CN101758240B - Method for producing reduced ilmenite powder for welding rod through rotary kiln - Google Patents
Method for producing reduced ilmenite powder for welding rod through rotary kiln Download PDFInfo
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- CN101758240B CN101758240B CN200910226655XA CN200910226655A CN101758240B CN 101758240 B CN101758240 B CN 101758240B CN 200910226655X A CN200910226655X A CN 200910226655XA CN 200910226655 A CN200910226655 A CN 200910226655A CN 101758240 B CN101758240 B CN 101758240B
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Abstract
The invention discloses a method for producing reduced ilmenite powder for a welding rod through a rotary kiln, which is characterized by comprising the following steps: selecting 10 parts of ilmenite powder, and 3 to 4 parts of coal powder according to general requirements, mixing the powder into raw materials; placing the raw materials into the rotary kiln for roasting and reducing, wherein the roasting temperature is controlled in three regions: the preheating temperature at a kiln tail is 400 to 520 DEG C; the temperature of a burning zone is 950 to 1,150 DEG C; the temperature which keeps the slight pressure at a kiln head is 780 to 850 DEG C; and cooling the material after roasting and reducing by using a cooling kiln, and then performing the classifying process on the material to produce the finished product. The method has the characteristics that: Without using lime as a desulfurizing agent, so the process is simplified, the content of carbon is reduced, the quality of products is ensured, the cost is reduced and the benefit is increased.
Description
Technical field
The invention belongs to reduced ilmenite powder preparation method, be specifically related to a kind of method of producing reduced ilmenite powder for welding rod through rotary kiln.
Background technology
The reduced ilmenite powder is a primary raw material of producing welding rod, the existing main technique method (patent No.: 01131633) be divided into operations such as feedstock production, the reduction of widely different rotary kiln, cooling kiln cooling, selected processing of producing the reduced ilmenite powder with widely different rotary kiln.One of defective that this technology exists is that the raw material in the feedstock production operation also must be made desulfurizing agent with lime except that adopting ilmenite powder, coal dust, make production cost increase, and the content of increase carbon brings influence to product quality.
Summary of the invention
The method that the purpose of this invention is to provide a kind of producing reduced ilmenite powder for welding rod through rotary kiln that can reduce production cost, improve the quality of products.
Realize that the technical scheme that the foregoing invention purpose adopts is: the method for producing reduced ilmenite powder for welding rod through rotary kiln; Comprise feedstock production, the reduction of widely different rotary kiln, cooling kiln cooling, selected treatment process; In said feedstock production operation; Get 10 parts of ilmenite powders, coal dust 3-4 part is mixed into raw material; In said widely different rotary kiln reduction operation, divide three sections Region control with calcination temperature in the widely different rotary kiln, kiln tail preheat temperature is 400-520 ℃, and burning zone temperature is 950-1150 ℃, and kiln hood keeps 780-850 ℃ of the angry degree of pressure-fired;
Said raw material is selected the reduction coal dust that contains titanium dioxide>=47%, sulphur≤0.03, phosphorus≤0,04 ilmenite powder and fugitive constituent>=30%, caloric value＞5000 kilocalorie/kilogram, cementability≤3, fixed carbon 50%-65%, sulphur≤1 for use, and the particle diameter of coal dust is the 3-5 millimeter;
Said widely different rotary kiln reduction operation is that raw material is sent into calcination reduction in the kiln through the metering of conveyer belt electronics by the kiln tail, and the calcination time is 2-2.5 hour, and regional temperature control is taked with the coal rifle particle diameter to be sprayed into heating region less than 3 millimeters coal dust from kiln hood; Air pressure gun cooperates the coal powder injection motor in kiln, to send into air intake one time; Air quantity is controlled at 3-10 cube/minute, blast 900-15000Pa, and the 6-8 group blower fan that is installed in the kiln body is simultaneously selected and is a little sent into secondary air; Air quantity is controlled at 2-6 cube/minute, blast 600-900Pa;
Said cooling kiln refrigerating work procedure is to cool off fast after the material after the calcination reduction is got into cooling kiln by kiln hood, and isolated with air during cooling, kiln body employing water-cooling pattern is cooled to material between 30-40 ℃.
