155results about How to "Improve water filtration performance" patented technology

The invention relates to an oxygen delignification processing method of grass unbleached chemical pulp. The oxygen delignification of the pulp is processed after cooking and before bleaching. Its rigidity before the oxygen delignification is potassium permanganate value 16-28 (equals to karber value 26-50). After pumping into the oxygen delignification reaction tower and inflating sodium hydroxide, magnesium salt and oxygen, the chemical pulp happen the oxygen delignification in the reaction tower. The chemical pulp with rigidity of potassium permanganate value 10-14 (equals to karber value 14-18) is achieved after the oxygen delignification. The invention can remove the lignin in the pulp effectively and the removal rate is 86-98%. It reduces the degradation of the cellulose to simplify the bleaching process and cut down the dosage of the chemicals. The bleached pulp has good rigidity and drainability. The breaking length of the pulp can reach 4500-8000m and its fold-resistant times can reach 20-70.

The invention provides a process for de-inking waste newspaper by a biologic enzyme, which relates to the process of the pulping of waste paper. The process is characterized by comprising the following technological procedures of: (1) preparing a de-inking agent: adding one or several of alkali lipase, amylase and xylanase into cellulase to prepare a composite enzyme and then adding 0.05-0.15 kilogram of surfactant into the composite enzyme with the weight to form the de-inking agent, wherein the composite enzyme comprises the following components in proportion: 2000-10000U of cellulase, 10000-100000U of alkali lipase, 1000-5000U of xylanase and 8000-15000U of amylase; (2) pulping by using a high-concentration pulper: adding 40-60 DEG C water into the high-concentration pulper, counting by 100 kilograms of absolutely dry paper, putting 10-150 grams of de-inking agent and 0.2-0.4 kilogram of sodium metassilicate nonahydrate into waste newspaper and journal paper and stopping after starting the pulper for 10-30 minutes; and (3) carrying out the procedures of floatation and printing ink separation to obtain the de-inked pulp. The invention has the advantages that sodium hydroxide and hydrogen peroxide are not used, and the production cost and the wastewater pollution are lowered.

The invention provides a method for improving the performance of paper stock in retention and drainage aiding. The method comprises the following steps: firstly, dispersing plant fiber materials for papermaking in water, beating the plant fiber materials with the beating degree being controlled to 25 to 70 DEG SR (Schopper-Riegler); secondly, feeding the evenly mixed slurry into the approach flow system of a paper machine, and adding CPAM (cationic polyacrylamide) as retention agent before feeding the slurry into a fan pump of the approach flow system; then, adding electronegative bentonite before feeding the slurry into a pressure screen or a head box, and adding APAM (anionic polyacrylamide) before feeding the slurry into the head box; and finally, papermaking forming on the paper machine, drying and obtaining the qualified paper. By adding excessive CPAM to the paper machine, the invention allows the action between CPAM and bentonite to form fine particles, and the further combination with APAM to form floccules, thereby providing draining channels in good conditions and further improving the drainage capacity during the forming process of the paper stock.

This invention relates to a synthesis method of quaternary ammonium cationic starch, which takes starch, quaternary ammonium, and sodium hydroxide as raw materials in water medium, and conducts eight steps of conditioning, alkalization, etherification, neutralization, washing, drying, screening, and packaging. The product is white powder, and gels to be the thick translucent gel heated to 50~66deg.C in water with DS values of 0.01 to 0.05. This invention is reasonable, makes the general starch has cationic performance and higher substitution, lowers the gelatinization temperature and freezing, so its effect can completely achieve the requirement of paper industry.

The invention discloses a rotary filter screen type bar screen cleaner. The rotary filter screen type bar screen cleaner comprises a frame, a driving device, a transmission chain, two main chain wheels, a main shaft, a cleaning brush, an air inlet pipe, an air nozzle, two traction chains, two secondary chain wheels, a filter frame, a filter screen, a mesh plate, a water stopping plate, and an air compressor; the driving device is fixedly connected to a top plate of the frame, the main shaft is fixed on a side plate of the frame; one end of the transmission chain is sleeved on a power output shaft of the driving device, and the other end is sleeved on a power input end of the main shaft; the main chain wheels are fixedly connected to the main shaft, and the secondary chain wheels are fixed to the lower part of the frame; two traction chains are respectively sleeved to one main chain wheel and one secondary chain wheel; the end part of the filter frame is fixedly connected to the traction chains, the filter screen and the mesh plate are arranged on the filter frame; the cleaning brush is fixed inside the side plate of the frame, brush bristle of the cleaning brush is contacted with the filter screen. By adopting the rotary filter screen type bar screen cleaner, fine floater and suspending solid matters in sewage can be intercepted; and furthermore, cleaning efficiency is high.

