108 results about "Potash" patented technology

The invention discloses a short-distance multi-ore-bed potassic salt ore large-section long-strip comprehensive mechanized mining method, and belongs to the technical field of potassic salt ore deposit mining. The method comprises the steps that a centralized transportation roadway is arranged on an upper head mining layer, an auxiliary transportation roadway is arranged in a stable salt rock interlayer between ore layers, and combined development is achieved; arranging large-section long strip chambers in the ore blocks along the inclination direction, and reserving permanent spacing strip pillars to maintain the stope to be stable; a chamber is cut and formed at a time by a double-arm large-mining-height mining machine, and efficient stoping is realized by matching with a continuous transportation system; multiple ore beds are mined in a coordinated mode from top to bottom in sequence, and the ore block air return way and the ore block air return way of the upper ore bed are staggered by 20 m or above so as to avoid stress superposition; a full-air-pressure ventilation system combining a press-in type and a draw-out type is constructed; natural supporting is achieved through permanent spacing strip pillars and natural top and bottom plates, safety is guaranteed through a micro-seismic and top plate monitoring system, and the goaf is backfilled with tail salt slurry to achieve green mining. According to the method, safe, efficient and high-recovery-rate mining of the short-distance multi-ore-bed sylvite ore is achieved.

The invention belongs to the technical field of chemical fertilizer production and livestock feed, and particularly relates to a combined preparation method of water-soluble potassium sulfate and feed-grade potash magnesium sulphate fertilizer. According to the method, the picromerite concentrate wet material is taken as an initial raw material, the picromerite concentrate wet material with relatively low potassium and magnesium content is purified into high-grade potassium sulfate and the potash magnesium sulphate fertilizer by utilizing hot melt mother liquor at different mother liquor points through multi-stage hot melt and multi-stage vacuum evaporative crystallization, so that efficient distribution and conversion of potassium and magnesium elements in the raw material are realized, resource waste is avoided, and the production cost is reduced. The comprehensive utilization rate of raw materials is greatly improved. Two high-added-value products, namely the water-soluble potassium sulfate and the feed-grade potassium-magnesium fertilizer, are prepared at the same time, and the blank of combined preparation of raw materials required by agriculture and animal husbandry is filled.

The invention provides a sylvite flotation reagent dosage dynamic control method. The sylvite flotation reagent dosage dynamic control method comprises the following steps that at least one ore pulp parameter and at least one foam image characteristic parameter of a sylvite flotation system are collected in real time; dynamically calculating a flotation reagent dynamic response coefficient required at the current moment based on the collected real-time parameters; according to the dynamic response coefficient of the flotation reagent, the adding amount of the flotation reagent is adjusted in real time; according to the method, the multi-dimensional key parameters are collected in real time, the dynamic response model integrating multi-parameter coupling, historical efficiency accumulation and process time delay correction is constructed, accurate and real-time adjustment of the drug dosage is achieved, meanwhile, the method has the model self-adaptive calibration capability, and the problems that in the prior art, control precision is low, and adaptability is poor are solved.

The invention relates to a hydraulic support base for potassic salt ore. The hydraulic support base comprises a first base body, a second base body, a gap bridge plate, a first connecting pin and a second connecting pin. Strip-shaped holes extending in the vertical direction are formed in the two ends of the gap bridge plate; a first lug plate is arranged on the inner side of the first base, and a second lug plate is correspondingly arranged on the inner side of the second base; the long-strip-shaped holes in the two ends of the gap bridge plate are hinged to the first lug plate and the second lug plate through a first connecting pin and a second connecting pin respectively. The axial directions of the first connecting pin and the second connecting pin are front and back directions; the first connecting pin and the second connecting pin can slide along the long-strip-shaped hole, dislocation of the first base and the second base is achieved, and therefore the support can cope with potassic salt ore bottom plates of different forms, and the support has the advantages that local suspension or stress concentration caused by unevenness of the potassic salt ore bottom plates can be effectively avoided, and the stability of the support under the potassic salt ore complex terrain is maintained. And the position of the base can be flexibly adjusted according to site ground conditions, installation is rapidly completed, and the installation time is greatly shortened.