Said selected treatment process be with cooled material through weak magnetic primary election, screened 40 now, utilize the selection by winnowing de-carbon then, finally isolate non-magnetic material and obtain qualified products with magnetic separating method again.
The characteristics of this method are to make desulfurizing agent without lime.Because of common raw material ilmenite powder sulfur-bearing composition when not reducing is not more than 0.03% through being controlled at the sixth of the twelve Earthly Branches, and the sulphur that is higher than in the raw ore mainly comes from reducing agent.Ilmenite powder is in being reduced process; Because of existing, auxiliary material reduction coal dust (carbon) make the composition of sulphur increase; The sulphur of coal dust calcination volatilization forms atmosphere and permeates to ilmenite powder; Traditional practice is in calcination, to add a small amount of lime to slough the sulphur in the coal dust as desulfurizing agent, but the adding of lime and do not reach desirable effect.This is that sulphur depends on the existence of carbon and keeps because the effective ingredient in the coal dust is a carbon, and coal dust carbon in reduction process is present in free form among the surface or mesh skeleton of reduction titanium products spongelike structure, or exists with the form of chemical combination attitude Fe.Therefore, reduce or the carbon removed in the reduction titanium products is the main place of desulfuration, as long as the carbon in the product is controlled at≤0.2%, s is≤0.03% national standard just also.And the inventive method is intended to utilize the kiln atmosphere that produces in the reduction calcination process to change; Subregion control temperature is reduced in calcination, improved kiln internal combustion condition thus, make carbon more abundant when burning; Sulphur in the carbon is discharged with gas form, therefore can not need to add in addition lime desulfurization.In addition, since the improvement of kiln internal combustion condition, the also corresponding quickening of calcination time; Shorten half an hour than the original production time; Burning zone temperature is controlled between the 900-1150 degree, also reduces more than 50 degree than original production method, and each item technical indicator has all reduced material consumption and energy consumption than former method.So the present invention has not sincerely reduced a kind of use of auxiliary material lime, tube has been changed technical process, reduces the content of carbon, the product of ensuring the quality of products, and reach and reduce cost the purpose of increasing the benefit.
Further specify technical scheme of the present invention below in conjunction with embodiment.
The specific embodiment
The method of producing reduced ilmenite powder for welding rod through rotary kiln is carried out according to the following steps:
1, feedstock production; Select for use and contain titanium dioxide>=47%, sulphur≤0.03, phosphorus≤0,04 ilmenite powder; The reduction coal dust of fugitive constituent>=30%, caloric value＞5000 kilocalorie/kilogram, cementability≤3, fixed carbon 50%-65%, sulphur≤1; Get 10 parts of ilmenite powders then; Coal dust 3-4 part, the particle diameter of coal dust are the 3-5 millimeter, and coal dust and ilmenite powder are mixed into raw material;
2, widely different rotary kiln calcination reduction; Raw material after the preparation is sent into calcination reduction in the kiln through the metering of conveyer belt electronics by the kiln tail, and calcination temperature divides three sections Region control, and kiln tail preheat temperature is 400-520 ℃; Burning zone temperature is 950-1150 ℃, and kiln hood keeps 780-850 ℃ of the angry degree of pressure-fired, and the calcination time is generally at 2-2.5 hour; Regional temperature control is taked with the coal rifle particle diameter to be sprayed into heating region less than 3 millimeters coal dust from kiln hood, and air pressure gun cooperation coal powder injection motor is sent into air intake one time in kiln, and air quantity is controlled at 3-10 cube/minute; Blast 900-15000Pa; The 6-8 group blower fan that is installed in the kiln body is simultaneously selected and is a little sent into secondary air, and air quantity is controlled at 2-6 cube/minute, blast 600-900Pa;
3, cooling kiln cooling; Material after the calcination reduction cools off after getting into cooling kiln by kiln hood fast, meets air oxidation for preventing material, and is isolated with air during the cooling kiln cooling, and kiln body employing water-cooling pattern is cooled to material between 30-40 ℃.
