CN110357596A - A kind of modified lateritic nickel ore rotary kiln dedicated pouring material and its manufacturing method - Google Patents

A kind of modified lateritic nickel ore rotary kiln dedicated pouring material and its manufacturing method Download PDF

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CN110357596A
CN110357596A CN201910658415.0A CN201910658415A CN110357596A CN 110357596 A CN110357596 A CN 110357596A CN 201910658415 A CN201910658415 A CN 201910658415A CN 110357596 A CN110357596 A CN 110357596A
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rotary kiln
nickel ore
bauxite
lateritic nickel
fine powder
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周强
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JIANGSU JIANGNENG NEW MATERIAL TECHNOLOGY Co Ltd
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JIANGSU JIANGNENG NEW MATERIAL TECHNOLOGY Co Ltd
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Abstract

A kind of modified lateritic nickel ore rotary kiln dedicated pouring material, the component including following weight percent: bauxite, electrofused mullite fine powder, South Africa chromium sand, white fused alumina fine powder, SILICA FUME and Reactive alumina；Its manufacturing method, the following steps are included: proportionally weighing the bauxite of different-grain diameter, electrofused mullite fine powder, South Africa chromium sand, white fused alumina fine powder, SILICA FUME and Reactive alumina, mixing is added rotator type kneading machine and is uniformly kneaded 35~50 minutes, then gained mixed material is poured into model and carries out casting sizing, then kiln-firing after natural drying at normal temperature.Lateritic nickel ore rotary kiln dedicated pouring material service performance of the present invention is good, and the degree of wear is small, efficiently solves the disadvantages of lateritic nickel ore rotary kiln is easy to wear, thermal shock resistance is poor, intensity is lower, service life is short with existing castable refractory.