The invention discloses a solid potassic salt mine underground screening and crushing integrated ore storage bin system, and belongs to the technical field of solid potassic salt mine mining. The system is composed of a roadway type raw ore bin, a feeding chamber and a vertically-arranged screening and crushing chamber. The raw ore bin is communicated with the main transportation roadway and is internally provided with a bulldozer; the feeding chamber is provided with a surge bin and a screw feeder; a linear vibrating screen and a double-geared-roller crusher are arranged in the screening and crushing chamber. The core of the method is that oversize coarse grain materials are returned to a surge bin through an oversize transfer belt conveyor to form closed-loop crushing circulation, and it is ensured that the ore removal granularity is smaller than or equal to 20 mm. The problem that sylvite ore is prone to deliquescence and hardening is fundamentally solved through the roadway type ore storage bin, underground storage, screening and crushing integrated operation is achieved, the ore directly enters an ore dressing, decomposing and crystallizing workshop after being lifted to the ground, the ground ore dressing links are reduced, occupied ground sites are reduced, the working efficiency and the system reliability are improved, and the production cost is reduced. The method is especially suitable for efficient mining of deliquescent solid potassic salt ore.

The invention provides a potassium-dissolving bacteria-iron-based potassium-containing nano material and a preparation method thereof, and belongs to a bio-fertilizer technology, and the preparation method comprises the following steps: dispersing soluble iron salt in water to obtain a solution A; dispersing a soluble phosphoric acid source and potassium salt in water to obtain a solution B; dispersing a stabilizer in water to obtain a solution C; simultaneously dropwise adding the solution A and the solution B into the solution C at the same speed, controlling the pH value to be 2.5-4.0 through alkali liquor, stirring for reaction, standing and aging to obtain the iron-based potassium-containing nano material; inoculating potassium-dissolving bacteria into a liquid culture medium, and carrying out enlarged culture to obtain a bacterial suspension; and mixing the bacterial suspension with the iron-based potassium-containing nano-material to obtain the potassium-dissolving bacteria-iron-based potassium-containing nano-material. The iron-based potassium-containing nano-material contains potassium, the iron-based potassium-containing nano-material and the potassium-dissolving bacteria act together to form a dual potassium supply mechanism that the potassium-dissolving bacteria decompose soil potassium and the iron-based potassium-containing nano-material releases potassium, and the effect is far better than that of single use of a microbial inoculum or a common potash fertilizer.

The application discloses a kind of blending fertilizer raw material potash fertilizer and its preparation method, including the following weight parts of raw materials: 980 parts of potassium sulfate powder, 3 parts of zinc sulfate monohydrate, 10 parts of magnesium sulfate heptahydrate, 2 parts of sodium octaborate tetrahydrate, 1 part of DA-7, 4 parts of alginic polysaccharide.Seven water magnesium sulfate replenishes magnesium element, promotes the synthesis of carbohydrates, fats and proteins, is essential to maintain the green and healthy growth of crop leaves, and is conducive to improving the overall growth vigor and yield of crops.Four water sodium octaborate provides boron element, can promote pollen germination and pollen tube elongation, improve the flowering rate of crops, reduce the phenomenon of flower and fruit drop, DA-7 can promote plant cell division and elongation, improve the photosynthetic efficiency of plants, enhance the stress resistance and nutrient absorption capacity of plants, make crops grow more robustly, and improve fertilizer utilization.

The application discloses a construction method for rapid excavation of a potassium salt mine, and comprises the following steps: excavation branch roadway planning, excavation preparation of a first area, excavation of the first area, excavation preparation of a second area, excavation of the second area, excavation preparation of a third area, excavation of the third area, and after the completion of the excavation operation, repeating the above steps to move to the next excavation face for excavation. The application solves the problems of discontinuous post-excavation transportation, difficult and long period of moving and inverting the face, realizes rapid excavation of the roadway, rapid transportation of materials and rapid moving of equipment, and improves the excavation efficiency of the whole mining area.

