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CN-122006892-A - Lump ore series-parallel screening process based on economic material condition

CN122006892ACN 122006892 ACN122006892 ACN 122006892ACN-122006892-A

Abstract

The invention relates to a lump ore series-parallel screening process based on an economic material condition, which comprises the following steps of firstly carrying out preliminary judgment on the powder content and the water content of the material, and secondly carrying out matching of a first process, a second process or a third process according to the preliminary judgment condition. In the step 1, the first process is selected for the screening operation of the economic material lump ore with high powder content, high water content and difficult screening, and the second process or the third process is selected for the screening operation of the lump ore with low powder content, low water content and easy screening. According to the scheme, under the condition that the original large sieving process structure is not changed, the material flow switching facility is additionally arranged, according to different economic material varieties, two vibrating screens can be connected in series to ensure that the powder content of the lump ore is qualified, and two sets of sieving systems are connected in parallel to ensure the production reliability, so that the comprehensive balance problem of the effect and the economical efficiency of lump ore treatment is skillfully solved.

Inventors

  • SUN JIANFU
  • WANG ZHENGQIANG
  • ZHANG DONG

Assignees

  • 南京宝地梅山产城发展有限公司
  • 上海梅山钢铁股份有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (5)

  1. 1. The block ore series-parallel screening process based on the condition of economic materials is characterized by comprising the following steps of: step 1, primarily judging the powder content and the water content of the materials; And 2, matching the first flow, the second flow or the third flow according to the preliminary judgment condition.
  2. 2. The process for screening lump ores in series and parallel based on economic materials as set forth in claim 1, wherein the process comprises the following steps of, In the step (1) of the process, Selecting a first process for sieving operation of economic material lump ores with high powder content and high water content and difficult sieving; aiming at the block ore screening operation with low powder content, low water content and easy screening, the second or third process is selected.
  3. 3. The process for screening lump ores in series and parallel based on economic materials as set forth in claim 1, wherein the process comprises the following steps of, In the step 2 of the process, the process is carried out, The first process is as follows: When the economic material lump ore screening operation with high powder content and high water content and difficult screening is carried out, the 1# adhesive tape conveyor below the raw ore buffer bin outputs lump ore to be screened, the lump ore enters the first a lump ore vibrating screen through the first three-way distributor and the 3# adhesive tape conveyor, the oversize material (with the particle diameter of more than 6mm lump ore) lump ore enters the mixing and proportioning ore tank through the adhesive tape conveyor, the 5# adhesive tape conveyor and the 6# adhesive tape conveyor, the lump ore is transferred to the second three-way distributor and is switched to the second b lump ore vibrating screen for carrying out the re-screening process, the oversize material is buffered by the 9# adhesive tape conveyor to remove the lump ore finished product bin, the blast furnace is used, the undersize material (with the particle diameter of less than 6mm lump ore) of the lump ore vibrating screen a enters the mixing and proportioning ore tank through the adhesive tape conveyor, the undersize material (with the particle diameter of less than 6mm lump ore) of the lump ore vibrating screen b enters the mixing and proportioning ore tank through the adhesive tape conveyor, and the working cycle of the economic material serial screening is formed, and the economic lump ore variety with the corresponding screening difficulty is effectively reduced, and the powder content (% of lump ore after screening is reduced.
  4. 4. The process for screening lump ores in series and parallel based on economic materials as set forth in claim 1, wherein the process comprises the following steps of, The second process is as follows: When the bulk ore screening operation with low powder content, low water content and easy screening is carried out, the 1# adhesive tape conveyor below the raw ore buffer bin outputs bulk ore to be screened, the bulk ore enters the a bulk ore vibrating screen through the first three-way distributor and the 3# adhesive tape conveyor, the oversize (with the particle size of more than 6 mm) bulk ore is transported to the second three-way distributor through the adhesive tape conveyor, the 12# adhesive tape conveyor and the 6# adhesive tape conveyor, is switched to the 8# adhesive tape conveyor and the 9# adhesive tape conveyor for removing bulk ore finished product buffer bin, the bulk ore vibrating screen is used by a blast furnace, the undersize (with the particle size of less than 6 mm) of the bulk ore vibrating screen a enters the uniformly mixing ore tank through the 12# adhesive tape conveyor and the 10# adhesive tape conveyor, the process is single vibrating screen-a bulk ore vibrating screen operation, and the starting equipment is less, The second process is as follows: When the block ore screening operation with low powder content, low water content and easy screening is performed, a simpler and more efficient screening path is provided, the block ore to be screened is output by a No. 1 rubber belt conveyor below the raw ore buffer bin, directly enters the b ore vibrating screen through a three-way distributor I, oversize (with the particle diameter of the block ore being more than 6 mm) is buffered by a No. 9 rubber belt conveyor deblocking ore finished product bin, and is used by a blast furnace, undersize (with the particle diameter of the block ore being less than 6 mm) of the b ore vibrating screen enters a mixing and proportioning tank through a No. 10 rubber belt conveyor, the process is also single vibrating screen operation, the path is short, equipment is started to be minimum, and the equipment operation rate and the energy consumption level are effectively reduced.
  5. 5. The process for screening the lump ores in series and parallel under the condition based on the economic materials according to claim 2, wherein in the step 2, the powder content and the water content of the materials are primarily judged, the powder content of the lump ores is higher than 20%, and the water content is higher than 5%.

