CN103882223A - Method for increasing bursting temperature of laterite nickel ore pellets - Google Patents
Method for increasing bursting temperature of laterite nickel ore pellets Download PDFInfo
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- CN103882223A CN103882223A CN201410129299.0A CN201410129299A CN103882223A CN 103882223 A CN103882223 A CN 103882223A CN 201410129299 A CN201410129299 A CN 201410129299A CN 103882223 A CN103882223 A CN 103882223A
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- red soil
- nickel ore
- soil nickel
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Abstract
The invention discloses a method for increasing bursting temperature of laterite nickel ore pellets, which belongs to the field of production and manufacture technology of pellets. The method includes the following steps: adding nickel flash smelting slag in laterite nickel ore, firstly performing a fine grinding pretreatment on the laterite nickel ore and the nickel flash smelting slag, then mixing materials, pelletizing and roasting to produce laterite nickel ore pellets, wherein the bursting temperature of the laterite nickel ore pellets is higher than 150 DEG C. When the laterite nickel ore pellets are manufactured by the method, the bursting temperature thereof can be increased to be higher than 150 DEG C, thereby being beneficial for the subsequent roasting processing of the laterite nickel ore pellets; moreover, the nickel flash smelting slag contains nickel, in this way, since the nickel flash smelting slag is added in the laterite nickel ore, the nickel content of the finished product pellets can not be reduced greatly.
Description
Technical field
The present invention relates to a kind of method that improves red soil nickel ore bursting temperature of pellet ores, belong to the manufacturing technology field of pellet.
Background technology
In recent years, along with the minimizing gradually of nickel sulfide ore resource and higher-grade red soil nickel ore resource, a large amount of nickel grades in the exploitation of the red soil nickel ore of 1% ~ 2% left and right day by day by people are paid close attention to.The at present domestic way generally adopting is from buying grade abroad the red soil nickel ore of 1%-2% left and right, is processed into agglomerate or pellet and produces ferronickel for blast-furnace smelting.But in the process of producing red soil nickel ore pellet, find, after red soil nickel ore is levigate, compared with conventional powdered iron ore, when pelletizing, especially easily balling-up, need not can prepare green-ball with addition of binding agents such as swelling soils substantially.But find in roasting process, the especially easily explosion of red soil nickel ore pelletizing, the burst temperature of conventional ball body of powder of iron ore nodulizing is generally more than 250 DEG C, and in the temperature of red soil nickel ore pelletizing more than 100 DEG C when preheating and baking, just serious cracking of pelletizing, therefore, when roasting red soil nickel ore pelletizing, first the dehydration of preheating at a lower temperature, otherwise the serious explosion of pelletizing will have a strong impact on the intensity of pellet.The way adopting be at present exactly in levigate red soil nickel ore with addition of a certain proportion of coarse fraction powdered iron ore to improve its preheating temperature, but DeGrain.And substantially not nickeliferous in conventional powdered iron ore, therefore, after conventional powdered iron ore, the nickel content of red soil nickel ore pellet significantly reduces again, has weakened its value of smelting nickel-containing molten iron as nickel-bearing raw material.
Therefore can develop new red soil nickel ore pellet manufacture method, to improve its burst temperature, the production of red soil nickel ore pellet be had to realistic meaning.
Summary of the invention
In order to overcome above-mentioned deficiency, the present invention aims to provide a kind of method that improves red soil nickel ore bursting temperature of pellet ores, while manufacturing red soil nickel ore pellet by present method, its burst temperature can be brought up to more than 150 DEG C, is conducive to the follow-up roasting processing of red soil nickel ore pellet.
A kind of method that improves red soil nickel ore bursting temperature of pellet ores provided by the invention, comprise batching, red soil nickel ore and the fine grinding of nickel flash smelting slag, batch mixing, pelletizing, roasting adds the nickel flash smelting slag after fine grinding in red soil nickel ore, and then pelletizing, roasting, produce red soil nickel ore pellet.
Said method comprising the steps of:
(1) batching:
Red soil nickel ore, nickel flash smelting slag are prepared burden in following ratio, and concrete proportioning is:
75 ~ 90 parts of red soil nickel ores;
10 ~ 25 parts of nickel flash smelting slags;
(2) the levigate fine grinding of red soil nickel ore:
Red soil nickel ore is levigate, and its granularity is less than the ratio of 0.074mm between 65 ~ 85%.
