CN101704530B - Method for producing ferrous metasilicate by purification and impurity removal of nickel smelting waste slag - Google Patents
Method for producing ferrous metasilicate by purification and impurity removal of nickel smelting waste slag Download PDFInfo
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- CN101704530B CN101704530B CN2009101172269A CN200910117226A CN101704530B CN 101704530 B CN101704530 B CN 101704530B CN 2009101172269 A CN2009101172269 A CN 2009101172269A CN 200910117226 A CN200910117226 A CN 200910117226A CN 101704530 B CN101704530 B CN 101704530B
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- slag
- nickel
- smelting waste
- ferrous metasilicate
- impurity removal
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Abstract
The invention relates to a technique for comprehensively utilizing waste slag generated in nonferrous metallurgy, a technique for comprehensively utilizing the purification and impurity removal of nickel smelting waste slag, in particular to a method for producing ferrous metasilicate by the purification and impurity removal of the nickel smelting waste slag, which can produce ferrous metasilicate products by purifying and impurity-removing the nickel smelting waste slag in the state of high-temperature thermal fluid. The method comprises the steps of: a, heating nickel slag until the nickel slag is melted or directly taking melted nickel slag; b, performing thermal insulation to make the nickel slag remain in a molten state, and simultaneously aerating oxygen or air into the nickel slag for a reaction to generate solid slag; and c, removing the solid slag, and removing bottom slag, of which the weight is 4 to 6 percent of the total weight of the slag, on a heavy metallic layer to obtain a finished product. The method has the advantages of energy conservation, environmental protection and low cost, and can produce the ferrous metasilicate products by purifying and impurity-removing the nickel smelting waste slag in the state of thermal fluid, namely at the temperature of between 1,150 and 1,300 DEG C.
Description
Technical field
The present invention relates to a kind of comprehensive utilization technique of non-ferrous metal metallurgy waste, the comprehensive utilization technique of nickel smelting waste slag particularly, especially relate to a kind of with nickel smelting waste slag promptly 1150 ℃ of high temperature--purification and impurity removal is produced the method with the production ferrous metasilicate of nickel smelting waste slag of ferrous metasilicate product under 1300 ℃ of hydrothermal solution states.
Background technology
The nickel metal is a kind of non-ferrous metal, and extensive use is arranged in national economy, and especially particularly in Iron And Steel Industry, electromechanics, inorganic chemical industry, novel material industry etc. has crucial purposes.The metallurgy industry of pyrogenic process nickel is an important branch of colored metallurgical industrial, is a kind of important non-ferrous raw material industry.In the nickel smelting process, the SiO in the furnace charge
2, CaO, MgO, AL
2O
3, Fe
3O
4Mixture enters electric furnace together, forms liquid slag under 1150 ℃ of-1250 ℃ of high temperature.Slag is the mixed oxide melt based on fayalite, and its major ingredient is a ferrous metasilicate, and the molecular formula of ferrous metasilicate is FeSiO
32FeOSiO
2
Nickel smelting waste slag is a kind of solid slag that pyrogenic process nickel is smelted discharging in the production.Nickel smelting waste slag cooling back is stacked and has been taken a large amount of soils and environment is caused severe contamination.
At present, the nickel smelting waste slag that China has accumulated has about 1,000 ten thousand tons, and still with annual about 1,800,000 tons speed increase, causes the significant wastage of resource and the severe contamination of environment.
Contain Ni, Cu, Fe, Co, S, CaO, MgO, SiO in the nickel smelting waste slag
2Deng, utilize nickel smelting waste slag to reclaim ferrous metal merely, existing both at home and abroad proven technique technology is used for reference, but up to the present, these technical matters are when handling nickel smelting waste slag, the simple ferrous metal that reclaims of main consideration, the common feature of these technology is that energy consumption is excessive, secondary pollution is more serious, comprehensive production cost is higher, economic benefit and environmental benefit are relatively poor, do not have the viability and the capability of sustainable development, therefore, these methods do not have practical value, do not obtain actual promoting the use of so far.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of energy-conserving and environment-protective, low cost are provided, nickel smelting waste slag purification and impurity removal under the hydrothermal solution state can be produced a kind of method of producing ferrous metasilicate with purification and impurity removal of nickel smelting waste slag of ferrous metasilicate product.
