Method for improving viscosity performance of iron ore powder

Abstract

The invention relates to a method for improving the viscosity performance of iron ore powder. The method comprises the following steps that 1, a dispersing agent is added into the iron ore powder with the viscosity to be improved for pretreatment; 2, a modifying agent is prepared; 3, the modifying agent is added; according to the technical scheme, the iron ore powder with the large bonding performance can be produced and used after being improved, the viscosity of the iron ore powder can be effectively reduced, and the production problems such as stock bin blockage caused by the fact that the iron ore powder is too large every year are solved.

Description

Technical Field

[0001] The present invention relates to an improvement method, specifically to a method for improving the viscosity performance of iron ore powder, and belongs to the technical field of ironmaking sintering production in the iron and steel metallurgy field. Background Art

[0002] The stability of the iron ore powder batching is related to the stability of the sintering production. The stability of the sintering production process is not only very important for the sintering production itself, but also of great significance for the stable and smooth operation of the blast furnace. As is well known, the stability of the sintering process requires not only the stability of the composition of the iron ore powder itself, but also the accurate weighing of the batching system. The prerequisite for accurate batching requires that the iron ore powder material has a small viscosity to ensure smooth feeding of the material.

[0003] In iron and steel enterprises, during the sintering batching process in the ironmaking plant, it often happens that due to the too high viscosity of a certain iron ore powder, the feeding is not smooth, which affects the accuracy of the batching in the sintering process. More seriously, due to the too high viscosity of the iron ore powder, it causes blockage in the bin, and finally the sintering cannot be stably produced.

[0004] "A Test Method for the Bonding Performance of Iron Ore Powder" (Patent No. 201710958566.9) invented by Ma Huaiying, Pan Wen, etc. of Shougang Group Co., Ltd. discloses a test method for the bonding performance of iron ore powder. The invention proposes to mix slaked lime, iron ore powder and water, stir to obtain a slaked lime suspension, and use a rheometer to measure the viscosities of the iron ore powder and the slaked lime suspension. The main purpose of this invention is to provide a reference basis for reasonably matching and using various iron ore powders to obtain good granulation effects. This invention uses another binder, quicklime, to participate in the liquid preparation for viscosity measurement. However, this method can provide a reference for the granulation effect to a certain extent, but it is difficult to objectively and effectively determine the viscosity of the iron ore powder itself, because the iron ore powder is insoluble in water and easily precipitates, so the measurement at different time periods has a very large impact on the results, and it is difficult to objectively reflect the specific viscosity of the iron ore powder. Moreover, the viscosity of the iron ore cannot be improved through detection means.

[0005] Therefore, it is necessary to research and invent a method for improving the viscosity of iron ore powder to address the deficiencies of the existing technology and solve or alleviate one or more of the above problems. Summary of the Invention

[0006] The present invention precisely aims at the problems existing in the prior art and provides a method for improving the viscosity performance of iron ore powder. This technical solution is beneficial for the production and use of iron ore powder with relatively large bonding performance after improvement, can effectively reduce the viscosity of the iron ore powder, and solve production problems such as bin blockage caused by high viscosity of the iron ore powder.

[0007] To achieve the above object, the technical solution of the present invention is as follows. To solve the problem that iron ore powder affects normal batching due to excessive viscosity, the present invention provides a method for improving the bonding performance of iron ore powder, which includes four steps: pretreatment of adding a dispersant to the iron ore powder to be improved in viscosity, preparation of a modifier, addition of the modifier, and mixing and homogenization:

[0008] Step 1: Specularite is added as a dispersant to the iron ore powder to be improved in viscosity; specularite ore with a particle size of 0.25 - 2.00 mm and a moisture content of less than 3.0% is added, and the addition amount is 0.05 - 1.50% of the weight of the iron ore powder to be improved in viscosity;

[0009] Step 2: Preparation of the modifier. The main components of the modifier are a copolymer of acrylic acid and allyl hydroxypropyl sulfonate ether; a copolymer of maleic anhydride and diisobutene; a terpolymer of acrylic acid, 2 - acrylamide - 2 - methylpropanesulfonate, and tert - butyl acrylamide;