(3) nickel flash smelting slag fine grinding:
By thin nickel flash smelting sizing, its granularity is less than the ratio of 0.074mm between 45 ~ 75%, and controls the content of its molecular water and capillary water: molecular water is less than 2%, and capillary water is greater than 25%; .
(4) batch mixing, pelletizing:
Above-mentioned preprocessing compound after treatment pelletizing in balling disc, the particle diameter of its pellet is 12mm ~ 20mm;
(5) roasting:
Red soil nickel ore pelletizing is carried out to roasting baking on equipment, obtain finished product red soil nickel ore pellet.
The component of described nickel flash smelting slag is: NiO:0.4-1%, TFe:34%-40%, SiO
2: 30-35%, CaO:2-5%, MgO:4-8%, burn out rate 0.3-0.6%.
When roasting, sinter process parameter is suitably adjusted according to need of production.
The method of raising red soil nickel ore bursting temperature of pellet ores provided by the invention, red soil nickel ore powder after thin nickel flash smelting sizing processing and after fine grinding is mixed, can make the nickel flash smelting slag after levigate be distributed in the red soil nickel ore powder after fine grinding, the burst temperature that has improved like this red soil nickel ore pelletizing, is conducive to follow-up roasting.
Beneficial effect of the present invention: the nickel flash smelting slag after (1) fine grinding, its wetting ability is far below conventional powdered iron ore, more lower than the red soil nickel ore powder after fine grinding, when therefore red soil nickel ore powder is prepared pelletizing with addition of the nickel flash smelting slag after fine grinding, can significantly improve the burst temperature of red soil nickel ore pelletizing.(2) in nickel flash smelting slag, contain nickel, like this in red soil nickel ore with addition of melting nickel slag, although the nickel content of nickel flash smelting slag lower than red soil nickel ore, the nickel content of its finished ball nodulizing can significantly not reduce.
The present invention is specially adapted to utilize the enterprise of producing pellets from laterite-nickel ore.
Embodiment
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Paper benchmark example, benchmark example is that pellet is manufactured in full red soil nickel ore powder roasting.
benchmark embodiment
The concrete steps that the present embodiment is prepared red soil nickel ore pellet are as follows:
(1) get the raw materials ready:
100 parts of red soil nickel ores;
In red soil nickel ore raw material, chemical composition comprises TFe=35.1%, Ni=1.42%, SiO
2=13.7%, MgO=8.6%, burn out rate is 11.4%.This red soil nickel ore powder is Indonesia's red soil nickel ore.
(2) the levigate processing of red soil nickel ore:
By levigate 100 parts of red soil nickel ores, the ratio that its granularity is less than 0.074mm is 68%.
(3) pelletizing:
By the pelletizing in balling disc of the red soil nickel ore after fine grinding, obtain water ratio and be 18.6%(by weight percentage) pelletizing, median size is 12mm ~ 20mm, the burst temperature of measuring green pellets is 85 DEG C.
(4) roasting:
Red soil nickel ore pelletizing is carried out on roasting apparatus to roasting, obtain finished product red soil nickel ore pellet.
Introduce embodiments of the invention below, embodiment mixes the red soil nickel ore powder after thin nickel flash smelting sizing processing and after fine grinding.
embodiment 1
The red soil nickel ore powder of 87 parts and 13 parts of fine grinding nickel flash smelting slags after treatment are mixed pelletizing by the present embodiment.
The present embodiment manufacture method comprises the following steps:
(1) batching:
Red soil nickel ore, nickel flash smelting slag are prepared burden in following ratio, and concrete proportioning is:
87 parts of red soil nickel ores; 13 parts of nickel flash smelting slags;
Red soil nickel ore material chemical component is identical with benchmark example.
The chemical composition of nickel flash smelting slag is as follows:
NiO:0.54%, TFe:38.8 %, SiO
2: 33.2%, CaO:3.7%, MgO:6.9%, scaling loss 0.4%; This nickel flash smelting slag is Gansu nickel flash smelting slag.
(2) the levigate processing of red soil nickel ore:
By levigate 87 parts of red soil nickel ores, the ratio that its granularity is less than 0.074mm is 68%.
