84results about "Pulp liquor regeneration" patented technology

The invention discloses a manufacturing method of an environment-friendly paper product. The environment-friendly paper product is prepared from the following raw materials in parts by mass: 60-70 parts of a main fiber raw material, 25-35 parts of an auxiliary fiber raw material, 3-8 parts of an environment-friendly additive and 1-2 parts of a pretreating agent. By means of the components, by adding the auxiliary fiber raw materials, the environmental protection property is remarkably improved, waste cotton and linen and agricultural waste are converted into papermaking raw materials, consumption of primary fibers is reduced, meanwhile, waste recycling is achieved, and pollution caused by incineration and landfill is reduced. The auxiliary fibers and the main fibers have a synergistic effect and are matched with the environment-friendly auxiliaries to reinforce the quality of the paper, the cotton and linen fibers improve the flexibility, the agricultural waste fibers enhance the stiffness, lignin and short fibers are separated through low-temperature pyrolysis, impurities are prevented from affecting the performance of the paper, and solid powder rich in the lignin and the short fibers is recycled and reused.

The present invention provides a method for recovering white liquor and a white liquor separation accelerator that makes it possible to reduce the amount of white liquor contained in the lime mud after recovering the white liquor from the emulsion, thereby enabling the separation and recovery of more white liquor from the lime mud. [Solution] The method for recovering white liquor includes a white liquor treatment step of recovering white liquor by separating the lime sludge from the emulsion, which is a mixture of white liquor and lime sludge generated during the manufacture of kraft pulp, by filtration, and further includes a separation enhancement step of adding a white liquor separation enhancer, which contains at least a nonionic surfactant and promotes the separation of lime sludge and white liquor in the emulsion, to the emulsion before or during the white liquor treatment step.

The invention relates to the technical field of waste paper pulping, and discloses a water closed cycle waste paper pulping mechanism which comprises a support and further comprises an impurity removal box, a spraying box and a treatment box which are sequentially installed on the support from top to bottom. A mixing cylinder used for mixing repulping and a diluting component are installed in the treatment box, a spraying plate is arranged in the spraying box and used for spraying a solution into the treatment box, a conveying pipeline communicated with the treatment box is arranged on the outer side in the impurity removal box, the solution is conveyed into the impurity removal box through a water pump, and an air flotation component is arranged in the impurity removal box. Wastewater is reused, closed circulation of the wastewater is achieved, repulping is limited by the mixing cylinder, the wastewater in the circulation process does not need to be additionally filtered, in the wastewater reuse process, a large amount of repulping is diluted by a small amount of recycled wastewater, and the wastewater is recycled. Meanwhile, the solution can be circulated while being diluted, so that the discharge of wastewater is reduced.

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 reconfigurable sorting facility is disclosed, including: a plurality of sorting facility devices; and one or more processors configured to: store physical layout information that describes corresponding positions of the plurality of sorting facility devices within a sorting facility; collect feedback data from the plurality of sorting facility devices; and identify at least a subset of the plurality of sorting facility devices to reconfigure based at least in part on the collected feedback data and respective positions of the subset of the plurality of sorting facility devices.

The invention provides a composite metal catalyst and application thereof in biological combined light treatment paper pulp bleaching. The method comprises the following steps: dividing and brooming cooked paper pulp fibers by adopting biological pretreatment, and then carrying out illumination bleaching under simulated sunlight irradiation by adopting a metal photocatalyst (ZnO, ZFO, ZAO, ZMO and the like). According to the mild treatment method, the whiteness of the paper pulp is improved, and meanwhile it is guaranteed that fibers are not damaged. Compared with traditional chemical bleaching, biological combined light treatment bleaching has the advantages that the content of pollutants in wastewater is greatly reduced, meanwhile, reacted metal oxides can be recycled, and the combined treatment method can be used as a novel paper pulp fiber bleaching mode.

The present disclosure is directed to a method for repulping lignocellulosic fibers having at least one wet strength resin disposed thereon, the method comprising: b) preparing an aqueous slurry comprising (1) the lignocellulosic fiber, (2) the resin, and (3) an enzymatic agent present in an amount of from about 0.01 to about 1 wt.%, based on the dry weight of the lignocellulosic fiber, wherein the enzymatic agent comprises: i) at least one hemicellulase; and, ii) at least one cellulase; and, c) agitating the slurry.