Description

A kind of modified lateritic nickel ore rotary kiln dedicated pouring material and its manufacturing method
Technical field
The invention belongs to fire resisting material fields, and in particular to a kind of modified lateritic nickel ore rotary kiln dedicated pouring material and its Manufacturing method.
Background technique
Nickel is a kind of important strategic material, and since 2005, China replaced Japan to become nickel consumption figure in the world Maximum country.Currently, grade it is high nickel sulfide ore resource it is increasingly exhausted, and account for nickel reserves 70% low-grade nickel ore ( Lateritic nickel ore) it is resourceful, cost of winning is low, can be used to produce a variety of intermediate products such as nickel oxide, nickel matte, ferronickel.Therefore, " the great industry skill that the proportion of utilization of lateritic nickel ore resource was organized and implemented in the trend that rises rapidly, China in 2008 in recent years In art development special ", exploitation " efficiently utilizing low-grade laterite nickel ore key technology " is just contained.As it can be seen that exploitation lateritic nickel ore Efficient technique of rainwater utilization is the inexorable trend of China's nickel industrial development.
In recent years, China's lateritic nickel ore direct reduction process for rotary kiln technology rapidly develops, its working principle is that: with laterite Josephinite is raw material, using cheap coal, mud coal, middle coal as reducing agent, using rotary kiln as main production equipments, at material preheating Reason-reducing and smelting technique-sorting refines three steps, so that it may form product, have simple process, energy consumption is small, pollutes small, cost It is low, not by size limit, the advantages that product nickel content is high.
Lateritic nickel ore rotary kiln is by feed inlet, preheating zone, changeover portion, firing section (high temperature section) and firing section discharge port group At.Kiln body changeover portion temperature is substantially at 600-700 DEG C or so, and in this section, material is preheated, generated by the drying of early period Part internal combustion is easy half melt block, and slag is more apparent, therefore abrasiveness is larger, and when close to high temperature section, and material is located substantially In fritting state, certain aggressivity has been produced.The temperature for being burnt into section is high in 1000-1200 DEG C or so, production process Erosion and violent scour of the warm slag to the resistance to material of inner liner of rotary kiln, the impact of material in rotary kiln rotation process, and oxidation is also The structural stress that original reaction generates can generate erosion to rotary kiln, once corroding, will lead to resistance to material and peel off, service life It cannot ensure.The resistance to material of lateritic nickel ore inner liner of rotary kiln need to be subjected to serious calorifics, mechanics, chemical depletion and act on, therefore its liner Resistance to material should have the performance of good anti-erosion, high wear resistance, high intensity.
Summary of the invention
The object of the present invention is to provide it is a kind of with good anti-erosion, high wear resistance, high-intensity performance lateritic nickel ore Rotary kiln dedicated pouring material and its manufacturing method.
The purpose of the present invention is what is be achieved through the following technical solutions: a kind of modified lateritic nickel ore rotary kiln dedicated pouring Material, the component including following weight percent:
The bauxite 1 ~ 15% of 8 ~ 15mm of partial size；
The bauxite 1 ~ 20% of 5 ~ 8mm of partial size；
The bauxite 1 ~ 25% of 3 ~ 5mm of partial size；
The bauxite 5 ~ 30% of 1 ~ 3mm of partial size；
The bauxite 5 ~ 20% of 0 ~ 1mm of partial size；
Electrofused mullite fine powder 5 ~ 10%；
South Africa chromium sand 3 ~ 8%；
White fused alumina fine powder 1 ~ 15%；
Silicon powder 1 ~ 15%；
Reactive alumina 1 ~ 15%.
Further, a kind of modified lateritic nickel ore rotary kiln dedicated pouring material, which is characterized in that the aluminium alum Al in soil2O3Content >=80%, Fe2O3Content≤1.2%, 2.7~2.85g/cm of bulk density3.Adjust the partial size of bauxite Distribution, is prepared into 5 kinds of grain size specifications, the bauxite for solving single specification partial size is unevenly distributed in castable, mobility not Good, local the shortcomings that being prone to wear destruction, effectively improve the mobility of bauxite after firing, and extends and fires making for product Use the service life.
Further, the electrofused mullite fine powder mesh number be 320 mesh, using this mesh number electrofused mullite fine powder compared with The good high thermal shock resistance for proposing castable.
Further, the South Africa chromium sand grains diameter is 5~8mm, 3~5mm, 1~3mm, 0.1~1mm, using different grains The South Africa chromium sand of diameter can effectively propose the high corrosion resistance of castable.
Further, Al in the white fused alumina fine powder2O3Content >=99%, mesh number are 320 mesh.Using white fused alumina fine powder Because having the characteristics that fabulous thermal shock resistance and anti-slag action, crystal grain intensity are high under its high temperature.
Further, metal silicone content >=99% in the SILICA FUME, 0~1 μm of partial size.
Further, the Reactive alumina is α-Al2O3Content >=99%, mesh number are the active oxygen of 325 mesh Change aluminium micro mist, Reactive alumina is easily dispersed, stable chemical performance, high-temperature shrinkage moderate performance, has good sintering Performance, high conversion rate can sufficiently be sintered to form fine and close institutional framework, obtain good intensity and wearability.
Further, a kind of manufacturing method of modified lateritic nickel ore rotary kiln dedicated pouring material, comprising the following steps:
(1) bauxite is ground up, sieved, and respectively obtains the aluminium of 8~15mm of partial size, 5~8mm, 3~5mm, 1~3mm, 0.1~1mm Alumina；
(2) chromium sand in South Africa is ground up, sieved, and respectively obtains the South Africa chromium of 5~8mm of partial size, 3~5mm, 1~3mm, 0.1~1mm Sand.
(2) bauxite of different-grain diameter, electrofused mullite fine powder, South Africa chromium sand, white fused alumina fine powder, micro- is proportionally weighed Silicon powder and Reactive alumina, mixing is added rotator type kneading machine and is uniformly kneaded 35~50 minutes, then by gained mixture Material pours into model and carries out casting sizing, then kiln-firing after natural drying at normal temperature.
Castable of the present invention is preparing the application in lateritic nickel ore inner liner of rotary kiln.
