阅读说明：本技术 一种利用稻壳灰制备补强高分散性白炭黑的方法 (Method for preparing reinforced high-dispersibility white carbon black by using rice hull ash ) 是由 谢宇 李佳芯 凌云 宣全 张猛 于 2020-04-07 设计创作，主要内容包括：本发明公开了一种利用稻壳灰制备补强高分散性白炭黑的方法,其包括以下步骤：步骤一、原材料预处理；步骤二、制备硫酸溶液；步骤三、制备水玻璃溶液；步骤四、合成反应；步骤五、压滤清洗；步骤六、干燥；步骤七、白炭黑有机包覆。本发明用稻壳灰开发多功能新型混凝土超疏水性添加剂高分散性的白炭黑,采用了高压气流粉碎喷雾有机包覆集成等关键技术,提升了传统白炭黑产业水平,解决了墙体材料本身的抗渗性能差的问题。(The invention discloses a method for preparing reinforced high-dispersity white carbon black by using rice hull ash, which comprises the following steps of: step one, raw material pretreatment; step two, preparing a sulfuric acid solution; step three, preparing a water glass solution; step four, synthetic reaction; step five, filter pressing and cleaning; step six, drying; and step seven, organically coating the white carbon black. The invention develops the multifunctional novel high-dispersity white carbon black of the concrete super-hydrophobic additive by using the rice hull ash, adopts key technologies such as high-pressure airflow crushing, spraying, organic coating integration and the like, improves the industrial level of the traditional white carbon black, and solves the problem of poor impermeability of a wall material.)

1. A method for preparing reinforced high-dispersibility white carbon black by using rice hull ash is characterized by comprising the following steps: which comprises the following steps:

step one, raw material pretreatment:

removing impurities from the rice hull ash, crushing, adding water, soaking, drying, and roasting the rice hull ash for the second time to obtain pretreated rice hull ash;

step two, preparing a sulfuric acid solution;

step three, preparing a water glass solution:

selecting a sodium silicate solution to prepare a sodium silicate solution with the concentration of 20%, conveying the sodium silicate solution to a transfer tank for steam removal, introducing the removed hot steam into a water tank through a pipeline, heating cold water in the water tank, and curing to obtain a water glass solution;

step four, synthesis reaction:

adding the pretreated rice hull ash, 10% dilute sulfuric acid solution and water glass solution into a reaction kettle, adding water into the reaction kettle, and directly introducing steam to raise the temperature under stirring to obtain white carbon black slurry;

step five, filter pressing and cleaning:

carrying out filter pressing treatment on the white carbon black slurry, conveying a filter cake to a dynamic washing tank, washing to obtain white carbon black slurry, and carrying out filter pressing treatment;

step six, drying:

drying the white carbon black slurry after pressure filtration and washing;

step seven, organic coating of white carbon black:

and uniformly coating a layer of organic auxiliary agent on the surface of the white carbon black by adopting a high-pressure airflow crushing and spraying organic coating process technology to finally obtain the reinforcing high-dispersity white carbon black product.

2. The method for preparing the reinforcing high-dispersity white carbon black by using the rice hull ash as claimed in claim 1, is characterized in that: which comprises the following steps:

step one, raw material pretreatment:

removing impurities from the rice hull ash, crushing the rice hull ash to 100 meshes, adding water with the mass of 8-10 times of that of the rice hull ash, soaking, drying, and roasting for the second time to obtain pretreated rice hull ash;

step two, preparing a sulfuric acid solution:

preparing a 10% dilute sulfuric acid solution;

step three, preparing a water glass solution:

selecting a sodium silicate solution to prepare a sodium silicate solution with the concentration of 20%, conveying the sodium silicate solution to a transfer tank for steam removal, introducing the removed hot steam into a water tank through a pipeline, heating cold water in the water tank, and curing to obtain a water glass solution;

step four, synthesis reaction:

adding the pretreated rice hull ash, a 10% concentration dilute sulfuric acid solution and a water glass solution into a reaction kettle, adding water which is 0.6-1.2 times of the mass of the rice hull ash into the reaction kettle, directly introducing steam for heating while stirring, adjusting the pH value to 4.0-4.5 after the metered water glass is added, and stirring and heating to obtain white carbon black slurry;

step five, filter pressing and cleaning:

pumping the white carbon black slurry into a membrane filter press for filter pressing treatment, conveying a filter cake to a dynamic washing tank, washing to obtain white carbon black slurry, and pumping the white carbon black slurry into the membrane filter press for filter pressing treatment;

step six, drying:

drying the white carbon black slurry after pressure filtration and washing by a rotary flash evaporation dryer;

step seven, organic coating of white carbon black:

and (3) adopting a high-pressure airflow crushing and spraying organic coating process technology to control the white carbon black to be crushed to 1500 meshes, and uniformly coating a layer of organic auxiliary agent on the surface of the white carbon black to finally obtain the reinforced high-dispersibility white carbon black product.

