Filling curing agent for preparing mine superfine tailing slag from solid waste residues and use thereof

Abstract

Disclosed are a filling curing agent for preparing mine superfine tailing slag from solid waste residues, which belongs to the field of preparation of solid waste residues. The filling curing agent comprises a cementing material component obtained by means of a wet milling process while grinding, and an exciting agent component obtained by means of a mixing and stirring process; the cementing material component comprises, in parts by mass, 45-50 parts of blast furnace slag powder, 35-40 parts of steel slag powder, 15-20 parts of coal ash and 53.8 parts of water, and the exciting agent component comprises 100 parts of desulfurized gypsum powder and 59.5-60.6 parts of an activating agent; and the weight of the exciting agent component accounts for 10-15% of the weight of the filling curing agent. The filling curing agent disclosed in the present invention has low filling cost, high filling body strength and good durability, which reduces the occupation of land resources, reduces the impact on the ecological environment and residents' lives, realizes a virtuous cycle of mining and filling, and has good industrial prospects and social benefits.

Description

A filling and curing agent for preparing ultrafine mine tailings slag from solid waste slag and its application Technical Field

[0001] The present invention relates to the field of solid waste slag preparation, in particular to a filling and curing agent for preparing ultrafine mine tailings slag from solid waste slag and application thereof. Background Art

[0002] With the rapid mining, a large amount of solid waste is generated, which in turn causes a series of environmental problems. The solid waste accumulates on the surface, occupies a large amount of arable land, and brings serious harm to the ecological environment and residents' lives.

[0003] The use of solid waste for mine filling is a new economical and environmentally friendly technology in mining in recent years. This method can not only process and utilize abandoned solid waste, but also fill the mine recovery area, protect the surface safety of the goaf, and realize the virtuous cycle of mining and filling. It is a trend of sustainable development of mining.

[0004] During the backfilling process, ensuring the backfill has a certain strength is paramount, and cementitious materials are a key factor in determining backfill strength. Existing backfill curing agents suffer from high costs, low backfill strength, and poor durability, making them difficult to meet the requirements of mining companies in terms of both performance and cost. Summary of the Invention

[0005] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to provide a filling curing agent with low filling cost, high filling body strength, good durability, economy and environmental protection, and good industrial prospects and social benefits.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The present invention provides a filling and curing agent for preparing ultrafine mine tailings using solid waste slag, comprising a gelling material component obtained by simultaneous grinding using a wet grinding process and an activator component obtained by a mixing and stirring process;

[0008] In parts by mass, the cementitious material component includes 45-50 parts of blast furnace slag powder, 35-40 parts of steel slag powder, 15-20 parts of fly ash and 53.8 parts of water; the activator component includes 100 parts of desulfurized gypsum powder and 59.5-60.6 parts of activator;

[0009] The weight ratio of the activator component accounts for 10%-15% of the filling curing agent.

[0010] The preferred technical solution of the present invention is that the blast furnace slag powder is solid waste formed by oxidizing, reducing and melting impurities in iron ore and ash in the charge at high temperature and then quenching with water during the blast furnace smelting process of the steel plant, and the ultrafine slag powder is obtained by drying, grinding and powder selection.

[0011] The preferred technical solution of the present invention is that the specific surface area of ​​the ultrafine slag powder is greater than 600m 2 / kg, the product grade reaches S95 or above. The product grade of the ultrafine slag powder is certified by GB / T 18046-2017 "Granulated blast furnace slag powder for cement, mortar and concrete".

[0012] The preferred technical solution of the present invention is that the steel slag powder is solid waste including olivine, dicalcium silicate and tricalcium silicate produced by transferring steel slag into a furnace and continuously adding limestone during the steelmaking process, and the steel slag powder is obtained by drying, grinding and powder selection of the solid waste obtained above.

[0013] The preferred technical solution of the present invention is that, in parts by mass, the activator includes 1-2 parts of caustic soda, 1-2 parts of alkylolamide, 0.3-0.5 parts of molasses, 0.3-0.5 parts of glycerol, and 55.8-56.2 parts of water.

