3 results about "Pulp industry" patented technology

The invention relates to the technical field of microwave absorbing materials, in particular to a preparation method of a paper pulp industry sludge-based composite wave absorbing material. The preparation method comprises the following steps: (1) pre-drying paper pulp industrial sludge, ball-milling, and sieving to obtain a sludge carrier; (2) taking a sludge carrier, adding acidizing fluid for activation, and drying for 6-12 hours at the temperature of 70-100 DEG C to obtain a dried product for later use; (3) dropwise adding the transition metal nitrate solution into the tannic acid solution, and adjusting the pH value through ammonia water until stable sol is formed; and (4) dipping the dried product in the step (2) into the sol in the step (3), and oscillating and loading for 12-24 hours in a phosphate buffer environment to obtain the product. According to the method, the pulp industrial sludge is recycled, meanwhile, the preparation is simple, the cost is low, and the prepared composite microwave absorbing material is unique in structure and excellent in performance.

The present application belongs to the technical field of lignin processing, and more particularly relates to a modified melamine functional additive of lignin depolymerization product and a preparation method thereof. A lignin depolymerization product with rich active functional groups such as phenolic hydroxyl groups, methoxyl groups and ester groups is obtained by depolymerizing lignin. The modified melamine functional additive of lignin depolymerization product is prepared by hydroxymethylation, sulfonation, acid polymerization, alkaline reforming and spray drying, and has good dispersing performance, compatibility and high water reducing rate. Therefore, the modified melamine functional additive of lignin depolymerization product has multiple functions such as water reducing, grinding aid, dispersing and reinforcing, and can be used as ceramic additives, soil conditioners, dye dispersants, concrete water reducing agents and coal water slurry dispersants, etc., showing strong market potential and environmental protection value. The present application uses lignin, a byproduct of pulp industry, as raw material, which is not only rich in resources and low in cost, but also promotes waste resource utilization and helps to achieve the goal of carbon peak and carbon neutralization.

The application discloses a kind of transverse tube continuous cooking energy-saving system and waste heat recovery method, the transverse tube continuous cooking energy-saving system of the present application includes preheating spiral, feeder, T-shaped pipe, cooking pipe, unloader, spray pipe, spray pot, black liquor tank, cooking medicine liquor tank, pressure-reducing unloading cyclone separator, flash vapor compression device, injection absorption heat pump and pressure cooking medicine liquor heating tank.The present application aims to solve the problems of high energy consumption, low waste heat utilization rate, low spray pulp concentration and low flash vapor heat energy grade in traditional transverse tube continuous cooking process;reduce factory area white mist thermal pollution, without changing the quality of fiber and finished pulp, can be low-cost reformed in existing production line, with short payback period, suitable for reed, wheat straw, bagasse, bamboo pulp and eucalyptus broad-leaved wood pulp transverse tube cooking process, in line with the green and low-carbon development requirements of pulp industry.