CN113683106A - Method for producing alumina without calcium or with low calcium - Google Patents
Method for producing alumina without calcium or with low calcium Download PDFInfo
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- CN113683106A CN113683106A CN202111133213.8A CN202111133213A CN113683106A CN 113683106 A CN113683106 A CN 113683106A CN 202111133213 A CN202111133213 A CN 202111133213A CN 113683106 A CN113683106 A CN 113683106A
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- additive
- calcium
- mother liquor
- bauxite
- ore pulp
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 239000011575 calcium Substances 0.000 title claims abstract description 21
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 21
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 239000000654 additive Substances 0.000 claims abstract description 86
- 230000000996 additive effect Effects 0.000 claims abstract description 86
- 239000012452 mother liquor Substances 0.000 claims abstract description 51
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 41
- 239000002002 slurry Substances 0.000 claims abstract description 40
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 36
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 36
- 239000004571 lime Substances 0.000 claims abstract description 36
- 238000004090 dissolution Methods 0.000 claims abstract description 33
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 229920002678 cellulose Polymers 0.000 claims abstract description 17
- 239000001913 cellulose Substances 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 229920002472 Starch Polymers 0.000 claims description 12
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 12
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 12
- 239000011734 sodium Substances 0.000 claims description 12
- 229910052708 sodium Inorganic materials 0.000 claims description 12
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 12
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 12
- 239000008107 starch Substances 0.000 claims description 12
- 235000019698 starch Nutrition 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 20
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 description 25
- 238000002386 leaching Methods 0.000 description 24
- 229910001773 titanium mineral Inorganic materials 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 230000029087 digestion Effects 0.000 description 5
- 238000010790 dilution Methods 0.000 description 5
- 239000012895 dilution Substances 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 238000004131 Bayer process Methods 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of alumina production, in particular to a method for producing alumina without calcium or with low calcium. The method for producing the alumina without calcium comprises the following steps: mixing the calcium-free dissolving additive and the circulating mother liquor, heating to 90-100 ℃, and preserving heat for 4-6 hours to obtain additive slurry; wherein the calcium-free dissolving-out additive is composed of iron powder and ether cellulose; mixing the additive slurry with the raw ore slurry, and carrying out pre-desiliconization to obtain desiliconized ore slurry; the raw ore pulp is prepared from circulating mother liquor and bauxite, and lime is not added in the raw ore pulp; adding circulating mother liquor into the desiliconized ore pulp, and then carrying out high-pressure dissolution. The scheme of the invention uses no calcium additive or a small amount of lime to promote the dissolution of alumina from bauxite, thereby ensuring the normal high-pressure dissolution of diasporic bauxite and avoiding or reducing the harm of the lime in the process of producing the alumina by using the diasporic bauxite as a raw material.
Description
Technical Field
The invention relates to the technical field of alumina production, in particular to a method for producing alumina without calcium or with low calcium.
Background
The majority of Chinese bauxite is diasporic bauxite, has the characteristics of high aluminum and high silicon, and generally contains 2-4% of titanium mineral. Among them, titanium minerals exist in the form of rutile, anatase and brookite. In the Bayer process leaching process of diasporic bauxite, the leaching rate of alumina is obviously reduced by titanium minerals, and the higher the content of the titanium minerals in the bauxite is, the more the titanium minerals are dispersed, the greater the influence on the leaching of the alumina is.
Conventionally, lime is added to a leaching system in order to eliminate the influence of titanium minerals on the leaching of alumina. The addition amount of lime is usually 10-20% of bauxite.
Although the lime is added to eliminate the adverse effect of titanium minerals on alumina dissolution, the lime also has the advantages of reducing alkali consumption, improving the settling property of red mud and the like, but also brings some hazards, specifically as follows:
1. the alumina loss is increased due to the generation of hydrated garnet.
2. Under the condition of high temperature, the sodium aluminate solution has more side reactions, and the effective function of the lime is not obviously exerted. 3. The red mud amount and the red mud washing water amount are obviously increased, the burden of red mud sedimentation and washing is increased, and the energy consumption of dilution and evaporation processes of various valuable elements in the red mud is increased.
4. The calcined lime contains calcium carbonate inevitably, and is subjected to causticization in the bauxite dissolution process, so that the concentration of sodium carbonate in a system is increased, the evaporation salt discharge amount is increased, and the causticization amount is increased.
