309results about How to "Improve leaching effect" patented technology

The invention relates to a method of taking mulberry leaves as the raw materials to continuously extract the active ingredients of alkaloids, flavonoids and polysaccharides. The invention includes the following steps: the solvents of 20 percent to 90 percent ethanol or 10 percent to 90 percent acetone are selected for reflux extraction to obtain the filtrate and filter residue; the filtrate is concentrated and dissolved by adding water, the flavonoid compounds with the content of 30 percent to 50 percent are obtained by macroporous resin separation; the solution is treated by ion exchange resin separation to get the alkaloid compounds with the content of 40 percent to 60 percent after passes through the macroporous resin; the filter residue of the mulberry leaves is boiled and decolored by using the water, and the acid polysaccharide compounds with the content of 55 percent to 85 percent are obtained by 10 percent to 60 percent alcohol sedimentation. The invention continuously and efficiently separates three active ingredients of alkaloids, flavonoids and polysaccharides of the mulberry leaves by one-time feeding, all the steps are not disturbed mutually, the extraction rate is high, the process operation is simple, the cost is low, and the invention is conductive to industrial popularization and application.

The invention discloses a method for treating high magnesium laterite-nickel ores. The method comprises the following steps of preliminary treatment of ore, pressurized leaching, iron purification of leach solution, deposition of nickel and cobalt, condensation and crystallization, production of light magnesium oxide by low-temperature thermal decomposition of crystals and regeneration of nitric acid. Under mild conditions of low temperature and pressure, leaching ratios of nickel and cobalt both reach 95 percent, the leaching ratio of magnesium reaches 98 percent, the iron content in the leach solution is less than 1g/L, and no silicon dioxide is leached out. The method can fully recover nickel, cobalt and magnesium, and the magnesium is generated in the form of light magnesium oxide, and the leaching agent-nitric acid can be recovered and regenerated for n, thereby better resolving the problems of highly efficient leaching-out of nickel and cobalt and reasonable utilization of magnesium; moreover, the technical flow is simple and has low requirements on equipment, and in the process of leaching out, the scab phenomenon does not occur in a high-pressure pan, so that the method is applied to the large-scale industrial production.

The invention discloses a nepouite with the multi-stage reverse-current acid-dipping technology, which comprises the following steps : grinding the nepouite; reacting with mixing the primary immersion liquid and water; reacting the leach residues a plurality of times endlessly; getting the K extract after finishing filtering the reaction of the k times; making the K extract liquor and the K extract react cyclically the k+1 times; regarding the k extract liquor as the extract liquor of the k-1 leaching reaction; regarding a corrosive acid as the extract liquor of the last leaching reaction; regarding the last extract liquor as a liquor containing Ni and Mg after n times reaction (k is between 1 and n and n is not less than 2). The invention reduces the cost, which recovers the Ni and Mg highly effectively.

The invention discloses a method for treating a low-grade zinc oxide ore by using a weakly alkaline amino acid salt system, which comprises the following steps of: grinding the complex low-grade zinc oxide ore, and performing cooperated leaching in the weakly alkaline amino acid salt system under the certain condition to ensure that zinc, lead, cadmium, copper, nickel and the like are dissolved in leachate and calcium, magnesium, iron, silicon and the like are undissolved and stay in leaching residues; adding CaO or Ca(OH)2 into the leachate to ensure that the zinc is precipitated in the form of zinc oxide and recovered, and valuable metals such as the lead, the cadmium, the copper, the nickel and the like are co-precipitated with the zinc and enriched in crude zinc oxide; and regulating the pH of solution in which the zinc is precipitated to be a certain value by using CO2, regenerating a leaching agent, returning the regenerated leaching agent for recycling, and calcining CaCO3 generated in the process of regenerating the leaching agent for recycling. The method for treating the low-grade zinc oxide ore by using the weakly alkaline amino acid salt system can be used for effectively treating various complex low-grade zinc oxide ores with high calcium, magnesium, iron and silicon content, and the operation system is mild and has small toxic and side effects on human bodies and an environment.

The invention belongs to the field of wet metallurgy, and in particular relates to a method for extracting and recovering copper and selenium from copper anode sludge by microwave treatment. The method specifically comprises the following steps of: screening to remove sandy impurities being more than 5mm in particle diameter from the copper anode sludge; adding sulfuric acid at a concentration of 20 to 500g/L to perform size mixing; controlling the weight concentration of the copper anode sludge size to be 1 to 30%; transferring the copper anode sludge size into a microwave oven; filling or adding an oxidizing agent to the copper anode sludge size; adjusting microwave frequency to be 1,500 to 3,500MHz and microwave heating power to be 120 to 700w; and performing leaching reaction for 1 to 30 minutes under normal pressure, wherein the copper is leached out in a form of CuSO4 from the copper anode sludge, and selenium is ledleaded out in the forms of H2SeO3 and SeSO3 and other forms. By adopting the method, the time of treating the copper anode sludge is shortened; the treatment capacity is increased; the removal rate of copper as well as selenium is raised; the rationality and concentricity of other valuable metals in the copper anode sludge are enabled, thus the comprehensive recovery can be performed well, and the energy consumption is reduced; in addition, special high pressure equipment is saved; and the leaching is performed at a faster speed.