(3) nickel flash smelting sizing is carefully processed:
By thin 13 parts of nickel flash smelting sizing, the ratio that its granularity is less than 0.074mm is 48%, and its molecular water is 1.53%, and its capillary water is greater than 28.89%.
(4) mixed pelletizing:
Above-mentioned preprocessing compound after treatment pelletizing in balling disc, obtains water ratio and is 16.4%(by weight percentage) pelletizing, median size is 12mm ~ 20mm, the burst temperature of measuring green pellets is 165 DEG C.
(5) roasting:
Red soil nickel ore pelletizing is carried out to roasting baking on equipment, obtain finished product red soil nickel ore pellet.
When roasting, sinter process parameter is suitably adjusted according to need of production.
embodiment 2
The red soil nickel ore powder of 80 parts and 20 parts of fine grinding nickel flash smelting slags after treatment are mixed pelletizing by the present embodiment.
The present embodiment manufacture method comprises the following steps:
(1) batching:
Red soil nickel ore, nickel flash smelting slag are prepared burden in following ratio, and concrete proportioning is:
80 parts of red soil nickel ores; 20 parts of nickel flash smelting slags;
Red soil nickel ore material chemical component is identical with benchmark example.Nickel flash smelting slag is identical with embodiment 1.
(2) the levigate processing of red soil nickel ore:
By levigate 80 parts of red soil nickel ores, the ratio that its granularity is less than 0.074mm is 68%.
(3) nickel flash smelting sizing is carefully processed:
By thin 20 parts of nickel flash smelting sizing, the ratio that its granularity is less than 0.074mm is 48%, and its molecular water is 1.53%, and its capillary water is greater than 28.89%.。
(4) mixed pelletizing:
Above-mentioned preprocessing compound after treatment pelletizing in balling disc, obtains water ratio and is 14.8%(by weight percentage) pelletizing, median size is 12mm ~ 20mm, the burst temperature of measuring green pellets is 205 DEG C.
(5) roasting:
Red soil nickel ore pelletizing is carried out to roasting baking on equipment, obtain finished product red soil nickel ore pellet.
When roasting, sinter process parameter is suitably adjusted according to need of production.
embodiment 3
The red soil nickel ore powder of 87 parts and 13 parts of fine grinding nickel flash smelting slags after treatment mix pelletizing by the present embodiment, but further improved the ratio that melting nickel slag particle degree is less than 0.074mm.
The present embodiment manufacture method comprises the following steps:
(1) batching:
Red soil nickel ore, nickel flash smelting slag are prepared burden in following ratio, and concrete proportioning is:
87 parts of red soil nickel ores; 13 parts of nickel flash smelting slags;
Red soil nickel ore material chemical component is identical with benchmark example.Nickel flash smelting slag is identical with embodiment 1.
(2) the levigate processing of red soil nickel ore:
By levigate 87 parts of red soil nickel ores, the ratio that its granularity is less than 0.074mm is 68%.
(3) nickel flash smelting sizing is carefully processed:
By thin 13 parts of nickel flash smelting sizing, the ratio that its granularity is less than 0.074mm is 65%, and its molecular water is 1.82%, and its capillary water is greater than 26.67%.。
(4) mixed pelletizing:
Above-mentioned preprocessing compound after treatment pelletizing in balling disc, obtains water ratio and is 16.7%(by weight percentage) pelletizing, median size is 12mm ~ 20mm, the burst temperature of measuring green pellets is 185 DEG C.
(5) roasting:
Red soil nickel ore pelletizing is carried out to roasting baking on equipment, obtain finished product red soil nickel ore pellet.
When roasting, sinter process parameter is suitably adjusted according to need of production.
Described in above-described embodiment 1 part is 100kg.
Contrast embodiments of the invention 1 and can find out with benchmark example, after the nickel flash smelting slag after 13 parts of fine grindings of adapted, the burst temperature of green pellets is by 85 DEG C high to 165 DEG C, and the quality of green pellets is improved; Contrast embodiments of the invention 2 and embodiment 1, further improve the nickel flash smelting slag umber after fine grinding, nickel flash smelting slag after namely 20 parts of fine grindings of adapted, the burst temperature of green pellets is further brought up to again 205 DEG C, and the quality of green pellets is further enhanced; Contrast embodiments of the invention 3 and embodiment 1, nickel flash smelting slag adapted is still 13 parts, but by it again further after fine grinding, after the ratio that its granularity is less than 0.074mm brings up to 65% by 48%, the burst temperature of green pellets is also brought up to 185 DEG C by 165 DEG C, and the quality of green pellets is further enhanced.
