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CN-122010121-A - Preparation method and application of white carbon black with low water content

CN122010121ACN 122010121 ACN122010121 ACN 122010121ACN-122010121-A

Abstract

The invention provides a preparation method of white carbon black with low water content and application thereof, relating to the technical field of white carbon black preparation, wherein the method comprises the steps of filtering sodium silicate solution generated by desilication of fly ash or coal gangue to form desilication liquid; adding polyethylene glycol and an auxiliary agent A into desilication liquid, introducing carbon dioxide into sodium silicate solution at 70 ℃ and 0.2MPa for carbon separation, aging, and washing slurry to neutrality by filter pressing, clear water and acid liquor, wherein the water content of the obtained filter cake is only 50%. The white carbon black is obtained by spray drying, the bulk density of the white carbon black is about 0.3-0.4g/cm 3 , and compared with the traditional precipitation method white carbon black, the white carbon black prepared by the method can greatly reduce the drying and transportation cost. The filtrate produced by the method can be causticized to recycle NaOH and calcium carbonate, so that the recycling of resources is realized. The white carbon black has high reinforcing property, low heat generation and excellent wear resistance in car tires, engineering machinery tires and conveyor belt covering rubber, and is suitable for high-performance rubber products.

Inventors

  • GAO PEIJUN
  • YE WENSHENG
  • ZHANG ZHANJUN
  • ZHAO FAN
  • DOU WEIBO

Assignees

  • 鄂尔多斯市蒙泰铝业有限责任公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (9)

  1. 1. The preparation method of the white carbon black with low water content is characterized by comprising the following steps: S1, preparing a sodium silicate solution, namely filtering the sodium silicate solution generated by desilication of fly ash or coal gangue; S2, carbon component reaction, namely adding polyethylene glycol and an auxiliary agent A into a sodium silicate solution, introducing carbon dioxide gas, stirring, stopping ventilation when the pH value is 9-10, starting aging treatment, wherein the preparation raw materials of the auxiliary agent A comprise 55-60 parts of gamma-aminopropyl triethoxysilane, 28-30 parts of polyether modified silicone oil, 8-10 parts of tertiary butanol and 16-20 parts of deionized water in parts by weight, stirring 55-60 parts of gamma-aminopropyl triethoxysilane and 16-20 parts of deionized water for 30 minutes at a stirring rate of 400rpm at 45-50 ℃, adding 28-30 parts of polyether modified silicone oil and 8-10 parts of tertiary butanol, shearing and emulsifying for 1 hour at a high speed of 500rpm under the protection of nitrogen at 60-65 ℃, and standing and curing for 1.5-2 hours at 40 ℃ to obtain the auxiliary agent A; S3, post-treatment, namely performing liquid-solid separation on the aged slurry through a plate-and-frame filter press, washing a filter cake, and drying the filter cake in a spray drying tower to obtain the white carbon black with low water content and high bulk density; s4, recycling byproducts, namely mixing filtrate generated by the carbon component reaction with calcium hydroxide for reaction, and filtering to obtain NaOH solution and calcium carbonate precipitate.
  2. 2. The method of claim 1, further comprising reacting the carbon dioxide to produce a filtrate comprising sodium carbonate and sodium bicarbonate.
  3. 3. The preparation method according to claim 1, wherein the filtrate produced by the carbon content reaction is mixed with calcium hydroxide in a mass ratio of 1:0.6-1, causticized at 80+ -5 ℃ for 0.8-1.2 hours, and filtered to obtain NaOH solution and calcium carbonate precipitate.
  4. 4. The preparation method according to claim 1, wherein 90-100 parts by weight of fly ash or coal gangue and 300-500 parts by weight of sodium hydroxide are reacted at 90 ℃ for 3-7 hours and filtered to obtain a sodium silicate solution.
  5. 5. The method according to claim 1, wherein the sodium silicate solution is adjusted to a silica concentration of 100 to 120g/L with sodium hydroxide, silica fume or water glass before introducing the sodium silicate solution into the carbon dioxide gas, and the modulus is 1.8 to 2.2.
  6. 6. The preparation method according to claim 1, wherein 480 to 500 parts by weight of sodium silicate solution is added into a stirred reaction kettle, then 0.8 to 1.5 parts by weight of polyethylene glycol is added, the temperature is raised to 70 ℃, carbon dioxide gas is introduced at a rate of 0.5L/min, the pressure is 0.2MPa, the stirring speed is 200rpm, the aeration is stopped when the pH value of the slurry is 9.5, and then the slurry is aged for 0.5 to 3 hours by standing.
  7. 7. The preparation method of claim 1, wherein the aged slurry is subjected to liquid-solid separation by a plate-and-frame filter press under the pressure of 0.6MPa, the filter cake is washed 3 times by clean water, the water consumption is 1 time of the volume of the filter cake, then the filter cake is washed by 5% hydrochloric acid until the pH value is 7.0, the filter cake is washed 1 time by clean water, the water content of the filter cake after the filter pressing is 50% -60%, the washed filter cake is placed in a spray drying tower, and the filter cake is dried under 400 ℃ hot air until the water content is 3.9-4.2%, so that the white carbon black with low water content and high bulk density is obtained.
  8. 8. The application of the white carbon black prepared by the preparation method of the low-water-content white carbon black according to any one of claims 1 to 7 is characterized in that the white carbon black is applied to tread rubber of a car tire, and specifically comprises the steps of plasticating styrene-butadiene rubber and butadiene rubber, adding the white carbon black with low water content and high bulk density, zinc oxide, stearic acid, an anti-aging agent 4020 and microcrystalline wax for mixing, adding a coupling agent Si-69 with the mass percent based on the white carbon black for mixing and discharging rubber, thinning, adding an accelerator CBS and sulfur, and blanking to prepare final rubber.
  9. 9. The application of the low-water-content high-bulk-density white carbon black prepared by the preparation method of the low-water-content white carbon black according to any one of claims 1 to 7 is characterized in that the application is applied to a base rubber of a tire tread of an engineering machine, and specifically comprises the steps of banburying natural rubber with butadiene rubber, adding the low-water-content high-bulk-density white carbon black, carbon black N330, aromatic hydrocarbon oil, zinc oxide, stearic acid, an anti-aging agent RD and an anti-aging agent 4010NA, mixing, adding a coupling agent Si-75 mixing rubber based on the mass of the white carbon black, adding an accelerator NOBS and sulfur, preparing a rubber compound from a lower piece, vulcanizing to obtain the base rubber of the tire tread of the engineering machine, and the application of the low-water-content high-bulk-density white carbon black in a green high-filling conveyor belt covering rubber, mixing ethylene propylene diene rubber, adding the low-propylene-diene monomer rubber with the high-bulk-density white carbon black, the paraffin oil, the zinc oxide, the stearic acid and the anti-aging agent MB in batches, controlling the rubber discharging temperature, adding a peroxide DCP and an auxiliary crosslinking agent TAIC, preparing rubber compound from a lower piece, vulcanizing to obtain a conveyor belt covering rubber.