3. The method for preparing the reinforcing high-dispersity white carbon black by using the rice hull ash as claimed in claim 1, is characterized in that: which comprises the following steps:

step one, raw material pretreatment:

removing impurities from the rice hull ash, crushing the rice hull ash to 100 meshes, adding 8-10 times of mass water, soaking the rice hull ash at 35-50 ℃ for 2h, drying the rice hull ash at 400-500 ℃, and roasting the rice hull ash for the second time to obtain pretreated rice hull ash;

step two, preparing a sulfuric acid solution:

preparing a 10% dilute sulfuric acid solution by using industrial sulfuric acid;

step three, preparing a water glass solution:

selecting a sodium silicate solution to prepare a sodium silicate solution with a concentration of 20%, conveying the sodium silicate solution to a transfer tank for steam removal, introducing the removed hot steam into a water tank through a pipeline, heating cold water in the water tank, and curing to obtain a water glass solution;

step four, synthesis reaction:

adding pretreated rice hull ash, 10% concentration dilute sulfuric acid solution and water glass solution into a reaction kettle, adding water with the mass of 0.6-1.2 times of that of the rice hull ash into the reaction kettle, directly introducing steam to raise the temperature to 84-92 ℃ under stirring, controlling the flow of sulfuric acid and the flow of water glass, adjusting the pH value to 4.0-4.5 after the metered water glass is added, stirring and heating to 240 ℃ with 200 organic acids, and obtaining white carbon black slurry after 3-5 hours;

step five, filter pressing and cleaning:

pumping the white carbon black slurry into a membrane filter press by a pump for filter pressing treatment, conveying a filter cake to a dynamic washing tank, washing to obtain white carbon black slurry, and pumping the white carbon black slurry into the membrane filter press by the pump for filter pressing treatment;

step six, drying:

drying the white carbon black slurry after pressure filtration and washing by a rotary flash evaporation dryer;

step seven, organic coating of white carbon black:

and (3) adopting a high-pressure airflow crushing and spraying organic coating process technology to control the white carbon black to be crushed to 1500 meshes, and uniformly coating a layer of organic auxiliary agent on the surface of the white carbon black to finally obtain the reinforced high-dispersibility white carbon black product.

4. The method for preparing the reinforcing high-dispersity white carbon black by using the rice hull ash as claimed in claim 1, is characterized in that: in the first step, the temperature for secondary roasting of the rice husk ash is 500-550 ℃.

5. The method for preparing the reinforcing high-dispersity white carbon black by using the rice hull ash as claimed in claim 1, is characterized in that: the temperature of the curing in the third step is 100-120 ℃.

6. The method for preparing the reinforcing high-dispersity white carbon black by using the rice hull ash as claimed in claim 1, is characterized in that: the curing time in the third step is 40-60 min.

7. The method for preparing the reinforcing high-dispersity white carbon black by using the rice hull ash as claimed in claim 1, is characterized in that: the flow rate of the sulfuric acid in the fourth step is 200-320m³The flow rate of the water glass is 250-280m³/h。

8. The method for preparing the reinforcing high-dispersity white carbon black by using the rice hull ash as claimed in claim 1, is characterized in that: the drying time in the sixth step is 100-150 min.

9. The method for preparing the reinforcing high-dispersity white carbon black by using the rice hull ash as claimed in claim 1, is characterized in that: the inlet temperature of the hot air in the sixth step is 400-450 ℃.

10. The method for preparing the reinforcing high-dispersity white carbon black by using the rice hull ash as claimed in claim 1, is characterized in that: the outlet temperature of the tail gas in the sixth step is 160-200 ℃.

Technical Field

The invention relates to a method for preparing reinforced high-dispersibility white carbon black by using rice hull ash, belonging to the technical field of white carbon black preparation.

