2088 results about "Filter cake" patented technology

The invention provides a method for synthesizing 1, 2-bis (4-vinyl phenyl) ethane, which comprises the following steps: adding a first solvent, methyl triphenyl phosphine halide and strong alkali into a reaction flask, and uniformly stirring to obtain a first mixed solution; heating the first mixed solution and carrying out reflux reaction for 1 hour; dropwise adding a 1, 2-bis (p-formaldehyde phenyl) ethane solution until the reflux reaction is finished to obtain a second mixed solution; reducing the temperature of the second mixed solution to room temperature, and adjusting the pH value of the second mixed solution to obtain a first solution; layering the first solution, and taking an organic layer; adding a polymerization inhibitor into the organic layer to obtain a second solution; concentrating the second solution to obtain a 1, 2-bis (4-vinyl phenyl) ethane crude product; adding a poor solvent into the crude product, stirring and crystallizing; filtering the crystal to obtain a filter cake, adding a second solvent into the filter cake, and washing and drying the filter cake to obtain 1, 2-bis (4-vinyl phenyl) ethane; the method for synthesizing the BVPE is simple and low in raw material cost, and the synthesized BVPE is high in purity and free of product isomeride.

The invention belongs to the technical field of denitration catalyst preparation, and discloses a meerscham-TiO2 composite carrier loaded manganese cerium medium and low temperature denitration catalyst and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing meerschaum and nitric acid, then heating and stirring for reaction, then carrying out suction filtration and washing, and drying to obtain a meerschaum-TiO2 composite carrier loaded manganese cerium medium and low temperature denitration catalyst; after the treated sepiolite is drained, drying and screening are conducted, and nitric acid acidified sepiolite is obtained; and (2) mixing the meerschaum acidified by nitric acid and TiO2, then adding the manganese source precursor solution into the acidified meerscham-TiO2, then dipping and stirring, dropwise adding a potassium permanganate solution into the solution, then adding a cerium nitrate solution, stirring and then carrying out suction filtration, drying, grinding and screening the obtained filter cake, and then calcining to obtain the catalyst. According to the invention, the acidified sepiolite and TiO2 are compounded, so that complementary advantages of the two carrier materials are realized, and the obtained catalyst not only has good denitration efficiency, but also can significantly reduce the production cost.

The preparation method comprises the following steps: S1, preparing a phosphoric acid solution, a hydrogen peroxide solution, a Ti salt, a phosphor salt solution and a ferrite solution; s2, Ti salt and the ferrite solution are mixed, and a titanium iron salt solution is obtained; mixing the phosphoric acid solution and the phosphorus salt solution to obtain a phosphorus source solution; s3, adding the titanium iron salt solution into a reaction kettle, and adding the hydrogen peroxide solution; s4, adding the phosphorus salt solution into the reaction kettle to obtain yellow slurry; s5, after the color of the slurry is heated to be white, white slurry is obtained; s6, carrying out solid-liquid separation on the white slurry to obtain an iron phosphate dihydrate filter cake; and S7, drying and calcining the iron phosphate dihydrate filter cake to obtain the Ti-doped battery-grade anhydrous iron phosphate. The titanium-doped iron phosphate is firstly prepared by a one-step method, the pH value of the reaction system is controlled by controlling the molar ratio of the iron element to all phosphorus elements in total phosphorus, ammonium phosphate and phosphoric acid in the reaction system, and the retention of the Ti element in the finished product and the regulation and control of the iron-phosphorus ratio in a specified range are ensured.

