Search

CN-122010432-A - Coal saving agent for cement kiln by utilizing waste solid and waste liquid, and preparation method and application thereof

CN122010432ACN 122010432 ACN122010432 ACN 122010432ACN-122010432-A

Abstract

The invention belongs to the technical field of waste resource utilization and coal saving agents, and discloses a coal saving agent for a cement kiln, which utilizes waste solid and waste liquid, and a preparation method and application thereof. The invention discloses a coal saving agent for a cement kiln, which utilizes waste solid and waste liquid and comprises the following raw materials, by mass, 50% -60% of ferrite-containing waste liquid, 10% -20% of red mud, 5% -10% of grinding aid dispersing agent, 1% -3% of sulfur fixing agent and the balance of water. The invention takes the ferrite-containing waste liquid and the red mud as main raw materials, and combines the grinding aid dispersing agent and the sulfur fixing agent to improve the combustion efficiency of the coal under the combined action, thereby not only having no adverse effect on the production process of cement and the performance thereof, but also realizing the harmless treatment and the recycling of the waste solid and waste liquid.

Inventors

  • LI YEQING
  • Peng Chengkangyan
  • LIU SHUCHENG
  • YU SONGBAI

Assignees

  • 华新建材集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260213

Claims (10)

  1. 1. A coal saving agent for a cement kiln by utilizing waste solid and waste liquid is characterized by comprising the following raw materials, by mass, 40% -60% of ferrite-containing waste liquid, 10% -20% of red mud, 5% -10% of grinding aid dispersing agent, 1% -3% of sulfur fixing agent and the balance of water, wherein the grinding aid dispersing agent is silicon dioxide modified by triethanolamine and sucrose fatty acid ester, and the sulfur fixing agent is a mixture of nano titanium dioxide, calcium carbonate and cerium oxide.
  2. 2. The coal saving agent for the cement kiln, which is prepared from the following raw materials, by mass, 50% -60% of waste ferrite liquid, 15% -20% of red mud, 5% -8% of grinding aid dispersing agent, 1% -2% of sulfur fixing agent and the balance of water.
  3. 3. The coal saving agent for cement kiln using waste solid and liquid as claimed in claim 1, wherein the preparation method of the grinding aid dispersant comprises the steps of uniformly dispersing silicon dioxide in water, adding triethanolamine, performing primary reaction under stirring and heating conditions, adding sucrose fatty acid ester, and performing secondary reaction under stirring and heating conditions to obtain the grinding aid dispersant.
  4. 4. The coal-saving agent for cement kiln using waste solid and liquid according to claim 3, wherein the particle diameter of the silica is less than 10. Mu.m, the volume ratio of the silica to water is 1g (30-70 mL), the mass ratio of the triethanolamine to the silica is (5-10): 1, and the mass ratio of the sucrose fatty acid ester to the silica is (5-10): 1.
  5. 5. The coal saving agent for cement kiln using waste solid and liquid according to claim 3, wherein the reaction temperature of the primary reaction is 50-70 ℃, the reaction time is 30-60 min, the reaction temperature of the secondary reaction is 60-80 ℃ and the reaction time is 1-2 h.
  6. 6. The coal saving agent for cement kilns using waste solids and liquid according to claim 1, wherein the mass ratio of the nano titanium dioxide to the calcium carbonate to the cerium oxide is (1-2): (0.5-1): 1, the particle size of the nano titanium dioxide is 60-80 nm, the particle size of the calcium carbonate is less than 10 μm, and the particle size of the cerium oxide is less than 10 μm.
  7. 7. The coal saving agent for cement kiln using waste solid and liquid according to claim 1, wherein the pH of the ferrite-containing liquid waste is not more than 1, the concentration of iron ions is 20% -30%, and the concentration of sulfate ions is 20% -30%.
  8. 8. The coal-saving agent for cement kiln using waste solid and liquid according to claim 1, wherein the red mud is bayer process red mud, the particle size is less than 1mm, the pH is 10-12, the water content is less than or equal to 8%, the content of Fe 2 O 3 is 40% -60%, the content of Al 2 O 3 is 10% -20%, and the content of CaO is 1% -10%.
  9. 9. The method for preparing the coal-saving agent for the cement kiln by utilizing the waste solid and liquid waste according to any one of claims 1-8, which is characterized by comprising the steps of adding a grinding aid dispersing agent, a sulfur fixing agent and water into the waste liquid containing ferrite, uniformly stirring, and then adding red mud, and uniformly stirring, wherein the obtained suspension is the coal-saving agent for the cement kiln.
  10. 10. The use of the coal-saving agent for cement kilns using waste solid and liquid according to any one of claims 1 to 8, wherein the coal-saving agent for cement kilns is sprayed on coal before grinding the coal, and the spraying amount is 0.08% -0.1% of the mass of the coal.