[0010] Step 3: Addition amount of the modifier. The modifier can effectively reduce the viscosity of the iron ore powder, and the addition amount is 0.0001 - 0.0050 parts of the modifier per 1 part of the iron ore powder to be improved in viscosity;

[0011] Step 4: The above - mentioned modifier is fully mixed with the iron ore powder to be improved in viscosity after pretreatment, or the modifier is first mixed with the specularite dispersant in Step 1 and then added to the iron ore powder to be improved in viscosity. This step is the key to implementing the technical solution of the present invention. During the production process, it can be evenly added during the shipment, stacking, or reclaiming of the iron ore powder to achieve the effect of reducing viscosity.

[0012] Compared with the prior art, the present invention has the following advantages: 1. The amount of the modifier used in the present invention is small and the application cost is low; 2. The dispersant selected in the present invention is specularite, which has a relatively high iron grade, but due to its low viscosity and poor granulation effect, the market price is often low. Through the present invention, advantages and disadvantages can be complementary to improve the utilization value of specularite; 3. The modifier used in the present invention is simple to configure and the amount used is small; 4. The iron ore powder treated by the present invention will not have an adverse impact on the subsequent sintering or pelletizing of the iron ore powder and will not reduce the iron grade of the iron ore powder; 5. The iron ore powder treated by the present invention can make the treated iron ore powder and other iron ore powders be more fully mixed, so as to achieve the purpose of stabilizing the chemical composition of sintered ore or pellet ore; 6. The amount of the modifier used is small. After the organic matter of the modifier is burned, it will not remain in the sintered ore or pellet ore and will not affect the flue gas emission. Specific embodiments

[0013] To deepen the understanding of the present invention, the following detailed description is made in conjunction with embodiments.

[0014] Example 1: The method provided by the present invention for improving the viscosity of iron ore powder is mainly used to solve the problem that the normal addition of iron ore powder is affected due to its high viscosity. The high viscosity of iron ore powder will affect its smooth discharging in the iron ore bin and easily cause the phenomenon of bin blockage. Especially in rainy days, the water content of iron ore powder increases, and the above problems become more prominent. By the method of the present invention, the viscosity of iron ore powder can be effectively reduced, and production problems such as bin blockage caused by high viscosity can be solved.

[0015] The binder of the present invention is realized through the following technical solutions:

[0016] The present invention provides a method for improving the bonding performance of iron ore powder. The technical solution is realized through the following main steps, including four steps: adding a dispersant to the iron ore powder whose viscosity needs to be improved for pretreatment, preparing a modifier, adding the modifier, and mixing evenly.

[0017] S1: Specularite is added as a dispersant to the iron ore powder whose viscosity needs to be improved; specularite ore with a particle size of 0.25 - 2.00 mm and a moisture content of less than 3.0% is added, and the addition amount is 0.05 - 1.50% of the weight of the iron ore powder whose viscosity needs to be improved; specularite as a dispersant can play a role in dispersing the iron ore powder and overall reduce the viscosity of the iron ore powder.

[0018] S2: Preparation of the modifier. The main components of the modifier are copolymers of acrylic acid and allyl hydroxypropyl sulfonate ether; copolymers of maleic anhydride and diisobutene; terpolymers of acrylic acid with 2 - acrylamido - 2 - methylpropanesulfonate and tert - butyl acrylamide; the main components of the modifier can be the above single substance or a mixture of them. The above modifiers have a strong effect of reducing viscosity, and adding a small amount in iron ore can play a good role in reducing viscosity.

[0019] S3: Addition amount of the modifier. The modifier can effectively reduce the viscosity of iron ore powder, and the addition amount is 0.0001 - 0.0050 parts of the modifier added to each 1 part of the iron ore powder whose viscosity needs to be improved.

[0020] S4: The above modifier is fully mixed with the iron ore powder whose viscosity needs to be improved after pretreatment, or the modifier is first mixed with the specularite dispersant in step one and then added to the iron ore powder whose viscosity needs to be improved. This step is the key to realizing the technical solution of the present invention. During the production process, it can be evenly added during the shipment or stacking and reclaiming of iron ore powder to achieve the effect of reducing viscosity.

