CN1013588B - Process for utilizing rich iron but poor manganese ore - Google Patents
Process for utilizing rich iron but poor manganese oreInfo
- Publication number
- CN1013588B CN1013588B CN 88104767 CN88104767A CN1013588B CN 1013588 B CN1013588 B CN 1013588B CN 88104767 CN88104767 CN 88104767 CN 88104767 A CN88104767 A CN 88104767A CN 1013588 B CN1013588 B CN 1013588B
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- manganese ore
- ore
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- rotary kiln
- poor
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Abstract
The present invention relates to a novel technique for utilizing high-Fe lean-Mn ore with a reduction smelting method. The present invention is mainly characterized in that lean-Mn ore whose Mn and Fe ratio is very low and from 0.2 to 2.0 is used as raw material, coal is used as reducing agents and fuel, and limestone is used as desulfurizing agents; furnace charge enters a rotary furnace after prereducing, and is selectively reduced into a solid state; the reduction products of solid Fe and solid MnO are discharged by a rotary fire grate, and enter a smelting furnace to be smelted and separated, and slag which is rich in Mn and a qualified steel grade are obtained. In the technique, the total recovery rate of Mn and Fe reaches 85 to 90%, and the recovery rate of lead and zinc is as high as 85%.
Description
The invention belongs to the smelting technology of iron alloy and steel, mainly be applicable to development and use the extremely low poor manganese ore of Mn-Fe ratio.
At present, all there are the extremely low poor manganese ore of a large amount of Mn-Fe ratios (contain manganese 10～28%, iron content is more than 20%, Mn/Fe=0.2～2.0) in China and other many countries.The mechanical beneficiation method can not be separated the ferrimanganic in this type of ore deposit and enrichment.So that this class ore deposit can not smelt iron, and can not be regarded as slow-witted ore deposit always and abandon as the raw material of Mn series alloy.This class poor manganese ore is again the main manganese resource of China.For this reason, the development and use poor manganese ore has a great economic significance.
Utilize in the technology of poor manganese ore existing, comparatively advanced is " blast furnace two step method poor manganese ore ferromanganese smelting novel process ".The first step of this technology is in blast furnace, and poor manganese ore is carried out selective reduction, obtains rich manganese slag; Second step was in another blast furnace, with the high basicity high magnesia of rich manganese slag collocation part agglomerate, produced carbon element ferromanganese.
The main drawback of this technology is that the poor manganese ore manganese content scope that is suitable for is only limited to 23～30%, and iron requires to be not more than 10%, and being lower than 20% poor manganese ore can't handle for manganese content; In addition, need the high starting material of energy consumption such as coke, agglomerate; Need two blast furnaces besides, technology is complicated.
The object of the present invention is to provide and a kind ofly can handle the extremely low poor manganese ore of Mn-Fe ratio (contain manganese 10～28%, iron content is more than 20%, Mn/Fe=0.2～2.0), and the novel process that energy consumption is low and the equipment quick-reading flow sheets is short.
Its main technique flow process is divided two stages: the fs is reduction apparatus with the rotary kiln, adopt cheap coal to make reductive agent, Wingdale is a sweetening agent, with the coal dust firing is thermal source, ferric oxide in the poor manganese ore and manganese oxide are carried out the selectivity solid state reduction, products therefrom is solid-state Fe and MnO, reaches the isolating purpose of Fe, Mn; Subordinate phase is utilized smelting furnace (electric arc furnace or intermediate frequency, line frequency induction furnace etc.) that the solid product Fe of fs is melted with MnO to separate.After the fusing, the Mn in the reduzate enters slag with the MnO form, and enrichment gets up, and becomes the high manganese ore of commodity-Fu manganese slag, can be used as the raw material of ferromanganese smelting or silicomanganese; Fe in the reduzate becomes molten steel and stays in the stove, becomes the steel grade of the various trades mark by refining.If contain harmful elements such as lead, zinc, sulphur in the poor manganese ore raw ore, then can in the reduction process of rotary kiln, remove.
In order to save the energy, consider to utilize the hot flue gas of rotary kiln in the technical process, be provided with pre-reducing furnace.The poor manganese ore and the part coal that add rotary kiln pass through pre-reducing furnace earlier, utilize the waste heat of flue gas, poor manganese ore is carried out prereduction, and then enter in the rotary kiln.Subordinate phase melts in smelting furnace when separating Fe, Mn, also can adopt coal dust firing to replace electric energy.
