Cement-based cementitious material prepared from electrolytic manganese residues and preparation method of cement-based cementitious material

Abstract

The invention discloses a preparation method of a cement-based cementing material prepared from electrolytic manganese residues, which comprises the following steps: 1) pretreatment: carrying out ball milling on the electrolytic manganese residues for 5 minutes by using a quick ball mill, and sieving by using a 200-320-mesh sieve; 2) treating the raw materials: washing the raw materials with water or calcining the raw materials at 700-1100 DEG C; 3) burdening: according to the mass percentage of each raw material: 70-90 wt% of p.o42.5 cement powder, 10-30 wt% of water-washed electrolytic manganese residue powder and 10-30 wt% of calcined electrolytic manganese residue powder, selecting the cement powder, the water-washed electrolytic manganese residue powder and the calcined electrolytic manganese residue powder, and mixing to obtain a mixture; 4) cement hydration: mixing and stirring the cement mixture, water and standard sand according to the mass ratio of 1: 0.5: 3 to obtain cement mortar; 5) shaping: pouring the mortar into a mold for curing, and demolding after 24 hours to obtain a cement mortar test block; and (6) cement curing. According to the method, harmful substances in the electrolytic manganese residues can be greatly removed and greatly utilized in the cement, and the method has the advantages of being environmentally friendly and simple in process.

Description

Technical Field

[0001] The invention relates to the field of environmentally friendly building materials, and in particular to a cement-based gelling material prepared from electrolytic manganese slag and a preparation method thereof. Background Art

[0002] In the process of electrolytic manganese production, a large amount of electrolytic manganese slag is produced. The main phase composition of electrolytic manganese slag is SiO2, CaSO4·2H2O, MgSO4·7H2O and other minerals, among which SiO2 can reach 39.31%, Al2O3 can reach 11.31%, and Fe2O3 can reach 4.78%. Electrolytic manganese slag usually also contains a variety of harmful substances, such as non-metallic components SO4 2+ NH4 + , Se, etc. as well as metal components Co, Ni, Ag, Cr, etc., will cause serious pollution to the environment if not properly handled.

[0003] At present, the treatment methods of electrolytic manganese slag mainly include landfill and stockpiling, which not only occupy a large amount of land resources, but also have potential environmental pollution risks. Therefore, it is of great significance to develop an environmentally friendly and efficient method for treating electrolytic manganese slag.

[0004] Research by domestic and foreign scholars has shown that electrolytic manganese slag can be used in the preparation of building materials. The rich silicon and aluminum elements in electrolytic manganese slag are the components that form the glass phase. It also has a certain gelling property in water and can be used as an admixture or additive for cement and concrete in building materials. At the same time, the construction industry can also consume a large amount of electrolytic manganese slag, which provides an application route for the preparation of cement cementitious materials from electrolytic manganese slag.

[0005] Therefore, the preparation of a cement-based cementitious material that can be used in large quantities of electrolytic manganese slag without causing pollution to the environment and can meet the requirements of the construction industry is in line with the path of comprehensive resource utilization of electrolytic manganese slag. Summary of the invention

[0006] The purpose of the present invention is to provide a cement-based cementitious material prepared from electrolytic manganese slag and a preparation method thereof, which can effectively utilize the effective components in the electrolytic manganese slag and remove the original harmful components in the electrolytic manganese slag, so as to prepare a cement-based cementitious material with good mechanical strength and safety, so as to solve the problems of land occupation and accumulation and environmental pollution caused by the electrolytic manganese slag.

[0007] The specific technical solutions are as follows:

[0008] The first aspect of the present invention is to provide a method for preparing a cement-based cementitious material from electrolytic manganese slag, wherein the raw materials mainly include the following components in parts by weight:

[0009] p.o42.5 cement powder 70-90wt%, washed electrolytic manganese slag powder 10-30wt%, calcined electrolytic manganese slag powder 10-30wt%;

[0010] The preparation method thereof comprises the following steps:

[0011] (1) Pretreatment: The electrolytic manganese slag was ball milled for 5 min using a rapid ball mill and passed through a 200-320 mesh sieve;

[0012] (2) Raw material processing: Wash the raw materials with water, and then put the dried powder into a box furnace for calcination;

[0013] (3) Batching: According to the weight percentage of each raw material: PO42.5 cement powder 70-90wt%, washed electrolytic manganese slag powder 10-30wt%, calcined electrolytic manganese slag powder 10-30wt%, select PO42.5 cement powder, washed electrolytic manganese slag powder, calcined electrolytic manganese slag powder and mix to obtain a cement mixture;

[0014] (4) cement hydration; mixing and stirring in a mass ratio of cement mixture: water: standard sand = 1:0.5:3 to obtain cement mortar;

[0015] (5) Shaping: Pour the cement mortar into a 40 mm × 40 mm × 160 mm mold, place it in a constant humidity cement curing box, wait for 24 hours, and then demold it to obtain a cement mortar test block;

[0016] (6) Cement curing: After finalization and demoulding, place the mortar test block in a water curing box for curing. Wait until the cement age reaches 72h±45min and 28d±8h before taking it out for cement mortar strength test.

