44results about How to "Shorten the leaching cycle" patented technology

The invention discloses a microwave processing device for the dump leaching uranium ores. The device uses microwave to carry out irradiation to dump leaching uranium ores, due to the fact that differences exist among the microwave temperature rising effects of different minerals inside the uranium ore particles, heat stress differences are generated among the different minerals inside the uranium ore particles, the grain boundaries of the different minerals inside uranium ore particles break and the cracks inside the particles extend, therefore the poriness of the uranium ore particles is increased, the permeability of the inner portions of the uranium ore particles is improved, the dissociation degree of the uranium ores is improved, the leaching efficiency of the dump leaching of the uranium ores is improved, and a leaching period is shortened. The whole equipment comprises 16 microwave units, a material conveying system, a support, a temperature detecting and controlling system and a microwave suppressor. When the microwave processing device for the dump leaching uranium ores is used to process the dump leaching uranium ores, the microwave processing device has the advantages of being good in the matching of microwave power and the uranium ores, low in processing energy consumption, large in processing quantity, stable in material conveying, and small in microwave leakage, the poriness of the uranium ores and the dissociation degree of the uranium ores are further improved, the leaching efficiency is further improved, and the leaching period is further shortened and the like. The microwave processing device for the dump leaching uranium ores is also suitable for the processing of dump leaching gold ores, dump leaching copper ores and other dump leaching ores, and has obvious effect in increasing poriness of ore particles, improving the permeability of the inner portion of the ore particles, improving the dissociation degree of useful ores, improving leaching efficiency, and shortening leaching efficiency.

The invention discloses a rare earth in-situ leaching and enriching process for ionic rare earth ore. The rare earth in-situ leaching and enriching process comprises the following steps: step 1, injection an ore leaching agent and a shrinkage agent into ore body, and performing sited and in-situ ore leaching to enable 'ion-phase' and part of 'other-phase' rare earth to leach out to obtain a mother liquor; step 2, pumping an impurity removal agent I into the medium and high-concentration mother liquor for impurity removal, precipitating through a precipitator, washing with clear water, filtering, and firing to obtain a solid rare earth product, wherein the impurity removal agent I is a mixed solution of a sodium bicarbonate solution and a sodium carbonate solution, and the precipitator is a sodium bicarbonate solution; and pumping an impurity removal agent II into the low-concentration mother liquid for neutralization to remove aluminum impurities, pumping ion exchange columns into the mother liquor from which aluminum is removed for adsorptive enrichment of rare earth ions, and desorbing with acid to obtain a liquid rare earth product, wherein the impurity removal agent II is lime cream. The independently researched and developed brand-new agents are used together with the whole set of innovative technology to achieve the purposes of significant change of the ionic rare earth extraction process, comprehensive optimization of technical-economic indicators and friendly ecological environment.

The invention discloses an efficient sulfur-oxidizing bacteria with a strain name of Acidithiobacillus thiooxidans Retech DW-II. The strain is preserved in China General Microbiological Culture Collection Center, Institute of Microbiology of the Chinese Academy of Sciences, No.3, Court No.1, Beichen West Road, Chaoyang District, Beijing on September 10, 2014, and has accession number of CGMCCNo. 9625. The invention also provides a rapid heating method for low-sulfur copper mine leaching process in Alpine region. The method comprises the steps of: crushing ore to -50mm, mixing with pyrite powder, conducting sulfuric acid slaking and granulation to improve the permeability of the stock heap and provide sufficient energy for bacteria; and finally adding the efficient sulfur-oxidizing bacteria CGMCC No. 9625. The method speeds up the initial rate of oxidation of the pyrite ore heap, and provides sufficient heat for the stock heap, so that temperature of the stock heap rapidly increases to above 40 DEG C.

The invention discloses autotrophic and heterotrophic compound ore-leaching flora FIM-Z4 and application thereof and provides a mixed culture FIM-Z4 of acidithiobacillus ferrooxidans, acidithiobacillus thiooxidans and acidiphiliu acidophilum; the preservation number of the mixed culture FIM-Z4 is CGMCC No.11190. Through synergistic effect, the leaching reaction kinetics is improved obviously, the reaction speed is increased, the leaching period is shortened, and the leaching rate and leaching yield of metal (copper and nickel) ions in target ore are increased. The heterotrophic compound ore-leaching flora FIM-Z4 is a compatible whole, and the population ecology keeps relatively stable in a long-term domestication process. The heterotrophic compound ore-leaching flora FIM-Z4 is applied to biological metallurgy and has a better leaching effect on copper ions in low-grade copper sulphide ore and nickel ions in low-grade nickel ore.