Background

The problem of leakage of concrete materials has been a difficult complication that plagues construction engineering. The waterproof materials used to solve the problem of leakage at present are mainly of two types: first, "cure the symptoms" outer waterproof technology, lay waterproof material or scribble water proof coating outside building material, make it form waterproof isolation layer, and then seal the surface of concrete, the prevention and cure water passes through, but the shortcoming is, waterproofing membrane's effective use period is short, and the cost is higher, and in case the waterproof layer is damaged, became invalid, and the seepage position is difficult to judge, restores the difficulty. The other is the 'permanent' internal waterproof technology, which takes cement, gravel as basic raw materials, adds water reducing agent, expanding agent or inorganic waterproof material, etc., improves the pore structure of the raw materials by adjusting the mixing proportion of the raw materials, increases the compactness among interfaces of various raw materials, and leads capillary water to be difficult to pass through, thereby achieving the aim of waterproofing. But has disadvantages of poor deformation resistance, easy generation of cracks, etc.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for preparing reinforced high-dispersibility white carbon black by using rice hull ash, developing multifunctional novel high-dispersibility white carbon black of a concrete super-hydrophobicity additive by using the rice hull ash, adopting key technologies such as high-pressure airflow crushing, spraying, organic coating integration and the like, coating an organic auxiliary agent on the surface of the white carbon black for surface modification, changing and improving various performances of the white carbon black, wherein the coated and modified white carbon black has a brand-new super-hydrophobicity function.

The invention is realized by the following scheme: a method for preparing reinforced high-dispersity white carbon black by using rice hull ash comprises the following steps:

step one, raw material pretreatment:

removing impurities from the rice hull ash, crushing, adding water, soaking, drying, and roasting the rice hull ash for the second time to obtain pretreated rice hull ash;

step two, preparing a sulfuric acid solution;

step three, preparing a water glass solution:

selecting a sodium silicate solution to prepare a sodium silicate solution with the concentration of 20%, conveying the sodium silicate solution to a transfer tank for steam removal, introducing the removed hot steam into a water tank through a pipeline, heating cold water in the water tank, and curing to obtain a water glass solution;

step four, synthesis reaction:

adding the pretreated rice hull ash, 10% dilute sulfuric acid solution and water glass solution into a reaction kettle, adding water into the reaction kettle, and directly introducing steam to raise the temperature under stirring to obtain white carbon black slurry;

step five, filter pressing and cleaning:

carrying out filter pressing treatment on the white carbon black slurry, conveying a filter cake to a dynamic washing tank, washing to obtain white carbon black slurry, and carrying out filter pressing treatment;

step six, drying:

drying the white carbon black slurry after pressure filtration and washing;

step seven, organic coating of white carbon black:

and uniformly coating a layer of organic auxiliary agent on the surface of the white carbon black by adopting a high-pressure airflow crushing and spraying organic coating process technology to finally obtain the reinforcing high-dispersity white carbon black product.

A method for preparing reinforced high-dispersity white carbon black by using rice hull ash comprises the following steps:

step one, raw material pretreatment:

removing impurities from the rice hull ash, crushing the rice hull ash to 100 meshes, adding water with the mass of 8-10 times of that of the rice hull ash, soaking, drying, and roasting for the second time to obtain pretreated rice hull ash;

step two, preparing a sulfuric acid solution:

preparing a 10% dilute sulfuric acid solution;

step three, preparing a water glass solution:

selecting a sodium silicate solution to prepare a sodium silicate solution with the concentration of 20%, conveying the sodium silicate solution to a transfer tank for steam removal, introducing the removed hot steam into a water tank through a pipeline, heating cold water in the water tank, and curing to obtain a water glass solution;

step four, synthesis reaction:

adding the pretreated rice hull ash, a 10% concentration dilute sulfuric acid solution and a water glass solution into a reaction kettle, adding water which is 0.6-1.2 times of the mass of the rice hull ash into the reaction kettle, directly introducing steam for heating while stirring, adjusting the pH value to 4.0-4.5 after the metered water glass is added, and stirring and heating to obtain white carbon black slurry;

step five, filter pressing and cleaning:

pumping the white carbon black slurry into a membrane filter press for filter pressing treatment, conveying a filter cake to a dynamic washing tank, washing to obtain white carbon black slurry, and pumping the white carbon black slurry into the membrane filter press for filter pressing treatment;

step six, drying:

drying the white carbon black slurry after pressure filtration and washing by a rotary flash evaporation dryer;

step seven, organic coating of white carbon black:

and (3) adopting a high-pressure airflow crushing and spraying organic coating process technology to control the white carbon black to be crushed to 1500 meshes, and uniformly coating a layer of organic auxiliary agent on the surface of the white carbon black to finally obtain the reinforced high-dispersibility white carbon black product.

