64results about How to "Easy to realize industrialized continuous production" patented technology

The invention discloses a process for efficiently and selectively separating copper in lead copper matte. The process comprises the following steps: smashing and grinding the lead copper matte taken as a raw material and screening to reach below 80 meshes; sending the lead copper matte which is ground and screened into a leaching tank and leaching by using a sulfuric acid; reacting for 3 to 5 hours at a normal pressure under the conditions that the oxidation potential of the solution is controlled within 450mV to 800mV, the concentration of sodium chlorate is controlled within 200g / L to 500g / L, the liquid-solid ratio is controlled within (5-15):1, the temperature is controlled within 70 DEG C to 100 DEG C and the concentration of the sulfuric acid is controlled within 1.0mol / L to 1.5mol / L; and leaching the copper under an acid condition by taking the sodium chlorate as an oxidizing agent. During the oxidizing and leaching process, sulfur in the lead copper matte is oxidized into elemental sulfur which is transferred into slags, wherein copper which is oxidized enters the solution in a form of copper ions while lead remains in the slags in a form of lead sulfate together with gold and silver. After the leaching process is finished, the solid-liquid separation is carried out, so that the primary separation of the copper and other valuable elements is realized; a certain amount of scrap iron is added into the leaching solution rich in the copper so as to replace the deposited copper, so that the spongy copper, which is a primary product, can be obtained; the leaching slags are sent into a pyrogenic lead smelting system, so that the valuable elements such as Pb and Ag are comprehensively recycled.

The invention discloses a technology for treating a high-arsenic copper material. The technology comprises the steps that the high-arsenic copper material is subjected to crushing, grinding, sodium hydroxide mixing and oxidizing leaching, copper in the high-arsenic copper material is oxidized and left in residues in a residual mode along with lead and noble metal of gold, silver and platinum, arsenic enters a solution in a sodium arsenate mode, leachate is subjected to concentration and crystallization, a sodium arsenate product is obtained, and a concentrated solution returns to be subject to oxygen-pressure alkali leaching; leached residues are subjected to sulfuric-acid atmospheric pressure leaching, copper enters the solution in a copper sulfate mode, acid adjustment is conducted, and vortex electrolysis is directly conducted for extracting copper; electrodeposited waste liquid is recycled; and lead and the noble metal enter lead and silver residues, and valuable elements of Pb, Ag and Au are comprehensively recycled. The technology belongs to a clean metallurgy process, is low in equipment corrosion-resistant requirement, free of pollution to environment, easy to operate and high in comprehensive recycling degree of metal and has the advantages of being higher in practicability and adaptability to raw materials and the like.

The invention relates to a preparing method of a spherical titanium-aluminum composite carrier. The preparing method is characterized by comprising the following steps: adding deionized water and titanium oxide into alumina gel and uniformly mixing; slowly adding an alginate solution, and stirring at high speed to prepare suspension slurry; dropping the suspension slurry into a multivalent metal cation solution to form spherical composite gel particles; and drying and roasting the gel particles to obtain the spherical titanium-aluminum composite carrier, wherein aluminum oxide hydrogel or nano aluminum oxide gel is adopted as the alumina gel; the adding amount of titanium oxide is 0.1-4 times the mass of alumina gel based on Al2O3, and the crystalline phase of titanium oxide is selected as anatase phase; the solid content of the suspension slurry is 5%-25%, and the content of alginate is 0.3%-5%; alginate is one or more of sodium alginate, potassium alginate, magnesium alginate and ammonium alginate; the multivalent metal cation solution is saline solutions containing aluminum ions, zinc ions, calcium ions, copper ions, iron ions, ferrous ions, cobalt ions, manganese ions or nickel ions, with the saturation concentration being 0.1mol / L.