[0014] The preferred technical solution of the present invention is that the desulfurization gypsum powder uses limestone powder as a desulfurizer, and absorbent slurry is sprayed into the absorption tower to fully contact and fuse with the flue gas, and the flue gas is washed, so that SO2 in the flue gas reacts with the slurry CaCO3 and the strong oxygen-rich gasified air blown in to produce desulfurization gypsum, and the desulfurization gypsum is dried and ground to form desulfurization gypsum powder.

[0015] A preferred technical solution of the present invention is that the fly ash is solid waste generated during the combustion process, including ash and fly ash.

[0016] The invention discloses an application of a filling curing agent in preparing a filling material. The filling curing agent and ultrafine tailings are mixed and stirred in a certain proportion to prepare a filling slurry with a concentration of 60%-68%.

[0017] The preferred technical solution of the present invention is that the ultrafine tailings are tailings with fine particles less than 0.075 mm produced by metal mines during the mineral processing process, and the ultrafine tailings account for more than 70% of the metal mine tailings.

[0018] The preferred technical solution of the present invention is that the combined mass ratio of the filling solidifying agent to the ultrafine tailings slag is 1:4, 1:6 or 1:8.

[0019] The beneficial effects of the present invention are as follows: the present application prepares a filling slurry by mixing the prepared cementitious material component and the activator component, adding metal tailings slag and stirring evenly, and the curing strength of the obtained filling slurry is significantly and effectively improved compared with the commercially available curing agent, and the durability is good, which reduces the waiting time for the filling operation. The filling curing agent prepared by the present invention can effectively utilize a large amount of solid waste, has low filling cost, reduces land resource occupation, reduces the impact on the ecological environment and residents' lives, realizes a virtuous cycle of mining and filling, and has good industrial prospects and social benefits.

[0020] The present invention provides a filling curing agent which has low filling cost, high filling body strength, good durability, is economical and environmentally friendly, and has good industrial prospects and social benefits. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0022] Example 1

[0023] A filling and curing agent for preparing ultrafine mine tailings using solid waste residue, comprising a gelling material component obtained by simultaneous grinding using a wet grinding process and an activator component obtained by a mixing and stirring process;

[0024] The cementitious material components include 45 parts of blast furnace slag powder, 40 parts of steel slag powder, 15 parts of fly ash, and 53.8 parts of water. The blast furnace slag powder is a solid waste formed by oxidizing, reducing, and melting impurities in iron ore and ash in the charge at high temperature during the blast furnace smelting process of the steel plant, and then quenching with water. The ultrafine slag powder is obtained by drying, grinding, and selecting the slag powder. The specific surface area is 602m 2 / kg, and the product grade reaches S95;

[0025] In parts by mass, the activator component includes 100 parts of desulfurized gypsum powder, 2 parts of caustic soda, 1 part of alkylolamide, 0.3 parts of molasses, 0.4 parts of glycerol, and 55.8 parts of water;

[0026] Blast furnace slag powder, steel slag powder, fly ash and water are added to a wet grinder in accordance with prescribed fractions for mixing and grinding to obtain a cementitious material component; desulfurized gypsum powder, flake caustic soda, alkyl alcohol amide, molasses, glycerin and water are added to a mixing and stirring device in accordance with prescribed fractions for thorough mixing to obtain an activator component.

[0027] The prepared cementitious material component and activator component are mixed to obtain a filling curing agent, wherein the ratio of the cementitious material component and the activator component in the filling material is 9:1, and the weight ratio of the activator component accounts for 10% of the filling curing agent; the filling curing agent and the copper tailings are added to a mixer in a ratio of 1:4 and stirred evenly to obtain a filling slurry A, which is transported to the underground goaf through a filling system for filling. The fineness of the copper tailings (-200 mesh) is 75%, the tailings concentration of the copper tailings is 65%, and the obtained filling slurry A has a concentration of 60%, a water seepage rate of 1%, and an expansion of 210mm;

[0028] A commercially available curing agent and gold tailings were added to a mixer in a ratio of 1:4 and mixed evenly to obtain a filling slurry E. This filling slurry E was then transported to the underground goaf via a filling system for filling. The gold tailings fineness (-200 mesh) was 93%, the tailings concentration was 65%, and the obtained filling slurry E had a concentration of 65%, a water seepage rate of 1%, and an expansion of 170 mm.

