self-circulation, additional zinc-containing materials adding to a production system is not required, the zinc content used as the zinc hydroxide neutralizer is approximately10% of that of the main production system, the zinc-containing content of the gypsum slag is greatly reduced, the required lime quantity is little, the neutralized precipitate is prepared by mixing the lime with the neutralized solution and the washing water, and the problem of zinc enriching and recovering in the washing water is solved.

The invention discloses a beneficiation method for a complex sulfide ore containing marmatite. The beneficiation method comprises the following steps that a raw ore is ground and subjected to magneticseparation, so that the marmatite and magnetic separation tailings are obtained; zinc flotation is carried out on the marmatite so as to obtain a zinc concentrate; and sequential priority flotation is conducted on the magnetic separation tailings. According to the method, not only the zinc content in a copper (lead) concentrate is greatly reduced, the zinc recovery rate is improved, but also theusing amount of a flotation reagent is reduced, and the pollution to the environment is reduced.

The invention belongs to the technical field of experimental animals and particularly relates to a preparation method of mouse zinc deficiency model feed. The method comprises: weighing basal feed accurately and 2% cholesterol for mixing; adding grease with a heat ratio of 40% for stirring; adding moisture for stirring and mixing, and carrying out granulation with a granulation machine to obtain soft particle feed; and carrying out low-temperature moisture drying to obtain the model feed of mouse zinc deficiency. The invention also provides the mouse zinc deficiency model feed and applicationthereof. In the research, through analysis of raw material components and process improvement, the zinc deficiency feed nearly containing no zinc is prepared, and the model feed in current zinc deficiency disease research is solved. A mouse is fed only with the pure feed without use of a gavage method, so a mouse zinc deficiency model is obtained. Animal ethics are satisfied.

The invention relates to a beneficiation activating agent for sphalerite and marmatite and a method for reducing zinc in iron ore concentrate through flotation. The activating agent is amino acid or a mixture containing the amino acid, wherein the amino acid is one or more of asparaginic acid, asparaginic acid hydrochloride, glutamic acid, glutamic acid hydrochloride, threonine and serine. According to the method for reducing zinc in iron ore concentrate through flotation by using the activating agent, the activating agent is added into low-intensity magnetic separation iron ore concentrate pulp, then a collecting agent and a foaming agent are added, one-time roughing and one-time concentration are carried out, sphalerite and marmatite are floated out, the zinc content in the obtained iron ore concentrate is as low as 0.02% or below, and the iron loss amount is smaller than 5%. According to the invention, the problems that conventional activating agents of sphalerite and marmatite are poor in activating selectivity, zinc impurities in the iron ore concentrate are difficult to deeply remove, and the iron loss in the zinc reducing process is large are solved, the method is simple, easy to operate and good in zinc reducing effect, the zinc content can be reduced to 0.02% or below, and the requirement of the high-purity iron ore concentrate for the content of the zinc impurities is met.

The invention discloses an environment-friendly treating agent for wastewater containing zinc and nickel and a preparation method of the treating agent. The treating agent for the wastewater comprises 4-10 parts of polyethylenimine, 3-8 parts of calcium silicate, 2-5 parts of barium chloride, 5-10 parts of hectorite, 3-7 parts of sodium polyacrylate, 4-12 parts of hydroxysodalite and 3-6 parts of sodium lignin sulfonate. The preparation method comprises following steps: (1), calcium silicate, barium chloride and hydroxysodalite are ground by a grinder; (2), 4-10 parts of polyethylenimine, 3-8 parts of calcium silicate, 2-5 parts of barium chloride, 5-10 parts of hectorite, 3-7 parts of sodium polyacrylate, 4-12 parts of hydroxysodalite and 3-6 parts of sodium lignin sulfonate are weighed and stirred uniformly, and the environment-friendly treating agent for the wastewater containing zinc and nickel is obtained. The zinc and nickel reducing rate of the prepared environment-friendly treating agent for the wastewater is higher than 75%.