38 results about "Pulp mill" patented technology

The present invention relates to a glass paper for stripping interleaving paper, wherein the majority of the fiber ingredients are non-regenerated bleached chemical pulp from hardwood such as birch or eucalyptus. A small amount of recycled pulp produced from release liner glass paper and / or pulp mill broke is used to adjust the characteristics of the fiber ingredients. The invention makes it possible to produce cellophane, wherein the fibrous ingredients do not contain non-recycled chemical pulp produced from cork.

The invention discloses polyacrylamide for a screw press of a pulp paper plant. The polyacrylamide is prepared from the following components in parts by weight: 3 to 10 parts of acrylamide, 1 to 6 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.1 to 3 parts of dimethyl diallyl ammonium chloride, 0.01 to 1 part of hydrophobic modifier, 0.01 to 0.5 part of cross-linking agent and 0.001 to 0.01 part of initiator. The invention also discloses a preparation method of the polyacrylamide. According to the invention, through copolymerization of the composite acrylamide and the salt-resistant monomer and combination of cross-linking modification, the salt resistance, shear resistance and floc strength of polyacrylamide are improved. By introducing hydrophobic groups, the adhesiveness of the filtrate is reduced, backmixing of the squeezed filtrate is reduced, and the dehydration speed and the floc stability are balanced.

Compositions and methods for the removal and prevention of scale in pulp mills in a continuous and real-time process. More particularly the composition includes one or more chelating ligands, one or more copolymers, and one or more surfactants. The scale removing composition is added to the black liquor stream in pulp and paper processes to remove scaling, such as scaling from calcium carbonate, from surfaces in contact with the black liquor stream, such as in digestors and evaporators.

A method for processing a bark press water from sawmills and / or pulp mills is disclosed. According to the disclosure, the method comprisesa) filtration of the bark press water to provide a bark press water filtrate having a particle size of less than 100 μm, and b) concentrating the bark press water filtrate to a level of at least 10% dry weight and thereby providing a first fraction of concentrated bark press water, comprising tannic compounds; and a second fraction of purified bark press water.

Some variations provide a process for producing a nanocellulose material, comprising: providing a biomass feedstock comprising a bleached or unbleached pulp material; fractionating the feedstock in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; and mechanically treating the cellulose-rich solids to form cellulose fibrils and / or cellulose crystals, thereby generating a nanocellulose material. The process is preferably co-located with, or adjacent to, a mill that generates the pulp material. There are several advantages of a bolt-on AVAP® nanocellulose plant to an existing pulp mill, as disclosed herein.

The invention pertains to a process for the removal of a phosphorus-rich lime product from a kraft pulping process, wherein at least one, or at least part of one, phosphorus-containing waste stream from the from the kraft pulping process is purified resulting in a purified water fraction and a phosphorus-containing floc, the obtained dried phosphorus-containing floc is added to the spent liquor recovery process, resulting in a phosphorus-containing lime mud, part of which is removed as a phosphorus-rich lime product with a phosphorus content of at least 2 g / ton and a cadmium content in relation to phosphorus of not more than 100 g Cd / ton P. Further is provided a fertilizer product, comprising the phosphorus-rich lime product as a phosphorus component.

A system and method are provided for predictive control of brown stock treatment at a pulp mill. Various online sensors generate output signals representative of actual values for respective process characteristics, each of which are directly or indirectly affected by adjustments to corresponding process variables. A controller uses the output signals or associated measurement data to dynamically set target values for the process characteristics based on a predicted impact of control responses for corresponding process variables. The controller further generates control signals to actuators associated with the respective process variables based on detected variations between the respective actual values and target values. Exemplary brown stock washing control systems may optimize various types of brown stock washing configurations, including for example vacuum drum washers, compaction baffle washers, chemiwashers, direct displacement washers and wash presses. Cloud-based analytics and machine learning may also be implemented to improve the control algorithms over time.

A method for recovering cellulose from a cellulose containing textile raw material containing dyed textiles, the method comprising subjecting a disintegrated textile raw material to an oxidative pretreatment before alkaline cooking and any further processing of the cellulose pulp obtained after the alkaline cooking. After cooking, spent alkaline cooking solution containing dye and dye residues is withdrawn from the textile derived cellulose pulp and is transferred to a recovery boiler in a Kraft pulp mill. An apparatus for carrying out the method is also disclosed.

