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Recycling method of ferronickel slag

A technology of ferronickel slag and slag, which is applied in the field of slag recycling and regeneration, can solve problems such as loss of strength, easy pulverization, and instability, and achieve the effects of eliminating environmental impact, reducing reaction temperature, and simplifying the process

Active Publication Date: 2013-03-13
NINGBO WANXIANG HLDG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Laterite nickel ore can use blast furnace (small blast furnace) process, sintering agglomerate-electric furnace smelting nickel-iron process, RKEF (rotary kiln-submerged arc furnace) process, etc. to produce nickel-iron required for stainless steel, but no matter what kind of process, in use In the process of producing ferronickel from laterite ore, a large amount of slag will be produced. At present, slag is mainly used in roads, cement production and insulation materials, but due to the high content of magnesium in laterite ore (15-35%, calculated as magnesium oxide ), resulting in only a small amount of addition (generally less than 20%) in cement production. Most of the slag produced by it is nickel-iron slag after water quenching. The instability of pulverization also limits the use of road construction and replacement of sand and gravel as building materials
[0003] The amount of slag produced in ferronickel production is very large. The production of 1 ton of ferronickel will produce about 6 tons of slag. Based on the 4.1 million tons of ferronickel supplied by my country in 2007, a total of about 24.6 million tons of slag will be produced. Such a huge amount of slag will not only occupy a huge The dumping site will increase the economic burden of the enterprise, and will also bring unbearable serious consequences to the environment.

Method used

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  • Recycling method of ferronickel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In a 1000ml three-necked flask equipped with a thermometer, a stirrer, and an ammonia absorption device, add 400 grams of ammonium sulfate, 3 grams of powdered porous aluminum hydroxide, and 80 grams of water, heat up, start stirring, and the reaction temperature gradually rises to 220 ° C. Keep warm After 4 hours, it was cooled and tested by sampling, and the content of ammonium bisulfate was 99.03%.

[0051] Example 2:

[0052] Take 200g of ferronickel slag, after testing, the slag composition: magnesium (calculated as magnesium oxide): 23.00%; silicon (calculated as SiO 2 Nickel: 0.23%; Iron: 5.03%; crushed into more than 100 mesh, added to a 1000ml four-necked flask equipped with a thermometer, agitator, and ammonia absorption, added 500g of water, heated to 50°C, and batched Add 300g of ammonium bisulfate synthesized in Example 1, react for 6 hours, filter, and wash the solid phase with 200g of water for three times. The solid phase filter residue magnesium con...

Embodiment 3

[0054] Get the mother liquor of example two, get the same slag of example two, be ground into more than 200 orders, get 200 grams and add 1000ml and thermometer, stirrer are equipped with, in the four-necked flask of ammonia absorption, limit heat up, add the ammonium bisulfate of example one limit 200g, rise to 80°C within one hour, keep warm for 4 hours and filter, wash the solid phase with 200g of water three times, the solid phase filter residue has a magnesium content of 2.5% and a nickel content of 0.012%. The filter residue is used for cement production, and the filtrate is used for later use.

Embodiment 4

[0056] Take 500g of the mother liquor of Example 3, repeat the test of Example 3, take the mother liquor, concentrate and evaporate, cool to 20°C, crystallize and precipitate green crystals, filter, wash with water, and obtain 310g of crystals, the mother liquor can be used for reaction, or directly after mixing with laterite ore , as raw material ore for ferronickel production.

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Abstract

The invention relates to a recycling method of slag generated in the production of ferronickel from laterite ore, belonging to the technical field of smelting cleaning production. The method forms a complete recycling process by three main chemical reactions so as to economically, reasonably and comprehensively utilize the slag, and comprises: preparing ammonium bisulfate and ammonia gas through a thermal decomposition of ammonium sulfate, reacting the ammonium bisulfate and the slag to generate the ammonia gas and soluble sulfate salt such as nickel sulfate, magnesium sulfate, etc., and reacting the above ammonia gas and the magnesium sulfate to generate the ammonium sulfate and hydroxide, wherein the ammonium sulfate is repeatedly used in the thermal decomposition. The method effectively utilizes the slag, uses a clean production technology, eliminates influence of the slag on the environment, and basically does not generate "three wastes (waste gas,waste water and industrial residue)" during the recycling process.

Description

technical field [0001] The invention relates to a method for recycling slag produced when laterite ore is used to produce ferronickel, and belongs to the technical field of smelting clean production. Background technique [0002] Nickel-containing ores can be mainly divided into copper-nickel sulfide ore and laterite nickel ore, of which copper-nickel sulfide ore accounts for about 42% of nickel, and the rest is laterite nickel. Due to the obvious reduction of nickel sulfide resources available for development, the increase in world nickel production in the next ten years will mainly come from the mining of lateritic nickel resources. Laterite nickel ore can use blast furnace (small blast furnace) process, sintering agglomerate-electric furnace smelting nickel-iron process, RKEF (rotary kiln-submerged arc furnace) process, etc. to produce nickel-iron required for stainless steel, but no matter what kind of process, in use In the process of producing ferronickel from later...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 胡根良
Owner NINGBO WANXIANG HLDG GRP CO LTD
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