CN112408831B - Steel slag-cyaniding tailing cementing material and preparation method and application thereof - Google Patents
Steel slag-cyaniding tailing cementing material and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
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- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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Abstract
The invention provides a steel slag-cyanidation tailing cementing material and a preparation method and application thereof. The steel slag-cyaniding tailing cementing material consists of the following substances in percentage by mass: 30-60% of iron-selecting waste residues, 10-20% of aerated concrete waste materials, 15-25% of carbide slag and 10-30% of desulfurized gypsum. Calcining the carbide slag, naturally cooling, and grinding; crushing, drying and grinding the aerated concrete waste; after being ground, the desulfurized gypsum is mixed with the iron-selecting waste slag of the steel slag-cyaniding tailings according to a proportion to prepare the steel slag-cyaniding tailings cementing material. The cementing material is mixed with portland cement to prepare the steel slag-cyanidation tailing cement. The preparation method is simple and feasible, can realize the synergistic utilization of various wastes, improves the added value of the wastes, reduces the production cost of cement, and has good social and economic effects.
Description
Technical Field
The invention belongs to the technical field of metal recycling, and particularly relates to a steel slag-cyanidation tailing cementing material, and a preparation method and application thereof.
Background
The cyaniding tailings are waste residues discharged after gold smelting in China, a large amount of cyaniding slag is discharged every year in the gold industry in China, and the discharge amount of the cyaniding slag is increased every year along with the continuous development of production. In particular, in recent years, with the continuous improvement of the production process, the cyanidation method has been widely adopted, and the corresponding discharge of a large amount of cyanidation tailings brings about some serious problems. The cyanidation tailings or full mud cyanidation slag of flotation gold concentrate has the common characteristic that the slag granularity is very fine, for example, the cyanidation slag granularity of Guangdong river Taiwan gold mine is less than 37um and accounts for 90 percent, the valley gold mine of Hebei gold factory accounts for more than 99 percent of 350 meshes, and the gold mine of Shandong Laiyu Sanshan island accounts for more than 80 percent. Cyanide residues are generally stockpiled as solid waste in the form of a tailings pond. The granularity of the cyanide slag is thinned in the ore dressing process, the surface area is increased, and the cyanide slag is easy to flow and collapse when being piled up in large quantities, so that vegetation damage and injury accidents are caused. As the amount of cyanide slag increases, the dam height also increases correspondingly. Valuable elements such as gold, silver, copper, lead, zinc, sulfur and iron are comprehensively recovered from cyanide slag, but the iron phase wraps the metallographic phase, so that the recovery rate of direct gold cyanide is very low. How to effectively recycle the iron in the cyanidation tailings and effectively utilize the cyanidation tailings after iron selection is a technical problem to be solved urgently.
The steel slag is one of main solid wastes generated in the steel production process, the discharge amount of the steel slag is about 12-20% of the yield of crude steel due to a large amount of discharged melts after lime is used for extracting impurities in steel making, and in recent years, the steel slag discharged in China is about 7-8 million tons, but the utilization rate of the steel slag is less than 40%. According to different steelmaking processes, the generated steel slag comprises converter steel slag, refining slag, casting residue, electric furnace steel slag, pretreatment slag and the like, and more than 95% of steel slag in China is steel slag for converter steelmaking, so most of steel slag research is steel slag for converter steelmaking. The steel slag generally contains 10 to 30 percent of metallic iron, the recycling of the steel slag not only can improve the utilization rate of ferrous metallurgy raw materials, but also is a prerequisite condition for the comprehensive utilization of the steel slag, and can bring huge economic benefits and environmental benefits for steel enterprises.
How to effectively utilize the steel slag and the cyanidation tailings, change waste into valuable, greatly reduce environmental pollution and realize great economic benefit and social benefit, and the technical problem is urgently solved by people.
Disclosure of Invention
The invention provides a steel slag-cyanidation tailing cementing material, and a preparation method and application thereof, which can effectively consume steel slag and cyanidation slag, realize the purposes of energy conservation and environmental protection, and can change waste into valuable, so that solid waste has higher economic value.
The invention relates to a steel slag-cyanidation tailing cementing material which is prepared from the following substances in percentage by mass:
further, the iron selection waste residue is the waste residue left after iron selection of steel slag and cyanidation tailings.
Further, the steel slag comprises the following main chemical components: SiO 2220-40% of CaO, 20-40% of Al2O35-10%, MgO 2-4%, Fe2O320 to 30 percent.
Further, the main chemical components of the cyanidation tailings are as follows: SiO 2230 to 50% of TFe and 30 to 50% of TFe.
Further, the preparation method of the iron-selecting waste slag comprises the following steps:
s1, carbonizing the undisturbed steel slag through a concrete carbonization box, crushing the carbonized steel slag through a jaw crusher, and grinding the crushed steel slag through a ball mill to form steel slag powder;
s2, mixing the steel slag powder with cyanidation tailings in a ratio of 1:1, and separating the mixture into the following components by a dry strong magnetic roller: iron powder 1 and mixture 1;
s3, grinding the mixture 1 to 100-200 m2/kg，The method comprises the following steps of: 100 to 160m21/kg of coarse slag and 160-200 m2Fine slag 1/kg;
s4, continuously separating the coarse slag 1 into the following components by a dry weak magnetic roller: coarse slag 2 and iron powder 2;
s5, mixing the fine slag and the coarse slag 2, and grinding the mixture to 400-800 m by using a vibrating ceramic mill2Kg, forming a mix 2;
s6, continuously separating the mixture 2 into the following components by a dry weak magnetic roller: fine slag 2 and iron powder 3; the iron powder 1, the iron powder 2 and the iron powder 3 are all mineral processing iron powder; the fine slag 2 is the iron-selecting waste slag.
Further, the carbonization time in the step S1 is 24-72h, and the ball mill grinds to be less than 2 mm.
Further, the magnetic field intensity of the dry type strong magnetic roller in the step S2 is 1.5-2T, and the rotating speed of the magnetic separator is 10-20 r/min.
Furthermore, the magnetic field intensity of the dry type weak magnetic roller in the steps S4 and S6 is 50mT to 80mT, and the rotating speed of the magnetic separator is 10 r/min to 20 r/min.
The invention also comprises a preparation method of the steel slag-cyanidation tailing cementing material, which comprises the following steps:
sa, calcining the carbide slag at 600-800 ℃, naturally cooling, and grinding to obtain powder with the specific surface area of 300-500 m2Per kg; the waste material of the aerated concrete is crushed to<2mm, drying and grinding to the specific surface area of 300-500 m2Per kg; grinding the desulfurized gypsum powder to the surface area of 400-600 m2/kg；
Sb, mixing the carbide slag treated in the step S1, the aerated concrete waste, the desulfurized gypsum and the iron-selecting waste slag of the steel slag-cyaniding tailings in proportion to prepare the steel slag-cyaniding tailings cementing material.
The invention further discloses the application of the steel slag-cyaniding tailing cementing material in cement, and the steel slag-cyaniding tailing cementing material and portland cement are mixed to prepare the steel slag-cyaniding tailing cement, wherein the mass ratio of the steel slag-cyaniding tailing cementing material to the portland cement is 9: 1-7: 3.
Compared with the prior art, the invention can obtain the following technical effects:
1) according to the method for magnetically separating the iron powder from the steel slag and the cyaniding tailings, the steel slag and the cyaniding slag are used as main raw materials, the preparation method is simple and easy to implement, the large-scale utilization of the steel slag and the cyaniding slag can be realized, and the additional values of various solid wastes are improved;
2) the raw materials required by the invention are wide in source and low in price, and the comprehensive utilization rate of the solid waste basically reaches more than 90%;
3)3) the waste residue after extraction can also be used as admixture of cement admixture, thereby reducing the production cost of cement, realizing reutilization of solid waste and realizing green sustainable development of the solid waste.
4) The cementing material of the invention has a curing effect on cyanide ions contained in cyanide slag, carbide slag is added into the system to adjust the pH to be alkaline, and Fe is used for simultaneously adjusting the pH to be alkaline3+、Fe2+The catalyst converts cyanide ions into precipitates which are absorbed by tiny gaps in the aerated concrete waste, thereby achieving the effect of absorbing cyanide ions. Meanwhile, after the cementing material is hydrated, C-S-H gel and AFt are mainly generated, and the C-S-H gel reacts with CN & lt- & gt in the system as follows: C-S-H + CN- → C-S-H-CN-. In addition, because CN < - > is added, the degree of crystallization of AFt is deteriorated, Ca < -CN > ettringite is formed in the system, and CN < - > is completely solidified in the hydration product and mutually overlapped and mutually wrapped, thereby finally achieving the purpose of solidifying cyanide ions.
Drawings
FIG. 1 is a process flow chart of the preparation method of the steel slag-cyanidation tailing cementing material.
Detailed Description
The following embodiments are described in detail with reference to the accompanying drawings, so that how to implement the technical features of the present invention to solve the technical problems and achieve the technical effects can be fully understood and implemented.
The invention discloses a steel slag-cyaniding tailing cementing material which is prepared from the following substances in percentage by mass:
the iron selection waste slag is the waste slag left after iron selection of steel slag and cyanidation tailings; further, the steel slag comprises the following main chemical components: SiO 2220-40% of CaO, 20-40% of Al2O35-10%, MgO 2-4%, Fe2O320-30%; the main chemical components of the cyanidation tailings are as follows: SiO 2230 to 50% of TFe and 30 to 50% of TFe.
The preparation method of the iron-selecting waste residue comprises the following steps:
step 1, carbonizing undisturbed steel slag in a concrete carbonization box for 24-72 hours, crushing the steel slag by a jaw crusher, and grinding the crushed steel slag to be less than 2mm by a ball mill to form steel slag powder;
step 2, mixing the steel slag powder with cyaniding tailings in a ratio of 1:1, and separating the mixture into the following components by a dry strong magnetic roller: iron powder 1 and mixture 1; wherein the magnetic field intensity is 1.5-2T, and the rotating speed of the magnetic separator is 10-20 r/min;
step 3, grinding the mixture 1 to 100-200 m2Kg, classified by winnowing into: 100 to 160m21/kg of coarse slag and 160-200 m2Fine slag/kg;
and 4, continuously separating the coarse slag 1 into the following components by a dry weak magnetic roller: coarse slag 2 and iron powder 2; wherein the magnetic field intensity is 50-80 mT, and the rotating speed of the magnetic separator is 10-20 r/min;
step 5, mixing the fine slag and the coarse slag 2, and grinding the mixture to 400-800 m by using a vibrating ceramic mill2Kg, forming a mix 2;
the step S6 is: the mixture 2 is continuously separated into the following components by a dry weak magnetic roller: fine slag 2 and iron powder 3; the iron powder 1, the iron powder 2 and the iron powder 3 are all mineral processing iron powder, and the fine slag 2 is iron selection waste slag.
The beneficiation iron powder comprises the following chemical components: TFe 66-72%, S0.02-0.03%, P0.01-0.015%, SiO25 to 8 percent of As, 0.03 to 0.04 percent of Sn, 0.03 to 0.05 percent of Zn and 0.05 to 0.08 percent of Pb.
The iron particles in the steel slag have high hardness and good ductility, so the steel slag with high iron particle content has poor grindability, and the fine grinding of the steel slag is beneficial to exposing the iron particles in the steel slag. The iron particles which are exposed are separated by the magnet, so that the recovery rate is improved. The cyanidation tailings have a fine particle size, but iron phase wraps the metallographic phase, so that iron particles are exposed in a grinding mode in order to obtain high recovery rate.
The invention also discloses a preparation method of the steel slag-cyanidation tailing cementing material, which comprises the following steps: calcining the carbide slag at 600-800 ℃, naturally cooling, and grinding to obtain powder with the specific surface area of 300-500 m2Per kg; the waste material of the aerated concrete is crushed to<2mm, drying and grinding to the specific surface area of 300-500 m2Per kg; grinding the desulfurized gypsum powder to the specific surface area of 400-600 m2Per kg; and mixing the materials with iron-selecting waste slag of the steel slag-cyanidation tailings according to a proportion to prepare the steel slag-cyanidation tailings cementing material.