5. The addition of lime is large and cannot be recycled, so that the production cost of the alumina is increased.
Disclosure of Invention
In view of the above-mentioned disadvantages and problems of the prior art, it is an object of the present invention to provide a method for producing alumina without calcium or with low calcium, which can promote the dissolution of alumina from bauxite by using a calcium-free additive or a small amount of lime during the bayer process dissolution of bauxite, especially diasporic bauxite, and reduce the use amount of lime during the production of alumina from diasporic bauxite while ensuring the normal high-pressure dissolution of diasporic bauxite, thereby avoiding or reducing the damage of lime during the production of alumina from diasporic bauxite.
To achieve the above and other related objects, there is provided in a first aspect of the present invention a calcium-free method for producing alumina, comprising: mixing the calcium-free dissolving additive and the circulating mother liquor, heating to 90-100 ℃, and preserving heat for 4-6 hours to obtain additive slurry; wherein the calcium-free dissolving-out additive is composed of iron powder and ether cellulose; mixing the additive slurry with the raw ore slurry, and carrying out pre-desiliconization to obtain desiliconized ore slurry; the raw ore pulp is prepared from circulating mother liquor and bauxite, and lime is not added in the raw ore pulp; adding circulating mother liquor into the desiliconized ore pulp, and then carrying out high-pressure dissolution.
In some embodiments, the additive is used in an amount of 0.1% of the dry ore mass of bauxite; wherein the bauxite is diasporic bauxite.
In some embodiments, the ether cellulose is one or both of sodium carboxymethyl cellulose and sodium carboxymethyl starch.
In some embodiments, the mixing of the calcium-free dissolution additive and the recycle mother liquor is specifically: adding circulating mother liquor into the calcium-free dissolution additive to ensure that the solid content of the additive slurry is 15-20 g/L.
In some embodiments, the adding of the circulating mother liquor to the desiliconized ore pulp is specifically: adding circulating mother liquor into the desiliconized ore pulp to ensure that the solid content of the mixed ore pulp is 200 g/L.
In some embodiments, the calcium-free dissolution additive and the recycled mother liquor are mixed and heated to 90-100 ℃ and held for 4-6 hours to obtain an additive slurry comprising: mixing the additive with a first amount of circulating mother liquor to obtain a premixed additive; and mixing the premixed additive and a second amount of circulating mother liquor, heating to 90-100 ℃, and preserving heat for 4-6 hours to obtain the additive slurry.
In a second aspect of the invention, there is provided a method for producing alumina with low calcium, comprising: mixing bauxite, circulating mother liquor and a small amount of lime to prepare raw ore pulp, wherein the addition amount of the lime is 3% of the dry ore mass of the bauxite; after the primary ore pulp is subjected to pre-desiliconization, the circulating mother liquor is added to adjust the primary ore pulp into qualified ore pulp for high-pressure dissolution. .
In some embodiments, the bauxite is diasporic type bauxite.
The method for producing alumina without calcium or with low calcium provided by this embodiment can replace lime with a calcium-free leaching additive in the alumina production process, or use a small amount of lime, eliminate the effect of titanium minerals on alumina leaching, avoid or reduce the harm of lime in the alumina production process using diasporic bauxite as a raw material, and make the red mud-aluminum ratio (a/S) <1.1, improve the alumina leaching rate, make the relative leaching rate of alumina reach 97%, directly reduce the amount of red mud generated in the alumina leaching process, and can make the amount of red mud reduced by about 15% in the leaching process.
Drawings
Fig. 1 is a device for adding an additive according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Example 1 calcium-free Process for producing alumina
This example provides a process that can use a calcium-free digestion additive instead of lime to promote digestion of alumina from bauxite. Wherein the calcium-free leaching additive consists of iron powder and ether cellulose. The calcium-free leaching additive is a novel lightweight non-lime additive. The specific components of the calcium-free leaching additive will be described below, and will not be described herein again.
The calcium-free leaching additive and the circulating mother liquor can be mixed, heated to 90-100 ℃, and kept warm for 4-6 hours to obtain additive slurry.
Specifically, the calcium-free leaching additive may be added during the alumina production process using the addition apparatus described in fig. 1. Referring to fig. 1, a calcium-free dissolution additive may be added to the premix tank, wherein the additive may be added to the premix tank at a rate of 1.1 tons/4 h. Namely, the additive is added into the premixing tank at the speed of: every 4 hours (h), 1.1 ton (t) of additive was added.
