DE2353292A1 - REDUCTIVE ROESTING PROCESS FOR OXIDE ORES - Google Patents

Description

DR. BEHG DIPL-ING. STAPF

• MUNICH SO. MAUKITKIRCHERaTR. 48 2353292

Lawyer file 24 40g _{; 2} if. «■ October:

Be / Sch

Pacific Metals Ob. " Tokyo / Japan

"Reductive roasting process for oxide ores"

The present invention relates to a method for rediictive. Host verscniedener oxide ores verscniedener metals, such as iron ore _en% Uickeloxiderzen, manganese ores, Ghromerzen and titanium ores, to which is added a liquid * carbonaceous "reducing agent, such filchweröl and crude oil, ores and with these uniformly mixed and the ores in a roasting furnace such as a rotary kiln Roasts, shaft furnace or a fluidized bed RÖsfcvorrichtung to form reduced ores,; -

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toüci Boyseiüiw Vertltabanfc maamt 4SSIQt PeHwInAt

Be involved in a reaction refining where a Pre-binding furnace, such as a rotary furnace, a shaft furnace or a vibrating bed roasting oven with a melting and saff ining oven, like an electric oven, a fan oven and a Reverberierofen cooperates, this Process in metal reduction clay melting on a technical scale Widely used can if the pretreatment reduction speed increased and can be designed uniformly, the consumption of electrical power and on. Fuel in the melting furnace decreases and it can by stabilizing production quality and increased Yield of recovered metal, low-quality ores are used economically *

In conventional reduction roasting, solid ones become carbonaceous Materials or reducing gases such as GO and Sp * are used as reducing agents. In the case of solid It is difficult to achieve a completely uniform reducing agent Mixture of the ore and the reducing agent, even if the particle size of the materials for this purpose is discontinued and therefore a uniform reduction cannot be expected. Furthermore, the Reaction a contact reaction between solids and solids, so that a higher reduction speed; under other temperature conditions cannot be expected. On the other hand, when using reducing gases, explosive or toxic and their handling with hazards

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connected, with economic problems continuing occur from the point of view of the efficiency of the reducing gas.

It has now been found to have the following advantages can be achieved that one liquid carbonaceous Reducing materials, such as heavy oil and crude oil, add ores as reducing agents and use the ores to be reductive Roasting a roasting device such as a rotary kiln, a shaft furnace or a fluidized bed roasting device subject.

1) As the carbon-containing reducing materials, such as heavy oil and crude oil (hereinafter, for simplicity, heavy oil are liquid, they can easily penetrate the ores in such a way that they are uniformly mixed with the ores is ensured and the preceding reduction rate by the finely deposited carbon, that is caused by the breakdown of the heavy oil in the roasting device is noticeably increased and a uniform reduction in ores can be achieved.

2) The consumption of fuel for the heating burner is consumed by the combustion of the supplied heavy oil

I-

reduces and the roasting temperature can be lowered so that the total consumption of heavy oil of the unit is almost the same * as if no heavy oil was added.

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5) The use of carbonaceous materials will is reduced by the formation of carbon deposits due to the decomposition of the added heavy oil. It can continue all required carbonaceous materials are replaced by heavy fuel oil.

The reduction roasting according to the invention is now under Use of nickel iron oxide ores explained with reference to the accompanying drawing.

In this context, FIG. 1 shows, in an exemplary manner, schematically the reduction roasting of nickel iron oxide ores after the pre- ' lying invention.

Conventionally, when nickel iron oxide ores are roasted in a rotary kiln 1, the amount of dust reaches about $ 6 the roasted ores and the dust are collected by dust collectors 2, 3 and 4 connected to the rotary kiln, in a constant amount of a kneading mill (pan mill) 6 fed and kneaded by adding water to prevent it from being blown out by the wind. The connected Dust is mixed through together with the ores from the ore container 9 and carbonaceous materials an extruder 7 pelletized and fed to the rotary kiln as a feed and roasted.

