阅读说明：本技术 一种硅酸钠连续生产工艺及装置 (Sodium silicate continuous production process and device ) 是由 李霆云 李灵波 李翔 姜薇 候杰君 雷昌学 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种硅酸钠连续生产工艺及装置。一种硅酸钠连续生产工艺,包括如下步骤：a)连续向反应单元输送氢氧化钠、石英砂；b)将反应单元中的反应产物连续出料；c)将反应产物连续过滤,得到纯净的水玻璃；d)根据需要的模数向纯净的水玻璃内加入氢氧化钠；e)经过喷雾干燥得到干燥的硅酸钠颗粒。一种硅酸钠连续生产装置配合连续生产工艺设置,主要包括原料储罐、原料输送装置、反应单元、反应单元出料装置、连续过滤单元、调配池进料装置、调配池氢氧化钠进料装置、调配池、喷雾干燥单元进料装置、喷雾干燥单元。本发明给出了一种全新的硅酸钠生产工艺,提升硅酸钠生产效率、生产弹性、工艺稳定性、缩短反馈间隔。(The invention discloses a sodium silicate continuous production process and a sodium silicate continuous production device. A continuous production process of sodium silicate comprises the following steps: a) continuously conveying sodium hydroxide and quartz sand to the reaction unit; b) continuously discharging reaction products in the reaction unit; c) continuously filtering the reaction product to obtain pure water glass; d) adding sodium hydroxide into the purified water glass according to the required modulus; e) spray drying to obtain dried sodium silicate granules. The utility model provides a sodium silicate continuous production device cooperation continuous production process sets up, mainly includes raw materials storage tank, raw materials conveyor, reaction unit discharging device, continuous filtration unit, blending pool feed arrangement, blending pool sodium hydroxide feed arrangement, blending pool, spray drying unit feed arrangement, spray drying unit. The invention provides a brand-new sodium silicate production process, which improves the production efficiency, production elasticity and process stability of sodium silicate and shortens the feedback interval.)

1. A continuous production process of sodium silicate is characterized in that: the method comprises the following steps:

a) continuously conveying sodium hydroxide and quartz sand to the reaction unit;

b) continuously discharging reaction products in the reaction unit;

c) continuously filtering the reaction product to obtain pure water glass;

d) adding sodium hydroxide into the purified water glass according to the required modulus;

e) spray drying to obtain dried sodium silicate granules.

2. A sodium silicate continuous production apparatus for carrying out the sodium silicate continuous production process of claim 1, characterized in that: the system is provided with a quartz sand storage tank (1), a quartz sand conveying device (2), a sodium hydroxide storage tank (3), a reaction unit sodium hydroxide conveying device (4), a reaction unit discharging device (9), a continuous filtering unit, a blending pool feeding device (14), a blending pool sodium hydroxide feeding device (15), a blending pool (16), a spray drying unit feeding device (17) and a spray drying unit (18);

an outlet pipeline at the bottom of the quartz sand storage tank (1) is connected to an inlet of the quartz sand conveying device (2), the quartz sand storage tank (1) is also provided with a weighing device, and then the pipeline is connected to the reaction unit;

an outlet pipeline at the bottom of the sodium hydroxide storage tank (3) is connected to an inlet of the reaction unit sodium hydroxide conveying device (4), an outlet of the reaction unit sodium hydroxide conveying device (4) is provided with a check valve, a mass flow meter and an adjusting valve, and then the pipeline is connected to the reaction unit;

the reaction unit is also provided with a steam inlet pipeline, the steam inlet pipeline is provided with a regulating valve, a pressure gauge is further arranged in the reaction unit, an outlet pipeline of the reaction unit is connected to an inlet of a reaction unit discharging device (9), an outlet of the reaction unit discharging device (9) is connected to an inlet of a continuous filtering unit, a water glass outlet of the continuous filtering unit is connected to an inlet of a blending pool feeding device (14), an outlet of the blending pool feeding device (14) is connected to a blending pool (16), an outlet of the blending pool is connected to an inlet of a spray drying unit feeding device (17), and an outlet of the spray drying unit feeding device (17) is connected to a spray drying unit (18);

an outlet pipeline at the bottom of the sodium hydroxide storage tank (3) is divided into a pipeline to be connected to an inlet of a sodium hydroxide feeding device (15) of a blending pool before entering an inlet of a sodium hydroxide conveying device (4) of the reaction unit, and then the pipeline is led to the blending pool (16).

