An ore consolidating agent produced from sintered desulfurized ash

Abstract

The invention discloses a kind of ore consolidating agent produced by sintering desulfurization ash, belongs to the field of metallurgical environmental protection technology, and is measured by weight, including the following raw materials: 30-40 parts of desulfurization ash, 40-50 parts of ultrafine composite slag, 25-35 parts of cement, 38-48 parts of modified bentonite, 8-12 parts of gypsum, and 2-3 parts of water reducer; The preparation method of the ore consolidating agent is as follows: desulfurization ash is put into an oven for drying, and then the raw materials are weighed according to the ratio, mixed and stirred for 10-15min, and the material is discharged after mixing evenly, and finally sent into a vacuum tank for storage to obtain the ore consolidating agent. The present invention adopts desulfurization ash and slag micropowder-steel slag composite technology to prepare a consolidating agent, which can not only effectively solve the pollution problem caused by desulfurization ash and slag storage, but also achieve the reuse of waste and meet the requirements of energy conservation and environmental protection; The obtained consolidating agent has good waterproof effect, and has high toughness and can be applied to sand and gravel consolidation.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical environmental protection, and in particular relates to an ore consolidating agent produced by using sintered desulfurization ash. Background Art

[0002] In recent years, higher and higher requirements have been put forward for sulfur dioxide (SO2) emission rates. SO2 emissions from most enterprises have been controlled to a certain extent. However, this has brought about a new problem of increasing emissions of desulfurization ash.

[0003] The semi-dry desulfurization ash has fine particle size and a specific surface area of ​​about 500m 2 / kg, its main components include CaSO3·1 / 2H2O15-30wt%, CaSO4·2H2O21-50wt%, Ca(OH)211-30wt%, water content is about 1%, and fluidity is good.

[0004] Desulfurization ash disposal has long been a challenge. Currently, most steel companies use centralized storage to dispose of desulfurization ash. This method not only occupies a large amount of land, but also increases disposal costs over time and creates a new source of pollution.

[0005] Therefore, how to realize the reuse of desulfurization ash has very important value and application significance.

[0006] Solidifying agents are widely used in infrastructure construction, including filling and reinforcing caverns in mining areas, filling building foundation pits, reinforcing dams and slope protection in water conservancy projects, and supporting freight yards and road foundations. Existing solidifying agents, which mostly use lime and cement, can achieve the required strength, but they suffer from poor water resistance, impermeability, and corrosion resistance, slow curing, low early strength, and require significant cement resources. There are also various high-strength soil solidifying agents formulated with sand as fine aggregate and gravel as coarse aggregate, suitable for different consolidation applications. While these agents are effective, they are expensive to produce. Summary of the Invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and provide an ore consolidating agent produced from sintered desulfurized ash.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] An ore consolidating agent produced from sintered desulfurized ash, comprising the following raw materials, calculated by weight: 30-40 parts of desulfurized ash, 40-50 parts of ultrafine composite slag, 25-35 parts of cement, 38-48 parts of modified bentonite, 8-12 parts of gypsum, and 2-3 parts of a water reducer;

[0010] The preparation method of the ore consolidating agent comprises the following steps:

[0011] The first step is to put the desulfurized ash into an oven and dry it at 85℃ for 1.5-2h;

[0012] The second step is to weigh the dried desulfurized ash, ultrafine composite slag, cement, modified bentonite, gypsum and water reducer according to the proportion, mix and stir for 10-15 minutes, discharge the materials after mixing evenly, and finally store them in a vacuum tank to obtain the ore consolidating agent.

[0013] Furthermore, the ultrafine composite slag is prepared by compounding slag powder, microsilica powder, calcium chloride and aluminum chloride in a mass ratio of 50:10-20:5-8:10-12, and its particle size is below 20 μm.

[0014] Ultrafine composite slag can not only realize the reuse of smelting slag, but also improve the waterproof performance of the consolidating agent through the compound use of calcium chloride and aluminum chloride.

[0015] Furthermore, the modified bentonite is prepared by the following steps:

[0016] Bentonite and quartz sand are heated and dried, then placed in a calcining furnace, and then water glass and quicklime are added. The mixture is calcined at 700-800°C for 1 hour, then heated to 1150-1250°C and sintered for 2 hours, and then quickly cooled to room temperature (the cooling time to room temperature is controlled to not exceed 1 hour), ground, and passed through a 300-mesh sieve to obtain modified bentonite; the usage ratio of bentonite, quartz sand, water glass and quicklime is 50:40-50:3-4:6-7.

[0017] After being modified, bentonite is calcined with quartz sand, water glass and quicklime, which can effectively improve the toughness of the consolidating agent and expand its scope of use.

