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

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

Active Publication Date: 2009-12-16
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

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Effect test

Embodiment 1

[0064] This embodiment uses the figure 2 The new small shaft furnace described, the furnace capacity of the new shaft furnace test furnace of this embodiment is 4m 3 , about 1m in diameter, 4m in height, one tap outlet 9, one air outlet 6, no sealing facilities for charging, gravity dust collector, no fine dust removal facilities, and a set of heat exchanger 21 built with refractory materials, see the structure image 3 . Manual feeding, manual weighing. Hot air temperature: 530~660℃, the furnace body is sprayed and cooled. A small cast iron trolley and eight molds are set in front of the furnace, which can cast about 300kg of cast iron at a time. The hole diameter of the tap hole 9 is 20mm. The slag outlet 8 has no cooling jacket.

[0065] The steps of this embodiment are as follows:

[0066] (1) Mixing

[0067] The mass ratio of the raw materials constituting the laterite ore mixture is:

[0068] Laterite 78.5 Cement 10 Bentonite 1.5 In addition, the mixture maintai...

Embodiment 2

[0099] The difference between this embodiment and the first embodiment has three points: the raw materials used during the step (1) mixing are different, add pulverized coal in the mixing, and mix the materials according to the following proportions

[0100] (1) Mixing

[0101] The mass ratio of the raw materials constituting the laterite ore mixture is:

[0102] Laterite 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 with less than 200 mesh accounting for more than 60%. After the materials are mixed according to the above mass fraction, they are put into the mixer and mixed evenly.

[0105] In addition, the composition of the molten iron in step (5) is different from that of Embodiment 1, 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%

[...

Embodiment 3

[0113] The main difference between this embodiment and the first embodiment is that the raw materials used in (1) mixing are different. In this embodiment, stainless steel dust is also added to the laterite mixture, and the laterite mixture is prepared according to the following mass fractions Ratio mix:

[0114] Laterite 40 Stainless Steel Dust 39 Cement 11

[0115] Bentonite 1.5 The water distribution is 8 parts.

[0116] All the raw materials required for the above-mentioned briquetting are processed into powder with less than 200 mesh accounting for more than 60%. After the materials are mixed according to the above mass fraction, they are put into the mixer and mixed evenly.

[0117] The mass percentage of the composition of the briquetting 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

...

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Abstract

The 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 a small-sized blast furnace or a novel 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 ups and downs of nickel prices in the past 20 years have been 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 ore and laterite ore (oxidized ore). Due to the depletion of sulfide ore, the smelting of nickel-containing molten iron with laterite ore has been paid attention to 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. The smelting process of oxide ore includes electric furnace method, high pressure acid leaching method and small blast furnace method. The wet method is not widely used in China due to problems suc...

Claims

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Application Information

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Patent Type & Authority Applications(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
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