阅读说明：本技术 一种硅胶生产用梯度洗涤系统及方法 (Gradient washing system and method for silica gel production ) 是由 陈卫群 许亦祥 陈勤彰 徐建伟 于 2020-12-08 设计创作，主要内容包括：本发明公布了一种硅胶生产用梯度洗涤系统及其方法,本发明集成硅胶梯度洗涤涉及的梯度酸泡系统、梯度热水洗涤系统、捞胶系统、洗水自循环系统、压缩空气鼓气系统,通过梯度洗涤配套的工艺、装置实现高效洗涤,提高生产效率和产品稳定性,降低生产水、电、气单耗,系统实现DCS自动控制,劳动强度低、工作环境好,容易实现规模化、自动化生产,具有良好的经济效益和社会效益,具有良好的推广意义。(The invention discloses a gradient washing system for silica gel production and a method thereof, the invention integrates a gradient acid soaking system, a gradient hot water washing system, a gel fishing system, a washing water self-circulation system and a compressed air blowing system which are involved in silica gel gradient washing, realizes high-efficiency washing by a process and a device matched with the gradient washing, improves the production efficiency and the product stability, reduces the unit consumption of produced water, electricity and gas, realizes DCS automatic control by the system, has low labor intensity and good working environment, is easy to realize large-scale and automatic production, has good economic benefit and social benefit, and has good popularization significance.)

1. The gradient washing system for silica gel production is characterized by comprising a spray tower, a hot water cache tank, a washing tank, a first-level acid recovery tank, a second-level acid recovery tank, a stock solution acid tank and a pipeline mixer, wherein the quantity of the washing tank is not less than 6, every washing tank is serially connected through a serial washing pipe, every washing tank is divided into a single number and a double number, the single number washing tank adopts first-level gradient sulfuric acid to carry out acid soaking, the double number washing tank adopts second-level gradient sulfuric acid to carry out acid soaking, the spray tower supplies hot water to the hot water cache tank through a pipeline, the hot water cache tank supplies hot water to the first washing tank through a pipeline, the top of every washing tank passes through the washed acid-containing hot water to be connected with the first-level acid recovery tank through a pipeline, every washing tank passes through the acid-soaking liquid to be connected with the second-level acid recovery tank through a pipeline, the first-level acid recovery tank and the liquid outlet end of the second-level acid recovery tank respectively pass through a pipeline mixer, and the liquid inlet end of the pipeline mixer is connected with a stock solution acid tank through a pipeline, and the recovered acid solution is conveyed to the water washing tank through the pipeline by the pipeline mixer.

2. The gradient washing system for silica gel production as claimed in claim 1, wherein the water washing tank is provided with a circulating water pump and a compressed air blowing system, a circulating pump is adopted to convey water from top to bottom, and water inlet and outlet balance is realized through a flowmeter and liquid level control.

3. The gradient washing system for silica gel production as claimed in claim 1, wherein a metering pump is arranged on a serial washing pipe between each water washing tank, the hot water buffer tank is provided with a temperature and liquid level control system, and the spray tower is provided with a tap water inlet pipe.

4. A gradient washing method for silica gel production, which utilizes the gradient washing system for silica gel production as defined in claim 1, and is characterized by comprising the following steps:

firstly, respectively guiding silica gel particles obtained by the glue-making and granulation reaction of sodium silicate and dilute sulfuric acid into water washing tanks, dividing the water washing tanks into single and double tanks, through letting in one-level gradient sulphuric acid in the valve control No. single washing jar in the system, through letting in second grade gradient sulphuric acid in the valve control No. two washing jars in the system, arrange sour bubble water from washing bottom of the tank portion and advance wastewater treatment system and one-level acid recovery jar or second grade acid recovery jar respectively after the acid bubble time is accomplished, wash jar after sour bubble water is discharged to the greatest extent merges the tail jar of cluster washing system and carries out gradient hot water cluster and wash, first washing jar adopts fresh hot water washing, it drags for gluey system circulation to wash to drag for outside the washing is qualified, drag for glue and advance spray column recovery hot water in the dry tail gas and be used for the washing, every washing jar is furnished with self-loopa water pump and compressed air system, the automatic cycle and the compressed air of washing process are blown.

5. The gradient washing method for silica gel production as claimed in claim 4, wherein the self-circulation pump is continuously started in the serial washing process, the compressed air is intermittently blown, the serial washing time of each water washing tank is 4-6 h, the serial washing hot water temperature is 50-60 ℃, the compressed air is blown for 1-3 min every 1-2 h, the washing end point water pH is 4.0-4.5, and the washing end point water specific resistance is 4000-6000 Ω -cm.

6. The gradient washing method for silica gel production as claimed in claim 4, wherein the washing method is automatically controlled by adjusting valve, switch valve, pneumatic valve, on-line flow meter, on-line thermometer, on-line level meter, on-line PH meter, on-line conductivity meter, pump motor, transmission network belt motor chain matching DCS control program.