The invention discloses a novel electrolytic tank pipeline filter and a self-cleaning system. The novel electrolytic tank pipeline filter comprises a multi-stage filtering part, the self-cleaning system and an intelligent control system, the multi-stage filtering part comprises multi-stage filter elements arranged in the material pipeline, and the multi-stage filter elements are arranged from large to small according to the filtering particle size to form a filtering gradient; the self-cleaning system acts on the multi-stage filter element part at the same time or in a time-sharing manner on the basis of a fluid reverse recoil principle; the self-cleaning system is combined with pulsating flushing control, so that the filter element is separated from a filter cake at low loss; the multi-stage gradient filtration is adopted, impurities are efficiently and accurately intercepted, the filter elements with the particle sizes from large to small are arranged in a gradient mode, the first-stage titanium alloy filter element intercepts large particles, the second-stage polytetrafluoroethylene membrane filters tiny impurities, the efficiency is improved through graded interception, the loss of the filter elements is reduced, and the material purity and the hydrogen production quality are guaranteed. The multi-element self-cleaning technology is adopted, low-loss deep cleaning is achieved, and the self-cleaning system integrates multiple technologies such as fluid reverse backflushing, pulsating flushing, ultrasonic vibration and a pulsed electric field.

The invention discloses a method for reducing the content of aged starch and soluble miscellaneous sugar in alpha-cyclodextrin, and belongs to the technical field of alpha-cyclodextrin synthesis, the method comprises the following steps: liquefaction, conversion, primary filtration, inclusion, secondary filtration, complexing agent removal and post-treatment; the conversion comprises the following steps: adding alpha-CGTase and isoamylase into the starch liquefied liquid at 38-42 DEG C, adjusting the pH value to 5.30-5.70, and carrying out conversion to obtain a conversion liquid; the primary filtration comprises the following steps: carrying out enzyme deactivation treatment on the conversion liquid, filtering, washing a filter cake with water, and combining the washing liquid with the filtrate to obtain primary filtrate; and the secondary filtration comprises the following steps: filtering the material liquid containing the complex, taking a filter cake, and washing the filter cake with water to obtain the inclusion compound. The preparation method of the alpha-cyclodextrin is improved, so that the alpha-cyclodextrin with high yield and high stability is obtained, and the industrial controllability is realized.

The invention discloses a method for preparing MHP by cyclic utilization of manganese precipitation post-solution, which comprises the following steps: mixing sodium hydroxide, magnesium oxide and manganese precipitation post-solution to obtain compound alkali slurry; mixing the laterite-nickel ore liquid subjected to iron and aluminum removal with the compound alkali slurry, and carrying out precipitation reaction to obtain MHP slurry; carrying out thickening treatment on the MHP slurry to obtain a dense underflow; filtering the dense underflow to obtain an MHP filter cake and filtrate; directly carrying out manganese precipitation treatment on the filtrate to obtain manganese slag and manganese-precipitated liquid; and reusing the manganese-deposited liquid in the preparation of the compound alkali slurry. According to the invention, a sodium hydroxide and magnesium oxide compounded system is utilized, so that the MHP precipitation process can be simplified to one step. And meanwhile, part of the manganese-deposited liquid is recycled to the alkali preparation process, so that the wastewater treatment cost is reduced, and the magnesium content in the MHP can be reduced by controlling the circulation amount of the manganese-deposited liquid, and the cost of preparing crystals through subsequent fine extraction of the MHP is reduced.

The invention relates to the technical field of swimming pool filtration, in particular to a composite treatment method of a filter aid for swimming pool filtration, which comprises the following steps: S1, adding the filter aid: adding a powdered activated carbon filter aid into a filter through a feeding pump, and forming an activated carbon filter aid filter cake in the filter; s2, filtering: intercepting or adsorbing impurities when the water in the to-be-treated pond is filtered through an activated carbon filter aid filter cake and a filter, and continuously or intermittently supplementing a powdered activated carbon filter aid in order to maintain the filtering efficiency; s3, backwashing: when the pressure difference of the filter reaches a set value, backwashing is started, and intercepted and adsorbed pollutants and the activated carbon filter aid filter cake slurry are discharged into a drainage system together. The device has the effects of efficiently removing chloramine and other disinfection by-products, peculiar smell, pigment and other pollutants, guaranteeing the water quality safety of the swimming pool and maintaining normal operation of the swimming pool.