[0018] Beneficial effects of the present invention:

[0019] The present invention adopts the composite technology of desulfurization ash and slag powder-steel slag to prepare the consolidating agent, which can not only effectively solve the pollution problem caused by the storage of desulfurization ash and slag, but also achieve waste recycling and meet the requirements of energy conservation and environmental protection; the obtained consolidating agent has good waterproof effect and high toughness, and can be used for sand and gravel consolidation. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] Example 1

[0022] Preparation of modified bentonite:

[0023] 500g of bentonite and 400g of quartz sand were heated and dried and placed in a calcining furnace. Then, 30g of water glass and 60g of quicklime were added. The mixture was calcined at 700°C for 1h, then heated to 1150°C and sintered for 2h. The mixture was then quickly cooled to room temperature (the cooling time to room temperature was controlled to be no more than 1h), ground, and passed through a 300-mesh sieve to obtain modified bentonite.

[0024] Example 2

[0025] Preparation of modified bentonite:

[0026] 500g of bentonite and 500g of quartz sand were heated and dried and placed in a calcining furnace. Then, 40g of water glass and 70g of quicklime were added. The mixture was calcined at 800°C for 1h, then heated to 1250°C and sintered for 2h. The mixture was then quickly cooled to room temperature (the cooling time to room temperature was controlled to be no more than 1h), ground, and passed through a 300-mesh sieve to obtain modified bentonite.

[0027] Example 3

[0028] An ore consolidating agent produced from sintered desulfurized ash is prepared by the following steps:

[0029] The first step is to put the desulfurized ash into an oven and dry it at 85°C for 1.5 hours; 500g of slag powder, 100g of microsilica powder, 50g of calcium chloride, and 100g of aluminum chloride are mixed evenly and ground to a particle size of less than 20μm to obtain ultrafine composite slag for later use;

[0030] The second step is to weigh 300g of dried desulfurized ash, 400g of ultrafine composite slag, 250g of cement, 380g of modified bentonite, 80g of gypsum and 20g of water reducer, mix and stir for 10 minutes, discharge the materials after mixing evenly, and finally store them in a vacuum tank to obtain the ore consolidating agent.

[0031] Example 4

[0032] An ore consolidating agent produced from sintered desulfurized ash is prepared by the following steps:

[0033] The first step is to put the desulfurized ash into an oven and dry it at 85°C for 1.8 hours; 500g of slag powder, 150g of microsilica powder, 65g of calcium chloride, and 110g of aluminum chloride are mixed evenly and ground to a particle size of less than 20μm to obtain ultrafine composite slag for later use;

[0034] The second step is to weigh 350g of dried desulfurized ash, 450g of ultrafine composite slag, 300g of cement, 430g of modified bentonite, 100g of gypsum and 25g of water reducer, mix and stir for 13 minutes, discharge the mixture after mixing evenly, and finally store it in a vacuum tank to obtain the ore consolidating agent.

[0035] Example 5

[0036] An ore consolidating agent produced from sintered desulfurized ash is prepared by the following steps:

[0037] The first step is to put the desulfurized ash into an oven and dry it at 85°C for 2 hours; 500g of slag powder, 200g of microsilica powder, 80g of calcium chloride, and 120g of aluminum chloride are mixed evenly and ground to a particle size of less than 20μm to obtain ultrafine composite slag for later use;

[0038] The second step is to weigh 400g of dried desulfurized ash, 500g of ultrafine composite slag, 350g of cement, 480g of modified bentonite, 120g of gypsum and 30g of water reducer, mix and stir for 15 minutes, discharge the materials after mixing evenly, and finally store them in a vacuum tank to obtain the ore consolidating agent.

[0039] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0040] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. An ore consolidating agent produced from sintered desulfurized ash, characterized in that: The raw materials include the following according to weight: 30-40 parts of desulfurized ash, 40-50 parts of ultrafine composite slag, 25-35 parts of cement, 38-48 parts of modified bentonite, 8-12 parts of gypsum, and 2-3 parts of water reducing agent; The ultrafine composite slag is prepared by mixing slag powder, microsilica powder, calcium chloride and aluminum chloride in a mass ratio of 50:10-20:5-8:10-12, and its particle size is less than 20 μm; The modified bentonite is prepared by the following steps: The bentonite and quartz sand were heated and dried, and then placed in a calcining furnace, and then water glass and quicklime were added, and calcined at 700-800°C for 1 hour, and then heated to 1150-1250°C and sintered for 2 hours, and then quickly cooled to room temperature, ground, and passed through a 300-mesh sieve to obtain modified bentonite; The preparation method of the ore consolidating agent comprises the following steps: The first step is to put the desulfurized ash into an oven and dry it at 85℃ for 1.5-2h; The second step is to weigh the dried desulfurized ash, ultrafine composite slag, cement, modified bentonite, gypsum and water reducer according to the proportion, mix and stir for 10-15 minutes, discharge the materials after mixing evenly, and finally store them in a vacuum tank to obtain the ore consolidating agent.

2. The ore consolidating agent produced from sintered desulfurized ash according to claim 1, characterized in that: During the rapid cooling process, the time for cooling to room temperature is controlled to be no more than 1 hour.

3. The ore consolidating agent produced from sintered desulfurized ash according to claim 1, characterized in that: The usage ratio of bentonite, quartz sand, water glass and quicklime is 50:40-50:3-4:6-7.