A biological extracting technology for the ore or ore comcentrate or tailings of sulfide containing alkaline vein rock includes separating and culturing the bacterial mixture of thiobacillus ferrooxidan and microspirillum ferrooxidan in 9K culture medium, naturalizing culture in the water in which said ore to be extracted and pyrite ore or sulfur are immersed, enlarge culture, mixing the ore tobe extracted with pyrite ore and sulfur powder, stacking, and showing the bacteria contained high-Fe liquid for extracting metal. Its advantages are short period, high extracting speed and rate, and low cost.

The invention discloses a method for bath leaching and extracting nickel and cobalt from garnierite, comprising the following steps of: (1) crushing the garnierite into ore particles; (2) placing the ore particles in a leaching bath; (3) throwing a leaching agent from a liquid inlet at the top of the leaching bath for soaking the ore particles, wherein the ore particles must be immersed in the liquid level of the leaching agent; (4) discharging a leaching liquid from a liquid outlet at the bottom of the leaching bath; and (5) preparing a novel leaching agent and repeating the step (3) and the step (4) until the nickel content in the ore is lower than a preset value. The method is short in process and simplicity in operation, involves less equipment, and can be used for making the leaching period shortened to about 30 days, leading the nickel leaching rate to reach over 80 percent, and enabling the leaching liquid to have a good permeability. Moreover, the prices of used related materials, the acid consumption and the production cost are low.

A method is disclosed against the technical problems of long pump leaching period and low molybdenum leaching rate of low grade molybdenite. A granulation pelletizing technology is used to fully expose molybdenum in molybdenite and realize ultrafine particle molybdenite pump leaching, and an alkali mixing slaking reinforcement technology is used to increase the reaction speed and rate of a leaching agent with the target element in order to shorten the leaching period and improve the leaching rate of the target product. The method simplifies the floating-roasting-stirring leaching grinding process of traditional methods, avoids pollution of SO2 to air, optimizes Method for Recovering Molybdenum through Dump Leaching of Low Grade Molybdenite, and realizes further improvement of the resource recovery rate, reduction of the running cost and improvement of the economic exploitation values of the low grade molybdenite through the granulation pelletizing technology and the alkali mixing slaking reinforcement technology.

The invention discloses an ion adsorption type rare earth ore mining and environmental governance integrated method which comprises the following steps: an underground water level control technology: in combination with a hydrological cycle process of a mining area, forming liquid injection holes for injecting a leaching agent in a rare earth ore body distribution section, and forming liquid extraction holes for extracting rare earth leaching liquid in an underground water collection area; a rare earth mining technology from bottom to top: punching the liquid injection holes to penetrate through the ore body, leaching the middle lower part of the rare earth ore body, and then leaching the upper part of the ore body; a mining area elution technology: injecting eluent through the liquid injection holes, conducting circular elution on the residual leaching agent in underground water, and recycling low-grade rare earth; and a monitoring technology: after the elution technology is completed, reserving and converting part of the liquid extraction holes into long-term monitoring holes for environment monitoring so that the local environment can be monitored for a long time. According to the ion adsorption type rare earth ore mining and environmental governance integrated method, rare earth ore mining and ecological environmental governance are integrated into a unified technology system, mining and environmental governance can be completed at the same time, and the phenomenon that governance is conducted after pollution occurs is avoided.

The invention discloses a secondary bioleaching continuous process for efficiently removing heavy metal chromium from leather making sludge. The secondary bioleaching continuous process comprises thefollowing steps: adding microflora, a microorganism energy substance and sludge to be treated into a first-level reactor and a second-level reactor respectively, supplementing to working volume with water, and meanwhile starting the first-level reactor and the second-level reactor; carrying out a bioleaching reaction on the first-level reactor and the second-level reactor; when the pH values of the first-level reactor and the second-level reactor are lower than a set value, draining the sludge bleached in the second-level reactor by a certain volume, and supplementing sludge in the first-levelreactor for reacting continually; supplementing the sludge bleached in the second-level reactor and the sludge to be treated containing the bioenergy substrate into the first-level reactor for reacting continually; repeating the step 3 and the step 4 to realize continuous bioleaching reaction for removing chromium. By adopting the secondary bioleaching continuous process, corresponding reaction environments can be provided for different microorganisms, the long-term continuous running of the bioleaching reaction is promoted, and the engineering application of the bioleaching process is realized.