The invention relates to a method for treating a waste iron phosphate positive electrode material by a phosphoric acid-hydrogen peroxide method matched with a specific complexing agent. The method comprises the following steps: crushing the positive electrode material of the waste lithium iron phosphate battery, adding the crushed positive electrode material into deionized water, and stirring to prepare slurry; heating the slurry, dropwise adding a phosphoric acid-hydrogen peroxide mixed solution and a complexing agent, adding a NaOH solution to adjust the pH value to 3.5, and filtering to obtain a filtrate and a filter cake; adding a NaOH solution into the filtrate, and adjusting the pH value to 10 to obtain lithium phosphate; performing evaporative crystallization on the filter cake to obtain trisodium phosphate; the complexing agent is prepared by adding pentasodium salt of amino trimethylene phosphonic acid, triallyl citrate, epoxysuccinic acid and DMF (Dimethyl Formamide) into a reaction kettle, mixing, adding ammonia water to adjust the pH value to be 10, and distilling to remove the DMF after the reaction is finished. The precipitation rate of Fe reaches up to 99.99%, the leaching rate of Li reaches up to 99.91%, and efficient separation and recycling of lithium and iron are achieved.

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using titanium gypsum and a waste hydrogenation catalyst, which comprises the following steps: crushing and pickling the waste hydrogenation catalyst, washing with clear water until the waste hydrogenation catalyst is neutral, and drying to obtain pretreated waste catalytic powder; uniformly mixing and stirring titanium gypsum and the pretreated waste catalytic powder to obtain gypsum doped pretreated waste catalytic powder; mixing a plant extract, crop powder and gypsum, doping the pretreated waste catalytic powder, uniformly stirring, feeding into mixed bacteria consisting of bacillus and aspergillus, and fermenting under a stirring condition to obtain a biological activated mixture; adding water into the biological activation mixture for hydrothermal reaction, filtering, separating and washing the material after the hydrothermal reaction is finished, roasting the washed filter cake, naturally cooling the roasted material, and crushing to obtain the carbon monoxide oxidation catalyst. According to the invention, the titanium gypsum and the waste hydrogenation catalyst are combined, and the biomass material is used for activating treatment, so that the use of chemical precursors is reduced, and the oxidation catalyst with excellent catalytic performance is obtained.

Belonging to the field of petrochemical engineering, the invention discloses a catalytic slurry oil purification device, which comprises a tank body, and a feed end and a discharge end respectively arranged at two ends of the tank body. An upper partition plate and a lower partition plate are fixedly connected to the inner wall of the tank body, a discharging opening is formed in the upper partition plate, and a feeding opening is formed in the lower partition plate; the interior of the tank body is divided into three independent cavities by the upper partition plate and the lower partition plate; according to the scheme, the filter element is sleeved with the hollow cylinder, and the rotatable first spiral flow deflector is further arranged between the inner wall of the hollow cylinder and the outer wall of the filter element; a rotatable first spiral flow deflector is further arranged between the inner wall of the hollow cylinder and the outer wall of the filter element; a shear force generated by rotation of the first spiral flow deflector can prevent a filter cake on the surface of the filter element from forming a compact thick layer; a filter cake layer can be controlled within a relatively thin thickness range, and the rising speed of the pressure difference is delayed, so that the operation duration of a single filtering period is prolonged; and the single-time continuous treatment capacity of the device is greatly improved.

The present application relates to the technical field of battery materials, and provides iron phosphate having low sulfur content and a high iron-phosphorus ratio, a preparation method therefor, and a use thereof. The preparation method for the iron phosphate having low sulfur content and a high iron-phosphorus ratio comprises: providing amorphous iron phosphate; adding water and phosphoric acid into the amorphous iron phosphate for slurrying treatment, and then heating and aging to obtain an aged slurry; carrying out slurry washing and filter pressing on the aged slurry to obtain a first filter cake; adding water and a first pH regulator into the first filter cake for slurry washing to obtain a first slurry having a pH value range of 3.0-5.0, and carrying out filter pressing on the first slurry to obtain a second filter cake; and rinsing, drying and calcining the second filter cake to obtain iron phosphate having low sulfur content and a high iron-phosphorus ratio. The present application facilitates preparation of iron phosphate having low sulfur content, a high iron-phosphorus ratio, and a large specific surface area. The iron phosphate can be used for preparing lithium iron phosphate having good electrochemical performance, and the lithium iron phosphate can be further used for preparing a positive electrode sheet and a secondary battery having good electrochemical performance.

The invention provides a method and system for separating and washing red mud in aluminum oxide production, and the method comprises the following steps: pretreating red mud slurry to improve the filtering performance of the red mud slurry; filtering the pretreated red mud slurry under set filtering conditions to form a red mud filter cake; in the filtering process, when the thickness of the dehydrated red mud filter cake reaches a set thickness, dehydrating the red mud filter cake so as to reduce the moisture content of the dehydrated red mud filter cake; performing multi-stage countercurrent washing on the dehydrated red mud filter cake to obtain a countercurrent washing solution; and carrying out purification treatment and concentration treatment on the countercurrent washing liquid, and returning the countercurrent washing liquid subjected to purification treatment and concentration treatment to the multi-stage countercurrent washing step as a washing liquid for cyclic utilization. The problem that the resource recycling rate is low in the red mud separating and washing process in aluminum oxide production is effectively solved.

The application provides a reverse water gas shift catalyst, a preparation method and application thereof, and the reverse water gas shift catalyst prepared by the preparation method has excellent catalytic activity and high CO selectivity in a reverse water gas shift reaction. The preparation method comprises the following steps: contacting a precipitating salt solution with a precipitant aqueous solution and performing co-precipitation, and simultaneously controlling the reaction temperature to be 40-80 DEG C and the pH to be 6-8; optionally performing aging after the co-precipitation is completed; filtering the obtained precipitate to obtain a filter cake, washing the filter cake, then drying the filter cake, and calcining the filter cake at 300-500 DEG C to obtain the reverse water gas shift catalyst; wherein the precipitating salt solution is a mixed aqueous solution of a soluble salt of divalent metal ions and a soluble salt of trivalent metal ions, the divalent metal ions are selected from divalent ions of Mg and / or Zn, and the trivalent metal ions are selected from trivalent ions of Al, In and / or Ga.

The invention provides a rapid preparation method of tungsten trioxide, which specifically comprises the following steps: step 1, weighing crude tungstic acid, dissolving in ammonia water, heating and stirring to obtain an ammonium tungstate solution; step 2, slowly dropwise adding the ammonium tungstate solution in the step 1 into a poor solvent to obtain an ammonium paratungstate suspension, and step 3, filtering the ammonium paratungstate suspension in the step 2 to obtain an ammonium paratungstate filter cake, and leaching the ammonium paratungstate filter cake with the poor solvent; 4, the ammonium paratungstate filter cake in the step 3 is placed in a drying oven to be dried; and (5) roasting the ammonium paratungstate filter cake in the step (4) at high temperature to obtain a faint yellow irregular flaky tungsten trioxide product. According to the preparation method, a mixed solvent crystallization and high-temperature roasting two-step process is adopted, the solubility of ammonium tungstate in water is reduced by adding a poor solvent, so that an ammonium tungstate solution rapidly reaches a saturated state and is separated out, the crystallization process of ammonium paratungstate is accelerated, and the preparation speed and the crystallization rate of a tungsten trioxide product are high.

The invention belongs to the technical field of wastewater treatment and recycling, and relates to a low-pressure ultrafiltration sewage treatment method and device based on bioelectrochemical enhancement and application. The treatment device consists of a water inlet tank, a constant water level water tank, a cathode, a resistor, a membrane assembly, a biological filter cake layer, a pre-filtering layer-anode, an ultrafiltration membrane, a water collecting device, a data acquisition module and a computer. The treatment device is used for treating effluent of a secondary sedimentation tank of a sewage plant and tail water of livestock and poultry breeding wastewater; on the basis of retaining nitrogen and phosphorus resources, deep removal of heavy metals and antibiotics is realized, propagation of resistance genes is inhibited, and safe reuse of nitrogen and phosphorus resources in effluent of sewage plants and tail water of livestock and poultry breeding wastewater can be realized. In the invention, low-pressure ultrafiltration adopts transmembrane pressure difference generated by gravitational potential energy to realize continuous flow filtration, coupled bioelectrochemistry utilizes electric energy generated by biodegradation of organic matters to realize reduction of heavy metals and deep removal of reinforced antibiotics, and the method has the advantages of greenness, low carbon and sustainability.