The premixing groove is communicated with the circulating mother liquor pipeline and receives the circulating mother liquor from the circulating mother liquor pipeline. Wherein, under the condition that the speed of adding the additive into the premixing tank is 1.1 ton/4 h, the speed of conveying the circulating mother liquor into the premixing tank by the circulating mother liquor pipeline is 11m3And/4 h. I.e. 11 cubic meters of recycled mother liquor is added per 1.1 ton of additive.
And (3) fully and uniformly mixing the additive and the circulating mother liquor in the premixing tank by stirring and a self-circulating pump to obtain the premixed additive. The premix additive may also be referred to as a pretreatment additive.
With continued reference to fig. 1, the additive apparatus further includes a preparation tank a. The preparation tank A is communicated with the premixing tank and the circulating mother liquor pipeline. The premix additive in the premix tank may be pumped into the preparation tank a via a preparation pump while adding a certain amount of circulating mother liquor. Wherein, under the condition that the speed of adding the additive into the premixing tank is 1.1 ton/4 h, the speed of conveying the circulating mother liquor into the premixing tank by the circulating mother liquor pipeline is 44m3And/4 h. I.e., 44 cubic meters of recycled mother liquor is added to the premix additive per 1.1 ton of additive preparation. Therefore, additive slurry with the solid content of 15-20g/l can be prepared. Wherein the additive slurry may also be referred to as a make additive.
A preparation tank coil (not shown) is provided in the preparation tank a. The preparation tank coil may be in communication with a steam generating device (not shown). The steam generating apparatus may feed steam to the preparation tank coil of preparation tank a to heat the additive slurry in preparation tank a. Specifically, the additive slurry is heated to 90-100 ℃, and is subjected to heat preservation pretreatment for 4-6 hours.
Then, the additive slurry and the raw ore slurry can be mixed for pre-desiliconization to obtain desiliconized ore slurry; the raw ore pulp is prepared from circulating mother liquor and bauxite, and lime is not added in the raw ore pulp.
Specifically, with reference to fig. 1, the preparation tank a is communicated with the pre-desiliconization tank, and the additive slurry that is qualified in the preparation tank a can be output to the pre-desiliconization tank. Wherein, when the adding speed of the additive to the pre-mixing tank is 1.1 ton/4 h, the output speed of the additive slurry from the preparation tank A to the pre-desilication tank is 13.75m3/h。
With continued reference to fig. 1, the additive apparatus further includes a preparation tank B. That is, the addition apparatus includes two preparation tanks, and when the additive slurry prepared in one of the preparation tanks is prepared successfully and the additive slurry is output to the pre-desiliconization tank, the other preparation tank can perform the preparation of the additive slurry. The two preparation grooves are used alternately, so that the preparation efficiency of the additive slurry is improved, and the production efficiency of the aluminum oxide is further improved.
And pumping the qualified additive slurry into a pre-desilication tank by using a feeding pump, mixing the additive slurry with the raw ore slurry (wherein the volume ratio of the additive slurry to the raw ore slurry is 1:80), and performing pre-desilication for 8 hours to obtain desilication ore slurry. Wherein, the preparation process of the raw ore pulp comprises the following steps: mixing diasporic bauxite, lime and circulating mother liquor in the preparation process of raw ore pulp to obtain the raw ore pulp. Namely, lime is not added into the raw ore pulp.
Then, adding circulating mother liquor into the desiliconized ore pulp, and then carrying out high-pressure dissolution.
Appropriate circulating mother liquor can be supplemented into the desiliconized ore pulp to obtain ore pulp to be dissolved. And conveying the ore pulp to be dissolved into a high-pressure dissolving system by a high-pressure diaphragm pump. Wherein each 13.75m3Adding 110m of additive slurry correspondingly3-160m3The solid content of the ore pulp to be dissolved is 200 g/L.
In a high-pressure digestion system, the ore pulp to be digested is subjected to digestion treatment, and then the procedures of dilution, sedimentation separation, decomposition, roasting and evaporation are carried out, so that the alumina is produced.
The specific implementation processes of the pre-desiliconization, dissolution, dilution, sedimentation separation, decomposition, roasting, evaporation and other processes can refer to the description of the prior art, and are not described herein again.
Next, specific components of the calcium-free elution additive will be specifically described.