[0017] Furthermore, in step (2), the liquid-to-solid ratio of water washing is 5:1, the stirring speed is 100 r / min, and the water washing time is 30 min.

[0018] Furthermore, the water washing in step (2) should be carried out at normal temperature and pressure.

[0019] Furthermore, the calcination process in step (2) is: heating to 700-1100° C. at a heating rate of 3-8° C. / min and keeping the temperature for 0.1-2 h.

[0020] Furthermore, in step (5), the temperature of the constant temperature and humidity cement curing box should be maintained at 20°C ± 1°C, and the relative humidity should not be less than 50%.

[0021] Furthermore, the water temperature in the cement water curing box in step (6) should be maintained at 20°C ± 1°C.

[0022] The second aspect of the present invention is to provide a cement-based cementitious material prepared by using the electrolytic manganese slag obtained by the above preparation method.

[0023] Compared with the prior art, the beneficial effects of the present invention are: the effective components in the electrolytic manganese slag are effectively utilized, and the pollution to the environment is reduced; the prepared cement-based cementitious material has good mechanical strength and meets the requirements of the construction industry; the original harmful components in the electrolytic manganese slag are removed by water washing or calcining process, ensuring the safety of the material; this method can greatly remove harmful substances in the electrolytic manganese slag and use it in cement in large quantities, and has the advantages of environmental protection and simple process. The method is easy to operate, easy to industrialize and has good application prospects. The present invention provides an environmentally friendly and efficient electrolytic manganese slag treatment method, which not only solves the environmental pollution problem caused by electrolytic manganese slag, but also provides a new way for the resource utilization of electrolytic manganese slag. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments below. The described embodiments are only part of the embodiments of the present invention and do not include all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the present invention are within the scope of protection of the present invention.

[0025] Example 1

[0026] A cement-based cementitious material prepared from electrolytic manganese slag, the preparation of which comprises the following steps:

[0027] (1) Pretreatment: The electrolytic manganese slag was ball milled for 5 min using a rapid ball mill and passed through a 200-320 mesh sieve;

[0028] (2) Raw material treatment: washing with water at a liquid-to-solid ratio of 5:1, a stirring speed of 100 r / min, and a duration of 30 min;

[0029] (3) Batching: weigh and mix the raw materials according to the mass percentage of each raw material: 90wt% of p.o42.5 cement powder and 10wt% of washed electrolytic manganese slag powder to obtain a mixed material;

[0030] (4) cement hydration; mixing the raw materials in a mass ratio of cement mixture: water: standard sand = 1:0.5:3 to obtain cement mortar;

[0031] (5) Shaping: Pour the cement mortar into a 40 mm × 40 mm × 160 mm mold, place it in a constant temperature and humidity cement curing box, wait for 24 hours and then demold it to obtain a cement mortar test block;

[0032] (6) Cement curing: After finalization and demoulding, place the mortar test block in a water curing box for curing. Wait until the cement age reaches 72h±45min and 28d±8h before taking it out for cement mortar strength test.

[0033] Tests show that the cement-based cementitious material provided in this embodiment has an average flexural strength of 11.26 MPa at 72 hours, and an average compressive strength of 23.25 MPa at 72 hours.

[0034] Example 2

[0035] A cement-based cementitious material prepared from electrolytic manganese slag, the preparation of which comprises the following steps:

[0036] (1) Pretreatment: The electrolytic manganese slag was ball milled for 5 min using a rapid ball mill and passed through a 200-320 mesh sieve;

[0037] (2) Raw material processing: The dried powder is placed in a box furnace for sintering. The sintering process is: heating up to 900°C at a heating rate of 5°C / min and then keeping the temperature for 0.3h;

[0038] (3) Batching: weigh and mix the raw materials according to the mass percentage of each raw material: 90wt% of p.o42.5 cement powder and 10wt% of calcined electrolytic manganese slag powder to obtain a mixed material;

[0039] (4) cement hydration; mixing the raw materials in a mass ratio of cement mixture: water: standard sand = 1:0.5:3 to obtain cement mortar;

[0040] (5) Shaping: Pour the cement mortar into a 40 mm × 40 mm × 160 mm mold, place it in a constant temperature and humidity cement curing box, wait for 24 hours and then demold it to obtain a cement mortar test block;

[0041] (6) Cement curing: After finalization and demoulding, place the mortar test block in a water curing box for curing. Wait until the cement age reaches 72h±45min and 28d±8h before taking it out for cement mortar strength test.