A method for preparing reinforced high-dispersity white carbon black by using rice hull ash comprises the following steps:

step one, raw material pretreatment:

removing impurities from the rice hull ash, crushing the rice hull ash to 100 meshes, adding 8-10 times of mass water, soaking the rice hull ash at 35-50 ℃ for 2h, drying the rice hull ash at 400-500 ℃, and roasting the rice hull ash for the second time to obtain pretreated rice hull ash;

step two, preparing a sulfuric acid solution:

preparing a 10% dilute sulfuric acid solution by using industrial sulfuric acid;

step three, preparing a water glass solution:

selecting a sodium silicate solution to prepare a sodium silicate solution with a concentration of 20%, conveying the sodium silicate solution to a transfer tank for steam removal, introducing the removed hot steam into a water tank through a pipeline, heating cold water in the water tank, and curing to obtain a water glass solution;

step four, synthesis reaction:

adding pretreated rice hull ash, 10% concentration dilute sulfuric acid solution and water glass solution into a reaction kettle, adding water with the mass of 0.6-1.2 times of that of the rice hull ash into the reaction kettle, directly introducing steam to raise the temperature to 84-92 ℃ under stirring, controlling the flow of sulfuric acid and the flow of water glass, adjusting the pH value to 4.0-4.5 after the metered water glass is added, stirring and heating to 240 ℃ with 200 organic acids, and obtaining white carbon black slurry after 3-5 hours;

step five, filter pressing and cleaning:

pumping the white carbon black slurry into a membrane filter press by a pump for filter pressing treatment, conveying a filter cake to a dynamic washing tank, washing to obtain white carbon black slurry, and pumping the white carbon black slurry into the membrane filter press by the pump for filter pressing treatment;

step six, drying:

drying the white carbon black slurry after pressure filtration and washing by a rotary flash evaporation dryer;

step seven, organic coating of white carbon black:

and (3) adopting a high-pressure airflow crushing and spraying organic coating process technology to control the white carbon black to be crushed to 1500 meshes, and uniformly coating a layer of organic auxiliary agent on the surface of the white carbon black to finally obtain the reinforced high-dispersibility white carbon black product.

In the first step, the temperature for secondary roasting of the rice husk ash is 500-550 ℃.

The temperature of the curing in the third step is 100-120 ℃.

The curing time in the third step is 40-60 min.

The flow rate of the sulfuric acid in the fourth step is 200-320m³The flow rate of the water glass is 250-280m³/h。

The drying time in the sixth step is 100-150 min.

The inlet temperature of the hot air in the sixth step is 400-450 ℃.

The outlet temperature of the tail gas in the sixth step is 160-200 ℃.

The invention has the beneficial effects that:

1. according to the method for preparing the reinforced high-dispersibility white carbon black by using the rice hull ash, the key technologies such as high-pressure airflow crushing, spraying, organic coating integration and the like are adopted, the surface of the white carbon black is coated with the organic auxiliary agent for surface modification, so that various performances of the white carbon black are changed and improved, and the coated and modified white carbon black has a brand-new super-hydrophobic function;

2. the invention relates to a method for preparing reinforced high-dispersity white carbon black by utilizing rice hull ash, which adopts a two-step high parallel flow technology, selects a proper amount of water glass (sodium silicate) to prepare a water glass solution with the concentration of 20%, prepares the water glass solution with the concentration of 10% by using industrial sulfuric acid, and performs neutralization reaction under specific conditions. The stability, controllability and product quality of product production are ensured, the process flow is shortened, and the investment is saved;

3. the method for preparing the reinforced high-dispersity white carbon black by using the rice hull ash improves the yield and the purity of the product by carrying out secondary roasting on the rice hull ash, so that the silicon content reaches over 95 percent, and the contents of heavy metals such as copper, iron and manganese are reduced.

Drawings

FIG. 1 is a schematic flow structure diagram of a method for preparing reinforced highly dispersible white carbon black from rice hull ash according to the present invention.

Detailed Description

The present invention is further illustrated below, but the scope of the invention is not limited to the disclosure.

In the following description, for purposes of clarity, not all features of an actual implementation are described, well-known functions or constructions are not described in detail since they would obscure the invention with unnecessary detail, it being understood that in the development of any actual embodiment, numerous implementation details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, changing from one implementation to another, and it being recognized that such development effort might be complex and time consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.