阅读说明：本技术 一种赤泥煤矸石速凝剂的制备方法 (Preparation method of red mud and coal gangue accelerator ) 是由 冯荣 王琨 孟凡然 杨尚权 于 2021-09-02 设计创作，主要内容包括：本发明属于建筑材料技术领域,具体涉及一种赤泥煤矸石速凝剂的制备方法。解决目前铝矾土制备有碱速凝剂产品含碱性大、生产成本高、严重污染环境、浪费矿产资源等问题,结合赤泥大量堆积产生碱性物质污染环境和煤矸石大量堆存产生酸性物质污染环境的现状,将赤泥和煤矸石进行混料,经过晾晒、破碎、活化、球磨、成球、烧制、粉磨,最终得到赤泥煤矸石基速凝剂粉料。本发明具有降低速凝剂的生产成本、减少矿产资源的浪费、增加固废资源化利用、保护生态环境的优点。(The invention belongs to the technical field of building materials, and particularly relates to a preparation method of a red mud coal gangue accelerator. The method solves the problems of high alkalinity, high production cost, serious environmental pollution, waste of mineral resources and the like of the existing bauxite-prepared alkaline accelerator product, combines the current situations that the environment is polluted by alkaline substances generated by the mass accumulation of red mud and the environment is polluted by acidic substances generated by the mass accumulation of coal gangue, mixes the red mud and the coal gangue, and finally obtains the red mud and coal gangue-based accelerator powder through airing, crushing, activating, ball milling, balling, firing and grinding. The invention has the advantages of reducing the production cost of the accelerator, reducing the waste of mineral resources, increasing the utilization of solid waste resources and protecting the ecological environment.)

1. The preparation method of the red mud and coal gangue accelerator is characterized by comprising the following steps:

first, mixing the materials

30-35% by weight: 35% -40%: weighing 25-35% of coal gangue, Bayer process red mud and sintering process red mud, mixing the materials in a mixer for 30min, and wrapping and storing the materials with a plastic film for 2-3 weeks to obtain a mixture;

second step, drying in the sun

Putting the mixture prepared in the first step into a constant-temperature drying box, setting the temperature to be 90 ℃, and drying for 6-8 hours to obtain a dry material;

third step, crushing

Crushing the dry material prepared in the second step to obtain a crushed material;

fourthly, activating the dry materials

Firing the crushed material obtained in the third step to 850 ℃, and performing activation treatment on the crushed material to obtain an active material;

step five, ball milling

Placing the activated dry material obtained in the fourth step into a dry ball mill for ball milling for 1-2 hours to obtain a master batch;

sixth step, master batch sieving

Sieving the master batch obtained in the fifth step by using a 150-mesh sieve to remove particles with the particle size of more than or equal to 106 microns to obtain powder;

seventh step, balling

Putting the powder obtained in the sixth step into a balling disc to prepare a ball material;

eighth step, baking

Putting the ball material prepared in the seventh step into an oven for drying, then putting the ball material into a sagger for burning by an electric kiln, wherein the burning curve is that the temperature is increased from room temperature to 300 ℃, and the time is 1 hour; heating from 300 deg.C to 900 deg.C for 2 h; heating from 900 ℃ to 1050 ℃ for 1h, heating from 1050 ℃ to 1250 ℃ for 2h, preserving the heat at 1250 ℃ for 0.5h, and naturally cooling to room temperature after the heat preservation is finished to obtain a semi-finished product;

ninth step, grinding

Putting the semi-finished product obtained in the eighth step into a dry ball mill for grinding to obtain clinker;

the tenth step, sieving and sealing

And (4) sieving the clinker ground in the ninth step by a 150-mesh sieve, and filling the clinker into a sealing bag for sealing to obtain the red mud coal gangue-based accelerator powder.

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to a preparation method of a red mud coal gangue accelerator.