[0042] Tests show that the cement-based cementitious material provided in this embodiment has an average flexural strength of 10.93 MPa after 72 hours, and an average compressive strength of 23.88 MPa after 72 hours.

[0043] Example 3

[0044] A cement-based cementitious material prepared from electrolytic manganese slag, the preparation of which comprises the following steps:

[0045] (1) Pretreatment: The electrolytic manganese slag was ball milled for 5 min using a rapid ball mill and passed through a 200-320 mesh sieve;

[0046] (2) Raw material processing: The dried powder is placed in a box furnace for sintering. The sintering process is: heating up to 900°C at a heating rate of 5°C / min and then keeping the temperature for 0.3h;

[0047] (3) Batching: weigh and mix the raw materials according to the mass percentage of each raw material: 85wt% of p.o42.5 cement powder and 15wt% of calcined electrolytic manganese slag powder to obtain a mixed material;

[0048] (4) cement hydration; mixing the raw materials in a mass ratio of cement mixture: water: standard sand = 1:0.5:3 to obtain cement mortar;

[0049] (5) Shaping: Pour the cement mortar into a 40 mm × 40 mm × 160 mm mold, place it in a constant temperature and humidity cement curing box, wait for 24 hours and then demold it to obtain a cement mortar test block;

[0050] (6) Cement curing: After finalization and demoulding, place the mortar test block in a water curing box for curing. Wait until the cement age reaches 72h±45min and 28d±8h before taking it out for cement mortar strength test.

[0051] Tests show that the cement-based cementitious material provided in this embodiment has an average flexural strength of 9.86 MPa at 72 hours, and an average compressive strength of 22.08 MPa at 72 hours.

[0052] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing a cement-based gelling material prepared from electrolytic manganese slag, characterized in that: The raw materials mainly include the following components by weight: p.o42.5 cement powder 70-90wt%, washed electrolytic manganese slag powder 10-30wt%, calcined electrolytic manganese slag powder 10-30wt%; The preparation method thereof comprises the following steps: (1) Pretreatment: The electrolytic manganese slag was ball milled for 5 min using a rapid ball mill and passed through a 200-320 mesh sieve; (2) Raw material processing: washing the raw materials with water, or placing the dried powder into a box furnace for calcination; (3) Batching: According to the mass percentage of each raw material: p.o42.5 cement powder 70-90wt%, washed electrolytic manganese slag powder 10-30wt%, calcined electrolytic manganese slag powder 10-30wt%, p.o42.5 cement powder, washed electrolytic manganese slag powder, calcined electrolytic manganese slag powder are selected and mixed to obtain a cement mixture; (4) cement hydration; mixing and stirring in a mass ratio of cement mixture: water: standard sand = 1:0.5:3 to obtain cement mortar; (5) Shaping: Pour the cement mortar into a 40 mm × 40 mm × 160 mm mold, place it in a constant temperature and humidity cement curing box, wait for 24 hours and then demold it to obtain a cement mortar test block; (6) Cement curing: After finalization and demoulding, place the mortar test block in a water curing box for curing. Wait until the cement age reaches 72h±45min and 28d±8h before taking it out for cement mortar strength test.

2. The method for preparing cement-based cementitious material prepared from electrolytic manganese slag according to claim 1, characterized in that: In step (2), the liquid-to-solid ratio of water washing is 5:1, the stirring speed is 100 r / min, and the water washing time is 30 min.

3. The method for preparing cement-based cementitious material prepared from electrolytic manganese slag according to claim 1, characterized in that: The water washing in step (2) should be carried out at normal temperature and pressure.

4. The method for preparing cement-based cementitious material prepared from electrolytic manganese slag according to claim 1, characterized in that: The calcination process in step (2) is as follows: heating to 700-1100° C. at a heating rate of 3-8° C. / min and keeping the temperature for 0.1-2 h.

5. The method for preparing cement-based cementitious material prepared from electrolytic manganese slag according to claim 1, characterized in that: In step (2), the electrolytic manganese slag powder is naturally cooled in the furnace before being taken out.

6. The method for preparing cement-based gelling material prepared from electrolytic manganese slag according to claim 1, characterized in that: In step (5), the temperature of the constant temperature and humidity cement curing box should be maintained at 20°C ± 1°C, and the relative humidity should not be less than 50%.

7. The method for preparing cement-based cementitious material prepared from electrolytic manganese slag according to claim 1, characterized in that: In step (6), the water temperature in the cement water curing box should be maintained at 20°C ± 1°C.

8. A low-temperature fast-firing ceramic aggregate prepared from electrolytic manganese slag, characterized in that: Prepared according to any one of the preparation methods of claims 1-7.