[0021] This patent elaborates on the above - mentioned technical solution through 1 example:

[0022] Example 2:

[0023] Step 1: Selection and addition of dispersant. Select IOC specularite from Canada as the dispersant. Add IOC specularite to the higher-viscosity Sierra iron ore powder at a ratio of 0.5% of the Sierra iron ore powder; the average particle size of IOC specularite is 0.88 mm and the moisture content is 2.1%.

[0024] Step 2: Preparation of modifier. The main components of the modifier are as follows: the copolymer of acrylic acid and allyl hydroxypropyl sulfonate ether is 42.5%; the copolymer of maleic anhydride and diisobutene is 28.5%; the terpolymer of acrylic acid, 2-acrylamido-2-methylpropanesulfonate, and tert-butyl acrylamide is 29.0%. The modifier has a very strong viscosity-reducing effect, and adding a small amount in iron ore can play a good role in reducing viscosity.

[0025] Step 3: Dosage of modifier. The modifier can effectively reduce the viscosity of iron ore powder, and the dosage is 170 g of the above modifier per ton of Sierra iron ore powder;

[0026] Step 4: Thoroughly mix the above modifier with the pre-treated Sierra iron ore powder.

[0027] The viscosity of the improved Sierra iron ore powder is reduced from 0.95 Pa·S before improvement to 0.13 Pa·S. The frequency of blockage of the improved Sierra powder is greatly reduced, and the effect is very obvious.

[0028] The above is a method for improving the green ball strength of pre-pelleted concentrate powder provided by an embodiment of the present application. The organic binder provided by the present invention can effectively improve the green ball strength of pre-pelleted concentrate. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

[0029] It should be noted that the above embodiments are not used to limit the protection scope of the present invention. Equivalent transformations or substitutions made on the basis of the above technical solutions fall within the protection scope of the claims of the present invention.

Claims

1. A method for improving the viscosity performance of iron ore powder, characterized in that, The method includes the following steps: Step 1: Pretreat the iron ore powder with improved viscosity by adding a dispersant. Step 2: Preparation of the modifier. Step 3: Addition of the modifier. Step 4: Mix evenly thoroughly.

2. The method for improving the viscosity performance of iron ore powder according to claim 1, wherein, Step 1 is specifically as follows: Specularite is added as a dispersant to the iron ore powder with improved viscosity; Specularite ore with a particle size of 0.25 - 2.00 mm and a moisture content of less than 3.0% is added, and the addition amount is 0.05 - 1.50% of the weight of the iron ore powder with improved viscosity.

3. The method for improving the viscosity performance of iron ore powder according to claim 1, wherein Step 2 is specifically as follows: Preparation of the modifier. The main components of the modifier are a copolymer of acrylic acid and allyl hydroxypropyl sulfonate ether; a copolymer of maleic anhydride and diisobutene; a terpolymer of acrylic acid, 2 - acrylamido - 2 - methylpropanesulfonate, and tert - butyl acrylamide.

4. The method for improving the viscosity performance of iron ore powder according to claim 1, wherein Step 3 is specifically as follows: The addition amount of the modifier. The modifier can effectively reduce the viscosity of the iron ore powder, and the addition amount is 0.0001 - 0.0050 parts of the modifier per 1 part of the iron ore powder with improved viscosity.

5. The method for improving the viscosity performance of iron ore powder according to claim 1, characterized in that, Step 4 is specifically as follows: Mix the above - mentioned modifier thoroughly with the iron ore powder with improved viscosity after pretreatment, or first mix the modifier with the specularite dispersant in Step 1 and then add it to the iron ore powder with improved viscosity.

6. Use of the modifier in the method for improving the viscosity performance of iron ore powder according to claim 1 for surface modification of iron ore, characterized in that, One or several of the copolymer of acrylic acid and allyl hydroxypropyl sulfonate ether, the copolymer of maleic anhydride and diisobutene, and the terpolymer of acrylic acid, 2 - acrylamido - 2 - methylpropanesulfonate, and tert - butyl acrylamide.