The invention relates to a process for extracting vanadium from stone coal through two-section curing with concentrated acid. The process flow mainly comprises the following steps of: a), adding concentrated sulfuric acid into the vanadium-containing stone coal, and uniformly stirring; b), performing one-section curing on the mixture of the concentrated sulfuric acid and the vanadium-containing stone coal at the temperature of at least 50 DEG C; and c), performing second-section curing on the mixture subjected to the one-section curing at the temperature of at least 100 DEG C. The process has high conversion rate, saves mineral resources and has high adaptability.

The method for extracting copper from copper-bearing sulfide mineral is characterized by leaching copper-bearing mineral under the condition of introduction of oxygen and in the presence of sulfuric acid and chlorine ion, the liquid-solid ratio of leaching-out liquor is 1-8:1, primary concentration of sulfuric acid is 5-70 g/L, leaching total pressure is 200-1000 kPa, partial pressure of oxygen is 100-800 kPa, temp. is 100-130 deg.C and time is 1-4 hr. The leaching temp. and pressure of said method are low, its selectivity is good, the pyrite can not be oxidated, and the harmful impurity, for example arsenic, can be solidifed in arsenic-ion slag, so that it is a process friendly to environment.

This invention relates to a biological method for leaching ores of nickel oxide and cobalt oxide. The method comprises: leaching ores of nickel oxide and cobalt oxide by using leaching organism derived organic acid, dissociating the leaching solution containing nickel and cobalt, passing through a separation resin, and separating nickel and cobalt from the eluate by a resin to obtain nickel sulfate and cobalt sulfate products. The method has such advantages as short process, simple equipment, low investment, low cost, no pollution and high recovery rate. The method can treat low-grade ores of nickel oxide and cobalt oxide that cannot be treated by traditional separation process, thus expanding the utility range of resources and increase the recovery rate of nickel and cobalt.

The present invention relates to soil research equipment, and is especially one kind of soil eluviation simulator for laboratory use. The soil eluviation simulator includes a water feeding support, a water feeder with valve and mounted on the water feeding support, a main frame and an eluviating column fixed on the main frame and below the water feeder. The eluviating column with sampling holes is mounted detachably through a fastener on one side of the main frame, and the water feeding support is set in the slide water on the other side of the main frame. The present invention has simple structure, convenient operation, high eluviating effect, less disturbance on the soil, adjustable water feeding amount and strength, less eluviation simulating error and capacity of recovering the leached liquid.

The invention relates to a high oil-content oil material expanding prepressing leaching oil preparation method, which is characterized in that the method comprises the following steps, firstly, cleaning, cleaning oiling to remove impurities, secondly, tempering, adjusting the water content of oiling whose impurities are removed, thirdly, rolling slab, rolling oiling whose water content is adjusted into material slab, fourthly, squeezing and swelling, squeezing and swelling, the material slab, fifthly, drying, drying the material slab which is squeezed and swelled, sixthly, prepressing, prepressing the material slab which is dried to press one portion of oil, seventhly, leaching, leaching prepressed cake of the oil which is prepressed to get another portion of oil and meal from solvent extraction. A squeezing and swelling step in the invention is utilized to replace a cooking step in the existing method, which improves the quality and amounts of prepressing crude palm oil, increases handling capacity of a prepress expeller, and reduces power consumption and abrasion of a prepress expeller. The method of the invention is mainly applicable for oil preparation enterprises which utilize high oil-content oiling such as rapeseed and the like to be raw material.

The invention relates to a method for recycling gold and copper from copper-containing oxidization gold ores, belonging to the technical field of wet-process metallurgy. The method comprises the following steps: firstly, carrying out ore-grinding and pulping onto the copper-containing oxidization gold ores, regulating the pH value by using an alkaline regulating agent in serous fluid and adding a leaching agent; with a titanium-based iridium-coated ruthenium coating electrode, stainless steel or lead alloy as an anode and a graphite plate, a stainless steel plate, a titanium plate or a carbon fiber as a cathode, carrying out leaching-electrodeposition at the current density of 50 A/m<2>-200 A/m<2> under the normal temperature, wherein most of gold and part of copper in the leached-electrodeposited ores are leached out and gathered on the cathode by in-situ electrodeposition reduction; and taking out the cathode plate which is gathered with gold and copper valuable metals as an electrodeposition anode, and carrying out electrodeposition in an electrolytic cell with sulfuric acid, so that anode dissolution-cathode electrodeposition is carried onto the gathered copper, and single-substance gold is collected in the form of anode mud. The method disclosed by the invention has the characteristics of being gentle in reaction condition, simple in process method, short in process flow, low in production cost, energy-saving and synergistic, environment-friendly and the like.