Description

Preparation method and application of white carbon black with low water content Technical Field The invention relates to the technical field of building materials, in particular to a preparation method and application of white carbon black with low water content and high bulk density. Background White carbon black is used as an important reinforcing filler in the rubber industry and is widely applied to energy-saving tires and engineering products, however, the traditional precipitation method white carbon black is mainly produced by adopting a reaction process of sodium silicate and sulfuric acid, and the problems of huge water washing amount, high drying energy consumption, high packaging and transportation cost and the like exist although the technology is mature. For example, the water content of the white carbon black by the traditional precipitation method is often up to 75-80%, so that in order to enable the soluble salt in the product to meet the technical requirements of downstream customers, repeated washing is often required to be carried out by consuming clean water with the volume which is several times that of a filter cake, and the washing water amount per ton of white carbon black is usually up to 15-20 tons, which not only causes water resource waste, but also generates a large amount of wastewater to be treated. For white carbon black with the water content of 75-80%, the natural gas consumption for drying one ton of products is up to 200 cubic meters, and the drying cost of only one of the white carbon black is up to about 600 yuan. In addition, the bulk density of the white carbon black in the traditional precipitation method is generally lower than 0.25 g/cm 3, so that the packaging and transportation cost of the white carbon black is high. In summary, although the traditional precipitation method white carbon black is a product with the largest yield, the widest application and the lowest production cost in white carbon black products, the production cost still remains high due to the limited physicochemical characteristics and the high water content of the filter cake and the low density of the product. Therefore, development of a novel white carbon black with low water content and high bulk density is needed. Disclosure of Invention The invention aims to provide a preparation method and application of white carbon black with low water content and high bulk density, which are used for solving the problems of high water content, low bulk density, difficult filtration and washing, high energy consumption and water consumption and the like caused by colloidal substances in the production process of white carbon black products in the prior art, and the problems cause high production cost, low efficiency and high environmental protection pressure of the white carbon black and restrict the technical bottleneck of the application of the white carbon black in high-end rubber products. The specific technical scheme of the invention is as follows: The invention provides a preparation method of white carbon black with low water content and high bulk density, which comprises the following steps: S1, preparing a sodium silicate solution, namely filtering the sodium silicate solution generated by desilication of fly ash or coal gangue; S2, carbon component reaction, namely adding polyethylene glycol and an auxiliary agent A into a sodium silicate solution, introducing carbon dioxide gas, stirring, stopping ventilation when the pH value is 9-10, adding a dispersing agent, and aging to obtain aged slurry; s3, post-treatment, namely carrying out liquid-solid separation on the aged slurry through a plate-and-frame filter press, washing a filter cake, and drying the filter cake in a spray drying tower to obtain the white carbon black with low water content and high bulk density. And S4, recycling byproducts, namely mixing filtrate generated in the carbon component reaction with calcium hydroxide for reaction, and filtering to obtain NaOH solution and calcium carbonate precipitate. Further, the filtrate generated by the carbon reaction contains sodium carbonate and sodium bicarbonate, the filtrate generated by the carbon reaction is mixed with calcium hydroxide according to the mass ratio of 1:0.6-1, the causticization reaction is carried out for 0.8-1.2 hours at 80+/-5 ℃, and NaOH solution and calcium carbonate sediment are obtained by filtration. Further, 90-100 parts of fly ash or coal gangue and 300-500 parts of sodium hydroxide are reacted for 3-7 hours at 90 ℃ according to parts by weight, and sodium silicate solution is obtained after filtration. Further, sodium hydroxide, active silicon powder and water glass are used for adjusting the silicate solution until the concentration of silicon dioxide is 100-120g/L and the modulus is 1.8-2.2 before introducing carbon dioxide gas into the sodium silicate solution. Further, adding 480-500 parts by weight of sodium silicate solution into a reaction kettle