65results about How to "Increase leaching rate" patented technology

The invention discloses an auxiliary leaching agent applied to the ion-absorbed rare earth ore leaching process and an ore leaching method of the auxiliary leaching agent. The auxiliary leaching agent is a water-soluble surface active agent. Ore leaching liquid prepared through mixing of a leaching agent and the auxiliary leaching agent is used for leaching ion-absorbed rare earth ore, stable rare earth complex can be formed, moistening of the surface of soil is facilitated, and the leaching effect is strengthened. Meanwhile, due to the adding of the auxiliary leaching agent in the ore leaching liquid, clay hydration expansion and particle transferring can be effectively inhibited, and the effect of soil expansion preventing is achieved. The auxiliary leaching agent is used in the ion-absorbed rare earth ore leaching process, the rare earth leaching rate is increased, the use amount of the leaching agent is reduced, production cost is reduced, and ammonia nitrogen pollution is reduced; and in addition, the function of preventing soil expansion is achieved, and the probability of landslides is reduced.

The invention discloses a method for preparing chromium salt. The method is characterized by comprising the following steps: sufficiently and uniformly mixing a raw material containing chromium oxide (chrome ore or chromium slag) with sodium carbonate, carrying out oxidizing roasting at the roasting temperature of 900-1100 DEG C for 0.5-2.5 hours in an atmosphere with the oxygen content of higher than 20% by using microwaves as a heat source, leaching the roasted product with water, and preparing chromium salt from the leach solution. The chemical analysis on the clinker and leaching slag indicates that the insoluble waste slag contains less than 5% of chromium (on the basis of chromic oxide). The method reduces the chromium content in the discharged chromium slag, enhances the chromium utilization ratio in the chromium salt production process, effectively saves the chrome ore resources, and has obvious advantages of resource saving and environmental protection by using the microwaves as the heat source instead of the traditional coal and natural gas heating.

The invention discloses a resource utilization method for catalytic oxidation leaching of molybdenum and nickel from molybdenum-nickel ore. By the method, the production efficiency is improved and the production cost is reduced. The resource utilization method comprises the following steps: A) crushing and grinding the molybdenum-nickel ore to obtain molybdenum-nickel ore powder with the granularity of 100-300 meshes; B) preparing a leaching solution by using nitrate, acid and water in a ratio; C) adding the molybdenum-nickel ore powder obtained in the step A), a catalyst and the leaching solution obtained in the step B) into a reaction kettle, and performing leaching reaction to obtain leachate; and D) filtering the leachate, separating acid and salt from the filtrate by using a membraneseparation method or an ion exchange method, recycling an acid solution, adjusting the pH value of a salt-containing separated solution, and precipitating to obtain a molybdenum compound and a nickelcompound.

The invention relates to a method for recycling ferric sulphide-containing tailings. According to the method, oxidizing half-reaction FeS2+8H2O -> Fe<3+>+16H<+>+2SO4<2->+15e<-> and reducing half-reaction 3.75O2+15H<+>+15e<-> -> 7.5H2O (3) are respectively put into an anode chamber and a cathode chamber of a microbial fuel cell (MFC) for microbial leaching, so as to obtain ferric sulphide-containing tailings; and when metal is recovered, electrons released by oxidizing half-reaction can also be recovered by an outer circuit of the MFC in a form of electric energy, so that the operation cost is reduced. In addition, protons generated by oxidizing half-reaction are transmitted to a cathode to participate into reduction reaction to generate water, and are continuously consumed, so that the leaching rate can be significantly improved to improve the metal recovery rate; meanwhile, the generated water is environment-friendly and free of secondary pollution; and corrosion to equipment caused by acid production can also be retarded.

