CN104694754A - Method for adjusting smelted lateritic ore slag of submerged-arc furnace - Google Patents
Method for adjusting smelted lateritic ore slag of submerged-arc furnace Download PDFInfo
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- CN104694754A CN104694754A CN201510114738.5A CN201510114738A CN104694754A CN 104694754 A CN104694754 A CN 104694754A CN 201510114738 A CN201510114738 A CN 201510114738A CN 104694754 A CN104694754 A CN 104694754A
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Abstract
The invention belongs to the technical field of producing ferronickel from smelted lateritic ore slag of a submerged-arc furnace and specifically relates to a method for adjusting the smelted lateritic ore slag of the submerged-arc furnace. The major technical problems to be solved are high cost, unsmooth smelting process and high power consumption of the existing methods. The scheme for solving the technical problems is to provide the method for adjusting the smelted lateritic ore slag of the submerged-arc furnace; the method comprises the steps of 1, deducing the components of the slag before adjustment according to the components of the lateritic nickel ore raw material, selecting the temperature of the slag after adjustment according to smelting conditions and calculating the silicon-to-magnesium ratio of the slag after adjustment according to the temperature of the slag after adjustment, 2, calculating the volume of addition of sea sand according to the silicon-to-magnesium ratio of the slag after adjustment in combination with the components of the slag before adjustment and the sea sand, 3, mixing the sea sand with the lateritic nickel ores according to the volume of addition of the sea sand, and calcining, and 4, smelting and separating to obtain a ferronickel alloy and the adjusted slag. The method is simple and convenient to operate; the economic benefit can be increased.
Description
Technical field
The invention belongs to mine heat furnace smelting laterite and produce ferronickel technical field, be specifically related to the method adjusting mine heat furnace smelting laterite slag.
Background technology
Nickel is the important alloying element producing austenitic stainless steel, the consumption of nickel in stainless steel industry accounts for 80% of total quantity consumed, along with the increase of China's stainless steel output, also increase year by year the demand of nickel, current smelting stainless steel nickel-bearing raw material used mainly contains sheet nickel and Rhometal.
The ferronickel of domestic production accounts for about 65% of nickel supply, China ferronickel produce mainly with import Indonesia or Filipine red soil nickel ore for raw material, adopt electric furnace or blast furnace technology to produce.RKEF technique is the method that the most ripe a kind of smelting red clay nickel ore produces ferronickel, and rational slag type has important impact to smelting direct motion.A lot of enterprise smelts laterite employing without calcium slag system at present, by silicon magnesium ratio (SiO in adjustment slag
2/ MgO) adjust slag melting.Along with Indonesia prohibit ore deposit order coming into force, a large amount of import Philippines of domestic ferronickel factory red soil nickel ore, and Philippines's laterite Problems existing be silicon magnesium than on the low side, cause slag melting to raise, cause smelting process to have some setbacks, power consumption raise, cost increase, economic benefit reduction.
In sum, need badly a kind of cost of exploitation lower, simply, adjust the method for mine heat furnace smelting laterite slag flexibly.
Summary of the invention
The technical problem to be solved in the present invention is that the method cost of existing adjustment mine heat furnace smelting laterite slag is higher, smelting process has some setbacks, power consumption is high.
The scheme that the present invention solves the problems of the technologies described above be to provide a kind of cost lower, simply, adjust the method for mine heat furnace smelting laterite slag flexibly, thus ensure to smelt direct motion, power consumption reduces, and economic benefit increases.
The method of above-mentioned adjustment mine heat furnace smelting laterite slag, comprises the following steps:
Step one: the composition of inferring the front slag of adjustment according to the composition of red soil nickel ore raw material; According to smelting condition, select the temperature of the rear slag of adjustment; According to the temperature of slag after adjustment, calculate the silicon magnesium ratio of the rear slag of adjustment;
Step 2: according to the silicon magnesium ratio of whole rear slag, in conjunction with the composition of slag and sea sand before adjustment, calculates the addition of sea sand;
Step 3: according to the addition of the sea sand of step 2, after sea sand and red soil nickel ore mixing, roasting in rotary kiln;
Step 4: smelt in the calcine trans-portation after roasting to mineral hot furnace, realizes slag gold and is separated, obtain the slag after Rhometal and adjustment.