The invention relates to the technical field of metallurgy, in particular to a pretreatment method for refractory gold ore with antimony and arsenic. The method comprises the steps that 1, the refractory gold ore with antimony and arsenic is broke and subjected to ball milling to form powder; 2, the powder obtained in the step 1 is added into a hermetic vertical pipe type heating furnace, neutral protective gas is introduced in, roasted ore is obtained after roasting and cooling are carried out, produced tail gas enters a tail gas collection device, collected smoke dust is leached through a mixed solution of Na2S with the concentration of 50-200 g/L and NaOH with the concentration of 20-100 g/L, solid-liquid separation is carried out, a filter residue with arsenic and a leaching solution with antimony are obtained, and the leaching solution is electrodeposited to produce metal antimony, wherein leaching time is 30-180 min, and leaching temperature is 20-95 DEG C. The pretreatment method has the advantages that the technological process is simple, operation is flexible, roasting time is short, energy consumption is low, antimony and arsenic can be synchronously removed, smoke gas is low in toxicity and small in amount, and economic and social benefits are good.

The invention relates to a gold extracting method by thiosulfate using a polyamine compound as an additive, which comprises the steps: after ores are crushed and wet-ground until the fineness is over 90 percent of -200 meshes, 0.03-3mol/dm3 thiosulfate is added to be used as a leaching agent, and then 0.0015-0.09mol/dm3 polyamine compound and 0.0015-0.03mol/dm3 copper (II) ion are added to form a complex ion to be used as an additive to be stirred and leached; and after gold ores are leached, gold from a leaching solution is recovered. The leaching solution is used to extract gold from the ores, so that the gold leaching rate is high, the process operation is simple, the control is easy, the consumption of thiosulfate is extremely low, and the compositions of the gold leaching solution are simple and are favorable for the recovery of the gold; and the application range is wide, the leaching effect is good when the pH value is between 10 and 12, the leaching speed is quick for copper-containing, carbon-containing and other refractory gold ores, quite high gold leaching rate can be maintained, and sodium cyanide and other toxic substances are not used and toxic waste is not discharged in the whole gold extraction process, so the environment is protected.

The invention relates to a method for recovering germanium from germanium-containing materials, particularly relates to a method for recovering germanium from germanium-containing materials of non-ferrous smelting industry, and belongs to the technical field of hydrometallurgy. The method comprises the steps of leaching germanium-containing materials as raw materials of which the particle sizes are 100 meshes with inorganic strong acid as an leaching agent of which the concentration is 50-120g/L and an aid-leaching agent at 35-95 DEG C and filtering to obtain a germanium-containing leaching solution, adjusting the pH value of the germanium-containing leaching solution to be 6-9, stirring and carrying out liquid-solid separation to obtain germanium residues, and calcining the germanium residues at 350-500 DEG C to obtain a crude germanium dioxide product, wherein the aid-leaching agent is one of tartaric acid, water-soluble tartrate, citric acid, water-soluble citrate, oxalic acid and water-soluble oxalate. The method disclosed by the invention has the advantages of simple process, easiness in operation, high recovery ratio of germanium, large enrichment ratio, and convenience in industrial production and application.

The invention belongs to the field of hydrometallurgy of non-ferrous metals, and particularly relates to a method for pre-treating high-impurity copper anode slime rich in noble metals. The method comprises the following special steps: adding sulfuric acid in the dried copper anode slime to mix size, placing in a microwave reactor, carrying out the microwave acid leaching for 5-30 min, performing the solid-liquid separation to obtain microwave acid leaching slag and a microwave acid leaching solution, adding dilute sulphuric acid in the microwave acid leaching slag to mix size, placing the microwave acid leaching sizing agent in a high-pressure reaction kettle under the pressure of 0.8-1.2 MPa after oxygen introducing, carrying out pressure acid leaching for 4-6 h to obtain pressure acid leaching slag and a pressure acid leaching solution, recovering gold and silver from the pressure acid leaching slag, and recovering nickel from the pressure acid leaching solution. The method adopting the technical scheme improves the recovery rate of copper, selenium, tellurium and nickel in the impurity copper anode slime, shortens the processing time of the copper anode slime, increases the processing capacity of the copper anode slime, enables the trend of the noble metals to be reasonable and concentrated, and is favorable for comprehensive recovery.