Description

Coal saving agent for cement kiln by utilizing waste solid and waste liquid, and preparation method and application thereof Technical Field The invention belongs to the technical field of waste resource utilization and coal saving agents, and particularly relates to a coal saving agent for a cement kiln, which utilizes waste solid and waste liquid, and a preparation method and application thereof. Background The coal is used as a core fuel in the cement clinker production process, the combustion performance of the coal directly relates to the production efficiency, the operation cost and even the core economic benefit of cement enterprises, and the coal is one of key factors influencing the stability and the economy of the whole cement production process. In the cement clinker firing step, the heat energy released by coal combustion provides necessary conditions for clinker firing, and the combustion efficiency directly determines the production energy consumption level, thereby having an important influence on the market competitiveness of enterprises. However, as global industrialization progresses, the consumption of coal resources continues to rise, and coal is taken as a non-renewable resource, so that the reserves of the coal are continuously reduced due to long-term large-scale exploitation, and the situation that the coal supply is increasingly tense in the global scope is formed. The current situation not only promotes the purchase cost of coal, but also brings serious raw material supply pressure and operation challenges to the cement industry highly depending on coal. The cement industry is taken as the traditional high-energy-consumption industry, the demand on coal is huge, the coal consumption cost occupies higher specific gravity in the total cement production cost, and the energy conservation and consumption reduction become the core appeal of sustainable development of the industry. Under the background, the method improves the combustion efficiency of coal and reduces the consumption of coal by technical means, thereby becoming an important path for cement enterprises to reduce cost and increase efficiency and relieve resource pressure, and the research and the application of the coal-saving agent are key break-through for realizing the aim, and have important practical significance and strategic value for promoting the green low-carbon transformation of the cement industry and the sustainable development of the propelling industry. The existing coal-saving agent products in the market are mostly developed and designed aiming at industrial combustion scenes such as boilers and the like, and are difficult to fully meet the requirements of cement production. Meanwhile, the resource utilization requirements of industrial solid waste and waste liquid are increasingly urgent. The aluminum smelting solid waste, namely red mud, is the strong alkaline solid waste residue discharged from the process of extracting aluminum oxide by smelting bauxite, and the combined chemical alkali is difficult to remove and has large content, so that the harmless utilization of the red mud is difficult to carry out. With the development of the aluminum industry, the amount of red mud discharged in alumina production is increased increasingly, and the utilization of the red mud to the maximum extent is unprecedented. In addition, a large amount of waste liquid can be generated in the sludge treatment process of the sludge water plant, acid and transition metal salt are added in the treatment process to settle harmful heavy metal elements in the sludge and the sewage, so that the sludge water plant contains high-content acidic substances and transition metal ions, if the waste liquid is directly discharged, ecological environments such as water, soil and the like can be polluted, and the harmless treatment and recycling are also important problems facing the industry. Therefore, the development of the coal-saving agent for the cement kiln by utilizing the waste solid and waste liquid can not only meet the energy-saving requirement of the current cement industry, but also solve the treatment difficulty of two types of wastes, and accords with the concept of green development. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a coal-saving agent for a cement kiln, a preparation method and application thereof, which uses waste liquid containing ferrite and red mud as main raw materials, and is matched with a grinding aid dispersing agent and a sulfur fixing agent to jointly act to improve the combustion efficiency of coal, thereby not only having no adverse effect on the cement production process and performance, but also realizing harmless treatment and recycling of the waste liquid. The invention provides a coal saving agent for a cement kiln, which is prepared from 40-60% of ferrite-containing waste liquid, 10-20% of red mud, 5-10% of grinding aid dispersing agent, 1-3% o