CN212127541U - Clean comprehensive utilization system of vermiculite processing - Google Patents
Clean comprehensive utilization system of vermiculite processing Download PDFInfo
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- CN212127541U CN212127541U CN202020338858.XU CN202020338858U CN212127541U CN 212127541 U CN212127541 U CN 212127541U CN 202020338858 U CN202020338858 U CN 202020338858U CN 212127541 U CN212127541 U CN 212127541U
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Abstract
The embodiment of the utility model discloses clean comprehensive utilization system of vermiculite processing, the system is including the liquid grinding device, first agitated vessel, first vacuum filtration equipment, second agitated vessel, second vacuum filtration equipment, third agitated vessel, third vacuum filtration equipment, fourth agitated vessel, evaporimeter and the condenser that connect gradually. The system combines the characteristics of the chlor-alkali industry on the basis of vermiculite processing, can carry out the production combination process of the vermiculite and the chlor-alkali industry, is beneficial to reducing the cost of vermiculite processing products and realizing clean and efficient utilization of resources, and can realize energy conservation and emission reduction of the chlor-alkali industry.
Description
Technical Field
The utility model relates to a vermiculite processing technology field, concretely relates to clean comprehensive utilization system of vermiculite processing.
Background
Vermiculite is a natural, inorganic and nontoxic mineral substance, can expand under the action of high temperature, belongs to silicate, has a monoclinic crystal structure, and can be expressed as the following molecular formula:
(Mg，Fe，Al)3[(Si，Al)4O10(OH)2]·4H2O。
vermiculite is produced when certain granites are hydrated, which is generally produced simultaneously with asbestos. Because vermiculite has ion exchange capacity, it has great effect on soil nutrition. Expanded vermiculite is widely used, but its main use is still as building material, including building: such as lightweight materials, lightweight concrete aggregates (lightweight wall powder, lightweight mortar), heat-resistant materials, wall materials, fire-proof boards, fire-proof mortar, fire-resistant bricks; heat preservation and heat insulation: such as sound absorbing materials, underground pipes, greenhouse pipes, thermal insulating materials, interiors of rooms and tunnels, walls and ceilings of public places; metallurgy: for example, steel frame cladding material, iron making, casting slag removal, cladding material of high-rise building steel frames, and vermiculite bulk material; agriculture and forestry: such as golf course lawns, seed preservants, soil conditioners, wetting agents, plant growth agents, feed additives, baits; and other aspects: comprises an adsorbent, a filter aid, active carriers of chemicals and fertilizers, sewage treatment, seawater oil stain adsorption, a cigarette filter tip, an explosive density regulator and the like. These uses for vermiculite are based on vermiculite itself and not on decomposition products.
Chlor-alkali, i.e. the chlor-alkali industry, also refers to the process for producing chlorine, hydrogen, caustic soda using saturated brine. Industrial preparation of NaOH and Cl by electrolysis of saturated NaCl solution2And H2And a series of chemical products are produced by taking the raw materials as raw materials, which is called chlor-alkali industry. The chlor-alkali industry is one of the most basic chemical industries and its products are widely used in the light industry, textile industry, metallurgical industry, petrochemical industry and utilities, in addition to the chemical industry itself.
The existing vermiculite processing and chlor-alkali industry are not necessarily connected, and the comprehensive utilization and the environment-friendly clean production of the vermiculite and the chlor-alkali industry cannot be realized.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a clean comprehensive utilization system of vermiculite processing, this system have combined the characteristics of chlor-alkali industry on the basis of vermiculite processing, can carry out production combined process between them, and existing cost that is favorable to reducing the vermiculite processing product utilizes with the clean high efficiency that realizes the resource, can realize the energy saving and emission reduction of chlor-alkali industry again.
In order to achieve the above object, an aspect of the embodiments of the present invention provides a vermiculite processing cleaning comprehensive utilization system, which includes a liquid grinding device, a first stirring device, a first vacuum filtering device, a second stirring device, a second vacuum filtering device, a third stirring device, a third vacuum filtering device, a fourth stirring device, an evaporator and a condenser connected in sequence, wherein a condensed water outlet of the condenser is connected to the liquid grinding device; wherein
The first stirring device and the fourth stirring device are connected to the output end of a hydrochloric acid product line of a chlor-alkali chemical plant; the second stirring device and the third stirring device are connected to the output end of a sodium hydroxide product line of a chlor-alkali chemical plant; said fourth stirring device and said evaporator also have respective outlets for connection to a crude salt refining plant of a chloralkali chemical plant.
Further, the liquid milling apparatus is provided with a classifying screen. The grading screen is used for controlling the grinding particle size of the raw materials of the liquid grinding equipment, the ground suspension is filtered by the liquid grading screen, the filtered solids are returned to the liquid grinding equipment for continuous grinding until the ground suspension completely passes through the grading screen, and the required vermiculite suspension is obtained.
Further, the mesh number of the grading screen is 600-1250 meshes. The mesh number of the screen can be suitable for the requirements of most vermiculite suspensions, and the specific mesh number can be determined according to the product requirements, such as the corresponding mesh number determined according to the specific surface area of the silicon dioxide powder product obtained according to the requirements.
Furthermore, the third vacuum filtration equipment is also connected with filter cake cleaning equipment and hydrothermal synthesis equipment. The filter cake cleaning equipment can comprise a flushing pipeline arranged in the filter press and used for flushing filter cakes stored in a filter cavity of the filter press; the hydrothermal synthesis apparatus may include a hydrothermal synthesizer, such as a microwave hydrothermal parallel synthesizer, such as an XH-800S microwave hydrothermal parallel synthesizer.
