12 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 discloses a system and a method for preparing kaolin by calcining and whitening coal gangue, the system comprises a preheater, a calcining furnace, a heat preservation bin and a cyclone cooling unit which are communicated in sequence, a blanking pipe of a penultimate cyclone separator of the preheater is connected with the calcining furnace, a combustor is arranged on the calcining furnace, and the cyclone cooling unit is connected with the calcining furnace. A discharging pipe of the cyclone separator at the bottom end of the preheater is connected with the calcining furnace and the heat preservation bin respectively; the cyclone cooling unit comprises a first cooling unit and a second cooling unit; a discharging port of the heat preservation bin is connected with a feeding port of the first cooling unit, and a discharging port of the first cooling unit is connected with a feeding port of the second cooling unit. The decarburization time is prolonged by adopting calcining furnace material circulation and a heat preservation bin, so that carbon in the coal gangue is completely removed, the whiteness of the kaolin product is further improved, the production line is energy-saving and emission-reducing, the product quality is stable, the process flow and equipment are simple, carbon emission reduction is realized, the production line is suitable for large-scale industrial production, the cost is reduced, and the cost performance is high.

The invention provides a comprehensive utilization method of sandstone aggregate waste powder, belongs to the technical field of processing and purification of non-metal ores, and solves the defect that the sandstone aggregate waste powder cannot be economically and environmentally friendly used for preparing various non-metal ore products in the prior art. The method comprises the steps that S1, sandstone aggregate waste powder is scrubbed and graded, and coarse sand and fine sand are obtained; s2, performing medium magnetic pre-selection on the fine sand to obtain pre-selected fine sand and a cement raw material; s3, the pre-selected fine sand is subjected to strong magnetic separation, and separated fine sand and cement raw materials are obtained; s4, grading the sorted fine sand to obtain primary kaolin and feldspar products; and S5, performing high-gradient strong magnetic separation on the primary kaolin to obtain a kaolin product and a cement raw material. The comprehensive utilization method of the sandstone aggregate waste powder provided by the invention has the advantage that the sandstone aggregate waste powder can be utilized economically and environmentally to prepare various non-metal mineral products.

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 relates to an improved production method of calcined kaolin, in particular to extraction of kaolin from coal gangue and optimization of the production process so as to improve the solubility of a final product and reduce the viscosity of the final product. The method mainly comprises the steps of raw material pretreatment, dry grinding and nanoscale crushing, wet grinding and special additive application, optimized calcination process and product inspection and packaging. In the raw material pretreatment stage, coal gangue kaolin is firstly subjected to water washing and high-gradient magnetic separation so as to remove impurities and iron substances; then, the raw materials are crushed to be uniform in size, and preparation is made for the subsequent grinding process. In the dry-method grinding stage, a jet mill dry-method grinding technology is adopted, and nano-scale crushing is combined, so that finer powder is obtained. In addition, a surfactant and a dispersing agent are added in the wet grinding process, so that the wettability and dispersity of the kaolin are improved. The calcining process is optimized, and a segmented temperature control technology is adopted, so that the physical and chemical characteristics of kaolin are improved. Through a series of process optimization, the kaolin product disclosed by the invention is remarkably improved in solubility and viscosity, so that the kaolin product is more suitable for industries such as papermaking, coating and the like. In addition, the implementation of the method helps to improve energy utilization efficiency and environmental friendliness.

The present invention discloses a method for the comprehensive utilization of weathered complex kaolin. The method performs multi-gradient particle size classification on the weathered complex kaolin ore based on the order of quartz mineral particle size > feldspar mineral particle size > mica mineral particle size > kaolin particle size. The ore of different particle sizes is then subjected to magnetic separation, flotation, reverse flotation, and other methods to ultimately produce feldspar, quartz, mica, and kaolin products. The tailings produced in this process can meet the manufacturing requirements for silicate-based building materials. This method achieves the comprehensive utilization of multiple products from weathered complex kaolin.

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 closed water-cooling waste heat recovery device is characterized in that a water-cooling sleeve is sleeved on the outer side of a machine body of a secondary wall cooler, annular plates are respectively fixed on two sides of the water-cooling sleeve, a plurality of water inlets are formed in the top of the water-cooling sleeve, and a plurality of water outlets are formed in the bottom of the water-cooling sleeve; a water source is communicated with the water inlet through a pipeline, and a heat preservation water storage pool is arranged underground below the second-stage wall cooling machine; the water outlet is communicated with the water inlet of the heat preservation reservoir through a pipeline, and the water outlet of the heat preservation reservoir is respectively communicated with a heating user and a domestic water user through pipelines. The utility model has the advantages that the connecting structure is simple and easy to realize, the temperature of a kaolin finished product cooled by the two-stage wall cooler is reduced to normal temperature, and a subsequent conveying system adopts a conventional screw conveyer, a bucket elevator and other low-temperature conveying systems, so that the energy consumption is reduced, the heat energy recovery is realized, and the production cost is reduced. And the living cost of an enterprise is saved.

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.

The invention discloses a treatment method for improving viscosity concentration of kaolin by shearing and extruding, which comprises the following steps: mixing a kaolin raw material with water to prepare a kaolin mud cake; adjusting the wheel spacing of the shearing and extruding equipment to be 1-5mm; adding the kaolin mud cake into shearing and extruding equipment for shearing and extruding treatment; pulping the kaolin mud subjected to shearing and extruding treatment again; and carrying out spray drying or flash drying on the slurried kaolin to obtain a high-viscosity concentration kaolin product. According to the method, the laminated kaolin sheet structure is stripped by adopting a physical method, the ordered arrangement of the kaolinite structure is promoted, sharp edges and corners between the kaolinite sheet corners are slowed down, and since no chemical agent is added, the viscosity concentration of the kaolin can be improved, and subsequent pollution to the kaolin is avoided, so that the viscosity concentration of the kaolin is improved.