The present invention relates to a system for treating delignified cellulose pulp, comprising: consecutive first and second washing devices configured to receive and wash delignified cellulose pulp; an acidic bleaching device arranged to receive cellulose pulp from the second washing device; the post-acid-bleaching washing device is connected to the acid bleaching device and is used for washing the cellulose pulp received from the acid bleaching device; an alkaline bleaching device arranged downstream of the washing device; the alkaline bleaching post-washing device is connected to the alkaline bleaching device and is used for washing the cellulose pulp received from the alkaline bleaching device; a filtrate feeding means arranged to recycle the waste washing liquid from the post-alkaline-bleaching washing means as a diluent between the first washing means and the second washing means and / or as a washing liquid to the first washing means; and a source of water and / or condensate connected to the second washing device to provide a washing liquid.

A method for making precipitated calcium carbonate is provided. The process includes providing a suspension having calcium hydroxide and adding a processed lime mud to the suspension prior to the completion of carbonation to precipitate calcium carbonate.

This invention provides a low-cost and environmentally friendly papermaking pulping process, comprising the following steps: S1. Pretreatment of papermaking fiber plant raw materials. S2. Oxy-alkali cooking: The pretreated papermaking fiber plant raw materials are mixed with an aqueous sodium carbonate solution, and cooked for 0.5–5 hours using oxygen as an oxidant. Then, sodium hydroxide is added, and cooking continues for 0.3–2 hours. Finally, the pulp and black liquor are separated by pressing. S3. Black liquor treatment: The black liquor is mixed with fiber waste, pressed, and burned as biomass fuel. S4. Recovery and causticization. This papermaking pulping process uses sodium carbonate and a small amount of sodium hydroxide for staged oxy-alkali pulping, and the generated black liquor is mixed with fiber waste and burned to recover sodium carbonate and heat, reducing the causticization rate and pulping costs.

The invention provides a clean production process for producing corrugated medium paper by using a waste paper box. The clean production process is characterized by comprising the following steps: step 1, pretreating the waste paper box through special equipment; 2, pulping and repulping: putting the treated waste paper box into special equipment, and controlling the pulping concentration; step 3, screening, purifying and mixing: screening and purifying the slurry through conventional filtering equipment, removing large particles and suspended matters, adding a petrochemical additive, and enhancing the fiber interweaving force through in-pipe mixing and a fibrillation process; the waste paper box is subjected to early-stage pretreatment by arranging special equipment, oiled paper, wax paper and the like influencing subsequent preparation are removed firstly, it is guaranteed that raw materials are clean, and the production quality of corrugated paper is guaranteed; and by designing the fourth step, waste materials and waste mud generated in the corrugated paper production process are fully utilized, resources are efficiently utilized, and waste is prevented.

The utility model relates to the technical field of dewatering devices, in particular to an efficient dewatering device for wood pulp knots, which comprises a storage barrel. The right end of the material storage barrel is fixedly connected with a material inlet, the right end of the material inlet is fixedly connected with the pump body, the right end of the pump body is fixedly connected with a material outlet I, the right end of the material outlet I is provided with a material falling pipe, one end, far away from the material outlet I, of the material falling pipe is fixedly connected with a material falling box, and the lower end of the material falling box is fixedly connected with the dewatering barrel; raw materials are controlled to enter the pump body, the discharging pipe and the discharging box from the feeding port and finally fall into the dewatering barrel, the spiral plate is controlled to rotate, extruded water can fall into the water storage pond through the water outlet hole, the dewatered raw materials can be extruded out of the second discharging port, and the bonded raw materials are blocked by the blocking disc and finally fall into the material storage box. Therefore, workers do not need to continuously add raw materials into the feeding port, and the materials are automatically fed mechanically, so that the dehydration efficiency is improved, and the waste of water resources is also reduced.