The invention provides a method, a system and equipment for generating a special fertilizer formula for crops. The method comprises the following steps: acquiring crop growth data of any region; constructing a nitrogen fertilizer recommendation model according to the crop growth data, and obtaining a nitrogen application amount prediction value and a yield prediction value; constructing a phosphate fertilizer recommendation model based on a phosphate fertilizer grading standard according to the yield prediction value and the actually measured data of the content of the rapidly available phosphorus in the soil, and obtaining a phosphorus application amount prediction value; establishing a potash fertilizer recommendation model based on a potash fertilizer grading standard, and obtaining a potassium application amount prediction value; respectively calculating the base fertilizer amount and the topdressing amount of nitrogen, phosphorus and potassium according to the predicted value of the nitrogen application amount, the predicted value of the phosphorus application amount, the predicted value of the potassium application amount and the base-topdressing ratio; constructing a base fertilizer formula model according to the base fertilizer amount of nitrogen, phosphorus and potassium; and constructing a dynamic adjustment model according to the topdressing amount of nitrogen, phosphorus and potassium, and calculating a topdressing correction value. The method can accurately and efficiently formulate a fertilization strategy which is suitable for crops, lands and conditions, obviously improves the utilization efficiency of the fertilizer, and reduces excessive application.

The invention discloses a method for recovering vegetation of a mildly-degraded Coilin grassland. The method comprises the following steps: S1, investigating plant community characteristics and biomass; s2, determining the quality of the forage grass in the plant community; s3, collecting a soil sample; s4, reseeding: grass seeds are reseeded on the mildly degraded Coilin grassland, the reseeded grass seeds are agropyron perennioides and adsura adsura, and the mass ratio of the agropyron perennioides to the adsura adsura is (6-8): (2.5-3.5); the reseeding amount is 10-20 kg / hm < 2 >; s5, fertilization: applying a fertilizer bag, the fertilizer bag being a nitrogen-phosphorus-potassium mixed fertilizer, the nitrogen-phosphorus-potassium mixed fertilizer comprising a nitrogen fertilizer, a phosphorus fertilizer and a potash fertilizer, according to the plant community conditions of the mildly degraded Coilsein grassland, through reseeding and reasonable fertilization, the monoennial and biennial plants, perennial gramineae, hybrid grass and perennial leguminous plants of the Coilsein grassland can all grow, the yield of the Coilsein grassland is increased, and the yield of the Coilsein grassland is increased. And the pH value of the soil tends to be neutral, so that the mildly degraded Coilin grassland vegetation is recovered.

The invention discloses a nutrient element combined application combination for improving yield and quality of pinellia ternate and an application method. The nutrient element combined application combination comprises urea, calcium superphosphate, potassium sulfate, EDTA chelated copper, disodium octaborate tetrahydrate and sodium molybdate. The application method comprises the following steps: applying nitrogenous fertilizer and phosphatic fertilizer during sowing in April, applying nitrogenous fertilizer, phosphatic fertilizer, potash fertilizer, copper fertilizer, boric fertilizer and molybdenum fertilizer from June to July, and applying potash fertilizer, copper fertilizer, boric fertilizer and molybdenum fertilizer in August; according to the method, orthogonal experimental design is adopted, the nutrient element combined application combination most suitable for pinellia ternata production is obtained, the application method of the combined application combination designed by the invention is simple, convenient and easy to control, the yield of pinellia ternata can reach a relatively high level, the yield is 14619.42 kg: hm <-2 >, and the difference (P is less than 0.5) between the yield and the highest yield (14901.40 kg. Hm <-2 >) of the element combined application combination is not obvious.

A fertiliser product comprising potassium sulfate (sulfate of potash or “SOP”) and boron, wherein the amount of boron is equivalent to 0.2 to 3.0 wt. % B.