7. The gradient washing method for silica gel production as claimed in claim 4, wherein the amount and concentration of acid used for acid foam are measured and controlled by a flow meter, the mass concentration of dilute sulfuric acid used for acid foam is 3.0-3.6%, and the ratio of the amount of acid used for acid foam to the amount of silica used for gel production is 3.5-4.0.

Technical Field

The invention belongs to the technical field of inorganic silica gel production methods, and particularly relates to a gradient washing system and method for silica gel production.

Background

The inorganic silica gel is a high-activity adsorption material, belongs to an amorphous substance, is insoluble in water and any solvent, is nontoxic and odorless, has stable chemical properties, and does not react with any substance except strong alkali and hydrofluoric acid. Different types of silica gel form different microporous structures due to different manufacturing methods. The chemical components and physical structure of silica gel determine that the silica gel has the characteristics that a plurality of other similar materials are difficult to replace: high adsorption performance, good thermal stability, stable chemical property, higher mechanical strength and the like. At present, the washing automation degree of the silica gel production process is low, most of the acid soaking process and the washing process need manual operation, the labor intensity is high, production reworking is easily caused by mistakes, the production efficiency is low, and energy, water, acid and electricity can not be really saved.

Disclosure of Invention

Technical problem to be solved

The washing automation degree of the silica gel production process is low, most of the acid soaking process and the washing process need manual operation, the labor intensity is high, production reworking is easily caused by mistakes, the production efficiency is low, and energy conservation, water conservation, acid conservation and electricity conservation in the true sense are difficult to realize.

Technical scheme

In order to solve the technical problem, the invention provides a gradient washing system for silica gel production, which comprises a spray tower, hot water buffer tanks, water washing tanks, a first-stage acid recovery tank, a second-stage acid recovery tank, a stock solution acid tank and a pipeline mixer, wherein the number of the water washing tanks is not less than 6, each water washing tank is connected in series through a serial washing pipe, each water washing tank is divided into a single number and a double number, the single-number water washing tank is subjected to acid soaking by adopting first-stage gradient sulfuric acid, the double-number water washing tank is subjected to acid soaking by adopting second-stage gradient sulfuric acid, the spray tower supplies hot water to the hot water buffer tanks through a pipeline, the hot water buffer tanks supply the hot water to the first water washing tank through a pipeline, the top of each water washing tank connects the acid-containing hot water after washing to the first-stage acid recovery tank through a pipeline, the bottom of each water washing tank connects an acid soaking liquid to the second-, the liquid outlet ends of the first-stage acid recovery tank and the second-stage acid recovery tank are respectively connected with a pipeline mixer through pipelines, the liquid inlet end of the pipeline mixer is connected with an original liquid acid tank through a pipeline, and the recovered acid liquid is conveyed to the water washing tank through a pipeline by the pipeline mixer.

Furthermore, the washing tank is provided with a circulating water pump and a compressed air blowing system, a circulating pump is adopted to convey water to enter from top to bottom, and water inlet and outlet balance is realized through a flow meter and liquid level control.

Furthermore, a metering pump is arranged on a serial washing pipe between the water washing tanks, the hot water cache tank is provided with a temperature and liquid level control system, and the spray tower is provided with a tap water inlet pipe.

A gradient washing method for silica gel production is provided, and the gradient washing system for silica gel production specifically comprises the following steps:

firstly, respectively guiding silica gel particles obtained by the glue-making and granulation reaction of sodium silicate and dilute sulfuric acid into water washing tanks, dividing the water washing tanks into single and double tanks, through letting in one-level gradient sulphuric acid in the valve control No. single washing jar in the system, through letting in second grade gradient sulphuric acid in the valve control No. two washing jars in the system, arrange sour bubble water from washing bottom of the tank portion and advance wastewater treatment system and one-level acid recovery jar or second grade acid recovery jar respectively after the acid bubble time is accomplished, wash jar after sour bubble water is discharged to the greatest extent merges the tail jar of cluster washing system and carries out gradient hot water cluster and wash, first washing jar adopts fresh hot water washing, it drags for gluey system circulation to wash to drag for outside the washing is qualified, drag for glue and advance spray column recovery hot water in the dry tail gas and be used for the washing, every washing jar is furnished with self-loopa water pump and compressed air system, the automatic cycle and the compressed air of washing process are blown.

Furthermore, a self-circulation pump is continuously started in the serial washing process, compressed air is intermittently blown, the serial washing time of each washing tank is 4-6 hours, the temperature of serial washing hot water is 50-60 ℃, the compressed air is blown for 1-3 min every 1-2 hours, the pH value of washing end point water is 4.0-4.5, and the specific water resistance of the washing end point is 4000-6000 omega cm.

Furthermore, the washing method realizes automatic control by the interlocking matching of a regulating valve, a switch valve, a pneumatic valve, an online flowmeter, an online thermometer, an online liquid level meter, an online PH meter, an online conductivity meter, a pump motor and a transmission network belt motor with a DCS control program.

Further, the dosage and the preparation concentration of acid for acid soaking are measured and controlled by a flow meter, the mass concentration of dilute sulfuric acid for acid soaking is 3.0-3.6%, and the ratio of the acid quantity for acid soaking to the silica quantity for glue making is 3.5-4.0.

