67results about How to "Effective leaching" patented technology

The invention relates to a comprehensive utilization method of bauxite and particularly relates to a comprehensive utilization method of red mud. The method includes: a step of mixing the red mud with hydrochloric acid, adding the mixture into a hydrochloric acid-resistant reactor, and reacting; a step of cooling after the reaction is finished, performing solid liquid separation and washing; a step of adding the obtained solution into a sodium hydroxide solution to obtain an aluminium hydroxide precipitate, an iron hydroxide precipitate and a sodium chloride solution, performing solid liquid separation, and washing; a step of preparing the aluminium hydroxide and iron hydroxide solid into metallurgy-level aluminum oxide and high-iron slag through a simple Bayer process; a step of subjecting the sodium chloride solution to electrolysis by an ionic exchange membrane electrolytic cell to obtain hydrogen, chlorine and a sodium hydroxide solution; a step of returning the sodium hydroxide solution discharged from an ionic membrane cathode zone and recycling; and a step of returning and recycling the obtained hydrogen and the obtained chlorine. The method is obvious in environment protection effects, effectively separates aluminum, iron and silicon in the red mud, and recovers the aluminum, the iron, sodium and other useful elements, thus achieving comprehensive utilization.

The invention discloses a method for producing aluminum oxide through treatment and utilization of industrial solid wastes and particularly relates to a method for preparing aluminum oxide through treatment of coal ashes with hydrochloric acid. The method comprises the following steps: activating coal ashes; mixing the activated coal ashes with 15%-36% hydrochloric acid, wherein a molar ratio of HCl in the hydrochloric acid to aluminum oxide and iron oxide in the coal ashes is 4-9; feeding mixed serous fluid into a reactor, heating to 90 DEG C-230 DEG C, wherein reaction time is 1 hour-8 hours; carrying out solid-liquid separation after reacting and cooling to obtain aluminum chloride liquid and high-silicon residue, and evaporating, concentrating or drying to obtain crystallized aluminum chloride; decomposing the crystallize aluminum chloride to obtain crude gamma-Al2O3 and a hydrogen chloride gas; and preparing metallurgical-level aluminum oxide by gamma-Al2O3 through a Bayer process, wherein the residue is high-iron residue and can be used as a steelmaking material. According to the method, any auxiliary agent is not added, so that aluminum oxide in the coal ashes can be effectively leached out, and the leaching rate of the aluminum oxide can reach over 85%.

The invention relates to a method for recovering metallic copper in mud generated after production of a circuit board and/or treatment of electroplating rinse-waste water by using a microorganism and a special device. The method comprises the following steps: A, adding a culture medium into a reactor, inoculating a pre-cultured T.f bacteria and T.t bacteria inoculation liquid, starting a heating system and pre-culturing the mixture for 1+/-0.5 day to obtain a reaction liquid; B, adding the mud into the reaction liquid obtained in the step A with stirring, starting an aeration machine to culture the mixture for 3 to 10 days, opening a valve at the bottom of the reactor, then pumping a leaching agent which contains mud granules from the reactor with stirring, filtering the mud granules with a filter press to obtain the metallic leaching agent; and C, after extracting and condensing the metallic leaching agent obtained in the step B, allowing the metallic leaching agent to enter an electrolytic bath for electrolysis to obtain copper with the purity of over 99 percent, or directly evaporating the concentrated liquor to obtain high-purity CuSO4. The method has the advantages of simple technique, low cost and environmental friendliness.

The invention relates to the field of metallurgy and resource comprehensive utilization, in particular to a method for decomposing titanium-containing blast-furnace slag through fused salt, which has the advantages of environment friendliness, low pollution and high efficiency. The method comprises the following steps of: by taking the titanium-containing blast-furnace slag as the raw material; after ball-milling, reacting the titanium-containing blast-furnace slag with a NaOH and NaF fused salt system at 200-700 DEG C to generate a solid intermediate phase; after hydrolyzing, extraction-filtering, dissolving with acid and extraction-filtering the solid intermediate phase to obtain a metatitanic acid solution; hydrolyzing and extraction-filtering the metatitanic acid solution to obtain hydration titanium dioxide powder; and calcining the hydration titanium dioxide powder at 600-1300 DEG C to finally obtain rutile type carbon dioxide. By means of the method disclosed by the invention, alkali circulation and acid circulation in the system are realized; the production energy consumption is reduced; the production process is simplified; the equipment investment is reduced; the process operability is improved; and meanwhile, a lot of accumulated titanium-bearing blast-furnace slag is utilized; the environmental problem is solved; and the titanium resource is sufficiently utilized.