Background

Aiming at the problems of high alkalinity, high production cost, serious environmental pollution, mineral resource waste and the like of the existing bauxite prepared alkali-containing accelerator product, combining the current situation that the environment is polluted by alkaline substances generated by the accumulation of a large amount of red mud and the environment is polluted by acidic substances generated by the accumulation of a large amount of coal gangue, the key preparation technology for preparing the alkali-free dry powder cement accelerator from the red mud composite coal gangue is involved, the low-cost manufacture of the novel mineral-series alkali-free dry powder cement accelerator is realized, the requirements of energy conservation and environmental protection of building materials are met, the popularization and application of mineral-series accelerator materials are promoted, and a new effective way is opened up by relieving the discharge pressure and high-value conversion and utilization of the coal gangue and the red mud.

The main quick-setting component of the traditional quick-setting agent is aluminous clinker, namely, an alkaline powdery quick-setting agent which is formed by finely grinding clinker which is prepared by burning aluminate, sodium carbonate and quick lime in proportion. The alkaline accelerator product has high alkalinity and high production cost, and has the problems of serious environmental pollution, waste of mineral resources and the like. The high alkali content is not beneficial to the development of the later strength of concrete, increases the risk of harmful alkali aggregate reaction, generates corrosive damage to the skin and body health of constructors and seriously pollutes the environment; the aluminate and the sodium carbonate are important industrial mineral raw materials and chemical raw materials, the aluminate and the sodium carbonate have wide application, and the use of the aluminate and the sodium carbonate for manufacturing the accelerator not only wastes mineral resources, but also causes the manufacturing cost of the accelerator to be high. Liquid accelerators have developed relatively rapidly in recent years, but have fatal defects, such as: poor product adaptability, unstable operation performance, higher mixing amount and high manufacturing cost. Therefore, the powder quick-setting agent still has a large development space in comparison with the powder quick-setting agent as long as the problems of high content of the powdery quick-setting alkali and cost are solved. Along with the expansion of the scale of domestic infrastructure, the continuous increase of railway tunnels, highway tunnels, water conservancy tunnels, mine roadways, subways, sewage discharge tunnels, electric power tunnels and the like, the requirement of sprayed concrete for underground engineering is sharply increased, and the requirement of the accelerator is greatly increased.

The environment is seriously damaged by the massive stacking of coal gangue and red mud, the environment is polluted by acidic substances generated by the massive stacking of coal gangue and the environment is polluted by alkaline substances generated by the massive stacking of red mud. The method solves the problem, and the application of the red mud and the coal gangue in the production of a large number of building materials is a good development direction. The cement accelerator needs a large amount of raw materials for production, and if the coal gangue and the red mud can be used for production of the cement accelerator, the cement accelerator is one of effective ways for realizing large utilization of the red mud and the coal gangue.

Disclosure of Invention

The invention aims at the problems of high alkalinity, high production cost, serious environmental pollution, waste of mineral resources and the like of the conventional powder accelerator, uses the red mud and the coal gangue for preparing the accelerator, and simultaneously solves the problems of environmental pollution caused by acidic substances generated by the mass accumulation of the coal gangue and environmental pollution caused by alkaline substances generated by the mass accumulation of the red mud, thereby providing a preparation method of the red mud coal gangue-based accelerator.

In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of the red mud coal gangue accelerator comprises the following steps:

first, mixing the materials

30-35% by weight: 35% -40%: weighing 25-35% of coal gangue, Bayer process red mud and sintering process red mud, mixing the materials in a mixer for 30min, and wrapping and storing the materials with a plastic film for 2-3 weeks to obtain a mixture;

second step, drying in the sun

Putting the mixture prepared in the first step into a constant-temperature drying box, setting the temperature to be 90 ℃, and drying for 6-8 hours to obtain a dry material;

third step, crushing

Crushing the dry material prepared in the second step to obtain a crushed material;

fourthly, activating the dry materials

Firing the crushed material obtained in the third step to 850 ℃, and performing activation treatment on the crushed material to obtain an active material;

step five, ball milling

Placing the activated dry material obtained in the fourth step into a dry ball mill for ball milling for 1-2 hours to obtain a master batch;

sixth step, master batch sieving

Sieving the master batch obtained in the fifth step by using a 150-mesh sieve to remove particles with the particle size of more than or equal to 106 microns to obtain powder;