The present invention realizes by the following method:
A kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate is characterized in that this treatment process comprises the steps:
A, the nickel slag is heated to molten state or directly gets the nickel slag of molten state;
B, insulation make the nickel slag keep molten state, feed in the nickel slag simultaneously so that react and generate the oxygen or the air of solid residue;
C, remove above-mentioned solid residue, remove the residue that the bottom accounts for the 4%-6% heavy metal layer of slag gross weight, get final product;
Wherein also will be incubated behind step b and make nickel slag maintenance molten state, feed chlorine simultaneously so that react in the nickel slag, the amount of chlorine is a nickel slag 0.1-0.25 cubic meter per ton, and the feeding time of chlorine is 5-10 minute;
Wherein the amount of aerating oxygen is a nickel slag 0.4-1 cubic meter per ton in step b, and the feeding time of oxygen is 5-10 minute;
Wherein the amount of bubbling air is a nickel slag 2-5 cubic meter per ton in step b, and the feeding time of air is 5-10 minute;
Wherein the nickel slag of molten state is meant that temperature is at 1150 ℃-1300 ℃.
The present invention has following effect:
1) processing method uniqueness: the sensible heat when the present invention makes full use of the nickel smelting waste slag discharging carries out electric furnace insulation heating measure to warm sludge earlier, makes warm sludge keep certain temperature, and has good fluidity and chemically reactive; Utilize furnace outer refining technology then, quantitatively warm sludge is carried out purification and impurity removal handles in batches, high pressure oxygen, high pressure chlorine successively are blown into respectively among the warm sludge, detrimental impurity in itself and the warm sludge such as aluminum oxide, magnesium oxide, calcium oxide, sulfide etc. are fully reacted, the reactant proportion that generates is less and float, float on above the warm sludge and separate out, thereby the detrimental impurity in the warm sludge such as aluminum oxide, magnesium oxide, calcium oxide, sulfide etc. are reduced in the specialized range, obtain comparatively purified qualified warm sludge; To become the reaction principle of ferrous metasilicate as follows for ferric oxide in the nickelous sulfide nickel minerals:
FeS+3Fe
3O
4+5SiO
2＝5(2FeO·SiO
2)+SO
2↑
Be difficult to crystallization during the condensation of nickel waste, often become vitreum, softening temperature is low, 1150 ℃-1300 ℃ of softening temperatures.The pyroprocessing of nickel waste is the gordian technique of saving energy and reduce the cost, at high temperature removes impurity, makes the block ferrous metasilicate of ball, and all be the sensible heat that has effectively utilized warm sludge, be state-of-the-art power-saving technology.In this warm sludge treating processes, at first use furnace outer refining technology and remove detrimental impurity in the warm sludge such as aluminum oxide, magnesium oxide, calcium oxide, sulfide etc. and obtain qualified ferrous metasilicate liquation.
2) the present invention adopts advanced person, practicality, reliable metallurgical new technology, the nickel waste of serious environment pollution is turned waste into wealth, fully utilized resource to greatest extent, not only meet national industrial policies, and save energy, reduce and pollute, for energy-saving and emission-reduction, developing a circular economy has great realistic meaning.
3) high-efficiency comprehensive utilization nickel smelting waste slag resource, energy-conserving and environment-protective, low cost: the present invention can make impurity effectively separate with ferrous metasilicate, can realize whole recyclings again to iron protoxide in the nickel smelting waste slag and silicon-dioxide, produce qualified ferrous metasilicate product simultaneously, thus high-efficiency comprehensive utilization the nickel smelting waste slag resource.This method is a kind of energy-conserving and environment-protective, low cost, with the nickel smelting waste slag nickel smelting waste slag method of comprehensive utilization that purification and impurity removal is produced the ferrous metasilicate product under the hydrothermal solution state.
4) the present invention is that Iron And Steel Industry, ferroalloy industry have been opened up a kind of new iron resources, has huge economic benefit and environmental benefit.