The invention provides a clean gold extraction device and method. The clean gold extraction device comprises a chemical adding system, a reaction tank, a solid-liquid separation system, a micro nanobubble generation device and a gold adsorption system. According to the device and method, gold extraction is carried out by using micro nanobubbles as an oxidizing agent source, and a large number of hydroxyl radicals can be generated through excitation. The hydroxyl radicals have the strong oxidizing property, so that the leaching rate of mineral powder is greatly increased. Moreover, the mass transfer efficiency of reactions is greatly improved because of particularly small bubbles. An amino acid gold extraction agent which is non-toxic to the environment is also adopted. The amino acid gold extraction agent is environmentally friendly and non-toxic. Waste water can be discharged through simple treatment. Leaching and adsorption can be conducted simultaneously. The production efficiency is improved. By adopting the clean gold extraction device and the gold extraction method adopting the cyanide-free amino acid gold extraction agent and modified PAN adsorption films, the leaching rate of gold ores easy to leach can be made greater than 90%, and the leaching rate of non-pretreated gold ores hard to leach is made to greater than 85%.

The invention relates to a method for leaching metallic copper in copper pyrites by using amino acid reinforced microorganisms. The method for leaching metallic copper in copper pyrites by using microorganisms is implemented as follows: microorganisms are adsorbed on the surface of copper pyrites to act with the copper pyrites, so that metallic copper ions in crystal lattices of the copper pyrites enter a solution; meanwhile, metabolites produced by the microorganisms have a chemical reaction with the copper pyrites, so that metallic copper in the copper pyrites is dissolved out; aminothiopropionic acid with concentration of 5*10<-3>-5*10<-4> mol/L is added in the process of leaching metallic copper in the copper pyrites by using the microorganisms. Compared with the prior art, in the process of leaching metallic copper in copper pyrites by using microorganisms, aminothiopropionic acid with certain concentration is added so as to improve the biological leaching efficiency of the copper pyrites; the method disclosed by the invention is simple in operation, and added aminothiopropionic acid is easily obtained and is non-toxic and harmless, therefore, the method for improving the microorganism leaching speed of the copper pyrites by using aminothiopropionic acid is simple and easy, and is applicable to the microorganism leaching processes of various copper pyrites.

The invention provides a cyanide-free extractant and a gold extracting method. The cyanide-free extractant comprises, by mass percentage, 0.5-2% of amino acid and 0.2-2% of alkali, wherein water serves as a solvent. According to the gold extracting method, the amino acid gold extracting agent free of toxicity to the environment is adopted for leaching of gold, the method is environmentally-friendly, free of toxin, short in leaching time and high in leaching rate, and waste water can be drained after being simply treated. According to the cyanide-free extractant and the gold extracting method, the leaching rate of gold ore easy to leach is high, is larger than 90% and can reach 95%; for traditional gold ore difficult to leach, such as ore which is not pretreated and contains pyrite cyanide arsenopyrite, the leaching rate is high as well and is larger than 85%, and the leaching rate is less than 30% compared with the leaching rate of a traditional cyaniding process of the same type of ore which is not pretreated, so that by the adoption of the cyanide-free extractant and the gold extracting method, the leaching rate of the gold ore difficult to leach can be increased greatly.

The invention discloses a method for recycling zinc from smelting waste residues. The method comprises the following steps: uniformly mixing the smelting waste residues with calcium hypochlorite, androasting at a high temperature to obtain a roasted product; uniformly mixing one coordination agent in citric acid or citrate with one coordination agent in tartaric acid or tartrate to obtain a coordination mixture, adding water, adding an ammonia water solution and ammonium sulfate after uniformly adding, uniformly mixing to form a coordination leaching agent; putting the obtained roasted product in the coordination leaching agent to subject to ultrasonic reaction to obtain a zinc leaching solution; adding zinc powder into the obtained leaching solution to react for certain time, then, filtering, and performing high-temperature roasting on the obtained filtrate to obtain zinc oxide. While a leaching rate of zinc in the smelting waste residues is guaranteed, impurity irons therein are prevented from leaching out; and the obtained zinc leaching solution can be roasted at a high temperature to directly obtain a high-purity zinc oxide product, so that zinc in the smelting waste residuesis conveniently recycled to apply in the industry.