The invention also discloses an application of the steel slag-cyaniding tailing cementing material in cement, and the steel slag-cyaniding tailing cementing material and silicate cement are mixed to prepare the steel slag-cyaniding tailing cement, wherein the mass ratio of the steel slag-cyaniding tailing cementing material to the silicate cement is 9: 1-7: 3.
Example 1
The steel slag-cyaniding tailing cementing material consists of the following substances in percentage by mass:
the preparation method of the iron-selecting waste residue comprises the following steps: the original-state steel slag is carbonized for 48 hours by a concrete carbonization box, crushed by a jaw crusher and ground to less than 2mm by a ball mill to form steel slag powder; mixing steel slag powder and cyaniding tailings in a ratio of 1:1, and separating the mixture into the following components by a dry strong magnetic roller with a magnetic field intensity of 1.5T and a magnetic separator rotating speed of 10-20 r/min: iron powder 1 and mixture 1; grinding the mixture 1 to 100-200 m2Kg, classified by winnowing into: 100 to 160m21/kg of coarse slag and 160-200 m2Fine slag/kg; the coarse slag 1 is continuously passed through a magnetic separator with the magnetic field intensity of 50mTThe dry weak magnetic roller with the rotating speed of 15r/min is separated into: coarse slag 2 and iron powder 2; mixing the fine slag and the coarse slag 2, and grinding the mixture to 400-800 m by a vibrating ceramic mill2Kg, forming a mix 2; the mixture 2 is continuously separated into the following components by a dry weak magnetic roller: fine slag 2 and iron powder 3; the iron powder 1, the iron powder 2 and the iron powder 3 are all mineral processing iron powder, and the fine slag 2 is iron selection waste slag.
Through the treatment of the steps, the detection shows that the iron metallization rate of the collected iron powder is 32.57%, the iron grade is 58.13%, and the iron recovery rate is 62.72%.
In this embodiment, the chemical components of the beneficiated iron powder are: TFe 66-72%, S0.02-0.03%, P0.01-0.015%, SiO25 to 8 percent of As, 0.03 to 0.04 percent of Sn, 0.03 to 0.05 percent of Zn and 0.05 to 0.08 percent of Pb.
In this embodiment, the steel slag comprises the following main chemical components: SiO 2220-40% of CaO, 20-40% of Al2O35-10%, MgO 2-4%, Fe2O320 to 30 percent.
In this example, the main chemical components of the cyanidation tailings are: SiO 2230 to 50% of TFe and 30 to 50% of TFe.
The preparation method of the steel slag-cyanidation tailing cementing material in the embodiment 1 comprises the following steps: calcining carbide slag at 600 deg.C, naturally cooling, and grinding to specific surface area of 300m2Per kg; the waste material of the aerated concrete is crushed to<2mm, drying and grinding to a specific surface area of 300m2Per kg; grinding the desulfurized gypsum powder to the specific surface area of 400m2Per kg; and mixing the materials with the steel slag-cyanidation tailing iron selection waste slag according to a proportion to prepare the steel slag-cyanidation tailing cementing material. The steel slag-cyaniding tailing cementing material comprises the following components in percentage by mass: 30% of iron selecting waste residues, 20% of aerated concrete waste materials, 20% of carbide slag and 30% of desulfurized gypsum.
Mixing the steel slag-cyaniding tailing cementing material with portland cement to prepare the steel slag-cyaniding tailing cement, wherein the mass ratio of the steel slag-cyaniding tailing cementing material to the portland cement is 9: 1. The cement has a strength grade of 42.5, initial setting time of 46min, final setting time of 398min, and specific surface area of 324m2/kg。
The cyanide content was measured according to HJ484-2009, volumetric and spectrophotometric determination of cyanide Water quality. Soaking cyanide residues in water (25 ℃) for 24 hours, and measuring the content of cyanide as an initial value; the steel slag-cyanide slag cement was hardened by mixing with water, then cured for 24 hours under standard curing conditions, then the cured cement blocks were crushed, immersed in water (25 ℃) for 24 hours, the cyanide elution value was measured, and the cyanide curing rate was calculated, and the steel slag-cyanide slag cement cyanide curing rate obtained according to example 1 is shown in table 1.
TABLE 1 solidification rate of steel slag-cyanide slag cement cyanide prepared in example 1
| Initial value/mg. ml-1 | Dissolution value/mg/ml-1 | Percent curing/%) |
| 1.16 | 0.40 | 65.5 |
Example 2
The steel slag-cyaniding tailing cementing material consists of the following substances in percentage by mass:
the preparation method of the iron-selecting waste residue comprises the following steps:
the original-state steel slag is carbonized for 24 hours by a concrete carbonization box, crushed by a jaw crusher and ground to less than 2mm by a ball mill to form steel slag powder; mixing steel slag powder and cyaniding tailings in a ratio of 1:1, and separating the mixture into the following components by a dry strong magnetic roller with a magnetic field intensity of 1.8T and a magnetic separator rotating speed of 10-20 r/min: iron powder 1 and mixture 1; grinding the mixture 1 to 100-200 m2Kg, classified by winnowing into: 100 to 160m21/kg of coarse slag and 160-200 m2Fine slag/kg; the coarse slag 1 is continuously separated into the following components by a dry weak magnetic roller with the magnetic field intensity of 70mT and the rotating speed of a magnetic separator of 20 r/min: coarse slag 2 and iron powder 2; mixing the fine slag and the coarse slag 2, and grinding the mixture to 400-800 m by a vibrating ceramic mill2Kg, forming a mix 2; the mixture 2 is continuously separated into the following components by a dry weak magnetic roller: fine slag 2 and iron powder 3; the iron powder 1, the iron powder 2 and the iron powder 3 are all mineral processing iron powder.
Through the treatment of the steps, the detection shows that the iron metallization rate of the collected iron powder is 35.28%, the iron grade is 60.58%, and the iron recovery rate is 67.51%.
In this embodiment, the chemical components of the beneficiated iron powder are: TFe 66-72%, S0.02-0.03%, P0.01-0.015%, SiO25 to 8 percent of As, 0.03 to 0.04 percent of Sn, 0.03 to 0.05 percent of Zn and 0.05 to 0.08 percent of Pb.
In this embodiment, the steel slag comprises the following main chemical components: SiO 2220-40% of CaO, 20-40% of Al2O35-10%, MgO 2-4%, Fe2O320 to 30 percent.
In this example, the main chemical components of the cyanidation tailings are: SiO 2230 to 50% of TFe and 30 to 50% of TFe.
The preparation method of the steel slag-cyanidation tailing cementing material of the embodiment 2 comprises the following steps: calcining carbide slag at 600 deg.C, naturally cooling, and grinding to specific surface area of 300m2Per kg; the waste material of the aerated concrete is crushed to<2mm, drying and grinding to 400m of specific surface area2Per kg; grinding the desulfurized gypsum powder to the specific surface area of 400m2Per kg; and mixing the materials with the steel slag-cyanidation tailing iron selection waste slag according to a proportion to prepare the steel slag-cyanidation tailing cementing material. The steel slag-cyaniding tailing cementing material comprises the following components in percentage by mass: 40% of iron selecting waste residues, 15% of aerated concrete waste materials, 25% of carbide slag and 20% of desulfurized gypsum.
And mixing the steel slag-cyaniding tailing cementing material with portland cement to prepare the steel slag-cyaniding tailing cement, wherein the mass ratio of the steel slag-cyaniding tailing cementing material to the portland cement is 7: 3.
The cement has a strength grade of 42.5, initial setting time of 46min, final setting time of 397min, and specific surface area of 322m2/kg。
The cyanide content was measured according to HJ484-2009, volumetric and spectrophotometric determination of cyanide Water quality. Soaking cyanide residues in water (25 ℃) for 24 hours, and measuring the content of cyanide as an initial value; the steel slag-cyanide slag cement was hardened by mixing with water, then cured for 24 hours under standard curing conditions, then the cured cement blocks were crushed, immersed in water (25 ℃) for 24 hours, the cyanide elution value was measured, and the cyanide curing rate was calculated, and the steel slag-cyanide slag cement cyanide curing rate obtained according to example 2 is shown in table 2.
TABLE 2 solidification rate of steel slag-cyanide slag cement cyanide prepared in example 2
| Initial value/mg. ml-1 | Dissolution value/mg/ml-1 | Percent curing/%) |
| 1.03 | 0.33 | 67.9 |
Example 3
The steel slag-cyaniding tailing cementing material consists of the following substances in percentage by mass:
the preparation method of the iron-selecting waste residue comprises the following steps:
the original-state steel slag is carbonized for 72 hours by a concrete carbonization box, crushed by a jaw crusher and ground to less than 2mm by a ball mill to form steel slag powder; mixing steel slag powder and cyaniding tailings in a ratio of 1:1, and separating the mixture into the following components by a dry strong magnetic roller with the magnetic field intensity of 2.0T and the rotating speed of a magnetic separator of 10-20 r/min: iron powder 1 and mixture 1; grinding the mixture 1 to 100-200 m2Kg, classified by winnowing into: 100 to 160m21/kg of coarse slag and 160-200 m2Fine slag/kg; the coarse slag 1 is continuously separated into the following components by a dry weak magnetic roller with the magnetic field intensity of 80mT and the rotating speed of a magnetic separator of 20 r/min: coarse slag 2 and iron powder 2; mixing the fine slag and the coarse slag 2, and grinding the mixture to 400-800 m by a vibrating ceramic mill2Kg, forming a mix 2; the mixture 2 is continuously separated into the following components by a dry weak magnetic roller: fine slag 2 and iron powder 3; the iron powder 1, the iron powder 2 and the iron powder 3 are all mineral processing iron powder.
Through the treatment of the steps, the detection shows that the iron metallization rate of the collected iron powder is 36.75%, the iron grade is 61.52%, and the iron recovery rate is 68.63%.
In this embodiment, the steel slag comprises the following main chemical components: SiO 2220-40% of CaO, 20-40% of Al2O35-10%, MgO 2-4%, Fe2O320-30%, MnO 0.01-3%, loss on ignition 1-8%, and others 0.01-2%. In this example, the main chemical components of the cyanidation tailings are: SiO 2230 to 50% of TFe and 30 to 50% of TFe. In this embodiment, the chemical components of the beneficiated iron powder are: TFe 66-72%, S0.02-0.03%, P0.01-0.015%, SiO25-8% of As0.03-0.04%, Sn 0.03-0.05%, Zn 0.05-0.08%, and Pb 0.05-0.08%.
The preparation method of the steel slag-cyanidation tailing cementing material comprises the following steps: calcining carbide slag at 600 deg.C, naturally cooling, and grinding to specific surface area of 300m2Per kg; the waste material of the aerated concrete is crushed to<2mm, drying and grinding to a specific surface area of 500m2Per kg; grinding the desulfurized gypsum powder to the specific surface area of 400m2Per kg; and mixing the materials with the steel slag-cyanidation tailing iron selection waste slag according to a proportion to prepare the steel slag-cyanidation tailing cementing material. The steel slag-cyaniding tailing cementing material comprises the following components in percentage by mass: 50% of iron selecting waste residues, 20% of aerated concrete waste materials, 15% of carbide slag and 15% of desulfurized gypsum. Preparing steel slag-cyaniding tailing iron-selecting waste slag into a steel slag-cyaniding tailing cementing material, and mixing the steel slag-cyaniding tailing cementing material with portland cement to prepare the steel slag-cyaniding tailing cement, wherein the mass ratio of the steel slag-cyaniding tailing cementing material to the portland cement is 8: 2.
the cement has a strength grade of 42.5, initial setting time of 47min, final setting time of 399min, and specific surface area of 315m2/kg。
The cyanide content was measured according to HJ484-2009, volumetric and spectrophotometric determination of cyanide Water quality. Soaking cyanide residues in water (25 ℃) for 24 hours, and measuring the content of cyanide as an initial value; the steel slag-cyanide slag cement was hardened by mixing with water, then cured for 24 hours under standard curing conditions, then the cured cement blocks were crushed, immersed in water (25 ℃) for 24 hours, the cyanide elution value was measured, and the cyanide curing rate was calculated, and the steel slag-cyanide slag cement cyanide curing rate obtained according to example 3 is shown in table 3.
TABLE 3 solidification rate of steel slag-cyanide slag cement cyanide prepared in example 3
| Initial value/mg. ml-1 | Dissolution value/mg/ml-1 | Percent curing/%) |
| 1.06 | 0.37 | 65.1 |
Example 4
The steel slag-cyaniding tailing cementing material consists of the following substances in percentage by mass:
the preparation method of the iron-selecting waste residue comprises the following steps:
the original-state steel slag is carbonized for 72 hours by a concrete carbonization box, crushed by a jaw crusher and ground to less than 2mm by a ball mill to form steel slag powder; mixing steel slag powder and cyaniding tailings in a ratio of 1:1, and separating the mixture into the following components by a dry strong magnetic roller with the magnetic field intensity of 2.0T and the rotating speed of a magnetic separator of 10-20 r/min: iron powder 1 and mixture 1; grinding the mixture 1 to 100-200 m2Kg, classified by winnowing into: 100 to 160m21/kg of coarse slag and 160-200 m2Fine slag/kg; the coarse slag 1 is continuously separated into the following components by a dry weak magnetic roller with the magnetic field intensity of 80mT and the rotating speed of a magnetic separator of 20 r/min: coarse slag 2 and iron powder 2; mixing the fine slag and the coarse slag 2, and grinding the mixture to 400-800 m by a vibrating ceramic mill2Kg, forming a mix 2; the mixture 2 is continuously separated into the following components by a dry weak magnetic roller: fine slag 2 and iron powder 3; the iron powder 1, the iron powder 2 and the iron powder 3 are all mineral processing iron powder.
Through the treatment of the steps, the detection shows that the iron metallization rate of the collected iron powder is 37.20%, the iron grade is 60.76%, and the iron recovery rate is 68.12%.
In this embodiment, the steel slag comprises the following main chemical components: SiO 2220 to 40% of CaO, 20 to 4% of CaO0％，Al2O35-10%, MgO 2-4%, Fe2O320-30%, MnO 0.01-3%, loss on ignition 1-8%, and others 0.01-2%. In this example, the main chemical components of the cyanidation tailings are: SiO 2230 to 50% of TFe and 30 to 50% of TFe. In this embodiment, the chemical components of the beneficiated iron powder are: TFe 66-72%, S0.02-0.03%, P0.01-0.015%, SiO25 to 8 percent of As, 0.03 to 0.04 percent of Sn, 0.03 to 0.05 percent of Zn and 0.05 to 0.08 percent of Pb.
The preparation method of the steel slag-cyanidation tailing cementing material comprises the following steps: calcining carbide slag at 600 deg.C, naturally cooling, and grinding to specific surface area of 300m2Per kg; the waste material of the aerated concrete is crushed to<2mm, drying and grinding to a specific surface area of 500m2Per kg; grinding the desulfurized gypsum powder to the specific surface area of 400m2Per kg; and mixing the materials with the steel slag-cyanidation tailing iron selection waste slag according to a proportion to prepare the steel slag-cyanidation tailing cementing material. The steel slag-cyaniding tailing cementing material comprises the following components in percentage by mass: 60% of iron selecting waste residues, 10% of aerated concrete waste materials, 20% of carbide slag and 10% of desulfurized gypsum. Preparing steel slag-cyaniding tailing iron-selecting waste slag into a steel slag-cyaniding tailing cementing material, and mixing the steel slag-cyaniding tailing cementing material with portland cement to prepare the steel slag-cyaniding tailing cement, wherein the mass ratio of the steel slag-cyaniding tailing cementing material to the portland cement is 7: 3.
the cement has a strength grade of 42.5, initial setting time of 46min, final setting time of 385min, and specific surface area of 320m2/kg。
The cyanide content was measured according to HJ484-2009, volumetric and spectrophotometric determination of cyanide Water quality. Soaking cyanide residues in water (25 ℃) for 24 hours, and measuring the content of cyanide as an initial value; the steel slag-cyanide slag cement was hardened by mixing with water, then cured for 24 hours under standard curing conditions, then the cured cement blocks were crushed, immersed in water (25 ℃) for 24 hours, the cyanide elution value was measured, and the cyanide curing rate was calculated, and the steel slag-cyanide slag cement cyanide curing rate obtained according to example 4 is shown in table 4.
TABLE 4 solidification rate of cyanide in steel slag-cyanide slag cement obtained in example 4
| Initial value/mg. ml-1 | Dissolution value/mg/ml-1 | Percent curing/%) |
| 1.05 | 0.36 | 65.3 |
From examples 1 to 4, it can be seen that: the iron powder magnetically separated from the steel slag and the cyanidation tailings is utilized, the iron metallization rate is greater than 32%, the iron grade is greater than 58%, and the iron recovery rate is greater than 62%. The strength grade of the cement prepared by selecting iron waste residues from the steel slag and the cyanidation tailings is 42.5. The curing rate of the cyanide is 60-70%.
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, etc. made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The steel slag-cyaniding tailing cementing material is characterized by comprising the following substances in percentage by mass:
30 to 60 percent of iron selection waste residue
10-20% of aerated concrete waste
15 to 25 percent of carbide slag
10-30% of desulfurized gypsum;
the iron selection waste residue is prepared by the following steps:
s1, carbonizing the undisturbed steel slag through a concrete carbonization box, crushing the carbonized steel slag through a jaw crusher, and grinding the crushed steel slag through a ball mill to form steel slag powder;
s2, mixing the steel slag powder with cyanidation tailings in a ratio of 1:1, and separating the mixture into the following components by a dry strong magnetic roller: iron powder 1 and mixture 1;
s3, grinding the mixture 1 to 100-200 m2Kg, classified by winnowing into: 100 to 160m21/kg of coarse slag and 160-200 m2Fine slag 1/kg;
s4, continuously separating the coarse slag 1 into the following components by a dry weak magnetic roller: coarse slag 2 and iron powder 2;
s5, mixing the fine slag 1 and the coarse slag 2, and grinding the mixture to 400-800 m by using a vibrating ceramic mill2Kg, forming a mix 2;
s6, continuously separating the mixture 2 into the following components by a dry weak magnetic roller: fine slag 2 and iron powder 3; the iron powder 1, the iron powder 2 and the iron powder 3 are all mineral processing iron powder; the fine slag 2 is the iron-selecting waste slag.
2. The steel slag-cyanidation tailing cementing material of claim 1, which is characterized by comprising the following main chemical components: SiO 2220-40% of CaO, 20-40% of Al2O35-10%, MgO 2-4%, Fe2O320 to 30 percent.
3. The steel slag-cyanidation tailing cementing material of claim 1, which is characterized by comprising the following main chemical components in percentage by weight: SiO 2230 to 50% of TFe and 30 to 50% of TFe.
4. The steel slag-cyanidation tailing cementitious material of claim 1, wherein the carbonization time in the step S1 is 24-72 hours, and the ball mill is used for grinding the steel slag-cyanidation tailing cementitious material to less than 2 mm.
5. The steel slag-cyanidation tailing cementing material of claim 1, wherein the magnetic field strength of the dry strong magnetic roller in the step S2 is 1.5-2T, and the rotating speed of the magnetic separator is 10-20 r/min.
6. The steel slag-cyanidation tailing cementing material of claim 1, wherein the magnetic field strength of the dry type weak magnetic roller in the steps S4 and S6 is 50mT to 80mT, and the rotating speed of the magnetic separator is 10 r/min to 20 r/min.
7. The method of preparing a steel slag-cyanidation tailing cementitious material according to any one of claims 1 to 6, the preparation method comprising the steps of:
sa, calcining the carbide slag at 600-800 ℃, naturally cooling, and grinding to obtain powder with the specific surface area of 300-500 m2Per kg; the waste material of the aerated concrete is crushed to<2mm, drying and grinding to the specific surface area of 300-500 m2Per kg; grinding the desulfurized gypsum powder to the surface area of 400-600 m2/kg；
Sb, mixing the carbide slag, the aerated concrete waste material and the desulfurized gypsum which are treated in the step Sa with the iron-selecting waste slag of the steel slag-cyaniding tailings in proportion to prepare the steel slag-cyaniding tailings cementing material.
8. The application of the steel slag-cyaniding tailing cementing material in cement according to any one of claims 1 to 6, which is prepared by mixing the steel slag-cyaniding tailing cementing material with portland cement, wherein the mass ratio of the steel slag-cyaniding tailing cementing material to the portland cement is 9: 1-7: 3.
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