Compared with prior art, major advantage of the present invention is as follows:
(1) can utilize manganese content only is 10～28% the extremely low poor manganese ore of Mn-Fe ratio, reaches the purpose that makes full use of resource.
(2) with non-coking coal as reductive agent and fuel, cost is low.
(3) product one of whole technological process is to contain Mn to measure the rich manganese slag that reaches more than 46%, the one, and qualified grade of steel does not have waste, obvious economic.
(4) compare with prior aries such as blast furnace two step methods, facility investment is few, instant effect.
Description of drawings
The process flow sheet that accompanying drawing utilizes for rich iron but poor manganese ore of the present invention.1,2,3 feed bins that add that are respectively poor manganese ore, reductive agent, sweetening agent among the figure, 4 is rotary kiln, 5 is cooling cylinder, 6 is smelting furnace, 7 is pre-reducing furnace, and 8 is fly-ash separator, and 9 is settling pocket, 10 is coal burner, 11,12 is secondary air channel, and 13,14,15 is transport pipe, and 16,17 is sieve apparatus, 18,19 is screen underflow, and 20 is the stove tail.
The poor manganese ore that raw material-Mn-Fe ratio that this technology adopted is extremely low, the main component scope is: 10～28%Mn, Fe＞20%, Mn/Fe=0.2～2.0.The poor manganese ore of going into stove can be the lump ore through fragmentation, and granularity is 8～16mm, also can adopt the pelletizing of poor manganese ore powder behind sintering.Reductive agent and thermal source fuel adopt cheap non-coking coal powder, are sweetening agent with the Wingdale.Go back original product in order to make sulphur in the coal not enter or enter less, the weight of sweetening agent should be 5～20% of reductive agent weight, reductive agent granularity 0.5～7.5mm.
Poor manganese ore, reductive agent and sweetening agent feed in raw material by adding feed bin 1,2,3 respectively, and enter rotary kiln 4 through pre-reducing furnace 7.
Pre-reducing furnace utilizes the waste heat of rotary kiln flue gas to heat, and furnace temperature can reach 400～1050 ℃.Furnace charge enters rotary kiln after prereduction, poor manganese ore reduces the iron of high price and the oxide compound of manganese in rotary kiln, that is:
Through the poor manganese ore of prereduction hot entering in the rotary kiln 4 with 600～900 ℃.
Rotary kiln is nozzle 10 coal injection in stove by discharge end, heats stove by combusting coal fines.Temperature range in the rotary kiln is 900～1150 ℃, and to discharge end, temperature raises gradually by feed end, the highest reduction temperature district is 1100～1150 ℃, after furnace charge enters rotary kiln, carries out solid state reduction, promptly finish above-mentioned reaction formula (1) to (7), particularly (3), (6) and (7).At 1000～1150 ℃, the oxide compound of iron reaches drastic reduction in the poor manganese ore, and the ferriferous oxide more than 92% is reduced into Fe; The oxide compound of manganese almost all is reduced into manganese at a low price by high price manganese, promptly is reduced into MnO.So far, reach the isolating purpose of iron, manganese of rich iron but poor manganese ore by rotary kiln.
Reduzate behind the rotary kiln solid state reduction (Fe and MnO) after the discharge end discharge, can enter smelting furnace with cold burden or heat material through two passages: the one, and after transport pipe 14 and sifter 16 screenings, heat expects directly to enter smelting furnace 6; The 2nd, enter cooling cylinder 5, be cooled to 50 ℃ after, through 17 screenings of transport pipe 15 and sifter, its cold burden enters smelting furnace 6.
Undersized product after sifter screening adds in the fine ore and returns use less than the original product of going back of 0.5mm, and is pressed into the solidifying agent of pelletizing as fine ore, adds in the smelting furnace stove greater than the original product of going back of 0.5mm; The nonmagnetics that magnetic separation is separated in the undersized product still returns technological process greater than the superfluous coal dust of the conduct of 0.5mm granularity and uses, less than using as domestic fuel of 0.5mm granularity.
Enter the hot reduzate (Fe and MnO) of smelting furnace 6, make its fusing by heating.MnO after the fusing enters slag, and enrichment gets up, and forms rich manganese slag.This rich manganese slag contains the Mn amount and reaches more than 46%, is the high manganese ores of a kind of commodity, can be used as the raw material of ferromanganese smelting or silicomanganese.Become molten steel behind the melting of metal in the reduzate and stay in the stove, become the qualified steel of the various trades mark by refining.If contain lead, zinc, sulphur in the poor manganese ore, then can be after fusing separate, dephosphorization in molten steel obtains phosphorous qualified steel grade.