A water interception trench structure and construction method suitable for waterproofing the exterior of potash mine shafts are disclosed. The structure includes a shaft and a shaft wall, and further includes an embedded water storage bag, a water supply pipe, a water storage box, a water outlet pipe, a wall base, and an observation cylinder. The embedded water storage bag is located on the side of the shaft wall and below the soil water level to collect water flowing downwards from the soil layer through the outer wall of the shaft. The water storage box is located inside the wall base. The bottom of the embedded water storage bag has a water outlet hole. One end of the water supply pipe is connected to the water outlet hole and the other end is connected to the water storage box. One end of the water outlet pipe is connected to the water storage box and the other end is connected to the observation cylinder. The observation cylinder is installed on the side of the shaft wall near the shaft. The embedded water storage bag and the shaft wall are integrally cast with concrete, the water storage box and the wall base are integrally cast with concrete, and the wall base and the shaft are integrally cast with concrete. This invention has the advantages of simple construction, accurate monitoring, reusability, and cost savings, and has wide applicability and promotional value in the field of waterproofing potash mine shafts.

The invention relates to the technical field of soil fertility improvement, and discloses a soil fertility improvement method for supplementing cultivated land soil. The soil fertility improvement method comprises the following steps: S1, applying a base fertilizer I in a wheat season, and dressing a quick-acting inorganic nitrogen fertilizer or a phosphorus-potassium compound fertilizer; s2, after wheat is harvested, straws are separated from the field, and wheat stubbles are ploughed after a decomposition agent is added; s3, base fertilizer II is applied in the soybean season, and quick-acting inorganic nitrogen fertilizer and phosphorus-potassium compound fertilizer are topdressed; s4, after the soybeans are harvested, straw is separated from the field, and stubbles are smashed and returned to the field; wherein in the step S1, the base fertilizer I comprises decomposed manure and a potassium sulfate type compound fertilizer; in the step S2, the base fertilizer II comprises decomposed manure, a quick-acting inorganic nitrogen fertilizer, a water-soluble phosphate fertilizer and a potash fertilizer; in the base fertilizer I and the base fertilizer II, the decomposed manure is prepared by fermenting animal manure, straws, mushroom residues and a complex microbial inoculant. By means of the soil fertility improving method, the nutrient indexes such as soil organic matter and total nitrogen can be obviously improved, and the good soil fertility improving effect is achieved.

The application provides a ceramic raw material iron red glaze and a preparation method thereof, and belongs to the technical field of inorganic material preparation. The ceramic raw material iron red glaze comprises the following components in parts by weight: 15.5-17.5 parts of potash feldspar, 22.5-23.5 parts of soda feldspar, 7-8 parts of white kaolin in Panxi region, 14-18 parts of quartz, 6-7 parts of calcite, 10-12 parts of calcined talc, 10-12 parts of bone powder and 14-16 parts of vanadium titanium magnetite. The bone powder comprises the following components in percentage by mass: 0.85-2.35% of SiO2, 0.36-0.74% of Al2O3, 44.56-46.75% of CaO, 0.76-1.50% of MgO, 0.03-0.12% of K2O, 0.53-0.86% of Na2O, 0.12-0.14% of Fe2O3, 0.03-0.05% of TiO2, 36.76-48.79% of P2O5, and the balance of inevitable impurities. The iron red glaze provided by the application is bright and dynamic, rich in changes, and has yellow silk-like flow lines interspersed in the sheet of fire red color, which is colorful and makes the whole vessel have the quality of being rare, noble and dignified. The application is mainly used for tea bowls, cups and other tea utensils, and can also be used for bowls, plates, toys, ink stones and other living utensils.

The invention relates to the technical field of agricultural technologies, and discloses a perlite water and fertilizer retention slow release fertilizer which is prepared from the following components in parts by weight: 10-30 parts of a chemical fertilizer, 5-20 parts of a phosphate fertilizer, 5-20 parts of a potash fertilizer, 20-50 parts of water and 10-40 parts of perlite, according to the preparation method, the porous perlite is used as a fertilizer carrier, the core problem of low fertilizer utilization rate is effectively solved, leaching and runoff loss of soluble nutrients such as nitrogen and potassium in the early stage of crop growth are remarkably reduced, it is ensured that the fertilizer can be fully absorbed in the critical period of fertilizer demand of nursery stocks, the fertilizer utilization rate is greatly increased, and the yield of the nursery stocks is increased. The agricultural production cost is reduced, and the environmental pressure such as water eutrophication caused by nutrient loss is relieved from the source.