[0029] Samples of the prepared filling slurry A and filling slurry E were taken, and their 3d, 7d, and 28d compressive strengths were measured. The strengths of the filling bodies are shown in Table 1.

[0030] Table 1

[0031] Example 2

[0032] A filling and curing agent for preparing ultrafine mine tailings using solid waste residue, comprising a gelling material component obtained by simultaneous grinding using a wet grinding process and an activator component obtained by a mixing and stirring process;

[0033] The cementitious material components include 45 parts of blast furnace slag powder, 35 parts of steel slag powder, 20 parts of fly ash, and 53.8 parts of water. The blast furnace slag powder is a solid waste formed by oxidizing, reducing, and melting impurities in iron ore and ash in the charge at high temperature during the blast furnace smelting process of the steel plant, and then quenching with water. The ultrafine slag powder is obtained by drying, grinding, and selecting the slag powder. The specific surface area is 611m 2 / kg, and the product grade reaches S95;

[0034] In parts by mass, the activator component includes 100 parts of desulfurized gypsum powder, 2 parts of caustic soda, 1.5 parts of alkylolamide, 0.3 parts of molasses, 0.4 parts of glycerol, and 56.1 parts of water;

[0035] Blast furnace slag powder, steel slag powder, fly ash and water are added to a wet grinder in accordance with prescribed fractions for mixing and grinding to obtain a cementitious material component; desulfurized gypsum powder, flake caustic soda, alkyl alcohol amide, molasses, glycerin and water are added to a mixing and stirring device in accordance with prescribed fractions for thorough mixing to obtain an activator component.

[0036] The prepared cementitious material component and activator component are mixed to obtain a filling curing agent, wherein the ratio of the cementitious material component and the activator component in the filling material is 85:15, and the weight ratio of the activator component accounts for 15% of the filling curing agent; the filling curing agent and the gold tailings are added to a mixer in a ratio of 1:4 and stirred evenly to obtain a filling slurry B, which is transported to the underground goaf through a filling system for filling. The fineness of the gold tailings (-200 mesh) is 93%, the tailings concentration of the gold tailings is 65%, and the obtained filling slurry B has a concentration of 60%, a water seepage rate of 0, and an expansion of 187 mm;

[0037] A commercially available curing agent and gold tailings were added to a mixer in a ratio of 1:4 and mixed evenly to obtain a filling slurry E. This filling slurry E was then transported to the underground goaf via a filling system for filling. The gold tailings fineness (-200 mesh) was 93%, the tailings concentration was 65%, and the obtained filling slurry E had a concentration of 65%, a water seepage rate of 1%, and an expansion of 170 mm.

[0038] Samples of the prepared filling slurry B and filling slurry E were taken, and their 3d, 7d, and 28d compressive strengths were measured. The strengths of the filling bodies are shown in Table 2.

[0039] Table 2

[0040] Example 3

[0041] A filling and curing agent for preparing ultrafine mine tailings using solid waste residue, comprising a gelling material component obtained by simultaneous grinding using a wet grinding process and an activator component obtained by a mixing and stirring process;

[0042] The cementitious material components include 48 parts of blast furnace slag powder, 37 parts of steel slag powder, 15 parts of fly ash, and 53.8 parts of water. The blast furnace slag powder is a solid waste formed by oxidizing, reducing, and melting impurities in iron ore and ash in the charge at high temperature during the blast furnace smelting process of the steel plant, and then quenching with water. The ultrafine slag powder is obtained by drying, grinding, and selecting the slag powder. The specific surface area is 608m 2 / kg, and the product grade reaches S95;

[0043] In parts by mass, the activator component includes 100 parts of desulfurized gypsum powder, 1.5 parts of caustic soda, 2 parts of alkylolamide, 0.4 parts of molasses, 0.5 parts of glycerol, and 56.2 parts of water;

[0044] Blast furnace slag powder, steel slag powder, fly ash and water are added to a wet grinder in accordance with prescribed fractions for mixing and grinding to obtain a cementitious material component; desulfurized gypsum powder, flake caustic soda, alkyl alcohol amide, molasses, glycerin and water are added to a mixing and stirring device in accordance with prescribed fractions for thorough mixing to obtain an activator component.