In one example, in the calcium-free dissolution additive, the mass ratio between the iron powder and the ether cellulose is (1: 99) to (99: 1). In one example of this example, the mass ratio between iron powder and ether cellulose is 1: 1. in one example of this example, the mass ratio between iron powder and ether cellulose is 1: 10. in one example of this example, the mass ratio between iron powder and ether cellulose is 1: 20. in one example of this example, the mass ratio between iron powder and ether cellulose is 1: 50. in one example of this example, the mass ratio between iron powder and ether cellulose is 10: 1. in one example of this example, the mass ratio between iron powder and ether cellulose is 20: 1. in one example of this example, the mass ratio between iron powder and ether cellulose is 50: 1.
in one example, the ethereal cellulose constituting the calcium-free dissolution additive is specifically sodium carboxymethylcellulose.
In one example, the ether cellulose constituting the calcium-free dissolution additive is specifically sodium carboxymethyl starch.
In one example, the ethereal cellulose constituting the calcium-free dissolution additive is specifically a composition of sodium carboxymethyl starch and sodium carboxymethyl cellulose. In one example of this example, the mass ratio between sodium carboxymethyl starch and sodium carboxymethyl cellulose is 1: 1. in one example of this example, the mass ratio between sodium carboxymethyl starch and sodium carboxymethyl cellulose is 1: 2. in one example of this example, the mass ratio between sodium carboxymethyl starch and sodium carboxymethyl cellulose is 1: 3. in one example of this example, the mass ratio between sodium carboxymethyl starch and sodium carboxymethyl cellulose is 1: 5. in one example of this example, the mass ratio between sodium carboxymethyl starch and sodium carboxymethyl cellulose is 1: 10. in one example of this example, the mass ratio between sodium carboxymethyl starch and sodium carboxymethyl cellulose is 9: 1. in one example of this example, the mass ratio between sodium carboxymethyl starch and sodium carboxymethyl cellulose is 6: 1. in one example of this example, the mass ratio between sodium carboxymethyl starch and sodium carboxymethyl cellulose is 2: 1.
in one example, the particle size of the iron powder is 150 to 500 μm.
In one example, the particle size of the iron powder is 44 to 150 μm.
In this embodiment, a non-lime additive, i.e., a calcium-free leaching additive, is used to achieve red mud emission reduction and valuable mineral enrichment during the leaching process. Based on the synthesis of the calcium-free dissolution additive, the blocking effect of the titanium mineral is efficiently eliminated through the interfacial effect, and the Bayer-method calcium-free Bayer-method dissolution of the diasporic ore is realized; by mineral phase transformation, alumina loss caused by calcium-silicon slag is avoided, and the mineral consumption is reduced; the red mud quantity caused by adding a large amount of lime is directly reduced, the enrichment of valuable minerals in the red mud is promoted, and favorable conditions are created for the subsequent efficient recovery of alumina and sodium oxide in the red mud.
In summary, according to the method for producing alumina without calcium provided by this embodiment, in the production process of alumina, lime can be replaced by a calcium-free leaching additive, so as to eliminate the effect of titanium minerals on leaching of alumina, avoid or reduce the harm of lime in the process of producing alumina by using diasporite bauxite as a raw material, and make the red mud-aluminum ratio (a/S) <1.1, improve the leaching rate of alumina, make the relative leaching rate of alumina reach 97%, directly reduce the amount of red mud generated in the leaching process of alumina, and make the amount of red mud reduced by about 15% in the leaching process.
Example 2 method for producing alumina with low calcium
This example provides a method for producing alumina with low calcium content, in which a small amount of lime is added in the process of dissolving alumina, so as to dissolve alumina. Next, a specific description will be given.
Mixing the raw ore pulp and the circulating mother liquor (wherein the volume ratio of the raw ore pulp to the circulating mother liquor is 3:1), and carrying out pre-desiliconization to obtain desiliconized ore pulp; the raw ore pulp is prepared from circulating mother liquor, lime and bauxite, wherein the addition amount of the lime is 3% of the dry ore mass of the bauxite. Wherein, the preparation process of the raw ore pulp comprises the following steps: and mixing the diasporic bauxite and the circulating mother liquor in the preparation process of the raw ore pulp to obtain the raw ore pulp.
Adding circulating mother liquor into the desiliconized ore pulp, wherein the adding amount of the circulating mother liquor is 110-160m3/h, and then carrying out high-pressure digestion.
After the high-pressure elution step, the steps of dilution, sedimentation separation, decomposition, calcination, evaporation, and the like may be sequentially performed to obtain alumina.
The specific implementation processes of the pre-desiliconization, dissolution, dilution, sedimentation separation, decomposition, roasting, evaporation and other processes can refer to the description of the prior art, and are not described herein again.
