CN113955799A - Method for purifying antimony-containing arsenic trioxide - Google Patents
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- GOLCXWYRSKYTSP-UHFFFAOYSA-N arsenic trioxide Inorganic materials O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 title claims abstract description 146
- 229910052787 antimony Inorganic materials 0.000 title claims abstract description 99
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 31
- HJTAZXHBEBIQQX-UHFFFAOYSA-N 1,5-bis(chloromethyl)naphthalene Chemical compound C1=CC=C2C(CCl)=CC=CC2=C1CCl HJTAZXHBEBIQQX-UHFFFAOYSA-N 0.000 title claims abstract 19
- 239000002893 slag Substances 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 28
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003546 flue gas Substances 0.000 claims abstract description 23
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 14
- DLISVFCFLGSHAB-UHFFFAOYSA-N antimony arsenic Chemical compound [As].[Sb] DLISVFCFLGSHAB-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims description 21
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 16
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 8
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 8
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 8
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 8
- 238000000746 purification Methods 0.000 abstract description 10
- 239000006104 solid solution Substances 0.000 abstract description 5
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 229960002594 arsenic trioxide Drugs 0.000 description 75
- IKWTVSLWAPBBKU-UHFFFAOYSA-N a1010_sial Chemical compound O=[As]O[As]=O IKWTVSLWAPBBKU-UHFFFAOYSA-N 0.000 description 51
- 239000000047 product Substances 0.000 description 21
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 8
- 229910052729 chemical element Inorganic materials 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910017518 Cu Zn Inorganic materials 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910000413 arsenic oxide Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000001698 pyrogenic effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical compound [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229940000489 arsenate Drugs 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- GEYXPJBPASPPLI-UHFFFAOYSA-N manganese(III) oxide Inorganic materials O=[Mn]O[Mn]=O GEYXPJBPASPPLI-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- GNMQOUGYKPVJRR-UHFFFAOYSA-N nickel(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Ni+3].[Ni+3] GNMQOUGYKPVJRR-UHFFFAOYSA-N 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G28/00—Compounds of arsenic
- C01G28/005—Oxides; Hydroxides; Oxyacids
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B30/00—Obtaining antimony, arsenic or bismuth
- C22B30/02—Obtaining antimony
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B30/00—Obtaining antimony, arsenic or bismuth
- C22B30/04—Obtaining arsenic
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Abstract
The invention relates to a method for purifying antimony-containing arsenic trioxide, which belongs to the technical field of metallurgy and comprises the following steps: step 1, uniformly mixing crude arsenic trioxide and an antimony removal agent according to a certain proportion, putting the mixture into a tubular roasting furnace, adjusting the vacuum degree to be-0.09 MPa-0.00 MPa at the temperature of 300-600 ℃, and carrying out a physicochemical reaction on the crude arsenic trioxide, the antimony removal agent and a certain amount of air to generate roasting slag and flue gas; step 2, keeping antimony in the roasting slag, and enabling the roasting slag to enter an antimony recovery system to recover antimony; arsenic enters flue gas in a gaseous state of arsenic trioxide, the flue gas enters an arsenic recovery system to collect arsenic trioxide products, and tail gas is absorbed by alkali liquor. According to the method for purifying antimony-containing arsenic trioxide, the limitation of As-Sb solid solution can be broken at high temperature by introducing the antimony removing agent, so that arsenic is volatilized in the form of arsenic trioxide, antimony is reserved in the roasting slag, and the purification of antimony-containing arsenic trioxide is realized.
Description
Technical Field
The invention relates to a method for purifying arsenic trioxide, in particular to a method for purifying antimony-containing arsenic trioxide, which belongs to the technical field of metallurgy.