seventh step, balling

Putting the powder obtained in the sixth step into a balling disc to prepare a ball material;

eighth step, baking

Putting the ball material prepared in the seventh step into an oven for drying, then putting the ball material into a sagger for burning by an electric kiln, wherein the burning curve is that the temperature is increased from room temperature to 300 ℃, and the time is 1 hour; heating from 300 deg.C to 900 deg.C for 2 h; heating from 900 ℃ to 1050 ℃ for 1h, heating from 1050 ℃ to 1250 ℃ for 2h, preserving the heat at 1250 ℃ for 0.5h, and naturally cooling to room temperature after the heat preservation is finished to obtain a semi-finished product;

ninth step, grinding

Putting the semi-finished product obtained in the eighth step into a dry ball mill for grinding to obtain clinker;

the tenth step, sieving and sealing

And (4) sieving the clinker ground in the ninth step by a 150-mesh sieve, and filling the clinker into a sealing bag for sealing to obtain the red mud coal gangue-based accelerator powder.

Compared with the prior art, the invention has the following advantages:

in order to solve the problems of high production cost and waste of mineral resources, the invention adopts the red mud and the coal gangue as raw materials to produce and prepare the accelerator, and the mixing amount of the red mud and the coal gangue is 95-100%, thereby greatly reducing the cost.

The invention hardly adds other additives except the red mud and the coal gangue, maximizes the solid waste resource, provides a new way for solving the discharge of the red mud and the coal gangue, and makes a contribution to protecting the ecological environment.

The red mud and gangue accelerator prepared by the invention is a novel mineral alkali-free accelerator, the red mud and the gangue interact with each other to generate acid-base reaction, and the acidity of the gangue and the alkalinity of the red mud are eliminated through two steps of material mixing and activation.

Detailed Description

Example 1

The preparation method of the red mud coal gangue accelerator comprises the following steps:

first, mixing the materials

Weighing 30% of coal gangue, Bayer process red mud and sintering process red mud: 35%: 35 percent of the mixture is put into a dough kneader for mixing, the mixture is mixed for 30min, and the mixture is wrapped by a plastic film and stored for 2 weeks to prepare a mixture;

second step, drying in the sun

Putting the mixture obtained in the first step into a constant-temperature drying box, setting the temperature to be 90 ℃, and drying for 6 hours to obtain a dry material;

third step, crushing

Crushing the dry material obtained in the second step to obtain a crushed material;

fourthly, activating the dry materials

Firing the crushed material obtained in the third step to 850 ℃, and performing activation treatment on the crushed material to obtain an active material;

step five, ball milling

Placing the activated dry material obtained in the fourth step into a dry ball mill for ball milling for 2 hours to obtain a master batch;

sixth step, master batch sieving

Sieving the master batch obtained in the fifth step by using a 150-mesh sieve to remove particles with the particle size of more than or equal to 106 mu m to obtain powder;

seventh step, balling

Preparing ball materials from the obtained powder in a ball forming disc;

eighth step, baking

Putting the ball material prepared in the seventh step into an oven for drying, then putting the ball material into a sagger for burning by an electric kiln, wherein the burning curve is that the temperature is increased from room temperature to 300 ℃, and the time is 1 hour; heating from 300 deg.C to 900 deg.C for 2 h; heating from 900 ℃ to 1050 ℃ for 1h, heating from 1050 ℃ to 1250 ℃ for 2h, preserving the heat at 1250 ℃ for 0.5h, and naturally cooling to room temperature after the heat preservation is finished to obtain a semi-finished product;

ninth step, grinding

Putting the semi-finished product obtained in the eighth step into a dry ball mill for grinding to obtain clinker;

the tenth step, sieving and sealing

And (4) sieving the clinker ground in the ninth step by a 150-mesh sieve, and filling the clinker into a sealing bag for sealing to obtain the red mud coal gangue-based accelerator powder.