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 relates to ultrapure quartz sand and a purification process thereof. The purification process includes: preparing preliminarily washed sand; preparing a secondary particle size homogenized quartz sand product; preparing pickled quartz sand; removing impurities; preparing an ultrapure quartz sand product. The purification process has the advantages that the purification requirements of quartz sand of different metallogenic types can be satisfied, and the purity of the purified products of different quartz sand can reach 99.999-99.99999%; the purification process is simple, practical, innovative, capable of greatly increasing the purification efficiency and purity of high-purity quartz sand and evident in economic and actual application value.

The invention discloses a method for leaching niobium, scandium and rare earth elements from tailings and relates to the technical field of hydrometallurgy. The method comprises the following steps: S1, adding calcium hydroxide and sodium chloride into iron ore dressing, rare earth and fluorite tailings, uniformly mixing to obtain a mixture, and roasting the mixture to obtain roasted ore; S2, performing ball-milling treatment on the roasted ore; S3, mixing the roasted ore subjected to ball-milling treatment with hydrochloric acid, heating for leaching, and filtering an extract to obtain a leaching residue I and a leaching liquor I rich in rare earth and scandium; and S4, drying the leaching residue I, leaching the leaching residue I by adoption of a concentrated sulfuric acid heating leaching method, and filtering an extract to obtain a leaching residue II and a leaching liquor II rich in niobium. The method is simple to operate, low in energy consumption, green and environmentally friendly, and low in process cost, can effectively leach niobium, scandium and rear earth in the iron ore dressing, rare earth and fluorite tailings, and is high in leaching rate of niobium, scandium and rear earth.

The invention relates to the field of life, in particular to a washing method of a roller washing machine. The method includes the following steps that S1, detergent is acquired, and soaking water is injected into a washing cavity; S2, washing water is injected into the washing cavity for the first time after soaking is performed for a preset period of time; S3, a roller is controller to rotate, clothes are washed for the first time, and the washing water is discharged; S4, detergent is acquired again, and washing water is injected into the washing cavity for the second time; S5, the roller is controlled to rotate, the clothes are washed for the second time, and the washing water is discharged. The method includes the soaking step and the washing step. Warm water and the detergent are mixed for soaking, blots attached to the clothes can be effectively leached, washing is performed two times, the first time of washing is used for separating dirt from the clothes, the second time of washing is used for immersing the clothes in fragrance factors of the detergent while the clothes are cleaned, and the washed clothes smell fragrant.

The invention relates to a biology and chemical method to remove the impurity iron in bauxite ore. The feature is that it adopts fermentation liquor leaching out iron of aspergillus niger bacterium that has strong ability to produce acid. 1-4% vitriol is added into the fermentation liquor as leaching out agent. After process by the method, the ferric oxide content is 0.4-0.9% and the aluminum leaching out ratio is less than 1.0%.

The invention discloses a method for leaching manganese from manganese-rich slag. The method comprises steps that: (a) the manganese-rich slag is mixed with metallurgy manganese and pyrite powder, such that manganese-rich mixed powder is obtained; (b) a sulfuric acid solution and the manganese-rich mixed powder are mixed, such that a slurry is obtained; (c) the slurry is stirred, and is simultaneously processed through pressure leaching; the leached slurry is filtered, such that a leachate and filter residue are obtained. According to the method provided by the embodiment of the invention forleaching manganese from manganese-rich slag, simultaneous leaching of low-silicon low-grade metallurgy manganese can be realized while filtering is carried out. Also, because a pressure leaching technology is adopted, the leaching efficiency is greatly improved. According to the method provided by the embodiment of the invention for leaching manganese from manganese-rich slag, higher than 90% of manganese can be leached from the manganese-rich slag. Also, the method provided by the invention is advantaged in simple technology, high feasibility, and substantial effect.

The invention discloses a fractional precipitation method for extraction of aluminum, silicon, iron and calcium elements in fly ash, and the method comprises (1) the fly ash activated by roasting is leached by hydrochloric acid, and then filtered to obtain filter residue and filtrate, and the filter residue is further processed to obtain white carbon black; (2) the pH value of the filtrate obtained by the step (1) is adjusted to 1.5 - 3.5, then filter residue and filtrate are obtained by precipitation and filtering, and an iron compound is obtained by washing and drying of the filter residue; (3) the pH value of the filtrate obtained by the step (2) is adjusted to 3.8 - 5.2, then filter residue and filtrate are obtained by precipitation and filtering, and aluminum hydroxide is obtained by washing and drying of the filter residue, and then metallurgical grade alumina is obtained by further calcinations; and (4) calcium chloride dihydrate is obtained by evaporating of the filtrate obtained by the step (3), and anhydrous calcium chloride is obtained by further calcinations. Through use of the method, fractional extraction of the aluminum, silicon, iron and calcium elements in the fly ash can be realized, and the extraction rates are more than 70%. At the same time, the method is simple in process and low in cost.