3. The sodium silicate continuous production apparatus of claim 2, wherein: the quartz sand conveying device (2) is an auger with a variable frequency motor.

4. The sodium silicate continuous production apparatus of claim 2, wherein: the reaction unit comprises a pre-reactor (5), a reactor feeding pump (6) and a reactor (7);

the outlet of the quartz sand conveying device (2) is connected to the top of the pre-reactor (5), the outlet of the reaction unit sodium hydroxide conveying device (4) is connected to the bottom of the pre-reactor (5), the bottom of the pre-reactor (5) is also provided with a high-pressure steam inlet pipeline with an adjusting valve, the discharge pipeline of the pre-reactor (5) is connected to the inlet of the reactor feed pump (6), the outlet of the reactor feed pump (6) is provided with a check valve, an adjusting valve and a mass flow meter, the outlet pipeline of the reactor feed pump (6) is finally connected to the inlet of the reactor (7), the bottom of the reactor (7) is also provided with a high-pressure steam inlet pipeline with an adjusting valve, the discharge pipeline of the reactor (7) is divided into two paths, one path is connected to the inlet of the reaction unit discharging device (9), the other path is used as a circulating material flow pipeline and is connected to the pre-reactor (5), and, And adjusting the valve.

5. The sodium silicate continuous production apparatus of claim 2, wherein: the continuous filtering unit comprises a rotary drum vacuum filter (10), a gas-liquid separating tank and a vacuum pump (11);

the outlet of the reaction unit discharging device (9) is connected to the feed inlet of the rotary drum vacuum filter (10), the bottom of the rotary drum vacuum filter (10) is divided into two parts, one part is used for storing solid particles scraped by a scraper of the rotary drum vacuum filter (10), the other part is provided with a nitrogen backflushing pipeline, the bottom of the rotary drum vacuum filter (10) is also provided with a water glass outlet of a first continuous filtering unit, the outlet of the continuous filtering unit is provided with filter cloth, the water glass outlet of the continuous filtering unit is connected to the inlet of the allocating pool feeding device (14), an axial extending pipeline inside a rotary drum of the rotary drum vacuum filter (10) is connected with the inlet of a gas-liquid separating tank, the gas phase outlet of the gas-liquid separating tank is connected with a vacuum pump (11) for manufacturing vacuum degree, the liquid phase outlet of the gas-liquid separating tank is used as the water glass, is connected to the inlet of a blending tank feeding device (14).

6. The sodium silicate continuous production apparatus of claim 4, wherein: still be equipped with unloading jar (8) between reactor (7) and the import of reaction unit discharging device (9), the tank deck of unloading jar (8) is equipped with the manometer, and the tank deck of unloading jar (8) still links has the unloading pipeline, still is equipped with the governing valve on the unloading pipeline.

7. The sodium silicate continuous production apparatus of claim 5, wherein: a buffer tank (12) and a secondary filter tank (13) are further arranged between the outlet of the continuous filtering unit and the blending tank feeding device (14), the outlet of the continuous filtering unit is connected to the top of the buffer tank (12), an outlet pipeline at the bottom of the buffer tank (12) extends into the bottom of the secondary filter tank (13), and an inlet pipeline of the blending tank feeding device (14) extends into the secondary filter tank (13).

Technical Field

The invention belongs to the technical field of silicification industry, and particularly relates to a continuous production process and a continuous production device for sodium silicate.