[0045] The prepared cementitious material component and activator component are mixed to obtain a filling curing agent, wherein the ratio of the cementitious material component and the activator component in the filling material is 85:15, and the weight ratio of the activator component accounts for 15% of the filling curing agent; the filling curing agent and the gold tailings are added to a mixer in a ratio of 1:6 and stirred evenly to obtain a filling slurry C, which is transported to the underground goaf through a filling system for filling. The fineness of the gold tailings (-200 mesh) is 93%, the tailings concentration of the gold tailings is 65%, and the obtained filling slurry C has a concentration of 65%, a water seepage rate of 0, and an expansion of 185mm;

[0046] A commercially available curing agent and gold tailings were added to a mixer in a ratio of 1:4 and mixed evenly to obtain a filling slurry E. This filling slurry E was then transported to the underground goaf via a filling system for filling. The gold tailings fineness (-200 mesh) was 93%, the tailings concentration was 65%, and the obtained filling slurry E had a concentration of 65%, a water seepage rate of 1%, and an expansion of 170 mm.

[0047] Samples of the prepared filling slurry C and filling slurry E were taken, and their 3d, 7d, and 28d compressive strengths were measured. The strengths of the filling bodies are shown in Table 3.

[0048] Table 3

[0049] Example 4

[0050] A filling and curing agent for preparing ultrafine mine tailings using solid waste residue, comprising a gelling material component obtained by simultaneous grinding using a wet grinding process and an activator component obtained by a mixing and stirring process;

[0051] The cementitious material components include 50 parts of blast furnace slag powder, 35 parts of steel slag powder, 15 parts of fly ash, and 53.8 parts of water. The blast furnace slag powder is a solid waste formed by oxidizing, reducing, and melting impurities in iron ore and ash in the charge at high temperature during the blast furnace smelting process of the steel plant, and then quenching with water. The ultrafine slag powder is obtained by drying, grinding, and selecting the slag powder. The specific surface area is 620m 2 / kg, and the product grade reaches S95;

[0052] In parts by mass, the activator component includes 100 parts of desulfurized gypsum powder, 1 part of caustic soda, 2 parts of alkylolamide, 0.5 parts of molasses, 0.3 parts of glycerol, and 55.9 parts of water;

[0053] Blast furnace slag powder, steel slag powder, fly ash and water are added to a wet grinder in accordance with prescribed fractions for mixing and grinding to obtain a cementitious material component; desulfurized gypsum powder, flake caustic soda, alkyl alcohol amide, molasses, glycerin and water are added to a mixing and stirring device in accordance with prescribed fractions for thorough mixing to obtain an activator component.

[0054] The prepared cementitious material component and activator component are mixed to obtain a filling curing agent, wherein the ratio of the cementitious material component and the activator component in the filling material is 85:15, and the weight ratio of the activator component accounts for 15% of the filling curing agent; the filling curing agent and the gold tailings are added to a mixer at a ratio of 1:8 and stirred evenly to obtain a filling slurry D, which is transported to the underground goaf through a filling system for filling. The fineness of the gold tailings (-200 mesh) is 93%, the tailings concentration of the gold tailings is 65%, and the obtained filling slurry has a concentration of 68%, a water seepage rate of 0, and an expansion of 174mm;

[0055] A commercially available curing agent and gold tailings were added to a mixer in a ratio of 1:4 and mixed evenly to obtain a filling slurry E. This filling slurry E was then transported to the underground goaf via a filling system for filling. The gold tailings fineness (-200 mesh) was 93%, the tailings concentration was 65%, and the obtained filling slurry E had a concentration of 65%, a water seepage rate of 1%, and an expansion of 170 mm.

[0056] Samples of the prepared filling slurry D and filling slurry E were taken, and their 3d, 7d, and 28d compressive strengths were measured. The strengths of the filling bodies are shown in Table 4.