The method for producing alumina with low calcium provided by the embodiment can eliminate the influence of titanium minerals on alumina dissolution by using a small amount of lime in the alumina production process, reduce the harm of lime in the process of producing alumina by using diasporic bauxite as a raw material, enable the red mud-aluminum-silicon ratio (A/S) to be less than 1.1, improve the alumina dissolution rate, enable the relative dissolution rate of alumina to reach 97%, directly reduce the generation amount of red mud in the alumina dissolution process, and enable the red mud amount in the dissolution process to be reduced by about 15%.
The method for producing the calcium-free or low-calcium alumina provided by the embodiment of the invention has obvious economic effect and good industrial application prospect.
Therefore, the present invention can effectively overcome the disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A method for calcium-free production of alumina, comprising:
mixing the calcium-free dissolving additive and the circulating mother liquor, heating to 90-100 ℃, and preserving heat for 4-6 hours to obtain additive slurry; wherein the calcium-free dissolving-out additive is composed of iron powder and ether cellulose;
mixing the additive slurry with the raw ore slurry, and carrying out pre-desiliconization to obtain desiliconized ore slurry; the raw ore pulp is prepared from circulating mother liquor and bauxite, and lime is not added in the raw ore pulp;
adding circulating mother liquor into the desiliconized ore pulp, and then carrying out high-pressure dissolution.
2. The method according to claim 1, wherein the additive is used in an amount of 0.1% of the dry ore mass of bauxite; wherein the bauxite is diasporic bauxite.
3. The method according to claim 1, wherein the ether cellulose is one or both of sodium carboxymethyl cellulose and sodium carboxymethyl starch.
4. The method according to any one of claims 1 to 3, wherein the mixing of the calcium-free dissolution additive and the recycled mother liquor is in particular:
adding circulating mother liquor into the calcium-free dissolution additive to ensure that the solid content of the additive slurry is 15-20 g/L.
5. The method according to any one of claims 1 to 3, characterized in that the addition of recycled mother liquor to the desilicated slurry is in particular:
adding circulating mother liquor into the desiliconized ore pulp to ensure that the solid content of the mixed ore pulp is 200 g/L.
6. The method according to any one of claims 1 to 3, wherein the mixing of the calcium-free dissolution additive and the recycled mother liquor and heating to 90-100 ℃ and holding for 4-6 hours results in an additive slurry comprising:
mixing the additive with a first amount of circulating mother liquor to obtain a premixed additive;
and mixing the premixed additive and a second amount of circulating mother liquor, heating to 90-100 ℃, and preserving heat for 4-6 hours to obtain the additive slurry.
7. A method for producing alumina with low calcium is characterized by comprising the following steps:
mixing the raw ore pulp and the circulating mother liquor, and carrying out pre-desiliconization to obtain desiliconized ore pulp; the raw ore pulp is prepared from circulating mother liquor, bauxite and lime, wherein the addition amount of the lime is 3% of the dry ore mass of the bauxite;
adding circulating mother liquor into the desiliconized ore pulp, and then carrying out high-pressure dissolution.
8. The method of claim 7, wherein the bauxite is diasporic type bauxite.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN102976375A (en) * | 2012-12-01 | 2013-03-20 | 中南大学 | High-pressure dissolving-out method of diasporic bauxite |
| CN102976377A (en) * | 2012-12-25 | 2013-03-20 | 中南大学 | Dissolution method of monohydrate bauxite ore |
| CN112158869A (en) * | 2020-10-16 | 2021-01-01 | 中南大学 | Method for dissolving out diasporic bauxite |
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| RU2168483C1 (en) * | 2000-03-07 | 2001-06-10 | Институт химии Коми научного центра Уральского отделения РАН | Blend for preparing structural alumina ceramic material and method of manufacturing products made thereof |
| CN1923696A (en) * | 2006-10-13 | 2007-03-07 | 中国铝业股份有限公司 | Method of dissolving high grade gibbsite type bauxite by bayer process |
| CN102489406A (en) * | 2011-11-22 | 2012-06-13 | 中国铝业股份有限公司 | Method for treating sulfur bauxite |
| CN102976375A (en) * | 2012-12-01 | 2013-03-20 | 中南大学 | High-pressure dissolving-out method of diasporic bauxite |
| CN102976377A (en) * | 2012-12-25 | 2013-03-20 | 中南大学 | Dissolution method of monohydrate bauxite ore |
| CN112158869A (en) * | 2020-10-16 | 2021-01-01 | 中南大学 | Method for dissolving out diasporic bauxite |
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