Background
Arsenic trioxide is mainly derived from byproducts produced in the gold or non-ferrous metal smelting process, most of arsenic enters smoke dust in the form of oxides under the high-temperature smelting action of oxygen enrichment or weak oxygen, then the arsenic oxide is obtained by rapidly cooling and collecting the arsenic oxide through a quenching device, and meanwhile, antimony in flue gas is precipitated together with the arsenic trioxide in the form of antimony trioxide in the cooling process, so that the arsenic trioxide obtained by collecting the flue gas contains antimony trioxide impurities. At present, arsenic-antimony pyrogenic separation is reported to mainly relate to arsenic-antimony separation in high-arsenic-antimony soot, wherein the high-arsenic-antimony soot contains 20-40% of arsenic and 20-50% of antimony; does not relate to the purification process of the antimony-containing arsenic trioxide, and the antimony content in the antimony-containing arsenic trioxide is 0.5 to 5.0 percent. Such as: the Chinese patent CN201610819292.0 reports that: grinding the high-arsenic antimony smoke dust and a vulcanizing agent, uniformly mixing, vulcanizing, roasting, volatilizing and removing arsenic under the protection of inert gas to obtain arsenic-containing smoke dust, and continuously heating to recover antimony after arsenic removal is finished; chinese patents CN201610819213.6 and CN201611163864.0 indicate: adding solid oxidant (Fe) under oxidizing atmosphere2O3Or CuO, MnO2、Mn2O3、Ni2O3One or more of the arsenic and the antimony are mixed according to a certain proportion), arsenic is finally recovered in the form of arsenate, and a small amount of antimony impurities are contained, so that the aim of completely separating arsenic from antimony is fulfilled.
The most common method for purifying crude arsenic trioxide is a pyrogenic volatilization method, but the As-Sb solid solution formed between antimony trioxide and arsenic trioxide at high temperature limits the removal of antimony trioxide from arsenic trioxide by a selective volatilization method, and the quality of the arsenic trioxide is not satisfactory.
Disclosure of Invention
The purpose of the invention is: in order to overcome the defects in the prior art, the method for purifying antimony-containing arsenic trioxide is provided, and the antimony-containing arsenic trioxide is purified by adding an antimony remover to break the limitation of As-Sb solid solution at high temperature, so that arsenic volatilizes in the form of arsenic trioxide, and antimony is retained in roasting slag.
The technical scheme for solving the technical problems is as follows:
a method for purifying antimony-containing arsenic trioxide comprises the following steps:
step 1, uniformly mixing a crude arsenic trioxide raw material and an antimony removal agent according to a certain proportion, then putting the mixture into a tubular roasting furnace, adjusting the vacuum degree to be-0.09 MPa-0.00 MPa at the temperature of 300-600 ℃, and carrying out a physicochemical reaction on the crude arsenic trioxide raw material, the antimony removal agent and a certain amount of air to generate roasting slag and flue gas;
step 2, keeping antimony in the roasting slag, and enabling the roasting slag to enter an antimony recovery system to recover antimony; arsenic enters flue gas in a gaseous state of arsenic trioxide, the flue gas enters an arsenic recovery system to collect arsenic trioxide products, and tail gas is absorbed by alkali liquor.
Furthermore, the mass ratio of the crude arsenic trioxide raw material to the antimony removal agent is 1: 0.05 to 0.2.
Furthermore, the antimony removing agent is prepared by mixing calcium oxide or calcium carbonate with copper sulfate or ferric sulfate according to a certain proportion.
Further, the antimony removing agent comprises the following components in percentage by mass: 5-9 parts of calcium oxide and 1-3 parts of copper sulfate.
Further, the antimony removing agent comprises the following components in percentage by mass: 8-12 parts of calcium oxide and 1-3 parts of ferric sulfate.
Further, the antimony removing agent comprises the following components in percentage by mass: 10-17 parts of calcium carbonate and 1-3 parts of copper sulfate.
Further, the antimony removing agent comprises the following components in percentage by mass: 15-21 parts of calcium carbonate and 1-3 parts of ferric sulfate.
Further, As in the crude arsenic trioxide feedstock2O3And the content of Sb is: as2O3≥80％，Sb≤5.0％。
Further, As in the arsenic trioxide product2O3And the content of Sb is: as2O3More than or equal to 99.5 percent and Sb less than or equal to 0.10 percent; the contents of As and Sb in the roasting slag are As follows: as is less than or equal to 4.00 percent and Sb is more than or equal to 5.00 percent.
The invention has the beneficial effects that: the restriction of As-Sb solid solution can be broken at high temperature by introducing the antimony removal agent, so that arsenic is volatilized in the form of arsenic trioxide, antimony is reserved in the roasting slag, the purification of antimony-containing arsenic trioxide is realized, and the antimony removal agent has wide raw material source and low cost; the purification method has strong adaptability and can meet the requirements of As2O3And Sb content is As2O3Purification of crude arsenic trioxide raw material with Sb content not more than 80% and Sb content not more than 5.0%, and the produced arsenic trioxide product contains As2O3And Sb in an amount of As2O399.5% or more and 0.10% or less Sb, which meets the national standard GB 26721-2O3The requirement of-1 is that the arsenic recovery rate is more than 98.0 percent, the As content of the roasting slag is less than or equal to 4.00 percent, and the Sb content of the roasting slag is more than or equal to 5.00 percent, thereby meeting the production requirement.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the accompanying fig. 1, which is provided by way of example only to illustrate the present invention and not to limit the scope of the present invention.
Selecting 4 groups of As2O3And (3) carrying out a purification process on a crude arsenic trioxide raw material with the content of more than or equal to 80 percent and the Sb content of less than or equal to 5.0 percent, and analyzing the obtained arsenic trioxide product.
Example 1
A method for purifying antimony-containing arsenic trioxide comprises the following steps:
step 1, mixing a raw material 1 of crude arsenic trioxide and an antimony removal agent 1 according to the ratio of 1: 0.1, putting into a tubular roasting furnace, wherein the antimony removing agent 1 is prepared by mixing 8 parts of calcium oxide and 2 parts of copper sulfate according to mass fraction, regulating the vacuum degree to be-0.09 MPa-0.00 MPa at the temperature of 300-600 ℃, and carrying out physicochemical reaction on the crude arsenic trioxide raw material 1, the antimony removing agent 1 and a certain amount of air to generate roasting slag and flue gas;
step 2, keeping antimony in the roasting slag, and enabling the roasting slag to enter an antimony recovery system to recover antimony; arsenic enters flue gas in a gaseous state of arsenic trioxide, the flue gas enters an arsenic recovery system to collect an arsenic trioxide product 1, and tail gas is absorbed by alkali liquor.
The crude arsenic trioxide raw material 1 and the arsenic trioxide product 1 were analyzed and compared before and after, and the results are shown in tables 1 and 2:
TABLE 1 crude arsenic trioxide feedstock 1 principal chemical element analysis%
| As2O3 | Cl | Fe | Pb | Sb | Bi | Cu | Zn | S |
| 89.74 | 0.090 | 0.023 | 0.30 | 0.95 | 0.011 | 0.009 | 0.060 | 1.14 |
TABLE 2 arsenic trioxide product 1 and the roasting slag analysis of the main chemical elements%
As in the produced arsenic trioxide product 12O3And Sb in an amount of As2O399.57 percent of the total Sb content and 0.081 percent of the total Sb content, which conforms to the national standard GB 26721-2O3The requirement of-1 is met, the As content of the roasting slag is 3.25 percent, the Sb content is 8.32 percent, the arsenic recovery rate reaches 98.20 percent, and the production requirement is met.
Example 2
A method for purifying antimony-containing arsenic trioxide comprises the following steps:
step 1, mixing a raw material 2 of crude arsenic trioxide and an antimony removal agent 2 according to the ratio of 1: 0.12, then putting into a tubular roasting furnace, wherein the antimony removing agent 2 is prepared by mixing 10 parts of calcium oxide and 2 parts of ferric sulfate according to the mass fraction, adjusting the vacuum degree to be-0.09 MPa-0.00 MPa at the temperature of 300-600 ℃, and performing physicochemical reaction on the crude arsenic trioxide raw material 2, the antimony removing agent 2 and a certain amount of air to generate roasting slag and flue gas;
step 2, keeping antimony in the roasting slag, and enabling the roasting slag to enter an antimony recovery system to recover antimony; arsenic enters the flue gas in a gaseous state of arsenic trioxide, the flue gas enters an arsenic recovery system to collect an arsenic trioxide product 2, and tail gas is absorbed by alkali liquor.
The crude arsenic trioxide feedstock 2 and the arsenic trioxide product 2 were analyzed and compared before and after, and the results are shown in tables 3 and 4:
TABLE 3 crude arsenic trioxide feedstock 2 principal chemical element analysis%
TABLE 4 arsenic trioxide product 2 and torrefaction slag analysis of key chemical elements%
As in the produced arsenic trioxide product 22O3And Sb in an amount of As2O399.62 percent and 0.071 percent of Sb, and meets the national standard GB 26721-2O3The requirement of-1 is met, the As content of the roasting slag is 2.58 percent, the Sb content is 8.89 percent, the arsenic recovery rate reaches 98.22 percent, and the production requirement is met.
Example 3
A method for purifying antimony-containing arsenic trioxide comprises the following steps:
step 1, mixing a raw material 3 of crude arsenic trioxide and an antimony removal agent 3 according to the ratio of 1: 0.15, then putting into a tubular roasting furnace, wherein the antimony removing agent 3 is prepared by mixing 12 parts of calcium carbonate and 3 parts of copper sulfate according to the mass fraction, and regulating the vacuum degree to be-0.09 MPa-0.00 MPa at the temperature of 300-600 ℃, and the crude arsenic trioxide raw material 3, the antimony removing agent 3 and a certain amount of air are subjected to physicochemical reaction to generate roasting slag and flue gas;
step 2, keeping antimony in the roasting slag, and enabling the roasting slag to enter an antimony recovery system to recover antimony; arsenic enters the flue gas in a gaseous state of arsenic trioxide, the flue gas enters an arsenic recovery system to collect an arsenic trioxide product 3, and tail gas is absorbed by alkali liquor.
The crude arsenic trioxide feedstock 3 and the arsenic trioxide product 3 were analyzed and compared before and after, and the results are shown in tables 5 and 6:
TABLE 5 crude arsenic trioxide feedstock 3 principal chemical element analysis%
| As2O3 | Cl | Fe | Pb | Sb | Bi | Cu | Zn | S |
| 90.24 | 0.082 | 0.029 | 0.48 | 2.01 | 0.010 | 0.007 | 0.048 | 0.59 |
TABLE 6 analysis of the main chemical elements of the arsenic trioxide product 3 and of the roasting slag%
As in the produced arsenic trioxide product 32O3And Sb in an amount of As2O399.62 percent and 0.076 percent of Sb, and meets the national standard GB 26721-2O3The requirement of-1 is met, the As content of the roasting slag is 1.96%, the Sb content is 9.35%, the arsenic recovery rate reaches 98.21%, and the production requirement is met.
Example 4
A method for purifying antimony-containing arsenic trioxide comprises the following steps:
step 1, mixing a crude arsenic trioxide raw material 4 and an antimony removal agent 4 according to the ratio of 1: 0.2, putting into a tubular roasting furnace, wherein the antimony removing agent 4 is prepared by mixing 18 parts of calcium carbonate and 2 parts of ferric sulfate according to mass fraction, regulating the vacuum degree to be-0.09 MPa-0.00 MPa at the temperature of 300-600 ℃, and carrying out physicochemical reaction on the crude arsenic trioxide raw material 4, the antimony removing agent 4 and a certain amount of air to generate roasting slag and flue gas;
step 2, keeping antimony in the roasting slag, and enabling the roasting slag to enter an antimony recovery system to recover antimony; arsenic enters the flue gas in a gaseous state of arsenic trioxide, the flue gas enters an arsenic recovery system to collect an arsenic trioxide product 4, and tail gas is absorbed by alkali liquor.
The crude arsenic trioxide feedstock 4 and the arsenic trioxide product 4 were analyzed and compared before and after, and the results are shown in tables 7 and 8:
TABLE 7 crude arsenic trioxide feedstock 4 principal chemical element analysis%
| As2O3 | Cl | Fe | Pb | Sb | Bi | Cu | Zn | S |
| 85.12 | 0.047 | 0.082 | 0.86 | 2.97 | 0.015 | 0.002 | 0.089 | 1.58 |
TABLE 8 analysis of the main chemical elements of the arsenic trioxide product 4 and of the roasting slag%
As in the produced arsenic trioxide product 42O3And Sb in an amount of As2O399.68 percent of Sb, 0.052 percent of Sb, and meets the national standard GB 26721-2O3The requirement of-1 is met, the As content of the roasting slag is 3.05 percent, the Sb content is 8.29 percent, the arsenic recovery rate reaches 98.24 percent, and the production requirement is met.
According to the analysis result of the data, the As in four groups of arsenic trioxide products2O3And Sb content reaches As2O3Not less than 99.5 percent and Sb not more than 0.10 percent, which all conform to the national standard GB 26721-2O3The requirement is-1, the As content of the roasting slag is less than or equal to 4.00 percent, the Sb content is more than or equal to 5.00 percent, and the arsenic recovery rate reaches more than 98.0 percent.
According to the purification method, the antimony removal agent is introduced, so that the limitation of As-Sb solid solution can be broken at high temperature, arsenic is volatilized in the form of arsenic trioxide, antimony is reserved in the roasting slag, purification of antimony-containing arsenic trioxide is realized, and the antimony removal agent is wide in raw material source and low in cost; the purification method has strong adaptability and can meet the requirements of As2O3And Sb content is As2O3The purification of the crude arsenic trioxide raw material with the content of Sb being more than or equal to 80 percent and less than or equal to 5.0 percent meets the production requirement.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for purifying antimony-containing arsenic trioxide is characterized by comprising the following steps: the method comprises the following steps:
step 1, uniformly mixing a crude arsenic trioxide raw material and an antimony removal agent according to a certain proportion, then putting the mixture into a tubular roasting furnace, adjusting the vacuum degree to be-0.09 MPa-0.00 MPa at the temperature of 300-600 ℃, and carrying out a physicochemical reaction on the crude arsenic trioxide raw material, the antimony removal agent and a certain amount of air to generate roasting slag and flue gas;
step 2, keeping antimony in the roasting slag, and enabling the roasting slag to enter an antimony recovery system to recover antimony; arsenic enters flue gas in a gaseous state of arsenic trioxide, the flue gas enters an arsenic recovery system to collect arsenic trioxide products, and tail gas is absorbed by alkali liquor.
2. The method of claim 1, wherein the antimony-containing arsenic trioxide comprises: the mass ratio of the crude arsenic trioxide raw material to the antimony removal agent is 1: 0.05 to 0.2.
3. The method of claim 1, wherein the antimony-containing arsenic trioxide comprises: the antimony removing agent is prepared by mixing calcium oxide or calcium carbonate and copper sulfate or ferric sulfate according to a certain proportion.
4. The method of claim 3, wherein the antimony-containing arsenic trioxide comprises: the antimony removing agent comprises the following components in percentage by mass: 5-9 parts of calcium oxide and 1-3 parts of copper sulfate.
5. The method of claim 3, wherein the antimony-containing arsenic trioxide comprises: the antimony removing agent comprises the following components in percentage by mass: 8-12 parts of calcium oxide and 1-3 parts of ferric sulfate.
6. The method of claim 3, wherein the antimony-containing arsenic trioxide comprises: the antimony removing agent comprises the following components in percentage by mass: 10-17 parts of calcium carbonate and 1-3 parts of copper sulfate.
7. The method of claim 3, wherein the antimony-containing arsenic trioxide comprises: the antimony removing agent comprises the following components in percentage by mass: 15-21 parts of calcium carbonate and 1-3 parts of ferric sulfate.
8. The method of claim 1, wherein the antimony-containing arsenic trioxide comprises: as in the crude arsenic trioxide raw material2O3And the content of Sb is: as2O3≥80％，Sb≤5.0％。
9. The method of claim 8, wherein the antimony-containing arsenic trioxide comprises: as in the arsenic trioxide product2O3And the content of Sb is: as2O3More than or equal to 99.5 percent and Sb less than or equal to 0.10 percent; the contents of As and Sb in the roasting slag are As follows: as is less than or equal to 4.00 percent and Sb is more than or equal to 5.00 percent.
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