CN110436500A - A kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces - Google Patents
A kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces Download PDFInfo
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- CN110436500A CN110436500A CN201910818088.0A CN201910818088A CN110436500A CN 110436500 A CN110436500 A CN 110436500A CN 201910818088 A CN201910818088 A CN 201910818088A CN 110436500 A CN110436500 A CN 110436500A
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- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/38—Preparation of aluminium oxide by thermal reduction of aluminous minerals
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
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Abstract
The invention discloses a kind of processing technologys for the bauxite fine ore production Brown Alundum that grade reduces, and include the following steps: 1) to be ground the lower Powder bauxite of grade, obtain miberal powder；2) it is added water into miberal powder to form, and be then pressed into block, obtain A product；3) A product are first preheated in the environment of 50-500 DEG C, is dehydrated 0.5-1.5h in the environment of being then placed in 900-1150 DEG C, obtains B product；4) B product are cooled to 150-250 DEG C, obtain C product；5) lye is sprayed on C product and carry out desiliconization, obtain D product；6) conventional smelt up to Brown Alundum is carried out after being dehydrated D product again.The present invention is fast with desiliconization speed, effect is good, and the feature that smelting temperature is low, the time is short, energy consumption is small and more environmentally-friendly is conducive to the range of choice for widening bauxite raw material, improves the quality of Brown Alundum, reduces production cost.
Description
Technical field
The present invention relates to a kind of processing technologys of Brown Alundum, especially a kind of to be produced using more low-grade bauxite fine ore
The processing technology of Brown Alundum.
Background technique
Brown Alundum, also known as diamond dust are a kind of Alundums.Brown Alundum main chemical is Al2O3, content exists
95.00%-97.00% separately contains a small amount of Fe, Si, Ti etc..Brown Alundum is most basic abrasive material, because its grinding performance is good, is applicable in
Range is wide, cheap, is widely used.
Existing Brown Alundum production is restored in electric arc furnaces by melting with three kinds of bauxite, carbon materials, iron filings raw materials
And be made, bauxite is very harsh to its quality requirement in production as primary raw material, wherein Al2O3Grade is not less than 80%,
SiO2Content be no more than 6%, the reserves of the high-quality bauxite in China are increasingly deficient at present, enterprise have to face using grade compared with
The reality of low raw material, and bauxite grade reduces mainly due to caused by silicone content increase in ore.Therefore, it is not influencing to produce
On the basis of process, efficient desiliconization how is realized, greatly improving bauxite raw material grade is particularly important.
In Brown Alundum smelting process, it is all made of natural good blocky bauxite, enters after calcined dehydration and smelts program,
Comparatively dense lump ore, smelting process internal-external temperature difference is big, and the temperature of required smelting is higher, the time is longer, can to smelt energy consumption
Increase.And ore, in recovery process, often with more Powder bauxite, this part of fine ore is due to poor air permeability, easily
In blocking burner hearth, excessive dust lime-ash is generated, pollutes environment, fine ore is unfavorable for raw material selection not as raw materials for metallurgy at present.
Summary of the invention
It is an object of the present invention to a kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces.The present invention
It is fast with desiliconization speed, effect is good, the feature that smelting temperature is low, the time is short, energy consumption is small and more environmentally-friendly, it is former to expand bauxite
The range of choice of material improves the quality of Brown Alundum, reduces production cost.
Technical solution of the present invention: a kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces, including such as
Lower step:
1) the lower Powder bauxite of grade is ground and is mixed, obtain miberal powder；
2) it is added water into miberal powder to form, and be then pressed into block, obtain A product；
3) A product are first preheated in the environment of 50-500 DEG C, calcined dehydration in the environment of being then placed in 900-1150 DEG C
0.5-1.5h obtains B product；
4) B product are cooled to 150-250 DEG C, obtain C product；
5) caustic alkali solution is sprayed on C product and carry out desiliconization, obtain D product；
6) conventional smelt up to Brown Alundum is carried out after being dehydrated D product again.
The processing technology for the bauxite fine ore production Brown Alundum that grade above-mentioned reduces, it is characterised in that: described in step 1)
Bauxite fine ore grade be 65-80%, A/S 6-10, the partial size of miberal powder is 37 μm -2000 μm after grinding.
The processing technology for the bauxite fine ore production Brown Alundum that grade above-mentioned reduces, in step 3), the preheating temperature
It is 100-200 DEG C.
The processing technology for the bauxite fine ore production Brown Alundum that grade above-mentioned reduces, in step 3), the calcined dehydration
Temperature is 1000-1120 DEG C, dewatering time 0.8-1.2h.
The processing technology for the bauxite fine ore production Brown Alundum that grade above-mentioned reduces, the calcined dehydration temperature is 1000
DEG C, dewatering time 1h.
The processing technology for the bauxite fine ore production Brown Alundum that grade above-mentioned reduces, in step 4), the cooling be from
It is so cooling.
