A method for preparing slag micro-powder by using titanium extraction tailings

Abstract

The application discloses a method for preparing slag micro-powder by using titanium extraction tailings, and relates to the technical field of mine exploitation and treatment. The method for preparing slag micro-powder by using titanium extraction tailings comprises the following steps: step S10, carrying out dechlorination on the titanium extraction tailings to obtain dechlorinated titanium extraction tailings; step S20, carrying out drying treatment on the dechlorinated titanium extraction tailings to obtain dried titanium extraction tailings; and step S30, adding a chlorine fixation agent into the dried titanium extraction tailings in a proportion to carry out mixing and grinding treatment, so as to obtain slag micro-powder; wherein the specific surface area of the slag micro-powder is greater than or equal to 400 m 2 / kg. The raw material process is simple, and the solid waste resource characteristics are fully utilized. The solid chlorine fixation technology is effectively used, the chlorine in the titanium extraction tailings does not need to be removed to below 0.06%, and the cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine exploitation and processing, and particularly relates to a method for preparing slag micro-powder from titanium extraction tailings. BACKGROUND

[0002] Due to the adoption of the chlorination titanium extraction process, the original slag of the titanium extraction tailings contains a high amount of chlorine, mainly in the form of calcium chloride and magnesium chloride. Due to the high amount of chlorine in the titanium extraction tailings, the titanium extraction tailings cannot be prepared into slag micro-powder like ordinary granulated blast furnace slag and applied to the cement and concrete industries.

[0003] The cement and concrete industries have strict requirements on the content of chloride ions (Cl < 0.06%), and a high content of chloride ions can cause serious corrosion of steel bars, metal structures and the like, resulting in a shortened service life of buildings. The original slag of the titanium extraction tailings contains a high amount of chlorine, mainly in the form of calcium chloride, magnesium chloride and other chloride salts. Calcium chloride, magnesium chloride and other chloride salts have a significant promoting effect on the early strength of cement hydration products, and concrete first commonly uses calcium chloride, magnesium chloride and other chloride-containing early strength agents to improve the early strength. However, considering the corrosion of chloride ions on steel bars and other metal components, chloride-containing early strength agents are gradually replaced by chloride-free early strength agents (such as calcium formate and sodium aluminate). Therefore, the chloride salts in the titanium extraction tailings are a double-edged sword. In order to meet the standard requirements of slag micro-powder, the titanium extraction tailings must be deeply dechlorinated, which has the problems of great technical difficulty and high production cost. In order to solve the technical problem, a method for preparing slag micro-powder from titanium extraction tailings is proposed. SUMMARY

[0004] The present application aims to provide a method for preparing slag micro-powder from titanium extraction tailings to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A method for preparing slag micro-powder from titanium extraction tailings, the method for preparing slag micro-powder from titanium extraction tailings comprising the following steps:

[0007] Step S10, dechlorination of the titanium extraction tailings to obtain dechlorinated titanium extraction tailings;

[0008] Step S20, drying treatment of the dechlorinated titanium extraction tailings to obtain dried titanium extraction tailings;

[0009] Step S30, adding a chlorine fixation agent to the dried titanium extraction tailings in a certain proportion for mixing and grinding treatment to obtain slag micro-powder; wherein the specific surface area of the slag micro-powder is greater than or equal to 400 m 2 / kg.

[0010] As a further scheme of the present application, the dechlorination treatment adopts water washing and rough dechlorination treatment.

[0011] As a further scheme of the present application: the mass content of chlorine in the titanium extraction tailings after dechlorination is 0.2% or less.

[0012] As a further scheme of the present application: the liquid-solid ratio of water washing and dechlorination is 6-4:1.

[0013] As a further scheme of the present application: the chlorine fixing agent includes high-aluminum raw material, vanadium-iron slag, lime, gypsum slag, and green vitriol.

[0014] As a further scheme of the present application: the mass content of each component in the slag powder is: high-aluminum raw material 5-30%, lime 2-8%, gypsum 1-5%, green vitriol 0.5-2%, and the rest is dry titanium extraction tailings.

[0015] As a further scheme of the present application: the high-aluminum raw material includes vanadium-iron slag by aluminothermic process or high-aluminum cement, with an alumina content of more than 50%.

[0016] As a further scheme of the present application: the lime uses metallurgical quicklime, with a calcium oxide content of more than 80%.

[0017] As a further scheme of the present application: the gypsum slag uses titanium gypsum or desulfurization gypsum, with a calcium sulfate dihydrate content of more than 60%.