The utility model discloses a special welding wide flow channel heat exchanger for pulp mill wastewater, which comprises a heat exchanger main body, the heat exchanger main body comprises a wastewater inlet and a purified water outlet which are arranged on the same side face, the heat exchanger main body further comprises a wastewater outlet and a purified water inlet which are arranged on the other same side face, and a plurality of plate pairs which are arranged at equal intervals are arranged in the heat exchanger main body. Each group of plate pair comprises a first heat exchange plate and a second heat exchange plate which are mutually spaced, the first heat exchange plate and the second heat exchange plate are supported between the first heat exchange plate and the second heat exchange plate through a rod to form a purified water flow channel, a waste water flow channel is formed between any two adjacent plate pairs, and the waste water flow channel is implemented in a manner of no barrier support in the flow channel; the flow direction of a medium in the purified water flow channel and the flow direction of a medium in the waste water flow channel are arranged reversely; efficient full countercurrent flow heat exchange is adopted, the circulation section width of the purified water flow channel and the waste water flow channel is increased, waste water is prevented from being deposited, accumulated and blocked, corresponding overhaul and maintenance are simpler and more convenient, the efficiency of the heat exchanger can be greatly improved, and the service life of the heat exchanger can be greatly prolonged.

The present specification relates to a method for producing regenerated cellulose material, for example for use in the textile industry. The process enables the utilization of pulp mill residues or side streams. The method comprises providing a cellulosic material (1), dissolving (2) said cellulosic material (1) in an alkaline solution at a temperature of 5 degrees Celsius or less, thereby forming a suspension, providing sodium sesquicsulfate (6) produced as a waste stream in a chlorine dioxide plant of a pulp mill (4), using it in a regeneration solution (7), and regenerating the regenerated solution (7). And extruding (3) the suspension into a regeneration solution (7) containing sodium sesquisulfate (6), thereby forming a regenerated cellulosic material (8).

The utility model relates to paper production field, specifically say a kind of rotation shaft sealing kit based on paper pulp refiner, including the dynamic ring rotating with rotation shaft and the static ring being set on refiner shell, the dynamic ring is provided with sealing ring between static ring, the dynamic ring is also provided with sealing compensation module between static ring;The rotation shaft sealing kit based on paper pulp refiner of the utility model, by setting sealing ring between dynamic ring and static ring, and cooperate sealing compensation module, even in long time operation or wear, still can keep good seal, effectively prevent leakage, reduce the material loss caused by leakage, improve production efficiency, while also reduce the risk of environmental pollution, and adopt detachable design, so that daily inspection and replacement are more convenient and fast, reduce maintenance cost.

The utility model relates to the technical field of stone-proof paint production, in particular to a grinding device for stone-like paint production, which comprises a casing, a driving motor arranged at the top of the casing, a support arranged on the outer surface of the casing, a feeding pipeline arranged on one side of the casing, a feeding funnel arranged at the top of the feeding pipeline, and a flow valve arranged inside the feeding funnel. A balancing weight is arranged in the shell, a transmission shaft is arranged in the balancing weight, and a rotating disc is arranged at the bottom of the balancing weight. According to the pulping device for stone-like paint production, through cooperation of a transmission rod, a rotating disc, a grinding wheel and a cutter head, raw material particles can be screened, raw materials are stirred and mixed through the rotating rod after passing through a sieve plate, and the raw materials which do not pass through the sieve plate are lifted to the position of the grinding wheel through the inclined face of the cutter head to be subjected to secondary grinding, so that the size of the raw materials is uniform; and by arranging the flow valve, the feeding amount can be controlled, the mixing proportion can be accurately controlled, and the mixing effect is improved.

A sodium recovery process (1) for recovering sodium salts from recovering sodium salts from ash in an ash treatment plant in a pulping mill, said sodium recovery process comprising the feature of mixing ash from burning of black liquor with a liquid to form an ash suspension by mixing ash and liquid in a ratio between 1:1,5 and 1:4 by weight, said ash suspension subjected to temperature between 40 and 100 degrees °C whereby sodium salts are precipitated and forming a stream of solids separated from the liquid phase, said liquid phase forming a purge (2), the sodium recovery process (1) further includes the steps of: - diluting the purge (2) by addition of 2 % by weight to 60 % by weight of water (8); cooling the purge (2) to a temperature of below 15 °C; - allowing sodium salts to precipitate from the cooled and diluted purge (2); - separating a liquid phase (12) from the precipitated sodium salts (11); - withdrawing the liquid phase (12) from a slurry (16) of the precipitated sodium salts (11).