Each raw material is weighed mix according to the ratio by lateritic nickel ore rotary kiln dedicated pouring material of the present invention, and trimerization is added Sodium phosphate accounts for slurry (the wherein additional amount of water, water-reducing agent that raw material gross weight 5-8% water stirs evenly obtained good fluidity The additional amount of sodium tripolyphosphate is the common knowledge of those skilled in the art, and those skilled in the art can according to need progress Adjustment), physical property is tested after molding, maintenance and heat treatment.
Every physical and chemical index of lateritic nickel ore rotary kiln dedicated pouring material are as follows:
The utility model has the advantages that a kind of lateritic nickel ore rotary kiln dedicated pouring material manufacturing method of (1) present invention is simple, moderate cost；Pass through Reasonable castable component and its ratio are selected, the particle diameter distribution of component is adjusted, makes uniform component distribution, while improving casting The mobility of material forms wear-resisting property and mechanical performance that firm Ceramic bond improves material, corrosion resistance through high temperature sintering With erosion resistibility is strong, abrasion resistance is higher, thermal shock resistance is good, and acid-base property atmosphere is adaptable etc..
(2) lateritic nickel ore rotary kiln dedicated pouring material service performance of the present invention is good, and the degree of wear is small, returns in lateritic nickel ore Rotary kiln is reduced directly service life in process high-temperature section and greatly reduced ferronickel enterprise's production cost up to 1 year or more, reduces comprehensive Energy consumption is closed, is required well beyond user；Efficiently solve lateritic nickel ore rotary kiln with existing castable refractory easy to wear, anti-thermal shock The disadvantages of property is poor, intensity is lower, service life is short, and maintenance cost is reduced, it can get considerable economic benefit.
(3) the high thermal shock resistance of castable is preferably mentioned in the present invention using electrofused mullite fine powder.
(4) the high corrosion resistance of castable can be effectively proposed in the present invention using South Africa chromium sand.
(5) lateritic nickel ore rotary kiln dedicated pouring material of the invention, good fluidity when having vibrating casting construction, is easy shape At the pour mass of tissue compact and uniform structure, show that high temperature resistance is good, and anti-ferronickel aggressivity is excellent, and long service life etc. is excellent Point, it is obvious to the running rate, reduction refractory consumption rate, reduction energy consumption and the production cost effect that improve mineral hot furnace.In addition, The construction labor intensity of the flame-proof pouring material special is low, and construction environment is good.
Specific embodiment
Further technical solution of the present invention is described further by following embodiments.
Embodiment 1: a kind of modified lateritic nickel ore rotary kiln dedicated pouring material, the group including following weight percent Point:
The bauxite 6% of 8 ~ 15mm of partial size；
The bauxite 9% of 5 ~ 8mm of partial size；
The bauxite 12% of 3 ~ 5mm of partial size；
The bauxite 18% of 1 ~ 3mm of partial size；
The bauxite 11% of 0 ~ 1mm of partial size；
Electrofused mullite fine powder 8%；
South Africa chromium sand 5%；
White fused alumina fine powder 11%；
Silicon powder 12%；
Reactive alumina 8%.
A kind of manufacturing method of modified lateritic nickel ore rotary kiln dedicated pouring material, comprising the following steps:
(1) bauxite is ground up, sieved, and respectively obtains the aluminium of 8~15mm of partial size, 5~8mm, 3~5mm, 1~3mm, 0.1~1mm Alumina；
(2) chromium sand in South Africa is ground up, sieved, and respectively obtains the South Africa chromium of 5~8mm of partial size, 3~5mm, 1~3mm, 0.1~1mm Sand.
(2) bauxite of different-grain diameter, electrofused mullite fine powder, South Africa chromium sand, white fused alumina fine powder, micro- is proportionally weighed Silicon powder and Reactive alumina, mixing are added rotator type kneading machine and are uniformly kneaded 40 minutes, then fall gained mixed material Enter model and carry out casting sizing, then kiln-firing after natural drying at normal temperature.
Embodiment 2: a kind of modified lateritic nickel ore rotary kiln dedicated pouring material, the group including following weight percent Point:
The bauxite 8% of 8 ~ 15mm of partial size；
The bauxite 13% of 5 ~ 8mm of partial size；
The bauxite 10% of 3 ~ 5mm of partial size；
The bauxite 19% of 1 ~ 3mm of partial size；
The bauxite 9% of 0 ~ 1mm of partial size；
Electrofused mullite fine powder 9%；
South Africa chromium sand 7%；
White fused alumina fine powder 9%；
Silicon powder 9%；
Reactive alumina 7%.
A kind of manufacturing method of modified lateritic nickel ore rotary kiln dedicated pouring material, comprising the following steps:
(1) bauxite is ground up, sieved, and respectively obtains the aluminium of 8~15mm of partial size, 5~8mm, 3~5mm, 1~3mm, 0.1~1mm Alumina；
(2) chromium sand in South Africa is ground up, sieved, and respectively obtains the South Africa chromium of 5~8mm of partial size, 3~5mm, 1~3mm, 0.1~1mm Sand.
(2) bauxite of different-grain diameter, electrofused mullite fine powder, South Africa chromium sand, white fused alumina fine powder, micro- is proportionally weighed Kiln-firing after rotator type kneading machine is uniformly kneaded 38 is added in silicon powder and Reactive alumina, mixing.
Embodiment 3: a kind of modified lateritic nickel ore rotary kiln dedicated pouring material, the group including following weight percent Point:
The bauxite 11% of 8 ~ 15mm of partial size；
The bauxite 7% of 5 ~ 8mm of partial size；
The bauxite 15% of 3 ~ 5mm of partial size；
The bauxite 22% of 1 ~ 3mm of partial size；
The bauxite 7% of 0 ~ 1mm of partial size；
Electrofused mullite fine powder 6%；
South Africa chromium sand 8%；
White fused alumina fine powder 7%；
Silicon powder 6%；
Reactive alumina 11%.
A kind of manufacturing method of modified lateritic nickel ore rotary kiln dedicated pouring material, comprising the following steps:
(1) bauxite is ground up, sieved, and respectively obtains the aluminium of 8~15mm of partial size, 5~8mm, 3~5mm, 1~3mm, 0.1~1mm Alumina；
(2) chromium sand in South Africa is ground up, sieved, and respectively obtains the South Africa chromium of 5~8mm of partial size, 3~5mm, 1~3mm, 0.1~1mm Sand.
(2) bauxite of different-grain diameter, electrofused mullite fine powder, South Africa chromium sand, white fused alumina fine powder, micro- is proportionally weighed Silicon powder and Reactive alumina, mixing are added rotator type kneading machine and are uniformly kneaded 42 minutes, then fall gained mixed material Enter model and carry out casting sizing, then kiln-firing after natural drying at normal temperature.