(3) Advantageous effects

The invention has the beneficial effects that: the invention overcomes the defects of industrial large-scale production, realizes the electric automatic control of silica gel production through the decentralized integrated control of a process system device and the reasonable layout of process equipment flows, saves energy and reduces emission, has environmental protection significance, and solves the technical problems of low automation degree of washing in the silica gel production process, manual operation in most of the acid soaking process and the washing process, high manual strength, easy error, production rework, low production efficiency and difficult realization of energy saving, water saving, acid saving and electricity saving in the real sense in the prior art.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a process flow diagram of a gradient washing system for silica gel production.

Detailed Description

The technical solutions in the embodiments of the present invention are further clearly and completely described below with reference to the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Example one

Referring to fig. 1, the embodiment provides a gradient washing system for silica gel production, which includes a spray tower 1, a hot water buffer tank 2, a washing tank, a first-stage acid recovery tank 9, a second-stage acid recovery tank 10, a stock solution acid tank 11, a first pipeline mixer 12 and a second pipeline mixer 13, the number of the washing tanks is 6, the washing tanks are respectively a washing tank 3, a washing tank 4, a washing tank 5, a washing tank 6, a washing tank 7, a washing tank 8, and each washing tank is connected in series through a serial washing pipe, each washing tank is divided into a single number and a double number, the single-number washing tank adopts the first-stage gradient sulfuric acid for acid soaking, the double-number washing tank adopts the second-stage gradient sulfuric acid for acid soaking, the spray tower 1 supplies hot water to the hot water buffer tank 2 through a pipeline, the buffer hot water tank 2 supplies hot water to the first-stage acid tank through an acid pipeline, the top of each washing tank connects the washed hot water to the first-stage acid recovery tank 9 through a pipeline, every the bottom of washing jar passes through pipe connection second grade acid recovery tank 10 with acid soaking liquid, first grade acid recovery tank 9 with the play liquid end of second grade acid recovery tank 10 is respectively through pipe connection pipeline mixer, and pipeline mixer's feed liquor end passes through pipe connection stoste acid tank, the acidizing fluid that the pipeline mixer will retrieve comes passes through the pipeline and carries extremely washing jar.

In addition, in the embodiment, the water washing tank is provided with a circulating water pump and a compressed air blowing system, a circulating pump is adopted to convey water to enter and exit from the top, and water inlet and outlet balance is realized through a flow meter and liquid level control. Each serial washing pipe between the washing tanks is provided with a metering pump, the hot water cache tank 2 is provided with a temperature and liquid level control system, and the spray tower 1 is provided with a tap water inlet pipe.

The embodiment provides a gradient washing method for silica gel production, which specifically comprises the following steps: firstly, respectively guiding silica gel particles obtained by the glue-making and granulation reaction of sodium silicate and dilute sulfuric acid into water washing tanks, dividing the water washing tanks into single and double tanks, leading in one-level gradient sulfuric acid in the single-number washing tank is adjusted through a valve in the system, leading in two-level gradient sulfuric acid in the double-number washing tank is adjusted through a valve in the system, acid bubble water is discharged from the bottom of the washing tank after acid bubble time is finished and respectively enters a wastewater treatment system and a one-level acid recovery tank 9 or a two-level acid recovery tank 10, the washing tank after the acid bubble water is discharged is merged into a tail tank of a serial washing system for gradient hot water serial washing, fresh hot water is adopted for washing in the first washing tank, glue is fished out from a glue system for circular washing after washing is qualified, hot water is recovered by a spray tower 1 in dry tail gas for washing, each washing tank is provided with a self-circulation water pump and a compressed air blowing system, and automatic circulation and compressed air blowing in the washing process are realized. And (3) continuously starting a self-circulation pump in the serial washing process, intermittently blowing compressed air, wherein the serial washing time of each washing tank is 4-6 h, the temperature of serial washing hot water is 50-60 ℃, the compressed air is blown every 1-2 h for 1-3 min, the pH value of washing end point water is 4.0-4.5, and the water specific resistance of the washing end point is 4000-6000 omega cm. The washing method realizes automatic control by interlocking and matching a regulating valve, a switch valve, a pneumatic valve, an online flowmeter, an online thermometer, an online liquid level meter, an online PH meter, an online conductivity meter, a pump motor and a transmission network belt motor with a DCS control program. The dosage and the preparation concentration of acid for acid soaking are measured and controlled by a flowmeter, the mass concentration of dilute sulfuric acid for acid soaking is 3.0-3.6%, and the ratio of the acid quantity for acid soaking to the silica quantity for glue making is 3.5-4.0. The experimental pickling data for this example are as follows:

gradient washing water	Sulfuric acid content%	Sulfate radical content%	Total solid content%
				Water washing tank 1	0.02	0.17	0.25
Water washing tank 2	0.07	0.53	0.65
				Washing tank 3	0.17	1.34	1.49
Water washing tank 4	0.31	1.48	2.74
				Water washing tank 5	0.51	2.08	3.95
Water washing tank 6	0.61	3.77	6.22

The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.