5) end-use is extensive: secondly the ferrous metasilicate that method provided by the invention is produced is made into the block ferrous metasilicate of ball; Utilize the melting reduction technique that the block ferrous metasilicate electric stove integral deoxidation and reduction of ball is become the silicon au-alloy again.This ferrous metasilicate ball piece is a kind of metallurgical product innovation, is a kind of metallurgical novel material, is the important novel starting material of producing iron alloy and iron and steel, can be used for the production of ferro-silicon, both can substitute steel cuttings, iron scale, can also substitute silica, but also be a kind of grog.Can save energy and reduce the cost during use, not only can reduce the ferrosilicon production cost significantly, and can reduce emission of carbon-dioxide, have good efficiency of cycling economy and social environment benefit.Novel material when this ferrous metasilicate can also be produced as ferrochrome, ferromanganese can also use as the iron making and sintering furnace charge, have good efficiency of cycling economy and social environment benefit if use by a certain percentage.Therefore this ferrous metasilicate product has good market outlook.This ferro-silicon that utilizes ferrous metasilicate production is one of essential raw material of steel-making, also is one of the raw material that must use of production MAGNESIUM METAL, and existing market has good prospects.
6) rate of recovery height: adopt method provided by the invention to handle nickel smelting waste slag, the ferrous metal rate of recovery reaches 95%.Nickel, copper, the cobalt rate of recovery be 93%, the silicon rate of recovery 92%.
Embodiment
Embodiment one: a kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate, this treatment process comprises the steps: the nickel slag is heated to molten state, insulation makes the nickel slag keep molten state, wherein the nickel slag of molten state is meant that temperature is at 1150 ℃-1300 ℃, in the nickel slag, feed simultaneously so that react and generate the oxygen of solid residue, the amount of aerating oxygen is a nickel slag 0.4-1 cubic meter per ton, the feeding time of oxygen is 5-10 minute, till this solid residue no longer generates, remove above-mentioned solid residue, remove the bottom and account for the residue of the 4%-6% heavy metal layer of slag gross weight, get final product ferrous metasilicate, the molecular formula of ferrous metasilicate is FeSiO
32FeOSiO
2
Embodiment two: a kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate, this treatment process comprises the steps: the nickel slag is heated to molten state, insulation makes the nickel slag keep molten state, wherein the nickel slag of molten state is meant that temperature is at 1150 ℃-1300 ℃, in the nickel slag, feed simultaneously so that react and generate the air of solid residue, the amount of bubbling air is a nickel slag 2-5 cubic meter per ton, the feeding time of air is 5-10 minute, till this solid residue no longer generates, remove above-mentioned solid residue and remove the residue that the bottom accounts for the 4%-6% heavy metal layer of slag gross weight, get final product ferrous metasilicate, the molecular formula of ferrous metasilicate is FeSiO
32FeOSiO
2
Embodiment three: a kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate, this treatment process comprises the steps: the nickel slag is heated to molten state, insulation makes the nickel slag keep molten state, wherein the nickel slag of molten state is meant that temperature is at 1150 ℃-1300 ℃, measure potassium ion in the nickel slag, the content of sodium ion, when the weight percentage of potassium ion greater than 0.05%, the weight percentage of sodium ion was greater than 0.05% o'clock, in the nickel slag, feed so that react and generate the chlorine of solid residue, the amount that feeds chlorine is that the amount of chlorine is a nickel slag 0.1-0.25 cubic meter per ton, the feeding time of chlorine is 5-10 minute, till this solid residue no longer generates, remove above-mentioned solid residue, remove the residue that the bottom accounts for the 4%-6% heavy metal layer of slag gross weight, get final product ferrous metasilicate, the molecular formula of ferrous metasilicate is FeSiO
32FeOSiO
2
Embodiment four: a kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate, this treatment process comprises the steps: directly to get the nickel slag that temperature is 1150 ℃ of-1300 ℃ of molten states, insulation makes the nickel slag keep molten state, in the nickel slag, feed simultaneously so that react and generate the oxygen of solid residue, the amount of aerating oxygen is a nickel slag 0.4-1 cubic meter per ton, the feeding time of oxygen is 5-10 minute, till this solid residue no longer generates, remove above-mentioned solid residue, remove the residue that the bottom accounts for the 4%-6% heavy metal layer of slag gross weight, get final product ferrous metasilicate, the molecular formula of ferrous metasilicate is FeSiO