[0057] Table 4

[0058] The filling curing agent prepared by the present invention using solid waste residue can effectively utilize a large amount of solid waste compared to the existing technology, with low filling cost, reduced land resource occupation, reduced impact on the ecological environment and residents' lives, and realize a virtuous cycle of mining and filling, with good industrial prospects and social benefits; while ensuring the curing effect of the curing agent, the present invention reduces the production cost of the curing agent, and the curing strength of the cemented filling body is high, the strength can reach more than 2.4 MPa after 7 days, reducing the waiting time for the filling operation, and the later strength can be continuously enhanced, the strength can reach more than 3.1 MPa after 28 days, and the strength can reach more than 3.8 MPa after 60 days. Compared with commercially available curing agents, the curing strength of the curing agent of the present invention is significantly and effectively improved, and the durability is good.

[0059] The present invention is described through preferred embodiments. Those skilled in the art will appreciate that various modifications or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A filling and curing agent for preparing ultrafine tailings slag from solid waste, characterized in that: It includes a gelling material component obtained by simultaneous grinding using a wet grinding process and an activator component obtained by a mixing and stirring process; In parts by mass, the cementitious material component includes 45-50 parts of blast furnace slag powder, 35-40 parts of steel slag powder, 15-20 parts of fly ash and 53.8 parts of water, and the activator component includes 100 parts of desulfurized gypsum powder and 59.5-60.6 parts of activator; The weight ratio of the activator component accounts for 10%-15% of the filling curing agent.

2. The filling and curing agent for preparing ultrafine tailings slag from solid waste slag according to claim 1, characterized in that: The blast furnace slag powder is a solid waste formed by oxidizing, reducing and melting impurities in iron ore and ash in furnace charge at high temperature and then quenching with water during the blast furnace smelting process of the steel plant. The ultra-fine slag powder is obtained by drying, grinding and powder selection.

3. The filling and curing agent for preparing ultrafine tailings slag from solid waste slag according to claim 2, characterized in that: The specific surface area of ​​the ultrafine slag powder is > 600m 2 / kg, and the product grade reaches S95 or above.

4. The filling and curing agent for preparing ultrafine tailings slag from solid waste slag according to claim 1, characterized in that: The steel slag powder is solid waste including olivine, dicalcium silicate and tricalcium silicate produced by transferring steel slag to a furnace and continuously adding limestone during the steelmaking process. The steel slag powder is obtained by drying, grinding and powder selection of the solid waste obtained above.

5. The filling and curing agent for preparing ultrafine tailings slag from solid waste slag according to claim 1, characterized in that: Calculated by weight, the activator includes 1-2 parts of flake caustic soda, 1-2 parts of alkyl alcohol amide, 0.3-0.5 parts of molasses, 0.3-0.5 parts of glycerol, and 55.8-56.2 parts of water.

6. The filling and curing agent for preparing ultrafine tailings slag from solid waste slag according to claim 1, characterized in that: The desulfurized gypsum powder uses limestone powder as a desulfurizer. By spraying absorbent slurry into the absorption tower, it is fully contacted and fused with the flue gas, and the flue gas is washed, so that SO2 in the flue gas reacts with the slurry CaCO3 and the strong oxygen-gasified air blown in to produce desulfurized gypsum. The desulfurized gypsum is dried and ground to form desulfurized gypsum powder.

7. The filling and curing agent for preparing ultrafine tailings slag from solid waste slag according to claim 1, characterized in that: The fly ash is solid waste generated during the combustion process, including slag and fly ash.

8. Use of a filling curing agent according to any one of claims 1 to 7 to prepare a filling material, characterized in that: The filling solidifying agent and the ultra-fine tailings slag are mixed and stirred in proportion to prepare the filling slurry with a concentration of 60%-68%.

9. The use of a filling curing agent for preparing a filling material according to claim 8, characterized in that: The ultra-fine tailings are tailings with fine particles less than 0.075 mm produced in the beneficiation process of metal mines, and the proportion of the ultra-fine tailings in the beneficiation tailings of metal mines is greater than 70%.

10. The use of a filling and curing agent for preparing ultrafine tailings slag from solid waste slag according to claim 8, characterized in that: The combined mass ratio of the filling solidifying agent to the ultrafine tailings slag is 1:4, 1:6 or 1:8.

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