A filter and method for removing solids from FCC oil slurries and concentrates thereof is provided. The filter comprises a main tank (4), a first filter cylinder, a second filter cylinder and a third filter cylinder, each of which is composed of a main conduit and a number of secondary conduits with porous outer walls surrounding the main conduit, each of which is fitted with a single turn of first filter membrane around its outer periphery, a filter cake scraper (7) installed inside the main tank above the third filter cylinder, and a deslagging bin (8) installed at the bottom of the main tank. The present invention can achieve complete solid-liquid separation of FCC oil slurry and its concentrate, and fully automatic, intelligent operation.

The invention discloses a control method based on coal dressing intelligent filter pressing, and belongs to the technical field of coal dressing, and the control method specifically comprises the following steps: pre-grading original coal slime through an intelligent multi-stage cyclone, collecting coal slime property data of each section in real time by using online detection equipment, and transmitting the coal slime property data to an intelligent control system; through a dual optimization mechanism, coal slime properties and filter pressing grades are matched, and optimal filter pressing parameters are generated; a multi-machine cooperative control strategy is adopted to drive a three-stage filter press to operate step by step, a virtual model of the filter press is constructed through real-time working state parameters of a sensor, and an abnormal state is dynamically corrected in combination with the real-time working state parameters and a fuzzy PID algorithm; carrying out resource processing on a filter cake generated by filter pressing, and meanwhile, carrying out grading treatment on filtrate; intelligent control over the whole process of coal slime grading filter pressing is achieved, and the coal slime treatment efficiency and the resource utilization rate are improved.

The invention discloses a preparation method of high-strength nanofibers for a lithium battery cellulose-based diaphragm, and belongs to the technical field of lithium battery diaphragms.The preparation method comprises the following steps that amino-terminated silane and an ethanol solution are mixed and stirred to be uniform, and hydrolysate is obtained; adding magnetic cellulose nanofibrils into the hydrolysate, carrying out stirring reaction at 60-80 DEG C for 8-10 hours, carrying out magnetic separation, and drying a separated product at 100 DEG C for 2 hours to obtain aminated magnetic cellulose nanofibrils; the preparation method comprises the following steps: adding aminated magnetic cellulose nanofibrils, an MOFs material containing amino functional groups and multi-aldehyde boric acid ester into dimethylformamide, stirring for 15-30 minutes, heating to 80 DEG C, stirring and reacting for 12 hours, carrying out suction filtration, washing a filter cake, and drying to obtain the high-strength nanofiber for the cellulose-based diaphragm of the lithium battery, and using the high-strength nanofiber for preparing the lithium battery diaphragm. And the obtained diaphragm has the advantages of high liquid absorption rate, good mechanical property and the like.

The invention relates to the technical field of filtering, and particularly discloses a negative pressure impurity filtering device for removing solid particles in scrap removing liquid, which comprises a rotary drum frame, an empty groove formed in the annular side of the rotary drum frame, a box body arranged outside the rotary drum frame, and a driving assembly arranged outside the box body and used for driving the rotary drum frame to rotate, an empty groove is formed in the rotating drum frame, the rotating drum frame is provided with filter cloth for filtering in the empty groove, an adsorption pipe fitting for generating negative pressure is arranged in the rotating drum frame, the size of the filter cloth is larger than that of the interior of the empty groove, and the pushing assembly is used for pushing the filter cloth from the interior to enable the filter cloth to deform so as to enable a filter cake to fall off. Through the matching of the structure, the T-shaped frame can extrude the filter cloth to deform the filter cloth, the influence of excessive accumulation of filter cakes on the subsequent filtering effect is avoided, meanwhile, the filter cakes are removed without adopting an external scraping mode, the condition that the filter cloth is scratched by metal chips when the filter cakes are scraped is reduced, and thus the service life of the filter cloth is prolonged.

