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Process for producing granulated iron by directly reducing low-grade complex difficultly-processed ore

A low-grade, difficult-to-handle technology, applied in furnaces, furnace types, fluidized bed furnaces, etc., can solve problems such as low recovery rate, high cost, and pollute the environment, and achieve the effect of improving efficiency, quality and recovery rate

Inactive Publication Date: 2011-10-12
TANGSHAN OUTSTANDING SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity and difficulty of separation, metals cannot or can only be partially selected by conventional beneficiation technology.
At home and abroad, direct reduction technology is also used to make complex refractory ore into reduced iron, but both have the disadvantages of low recovery rate, large investment and high cost.
In the extraction and reduction treatment of non-ferrous metal ore and non-ferrous metal waste, such as laterite nickel ore, there are two processes of wet smelting and pyrometallurgy, which also have the disadvantages of low recovery rate, large investment, high cost, and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Raw material ingredients: low-grade complex and refractory ore is laterite nickel ore powder (Fe=17.52%, Ni=1.52%), reducing agent (carbon C) processed from anthracite, coke powder or bituminous coal, the particle size after crushing is 50-100 mesh , the desulfurization agent is limestone, and the alkalinity regulator is added to adjust the alkalinity of the material to 0.2-0.7, and the laterite nickel ore powder is mixed with the reducing agent (carbon C), desulfurizer (limestone) and metal aggregating agent in proportion (laterite nickel ore powder 1 : reducing agent 0.1-0.3: desulfurizing agent 0.086-0.21: metal aggregating agent 0.0016-0.009) mixed, the material is spread on the trolley surface and enters the reduction equipment (bottom furnace), and the temperature is raised to 1200-1400 ℃ for 2-3 hours. The product is quenched and selected by kiln water, and the obtained ferronickel product is tested by TFe=51.45%, Ni=15.7%, and the recovery rate of nickel is over ...

Embodiment 2

[0017] Raw material ingredients: low-grade complex refractory ore is oolitic hematite (Fe=34%) with a particle size of 0-3mm, and the reducing agent (carbon C) processed from anthracite, coke powder or bituminous coal has a particle size of 50-100 after crushing The desulfurizer is limestone, and the alkalinity of the material is adjusted to 0.32~0.58. The oolitic hematite is mixed with the reducing agent (carbon C), desulfurizer (limestone) and additive metal aggregation agent in proportion (oolitic hematite 1: Reductant 0.20~0.47: desulfurizer 0.12~0.27: metal aggregating agent 0.0016~0.0039) fully mixed and spread on the trolley surface, enter the reduction equipment (bottom furnace), heat up to 1100~1300°C for 2~4 hours, The product is quenched and selected by kiln water, and the TFe of the sponge iron product reaches more than 87%, and the Fe recovery rate reaches more than 95%.

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Abstract

The invention relates to a process for producing granulated iron by directly reducing low-grade complex difficultly-processed ore, in particular to a process for producing granulated iron by rapidly directly reducing clay nickel ore, oolitic hematite, antelope quarries, vanadium titanomagnetite, hematite, specularite, limonite, siderite and the like. The technical scheme is as follows: the low-grade complex difficultly-processed ore is sufficiently mixed with a reducing agent, a desulfurizing agent and a metal gathered agent; an alkalinity regulator is added; the basicity range of the material is controlled within 0.2-0.8; and the mixed carbon-containing material enters reducing equipment so as to be heated and reduced. The alkalinity regulator is added to the low-grade complex difficultly-processed ore so that non-iron oxides are rapidly gathered and quit metal elements so as to form slag. On the other hand, the metal gathered agent is added so that the metal elements in an oxidation state are gathered more rapidly and quit the slag so as to form fine particles when the metal elements are reduced from the oxidation state to a metal state. The efficiency of the subsequent ore-grinding magnetic separation process can be increased through the granulated material. The grade and the recovery rate of the product can be increased.

Description

technical field [0001] The present invention relates to a process for direct reduction of low-grade complex refractory ores to produce granular iron, especially for laterite nickel ore, oolitic hematite, antelope ore, vanadium-titanium magnetite, hematite, specularite, The process of rapid and direct reduction of low-grade complex refractory ores such as limonite and siderite and non-ferrous metal oxide slag to produce granular iron. Background technique [0002] With the rapid development of the world economy, the demand for stainless steel, which accounts for 65% of nickel use, is growing strongly, but the traditional nickel sulfide ore resources for extracting metallic nickel cannot meet the demand, which forces people to start from laterite nickel ore, which accounts for 58% of the earth's nickel resources. Extract metallic nickel. The process of extracting metal nickel from laterite nickel ore includes wet process and fire process. The wet process is the pressure acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00
Inventor 汪翔宇王建春汪寿平
Owner TANGSHAN OUTSTANDING SCI & TECH
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