The invention provides a sulfur and arsenic containing difficult-to-treat gold mine gold extraction method. According to the method, firstly, solid active carbon is added for enhancing bacterial oxidation pretreatment; then, after the ore pulp concentration and the pH are regulated, active carbon adsorption is performed for leaching gold. At the biological oxidation stage, the dosage of the solid active carbon is 6g/L to 10g/L; the granularity range is 1mm to 5mm; under the effect of the solid active carbon, the oxidation time of sulfur and arsenic containing difficult-to-treat gold mine biological leaching is greatly shortened; the leaching rate is greatly improved; after the pre-oxidation is completed, the ore pulp concentration and the pH are regulated, and the gold leaching is directly performed; gold and arsenic are recovered through analysis after the gold leaching. The method provides important theoretical and technical guidance for sulfur and arsenic containing difficult-to-treat gold mine biological pre-oxidation and gold leaching.

The invention belongs to the technical field of in-situ leaching uranium mining, and particularly relates to a using method of an organic chlorine oxidant in neutral in-situ leaching uranium mining. Carbon dioxide and oxygen are injected into groundwater to prepare a leaching agent, and the pH value of the leaching agent is controlled to be 6.8-7.5; the concentration of the leach liquor uranium does not increase any more when reaching a peak value, and the oxygen stops being added; sodium dichloroisocyanurate is added as an oxidant, the prepared sodium dichloroisocyanurate solution is added into a liquid injection main pipe through a metering pump, and the mass concentration is 200-300 mg/L; the free chlorine concentration of a leach liquor is monitored, and when the free chlorine concentration is greater than 20 mg/L, the mass concentration of the oxidant sodium dichloroisocyanurate is reduced to 30-40% of the original concentration, namely, 60-120 mg/L; when the leaching rate of a block section is greater than 70%, the oxidant stops being added until the leaching process is finished. The using method can overcome the defect that the neutral leaching uranium mining adopts the oxygen as the oxidant, the tetravalent uranium in the ore is effectively oxidized, the concentration of the leach liquor uranium is improved, and the leaching period of the ore is shortened

A method for enhancing biological oxidation of arsenic-containing gold ore through potential regulation and control is disclosed. The method includes (1) subjecting the arsenic-containing gold ore tofine grinding to obtain ore powder; (2) preparing a 9K medium; (3) adding the ore powder obtained in the step (1) and thiobacillus ferrooxidans into the 9K medium prepared in the step (2), performingprimary biological leaching to obtain primary ore pulp, then adding a Fe<3+> solution to adjust the potential of the primary ore pulp, adjusting the pH of the primary ore pulp at the same time, and performing secondary biological leaching to obtain secondary ore pulp; and (4) after the secondary biological leaching in the step (3) is finished, subjecting the secondary ore pulp to solid liquid separation to obtain gold leaching slag. The method can significantly shorten the leaching period, is high in treatment efficiency and simple to operate, and can be widely used in ore enterprises of various sizes.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for leaching copper and gold in a waste circuit board by utilizing a micro-electric field to strengthen phanerochaete chrysosporium. The method comprises the following steps: firstly, carrying out self-immobilization culture on phanerochaete chrysosporium; then adding the sterilized waste circuit board powder into an electrolysis container containing cultured fungus liquid, and performing direct-current micro-electric field enhanced leaching for 6-10 days; and finally, recycling copper and gold from the microbiological leaching liquid through an extraction-reverse extraction-electrodeposition method and an activated carbon adsorption method. After the combined action of the micro-electric field and the phanerochaete chrysosporium, the average leaching rates of copper and gold in the waste circuit board are 70.90% and 38.64% correspondingly. In a fungus leaching system without applying the micro-electric field, the average leaching rates of copper and gold of the waste circuit board are 44.54% and 27.53% correspondingly. The method has the advantages that the leaching rate of copper and gold is obviously improved after micro-electric field strengthening, and the leaching period is shortened by at least 4 days.

The invention provides a whole utilizing method of an arsenious gold fine mine. The whole utilizing method comprises the following steps of (1) performing crushing, milling and acidification on a goldmine; (2) performing bacteria preoxidation on the gold mine subjected to crushing, milling and acidification, and adding an arsenic adsorbing agent to the bacteria preoxidation system; (3) performingthickening treatment to obtain an upper floating layer, clear liquid and an underflow; (4) performing neutralizing, cyanation and lixiviating on the underflow for recovery of gold; and (5) recoveringarsenic from the upper floating layer. Through the adoption of the whole utilizing method disclosed by the invention, arsenic in the arsenious gold fine mine can be subjected to selective adsorption,and besides, the behavior of low gold leaching efficiency due to gold adsorption and taking away can be avoided.

The invention belongs to the technical field of in-situ leaching uranium mining, and particularly relates to a use method of an organochlorine oxidant in acid-process in-situ leaching uranium mining. H2SO4 is added into underground water to prepare a leaching agent, and acidification is started; a mixed solution of dichloroisocyanuric acid and trichloroisocyanuric acid is added as an oxidizing agent, the mass concentration ranges from 150 mg/L to 300 mg/L, the mass ratio of dichloroisocyanuric acid ranges from 20% to 30%, and the mass ratio of trichloroisocyanuric acid ranges from 70% to 80%; the Eh value of lixivium is monitored, when the Eh value of the lixivium is stabilized to be 550 mV or above, the mass concentration of the oxidizing agent is not changed, the mass ratio of dichloroisocyanuric acid is 60%-70%, and the mass ratio of trichloroisocyanuric acid is 30%-40%; the free chlorine concentration of the lixivium is monitored, and when the free chlorine concentration is larger than 8 mg/L, the concentration is reduced to 40%-60% of the original concentration; and when the leaching rate of blocks is greater than 80%, oxidizing agent adding is stopped, and the concentration of H2SO4 is reduced to 3.0-5.0 g/L until the leaching process is finished. According to the use method, tetravalent uranium in the ore can be effectively oxidized, the uranium concentration of the lixivium is improved, the reagent cost of the oxidizing agent is reduced, and the leaching period of the ore is shortened.

The invention provides a method for removing uranium by oxidation. The method comprises the following steps: mixing uranium-containing wastewater, pyrite and a buffer agent, regulating the pH value tobe neutral, introducing oxygen into the obtained mixed solution, and reacting. According to the method, the uranium is fixed to the surface of the pyrite through the adsorption or reduction effect ofthe pyrite, meanwhile, the uranium can also be fixed into the precipitate through iron oxide formed by oxidizing the pyrite, and therefore the purpose of removing the uranium in the uranium-containing wastewater is achieved. The method has the advantages of being simple in process, easy and convenient to operate, low in cost and capable of efficiently removing uranium, and has important theoretical guiding significance for repairing and treating the high-uranium underground water in the retired mining area of the neutral in-situ leaching uranium mining.

The invention discloses a method for extracting metal copper from copper-containing sludge on a circuit board. The method comprises the steps of adding concentrated sulfuric acid into the copper-containing sludge on the circuit board for pretreatment; adding biological bacteria liquid into the pretreated copper-containing sludge on the circuit board, and carrying out stirring and leaching to finish the solid-liquid separation; sequentially adding clear water and hydrogen peroxide into obtained leaching residue, carrying out the enhanced stirring and leaching, and then carrying out the solid-liquid separation and the washing; and extracting copper from an obtained leaching solution, and carrying out cyclone electrodeposition after back extraction to extract the metal copper. According to the method, firstly, the copper in the copper-containing sludge on the circuit board is leached by adopting a biological wet method, and then the hydrogen peroxide is added in the process for the secondary enhanced leaching, so that a leaching effect better than the single biological leaching is obtained, the maximum recovery of the copper in the copper-containing sludge on the circuit board is achieved, and meanwhile, the leaching residue reaches a harmless discharge standard and can be discharged or utilized as a harmless resource.

The invention discloses a biological-chemical two-stage circulating reactor for pretreatment of refractory gold ores, which is used for enhancing pretreatment of refractory gold ores by simultaneously using an electrochemical method and a biological leaching method and is used for improving the gold extraction rate of the refractory gold ores. Comprising a double-head air pump, two constant-current peristaltic pumps, an electrochemical reactor, an electrical stimulation bioreactor, two electric heating systems, two external electric fields, two pH and oxidation-reduction potentiometers, two thermometers, a stirrer and a filter. According to the device, biological reaction and chemical reaction in the ore leaching process are carried out separately, strengthening measures are taken for bacterial reproduction and biological leaching through direct current stimulation, the leaching period is shortened, the cost is reduced, microbiological leaching of the chemical reactor is strengthened through the electric field potential, the oxidation rate of refractory gold ore can be remarkably increased, and the leaching efficiency of the refractory gold ore is improved. And the leaching rate of gold is improved.