In step 4) described in the processing technology for the bauxite fine ore production Brown Alundum that grade above-mentioned reduces, temperature after cooling
Degree is 200 DEG C.
The processing technology for the bauxite fine ore production Brown Alundum that grade above-mentioned reduces, in the step 5), caustic alkali solution
Concentration is 80-120g/L, and the lye after spray is Ke Xunhuanliyong.
The processing technology for the bauxite fine ore production Brown Alundum that grade above-mentioned reduces in the step 6), is dehydrated again
Calcined dehydration 0.5-1.5h in the environment of being 900-1150 DEG C.
Beneficial effects of the present invention
Powder bauxite is ground by the present invention first, then by miberal powder clamp dog, is cooled to after high-temperature calcination is dehydrated certain
Temperature carries out desiliconization by the way of spraying lye.On the one hand, since calcination temperature is higher, be conducive to silicon in bauxite ore
The activation of mineral is easy to react and remove with alkali, and the aluminium in ore becomes inert α-Al2O3, will not be reacted with alkali and
Loss；On the other hand, calcined lump ore has ideal porosity and granularity, and surface area is larger, relatively high
At a temperature of spray lye carry out desiliconization, the speed of desiliconization is fast, effect is good；It can be according to routine after block dehydration after desiliconization
Smelting process is smelted, due to the ore good permeability after agglomeration, and can be loose pile up, internal-external temperature difference is smaller when smelting,
It advantageously reduces smelting temperature, shorten the heat, reduce energy consumption, the lime-ash of generation is less, more environmentally-friendly.Also, fine ore at
Divide uniformly, the quality of obtained Brown Alundum product is more preferable, due to realizing the efficient desiliconization of bauxite, expands the selection model of raw material
It encloses, the market competitiveness for improving Brown Alundum industry is of great significance.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated, but is not intended as the foundation limited the present invention.
The embodiment of the present invention
The bauxite fine ore grade that following embodiment uses is 65-80%, A/S 6-10, after grinding the partial size of miberal powder be 37 μm-
2000μm。
Embodiment 1: a kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces includes the following steps:
1) Powder bauxite is ground, the partial size of miberal powder is 37 μm -2000 μm；
2) it is added water into miberal powder to form, and be then pressed into block, obtain A product；
3) A product are first preheated in the environment of 50 DEG C, is dehydrated 1.5h in the environment of being then placed in 900 DEG C, obtains B product；
4) B product natural cooling is cooled to 150 DEG C, obtains C product；
5) spray lye on C product and carry out desiliconization (caustic alkali solution concentration be 80g/L), obtain D product, after ore desiliconization its grade by
68.2% improve to the lye that 88.3%, A/S improves to 14.6, after spray by 7.2 collect after recycle；
6) conventional smelt up to Brown Alundum will be carried out in the environment of 900 DEG C of D product after calcined dehydration 1.5h again.
Embodiment 2: a kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces includes the following steps:
1) Powder bauxite is ground, the partial size of miberal powder is 37 μm -2000 μm；
2) it is added water into miberal powder to form, and be then pressed into block, obtain A product；
3) A product are first preheated in the environment of 100 DEG C, is dehydrated 0.8h in the environment of being then placed in 1080 DEG C, obtains B product；
4) B product natural cooling is cooled to 180 DEG C, obtains C product；
5) spray lye on C product and carry out desiliconization (caustic alkali solution concentration be 90g/L), obtain D product, after ore desiliconization its grade by
68.2% improve to the lye that 86.1%, A/S improves to 13.2, after spray by 7.2 collect after recycle；
6) conventional smelt up to Brown Alundum will be carried out in the environment of 1000 DEG C of D product after calcined dehydration 1.2h again.
Embodiment 3: a kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces includes the following steps:
1) Powder bauxite is ground, the partial size of miberal powder is 37 μm -2000 μm；
2) it is added water into miberal powder to form, and be then pressed into block, obtain A product；
3) A product are first preheated in the environment of 200 DEG C, is dehydrated 1.0h in the environment of being then placed in 1100 DEG C, obtains B product；
4) B product natural cooling is cooled to 220 DEG C, obtains C product；
5) spray lye on C product and carry out desiliconization (caustic alkali solution concentration be 100g/L), obtain D product, after ore desiliconization its grade by
70.1% improve to the lye that 87.4%, A/S improves to 15.3, after spray by 7.5 collect after recycle；
6) conventional smelt up to Brown Alundum will be carried out in the environment of 1050 DEG C of D product after calcined dehydration 1h again.