The invention provides a modified starch composition used in the paper-making field. The modified starch composition comprises reaction products by mixing guar gum, an etherified modified compound of starch, a metal silicate and water, wherein the etherified modified compound of starch is an etherified modified compound of original starch and a cationic etherifying agent pre-activated by an alkaline catalyst, the mass of the cationic etherifying agent in the cationic etherifying agent pre-activated by the alkaline catalyst is 5%-15% of the total dry mass of the original starch and the guar gum, the mass of the alkaline catalyst is 1.0%-2.0% of the total dry mass of the original starch and the guar gum; the dry mass of the guar gum is 1.0%-3.0% of the dry mass of the original starch, and the dry mass of the metal silicate is 10%-30% of the total dry mass of the original starch and the guar gum. The invention also provides a preparation method of the modified starch composition and pulp using the modified starch composition. The modified starch composition can effectively improve the retention and drainage properties of the pulp.

The invention provides a method for reducing food packaging paper pulp molded product fiber dosage. The method for reducing the food packaging paper pulp molded product fiber dosage can be achieved through the following technical scheme: in the process of paper pulp molding forming, adding an environment-friendly food grade CaCo3 padding to replace partial plant fiber, and supplementing cationic polyacrylamide (CPAM) of eight million molecular weight to use as a retention auxiliary agent; forming large-size flocculation perssad and achieving modified effect by mix and flocculation effects of the CPAM, the fiber and the CaCO3 padding. The CaCo3 padding and the fine plant fiber have good absorption capacity, the surface of the CaCo3 padding can be better absorbed with the plant fiber, and therefore the purposes of improving fiber retention and reducing pulp product fiber dosage are achieved. The method for reducing the food packaging paper pulp molded product fiber dosage has the advantages of being environment-friendly and high-efficiency, simple and practical, and high in application value.

The invention discloses a method for restoring shriveled inscribed bamboo slips through swelling, and relates to a method for restoring cultural relics of the inscribed bamboo slips, in particular to components of a material for restoring low intensity inscribed bamboo slips and the shriveled inscribed bamboo slips which are obtained in archaeological excavation, and a method for preparing and restoring the same. The method comprises the following steps: (1) cleaning the shriveled inscribed bamboo slips by using distilled water; (2) soaking the cleaned shriveled inscribed bamboo slips in a bamboo swelling material for 3 to 7 days; (3) soaking the swollen shriveled inscribed bamboo slips in a bamboo restoring material for 7 to 10 days; and (4) placing the obtained bamboo slips at a cool and ventilated place to be dried naturally. The method obviously improves the intensity of the shriveled inscribed bamboo slips, strengthens the folding strength, the tearability, the bursting strength and the tensile strength, and improves the drainability. Besides, the method is suitable for restoring the shriveled inscribed bamboo slips through swelling.

The invention discloses cation polyacrylamide retention and drainage aids. The cation polyacrylamide retention and drainage aids are characterized in that cation polyacrylamide retention and drainage aids take a liquefied product for conducting acid catalytic liquefaction on bamboo wood in an alcohols solvent as a cation monomer, cation polyacrylamide is modified, and the cation polyacrylamide retention and drainage aids are obtained. The invention further discloses a preparation method of the cation polyacrylamide retention and drainage aids. According to the cation polyacrylamide retention and drainage aids and the preparation method thereof, the retention rate of paper pulp can be effectively increased, the smoothness, evenness and strength of the surface of the paper are improved, and meanwhile compared with a conventional polyacrylamide product, the biodegradability of cation modified polyacrylamide is greatly improved.

The invention belongs to the technical field of water conservancy projects, and particularly relates to a water gate garbage intercepting and cleaning device for a water conservancy project. The watergate garbage intercepting and cleaning device aims to solve the problem that an existing water gate garbage intercepting and cleaning device is manually cleaned, and manpower is wasted. According tothe scheme, the water gate garbage intercepting and cleaning device comprises a first supporting plate, wherein a first opening is formed in the outer wall of the top of one end of the first supporting plate, and a third filter screen plate is fixedly installed on the inner wall of the first opening; and a water guide opening is formed in the outer wall of the bottom of one end of the first supporting plate, an inclined opening plate is fixedly installed on the inner wall of the bottom of the water guide opening, and second supporting plates which are arranged at equal intervals are fixedly installed on the outer wall of the bottom of the other end of the first supporting plate. According to the water gate garbage intercepting and cleaning device for the water conservancy project, a vibration motor is arranged, the vibration motor can drive a fourth filter screen plate to vibrate, so that the water filtering effect is improved, the weight caused by water in the garbage recovery processis reduced, and the convenience of garbage recovery is improved.

The invention discloses a method for preparing an artificial wetland matrix material by using powdered waste red brick block, and belongs to the technical field of wastewater treatment. The invention mainly solves the problem of disposal of construction waste of waste red brick block; and the waste red brick block is subjected to crushing and grinding to obtain a powdered waste red brick block, which is prepared into an artificial wetland matrix material. The artificial wetland matrix material prepared by the invention has high specific surface area and porosity, is not easily blocked, and can filter and adsorb pollutants in water; and Al<3+>, Ca<2+>, Fe<3+>, Mg<2+> contained in the matrix material can generate a precipitation reaction with phosphorus in water, and are conducive to the removal of phosphorus in wastewater, and trace elements are conducive to the growth of wetland plants. Therefore, the artificial wetland matrix material prepared by the invention can changes the powdered waste redbrick block into treasure, and efficiently utilize resources.