1. Name of the designed product: a pulp mill. 2. Use of the designed product: for grinding soybean milk. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

The utility model relates to the technical field of pulping machines, in particular to a peeled soybean soaking pulping machine which comprises a pulping box body, a material control box is installed on the top of the pulping box body, a soybean soaking tank is installed on the top of the material control box, a drawing box is installed in the material control box, and a fixed fan plate is installed in the drawing box. A rotating clamping block is installed in the center of the top of the fixed sector plate, a movable sector plate is installed at the top of the fixed sector plate, the rotating clamping block is located in the center of the movable sector plate, and a disassembling assembly is installed on the side wall of the drawing box; the peeled soybean soaking pulping machine has the beneficial effects that the material control box, the drawing box and the dismounting assembly are used in cooperation, the flow of soybeans or water is convenient to adjust and control, the situation that the grinding effect is affected due to excessive soaking of the soybeans in the water is avoided, and meanwhile, the drawing box is convenient to dismount through the dismounting assembly to be cleaned or maintained and replaced.

This invention discloses a method for preparing sodium lignin sulfonate-based porous carbon and its application, belonging to the field of efficient resource utilization of biomass and water treatment technology. The method selects sodium lignin sulfonate waste from pulp mills as a carbon source, and processes it to obtain sodium lignin sulfonate powder; the sodium lignin sulfonate powder is then blended with SiO2 and / or HCO2K and activated to obtain sodium lignin sulfonate-based porous carbon; this carbon is then applied to the removal of antibiotics from water. This invention fully utilizes the waste sodium lignin sulfonate from pulp mills, realizing the recycling of waste, increasing the added value of waste, and the preparation process is simple, pollution-free, environmentally friendly, and in line with green chemistry principles.

The utility model provides a novel ore pulping machine, which relates to the technical field of ore processing, and comprises a shell and a processing mechanism arranged on the outer side of the end part of the shell, the processing mechanism comprises a cover body, the cover body is rotatably connected to the outer side of one end of the shell, one side of the cover body is communicated and connected with a feeding hopper, and the other side of the cover body is communicated and connected with the feeding hopper. A first barrel is rotationally connected to the inner side of the shell, a first bevel gear is fixedly connected to the outer side of one end of the first barrel, a third bevel gear and a connecting shaft are driven to rotate by starting a motor, then a second bevel gear is driven, and the first bevel gear and the third bevel gear rotate relatively; and finally, the second barrel body and the first barrel body on the outer side of the end part of the connecting shaft are driven to rotate relatively, the contact frequency and time of the materials and the pulping component are increased through the relative rotation movement mode, the materials are continuously turned and ground in the relative rotation space, and the required pulping degree can be achieved more quickly.

A novel chemical pulping system is characterized by comprising a presoaking tower, a wood chip pump arranged at the rear end of the presoaking tower, a cooking tower arranged at the rear end of the presoaking tower, a medium-concentration mill arranged at the rear end of the cooking tower, a blow-off pot arranged at the rear end of the cooking tower, a sand remover feeding pump arranged at the rear end of the blow-off pot, and two medium-concentration mills added from a cooking line, various raw materials can be prepared, and various kappa ranges can be selected; and a residue-pulp mill is arranged when the screened pulp residue wood sections are treated to treat and recover the pulp residue wood sections, so that zero emission of harmful solid wastes is realized, the pulping yield is increased, the environment is protected, the benefit is further increased, the selectivity of raw material types is relatively strong, the method can be suitable for cooking various raw materials, the kappa number range of cooking is relatively wide, the energy consumption is saved, and the method is suitable for industrial production. Solid wastes such as slurry residues and wood knots are low in output or are not produced, so that environmental pollution is reduced, and the method is more environment-friendly.

