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Method for smelting nickel-containing molten iron by use of laterite ore

A technology for laterite ore and nickel molten iron, which is applied in the field of laterite ore smelting nickel-containing molten iron, can solve the problems of lack of competitiveness, loss of competitiveness, and high power consumption of electric furnace method, so as to avoid dust, overcome poor feeding, reduce cost effect

Active Publication Date: 2011-07-20
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the problems of environmental pollution and recovery rate, the wet method is rarely used in China. The electric furnace method in the fire method consumes too much power (25 thousand kwh / ton), and its competitiveness is insufficient (2.6U$ / lb); sintering 1. Although the cost of the small blast furnace method is low, it has lost its competitiveness due to the phase-out due to the restrictions of the national environmental protection policy. In this way, the sintering process is canceled and the development and research work of cold-solidified agglomerate and special shaft furnace process is used

Method used

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  • Method for smelting nickel-containing molten iron by use of laterite ore
  • Method for smelting nickel-containing molten iron by use of laterite ore
  • Method for smelting nickel-containing molten iron by use of laterite ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] (1) Mixing

[0069] The mass portion proportioning of the raw material that forms laterite mixture is:

[0070] Laterite ore 78.5 cement 10 bentonite 1.5 other mixtures maintain 10 parts of water;

[0071] At the same time, all raw materials are processed into powders with a mesh size of less than 200, accounting for more than 60%.

[0072] Wherein the mass percentage of the main component of laterite ore is:

[0073] Fe 2 o 3 : 62.3FeO: 0.29SiO 2 : 7.71AI 2 o 3 : 7.67CaO: 0.54MgO: 2.71P: 0.007S: 0.110Ni: 1.08MnO: 0.83H 2 O: 16

[0074] All the above-mentioned raw materials are processed into powders with a mesh size of 200 or less, accounting for more than 60%. After the above-mentioned mass parts are prepared, the mixture is loaded into a mixer and mixed evenly.

[0075] (two) pressure group

[0076] Put the mixed material into a ball press machine to press the laterite mixed material into pressed balls, the particle size of the pressed balls is 3mm×2.5mm×3...

Embodiment 2

[0101] The mass portion proportioning of the raw material that forms laterite mixture is:

[0102] Laterite ore 69 cement 10 bentonite 1 pulverized coal 10

[0103] In addition, the mixture maintains 10 parts of water;

[0104] All the above-mentioned raw materials are processed into powders of less than 200 meshes, accounting for more than 60%. After the above-mentioned mass parts are prepared, the mixture is loaded into a mixer and mixed evenly.

[0105] In addition, the composition of molten iron in step (five) is different from that of embodiment one, and the composition mass percentage of the nickel-containing molten iron of the present embodiment is:

[0106] C: 4.5% Si: 0.85% Mn: 1.30% Ni: 2.15%

[0107] P: 0.051% S: 0.180% The remainder is Fe and unavoidable impurities.

[0108] Other batching and processing step are identical with embodiment one.

[0109] The nickel recovery rate is 98.2%.

[0110] The 3rd difference is that present embodiment owing to added coa...

Embodiment 3

[0115] Bentonite 1.5 water distribution is 8 parts.

[0116] The raw materials required for the above-mentioned pressure balls are all processed into powders with a mesh size of 200 or less, accounting for more than 60%. After the above-mentioned mass parts are prepared, the mixture is loaded into a mixer and mixed evenly.

[0117] The mass percent of the composition of the pressure ball is shown in Table 2

[0118] Table 2

[0119] Fe 2 o 3

FeO

SiO 2

AI 2 o 3

CaO

MgO

P

Cr 2 o 3

NiO

C

46.88

6.09

6.57

3.0

8.21

2.99

0.024

10.38

2.59

8.0

[0120] The rest are unavoidable impurities

[0121] (2) The step and process of pressing the ball are the same as in Example 1.

[0122] (3) Ingredients

[0123] When entering the shaft furnace, the mass fraction composition of each batch of charge is:

[0124] Pressure ball: 100kg Slag steel: 11kg Coke: 63kg

[0125] ...

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Abstract

The present invention provides a method for smelting nickel-containing molten iron by use of laterite ore. The method sequentially comprises the following: (1) a step of mixing materials, which is to mix laterite ore, bentonite and flux as main raw materials well with water; (2) a step of briquetting, which is to put mixture into a briquetting machine for briquetting and then dry or maintain briquettes to prescriptive strength; (3) a step of proportioning, which is to add coke to the dried or maintained briquettes; (4) a step of smelting, which is to feed and smelt the proportioned raw materials in as mall-sized blast furnace or a shaft furnace with an iron port and a blast tuyere from a furnace mouth; and (5) a step of discharging molten iron, which is to send the smelted nickel-containing molten iron to steel works or cast iron ingots into the nickel-containing molten iron. The method for smelting nickel-containing molten iron by use of laterite ore has the advantages of lower production cost for smelting nickel-containing molten iron and less environmental pollution.

Description

technical field [0001] The invention relates to a method for smelting nickel-containing molten iron with laterite ore. Background technique [0002] The fluctuating nickel price over the past 20 years is the main factor causing the instability of the profitability of the stainless steel industry. Obtaining cheap nickel resources is one of the goals pursued by stainless steel enterprises. Nickel-containing ores mainly include sulfide ores and laterite ores (oxidized ores). Due to the depletion of sulfide ores, the use of laterite ores to smelt nickel-containing molten iron has been valued by the metallurgical industry. At present, the process of smelting nickel-containing molten iron with laterite ore is mainly divided into two types: fire method and wet method. Oxidized ore smelting processes include electric furnace method, high pressure acid leaching method and small blast furnace method. Due to the problems of environmental pollution and recovery rate, the wet method is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/08
Inventor 刘复兴高祥明张华薜丹宏郭东范建军罗胜
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD