CN114669393B - Comprehensive recycling process for chemical by-product iron mud - Google Patents
Comprehensive recycling process for chemical by-product iron mud Download PDFInfo
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- CN114669393B CN114669393B CN202210340946.7A CN202210340946A CN114669393B CN 114669393 B CN114669393 B CN 114669393B CN 202210340946 A CN202210340946 A CN 202210340946A CN 114669393 B CN114669393 B CN 114669393B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 179
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000000126 substance Substances 0.000 title claims abstract description 35
- 239000006227 byproduct Substances 0.000 title claims abstract description 30
- 238000004064 recycling Methods 0.000 title claims abstract description 25
- 239000012141 concentrate Substances 0.000 claims abstract description 134
- 238000007885 magnetic separation Methods 0.000 claims abstract description 97
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000005188 flotation Methods 0.000 claims abstract description 46
- 238000000227 grinding Methods 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 14
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- 150000002191 fatty alcohols Chemical class 0.000 claims description 10
- XJWSAJYUBXQQDR-UHFFFAOYSA-M dodecyltrimethylammonium bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)C XJWSAJYUBXQQDR-UHFFFAOYSA-M 0.000 claims description 9
- 239000003245 coal Substances 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 8
- 239000011707 mineral Substances 0.000 claims description 8
- 239000003112 inhibitor Substances 0.000 claims description 7
- 229920002472 Starch Polymers 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 235000019698 starch Nutrition 0.000 claims description 6
- 239000008107 starch Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 14
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000009776 industrial production Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052595 hematite Inorganic materials 0.000 description 3
- 239000011019 hematite Substances 0.000 description 3
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 3
- 239000006148 magnetic separator Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012265 solid product Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- FECNOIODIVNEKI-UHFFFAOYSA-N 2-[(2-aminobenzoyl)amino]benzoic acid Chemical class NC1=CC=CC=C1C(=O)NC1=CC=CC=C1C(O)=O FECNOIODIVNEKI-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 238000009920 food preservation Methods 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- SJWFXCIHNDVPSH-UHFFFAOYSA-N octan-2-ol Chemical compound CCCCCCC(C)O SJWFXCIHNDVPSH-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a comprehensive recycling process of chemical by-product iron mud, which comprises the following steps: (1) Washing the iron mud to obtain washed rough concentrate and washed tailings, and magnetically separating the washed rough concentrate to obtain magnetic concentrate A and first magnetic tailings; (2) Carrying out reduction roasting on the first magnetic separation tailings to obtain roasted ores, grinding the roasted ores, and carrying out magnetic separation to obtain magnetic separation concentrate B and second magnetic separation tailings; (3) Combining the magnetic concentrate A and the magnetic concentrate B, grinding and magnetically separating to obtain magnetic concentrate C and third magnetic tailings; performing reverse flotation and impurity removal on the magnetic concentrate C to obtain reverse flotation concentrate containing magnetite concentrate and reverse flotation tailings; the second magnetic separation tailings and the third magnetic separation tailings are combined to be used as the iron-containing raw material for cement production. The method has the advantages of simple and convenient process flow and strong practicability, is suitable for industrial production, has high total recovery rate of the obtained magnetite concentrate, and effectively reduces the cost of adopting natural iron ore as the raw material of the high-purity magnetite concentrate.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of solid waste, and particularly relates to a comprehensive recycling process of chemical by-product iron mud.
Background
The chemical by-product iron mud is the product of oxidized iron powder used as a reducing agent in the production of dye intermediates. The main component of the chemical by-product iron mud is iron oxide, mainly Fe 3 O 4 In the form of Fe possibly mixed with 2 O 3 FeO, and a small amount of unreacted scrap iron, the iron content is high. The earliest more common disposal methods were stockpiling and landfilling. Because the iron mud has finer granularity and contains toxic substances, long-term stacking not only occupies land, but also can cause air and groundwater pollution.
The utilization research of the iron mud is developed from the 80 s of the 20 th century in China, and the iron mud is recovered and used for steel smelting. Subsequently, in research on recycling of iron mud, new methods and fine chemical products with high added values are continuously developed, and the method goes deep into the environmental protection fields such as sewage treatment and the like and the new material field.
The high-purity iron concentrate is a novel functional material with great development potential, and is an important raw material source of a novel iron-based mineral material; the method is mainly used for powder metallurgy, production of metallized pellets and magnetic materials, and can also be used in the fields of chemical industry, environmental protection, food preservation, sewage treatment and the like. High purity iron concentrates generally refer broadly to iron concentrates having an iron grade of greater than 71% and a silica content of less than 2%. At present, the high-purity magnetite concentrate is generally obtained by concentrating natural iron ore through pre-dressing and then further removing impurities, but the natural iron ore has higher cost.
Disclosure of Invention
The invention aims to overcome the technical defects, provide a comprehensive recycling process of chemical by-product iron mud, and solve the technical problems that the chemical by-product iron mud is difficult to effectively recycle and the cost of natural iron ore serving as a raw material is high in the prior art.
In order to achieve the technical purpose, the technical scheme of the comprehensive recycling process is as follows:
the method comprises the following steps:
(1) Washing the iron mud to obtain washed rough concentrate and washed tailings, and magnetically separating the washed rough concentrate to obtain magnetic concentrate A and first magnetic tailings;
(2) Carrying out reduction roasting on the first magnetic separation tailings to obtain roasted ores, grinding the roasted ores, and carrying out magnetic separation to obtain magnetic separation concentrate B and second magnetic separation tailings;
(3) Combining the magnetic concentrate A and the magnetic concentrate B, grinding and magnetically separating to obtain magnetic concentrate C and third magnetic tailings; performing reverse flotation and impurity removal on the magnetic concentrate C to obtain reverse flotation concentrate containing magnetite concentrate and reverse flotation tailings; the second magnetic separation tailings and the third magnetic separation tailings are combined to be used as the iron-containing raw material for cement production.
In the step (1), washing is carried out for 1-2 times, and the washed rough concentrate is subjected to a magnetic separation process for 1-2 times.
Further, in the step (1), the magnetic field intensity of the magnetic separation is 50-200 KA/m.
Further, in the step (2), the conditions of the reduction roasting are as follows: roasting temperature is 750-950 ℃, roasting time is 70-150 min, and mineral coal ratio is 8-13.
Further, in the step (2), the fineness of the roasted ore grinding is controlled to be-0.074 mm, the ratio of the fineness to the fineness is 75-90%, and the magnetic separation magnetic field strength is 50-200 KA/m.
Further, in the step (3), the grinding fineness is controlled to be-0.037 mm, the ratio is 75-85%, and the magnetic separation magnetic field strength is 50-200 KA/m.
Further, reverse flotation includes one rougher, two to three beneficiations.
Further, the reverse flotation process parameters are as follows: sodium carbonate is adopted to control the pH value to be 7-10 during reverse flotation; the dosage of the inhibitor starch is 100-300 g/t; the collector is a mixture of dodecyl trimethyl ammonium bromide and fatty alcohol, and the dosage is 30-200 g/t.
Further, the mass ratio of the dodecyl trimethyl ammonium bromide to the fatty alcohol is (5-6): (5-4).
Further, the TFe content in the iron mud is 60-61%; the obtained reverse flotation concentrate is high-purity magnetite concentrate with TFe content of 71.49-71.82%, and the reverse flotation tailings are common magnetite concentrate with TFe content of 61.57-64.25%.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts a magnetic separation-roasting-floatation combined process, utilizes the characteristic of high content of magnetite in the iron mud which is a chemical byproduct, adopts magnetic separation to recycle the original magnetite in the iron mud, reduces hematite in the magnetic separation tailings into magnetite by reduction roasting, recycles magnetite in roasted ore by a magnetic separation method, and removes impurities by grinding, re-magnetic separation and reverse floatation of the obtained magnetic separation concentrate, wherein the obtained reverse floatation concentrate and the reverse floatation tailings both contain magnetite concentrate, and the total recycling rate is high (the total recycling rate of the magnetite concentrate is more than 83 percent); the magnetic separation tailings are used as an iron-containing raw material for cement production. The invention has simple process flow and strong practicability, and is suitable for industrial production.
2. The invention processes the chemical by-product iron mud through a common beneficiation method to finally obtain the high-purity magnetite concentrate and the common magnetite concentrate, effectively reduces the cost of adopting natural iron ore as the raw material of the high-purity magnetite concentrate, and the tailings can be used as the iron-containing raw material for the production of cement factories. The invention can realize the comprehensive recycling of the iron mud, improves the overall economic benefit of the iron mud utilization, and has practical significance for environmental protection.
Drawings
FIG. 1 is a flow chart of a comprehensive utilization process of the chemical by-product iron mud.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a comprehensive recycling process of chemical by-product iron mud, which can obtain high-purity magnetite concentrate and common magnetite concentrate through magnetic separation, reduction roasting and floatation, and the magnetic separation tailings are used as iron-containing raw materials for cement production, so that the comprehensive recycling of resources is realized, the overall economic benefit is improved, and the environment-friendly benefit is achieved.
Referring to fig. 1, the comprehensive recovery process flow of the invention fully utilizes the physical and surface physical and chemical property differences among chemical industry iron mud constituent components, specifically sorts chemical industry byproduct iron mud and comprehensively recycles the steps of the process comprising:
1) Washing the chemical byproduct iron mud to obtain washed rough concentrate and washed tailings, and carrying out weak magnetic separation on the washed rough concentrate to obtain magnetic separation concentrate A and first magnetic separation tailings; wherein, the grade of the chemical industry byproduct iron mud TFe (total iron) is 60 percent or more, the washing is carried out for 1 to 2 times, and the washing rough concentrate is subjected to 1 to 2 times of weak magnetic separation process; the intensity of the weak magnetic separation magnetic field is 50-200 KA/m;
2) Reducing and roasting the first magnetic separation tailings obtained in the step 1), wherein the reducing and roasting temperature is 700-950 ℃, the roasting time is 70-150 min, and the mineral coal ratio is 8-13, wherein the coal is pulverized coal; reducing hematite in the ore to magnetite, grinding the roasted ore, and carrying out low-intensity magnetic separation II to obtain magnetic separation concentrate B and second magnetic separation tailings; the fineness of the ore grinding of the roasted ore is controlled to be-0.074 mm and accounts for 75-90 percent; the intensity of the weak magnetic separation magnetic field is 50-200 KA/m;
3) Combining the magnetic concentrate A and the magnetic concentrate B obtained in the step 1) and the step 2), grinding and magnetically separating III to obtain magnetic concentrate C and third magnetic tailings, and removing impurities from the magnetic concentrate C by reverse flotation, wherein the obtained reverse flotation concentrate is high-purity magnetite concentrate, and the reverse flotation tailings are common magnetite concentrates; the fineness of grinding is controlled to be-0.037 mm, the proportion is 75-85%, and the intensity of the weak magnetic separation magnetic field is 50-200 KA/m; in the high-purity magnetite concentrate, the TFe content is more than 71%, and in the common magnetite concentrate, the TFe content is more than 61.5%.
4) Combining the magnetic separation tailings (the second magnetic separation tailings and the third magnetic separation tailings) obtained in the step 2) and the step 3) to be used as an iron-containing raw material for cement production; thus completing the comprehensive recycling of the chemical by-product iron mud.
According to the above scheme, in the step 3), the impurities are removed through a reverse flotation process of one roughing and two to three times of concentration, the foam product is common magnetite concentrate, and the product in the tank is high-purity magnetite concentrate. The reverse flotation process parameters of the magnetic concentrate are as follows: sodium carbonate is adopted to control the pH value to be 7-10 during reverse flotation; the dosage of the inhibitor starch is 100-300 g/t; the collecting agent is compounded by dodecyl trimethyl ammonium bromide and fatty alcohol according to any proportion, and the preferable mass ratio is (5-6): (5-4) the amount is 30-200 g/t, the fatty alcohol is a straight chain or branched chain fatty alcohol with 5-9 carbon atoms, preferably sec-octanol; the inhibitor and collector amounts in the present invention are relative to the concentrate C.
The invention is further illustrated by the following specific examples. Wherein:
the selected chemical byproduct iron mud comes from a certain place in Hubei, is the oxidized product of iron powder used as a reducing agent when reducing nitro into amino in the production process of an organic intermediate, and has TFe of 60.42 percent. Iron powder is oxidized and a large amount of industrial waste residue, namely iron mud, is produced.
Selecting the chemical by-product iron mud sample as a raw material, separating the sample, bagging, and taking 1kg of the sample per bag and one bag per test.
Example 1
1) 1kg of the iron mud raw material is subjected to water washing for 1 time, organic matters contained in the iron mud raw material are removed, water washing tailings and water washing rough concentrate are obtained, and the TFe content of the obtained water washing rough concentrate iron-containing solid product is 62.75%.
2) Carrying out weak magnetic separation I on the water-washed rough concentrate obtained in the step 1) to obtain magnetic separation concentrate A and first magnetic separation tailings; the magnetic field strength of the low-intensity magnetic separator is 100KA/m. The first magnetic separation tailings are subjected to reduction roasting for 90min at 800 ℃ under the condition of a mineral coal ratio of 10, the obtained product is subjected to ore grinding, the granularity of the ground product is-0.074 mm and accounts for 85%, and then the low-intensity magnetic separation II is carried out under the condition that the magnetic field strength is 100KA/m, so that magnetic separation concentrate B and second magnetic separation tailings are obtained.
3) Combining the magnetic concentrate B obtained by the low-intensity magnetic separation II in the step 2) with the magnetic concentrate A obtained by the low-intensity magnetic separation I, grinding again, and carrying out low-intensity magnetic separation III after grinding to obtain magnetic concentrate C and third magnetic tailings; the fineness of the ore is-0.037 mm, the proportion is 82.3%, and the magnetic separation strength of the weak magnetic separation III is 150KA/m. Step 2) and step 3) because the industrial iron tailings can be used as raw materials for cement production, the obtained magnetic tailings can be used as iron-containing raw materials for cement production. The obtained magnetic concentrate C is subjected to reverse flotation, impurities are removed through a reverse flotation process of primary roughing and tertiary concentration, a foam product is common magnetite concentrate, and a product in a tank is high-purity magnetite concentrate. The reverse flotation process parameters of the magnetic concentrate are as follows: sodium carbonate is adopted to control the pH value to 9 during reverse flotation; the dosage of the inhibitor starch is 250g/t; the collector is compounded by dodecyl trimethyl ammonium bromide and fatty alcohol in a ratio of 6:4, and the dosage is 75g/t. The TFe content of the obtained common magnetite concentrate is 63.22%, the recovery rate is 29.17%, the TFe content of the high-purity magnetite concentrate is 71.68%, and the recovery rate is 55.83%.
Example 2
1) And (3) washing 1kg of the iron mud raw material for 2 times to remove organic matters contained in the iron mud raw material to obtain washed tailings and washed rough concentrate, wherein the TFe content of the obtained washed rough concentrate iron-containing solid product is 63.52%.
2) Carrying out weak magnetic separation I on the water-washed rough concentrate obtained in the step 1) to obtain magnetic separation concentrate A and first magnetic separation tailings; the magnetic field strength of the low-intensity magnetic separator is 80KA/m. The first magnetic separation tailings are subjected to reduction roasting for 110min at 850 ℃ under the condition of a mineral coal ratio of 11, the obtained product is subjected to ore grinding, the granularity of the ground product is-0.074 mm and the ratio is 88.6%, and then the weak magnetic separation II is carried out under the condition that the magnetic field strength is 80KA/m, so that magnetic separation concentrate B and second magnetic separation tailings are obtained.
3) Combining the magnetic concentrate B obtained by the low-intensity magnetic separation II in the step 2) with the magnetic concentrate A obtained by the low-intensity magnetic separation I, grinding again, and carrying out low-intensity magnetic separation III after grinding to obtain magnetic concentrate C and third magnetic tailings; the fineness of the ore is-0.037 mm, the proportion is 80.1%, and the magnetic separation strength of the weak magnetic separation III is 180KA/m. The magnetic separation tailings obtained in the step 2) and the step 3) are used as iron-containing raw materials for cement production. The obtained magnetic concentrate C is subjected to reverse flotation, impurities are removed through a reverse flotation process of primary roughing and tertiary concentration, a foam product is common magnetite concentrate, and a product in a tank is high-purity magnetite concentrate. The reverse flotation process parameters of the magnetic concentrate are as follows: sodium carbonate is adopted to control the pH value to 9.5 during reverse flotation; the dosage of the inhibitor starch is 200g/t; the collector is compounded by dodecyl trimethyl ammonium bromide and fatty alcohol in a ratio of 6:4, and the dosage is 120g/t. The TFe content of the obtained common magnetite concentrate is 61.57%, the recovery rate is 31.14%, the TFe content of the high-purity magnetite concentrate is 71.82%, and the recovery rate is 51.86%.
Example 3
1) And (3) washing 1kg of the iron mud raw material for 2 times to remove organic matters contained in the iron mud raw material to obtain washed tailings and washed rough concentrate, wherein the TFe content of the obtained washed rough concentrate iron-containing solid product is 63.52%.
2) Carrying out weak magnetic separation I on the water-washed rough concentrate obtained in the step 1) to obtain magnetic separation concentrate A and first magnetic separation tailings; the magnetic field strength of the low-intensity magnetic separator is 120KA/m. The first magnetic separation tailings are subjected to reduction roasting for 110min at 900 ℃ under the condition of a mineral coal ratio of 10, the obtained product is subjected to ore grinding, the granularity of the ground product is-0.074 mm and the proportion is 86.3%, and then the weak magnetic separation II is carried out under the condition that the magnetic field strength is 120KA/m, so that magnetic separation concentrate B and second magnetic separation tailings are obtained.
3) Combining the magnetic concentrate B obtained by the low-intensity magnetic separation II in the step 2) with the magnetic concentrate A obtained by the low-intensity magnetic separation I, grinding again, and carrying out low-intensity magnetic separation III after grinding to obtain magnetic concentrate C and third magnetic tailings; the fineness of the ore is-0.037 mm with the proportion of 83.2%, and the magnetic separation strength of the weak magnetic separation III is 200KA/m. The magnetic separation tailings obtained in the step 2) and the step 3) are used as iron-containing raw materials for cement production. The obtained magnetic concentrate C is subjected to reverse flotation, impurities are removed through a reverse flotation process of primary roughing and secondary concentration, a foam product is common magnetite concentrate, and a product in a tank is high-purity magnetite concentrate. The reverse flotation process parameters of the magnetic concentrate are as follows: sodium carbonate is adopted to control the pH value to 9.2 during reverse flotation; the dosage of the inhibitor starch is 180g/t; the collector is compounded by dodecyl trimethyl ammonium bromide and fatty alcohol in a ratio of 5:5, and the dosage is 90g/t. The TFe content of the obtained common magnetite concentrate is 64.25%, the recovery rate is 27.41%, the TFe content of the high-purity magnetite concentrate is 71.49%, and the recovery rate is 59.59%.
Comparative example 1
The ore grinding step was omitted in each step, and the other conditions were the same as in example 3.
Through tests, the recovery rate of the obtained common magnetite concentrate is 36.52%, the recovery rate of the TFe of the high-purity magnetite concentrate is 18.13%, and the recovery rate of the high-purity magnetite concentrate is obviously lower than that of the example 3, because the comparative example 1 is not subjected to ore grinding, the dissociation degree of magnetite monomers is very low, and the subsequent magnetic separation and purification process is not facilitated.
Comparative example 2
The collector was dodecyl trimethyl ammonium bromide alone, and the other conditions were the same as in example 3.
Through tests, the TFe content of the high-purity magnetite concentrate obtained by reverse flotation is 65.28%, the grade requirement of the high-purity magnetite concentrate cannot be met, and as can be seen from comparative example 2 and example 3, the compound collector disclosed by the invention is beneficial to improving the reverse flotation effect, effectively reducing the impurity content and improving the grade of the magnetite concentrate.
Comparative example 3
The magnetic field strength was increased beyond the above range during magnetic separation, and the other conditions were the same as in example 3.
Through tests, the TFe content of the high-purity magnetite concentrate obtained by reverse flotation is 64.53%, and the grade requirement of the high-purity magnetite concentrate cannot be met, because the magnetic field strength is increased, part of gangue minerals and intergrowth are entrained in the magnetic separation process and enter the magnetic separation concentrate, and the subsequent flotation separation is not facilitated.
Comparative example 4
The flotation was performed only once for roughing, and the other conditions were the same as in example 3.
Through tests, the TFe content of the high-purity magnetite concentrate obtained by reverse flotation is 65.79%, and the grade requirement of the high-purity magnetite concentrate cannot be met, because the impurities in the magnetite concentrate cannot be effectively removed by one-time reverse flotation roughing.
The invention discloses a comprehensive recycling process of chemical by-product iron mud, which comprises the following steps: 1) Washing the chemical by-product iron mud with water and then carrying out low-intensity magnetic separation on the washed chemical by-product iron mud; 2) Reducing and roasting tailings obtained by magnetic separation I, reducing hematite in the tailings into magnetite, grinding roasted ores, and then, feeding the roasted ores into a low-intensity magnetic separation II, and recovering the magnetite; 3) Combining the low-intensity magnetic concentrate obtained in the step 1) and the step 2), grinding to further dissociate the magnetite from the monomer, performing low-intensity magnetic separation III, performing reverse flotation on the obtained magnetic concentrate, removing impurities in the obtained magnetic concentrate to obtain high-purity magnetite concentrate, wherein reverse flotation tailings are common magnetite concentrate and can be used for steel smelting; 4) And (3) combining the magnetic separation tailings obtained in the step (2) and the step (3) to be used as an iron-containing raw material for cement plant production. The process is simple and convenient, has strong practicability, can obtain high-purity magnetite concentrate (TFe content is more than 71 percent, recovery rate is 51.5-60 percent) and common magnetite concentrate (61.5-65 percent, recovery rate is 27-32 percent), total recovery rate is more than 83 percent (83-87 percent), and the separated tailings can be used as an iron-containing raw material for cement production, thereby being beneficial to realizing comprehensive utilization rate of iron mud resources, obtaining high-added-value products and having environmental benefit and economic benefit.
According to the invention, the chemical by-product iron mud is used as a raw material, impurities in the chemical iron mud are removed through magnetic separation, roasting and floatation methods, and finally high-purity magnetite concentrate and common magnetite concentrate products are obtained, and the obtained magnetic separation tailings can be used as an iron-containing raw material for cement production, so that the comprehensive recycling of the iron mud is realized. The preparation of the high-purity magnetite from the iron mud improves the added value of the utilization of the iron mud, and provides a new thought and direction for the recycling of the iron mud. The invention can realize the sustainable development of the chemical industry field while realizing the recycling and high-value utilization of the iron mud and having environmental benefits.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (8)
1. The comprehensive recycling process of the chemical by-product iron mud is characterized by comprising the following steps of:
(1) Washing the iron mud to obtain washed rough concentrate and washed tailings, and carrying out low-intensity magnetic separation on the washed rough concentrate to obtain magnetic concentrate A and first magnetic tailings;
(2) Carrying out reduction roasting on the first magnetic separation tailings to obtain roasted ores, grinding the roasted ores, and carrying out low-intensity magnetic separation to obtain magnetic separation concentrate B and second magnetic separation tailings;
(3) Combining the magnetic concentrate A and the magnetic concentrate B, grinding and carrying out weak magnetic separation to obtain magnetic concentrate C and third magnetic tailings; performing reverse flotation and impurity removal on the magnetic concentrate C to obtain reverse flotation concentrate containing magnetite concentrate and reverse flotation tailings; combining the second magnetic separation tailings and the third magnetic separation tailings to be used as an iron-containing raw material for cement production;
the intensity of the weak magnetic separation magnetic field is 50-200 KA/m;
the reverse flotation process parameters are as follows: sodium carbonate is adopted to control the pH value to be 7-10 during reverse flotation; the dosage of the inhibitor starch is 100-300 g/t; the collector is a mixture of dodecyl trimethyl ammonium bromide and fatty alcohol, and the dosage is 30-200 g/t.
2. The process for comprehensively recycling the chemical byproduct iron mud according to claim 1, wherein in the step (1), washing is performed for 1-2 times, and the washed rough concentrate is subjected to 1-2 times of magnetic separation and separation processes.
3. The process for comprehensive recycling of the chemical byproduct iron mud according to claim 1, wherein in the step (2), the conditions of the reduction roasting are as follows: roasting temperature is 750-950 ℃, roasting time is 70-150 min, and mineral coal ratio is 8-13.
4. The process for comprehensively recycling the chemical byproduct iron mud according to claim 1, wherein in the step (2), the fineness of the roasted ore grinding is controlled to be-0.074 mm, and the proportion of the roasted ore grinding is 75-90%.
5. The process for comprehensively recycling the chemical byproduct iron mud according to claim 1, wherein in the step (3), the grinding fineness is controlled to be-0.037 and mm accounting for 75-85 percent.
6. The process for comprehensive recycling of the chemical byproduct iron mud according to claim 1, wherein the reverse flotation comprises one roughing and two to three fine selections.
7. The comprehensive recycling process of the chemical byproduct iron mud according to claim 1, which is characterized in that the mass ratio of dodecyl trimethyl ammonium bromide to fatty alcohol is (5-6): (5-4).
8. The process for comprehensively recycling the chemical byproduct iron mud according to claim 1, wherein the TFe content in the iron mud is 60-61%; the obtained reverse flotation concentrate is high-purity magnetite concentrate with TFe content of 71.49-71.82%, and the reverse flotation tailings are common magnetite concentrate with TFe content of 61.57-64.25%.
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| CN107254583A (en) * | 2017-06-09 | 2017-10-17 | 张建华 | One kind is based on the red mud method of comprehensive utilization of rotary kiln for directly reducing roasting-magnetic separation |
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| AU649441B2 (en) * | 1990-08-30 | 1994-05-26 | Almeth Pty Ltd | Improved process for separating ilmenite |
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