The invention relates to a leaching method of vanadium in vanadium-containing stone coal. The leaching method is characterized by comprising the following steps of: adding 98 percent of sulfate and fluorite into the vanadium-containing stone coal, adding water, controlling the liquid-solid weight ratio, leaching and filtering to obtain leachate; regulating the pH value of the leachate by using lime milk, extracting the leachate at room temperature by using 10 percent of P204 and 5 percent of TBP which are diluted by using kerosene, and carrying out back extraction on a load organic phase by using the sulfate; and after adding sodium chlorate into back extraction liquid, adding ammonia water, regulating the pH value, filtering and calcining a precipitate to obtain vanadium pentoxide. The method has simple process, high vanadium leaching rate, little reagent consumption quantity and little pollution and realizes the recycle of wastewater. The method is suitable for leaching the vanadium in the vanadium-containing stone coal.

The invention relates to a method for leaching earthy oxide copper ores, in particular to a method for microorganism-pelleting heap leaching, and belongs to the technical field of hydrometallurgy. The method is characterized in that: the earthy ores are directly screened, and fine ores with the granularity of 1.5mm are added with strain acid water and cement to prepare ore pellets with the diameter between 10 and 20 mm for heap leaching, wherein the mass concentration of sulphuric acid in the strain acid water is 3 to 10 percent, strains are mixed strains of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans, the mass ratio of the three is 4.0-5.5:2.5-3.5:1.5-2.5, the bacterial load ratio is 105 and 108/ml, the cement amount is 15 to 30kg/ton of ores; and leachate in the leaching is sprayed for closed cycle production. The method has the advantages of low investment, low energy consumption, good leaching effect, and no discharge of closed cycle, solves the problem of leaching the low-grade earthy oxide copper ores (including sulphide and oxide blend ores) by microorganism heap leaching, and overcomes the defects of long flow and high cost of agitation leaching.

The invention relates to a method for extracting gold from thiosulfate adopting ethanediamine as an additive. The method comprises the following steps that: the ethanediamineas is adopted as ligand and forms ethanediamine copper (II) complex ion with copper (II) ion, the formed ethanediamine copper (II) complex ion is used as the additive, and the thiosulfate is used as a leaching agent and is used for extracting the gold from ore pulp; and calculated by water amount, the adding amount of the thiosulfate is 0.03-3mol/dm<3>, the adding amount of the ethanediamine is 0.0015-0.09mol/dm<3>, and the adding amount of copper (II) ion is 0.0015-0.03mol/dm<3>. The leachate is used for extracting the gold from the ore, the leaching rate of the gold is high, the technique operation is simple, the control is easy, the consumption amount of the thiosulfate is extremely low, and the ingredients of the gold leachate are simple and are beneficial to recovery of the gold therein. The method has wide application range, has good leaching effect when the pH is between 10 and 12, also has fast leaching speed of gold ores which contain copper, carbon and the like and are difficult to treat, can maintain quite high gold leaching rate, and the whole gold extracting process does not use toxic substances of sodium cyanide and the like, also does not discharge toxic waste, and is environment-friendly.

The invention relates to a polyethylene glycol-microwave assisted almond protein extraction method, which adopts degreased almond powder as a raw material, and makes use of polyethylene glycol-microwave assisted extraction, isoelectric point-ethanol co-precipitation and vacuum freeze-drying to extract almond protein. Polyethylene glycol is a novel green solvent, has a solubilization effect on effective ingredients of almond protein, can improve the leaching efficiency and the extraction rate, and has no toxicity. Microwave-assisted extraction has the characteristics of high thermal efficiency, rapid and uniform temperature rising, greatly improved almond protein extraction efficiency, as well as shortened extraction time. Moreover, the almond protein has the advantages of high purity, high precipitation rate, simple extraction method, short extraction time, and environmental friendliness.

The invention discloses a method for leaching weathering crust illuviation type rare earth ore by using microorganisms. The method for leaching the weathering crust illuviation type rare earth ore by using the microorganisms comprises the following steps that (1) the microorganisms are activated and cultured to obtain a bacterial suspension; and (2) weathering crust illuviation type rare earth is leached by adopting the bacterial suspension, thalli or metabolites without the thalli as a leaching medium to obtain a leaching solution containing the rare earth. The microorganisms selected in the method for leaching the weathering crust illuviation type rare earth ore are environmentally friendly and safe, generally exist in nature and are wide in source, and some microorganisms are beneficial to environmental pollutant degradation and ecological restoration and improvement; and the metabolites generated in the microbial leaching process generally contain functional groups such as hydroxyl and carboxyl, the surfaces of microbial cell membranes or cell walls can also contain active ingredients acting with the rare earth, rare earth elements can be leached through complexation and chelation, the leaching effect is good, the selectivity is strong, the impurity dissolution is less, the cost is low, and the process is green and environment-friendly.