Wherein, in the method for above-mentioned adjustment mine heat furnace smelting laterite slag, after adjustment described in step one, the span of control of slag temperature is 1550 DEG C ~ 1560 DEG C.
Wherein, in the method for above-mentioned adjustment mine heat furnace smelting laterite slag, the sea sand described in step 2, its SiO
2content is 92 ~ 96%.
The method of adjustment mine heat furnace smelting laterite slag provided by the invention, cost is lower, simple to operate, flexible, can ensure to smelt direct motion, and can not affect the quality of smelting Rhometal, reduces power consumption, increases economic benefit.
Embodiment
The method of adjustment mine heat furnace smelting laterite slag, comprises the following steps:
Step one: the composition of inferring the front slag of adjustment according to the composition of red soil nickel ore raw material; According to smelting condition, select the temperature of the rear slag of adjustment; According to the temperature of slag after adjustment, calculate the silicon magnesium ratio of the rear slag of adjustment;
Step 2: according to the silicon magnesium ratio of whole rear slag, in conjunction with the composition of slag and sea sand before adjustment, calculates the addition of sea sand;
Step 3: according to the addition of the sea sand of step 2, after sea sand and red soil nickel ore mixing, roasting in rotary kiln;
Step 4: smelt in the calcine trans-portation after roasting to mineral hot furnace, realizes slag gold and is separated, obtain the slag after Rhometal and adjustment.
Wherein, in the method for above-mentioned adjustment mine heat furnace smelting laterite slag, after selecting adjustment described in step one, slag temperature wherein, and in the method for above-mentioned adjustment mine heat furnace smelting laterite slag, after adjustment described in step one, the span of control of slag temperature is 1550 DEG C ~ 1560 DEG C.
Wherein, in the method for above-mentioned adjustment mine heat furnace smelting laterite slag, described in step one according to the method for slag silicon magnesium ratio after the temperature computation adjustment of slag after adjustment be: use thermodynamic software to calculate slag composition corresponding to target temperature, thus try to achieve silicon magnesium ratio in slag.
Wherein, in the method for above-mentioned adjustment mine heat furnace smelting laterite slag, the sea sand described in step 2, its SiO
2content is 92 ~ 96%.
Embodiment 1
Shown in table 1 is slag composition before adjustment, and now before adjustment, the theoretical fusing point of slag is 1534 DEG C, and before the adjustment of actual measurement when slagging tap, slag temperature is 1577 DEG C.
Slag composition (%) before table 1 adjusts
| Composition | FeO | SiO 2 | CaO | MgO | Al 2O 3 | Cr 2O 3 | SiO 2/MgO |
| Content | 9.95 | 52.40 | 0.96 | 30.94 | 4.42 | 1.24 | 1.69 |
According to smelting condition, need the temperature of slag before above-mentioned adjustment to reduce by 20 DEG C, then the silicon magnesium ratio being adjusted rear slag by the theoretical fusing point calculating of slag should be 1.8.
Shown in table 2 be the sea sand of interpolation 2% time, smelt slag composition after the adjustment that obtains, now after adjustment, the theoretical fusing point of slag is 1517 DEG C, and the slag temperature of actual measurement when slagging tap is 1564 DEG C.
Slag composition (%) after table 2 adjusts
| Composition | FeO | SiO 2 | CaO | MgO | Al 2O 3 | Cr 2O 3 | SiO 2/MgO |
| Content | 9.68 | 53.71 | 0.93 | 30.09 | 4.30 | 1.20 | 1.78 |
The theoretical fusing point of slag, by the sea sand of interpolation 2%, is reduced 17 DEG C by the present embodiment, and the actual temperature measured of slagging tap reduces 13 DEG C.
Embodiment 2
Adopt the raw material identical with embodiment 1, after adding the sea sand of 4%, after the adjustment obtained, the composition of slag is as shown in table 3.Now after adjustment, the theoretical fusing point of slag is 1504 DEG C, and after the adjustment of actual measurement when slagging tap, slag temperature is 1554 DEG C.