Claims (3)
1. one kind is improved the method for red soil nickel ore bursting temperature of pellet ores, comprise and adopt red soil nickel ore pelletizing, roasting, it is characterized in that: in red soil nickel ore, add nickel flash smelting slag, first red soil nickel ore, nickel flash smelting slag are carried out to fine grinding pre-treatment, and then batch mixing, pelletizing, roasting, produce red soil nickel ore pellet, the burst temperature of red soil nickel ore pellet is more than 150 DEG C.
2. the method for raising red soil nickel ore bursting temperature of pellet ores according to claim 1, is characterized in that: comprise the following steps:
(1) batching:
Red soil nickel ore, nickel flash smelting slag are prepared burden in following ratio, and concrete proportioning is:
75 ~ 90 parts of red soil nickel ores;
10 ~ 25 parts of nickel flash smelting slags;
(2) the levigate fine grinding of red soil nickel ore:
Red soil nickel ore is levigate, and its granularity is less than the ratio of 0.074mm between 65 ~ 85%;
(3) nickel flash smelting slag fine grinding:
By thin nickel flash smelting sizing, its granularity is less than the ratio of 0.074mm between 45 ~ 75%, and its molecular water is less than 2%, and its capillary water is greater than 25%;
(4) batch mixing, pelletizing:
Above-mentioned preprocessing compound after treatment pelletizing in balling disc, the particle diameter of its pellet is 12mm ~ 20mm;
(5) roasting:
Red soil nickel ore pelletizing is carried out to roasting baking on equipment, obtain finished product red soil nickel ore pellet.
3. the method for raising red soil nickel ore bursting temperature of pellet ores according to claim 2, is characterized in that: the component of described nickel flash smelting slag is: NiO:0.4-1%, TFe:34%-40%, SiO
2: 30-35%, CaO:2-5%, MgO:4-8%, burn out rate 0.3-0.6%.
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| CN201410129299.0A CN103882223B (en) | 2014-04-02 | 2014-04-02 | A kind of method improving red soil nickel ore bursting temperature of pellet ores |
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| CN201410129299.0A CN103882223B (en) | 2014-04-02 | 2014-04-02 | A kind of method improving red soil nickel ore bursting temperature of pellet ores |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458795A (en) * | 2014-12-01 | 2015-03-25 | 武钢集团昆明钢铁股份有限公司 | Method for rapidly and accurately measuring cracking temperature of green pellets |
| CN107338355A (en) * | 2017-07-25 | 2017-11-10 | 淮北益嘉益新材料科技有限公司 | A kind of method for improving smelting iron and steel bursting temperature of pellet ores |
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| CN103114198A (en) * | 2013-01-15 | 2013-05-22 | 山西太钢不锈钢股份有限公司 | Method for utilizing nickel flash smelting water-quenched slag |
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Patent Citations (7)
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| JPS63153226A (en) * | 1986-12-15 | 1988-06-25 | Nkk Corp | Manufacture of agglomerate |
| CN101311286A (en) * | 2007-05-24 | 2008-11-26 | 万天骥 | Process for producing nickel iron from low catarinite |
| AU2008237569A1 (en) * | 2008-02-02 | 2009-08-20 | Sino-Platinum Metals Co. Ltd. | A process for concentration of nickel and joint production of iron red from nickel laterite |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458795A (en) * | 2014-12-01 | 2015-03-25 | 武钢集团昆明钢铁股份有限公司 | Method for rapidly and accurately measuring cracking temperature of green pellets |
| CN107338355A (en) * | 2017-07-25 | 2017-11-10 | 淮北益嘉益新材料科技有限公司 | A kind of method for improving smelting iron and steel bursting temperature of pellet ores |
| CN107338355B (en) * | 2017-07-25 | 2019-01-04 | 唐山东海钢铁集团有限公司 | A method of improving smelting iron and steel bursting temperature of pellet ores |
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| CN103882223B (en) | 2016-03-30 |
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