The invention relates to a method for preparing polylactic acid from lactic acid under catalysis of a titanium composite catalyst, belonging to the technical field of polymer materials. The method comprises the steps of: removing water from a raw material under normal pressure by an inert gas blowing method; gradually reducing pressure for pre-polycondensing: pre-polycondensing under low vacuum degree of 1000-10000Pa and high vacuum degree of 20-1000Pa at the temperature of 60-160 DEG C for 1-10h to obtain a lactic acid prepolymer; and carrying out melt polycondensation on the lactic acid prepolymer as a raw material in the presence of the titanium composite catalyst to finally prepare polylactic acid. The method has the advantages that any organic solvent is not used, the production equipment is simple, operation is convenient, industrialized continuous production is easy to realize, and the obtained product namely polylactic acid has higher molecular weight.

The invention discloses a method for recycling valuable metal from silver electrolysis mother liquor copper deposition drags. The method comprises the steps of (1) nitric acid leaching, wherein nitricacid is added into the silver electrolysis mother liquor copper deposition drags, and leachate is obtained; (2) silver replacing with copper sheets, wherein the thoroughly cleaned copper sheets are taken and inserted into the leachate, the pH is controlled to be equal to 0.5 to 1.5, and sponge silver powder and displacement liquid are obtained; (3) valuable metal deposition, wherein Na2S is addedinto the displacement liquid for deposition of copper, bismuth, lead and other valuable metal, and metal residues are obtained; (4) valuable metal recycling, wherein the obtained metal residues are returned into a smelting system, and copper, bismuth and lead are recycled; and (5) silver recycling, wherein the sponge silver powder is cast, then a silver electrolysis procedure is carried out, andsilver is obtained. The method has the beneficial effects of being good in environmental friendliness performance, simple in process, convenient to operate, high in comprehensive recycling degree andthe like.

The invention provides a method for preparing three-dimensional block polylactic acid at high efficiency. The method is characterized by comprising the following steps of: (1) pre-polymerizing: adding polymerization-stage D type (or L type) lactide, a catalyst and an initiator into a polymerization reactor, heating to the first reaction temperature of 160-200DEG C under the protection of inert gas, reacting for 0-1hour after a set temperature is achieved, cooling to the second reaction temperature of 100-150 DEG C, and reacting for 0.5-5hours to obtain a prepolymer; and (2) carrying out block copolymerization: taking the prepolymer prepared by the step (1) as a raw material, adding the polymerization-stage L type (or D type) lactide into the polymerization reactor, wherein the mass ratio is (1:9)-(3:7), the reaction temperature is 190-230DEG C under the protection of inert gas, and the reaction time is 0.5-5hours after the set temperature is achieved, so that the three-dimensional block polylactic acid can be obtained.

The invention relates to a preparation method of a spherical silicon-aluminum composite carrier. The preparation method is characterized by comprising the following steps: adding silicon dioxide to an alumina gel, and uniformly mixing; slowly adding to an alginate solution, and uniformly stirring to prepare suspension slurry; dropping the suspension slurry into a multivalent metal cation solution to form a spherical composite gel granule; taking out the spherical composite gel granule, and drying and calcining to obtain the spherical silicon-aluminum composite carrier, wherein the alumina gel is an alumina hydrogel or a nano-alumina sol, the addition amount of the silicon dioxide is 0.1-0.3 time more than the weight of the alumina gel in terms of Al2O3, the suspension slurry contains 5%-25% by weight of solids and 0.3%-5% by weight of alginate, the soluble alginate is one or more of sodium alginate, potassium alginate, magnesium alginate and ammonium alginate, and the multivalent metal cation solution is an aluminum, zinc, calcium, copper, iron, ferrous iron, cobalt, manganese or nickel ion salt solution with the saturation concentration of 0.1 mol / L. The spherical silicon-aluminum composite carrier obtained through the preparation method disclosed by the invention has the advantages of high strength, large pore volume and low bulk density.