[0018] As a further scheme of the present application: the green vitriol uses a byproduct of titanium dioxide by sulfuric acid method, which is ferrous sulfate heptahydrate.

[0019] Compared with the prior art, the present application has the beneficial effects that: the titanium extraction tailings are treated by water washing and rough dechlorination, the content of chloride ions is reduced to 0.2% or less, and after drying, high-aluminum raw material, lime, gypsum slag, green vitriol, etc. are added for mixing and grinding, the specific surface area is controlled at 400m 2 / kg, forming a high-activity slag powder. Although the slag powder has a high chlorine content, the chlorine fixing effect is significant, and it will not cause rust on the steel bars. At the same time, it has high activity and early strength, and can be applied in the field of construction engineering. The raw material process of the present application is simple, and fully utilizes the characteristics of solid waste resources. The solid chlorine removal technology is effectively used, and the chlorine in the titanium extraction tailings does not need to be removed to 0.06% or less, which is low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Structure diagram of one subject of the embodiment of the present application. DETAILED DESCRIPTION

[0021] The technical scheme of the present application will be further described in detail below in combination with specific embodiments.

[0022] The concrete buildings in the coastal areas of the Nordic countries are affected by sea winds all year round, and the chloride ions in seawater adhere to the surface of the buildings and continuously penetrate, eventually leading to corrosion of the steel bars in the buildings and shortening the service life of the buildings. In order to avoid the penetration of chloride ions into the concrete and improve the service life of the buildings, high-alumina fly ash or other high-alumina materials are added during the mixing of the concrete to form calcium aluminate mineral phases during the hardening process, and when the chloride ions penetrate, further reaction forms calcium chloroaluminate (F salt), which is a stable mineral, thereby realizing the solidification of chloride and preventing it from continuing to penetrate and damage the structures; therefore, the application provides a method for preparing slag micropowder from tailings after titanium extraction, which comprises the following steps:

[0023] Step S10, dechlorination of the tailings after titanium extraction to obtain tailings after titanium extraction after dechlorination;

[0024] The dechlorination treatment adopts water washing rough dechlorination treatment.

[0025] The mass content of chlorine in the tailings after titanium extraction after dechlorination is 0.2% or less.

[0026] In the embodiment of the application, the step S10, dechlorination of the tailings after titanium extraction to obtain tailings after titanium extraction after dechlorination, comprises:

[0027] The liquid-solid ratio of water washing dechlorination is 6-4:1.

[0028] Step S20, drying treatment of the tailings after titanium extraction after dechlorination to obtain dry tailings after titanium extraction;

[0029] Step S30, adding a chlorine fixation agent to the dry tailings after titanium extraction in a proportion for mixing and grinding treatment to obtain slag micropowder; wherein the specific surface area of the slag micropowder is greater than or equal to 400 m 2 / kg.

[0030] In the embodiment of the application, the chlorine fixation agent comprises high-alumina raw materials, vanadium-iron slag, lime, gypsum slag and green vitriol.

[0031] The mass content of each component in the slag micropowder is: the high-alumina raw material is mixed in an amount of 5-30%, the lime is mixed in an amount of 2-8%, the gypsum is mixed in an amount of 1-5%, the green vitriol is mixed in an amount of 0.5-2%, and the balance is the dry tailings after titanium extraction.

[0032] In the embodiment of the application, the high-alumina raw material comprises vanadium-iron slag by aluminothermic process or high-alumina cement, wherein the content of aluminum oxide is greater than 50%, and the main phases thereof are aluminum oxide, monocalcium aluminate, dicalcium aluminate and monocalcium hexaluminate.

[0033] In the embodiment of the application, the lime is metallurgical quicklime, and the content of calcium oxide is greater than 80%.

[0034] In the embodiment of the present application, the gypsum residue adopts titanium gypsum or desulfurization gypsum, and the content of calcium sulfate dihydrate is greater than 60%.

[0035] In the embodiment of the present application, the green vitriol adopts a by-product of sulfuric acid method titanium white, and is ferrous sulfate heptahydrate.

[0036] The titanium extraction tailings are treated by water washing and rough dechlorination, the content of chlorine ions is reduced to below 0.2%, and after drying, high-aluminum raw materials, lime, gypsum residue, green vitriol and the like are added for mixing and grinding, the specific surface area is controlled to 400 m 2 / kg, and high-activity slag powder is formed. 2 The slag powder has high chlorine content, but the chlorine fixation effect is remarkable, and does not cause rust of steel bars, and at the same time, has high activity and early strength effect, and can be applied in the field of construction engineering. The raw material process is simple, and the characteristics of solid waste resources are fully utilized. The solid chlorine fixation technology is effectively used, and the chlorine in the titanium extraction tailings does not need to be removed to below 0.06%, and the cost is low.