Example 2

The preparation method of the red mud coal gangue accelerator comprises the following steps:

first, mixing the materials

According to the weight ratio of 35%: 40%: weighing 25% of coal gangue, Bayer process red mud and sintering process red mud, mixing in a mixer for 30min, wrapping with plastic film, and storing for 3 weeks to obtain mixture;

second step, drying in the sun

Putting the mixture prepared in the first step into a constant-temperature drying box, setting the temperature to be 90 ℃, and drying for 8 hours to obtain a dry material;

third step, crushing

Crushing the dry material prepared in the second step to obtain a crushed material;

fourthly, activating the dry materials

Firing the crushed material obtained in the third step to 850 ℃, and performing activation treatment on the crushed material to obtain an active material;

step five, ball milling

Placing the activated dry material obtained in the fourth step into a dry ball mill for ball milling for 1h to obtain a master batch;

sixth step, master batch sieving

Sieving the master batch obtained in the fifth step by using a 150-mesh sieve to remove particles with the particle size of more than or equal to 106 microns to obtain powder;

seventh step, balling

Putting the powder obtained in the sixth step into a balling disc to prepare a ball material;

eighth step, baking

Putting the ball material prepared in the seventh step into an oven for drying, then putting the ball material into a sagger for burning by an electric kiln, wherein the burning curve is that the temperature is increased from room temperature to 300 ℃, and the time is 1 hour; heating from 300 deg.C to 900 deg.C for 2 h; heating from 900 ℃ to 1050 ℃ for 1h, heating from 1050 ℃ to 1250 ℃ for 2h, preserving the heat at 1250 ℃ for 0.5h, and naturally cooling to room temperature after the heat preservation is finished to obtain a semi-finished product;

ninth step, grinding

Putting the semi-finished product obtained in the eighth step into a dry ball mill for grinding to obtain clinker;

the tenth step, sieving and sealing

And (4) sieving the clinker ground in the ninth step by a 150-mesh sieve, and filling the clinker into a sealing bag for sealing to obtain the red mud coal gangue-based accelerator powder.

Example 3

The preparation method of the red mud coal gangue accelerator comprises the following steps:

first, mixing the materials

According to the weight ratio of 31%: 38%: weighing coal gangue, Bayer process red mud and sintering process red mud at a ratio of 31%, mixing in a mixer for 30min, wrapping with plastic film, and storing for 3 weeks to obtain mixture;

second step, drying in the sun

Putting the mixture prepared in the first step into a constant-temperature drying box, setting the temperature to be 90 ℃, and drying for 7 hours to obtain a dry material;

third step, crushing

Crushing the dry material prepared in the second step to obtain a crushed material;

fourthly, activating the dry materials

Firing the crushed material obtained in the third step to 850 ℃, and performing activation treatment on the crushed material to obtain an active material;

step five, ball milling

Placing the activated dry material obtained in the fourth step into a dry ball mill for ball milling for 1.5h to obtain a master batch;

sixth step, master batch sieving

Sieving the master batch obtained in the fifth step by using a 150-mesh sieve to remove particles with the particle size of more than or equal to 106 microns to obtain powder;

seventh step, balling

Putting the powder obtained in the sixth step into a balling disc to prepare a ball material;

eighth step, baking

Putting the ball material prepared in the seventh step into an oven for drying, then putting the ball material into a sagger for burning by an electric kiln, wherein the burning curve is that the temperature is increased from room temperature to 300 ℃, and the time is 1 hour; heating from 300 deg.C to 900 deg.C for 2 h; heating from 900 ℃ to 1050 ℃ for 1h, heating from 1050 ℃ to 1250 ℃ for 2h, preserving the heat at 1250 ℃ for 0.5h, and naturally cooling to room temperature after the heat preservation is finished to obtain a semi-finished product;

ninth step, grinding

Putting the semi-finished product obtained in the eighth step into a dry ball mill for grinding to obtain clinker;

the tenth step, sieving and sealing

And (4) sieving the clinker ground in the ninth step by a 150-mesh sieve, and filling the clinker into a sealing bag for sealing to obtain the red mud coal gangue-based accelerator powder.