The invention provides a method for determining the washing stage number of a dedusting ash washing desalination system and electronic equipment, and the method comprises the steps: firstly determining the first alkali metal salt content of a filter cake generated by a first-stage washing desalination system, judging whether the first alkali metal salt content is smaller than or equal to the alkali metal salt content in a sintering ingredient, and if yes, determining the first-stage washing desalination system; determining the washing stage number of the dedusting ash multi-stage washing desalination system to be 1, if not, starting the ith-stage washing desalination system to enter a working state, determining the current alkali metal salt content of a filter cake generated by the ith-stage washing desalination system, and judging whether the current alkali metal salt content is smaller than or equal to the alkali metal salt content in the sintering ingredients or not; if yes, i corresponding to the ith-stage washing desalination system serves as the washing stage number of the dedusting multi-stage washing desalination system; and if not, assigning i + 1 to i. According to the method, the source of the fly ash does not need to be determined, the washing stage number of the fly ash washing desalination system can be accurately determined under the condition that the components of the fly ash are not determined, and favorable guidance is provided for production.

The present application discloses a feed additive and preparation method for promoting intestinal health of livestock and poultry, which comprises the following steps: S1, adding water to montmorillonite and sodium chloride, stirring evenly to form a suspension slurry with a concentration of 10% to 20%, sodiumizing at room temperature, and re-forming the slurry with water to a concentration of 15% to 40%; S2, slowly adding cetylpyridinium chloride to the slurry of step S1 under stirring, and continuously stirring at room temperature for a certain time; S3, slowly adding carvacrol to the slurry of step S2 under stirring, and continuously stirring at room temperature for a certain time; S4, dehydrating the reaction solution of step S3, and drying the obtained filter cake; the dried filter cake needs to be inspected to see if it is completely dried; S5, crushing to obtain a feed additive for promoting intestinal health of livestock and poultry. Adding 0.1% of the feed additive for promoting intestinal health of livestock and poultry to the diet of laying hens can increase the egg production rate of laying hens by 1.5 percentage points, effectively control spotted eggs, and increase the qualified egg rate by 2 percentage points.

The invention provides a sintering dedusting ash washing desalination treatment method, system and equipment and a storage medium, the ith-stage washing desalination system is started to enter a working state, the alkali metal salt content of a filter cake generated by the ith-stage washing desalination system is determined, and whether the alkali metal salt content is smaller than or equal to the preset alkali metal salt content or not is judged; if yes, a filter cake generated by the ith-stage washing desalination system is sent to a sintering burdening procedure, and if not, whether the ith-stage washing desalination system is the last-stage washing desalination system or not is judged; if yes, a filter cake generated by the ith-stage washing desalination system is sent to the slurry tank of the first-stage washing desalination system to participate in washing again, and if not, i + 1 is assigned to i, and a filter cake generated by the (i-1) th-stage washing desalination system is sent to the ith-stage washing desalination system. The alkali metal salt content of the dedusting ash is judged, the washing stage number is reduced as much as possible while it is guaranteed that alkali metal enrichment cannot be caused when the filter cake enters sintering, and therefore the equipment loss is reduced, and the production cost is reduced.

The invention relates to the technical field of environmental protection, in particular to a resourceful treatment method for washing fly ash and application. The method provided by the invention overcomes the defects of low resource recovery rate and residual pollutants in the existing resourceful treatment of the washing fly ash. The method comprises the following steps: firstly mixing the fly ash with a chelating agent, then mixing with an acid washing solution, and carrying out primary washing to obtain a primary filter cake and a primary filtrate; performing second-stage washing on the first-stage filter cake by using deacidified wastewater to obtain a second-stage filter cake and second-stage filtrate; performing third-stage washing on the second-stage filter cake by using condensed water to obtain a third-stage filter cake and third-stage filtrate; the method comprises the following steps: firstly, carrying out pH regulation and flocculation treatment to generate a precipitate and a purified filtrate, and carrying out filtration, electrodialysis and evaporative crystallization on the purified filtrate to obtain sodium chloride and sodium sulfate; and mixing the third-stage filter cake with the precipitate, carrying out melting treatment, and cooling a vitrification product. The resourceful treatment method for the washing fly ash is high in resourceful efficiency and low in pollutant residue.