Slag composition (%) after table 3 adjusts
| Composition | FeO | SiO 2 | CaO | MgO | Al 2O 3 | Cr 2O 3 | SiO 2/MgO |
| Content | 9.42 | 54.95 | 0.91 | 29.28 | 4.18 | 1.17 | 1.88 |
Contrast the sea sand of interpolation 4% and do not add the smelting result of sea sand, after adjustment, the theoretical fusing point of slag reduces 30 DEG C, and the actual temperature measured of slagging tap reduces 23 DEG C.
Meanwhile, after sea sand, the direct motion more of electrosmelting process, furnace is more reasonable, and the melting electric consumption of ton metallic nickel reduces.
Claims (3)
1. adjust the method for mine heat furnace smelting laterite slag, comprise the following steps:
Step one: the composition of inferring the front slag of adjustment according to the composition of red soil nickel ore raw material; According to smelting condition, select the temperature of the rear slag of adjustment; According to the temperature of slag after adjustment, calculate the silicon magnesium ratio of the rear slag of adjustment;
Step 2: according to the silicon magnesium ratio of whole rear slag, in conjunction with the composition of slag and sea sand before adjustment, calculates the addition of sea sand;
Step 3: according to the addition of the sea sand of step 2, after sea sand and red soil nickel ore mixing, roasting in rotary kiln;
Step 4: smelt in the calcine trans-portation after roasting to mineral hot furnace, realizes slag gold and is separated, obtain the slag after Rhometal and adjustment.
2. the method for adjustment mine heat furnace smelting laterite slag according to claim 1, is characterized in that: after adjustment described in step one, the span of control of slag temperature is 1550 ~ 1560 DEG C.
3. the method for adjustment mine heat furnace smelting laterite slag according to claim 1, is characterized in that: the sea sand described in step 2, its SiO
2content is 92 ~ 96%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114738.5A CN104694754A (en) | 2015-03-16 | 2015-03-16 | Method for adjusting smelted lateritic ore slag of submerged-arc furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114738.5A CN104694754A (en) | 2015-03-16 | 2015-03-16 | Method for adjusting smelted lateritic ore slag of submerged-arc furnace |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967157A (en) * | 2012-11-26 | 2013-03-13 | 罕王实业集团有限公司 | Energy-saving and environment-friendly automatic control system for flux burdening of vertical laterite-nickel ore smelting furnace |
| CN202973836U (en) * | 2012-05-25 | 2013-06-05 | 李宾 | Rotary kiln for producing ferronickel from Indonesia Sulawesi nickel laterite ore through RKEF (rotary kiln-electric furnace) technical processing |
| CN103589939A (en) * | 2013-11-07 | 2014-02-19 | 昆明理工大学 | Method for smelting ferro-nickel through smelting reduction of laterite-nickel ore |
| WO2014133421A1 (en) * | 2014-04-02 | 2014-09-04 | Общество С Ограниченной Ответственностью "Ви Холдинг" | Method for processing laterite nickel ore with direct production of ferronickel |
-
2015
- 2015-03-16 CN CN201510114738.5A patent/CN104694754A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202973836U (en) * | 2012-05-25 | 2013-06-05 | 李宾 | Rotary kiln for producing ferronickel from Indonesia Sulawesi nickel laterite ore through RKEF (rotary kiln-electric furnace) technical processing |
| CN102967157A (en) * | 2012-11-26 | 2013-03-13 | 罕王实业集团有限公司 | Energy-saving and environment-friendly automatic control system for flux burdening of vertical laterite-nickel ore smelting furnace |
| CN103589939A (en) * | 2013-11-07 | 2014-02-19 | 昆明理工大学 | Method for smelting ferro-nickel through smelting reduction of laterite-nickel ore |
| WO2014133421A1 (en) * | 2014-04-02 | 2014-09-04 | Общество С Ограниченной Ответственностью "Ви Холдинг" | Method for processing laterite nickel ore with direct production of ferronickel |
Non-Patent Citations (1)
| Title |
|---|
| 卢红波: "红土镍矿电炉还原炼镍铁合金的研究进展", 《矿冶》 * |
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