The invention provides a rare-earth slow-release fertilizer as well as a preparation method and application thereof. The rare-earth slow-release fertilizer comprises rare-earth slow-release particles and a basic fertilizer, the rare earth sustained-release particle comprises an inner core formed by rare earth ions and a chelating agent, and a coating layer coating the inner core, the chelating agent comprises unsubstituted and / or alkyl substituted dithiocarbamate; the basic fertilizer comprises any one or a combination of at least two of nitrogenous fertilizer, phosphatic fertilizer or potash fertilizer. The rare earth slow-release fertilizer provided by the invention realizes gradient release of rare earth ions, has slow-release stability in a wide pH range, reduces soil rare earth loss, improves the bioavailability of the rare earth ions, and reduces the risk of environmental pollution.

The invention relates to a hydraulic support structural member anti-corrosion treatment method suitable for potassic salt ore, which comprises the following steps: S1, pretreatment; s2, loading an oxide ceramic precursor on the clean structural member, and heating and decomposing to form a compact barrier layer to obtain a primary structural member; the resistivity of the barrier layer is in the range of 1 * 10 < 6 >-1 * 10 < 9 > omega.cm; s3, coating the surface of the primary structural member with a coupling agent to obtain a secondary structural member; s4, the surface of the second-level structural part is coated with conductive putty, and a third-level structural part is obtained; and S5, anti-corrosion paint dry powder is electrostatically sprayed on the third-stage structural part, an anti-corrosion coating is formed through curing, and the hydraulic support structural part subjected to anti-corrosion treatment is obtained. The technical problems that in the prior art, a coating of a hydraulic support structural part is poor in protection effect under the corrosive environment with high permeability, corrosive substances can easily penetrate through the coating, and the adhesive force is reduced too fast in the using process are solved.

This utility model relates to an online automatic sampling concentration identification system for potash fertilizer. Each first inlet pipe is equipped with a sampling pump. The inlet of the first inlet pipe is connected to an external sampling pool, and the outlet of the first inlet pipe is connected to a main inlet. A camera is positioned to target the detection container. A main cleaning valve is installed at the outlet of the main cleaning pipe. The inlets of two or more cleaning branch pipes are connected to the main cleaning pipe, and the outlet of each cleaning branch pipe is connected to the cleaning port of one of the first inlet pipes. This technical solution uses two or more first inlet pipes and corresponding sampling pumps, allowing potash fertilizer samples from different sampling pools to sequentially enter the detection container for photographing and detection. The automated control is more intelligent, reducing manual intervention and improving sampling efficiency. Furthermore, a cleaning module is included to clean the inlet pipes and sampling pumps, preventing blockage caused by potash fertilizer crystallization after long-term use.

The invention discloses a fertilizer composition and a use method thereof, and belongs to the technical field of rape planting. The fertilizer composition comprises a nitrogen fertilizer, a phosphate fertilizer and a potash fertilizer which are respectively applied to a shallow soil area and a deep soil area. The invention further provides an application method of the fertilizer composition. The application method comprises the following steps: applying the nitrogen fertilizer, the phosphate fertilizer and the potash fertilizer to a shallow area and a deep area of soil after direct seeding of rape seeds in a layered manner. The fertilizer composition provided by the invention can significantly improve the lodging resistance of rape.

The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a xylitol and microorganism synergistically chelated liquid fertilizer and a preparation method thereof.The xylitol and microorganism synergistically chelated liquid fertilizer is prepared from, by mass, 5%-15% of xylitol, 1%-5% of functional microorganism strains, 3%-8% of nitrogenous fertilizer, 2%-6% of phosphate fertilizer, 4%-10% of potash fertilizer, 5%-15% of medium trace element fertilizer, 2%-3% of blood protein peptide, 3%-5% of glutamic acid, 3%-5% of mineral source potassium humate, 0.5%-2% of biological stabilizer and the balance water. And the balance of water. Wherein the xylitol, the functional microbial strain, the nitrogen fertilizer, the phosphorus fertilizer, the potassium fertilizer, the medium trace element fertilizer, the blood protein peptide, the glutamic acid and the mineral source potassium humate form a complex.