The invention provides a dried lycium barbarum secondary washing and drying method. After lycium barbarum is washed in a washing production line, and drying is then achieved. By means of the dried lycium barbarum secondary washing and drying method, impurities on the surfaces of the lycium barbarum are removed in the washing process according to the physical effect of water flow and the flotation performance of the dried lycium barbarum and the impurities, the lycium barbarum is not prone to being damaged, most of moisture on the surface of the washed dried lycium barbarum can be easily removed through a flexible water absorption rubber roller, secondary drying after dried lycium barbarum washing is easily carried out, and the dried lycium barbarum secondary washing and drying method is suitable for automatic industrial large-scale production. In addition, the multi-section type belt drying method is adopted, drying after secondary washing of the dried lycium barbarum is effectively achieved, the obtained product is bright in color, loose in particle, clean, sanitary and safe, the quality of the dried lycium barbarum is improved, and a new way is developed for making high-quality dried lycium barbarum.

The invention relates to a method for preparing polylactic acid from lactic acid under catalysis of a titanium composite catalyst, belonging to the technical field of polymer materials. The method comprises the steps of: removing water from a raw material under normal pressure by an inert gas blowing method; gradually reducing pressure for pre-polycondensing: pre-polycondensing under low vacuum degree of 1000-10000Pa and high vacuum degree of 20-1000Pa at the temperature of 60-160 DEG C for 1-10h to obtain a lactic acid prepolymer; and carrying out melt polycondensation on the lactic acid prepolymer as a raw material in the presence of the titanium composite catalyst to finally prepare polylactic acid. The method has the advantages that any organic solvent is not used, the production equipment is simple, operation is convenient, industrialized continuous production is easy to realize, and the obtained product namely polylactic acid has higher molecular weight.

The invention discloses a combined type automatic feeding machine tool with a loading device. The combined type automatic feeding machine tool comprises a machine tool body, hoppers, a hopper support, an accommodating frame and the loading device. The hopper support is arranged on the machine tool body, and the loading device is used for transferring the hoppers on the accommodating frame to the hopper support; the loading device comprises a loading support, a lifting mechanism, a translation mechanism and a hooking mechanism, the lifting mechanism is rotationally arranged on the loading support, the translation mechanism can reciprocate in the horizontal direction, and the hooking mechanism is used for hooking hanging portions of the hoppers; the lifting mechanism comprises lifting rods and a driving mechanism, and the lifting rods can be driven by the driving mechanism to move up and down and are rotationally arranged on the loading support; the translation mechanism comprises a positioning plate and slide rods, the positioning plate is arranged on the lifting rods, horizontal slide holes are formed in the positioning plate, and the slide rods can reciprocate along the horizontal slide holes; the hooking mechanism comprises hooks, and the hooks are arranged on the slide rods. The combined type automatic feeding machine tool has the advantages that the combined type automatic feeding machine tool comprises the loading device for transferring the hoppers on the accommodating frame to the hopper support, accordingly, the hoppers can be conveniently replaced, and industrial continuous production can be facilitated.

The invention discloses a combined automatic feeding machine tool capable of achieving hopper replacement. The machine tool comprises a machine tool body, a hopper, a hopper support, a feeding rack and a feeding device. The hopper support is arranged on the machine tool body, and the feeding device is used for transferring the hopper on the feeding rack to the hopper support. The feeding device comprises a feeding support, a lifting mechanism rotationally arranged on the feeding support, a translation mechanism doing reciprocating motion in the horizontal direction, and a hooking mechanism for hooking the hanging portion of the hopper. The lifting mechanism comprises a lifting rod and a driving mechanism for driving the lifting rod to do vertical motion. The lifting rod is rotationally arranged on the feeding support. The translation mechanism comprises a locating plate and a sliding rod, the locating plate is arranged on the lifting rod and provided with a horizontal sliding hole, and the sliding rod can do reciprocating motion along the horizontal sliding hole. The hooking mechanism comprises a hook arranged on the sliding rod. Due to the fact that the combined automatic feeding machine tool is provided with the feeding device for transferring the hopper on the feeding rack to the hopper support, the hopper can be conveniently replaced, and industrial continuous production can be achieved easily.