[0037] Embodiment 1

[0038] A method for preparing slag powder by using titanium extraction tailings, comprising the following steps:

[0039] Step S10, dechlorination is performed on the titanium extraction tailings to obtain titanium extraction tailings after dechlorination.

[0040] The dechlorination treatment adopts water washing and rough dechlorination treatment.

[0041] The mass content of chlorine in the titanium extraction tailings after dechlorination is below 0.2%.

[0042] In the embodiment of the present application, the step S10, dechlorination is performed on the titanium extraction tailings to obtain titanium extraction tailings after dechlorination, comprises:

[0043] The liquid-solid ratio of water washing and dechlorination is 6:1.

[0044] Step S20, drying treatment is performed on the titanium extraction tailings after dechlorination to obtain dry titanium extraction tailings.

[0045] Step S30, a chlorine fixation agent is added to the dry titanium extraction tailings in a proportion for mixing and grinding treatment to obtain slag powder; wherein the specific surface area of the slag powder is greater than or equal to 400 m 2 / kg.

[0046] In the embodiment of the present application, the chlorine fixation agent comprises high-aluminum raw materials, vanadium-iron slag, lime, gypsum residue and green vitriol.

[0047] The mass content of each component in the slag powder is as follows: the high-aluminum raw material is mixed by 30%, the lime is mixed by 8%, the gypsum is mixed by 5%, the green vitriol is mixed by 2%, and the rest is dry titanium extraction tailings.

[0048] In the embodiment of the present application, the high-aluminum raw material includes aluminothermic vanadium-iron slag or high-aluminum cement, wherein the content of aluminum oxide is greater than 50%, and the main phases thereof are aluminum oxide, monocalcium aluminate, dicalcium dialuminate, monocalcium hexaluminate, etc.

[0049] In the embodiment of the present application, the lime is raw lime for metallurgy, and the content of calcium oxide is greater than 80%.

[0050] In the embodiment of the present application, the gypsum slag is titanium gypsum or desulfurization gypsum, and the content of calcium sulfate dihydrate is greater than 60%.

[0051] In the embodiment of the present application, the green vitriol is a by-product of sulfuric acid method titanium dioxide, which is ferrous sulfate heptahydrate.

[0052] It should be noted that the tailing after titanium extraction is a by-product after high-temperature carbonization and low-temperature chlorination of titanium-containing blast furnace slag for titanium extraction, and the main components thereof are calcium oxide 26-30%, silicon dioxide 24-28%, titanium dioxide 5-10%, aluminum oxide 12-13%, magnesium oxide 8-9%, chloride ion 2-4%, and free carbon 3-5%. The tailing after titanium extraction is heat-treated at 600-700 DEG C to remove the free carbon therein.

[0053] Embodiment 2

[0054] A method for preparing slag micro-powder by using tailing after titanium extraction, comprising the following steps:

[0055] Step S10, dechlorination is performed on the tailing after titanium extraction to obtain tailing after titanium extraction after dechlorination;

[0056] The dechlorination treatment is water washing rough dechlorination treatment.

[0057] The mass content of chlorine in the tailing after titanium extraction after dechlorination is less than or equal to 0.2%.

[0058] In the embodiment of the present application, the step S10, dechlorination is performed on the tailing after titanium extraction to obtain tailing after titanium extraction after dechlorination, comprises:

[0059] The liquid-solid ratio of water washing dechlorination is 4:1.

[0060] Step S20, drying treatment is performed on the tailing after titanium extraction after dechlorination to obtain dried tailing after titanium extraction;

[0061] Step S30, a chlorine-fixing agent is added to the dried tailing after titanium extraction in a proportion for mixing and grinding treatment to obtain slag micro-powder; wherein the specific surface area of the slag micro-powder is greater than or equal to 400 m 2 / kg.

[0062] In the embodiment of the present application, the chlorine-fixing agent includes high-aluminum raw material, vanadium-iron slag, lime, gypsum slag, and green vitriol.

[0063] The mass content of each component in the slag powder is: 5% of the high-aluminum raw material, 2% of the lime, 1% of the gypsum, 0.5% of the green vitriol, and the rest is the dry titanium extraction tailing.

[0064] In the embodiment of the present application, the high-aluminum raw material includes aluminothermic vanadium iron slag or high-aluminum cement, wherein the content of aluminum oxide is greater than 50%, and the main phases thereof are aluminum oxide, calcium aluminate, dicalcium aluminate, calcium aluminate, etc.

[0065] In the embodiment of the present application, the lime is metallurgical quicklime, and the content of calcium oxide is greater than 80%.

[0066] In the embodiment of the present application, the gypsum slag is titanium gypsum or desulfurization gypsum, and the content of calcium sulfate dihydrate is greater than 60%.

[0067] In the embodiment of the present application, the green vitriol is a by-product of sulfuric acid titanium dioxide, which is ferrous sulfate heptahydrate.

[0068] Embodiment 3

[0069] A method for preparing a slag powder from a titanium extraction tailing, comprising the following steps:

[0070] Step S10, the titanium extraction tailing is subjected to dechlorination to obtain a dechlorinated titanium extraction tailing;

[0071] The dechlorination treatment is a water washing rough dechlorination treatment.

[0072] The mass content of chlorine in the dechlorinated titanium extraction tailing is less than or equal to 0.2%.

[0073] In the embodiment of the present application, the step S10, the titanium extraction tailing is subjected to dechlorination to obtain a dechlorinated titanium extraction tailing, comprises:

[0074] The liquid-solid ratio of the water washing dechlorination is 5.5:1.

[0075] Step S20, the dechlorinated titanium extraction tailing is subjected to drying treatment to obtain a dry titanium extraction tailing;

[0076] Step S30, a solid chlorine agent is added to the dry titanium extraction tailing in a certain proportion for mixing and grinding treatment to obtain a slag powder; wherein the specific surface area of the slag powder is greater than or equal to 400 m 2 / kg;

[0077] In the embodiment of the present application, the solid chlorine agent includes a high-aluminum raw material, a vanadium iron slag, lime, a gypsum slag, and a green vitriol.

[0078] The mass content of each component in the slag powder is: 5% of the high-aluminum raw material, 2% of the lime, 1% of the gypsum, 0.5% of the green vitriol, and the rest is the dry titanium extraction tailing.

[0079] In the embodiment of the present application, the high-aluminum raw material includes aluminothermic vanadium iron slag or high-aluminum cement, wherein the alumina content is greater than 50%, and the main phases thereof are alumina, monocalcium aluminate, dicalcium dialuminate, monocalcium hexaluminate, etc.

[0080] In the embodiment of the present application, the lime is metallurgical raw lime, and the calcium oxide content is greater than 80%.

[0081] In the embodiment of the present application, the gypsum slag is titanium gypsum or desulfurization gypsum, and the calcium sulfate dihydrate content is greater than 60%.

[0082] In the embodiment of the present application, the green vitriol is a by-product of sulfuric acid method titanium white, which is ferrous sulfate heptahydrate.

[0083] Embodiment 4

[0084] A method for preparing slag superfine powder by using a titanium extraction tailing, comprising the following steps:

[0085] Step S10, the titanium extraction tailing is subjected to dechlorination to obtain a dechlorinated titanium extraction tailing;

[0086] The dechlorination treatment is a water washing rough dechlorination treatment.

[0087] The mass content of chlorine in the dechlorinated titanium extraction tailing is less than or equal to 0.2%.

[0088] In the embodiment of the present application, the step S10, the titanium extraction tailing is subjected to dechlorination to obtain a dechlorinated titanium extraction tailing, comprises:

[0089] The liquid-solid ratio of the water washing dechlorination is 4.5:1.

[0090] Step S20, the dechlorinated titanium extraction tailing is subjected to drying treatment to obtain a dried titanium extraction tailing;

[0091] Step S30, a solid chlorine agent is added to the dried titanium extraction tailing in a proportion for mixing and grinding treatment to obtain a slag superfine powder; wherein the specific surface area of the slag superfine powder is greater than or equal to 400 m 2 / kg.

[0092] In the embodiment of the present application, the solid chlorine agent includes high-aluminum raw material, vanadium iron slag, lime, gypsum slag, and green vitriol.

[0093] The mass content of each component in the slag superfine powder is as follows: the high-aluminum raw material is mixed by 10%, the lime is mixed by 4%, the gypsum is mixed by 2%, the green vitriol is mixed by 1%, and the rest is the dried titanium extraction tailing.

[0094] In the embodiment of the present application, the high-aluminum raw material includes aluminothermic vanadium iron slag or high-aluminum cement, wherein the alumina content is greater than 50%, and the main phases thereof are alumina, monocalcium aluminate, dicalcium dialuminate, monocalcium hexaluminate, etc.

[0095] In the embodiment of the present application, the lime is metallurgical quicklime, and the calcium oxide content is greater than 80%.

[0096] In the embodiment of the present application, the gypsum residue is titanium gypsum or desulfurization gypsum, and the calcium sulfate dihydrate content is greater than 60%.

[0097] In the embodiment of the present application, the green vitriol is a by-product of the sulfuric acid method titanium white, and is ferrous sulfate heptahydrate.

[0098] Embodiment 5

[0099] A method for preparing slag micro-powder by using a titanium extraction tailing, comprising the following steps:

[0100] Step S10, the titanium extraction tailing is subjected to dechlorination to obtain a dechlorinated titanium extraction tailing;

[0101] The dechlorination treatment is a water washing rough dechlorination treatment.

[0102] The mass content of chlorine in the dechlorinated titanium extraction tailing is less than or equal to 0.2%.

[0103] In the embodiment of the present application, the step S10, the titanium extraction tailing is subjected to dechlorination to obtain a dechlorinated titanium extraction tailing, comprises:

[0104] The liquid-solid ratio of the water washing dechlorination is 5:1.

[0105] Step S20, the dechlorinated titanium extraction tailing is subjected to drying treatment to obtain a dried titanium extraction tailing;

[0106] Step S30, a solid chlorine agent is added to the dried titanium extraction tailing in a proportion for mixing and grinding treatment to obtain a slag micro-powder; wherein the specific surface area of the slag micro-powder is greater than or equal to 400 m 2 / kg.

[0107] In the embodiment of the present application, the solid chlorine agent comprises high-aluminum raw material, vanadium-iron slag, lime, gypsum residue, and green vitriol.

[0108] The mass content of each component in the slag micro-powder is as follows: the high-aluminum raw material is mixed by 15%, the lime is mixed by 5%, the gypsum is mixed by 3%, the green vitriol is mixed by 1.3%, and the remaining is the dried titanium extraction tailing.

[0109] In the embodiment of the present application, the high-aluminum raw material comprises vanadium-iron slag by aluminothermic method or high-aluminum cement, wherein the aluminum oxide content is greater than 50%, and the main phases are aluminum oxide, calcium aluminate, dicalcium aluminate, calcium aluminate, etc.

[0110] In the embodiment of the present application, the lime is metallurgical quicklime, and the calcium oxide content is greater than 80%.

[0111] In the embodiment of the present application, the gypsum residue adopts titanium gypsum or desulfurization gypsum, and the content of calcium sulfate dihydrate is greater than 60%.

[0112] In the embodiment of the present application, the green vitriol adopts ferrous sulfate heptahydrate which is a by-product of sulfuric acid method titanium white.

[0113] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A method for preparing slag powder using titanium extraction tailings, characterized in that, The method for preparing slag powder using titanium extraction tailings includes the following steps: Step S10: Dechlorinate the titanium extraction tailings to obtain dechlorinated titanium extraction tailings. Step S20: Dry the dechlorinated titanium extraction tailings to obtain dried titanium extraction tailings. Step S30: Add the solid chlorine agent to the dried titanium extraction tailings in a specified ratio and perform a mixing and grinding process to obtain slag powder; wherein the slag powder has a specific surface area greater than or equal to 400 m². 2 / kg; The chlorine-fixing agent includes high-alumina raw materials, lime, gypsum slag, and ferrous sulfate. The mass content of each component in the slag powder is as follows: 5-30% high-alumina raw materials, 2-8% lime, 1-5% gypsum, 0.5-2% ferrous sulfate, and the remainder is dried titanium extraction tailings. The high-alumina raw materials include aluminothermic vanadium ferroalloy slag or high-alumina cement, wherein the alumina content is greater than 50%.

2. The method for preparing slag powder using titanium extraction tailings according to claim 1, characterized in that, The dechlorination process used is coarse dechlorination via water washing.

3. The method for preparing slag powder using titanium extraction tailings according to claim 1, characterized in that, The chlorine content in the titanium extraction tailings after dechlorination is less than 0.2% by mass.

4. The method for preparing slag powder using titanium extraction tailings according to claim 2, characterized in that, The liquid-to-solid ratio for water washing and crude dechlorination is 6-4:

1.

5. The method for preparing slag powder using titanium extraction tailings according to claim 1, characterized in that, The lime used is metallurgical quicklime with a calcium oxide content greater than 80%.

6. The method for preparing slag powder using titanium extraction tailings according to claim 1, characterized in that, The gypsum residue is made of titanium gypsum or desulfurized gypsum, with a calcium sulfate dihydrate content greater than 60%.

7. The method for preparing slag powder using titanium extraction tailings according to claim 1, characterized in that, The green vitriol is a byproduct of the sulfuric acid process for titanium dioxide production, and is ferrous sulfate heptahydrate.

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