The invention discloses a composite modified coal-based solid waste filler as well as a preparation method and application thereof, and belongs to the technical field of inorganic solid waste recycling and green packaging materials. According to the process, the composite modified filler is obtained through multi-step synergistic modification of acid treatment, alkali treatment, silane coupling agent treatment and cationic polymer treatment in sequence; and mixing the filler with defibered plant paper pulp fibers, and carrying out wet molding and drying to obtain the high-performance packaging material. According to the synergistic modification process, high-content (35-55 wt%) filling of the coal-based solid waste is realized, the prepared material has excellent mechanical properties and environmental compatibility, the wet strength retention rate is greater than or equal to 70%, and the water absorption rate is less than or equal to 5%.

An arrangement (1) for treatment of bleaching chemical residues arrangement comprises a detector (2) arranged inside a process flow and configured to measure an amount of sulphite in the process flow by means of spectroscopy. The arrangement (1) further comprises a controller (3) connected to the detector (2) to receive measurement data from the detector (2) and configured to determine an amount of sodium bisulphite in the process flow based on the measurement data, and to control a process related to treatment of bleaching chemical residues based on the determined amount of sodium bisulphite in the process flow.

The invention relates to the technical field of papermaking, and discloses a calcium carboaluminate silicon removal material as well as a preparation method and application thereof. Dispersing CaO in water to obtain lime milk; the preparation method comprises the following steps: respectively dissolving NaAlO2 and Na2CO3 in water, and mixing with lime milk; performing synthesis reaction; and drying and crushing the obtained product to obtain the calcium carboaluminate silicon removal material. The calcium carboaluminate prepared by the method has a regular layered structure, a larger specific surface area of 8.21 m < 2 > / g and a higher crystal water content of 14.14%, so that the calcium carboaluminate shows an excellent silicon removal effect in high-temperature green liquor, and the silicon removal rate can reach 85.36%. The method for removing silicon from the high-temperature green liquor by using the calcium aluminosilicate can be directly used for industrial production, is favorable for improving the silicon removal rate of the high-temperature green liquor, and also has a relatively good calcium aluminosilicate sedimentation effect.

This specification relates to a method of producing regenerated cellulosic material for example for use in textile industry. The method enables utilization of a residue or side stream of a pulp mill. The method comprises providing cellulose material (1), dissolving (2) the cellulose material (1) in an alkaline solution at a temperature of 5 degrees C or lower so as to form a suspension, providing sodium sesquisulfate (6) produced as a waste stream in a chlorine dioxide plant of a pulp mill (4) for use in a regeneration solution (7) and extruding (3) the suspension into a regeneration solution (7) comprising sodium sesquisulfate (6) so as to form regenerated cellulosic material (8).

Methods and compositions for inhibiting scale in papermaking processes are provided. The methods may include adding an effective amount of a terpolymer composition to an aqueous medium in the papermaking process. The terpolymer may include various monomers, such as maleic anhydride, acrylic acid, and methacrylic acid. As an illustrative, non-limiting example, the weight average molecular weight of the terpolymer may be from about 5,000 Da to about 20,000 Da.

The utility model provides a device for separating and grading lignin from black liquor. A stirring device is arranged from the top to the bottom of the device in a penetrating manner; the device comprises a sample introduction part, a separation part and a discharge part which are sequentially arranged from top to bottom along the axial direction of the stirring device, wherein the number of the separation part is more than or equal to 1; the sample introduction part comprises a sample introduction tank and a sample introduction part mixer, and a heavy phase sample introduction port and a light phase outlet are formed in the side wall of the sample introduction part; the separation part comprises a separation tank and a separation part mixer; a clarified liquid outlet and a clarified liquid inlet are formed in the side wall of the separation tank; the discharging part comprises a discharging tank, and a heavy liquid outlet and a light liquid inlet are formed in the side wall of the discharging tank; the stirring device comprises a stirring shaft and at least two stirring parts, and the stirring parts are respectively in one-to-one correspondence with the sample introduction part mixer and the separation part mixer.