The invention relates to the technical field of advanced process control of an aluminum oxide ore pulp mill, in particular to an advanced process control system and method for the aluminum oxide ore pulp mill. The method comprises the following steps: firstly, classifying aluminum oxide raw ores needing to be ground through an aluminum oxide raw ore classification unit to obtain an aluminum oxide raw ore set with a qualified size and an aluminum oxide raw ore set with an unqualified size; secondly, the aluminum oxide raw ore in the aluminum oxide raw ore set with the unqualified size is smashed through a smashing unit; thirdly, a blending liquid control unit is used for obtaining the proportion of blending liquid according to the aluminum oxide raw ore parameters corresponding to the aluminum oxide raw ore set with the qualified size; then, pulp grinding parameters are obtained through a pulp grinding parameter obtaining unit, and the aluminum oxide raw ore set with the qualified size is subjected to pulp grinding through a pulp grinding unit; and after the pulp grinding time is up, the generated aluminum oxide raw ore pulp is detected through the pulp grinding result detection unit. By means of the system, the pulp grinding effect of aluminum oxide raw ore can be improved.

According to an example aspect of the present invention, there is provided a method of replacing with sodium make-up chemicals sodium losses caused by outflows in a pulp mill which employs a kraft process for producing cellulosic pulp, wherein the pulp mill includes a unit for conversion of sulphurous compounds, which is fed with sulphurous substances of the kraft process to convert said sulphurous substances into oxidized sulphurous compounds, said method comprising using sodium sulphate possibly together with other sodium salts as the main make-up chemical, to achieve an essentially sodium hydroxide free feed of sodium make-up chemicals, and at least a part of the sulphur contained in the sodium sulphate make-up chemical being used for producing oxidized sulphurous compounds in said unit for conversion of sulphurous compounds.

Compositions and methods for the removal and prevention of scale in pulp mills in a continuous and real-time process. More particularly the composition includes one or more chelating ligands, one or more copolymers, and one or more surfactants. The scale removing composition is added to the black liquor stream in pulp and paper processes to remove scaling, such as scaling from calcium carbonate, from surfaces in contact with the black liquor stream, such as in digestors and evaporators.

The invention relates to the technical field of slurry plant odor treatment, in particular to an uninterrupted operation odor treatment system and method.The uninterrupted operation odor treatment system comprises a power supply subsystem, and the power supply subsystem comprises at least one power grid power supply line, an emergency power supply device, a standby generator set and a centralized power supply bus; electric equipment in the odor treatment system is connected to the centralized power supply bus, and the power grid power supply line and the standby generator set are electrically connected with the centralized power supply bus through the emergency power supply device; when the power grid power supply line is in a normal power supply state, the emergency power supply device is in a floating charge state, and the standby generator set is in a standby state; when the power supply lines of the power grid all fail, the emergency power supply device supplies power to the electric equipment and the standby generator set; and under the power supply state of the standby generator set, the emergency power supply device is switched to a floating charge state. Through the uninterrupted power supply, water supply and gas / steam supply system, the uninterrupted operation of the system under the conditions of public facility system faults such as sudden power failure, water failure and gas / steam failure is ensured.

The invention belongs to the technical field of pulping waste gas treatment, and particularly relates to a deodorization device and a deodorization process for treating pollutants in pulping waste gas, the deodorization device comprises a spray tower main body, a spray mechanism is mounted on the spray tower main body, and a separation mechanism and a flow guide mechanism are mounted in the spray tower main body; the separation mechanism comprises a filter cartridge fixedly connected with the inner wall of the spray tower main body, the bottom of the filter cartridge is sealed, after pulping waste gas enters the spray tower main body, particles in the pulping waste gas are separated out through the filter cartridge, and then the spray mechanism sprays out atomized liquid medicine to be mixed with the pulping waste gas with the particles separated out. According to the pulping waste gas treatment device, large-particle-size particles in pulping waste gas can be filtered and separated through the filter cartridge, the large-particle-size particles are prevented from making contact with sprayed liquid medicine, the use amount of the sprayed liquid medicine can be reduced, and meanwhile the sprayed liquid medicine can make more sufficient contact with the pulping waste gas.

The utility model relates to the technical field of pulping machines, and discloses a paper pulp pulping machine with a cooling function, which comprises a bottom plate, a barrel body is fixed at the top end of the bottom plate, a conveying assembly is fixed at the bottom end of the barrel body and used for conveying paper pulp, the conveying assembly comprises a conveying pipe, the conveying pipe is fixed at the bottom end of the barrel body, and a driving motor is fixed at one end of the conveying pipe. One end of an output shaft of the driving motor extends to an inner cavity of the conveying pipe, threaded blades are fixed to the surface of the output shaft, a circulating pipeline is arranged on the surface of the conveying pipe and rotates spirally, connectors are fixed to the positions, at the two ends of the circulating pipeline, of the surface of the conveying pipe, and a separation assembly is fixed to the top end of a bottom plate on the outer side of the barrel. The device is used for separating paper pulp from water.

