6results about How to "Reduce pulping costs" patented technology

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 utility model discloses a system for automatically adjusting slurry concentration, which comprises a stirring barrel, an on-line concentration detection device mounted on the inner bottom surface of the stirring barrel, an overflow port arranged at the top end of the side wall of the stirring barrel, a filter plate fixedly connected in the overflow port, a filtrate storage box arranged on the outer side of the overflow port, and a filtrate pipeline communicated with the output end of the filtrate storage box, a water outlet of the filtrate pipeline is communicated with an inlet of the water tank, an outlet of the water tank is communicated with an inlet of the make-up pump, and a water make-up pipeline is communicated between an outlet of the make-up pump and an inlet of the input end of the filtrate storage box. The online concentration monitoring device has the advantages that when the slurry concentration deviates from a set value in the slurry conveying process, online concentration monitoring is achieved by arranging the online concentration detection device in the stirring barrel, water drainage or water supplement is achieved through the filtrate storage box on the side portion, real-time adjustment of the water-solid ratio in the stirring barrel is achieved, and the stirring efficiency is improved. The hysteresis of adjusting the water-solid ratio at the source is eliminated, the instability of the slurry concentration is effectively reduced, and the slurry preparation cost is reduced.

The utility model discloses a cotton stalk papermaking pulping system, relates to the technical field of pulping and papermaking, and mainly aims to degrade pectin in cotton stalks on the basis of reducing dependence on high-concentration alkali. The main technical scheme of the utility model is as follows: the cotton stalk papermaking pulping system comprises a material preparation part, an enzymolysis part and a cooking part, the material preparation part comprises a wet material preparation unit, a screw extruder and a double-screw thread rolling machine which are connected in sequence; the enzymolysis part comprises a hot spiral conveying mechanism, a mixed material lifting spiral conveying mechanism and an enzymolysis reaction bin which are connected in sequence, and the mixed material lifting spiral conveying mechanism is connected to an enzyme preparation blending tank; the cooking part comprises an aggregate spiral conveying mechanism, a bucket elevator, a feeding spiral conveying mechanism, a cooking pipe mechanism, a discharger and a spraying bin which are connected in sequence.

This invention provides a nickel-cobalt hydroxide slurry leaching apparatus and method. The nickel-cobalt hydroxide slurry leaching method includes: separately conveying nickel-cobalt hydroxide material and a mixed liquid to a slurry preparation tank for slurry preparation to obtain a homogenized slurry; subsequently, leaching the homogenized slurry to obtain a leachate, and recirculating a portion of the leachate back to the slurry preparation process; the slurry preparation includes sequential primary and secondary agitated slurry preparation, with the primary agitated slurry preparation rate being lower than the secondary agitated slurry preparation rate; the liquid-to-solid ratio in the slurry preparation tank is (1~1.5):1. This invention achieves high-speed, continuous slurry preparation by optimizing the slurry preparation process and process parameters, greatly improving the uniformity and stability of the slurry.

The invention discloses a method for improving the alkali impregnation yield of a fiber raw material, which comprises the following steps: screening the fiber raw material to obtain qualified wood chips, and before alkali impregnation, carrying out at least one dry heat treatment on the washed and dehydrated fiber raw material at 105-130 DEG C for 10-60 minutes. According to the method disclosed by the invention, under the condition of no chemical modification, only relatively mild heat treatment is used, and precursor micromolecules originally located in a cell cavity are stably connected with a main body structure of a fiber raw material as far as possible through free radical condensation, so that the alkali impregnation yield of pulping of the chemimechanical pulp is improved; and the pulping cost is saved while the subsequent paper pulp performance is ensured, and the emission of pollutants is reduced.

The invention belongs to the field of chemical mechanical pulping. The invention discloses a natural color chemical mechanical pulping process of camphor wood sodium hydroxide, comprising: S1, softening and extruding and tearing camphor wood chips, and then using water vapor to perform segmented distillation treatment, wherein the initial distillation temperature is lower than 120°C, so that the extraction rate of camphor oil is ≥96%; S2, steaming and extruding and tearing the camphor wood chips after the segmented distillation treatment, and then reacting with an alkaline liquid containing a wood chip penetrant; S3, grinding the reacted materials through a pressure mill, dehydrating, eliminating latent, screening and concentrating to obtain a natural color chemical mechanical pulp. According to the characteristics of camphor wood, such as greater density than poplar wood and difficulty in pulping, the invention can add a wood chip penetrant in a liquid impregnator to promote rapid and uniform penetration of the alkaline liquid, and good softening effect of the wood chips, so as to facilitate chemical treatment and grinding. The process of the invention has the characteristics of high camphor and camphor oil extraction rate, low pulping cost, and good pulp quality.