Embodiment 4: a kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces includes the following steps:
1) Powder bauxite is ground, the partial size of miberal powder is 37 μm -2000 μm；
2) it is added water into miberal powder to form, and be then pressed into block, obtain A product；
3) A product are first preheated in the environment of 300 DEG C, is dehydrated 1.2h in the environment of being then placed in 1120 DEG C, obtains B product；
4) B product natural cooling is cooled to 240 DEG C, obtains C product；
5) spray lye on C product and carry out desiliconization (caustic alkali solution concentration be 110g/L), obtain D product, after ore desiliconization its grade by
65.8% improve to the lye that 82.5%, A/S improves to 12.9, after spray by 6.7 collect after recycle；
6) conventional smelt up to Brown Alundum will be carried out in the environment of 1120 DEG C of D product after calcined dehydration 0.8h again.
Embodiment 5: a kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces includes the following steps:
1) Powder bauxite is ground, the partial size of miberal powder is 37 μm -2000 μm；
2) it is added water into miberal powder to form, and be then pressed into block, obtain A product；
3) A product are first preheated in the environment of 500 DEG C, is dehydrated 0.5h in the environment of being then placed in 1150 DEG C, obtains B product；
4) B product natural cooling is cooled to 250 DEG C, obtains C product；
5) spray lye on C product and carry out desiliconization, obtain D product (caustic alkali solution concentration be 120g/L), after ore desiliconization its grade by
70.1% improve to the lye that 81.6%, A/S improves to 13.1, after spray by 7.5 collect after recycle；
6) conventional smelt up to Brown Alundum will be carried out in the environment of 1150 DEG C of D product after calcined dehydration 0.5 again.
Claims (9)
1. a kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces, which comprises the steps of:
1) the lower Powder bauxite of grade is ground and is mixed, obtain miberal powder；
2) it is added water into miberal powder to form, and be then pressed into block, obtain A product；
3) A product are first preheated in the environment of 50-500 DEG C, calcined dehydration in the environment of being then placed in 900-1150 DEG C
0.5-1.5h obtains B product；
4) B product are cooled to 150-250 DEG C, obtain C product；
5) caustic alkali solution is sprayed on C product and carry out desiliconization, obtain D product；
6) conventional smelt up to Brown Alundum is carried out after being dehydrated D product again.
2. the processing technology for the bauxite fine ore production Brown Alundum that grade according to claim 1 reduces, it is characterised in that:
Bauxite fine ore grade described in step 1) is 65-80%, A/S 6-10, and the partial size of miberal powder is 37 μm -2000 μm after grinding.
3. the processing technology for the bauxite fine ore production Brown Alundum that grade according to claim 1 reduces, it is characterised in that:
In step 3), the preheating temperature is 100-200 DEG C.
4. the processing technology for the bauxite fine ore production Brown Alundum that grade according to claim 1 reduces, it is characterised in that:
In step 3), the calcined dehydration temperature is 1000-1120 DEG C, dewatering time 0.8-1.2h.
5. the processing technology for the bauxite fine ore production Brown Alundum that grade according to claim 4 reduces, it is characterised in that:
The calcined dehydration temperature is 1000 DEG C, dewatering time 1h.
6. the processing technology for the bauxite fine ore production Brown Alundum that grade according to claim 1 reduces, it is characterised in that:
In step 4), the cooling is natural cooling.
7. the processing technology for the bauxite fine ore production Brown Alundum that grade according to claim 1 reduces, it is characterised in that:
In the step 4), temperature after cooling is 200 DEG C.
8. the processing technology for the bauxite fine ore production Brown Alundum that grade according to claim 1 reduces, it is characterised in that:
In the step 5), caustic alkali solution concentration is 80-120g/L, and the lye after spray is Ke Xunhuanliyong.
9. the processing technology for the bauxite fine ore production Brown Alundum that grade according to claim 1 reduces, it is characterised in that:
In the step 6), dehydration is calcined dehydration 0.5-1.5h in the environment of 900-1150 DEG C again.
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| CN201910818088.0A CN110436500A (en) | 2019-08-30 | 2019-08-30 | A kind of processing technology for the bauxite fine ore production Brown Alundum that grade reduces |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939041A (en) * | 2021-02-11 | 2021-06-11 | 贵州大学 | Method for strengthening low-grade bauxite desilication by using brown corundum fly ash |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108439443A (en) * | 2018-03-29 | 2018-08-24 | 贵州遵义金山磨料有限公司 | A kind of method that Brown Alundum production is homogenized with bauxite ore |
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- 2019-08-30 CN CN201910818088.0A patent/CN110436500A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108439443A (en) * | 2018-03-29 | 2018-08-24 | 贵州遵义金山磨料有限公司 | A kind of method that Brown Alundum production is homogenized with bauxite ore |
Non-Patent Citations (1)
| Title |
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| 谢振山等: "中低品位高硫铝土矿焙烧脱硅研究", 《有色金属（冶炼部分）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939041A (en) * | 2021-02-11 | 2021-06-11 | 贵州大学 | Method for strengthening low-grade bauxite desilication by using brown corundum fly ash |
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