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 invention discloses a super-hydrophobic paper-based coating as well as a preparation method and application thereof. The preparation method comprises the following steps: filtering papermaking black liquor, heating to 40-80 DEG C, dropwise adding sulfuric acid to adjust the pH value to 2-6, carrying out centrifugal precipitation, washing with acidic deionized water, and drying to obtain sulfate lignin; the method comprises the following steps: reacting sulfate lignin with acyl chloride with the carbon chain length of C6-C18 in an anhydrous pyridine solvent at the reaction temperature of 80-110 DEG C at the stirring rate of 300 rpm for 3-6 hours to obtain esterified lignin; the esterified lignin is dissolved in acetone and then sprayed on the surface of the paper, and the coating weight is controlled to be 2-7 g / m. The surface free energy can be accurately regulated and controlled by adjusting the length (C6-C18) of an acyl chloride carbon chain, the regulation and control range of a contact angle is 135-162 degrees, and the requirements of different application scenes are met.

The efficient slag slurry sorting machine comprises a sorting tank, a filtering barrel used for slag slurry sorting is arranged in the sorting tank, a slag pumping assembly is arranged in the filtering barrel, a driving mechanism is arranged at the bottom of the sorting tank, and the top end of the driving mechanism penetrates through the sorting tank and is connected with the bottom of the filtering barrel in an inserted mode. The dust collector is fixedly connected to one end of the residue pumping assembly and used for controlling the residue pumping assembly to pump residues on the inner wall of the filtering barrel, and the adjusting assembly is fixedly arranged on the outer wall of the sorting tank. According to the scheme, the driving mechanism is started to control the filter barrel to rotate, so that the slag slurry can be centrifugally sorted, stone particles and other impurities mixed in the slag slurry can be filtered in the filter barrel to be collected, and the dust collector is started to control the slag pumping assembly to pump and clean impurity waste residues attached to the inner wall of the filter barrel; therefore, the mode of manual cleaning can be replaced, manpower can be saved, and meanwhile, the cleaning effect on the filtering barrel can be enhanced.

The present disclosure relates to a method of treating an aqueous foamable medium, such as a process stream of a pulping and paper mill, comprising contacting the aqueous process stream with a defoaming agent comprising: a) at least one C12 to C40 Guerbet alcohol; and / or b) at least one polyol ester.

The invention discloses a preparation method of a high-strength high-barrier closed-loop recyclable waterborne polyurethane paper composite material and application of the high-strength high-barrier closed-loop recyclable waterborne polyurethane paper composite material in a mulching film. The water-based polyurethane paper composite material is prepared by the following steps: firstly, preparing a prepolymer from a hydroxyl-terminated polyalcohol compound and a diisocyanate compound with specific composition, then preparing the prepolymer into a water-based polyurethane emulsion, adding a cross-linking agent with the solid content of polyurethane of 2.5-3.5 wt% and a wetting agent with the solid content of polyurethane of 0.8-1.2 wt%, coating or impregnating a paper-based material, curing at 60-80 DEG C for 10-20 minutes, and then hot-pressing at 140-150 DEG C and 10-17 MPa for 20-30 seconds, thereby obtaining the water-based polyurethane paper composite material. The polyurethane paper composite material is obtained. When the paper-based material is prepared, no special component needs to be added for preparing the mulching film, compared with an existing paper-based mulching film, the mechanical strength is remarkably improved, the water vapor barrier property is remarkably improved, and the biodegradability is good; meanwhile, closed-loop recovery can be achieved, and the energy utilization rate is increased.

Methods to preserve starch present in pulp are disclosed and also methods to control calcium precipitation and / or scaling in digesters or BOD systems. The methods can be performed as part of a papermaking process. Process water containing pulp can be treated with a chloramine. Process water containing pulp with native starch can receive a double treatment with at least one biocide, such as chloramine, and at least one oxidant, such as sodium hypochlorite. The treatment can be performed in any suitable manner. The treatment can be performed at one or more stages or locations in a papermaking system. A target residual chloramine value or range can be achieved by the treatment. Packaging sheets / boards and other paper products manufactured using the methods provided exhibit superior strength and other desirable characteristics.

A reconfigurable sorting facility is disclosed, including: a plurality of sorting facility devices; and one or more processors configured to: store physical layout information that describes corresponding positions of the plurality of sorting facility devices within a sorting facility; collect feedback data from the plurality of sorting facility devices; and identify at least a subset of the plurality of sorting facility devices to reconfigure based at least in part on the collected feedback data and respective positions of the subset of the plurality of sorting facility devices.