The invention discloses a potassium sulfate fertilizer preparation method, and particularly relates to the technical field of potassium sulfate fertilizer preparation, and the method comprises the following steps: mixing potassium feldspar mineral powder with a specific composite catalyst, introducing the mixture and pretreated sulfur dioxide-containing industrial tail gas into a fluidized bed reactor, and carrying out catalytic oxidation-sulfation reaction at 380-430 DEG C to obtain the potassium sulfate fertilizer. And separating, leaching, crystallizing and drying the solid product to obtain a final product. According to the method, tail gas treatment and mineral resource utilization are combined, waste is treated with waste, the process conditions are mild, the prepared potassium sulfate product is high in purity and low in chlorine content and has excellent anti-caking and anti-moisture-absorption physical stability, and meanwhile efficient conversion of sulfur dioxide and high-yield extraction of potassium resources are achieved.

A roller press comprising including a roller face defining a plurality of individual reliefs shaped and sized to compress feed material into a plurality of discrete briquettes, each of the individual reliefs defining a quadrilateral shaped depression having rounded corners to reduce stress concentrations in the resulting briquettes, wherein a pair of leading edge rounded corners are defined by a first radius and a pair of trailing edge rounded corners are defined by a second radius, the first radius being smaller than the second radius.

The invention relates to the technical field of intelligent agricultural power machinery, and discloses a quantitative fertilization device for agricultural planting and a fertilization method.The quantitative fertilization device comprises a mixing barrel, a storage tank, a quantitative conveying mechanism, a mixing mechanism and an intelligent all-in-one machine, and a water feeding opening and a water discharging opening are formed in the mixing barrel; according to the quantitative fertilization device, the storage tanks, the weighing table, the electromagnetic valve and the intelligent all-in-one machine are arranged, accurate quantitative control over three solid fertilizers including nitrogen fertilizer, phosphate fertilizer and potash fertilizer is achieved, the three storage tanks are arranged to store different types of solid fertilizers respectively, and the weighing table is matched for detecting the weight change of the storage tanks in real time; when the weight drop value of the storage tank reaches a preset quantitative value, the intelligent all-in-one machine can automatically control the electromagnetic valve to be closed, quantitative fertilizer output can be completed without manual weighing, the differential requirements of different crops for the nitrogen-phosphorus-potassium ratio are met, the fertilization amount can be flexibly adjusted according to the planting area, manual operation errors are effectively avoided, and the planting efficiency is improved. And the fertilization precision is improved.

The invention relates to an antibacterial ceramic closestool and a manufacturing process thereof, and belongs to the technical field of ceramic closestools. The manufacturing process of the antibacterial ceramic closestool comprises the following steps: putting potassium feldspar, albite, quartz powder, calcined kaolin, talcum powder, glass powder, zinc oxide, magnesite, calcite, zirconium silicate and illite-based antibacterial particles into a material tank of a ball mill, then adding sodium carboxymethyl cellulose and deionized water, uniformly mixing, and carrying out ball milling treatment to obtain glaze slip; and glazing the glaze slip on the surface of a ceramic closestool green body in a glaze dipping manner to obtain a glaze layer, naturally airing, carrying out heat treatment, and then cooling along with a furnace to obtain the antibacterial ceramic closestool. Stable adsorption and slow release of antibacterial metal ions can be achieved through the glaze layer, the long-acting antibacterial performance capable of resisting washing of a disinfectant is provided for the antibacterial ceramic closestool, the wear resistance of the antibacterial ceramic closestool is enhanced by optimizing the glaze layer structure, finally, the antibacterial performance and the wear resistance are synergistically improved, and the long-term use effect of the closestool is guaranteed.