The invention relates to the technical field of rose corolla processing, in particular to rose corolla drying and cell sap extraction equipment. The rose corolla drying and cell sap extraction equipment is used for improving the drying quality and drying efficiency of rose corolla. The rose corolla drying and cell sap extraction equipment is characterized by comprising a front vertical plate, an air deflector and a rear vertical plate. The crossing curve of the left side face of the air deflector in any horizontal section is an arch. The front vertical plate, the air deflector and the rear vertical plate are sequentially and fixedly connected. The portion, on the left side of the air deflector, of the area between the left vertical plate and the right vertical plate is in a U shape in any horizontal section. The rose corolla drying and cell sap extraction equipment has the beneficial effects that the drying efficiency can be improved, and the good quality of the rose corolla is ensured.

The invention discloses a method for extracting soybean oil by twice vacuum flash treatment and enzymolysis. First vacuum flash treatment is carried out on a soybean material after course crushing; the purpose of bursting cell walls is achieved under transient vacuum action and through the aid of the flash steam pressure generated by water in soybean embryonic cells, and fat is accumulated on thesurface layer after the wall bursting treatment. The porosity of the surface layer cells is increased, the leaching rate of grease and protein is improved, and the drying effect is achieved. Then soybean protein and soybean oil are effectively obtained by separation after the enzymolysis treatment, and the protein utilization rate of oil crops is improved. Secondary vacuum flash treatment is carried out on the obtained soybean oil; aldehyde and ketone substances, and free fatty acid generating peculiar smell in the soybean oil are rapidly removed; and meanwhile, the residual water is removed instantaneously. The obtained soybean oil has excellent quality, the loss of natural nutrient components in the soybean is low, the nutritional value is high, and the color reversion does not occur easily.

The invention relates to novel rhizoma polygonati wine and a production process thereof. The production process comprises the following steps: performing enzymolysis on traditional Chinese medicinal materials, performing diastatic fermentation, performing base liquor fermentation, adding edible alcohol for soaking, filtering, separating and the like. The wine provided by the invention takes the pure traditional Chinese medicinal materials with homology of medicine and food as raw materials and is safe and harmless to the human body; the wine meets the compatibility of the traditional Chinese medicinal materials, and has the effects of strengthening the spleen and stomach, reinforcing liver and kidney, nourishing yin and blood, regulating deficiency, calming the heart and tranquilizing themind and the like; by virtue of steps of filtration, beta-cyclodextrin debitterization and the like, bitterness is removed, and the taste is optimized. The innovation point is that by utilizing a manner of directly fermenting after performing enzymolysis on the traditional Chinese medicinal materials, the active ingredients in the medicinal materials are efficiently and fully released. Compared with the traditional health medicinal liquor, the novel rhizoma polygonati wine disclosed by the invention has the advantages that the production cycle is greatly shortened, the ingredients of the traditional Chinese medicinal materials are fully utilized, and the losses of nutritional ingredients are greatly reduced.

The invention relates to novel polygonatum sibiricum health-care wine and a brewing method thereof. The brewing method comprises the following preparation methods and steps of fermenting traditional Chinese medicine raw materials, adding edible alcohol for soaking, performing filtering separation and the like. According to the health-care wine, pure traditional Chinese medicines being medicinal and edible are used as the raw materials, and are safe and harmless. The novel polygonatum sibiricum health-care wine conforms to efficacy of traditional Chinese medicine and pharmacy materials, and hasthe efficacy of invigorating the spleen and the stomach, tonifying the liver and kidney, nourishing yin and blood, regulating consumptive disease, quieting the heart, soothing the nerves and the like. Through repeated experiments, the content is optimized and adjusted to be reasonable, and the novel polygonatum sibiricum health-care wine is appropriate in taste. Creatively, medicinal materials are directly fermented, so that effective components are efficiently and sufficiently released. Compared with conventional health-care medicinal wine, the production cycle is greatly shortened. The traditional Chinese medicine components are sufficiently used, and the loss of nutrient components is greatly reduced.

The improved method for extracting melingmycin from Nanchang streptomycete fermented liquor is mainly formed from the following steps: pretreatment process of fermented liquor, liquid-solid separation process, extracting melingmycin from residual filtrate and recovering process, pretreatment process of filter cake (mycelium), further solvent leaching of mycelium and concentration process of leaching liquor and one-step extraction process of concentrated leaching liquor. The total recovery rate of melingmycin can be up to above 85%.