In contrast, according to the present invention, instead of water Heavy oil from a heavy oil container 8 the dust in a

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Amount of ΊΟ to 1QOj6 of the -reduction; The required amount of materials is supplied and the dust is kneaded together with the heavy oil through the kneading mill 6. It then becomes the ore of that. Benolder 9 edge carbonaceous materials mixed together with the kneaded dust and pelletized by the extruder 7, fed to the rotary kiln. 9OQ heated to ⁰ C by means of a HeizÖlbrenher 10 and roasted characterized. ■ ·

According to the process of the invention, the addition of heavy oil in the way that you mix the entire amount of the required heavy oil with the dust or the ore or then the heavy oil directly to a high temperature zone of the Rotary kiln supplies.

The most desirable range of addition of liquid carbonaceous reducing material to different Metal oxide ores and the preferred range which becomes reduction roasting temperature given below.

Ickeloxiderzen is the case of the heavy ¥ "or crude oil in an amount of 50 to 80? Έ the theoretically required amount of reducing agent added, and carried out roasting at a temperature between 900 and 1QQO ⁰ C.

(2) In the case of manganese ores, this is heavy or crude oil in an amount of 20 to 50 ^ of the theoretically required Amount of reducing agent added and roasting at one

Temperature between 600 and 1000 ⁰ O carried out »

(3) In the case of iron ores, the heavy or crude oil is in an amount of $ 20 to $ 60 of the theoretically required Amount of reducing agent added and roasting at one Temperature between 900 and 1000 ° C carried out.

The invention is further illustrated by the following examples, without restricting the scope of the invention.

example 1

The present invention was practically carried out with a rotary kiln, which has a treatment capacity of 1200 to. per day (length 115 πι and diameter 5.5 m), the following nickel oxide, anthracite and heavy oil (quality C) was used, the results being compared with the ¹ conventional method.

(1) Analysis of the nickel ore

NiO + CoO Fe ^ Oz SiO ₂ MgO 3.15 18.45 40.2 25.3

AIpO ^ loss of burning moisture 0.9 11.20 27.0

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(2) Analysis of the anthracite (#) ■ -.

FG VM Ash P S 79.91 11.80 8.29 0.011 0.842

(3) Analysis of heavy oil quality G (#) _.

C H 0 Specific weight 83 13 '1.2 0.94

Table ί shows the working conditions, Table II gives analyzes of the roasted ores and Table III shows the previous reduction rates.

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- 8 Table I.

Amount of ore, used 'amount d. Total dry heavy oil Heavy oil Heavy oil ore, to for heating for adding consumption per hour of the burner

l / t dry ore

Erf incL-.

according to regulation 35- 60 25 85

travel

Conventional 35 85 - 85 drive ■

Table I (continued)

Amount of rotating grate exhaust gas tem-

mixed in dizziness temp. temperature

carbon d.

containing Ma furnace

terials IT.p.M. C G

kg / t dry

Ore ■.

According to the invention, 25 0.33 900 250 travel

Conventional.

ches ver ^ 40 0.33 1000 250

travel - . ^

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Procedure; Si M. , 98 T.We- · -.-- ■ ;;:-H , 24- moderate nmliehes
: tren 2, ie "96 V2 , * ■■■., Ii 6th '?? , 69

table II (Fogtsetzuaag)

11 = 0 ^ 88 MÄLBES-V & rf ahr / s'

HI

- "" "■ - ^; -2; »2 _ Λ YXjXjJp Conventional. '■ .-. /
¥ experience 1 . _ -

among the same works) edingiingeii was when 2 ^ 1 Söiiweröl-.euter ·, to. Uicfcelerz was added to the total oil verbraticli

, _n 235329t

of the unit is almost the same as when no heavy oil was used, but the amount of koh-. fuel-containing material was reduced by $ 37-5. By Schwerölzugäbe the Reduktionsgesehwindigkeit was eriiötet merlclicn namely by as © 15,3fac.ne at Niekel and 7 _r 25faQhe in iron compared to the work process without adding heavy oil.

