6 results about "Green liquor" patented technology

The invention discloses a method for preparing high-quality light calcium carbonate based on green liquid separation and impurity removal-crystal nucleus induction causticization granulation, and relates to the technical field of pulping and papermaking waste liquid treatment. According to the method, pulping black liquor is used as a raw material, calcium silicate is separated through fractional precipitation, granular calcium carbonate crystals are generated through crystal nucleus induction causticization reaction, and high-quality light calcium carbonate is prepared through multi-stage purification. The content of calcium carbonate prepared by the method can reach 98-99.5% of the purity of industrial calcium carbonate, the purity of calcium silicate byproducts is greater than or equal to 90%, the calcium silicate byproducts can be directly used for roadbed materials or cement retarders, the recovery rate of sodium hydroxide in the black liquor is greater than or equal to 92%, and resource utilization is realized.

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.

The application discloses a method for improving the stability of bamboo green liquor, and belongs to the technical field of liquor brewing. The method for improving the stability of bamboo green liquor comprises adsorption treatment, i.e. using chelating resin to adsorb the bamboo green liquor. According to the method for improving the stability of bamboo green liquor provided in the application, the bamboo green liquor with complex components can still maintain good color and luster after being stored for a certain period of time, and has high color and luster stability.

The present invention relates to a mixing assembly for controlling the mixing of green liquor and a flocculant. This assembly comprises a mixing vessel (20) with a first end and a second end, an inlet (21) for supplying liquor and flocculant to the mixing vessel near the first end, an outlet (22), and a rotatable stirring device (31) near the first end for mixing the liquor and flocculant by agitation. The mixing vessel (20) has a length from the center of the inlet to the center of the outlet, and a maximum width perpendicular to this length, which is at least 1.5 times the maximum width. The invention also relates to a method for controlling the flocculation of the green liquor.

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.

This utility model relates to the field of feeding technology for causticizing lime digestion and slag removal machines in papermaking alkali recovery, specifically a cyclone feeder for a lime digestion and slag removal machine. The feeder includes a cylinder body positioned between the lime digestion and slag removal machine and the lime feeding assembly. A green liquor inlet is also provided on the cylinder body. The cylinder body comprises an upper cylinder and a lower cylinder body. The lower cylinder body includes an inverted conical cylinder and an upright conical cylinder. The connection between the inverted and upright conical cylinders forms a neck. The bottom end of the upright conical cylinder is below the liquid surface in the lime digestion and slag removal machine. This cyclone feeder for a lime digestion and slag removal machine ensures thorough mixing of quicklime and green liquor while solving the problem of lime dust pollution. It reduces the processing load on the scrubber and decreases the formation of sludge within the scrubber. The structure is simple, with no maintenance or operating parts, resulting in low manufacturing costs. It is applicable to feeding lime digestion and slag removal machines in the causticizing section of alkali recovery in the papermaking industry and can also be used in similar solid-liquid mixing scenarios in other industries.