The invention discloses a centrifugal machine for sludge dewatering, belongs to the technical field of sludge dewatering, and aims to solve the problems that when the centrifugal machine for sludge dewatering is used, sludge on the inner wall of a rotary drum can be gradually compacted to form a filter cake layer, particles in the filter cake layer easily form a bridging structure at an inlet of a through hole, and the sludge dewatering efficiency is affected. A controller is arranged on the outer wall of the supporting frame, a cylinder is arranged in the supporting frame, one side of the cylinder communicates with a drainage pipe, a first driving assembly is arranged in the cylinder, a dewatering assembly is arranged on one side of the first driving assembly, a second driving assembly is arranged in the cylinder and rotationally connected with the cylinder, and a sewage pumping assembly is arranged at the top of the supporting frame. According to the invention, dual blockage clearing of crushing blockages by the conical rod and purging by high-pressure gas is conveniently realized, shutdown disassembly is not needed, continuous smoothness of the water outlet hole is guaranteed, stable efficiency of centrifugal dewatering is maintained, and the dewatering effect is enhanced.

According to the harmless filling method and system for the cyanide-containing tailings, cyanide-containing tailing slurry is directly subjected to filter pressing and dehydration, and rapid and efficient solid-liquid separation is achieved under the vacuum effect by adopting a ceramic filter press and utilizing a special microporous ceramic filter plate of the ceramic filter press. Furthermore, cyanide-containing wastewater is recycled and treated, and recycled water is used for washing and / or slurry preparation, so that the cyclic utilization of water resources is realized, the consumption of fresh water is reduced, and the production cost is reduced. By utilizing the belt conveyor with an accurate metering function, accurate control of the adding amount of the tailing filter cake is realized, and the consistency of the raw material proportion and the target value during subsequent stirring is ensured. Moreover, through automatic adjustment of online concentration monitoring and a central control system, real-time water supplementing adjustment can be achieved, it is ensured that the slurry concentration is always close to a set value, and therefore the uniformity and quality of filling materials are improved. In the filling process, the accuracy and the high efficiency of filling operation are ensured through the application of real-time monitoring and automatic control technologies.

The invention relates to a method for recovering phosphorus and vanadium from a vanadium-containing salt-removed filter cake, and belongs to the technical field of aluminum oxide preparation. The method comprises the following steps: firstly, preparing vanadium-containing salt elimination filter cake slurry, then adding a dephosphorizing agent into the vanadium-containing salt elimination filter cake slurry, and promoting the dephosphorizing agent to generate precipitation reaction with phosphorus in the slurry to form a precipitate containing phosphorus element, so as to obtain a mixed solution containing the precipitate; next, solid-liquid separation is carried out on the mixed solution, precipitates containing phosphorus elements are filtered out, and the remaining vanadium-containing filtrate is further subjected to impurity removal treatment, so that residual carbonate radicals after the dephosphorization reaction and impurity elements such as arsenic and fluorine in the solution are removed, and adverse effects on the subsequent vanadium precipitation reaction are avoided. And after impurity removal is completed, vanadium precipitation reaction is carried out, and a pure vanadium-containing product is obtained. According to the method, by using the specific dephosphorizing agent, phosphorus in the vanadium-containing salt elimination filter cake is effectively recovered, and the tailing discharge amount is reduced. Meanwhile, the method also improves the concentration of vanadium, is beneficial to the recovery of vanadium, and realizes the simultaneous recovery of phosphorus and vanadium in the vanadium-containing salt elimination filter cake.