Above-mentioned whole flow process, the total yield of iron and manganese is very high, reaches 85～95%, lead, zinc, the rate of recovery reach more than 85%.
Claims (5)
1, a kind of rich iron but poor manganese ore of reducing smelting process that adopts utilizes technology, it is characterized in that with composition range be 10～28%Mn, Fe＞20%, the poor manganese ore of Mn/Fe=0.2～2.0 is a raw material, and coal is a reductive agent, Wingdale is a sweetening agent, and sweetening agent weight is 5～20% of reductive agent weight; After 400～1050 ℃ of temperature ranges are carried out prereduction in pre-reducing furnace, enter rotary kiln, carry out the selectivity solid state reduction 900～1150 ℃ of temperature ranges; Solid-state Fe of its reduzate and MnO directly enter smelting furnace after being discharged by the rotary kiln discharge end, melt separation, obtain rich manganese slag and qualified grade of steel.
2, technology according to claim 1 is characterized in that poor manganese ore can be the lump ore through fragmentation, and granularity 8～16mm also can adopt the pelletizing of poor manganese ore powder behind sintering.
3, technology according to claim 1 is characterized in that reductive agent and thermal source fuel adopt inexpensive non-coking coal powder, reductive agent granularity 0.5～7.5mm.
4, technology according to claim 1 is characterized in that rotary kiln is a thermal source with the coal dust firing that sprays into from the discharge end nozzle.
5,, when it is characterized in that fusing separates Fe, Mn in smelting furnace, can adopt coal dust firing to replace electric energy according to claim 1 and 3 described technologies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104767 CN1013588B (en) | 1988-08-06 | 1988-08-06 | Process for utilizing rich iron but poor manganese ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104767 CN1013588B (en) | 1988-08-06 | 1988-08-06 | Process for utilizing rich iron but poor manganese ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1040058A CN1040058A (en) | 1990-02-28 |
| CN1013588B true CN1013588B (en) | 1991-08-21 |
Family
ID=4833129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88104767 Expired CN1013588B (en) | 1988-08-06 | 1988-08-06 | Process for utilizing rich iron but poor manganese ore |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013588B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417972B (en) * | 2011-12-16 | 2013-04-10 | 云南德宁生物化工研究有限公司 | Method for preparing iron ore concentrate and manganese chemical products by carrying out dual reduction on refractory ferro-manganese symbiotic lean ore |
| CN104630459B (en) * | 2015-01-04 | 2017-06-16 | 北京科技大学 | A kind of self-heating for being applied to induction furnace casting contains carbon ball/block |
| CN105714120A (en) * | 2016-04-12 | 2016-06-29 | 唐山市金岭工贸有限公司 | Comprehensive utilization method of low-quality ferromanganese ore slag and steel iron industrial waste |
| CN107828930A (en) * | 2017-11-10 | 2018-03-23 | 唐竹胜 | A kind of high phosphorus high ferro difficulty selects the method that the deferrization of manganese ore dephosphorization produces ultrapure Mn-rich slag |
| CN109439895A (en) * | 2018-11-23 | 2019-03-08 | 江苏科技大学 | A kind of restoring method of polymetallic nodules |
| CN111100982B (en) * | 2019-12-27 | 2021-09-10 | 宁夏晟晏实业集团能源循环经济有限公司 | Process for smelting manganese-rich slag from high-aluminum lean-manganese iron ore and high-sulfur coke |
| CN111100981B (en) * | 2019-12-27 | 2021-11-02 | 宁夏晟晏实业集团能源循环经济有限公司 | Method for improving metallurgical performance of manganese-rich slag smelted manganese sinter |
| CN111074037B (en) * | 2019-12-27 | 2021-11-02 | 宁夏晟晏实业集团能源循环经济有限公司 | Process method for upgrading structure of manganese-rich slag smelting product |
| CN112029937A (en) * | 2020-08-21 | 2020-12-04 | 中国恩菲工程技术有限公司 | Comprehensive recycling and disposal process and equipment for electrolytic manganese slag |
| CN115717179B (en) * | 2022-12-29 | 2024-03-26 | 山东莱钢永锋钢铁有限公司 | Converter and alloying method for refining and reducing manganese element in lean manganese ore |
-
1988
- 1988-08-06 CN CN 88104767 patent/CN1013588B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1040058A (en) | 1990-02-28 |
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