Claims (9)

1. a kind of modified lateritic nickel ore rotary kiln dedicated pouring material, which is characterized in that the group including following weight percent Point:
The bauxite 1 ~ 15% of 8 ~ 15mm of partial size；
The bauxite 1 ~ 20% of 5 ~ 8mm of partial size；
The bauxite 1 ~ 25% of 3 ~ 5mm of partial size；
The bauxite 5 ~ 30% of 1 ~ 3mm of partial size；
The bauxite 5 ~ 20% of 0 ~ 1mm of partial size；
Electrofused mullite fine powder 5 ~ 10%；
South Africa chromium sand 3 ~ 8%；
White fused alumina fine powder 1 ~ 15%；
Silicon powder 1 ~ 15%；
Reactive alumina 1 ~ 15%.
2. a kind of modified lateritic nickel ore rotary kiln dedicated pouring material according to claim 1, which is characterized in that described Al in bauxite2O3Content >=80%, Fe2O3Content≤1.2%, 2.7~2.85g/cm of bulk density3。
3. a kind of modified lateritic nickel ore rotary kiln dedicated pouring material according to claim 1, which is characterized in that described Electrofused mullite fine powder mesh number is 320 mesh.
4. a kind of modified lateritic nickel ore rotary kiln dedicated pouring material according to claim 1, which is characterized in that described South Africa chromium sand grains diameter is 5~8mm, 3~5mm, 1~3mm, 0.1~1mm.
5. a kind of modified lateritic nickel ore rotary kiln dedicated pouring material according to claim 1, which is characterized in that described Al in white fused alumina fine powder2O3Content >=99%, mesh number are 320 mesh.
6. a kind of modified lateritic nickel ore rotary kiln dedicated pouring material according to claim 1, which is characterized in that described Metal silicone content >=99% in SILICA FUME, 0~1 μm of partial size.
7. a kind of modified lateritic nickel ore rotary kiln dedicated pouring material according to claim 1, which is characterized in that described Reactive alumina is α-Al2O3Content >=99%, mesh number are the Reactive alumina of 325 mesh.
8. a kind of manufacturing method of modified lateritic nickel ore rotary kiln dedicated pouring material according to claim 1, including with Lower step:
(1) bauxite is ground up, sieved, and respectively obtains the aluminium of 8~15mm of partial size, 5~8mm, 3~5mm, 1~3mm, 0.1~1mm Alumina；
(2) chromium sand in South Africa is ground up, sieved, and respectively obtains the South Africa chromium of 5~8mm of partial size, 3~5mm, 1~3mm, 0.1~1mm Sand.
9. (2) proportionally weighing the bauxite of different-grain diameter, electrofused mullite fine powder, South Africa chromium sand, white fused alumina fine powder, micro- silicon Powder and Reactive alumina, mixing is added rotator type kneading machine and is uniformly kneaded 35~50 minutes, then by gained mixed material It pours into model and carries out casting sizing, then kiln-firing after natural drying at normal temperature.
CN201910658415.0A 2019-07-22 2019-07-22 A kind of modified lateritic nickel ore rotary kiln dedicated pouring material and its manufacturing method Pending CN110357596A (en)

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