This Irfindung was transferred into a rotary kiln durehge- * _r dep a treatment capacity of 40 tons. per day (length 25 m and diameter 1.3 m) using dsLß according to t olg © nd mentioned Mangaiierz _% pulverized egg "K®ks and Schwer, the results obtained being compared with the results of a conventional method *

(1) Analysis of the manganese ore

p Fe ₅ O _x SiOo-QaO MgO Al ₀ O _x Burning «H ₀ O ^{2 2 5 2 2 5} loss ²

81.70 3.6β 2> 6Q 0.53 0.20 0.13 12.05 3.2

(2) Analysis of the pulverized coke

. FC "VM ash F ■ ■ S ββ, Ο 1.80 12.20 O _r O55 0.66

(3) Analysis of heavy fuel oil quality Q

GHO Bpez, weight

85 13 1.2 0.94 409019/0794.

Table IV shows the working conditions, Table V the Analysis of the roasted ores and Table VI the preceding reduction rates.

Table IV -

'Amount of ore, amount used d. Total dry heavy oil Heavy oil Heavy oil ore, to for heating to add 'consumption per hour of the burner -'".-.^;." - .. ■ l / t. dry ore

Inventive

moderate procedure 1.5 50 30 80 -.

Conventional '-

Procedure 1.5 80 ■ - 80

Table IV (continued)

Amount of rotating grate exhaust gas tem-

mixed in "dwindling temp. temperature

carbon d.

containing Ma furnace

terials -, U.p.M. ■ 0

kg / t dry

Ore '.

According to the invention Method 180 '1.0 650 120

Conventional

Procedure 200 1.0 700 120

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Tabel

Table V (continued)

Table VI

T. Mn Mn 0 MnO ₂ 6th T.Fe According to the invention
procedure 59 , 42 54-, 22nd 27 2 .2.92; Conventional
procedure 57 , 76 41, 73 40, 2.81.

M.Fe FeO Fe ₂ O ₅ , 0 According to the invention
procedure 0.30 1.36 2.23 13.5 Conventional
procedure 0.24 1.13 2.42 16.0

(Mn ⁺² /T.Mn) (M.Fe + O, 259j? EO / (TJ? E) χ 100 $ χ 100 %

Method according to the invention 70.8

22.4

Conventional
procedure

56.0

19.0

Under the same working conditions, if 30 1 was heavy fuel oil

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per ton of manganese ore was added, the total heavy oil consumption of the unit was almost the same: as if no heavy oil was added, but the amount of carbonaceous materials used was reduced by $ 10. The previously mentioned reduction rates of manganese and iron were increased by the addition of heavy oil by 1.26 and 1.18 times, respectively, compared to working without the addition of heavy oil. .: ^v -. .-.

Example 3 , -. , ,,:, - ·

The present invention was made in one. Rotary kiln with a treatment capacity of 4-0 to * per iDag '(length 25 m -Tind
Diameter 1.3 m), whereby the example 2
used manganese ore and heavy oil was used, whereby
5 edoeh in that. Method of the present invention
Heavy oil addition rate increased by 1QQ ^ and at that
conventional process only uses powdered coke
became. Table 11 shows the working conditions, Table YXII shows the analyzes of the roasted ores and Table IX the preceding reduction rate.

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Table YII

Amount of ore, amount used ά. Total ■ ■ dry heavy oil heavy oil. Heavy fuel oil Ore: to. for heating to add · per hour of the burner.

l / t, dry ore

Method according to the invention

(Heavy oil allowances- "1.5 50 300 350 speed ioo #). '"■■ ·

Conventional

Method 1.5 100 ...- '... "100

VII (continued)

Amount of the rotary Ro & t exhaust gas mixed in dwindling temp. temp, carbon d. containing Ma furnace

terials rpm CC kg / t dry
ore

Method according to the invention -.
(Heavy fuel

speed - 0.8 650 300 5)