Background

At present, the processes for producing sodium silicate are all intermittent production processes, wherein a certain amount of sodium hydroxide and quartz sand are required to be added into a reaction kettle in one production batch of the intermittent production processes, the reaction kettle is closed, then high-pressure steam is introduced into the reaction kettle, after long-time reaction, water glass in the reaction kettle is discharged to a filter tank, then the water glass is subjected to suction filtration through a plate frame, and then is added into a blending tank, and further spray drying is carried out to obtain the finished product of sodium silicate. The production efficiency, production elasticity and process operation stability of the intermittent production process are not high enough, in addition, when indexes such as sodium silicate modulus are unqualified, detection can be carried out and adjustment can be carried out in subsequent batches only after the reaction of raw materials of a certain batch is finished, and the feedback interval is long.

Disclosure of Invention

In order to solve the problems in the prior art and achieve the aims of '1 improving the production efficiency, production elasticity and process stability of sodium silicate and 2 shortening the adjustment feedback interval', the invention provides a continuous production process device and a continuous production process of sodium silicate.

A continuous production process of sodium silicate comprises the following steps:

a) continuously conveying sodium hydroxide and quartz sand to the reaction unit;

b) continuously discharging reaction products in the reaction unit;

c) continuously filtering the reaction product to obtain pure water glass;

d) adding sodium hydroxide into the purified water glass according to the required modulus;

e) spray drying to obtain dried sodium silicate granules.

A sodium silicate continuous production device is provided with a quartz sand storage tank, a quartz sand conveying device, a sodium hydroxide storage tank, a reaction unit sodium hydroxide conveying device, a reaction unit discharging device, a continuous filtering unit, a blending tank feeding device, a blending tank sodium hydroxide feeding device, a blending tank, a spray drying unit feeding device and a spray drying unit;

an outlet pipeline at the bottom of the quartz sand storage tank is connected to an inlet of the quartz sand conveying device, the quartz sand storage tank is also provided with a weighing device, and then the pipeline is connected to the reaction unit;

an outlet pipeline at the bottom of the sodium hydroxide storage tank is connected to an inlet of the sodium hydroxide conveying device of the reaction unit, an outlet of the sodium hydroxide conveying device of the reaction unit is provided with a check valve, a mass flow meter and an adjusting valve, and then the pipeline is connected to the reaction unit;

the reaction unit is also provided with a steam inlet pipeline, the steam inlet pipeline is provided with a regulating valve, a pressure gauge is further arranged in the reaction unit, an outlet pipeline of the reaction unit is connected to an inlet of a reaction unit discharging device, an outlet of the reaction unit discharging device is connected to an inlet of the continuous filtering unit, an outlet of the continuous filtering unit is connected to an inlet of a blending pool feeding device, an outlet of the blending pool feeding device is connected to a blending pool, an outlet of the blending pool is connected to an inlet of a spray drying unit feeding device, and an outlet of the spray drying unit feeding device is connected to the spray drying unit;

an outlet pipeline at the bottom of the sodium hydroxide storage tank is divided into a pipeline connected to an inlet of a sodium hydroxide feeding device of the blending tank before entering an inlet of a sodium hydroxide conveying device of the reaction unit, and then the pipeline is led to the blending tank.

Furthermore, the quartz sand conveying device is an auger provided with a variable frequency motor.

Further, the reaction unit comprises a pre-reactor, a reactor feeding pump and a reactor;

quartz sand conveyor's export is even at the top of prereactor, reaction unit sodium hydroxide conveyor's export is even at the bottom of prereactor, prereactor bottom still is equipped with the high-pressure steam inlet pipeline of taking the governing valve, the ejection of compact pipeline of prereactor links at the import of reactor charge pump, the export of reactor charge pump is equipped with the check valve, governing valve and mass flowmeter, reactor charge pump outlet pipeline finally links into the reactor import, the reactor bottom still is equipped with the high-pressure steam inlet pipeline of taking the governing valve, reactor discharge pipeline divide into two the tunnel, link to reaction unit discharging device's import all the way, regard as circulation commodity circulation pipeline all the way, link to the prereactor, be equipped with mass flowmeter on the circulation commodity circulation pipeline, the governing valve.