32FeOSiO
2
Embodiment five: a kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate, this treatment process comprises the steps: directly to get the nickel slag that temperature is 1150 ℃ of-1300 ℃ of molten states, insulation makes the nickel slag keep molten state, in the nickel slag, feed simultaneously so that react and generate the air of solid residue, the amount of bubbling air is a nickel slag 2-5 cubic meter per ton, the feeding time of air is 5-10 minute, till this solid residue no longer generates, remove above-mentioned solid residue, remove the residue that the bottom accounts for the 4%-6% heavy metal layer of slag gross weight, get final product ferrous metasilicate, the molecular formula of ferrous metasilicate is FeSiO
32FeOSiO
2
Embodiment six: a kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate, this treatment process comprises the steps: directly to get the nickel slag that temperature is 1150 ℃ of-1300 ℃ of molten states, insulation makes the nickel slag keep molten state, measure potassium ion in the nickel slag, the content of sodium ion, when the weight percentage of potassium ion greater than 0.05%, the weight percentage of sodium ion was greater than 0.05% o'clock, in the nickel slag, feed so that react and generate the chlorine of solid residue, the amount that feeds chlorine is that the amount of chlorine is a nickel slag 0.1-0.25 cubic meter per ton, the feeding time of chlorine is 5-10 minute, till this solid residue no longer generates, remove above-mentioned solid residue, remove the bottom and account for the residue of the 4%-6% heavy metal layer of slag gross weight, get final product ferrous metasilicate, the molecular formula of ferrous metasilicate is FeSiO
32FeOSiO
2
Above-mentioned reaction is all carried out in the warm sludge bag.
Also needed to shake the warm sludge bag 30-40 minute above-mentioned before removing solid residue, left standstill then 8-12 minute.
Above-mentioned gas is to use graphitized carbon cellulosic material gas duct to stretch in this warm sludge bag with ventilation.
Claims (4)
1. a method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate is characterized in that this treatment process comprises the steps:
A, the nickel slag is heated to molten state or directly gets the nickel slag of molten state;
B, insulation make the nickel slag keep molten state, feed in the nickel slag simultaneously so that react and generate the oxygen or the air of solid residue;
C, remove above-mentioned solid residue, remove the residue that the bottom accounts for the 4%-6% heavy metal layer of slag gross weight and get final product; Wherein also will be incubated behind step b and make nickel slag maintenance molten state, feed chlorine simultaneously so that react in the nickel slag, the amount of chlorine is a nickel slag 0.1-0.25 cubic meter per ton, and the feeding time of chlorine is 5-10 minute.
2. a kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate as claimed in claim 1 is characterized in that:
Wherein the amount of aerating oxygen is a nickel slag 0.4-1 cubic meter per ton in step b, and the feeding time of oxygen is 5-10 minute.
3. a kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate as claimed in claim 1 is characterized in that:
Wherein the amount of bubbling air is a nickel slag 2-5 cubic meter per ton in step b, and the feeding time of air is 5-10 minute.
4. as any described a kind of method of utilizing purification and impurity removal of nickel smelting waste slag to produce ferrous metasilicate in the claim 1 to 4, it is characterized in that:
Wherein the nickel slag of molten state is meant that temperature is at 1150 ℃-1300 ℃.
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|---|---|---|---|
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|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148701A (en) * | 2007-09-06 | 2008-03-26 | 昆明理工大学 | Method for modifying non-ferrous metal copper slag/nickel slag by using combustible matter and preparing high-grade fuel |
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| CN101148701A (en) * | 2007-09-06 | 2008-03-26 | 昆明理工大学 | Method for modifying non-ferrous metal copper slag/nickel slag by using combustible matter and preparing high-grade fuel |
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Granted publication date: 20111005 Termination date: 20140212 |