Description

Lump ore series-parallel screening process based on economic material condition Technical Field The invention relates to a lump ore series-parallel screening process based on an economic material condition, solves the problems of low powder content and improved economical efficiency of lump ores for a blast furnace, and belongs to a sintering raw material taking process in the metallurgical industry. Background With the promotion of low carbon, emission reduction and green development of the iron and steel industry, the reduction of energy consumption and pollutants in the preparation process of sinter and pellet by improving the proportion of lump ore in the blast furnace production is an important technical measure for realizing low carbon, emission reduction and clean production. At present, the water content and the powder content of lump ores are increased by mining high-quality iron ores of foreign mines to below the ground water level, the environmental protection requirement is greatly improved, water and dust are greatly sprayed in the lump ore transportation link to increase the water content, and the water content and the powder content of the lump ores are gradually increased due to the fact that steel mills adopt more economic materials in the existing market environment and the like. The lump ore varieties, powder content and water content of different areas and types are different, the screening difficulty and effect are also different greatly (part of the lump ore varieties with low water content and low powder content can meet the requirement through one screening), excessive powder ore is adhered to the surface of the lump ore (the powder content of the lump ore entering the blast furnace is generally less than 3 percent), and the air permeability of the blast furnace and the stable and smooth operation of the blast furnace are influenced by the introduction of the lump ore into the blast furnace, so that the iron-making cost is increased. At present, the industry generally adopts the offline small-flow screening of lump ores, ensures the screening powder content requirement, stores and supplies the mode, and the mode occupies large space and has higher running cost. The applicant finds that according to the invention patent application number CN201510767468.8, the invention relates to a method for screening a three-stage lump ore of a raw material, which comprises the following steps of firstly taking lump ore of a stock ground through a material taking machine, sorting to obtain refined lump ore I through 18 x 5mm sieve holes in a series screening system, and conveying the refined lump ore I to a blast furnace, secondly conveying coarse lump ore left after sorting the refined lump ore I through 18 x 5mm sieve holes in the series screening system to 8 x 25mm sieve holes of a crushing screening system through a belt conveyor to obtain refined lump ore II and refined lump ore III, thirdly conveying the refined lump ore II to the stock ground through a stacker, and fourthly conveying the refined lump ore III to the blast furnace for refining. According to the method for screening the three-stage lump ore of the raw material, the raw material yard is modified by the three-stage output system of the raw material, a new screening system is connected in series with the original screening system, lump ore is directly conveyed to a blast furnace to participate in smelting after being screened for the second time, so that the energy production pressure of a crushing operation area is relieved, and meanwhile, the electric energy consumption of ton ore treatment is correspondingly reduced. However, the invention has long process flow, large occupied area, large engineering investment and the like and needs to build facilities such as a transfer station. The searching also finds that the furnace lump ore drying process facilities are increased by the Mars Limited company and the like, and the water content of the lump ore can be effectively controlled, so that the screening effect of the lump ore is ensured, the powder content of the furnace lump ore is further reduced, and the furnace lump ore charging proportion is improved. The method also has the problems of high investment, high process operation difficulty and high comprehensive cost, and is mostly used in rainy seasons and periods of high water content. More practice in the industry is, for example, to use a three (multi) level sieve series screening process for a Bao-steel stock Bao-shan base, so that the block ore screening effect is guaranteed, and the method is long in process flow and high in processing cost. Therefore, a new solution is urgently needed to solve the above technical problems. Disclosure of Invention The invention aims to solve the technical problems of overcoming the prior art, providing a lump ore series-parallel screening process based on economic material conditions, adding a material flow switching facility under the co