The application discloses a kind of step-by-step flocculation and precipitation devices for pulp mill wastewater treatment, and specifically relates to the technical field of papermaking wastewater treatment.The application comprises a sedimentation tank one and a sedimentation tank two, and a support frame is installed on the rear sidewall of both.The top wall of the support frame is vertically fixed with a gas cylinder, and a dosing mechanism for feeding flocculants is arranged below the gas cylinder.The application controls the contraction of the gas cylinder to synchronize the opening of the output parts of the solid tank and the liquid tank, which not only completes the feeding of liquid flocculants to preliminarily flocculate the wastewater, but also synchronously completes the advance dissolution of solid flocculants to improve the efficiency of wastewater flocculation and precipitation.Meanwhile, the cleaning of the filter screen of the submersible pump is completed synchronously during the conveying of wastewater to ensure the continuous conveying of wastewater and further improve the efficiency of wastewater flocculation and precipitation.

Systems and methods are provided for predictive control of brown stock handling at a pulp mill. Various online sensors produce output signals representative of actual values of respective process characteristics, each of which is directly or indirectly affected by adjustments to a corresponding process variable. A controller uses the output signals or related measurement data to dynamically set target values for the process characteristics based on predicted effects of control responses to the corresponding process variables. The controller further produces control signals to actuators associated with the corresponding process variables based on detected differences between the respective actual values and the target values. Exemplary brown stock washing control systems can optimize various types of brown stock washing configurations, including, for example, vacuum drum washers, compaction baffle washers, chemical washers, direct displacement washers, and wash presses. Cloud-based analysis and machine learning can also be implemented to improve control algorithms over time.

This invention discloses a cellulose cotton pulp for thermal insulation aerogel and its preparation method, belonging to the field of cellulose technology. The preparation method includes the following steps: Step 1, preparing a sodium hydroxide solution, adding cotton linters to the sodium hydroxide solution for ultrasonic-assisted preimpregnation to obtain a preimpregnated pulp; Step 2, transferring the preimpregnated pulp to a digester, preparing a composite cooking aid, adding the composite cooking aid to the digester, mixing well, and then cooking; Step 3, after cooking, releasing the gas, pulping using a pulping mill, followed by bleaching and washing; Step 4, adding a modifier to the washed pulp, stirring and reacting at 30-60℃ for 1-2 hours, and obtaining cellulose cotton pulp after the reaction. The modifier includes phytic acid-modified hydrotalcite and xylitol, with a mass ratio of 1:1-2. In preparing cellulose cotton pulp, this invention uses ultrasonic preimpregnation, a composite cooking aid to assist alkaline cooking, and modifier treatment to improve the mechanical strength of the cellulose.

The present application relates to a kind of paper pulp mill wood chip drying preparation method and system, specifically, at the head of dryer, buffer bin and supporting components are installed, so that the material to be dried can quickly and smoothly enter the drying cylinder, and the smooth material flow also makes the drying air flow circulate smoothly in the dryer, and by matching the corresponding industrial control parameters, the wood chip drying standard is realized once, the cost is reduced, the efficiency is increased, energy saving and emission reduction are realized.

The invention relates to new solutions for effective recovery of chemicals in a Kraft pulp mill A method for recovering chemicals in a Kraft pulp mill is provided. The method comprises producing green liquor in a recovery boiler, conveying green liquor from the recovery boiler to a green liquor stripper, stripping the green liquor with a gas stream comprising or consisting of CO2 so as to produce a stripper off-gas, feeding the stripper off-gas to a sulfuric acid plant, and producing sulfuric acid from the stripper off-gas. Further, a system as well as use of the same for recovering chemicals in a Kraft pulp mill are provided.

A method for controlling nitrogen flows in a pulp mill which comprises a recovery boiler, a lime kiln, a power boiler and a concentrated non-condensable gases (CNCG) incinerator and / or a wet gas sulfuric acid (WSA) plant is disclosed. Further is disclosed a system for controlling nitrogen flows in a pulp mill.