Further, the continuous filtering unit comprises a rotary drum vacuum filter, a gas-liquid separation tank and a vacuum pump;

the outlet of the reaction unit discharging device is connected to the feed inlet of the rotary drum vacuum filter, the bottom of the rotary drum vacuum filter is divided into two parts, one part is used for storing solid particles scraped by a scraper of the rotary drum vacuum filter, the other part is provided with a nitrogen backflushing pipeline, the water glass outlet of the first continuous filtering unit is also arranged, the outlet of the continuous filtering unit is provided with filter cloth, the water glass outlet of the continuous filtering unit is connected to the inlet of the mixing tank feeding device, the axial extending pipeline inside a rotary drum of the rotary drum vacuum filter is connected with the inlet of a gas-liquid separation tank, the gas phase outlet of the gas-liquid separation tank is connected with the gas pumping pipeline of the vacuum pump for manufacturing vacuum degree, and the liquid phase outlet of the gas-liquid separation tank is used as the water glass outlet of the second continuous filtering unit and is connected with the water glass outlet pipeline.

Further, still be equipped with the atmospheric tank between reactor and reaction unit discharging device's import, the tank deck of atmospheric tank is equipped with the manometer, and the tank deck of atmospheric tank still links has the pipeline of unloading, still is equipped with the governing valve on the pipeline of unloading.

Furthermore, a buffer tank and a secondary filter tank are arranged between the outlet of the continuous filter unit and the feeding device of the blending tank, the outlet of the continuous filter unit is connected to the tank top of the buffer tank, an outlet pipeline at the bottom of the buffer tank extends into the tank bottom of the secondary filter tank, and an inlet pipeline of the feeding device of the blending tank extends into the secondary filter tank.

The weighing device of quartz sand storage tank detects the change of weighing of quartz sand storage tank, reaction unit sodium hydroxide conveyor detects the sodium hydroxide mass flow of reaction unit sodium hydroxide conveyor export, because can preset expected sodium silicate modulus in the middle of the production, consequently, quartz sand that quartz sand storage tank outwards carried and sodium hydroxide storage tank outwards carried should accord with the quartz sand that expected sodium silicate modulus corresponds, sodium hydroxide mass flow rate, when the change of weighing of quartz sand storage tank and sodium hydroxide mass flow rate appear undulantly, carry out the control of mass flow rate through the governing valve of control frequency conversion screw feeder, reaction unit sodium hydroxide conveyor export respectively.