The invention relates to a method for restoring an ionic rare earth ore ammonium salt leaching site, which comprises the steps of carrying out primary leaching by using a calcium and/or magnesium-containing salt solution and carrying out secondary leaching by using a calcium-containing alkaline aqueous solution or slurry, so that reinforced leaching of residual ammonium salt in the ammonium salt ore leaching site, controllable adjustment of the pH value, in-situ chemical curing of sulfate radicals and rapid regulation and control of the content of calcium and magnesium nutrient elements can be achieved, the used leaching water amount is small, the leaching period is short, the leaching effect is good, the technology is simple, the cost is low, and a solid technical guarantee can be provided for ion type rare earth ore ammonium salt leaching site restoration and eco-friendliness.

The invention belongs to the field of enzyme activity inhibition and in particular relates to a method for lowering the activity of autolytic enzymes of sea cucumbers by ultrasonic-assisted electrolyzed water. The method comprises the following steps: preprocessing, performing ultrasonic-sub-acidic electrolyzed water treatment, performing secondary impurity removal, and packaging for storing or subsequently processing. The purposes of changing the internal pH value of the sea cucumbers and lowering the activity of the autolytic enzymes of body walls and intestinal tracts of the sea cucumbers are achieved through the ultrasonic-assisted sub-acidic electrolyzed water treatment. The method has the advantages that the sterilization effect is remarkable, the dissolving-out quantity of TCA-soluble oligopeptide, total sugar and reducing sugar is low, and the enzyme activity survival rate of the autolytic enzymes is lower than 15%.

The invention provides a dry-process firing method of bauxite with low aluminum-silicon ratio. The method comprises the following steps: dosing and mixing the limestone powder, bauxite powder, sodium carbonate and evaporation-return recycled alkaline solution; sintering in a rotary kiln; cooling the sintered clinker and levigating; adding adjustment liquid into the clinker powder for dissolving out; performing reverse sufficient washing of the slag dissolved out of the clinker powder for 5-7 times, wherein the washing liquid is used as adjustment liquid while the slag is piled; mixing the solution dissolved out of the clinker powder with sodium aluminate crystal for dissolution, and desiliconizing; performing seed decomposition; and performing evaporation and salt elimination of the seed mother liquor by two steps. In the method provided by the invention, for the bauxite with low aluminum-silicon ratio, the sintering raw material is combined with appropriate limestone and sodium carbonate so that the sintered clinker powder can be effectively leached; the dry-process firing conditions are controlled so that the technological process of the sintering process is shortened by over one third, the seed composition rate is improved by 90% or over, and the total recovery rate of aluminum oxide is 90% or over.

The invention relates to earthworm lotion which comprises surface active agents and nutrient substances. The earthworm lotion is safe to use, and earthworm epidermal mucus can be effectively extractedwithout affecting earthworm health.

The invention discloses a comprehensive utilization method of a roasted gold concentrate The comprehensive utilization method of the roasted gold concentrate comprises the following steps of strippinggold, leaching the gold, filtering, adsorbing, and post-treating an adsorption solution. The comprehensive utilization method of the roasted gold concentrate comprises the concrete steps of utilizingdiluted hydrochloric acid as a leaching agent, effectively stripping the gold in the gold concentrate, filtering, adding activated carbon into a filter liquor, and obtaining gold-loaded carbon and the adsorption solution; and conventionally desorbing and refining the gold-loaded carbon, adopting a fractional precipitation method on the adsorption solution to obtain precipitates such as iron phosphate and copper sulphide, filtering, adding ammonium hydroxide into the filter liquor, and obtaining an ammonium chloride product. The method is simple in whole technological process, easy to operate,and free of pollution, the gold leaching rate and the valuable metal recovery rate are effectively improved, and the solid wastes are reduced.

The invention provides a method for recovering tellurium in copper anode slime through normal-pressure closed oxygenation. The method comprises the following specific steps: adding a dilute sulphuric acid-dilute nitric acid mixed acid into copper anode slime for pulp blending, wherein the weight-volume ratio of copper anode slime in the blended pulp is controlled to be 15-25 g/mL, the dilute sulphuric acid content of the mixed acid is controlled to be 0.5-2 mol/L, and the dilute nitric acid content of the mixed acid is controlled to be 0.03-0.1 mol/L; placing the blended pulp in a closed container, introducing oxygen into the closed container for air removal, carrying out 0.5-1.5 hours' leaching under normal pressure, and then carrying out solid-liquid separation, wherein the leaching temperature is 100-115 DEG C, and the rotating speed of stirring is 300-500 r/min. The method provided by the invention has the advantages of being high in leaching rate, safe, reliable, and easy to handle; the tellurium leaching rate reaches 97.6-99.8%; moreover, the method is low in energy consumption and requirement for reaction equipment, the cost can be reduced, and the industrialized recovery of the element tellurium in copper anode slime is facilitated.