Conventional

Procedure 200 0.8? 00 300

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• - - 15 -
labelie VIII MnO , 10 - , 39 (M "-, MnO ₂ ■ - ^Fe 2 ° 3. T. Fe According to the invention
procedure 59 , 91 , 99 ' 24.0 2.05 3.03 Conventional
procedure T.Mn 43 - 38.9; ■ - / ■ _V 2.56 2.8 ^ - · According to the invention
Procedure · 61.01 FeO Conventional
procedure 58.61 1 Table VIII (cont etting) 0 C- . ■ ■. ■ ■ According to the invention
Procedure ."
Heavy oil additions
speed $ 100 M.Fe IX 10.7 Conventional
procedure 0.52 ^ 12.2 0.29 (Mn ⁺² ZT * Mn)
χ 100 ^ ,- Tabel 75.1. 58.0 . Fe + 0.259 FeO / T. Fe) ''":':'.
χ 100% "-. -I
29.0 19.2

Under the same working conditions, if 300 1 heavy fuel oil

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per to. Manganese ore (addition rate $ 100) added the foregoing reduction rates for manganese and iron became 1.3 and 1.51 times, im Increased compared to the conventional process without the addition of heavy oil. · ■

Example 4

The present process was carried out in a rotary kiln, which has a treatment capacity of 40 to. per day (length 25 m and diameter 1.3 m) iron ore mentioned below, pulverized "cokes" and heavy oil are used.

(1) Iron ore analysis

T.Fe FeO Fe ₃ O ₅ SiO ₃ CaO MgO 45.97 "7.35 57.60 .16.05 1.96 3.29

(2) Analysis of the pulverized coke FC VM ash P S 86.0 1.80 12.20 0.055 0.66

(3) Analysis of heavy fuel oil grade C

C H 0 Specific weight 83 13 1.2 0.94

Table X shows the working conditions, Table XI the analyzes of the roasted ores and Table XII which precedes them

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the overall reduction speeds compared to the conventional method *

- Table X "

Amount of ore, amount used. Total dry heavy oil Heavy oil sword Ore, to, for heating to add. per hour of the burner · ■ ■

l / t. dry ore

Method according to the invention 1.0 90 50

Conventional -, - "·,

Procedure -1.0 -120 / -

Table X (continued)

Amount of rotating grate exhaust

mixed in dizziness temp. temp,

carbon d.

haitigeh ma furnace

terials. U.p.M.

• kg / t dry ore

^P G

Method according to the invention 200 0.35 950 380

Conventional '

Procedure ■. 250 p, 35 '1050' "■ 380

* ■ - '-18-

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Table XI

T.Fe M.Fe FeO

Inventive

according to

Expires 49.14-2.70 56.24 3.92 0.20 13.3

Conventional method 44.40 0.52 39.98 18.00 0.15 19.0

Table XII

(M.Fe + 0.25 < According to the invention
procedure Conventional
procedure ^ FeO / T-Fe) χ 1OOJ & .35.2 24.5

Under the same working conditions, if 30 1 heavy fuel oil per to. Iron ore added to total heavy oil consumption the unit the same if no heavy oil was added, but with the amount of carbonaceous oil used Materials by 2C $ - reduced and € ie reduction speed of iron was increased by 1.44 times compared to the working method in which no heavy oil was admitted.

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It should be pointed out that in the preceding description and in the examples, the solid or gaseous Reducing materials conventionally the metal oxide ores can be added to be replaced by liquid reducing materials, such as heavy oil and / or crude oil, up to $ 100 it is possible to achieve a satisfactory reduction roasting in a roasting furnace such as a rotary kiln, to carry out without substantial modification of the conventional working conditions.

-Patent claims-

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Claims (3)

- 20 patent claims: 1. Process for the reductive roasting of metal oxide ores, characterized in that one adding liquid carbonaceous reducing agent to the ores and roasting the ores. 2. The method according to claim 1, characterized that the liquid carbonaceous reducing agent to the ores in an amount between 10 and $ 100 of the theoretically required amount of reducing agent admits. 3. The method according to claim 1, characterized that heavy oil and / or crude oil is used as the liquid carbonaceous reducing agent. 409819/0794