Feeding quartz sand and sodium hydroxide into a pre-reactor according to a mass flow rate ratio corresponding to an expected modulus, wherein the quartz sand passes through a dome valve from an outlet of an auger and then enters the pre-reactor, high-pressure steam is introduced into the bottom of the pre-reactor, and the dome valve is continuously opened and closed, so that the quartz sand and the sodium hydroxide are fed in proportion in unit time on one hand, and the pressure in the pre-reactor is prevented from suddenly dropping on the other hand, meanwhile, the pre-reactor is also provided with a pressure monitoring device, so that a regulating valve on a pipeline of the high-pressure steam entering the pre-reactor is controlled, the temperature and the pressure in the pre-reactor are maintained, the quartz sand and the sodium hydroxide are subjected to a reaction at a certain speed in the pre-reactor, a mixture of the quartz sand and the sodium hydroxide which are partially reacted is continuously fed into the reactor through a reactor feeding pump, and the pressure in the, the mixture of quartz sand and sodium hydroxide continues to react in the reactor, high-pressure steam is also introduced into the reactor, a regulating valve is arranged on a high-pressure steam pipeline, the reactor is provided with a pressure detection device to further control the regulating valve on the high-pressure steam pipeline, the material with complete reaction degree is discharged firstly in the reactor, the mixture material flow which just enters the reactor has an opportunity to be discharged after a period of reaction time, a reaction tower can be used as a reaction container, a discharge pipeline is divided into two paths, one path is returned to the pre-reactor through pressure difference in a circulating pipeline to promote the overall reaction progress of the material in the pre-reactor, in addition, the reaction time is prolonged in a phase-changing manner, the material quality in the pre-reactor is improved, the reaction degree of the material in the reactor is favorably improved, and the water glass of the reaction product in the other path is directly pressed into an emptying tank, the emptying tank is provided with a pressure monitoring device, and then the top of the emptying tank is controlled to be connected with a regulating valve on the emptying pipeline, so that the pressure of the emptying tank is controlled, the emptying pipeline leads to a waste gas recovery unit of the sodium silicate continuous production device, the pressure is properly emptied and reduced, the problem that the water glass pressure is overlarge in the subsequent step is prevented, the water glass in the emptying tank is flushed into the rotary drum filter to cause the material in the rotary drum filter to splash out, then the water glass in the emptying tank is pumped into the bottom of the rotary drum vacuum filter through a discharge device of the reaction unit, the vacuum degree of the rotary drum vacuum filter is provided by a vacuum pump, a gas-liquid separation tank is arranged on an exhaust pipeline of the vacuum pump, the exhaust pipeline is finally connected into the rotary drum, along with the rotation of the rotary drum, impurities in quartz sand and quartz sand are pumped to the surface of filter cloth of the, then the waste solids enter a buffer tank, filter cakes are scraped by a scraper of a rotary drum vacuum filter, the waste solids enter a waste solids recovery unit of a sodium silicate continuous production device through a filter cake outlet pipeline of a continuous filtering unit, the bottom of the rotary drum vacuum filter is provided with a filtering device which blocks quartz sand and impurities at the bottom of the rotary drum vacuum filter, the bottom of the rotary drum vacuum filter is also communicated with back flushing nitrogen, the impurities in the quartz sand and the quartz sand which are possibly unreacted are continuously lifted to prevent the filtering device from being blocked, a water glass discharge pipeline is connected behind the filtering device and leads to the buffer tank, a discharge pipeline at the bottom of the buffer tank extends into the bottom of a secondary filtering tank, a feeding pipeline of a feeding device of a blending tank is also immersed in the secondary filtering tank, the secondary filtering tank plays roles in settling particles and filtering dregs, and the filtered waste solids can also be sent to the waste solids recovery unit of the sodium silicate continuous production device, the inlet of the feed line of the blending tank feed device is higher than the outlet of the discharge line at the bottom of the buffer tank.

An outlet pipeline at the bottom of the sodium hydroxide storage tank is divided into a pipeline which is connected to an inlet of a sodium hydroxide feeding device of a blending tank before entering an inlet of a sodium hydroxide conveying device of a reaction unit, and then the pipeline is led to the blending tank and used for adjusting the modulus of water glass.

After the modulus adjustment, the sodium silicate particles are sent to a spray drying unit to finally obtain the sodium silicate particles.

Compared with the prior art, the technical scheme disclosed by the invention has the following beneficial effects:

1. a new sodium silicate production process is provided, and a continuous production process is adopted instead of the traditional intermittent batch production process;

2. because a continuous production process is used, the raw materials can be adjusted at any time, so that the production efficiency, the production elasticity and the process stability of the sodium silicate are improved;

3. due to continuous production, the feeding proportion of quartz sand and sodium hydroxide can be adjusted at any time when the modulus of the detected water glass needs to be adjusted, the feedback interval time is short, and the response speed is accelerated.

Drawings

FIG. 1: a schematic diagram of a continuous production process of sodium silicate;

in the figure: 1. quartz sand storage tank, 2 quartz sand conveying device, 3 sodium hydroxide storage tank, 4 reaction unit sodium hydroxide conveying device, 5 pre-reactor, 6 reactor feed pump, 7 reactor, 8 emptying tank, 9 reaction unit discharging device, 10 rotary drum vacuum filter, 11 vacuum pump, 12 buffer tank, 13 secondary filter tank, 14 blending tank feeding device, 15 blending tank sodium hydroxide feeding device, 16 blending tank, 17 spray drying unit feeding device, 18 spray drying unit.

Detailed Description

The embodiments of the present invention will be described in conjunction with the drawings in the specification, and the embodiments are disclosed for the purpose of illustrating the invention rather than limiting the invention, and all technical solutions which are simple to replace, combine and develop on the basis of the present invention shall fall within the protection scope of the present invention.