6 results about "Kaolin product" patented technology

The invention discloses a method for preparing coal and calcined kaolin through coal gangue grinding and grading-acid leaching-suspension calcination, and belongs to the technical field of coal gangue beneficiation. According to the method disclosed by the invention, the three stages of ore grinding flotation, acid leaching purification and fine grinding calcination complement each other, so that fine-grained calcined kaolin of which the content of-7 microns is greater than or equal to 90% and the whiteness is greater than or equal to 90% and ultrafine-grained calcined kaolin of which the content of-2 microns is greater than or equal to 90% and the whiteness is greater than or equal to 90% are prepared. According to the method, effective separation of coarse coal, leaching and purification of impurity iron elements and calcination and purification of fine-grained kaolin are realized through step grinding and step separation; the gas-solid reaction degree is improved and sintering is avoided by utilizing the dispersion and suspension characteristics of fine-particle materials; the dehydroxylation and decarburization reactions can be carried out completely by calcining fine materials and precisely controlling the temperature, so that the whiteness of the calcined kaolin product is remarkably improved. According to the method, the adaptability to coal gangue raw ore is improved, and meanwhile, a new thought is provided for efficiently preparing a calcined kaolin product from the coal gangue and cooperatively recycling coal resources.

The invention provides a recovery method and a recovery device for rare earth and porcelain clay in porcelain clay raw ore, and relates to the technical field of comprehensive utilization of porcelain clay raw ore, the recovery device comprises: a plate-and-frame filter press for pressing porcelain clay raw ore pulp into a filter cake, and leaching the filter cake into a rare earth-containing leaching solution under the action of a purifying agent, washing the residual salt-containing filter cake, and discharging to obtain a porcelain clay product; and the sedimentation tank is used for collecting the rare earth-containing immersion liquid and carrying out sedimentation treatment on the rare earth-containing immersion liquid to obtain rare earth concentrate. According to the method, the plate-and-frame filter press is used for leaching the rare earth, the porcelain clay product is obtained, the recycling method has the advantage that the using amount of the purifying agent is small, the ion phase rare earth in the porcelain clay raw ore can be efficiently and rapidly removed, and the method has a good large-scale application prospect.

The invention provides a system and a method for producing high-whiteness kaolin by high-pressure multi-stage calcination of coal gangue, and relates to the technical field of kaolin calcination. The system comprises a high-pressure furnace tube, a high-pressure feeding bin, a kiln head sealing assembly, a kiln tail sealing assembly, a high-pressure rotary sealing head, an electromagnetic induction heating coil, a supporting frame, a driving assembly, a high-pressure oxidizing gas pipeline, a high-pressure reducing gas pipeline and the like. The method has the beneficial effects that a high-pressure multi-stage calcination technology is adopted, the oxidation of refractory substances such as fixed carbon in the coal gangue is accelerated by utilizing a high-pressure oxygen-enriched condition, calcination and decarburization of the coal gangue can be realized under the conditions of lower temperature and shorter time, the energy consumption of the calcination process is greatly reduced, and the production cost of a product is reduced; the special functions of low-temperature rapid combustion of fixed carbon, rapid oxidation of impurity minerals, rapid passivation and decoloration of color development impurities and the like can be realized in the calcining process through multi-parameter control, and indexes such as whiteness, activity and specific surface area of a calcined kaolin product can be greatly improved.

The invention relates to the field of mineral products, in particular to a kaolin deironing and whitening method which comprises the following steps: step 1, pulping: adding water into powdery or muddy kaolin, and stirring to obtain kaolin slurry and form uniform suspension, so as to facilitate subsequent grading and magnetic separation and facilitate impurity separation; step 2, magnetic separation: carrying out magnetic separation on the kaolin slurry to separate out ferromagnetic substances in the kaolin slurry, and removing mechanical iron and part of iron-containing minerals in the process to improve the whiteness of the kaolin; step 3, electrolytic oxidation: oxidizing Fe < 2 + > insoluble in water in the kaolin into Fe < + > by using an electrolysis device; step 4, electrolytic iron removal: reducing water-insoluble Fe < + > in the kaolin slurry into water-soluble Fe < + > by using an electrolysis device; and step 5, dehydrating, and separating out water in the kaolin slurry to obtain the kaolin. According to the kaolin deironing and whitening method, Fe < + > in kaolin can be effectively removed, the whiteness of a product is remarkably improved, and meanwhile the problems that a kaolin product becomes yellow or red and is low in whiteness are solved.

The invention relates to the technical field of kaolin modification, in particular to modified kaolin with high viscosity concentration and a preparation method and application thereof. The preparation method of the modified kaolin with high viscosity concentration comprises the following steps: mixing kaolin and sulfamide, ball-milling, drying and modifying to obtain the modified kaolin. The invention provides a process for modifying the kaolin by combining dry ball milling and dry modification technologies and using sulfamide, so that the viscosity concentration of the kaolin can be improved, the structure of the kaolin is not changed, the original whiteness of the kaolin is maintained, the viscosity of a kaolin product is effectively reduced, and the comprehensive quality of the kaolin product is improved; and subsequent papermaking coating and other process applications are not influenced, so that the requirements of the papermaking industry are better met.