The invention discloses a composite soil conditioner, which is prepared from the following ingredients in parts by weight: 30 to 40 parts of calcium superphosphate, 20 to 25 parts of powdery humic acid, 20 to 25 parts of fulvic acid metal complexes, 10 to 25 parts of jarosite and 5 to 8 parts of lignosulfonate. The invention also provides a preparation method and application of the composite soil conditioner. The invention provides a composite soil conditioner and a preparation method and application thereof, jarosite is introduced as a potash fertilizer slow-release carrier, lignosulfonate is added as a bonding and dispersion medium, the composite soil conditioner can realize continuous release of potassium ions, and meanwhile, the potassium ions can be continuously released. After the potassium is released, a residual mineral skeleton and calcium ions and organic matters in the soil generate a cementation effect to jointly promote the formation of a water-stable aggregate structure, so that the synergistic improvement of potassium slow-release supply and soil structure construction is realized.

The utility model relates to the technical field of potash fertilizer production equipment, in particular to a double-roller extrusion granulator for potash fertilizer production, which comprises a box body, a feeding groove fixedly connected with the upper end of the box body, a double-roller extrusion granulation mechanism and a screening mechanism arranged in the box body, a power mechanism arranged on the rear side of the box body, and a transmission mechanism arranged on the rear side of the box body, and the power mechanism is used for providing power for the double-roller extrusion granulation mechanism. According to the utility model, when a powdery potash fertilizer raw material is granulated, the powdery potash fertilizer raw material is granulated by utilizing the double-roller extrusion granulation mechanism, and after granulation is finished, the granulated potash fertilizer can be directly screened under the cooperation of the screening mechanism because the screening mechanism is positioned at the lower end of the double-roller extrusion granulation mechanism; therefore, powdery potash fertilizer and granular potash fertilizer can be separated easily, and production efficiency is improved due to integration of potash fertilizer granulation and screening during granulation production of the potash fertilizer.

The application provides a double cutter disc angle adjustable structure, method and full-face tunneling machine suitable for potash salt mine, and relates to the technical field of full-face mechanized mining equipment for solid potash salt mine and other sedimentary layered deposits. The structure comprises two cutter disc assemblies arranged symmetrically left and right, wherein the output end of a main cutting gear box is rigidly connected with the cutter disc; a driving assembly is arranged on the frame of the full-face tunneling machine and is connected with the main cutting gear box; the two ends of an angle adjusting mechanism are respectively connected with the frame and the side wall of the main cutting gear box, and are used for driving the main cutting gear box to rotate around the vertical central axis thereof relative to the frame, so that the cutter disc is inclined outward relative to the tunneling direction in the horizontal plane; and the structure further comprises a controller which is respectively connected in communication with the driving assembly and the angle adjusting mechanism. The double cutter disc is inclined to form a certain outward inclination angle, the active cutting of the ground stress chain and the stress dimension reduction are realized, the rock breaking specific energy is reduced, and the cutting efficiency is improved.

The application discloses a method for preparing potash magnesium fertilizer by using potassium salt sylvite, and comprises the following steps: (1) adding raw materials; (2) stirring and converting by heating; (3) separating mother liquor by belt vacuum filtration and keeping warm; (4) cooling and crystallizing the mother liquor by heating; (5) ore flotation; (6) product washing and drying; and (7) tailing treatment. + , Mg 2+ , SO4 2‑ resources to a tailing pond, resulting in resource loss; or the fine crystals of bloedite are precipitated by cooling in the flotation process of the mother liquor by heating, the flotation environment is deteriorated, the concentrate quality is reduced, and filtration is difficult, so that fine treatment of resources is realized; the method is simple, the problem of difficult conversion of the potassium salt sylvite is avoided, the product quality is good, the production efficiency is high, the resource utilization rate is high, and the economic benefit is good.

This application discloses a method for backfilling mining of solid potash mines, belonging to the field of mining engineering technology. The method includes: arranging preparatory work; collecting rock mechanics parameters of the potash ore body and determining the mining method design based on these parameters; the rock mechanics parameters include the instantaneous compressive strength of the surrounding rock, the ore body integrity coefficient, and the allowable subsidence of the roof and floor; the mining method design includes mining sequence design, goaf backfilling design, and mining safety factor correction design. This application achieves a balance between mining efficiency and economic efficiency under the premise of safe mining by independently assessing the safety of three main rock mechanics parameters of potash mines and designing the corresponding steps separately based on the independent assessment results. This provides a safe and economical mining process design method for the special geological conditions of potash mines.