The invention provides a polysilicate aluminum zirconium coagulant as well as a preparation method and application thereof, and relates to the technical field of solid waste recycling. The preparation method of the polysilicate aluminum zirconium coagulant comprises the following steps: S1, activation preparation of a polysilicate solution; S2, introduction and pre-complexation of a metal salt solution; and S3, alkalization induced polymerization and curing. According to the invention, the efficient charge neutralization capability of zirconium and aluminum metal ions and the long-chain network structure characteristic of polysilicic acid are organically combined through a copolymerization reaction by molecular design, the developed polysilicate aluminum zirconium coagulant can maintain a good coagulation effect in a wide pH range, is suitable for treating residual sludge with different sources and properties, and has a good coagulation effect under the dosage of 7.5%. The CST value is reduced to 35.4 s from 190.7 s, the water content of a filter cake is reduced to 77.4%, and the Zeta potential is-8.2 mV, so that the polysilicate aluminum ferric coagulant is obviously superior to a traditional polysilicate aluminum ferric coagulant, and has the advantages of high operation flexibility, good process stability and good application prospect.

The invention belongs to the technical field of water treatment, and particularly relates to a preparation method and application of a PDA / CS composite adsorbent loaded with a bimetallic system, and the preparation method comprises the following steps: 1) dissolving dopamine in a Tris buffer solution to prepare a dopamine prepolymer solution; then adding FeCl3, and carrying out constant-temperature water bath; centrifuging the obtained black suspension, performing suction filtration, washing, collecting a filter cake, and performing freeze drying to obtain PDA microspheres; 2) dispersing PDA microspheres in deionized water, and carrying out ultrasonic treatment until the PDA microspheres are uniformly dispersed; 3) dissolving chitosan in an acetic acid solution, and adding CuCl2 to prepare a mixed solution; the suspension obtained in the step 2 is dropwise added into a mixed solution for constant-temperature water bath, the pH of the mixed solution is adjusted through a NaOH solution, glutaraldehyde is added for constant-temperature water bath after constant-temperature water bath, and 4, the obtained suspension is subjected to centrifugation, suction filtration, washing, filter cake collection and freeze drying.

The invention discloses a method for extracting copper fine powder by flotation of copper-containing ore, which belongs to the technical field of mineral processing, and comprises the following steps: after copper-containing raw ore is crushed, ground and classified by a cyclone, overflow enters flotation, and settled sand is returned for regrinding; sodium carbonate is added into graded overflow to adjust the pH, a sodium hexametaphosphate-polyacrylamide composite dispersant is added, and copper sulfate is added and stirred after low-temperature microwave heating; gradient flotation is conducted, specifically, copper sulfide is roughly selected, the pH is adjusted, an amino-sulfonic acid group synergistic modified layered double metal hydroxide / cobalt ferrite composite collecting agent is added, and rough concentrate 1 is obtained through high-frequency pulse air inflation flotation; copper oxide roughing is conducted, clear water is supplemented to adjust the pH, and a collecting agent is supplemented to obtain rough concentrate 2; scavenging is performed for three times, a collecting agent is added for flotation, and concentrate returns to the previous stage; the rough concentrates are combined, and magnetic impurities are removed through high-gradient magnetic separation to obtain magnetic concentrates; and carrying out microbiological leaching on tailings to recover copper. The composite collecting agent is prepared through layered double hydroxide carrier synthesis, amino modification, sulfonic acid group grafting and cobalt ferrite anchoring.

The invention discloses a preparation process of berberine hydrochloride, and belongs to the technical field of berberine production. The invention relates to a berberine hydrochloride preparation process, which comprises: S1, mixing a ferric sulfate-aluminum sulfate composite salt, sodium chloride, zinc chloride and anhydrous formic acid, pre-activating, adding N-2, 3-dimethoxybenzyl homopiperony lamine hydrochloride, dropwise adding a glyoxal mixed solution, and carrying out a reflux reaction. And S2, cooling the reaction liquid until a solid is separated out, filtering, adding a filter cake and diatomite into purified water, stirring, adjusting alkali, heating, and continuously stirring for 0.5-1 hour. Cooling and filtering, and reserving filtrate; s3, adjusting the acidity of the filtrate, cooling and growing crystals; and filtering, rinsing a filter cake, and carrying out vacuum drying on the filter cake to obtain berberine hydrochloride. The berberine hydrochloride prepared by the method is high in yield and purity, and the preparation process is safe, short in flow and friendly to human bodies and environment.