4, selected processing; Cooled material screened 40 now through weak magnetic primary election, utilized the selection by winnowing de-carbon then, finally isolated non-magnetic material and obtained the high-quality qualified products with magnetic separating method again.
Welding rod through the inventive method is produced is following with reduced ilmenite powder index:
The major technique condition:
1, common granularity :-40 orders 100% ,-160 order＜30%
2, outward appearance: particle is Dark grey, and the surface does not have rusty stain and foreign material.
3, chemical analysis (wt%) sees the following form:
Can know that by above index the welding rod that this method is produced has reached national standard fully with the reduced ilmenite powder.
Claims (2)
1. the method for a producing reduced ilmenite powder for welding rod through rotary kiln; It is characterized in that comprising feedstock production, the reduction of widely different rotary kiln, cooling kiln cooling, selected treatment process, in said feedstock production operation, get 10 parts of ilmenite powders; Coal dust 3-4 part is mixed into raw material; In said widely different rotary kiln reduction operation, divide three sections Region control with calcination temperature in the widely different rotary kiln, kiln tail preheat temperature is 400-520 ℃, and burning zone temperature is 950-1150 ℃, and kiln hood keeps 780-850 ℃ of pressure-fired temperature;
Said raw material is selected the reduction coal dust that contains titanium dioxide>=47%, sulphur≤0.03, phosphorus≤0,04 ilmenite powder and fugitive constituent>=30%, caloric value＞5000 kilocalorie/kilogram, cementability≤3, fixed carbon 50%-65%, sulphur≤1 for use, and the particle diameter of coal dust is the 3-5 millimeter;
Said widely different rotary kiln reduction operation is that raw material is sent into calcination reduction in the kiln through the metering of conveyer belt electronics by the kiln tail, and the calcination time is 2-2.5 hour, and regional temperature control is taked with the coal rifle particle diameter to be sprayed into heating region less than 3 millimeters coal dust from kiln hood; Air pressure gun cooperates the coal powder injection motor in kiln, to send into air intake one time; Air quantity is controlled at 3-10 cube/minute, blast 900-15000Pa, and the 6-8 group blower fan that is installed in the kiln body is simultaneously selected and is a little sent into secondary air; Air quantity is controlled at 2-6 cube/minute, blast 600-900Pa;
Said cooling kiln refrigerating work procedure is to cool off fast after the material after the calcination reduction is got into cooling kiln by kiln hood, and isolated with air during cooling, kiln body employing water-cooling pattern is cooled to 30-40 ℃ with material.
2. the method for producing reduced ilmenite powder for welding rod through rotary kiln according to claim 1; It is characterized in that said selected treatment process is through weak magnetic primary election with cooled material; Screened 40 now; Utilize the selection by winnowing de-carbon then, finally isolate non-magnetic material and obtain qualified products with magnetic separating method again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910226655XA CN101758240B (en) | 2009-12-17 | 2009-12-17 | Method for producing reduced ilmenite powder for welding rod through rotary kiln |
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| CN200910226655XA CN101758240B (en) | 2009-12-17 | 2009-12-17 | Method for producing reduced ilmenite powder for welding rod through rotary kiln |
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| CN101758240A CN101758240A (en) | 2010-06-30 |
| CN101758240B true CN101758240B (en) | 2012-04-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102352433A (en) * | 2011-10-20 | 2012-02-15 | 天津市宏远钛铁有限公司 | Process for producing reduced titanium iron powder by rotary kiln |
| CN109666805A (en) * | 2018-12-25 | 2019-04-23 | 海南文盛新材料科技股份有限公司 | A kind of ilmenite low-temperature reduction technique |
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