Another aspect of the embodiments of the present invention provides a method for processing vermiculite to clean and comprehensively utilize, the method comprising the following steps:
(1) adding water and expanded vermiculite into liquid grinding equipment according to the volume ratio of (10-20): 1, and grinding to obtain vermiculite suspension; this volumetric ratio provides sufficient grinding conditions for the expanded vermiculite and facilitates the content requirements for water as a solvent or reactant in the subsequent steps; when the volume ratio is less than 10:1, there is a possibility that insufficient grinding of the exfoliated vermiculite and insufficient subsequent water amount are caused, and when the volume ratio exceeds 20:1, there is a possibility that cost (water consumption) is increased and man-hours are unnecessarily increased;
(2) conveying the vermiculite suspension to a first stirring device, adding hydrochloric acid while stirring at 60 ℃, and continuously heating and stirring for 12-36 hours to obtain an acid solution mixture containing silicon dioxide; the mass concentration of the hydrochloric acid is 10%, and the volume ratio of the vermiculite suspension to the hydrochloric acid is (5-6): 1; stirring at 60 ℃ provides a better balance between reaction rate and energy consumption, and the volume ratio of vermiculite suspension to hydrochloric acid allows for a suitable degree of vermiculite treatment and pH of the acid solution;
(3) conveying the acid solution mixture containing the silicon dioxide to a first vacuum filtration device for filtration to obtain a first filter cake and a first filtrate, and drying the first filter cake to obtain a silicon dioxide powder product; conveying the first filtrate to second stirring equipment;
(4) adding hydrogen peroxide into the first filtrate until the solution turns to light red, slowly adding a sodium hydroxide solution into the solution while stirring at 60 ℃ to generate brick red precipitate, and continuously adding the sodium hydroxide solution while slowly stirring until the brick red precipitate is not generated any more, wherein the pH value of the solution is controlled to be not higher than 4.5; the mass concentration of the hydrogen peroxide is 30%, and the concentration of the sodium hydroxide solution is 1 mol/L; stirring at 60 ℃ can provide a better balance between reaction speed and energy consumption, and the concentration of the sodium hydroxide solution can obtain a proper solution concentration under the condition of meeting the pH value requirement, so that the subsequent treatment step is facilitated;
(5) conveying the solution mixture containing the brick red precipitate obtained in the step (4) to a second vacuum filtration device for filtration to obtain a second filter cake and a second filtrate, drying the second filter cake to obtain an iron hydroxide powder product, and conveying the second filtrate to a third stirring device;
(6) adding a sodium hydroxide solution into the second filtrate rapidly under stirring, and increasing the stirring speed to mix the solution rapidly and uniformly, for example, increasing the stirring speed by 3-5 times to generate a white precipitate; the concentration of the sodium hydroxide solution is 1mol/L, and the volume ratio of the second filtrate to the sodium hydroxide solution is (1.5-2.5): 1, preferably 2: 1; the volume ratio of the second filtrate to the sodium hydroxide solution takes into account the requirements of the subsequent treatment steps (such as hydrothermal synthesis) on the concentration of the solution, so that the subsequent steps react sufficiently and quickly;
(7) conveying the solution mixture containing the white precipitate obtained in the step (6) to third vacuum filtration equipment for filtration to obtain a third filter cake and a third filtrate, treating the third filter cake to obtain a magnesium-aluminum hydrotalcite colloidal solution, and conveying the third filtrate to fourth stirring equipment;
(8) to the third filtrate, hydrochloric acid was slowly added, and the solution was adjusted to neutral (pH 7) to obtain a light brine. Adjusting the solution to neutral can meet the requirements for subsequent recycling (e.g., delivery to a chloralkali chemical plant).
Further, the method further comprises:
(9) conveying the light salt water to a crude salt refining workshop of a chlor-alkali chemical plant to be used as a raw material to enter a chlor-alkali production process; and/or conveying the light salt water to an evaporator for evaporation and crystallization to obtain crude salt, and taking the crude salt as a raw material to enter a chlor-alkali production process. The evaporative crystallization is carried out in the range of 100-120 ℃. This temperature allows to obtain a better balance between evaporation rate and energy consumption, which, when the temperature is less than 100 ℃, may lead to an unnecessary increase in the evaporation crystallization time and is not compatible with the production of chlor-alkali plants; and when the temperature exceeds 120 c, unnecessary power consumption may be increased.
Further, the method further comprises:
(10) and (3) conveying the steam in the evaporator to a condenser for condensation to obtain condensed water, and adding the condensed water serving as a raw material to the step (1).
Namely, the obtained condensed water can be used as water in the step (1) and added into liquid grinding equipment together with expanded vermiculite for grinding, so that the condensed water is put into the next circulation process.
Further, the third filter cake in the step (7) is subjected to filter cake cleaning and hydro-thermal synthesis treatment to obtain a magnesium-aluminum hydrotalcite colloidal solution.
Further, the hydrochloric acid and the sodium hydroxide solution used in the process are both products from a chlor-alkali chemical plant.
Further, the liquid grinding equipment in the step (1) is provided with a grading screen, the raw material grinding particle size of the liquid grinding equipment is controlled through the grading screen, the ground suspension is filtered through the liquid grading screen, the filtered solid returns to the liquid grinding equipment to be continuously ground, and finally the vermiculite suspension passes through a screen 1250 mesh. As a non-limiting example, the silica powder product with higher specific surface area can be obtained with less energy consumption by sieving the vermiculite suspension with a 1250-mesh sieve, which is beneficial to improving the added value of the product.
The embodiment of the utility model provides a have following advantage:
1. the utility model discloses technical scheme combines together vermiculite processing and chlor-alkali industry, obtains production combined process, existing cost that is favorable to reducing the vermiculite processing product and the clean high efficiency utilization of realization resource can realize chlor-alkali industry energy saving and emission reduction again.
2. The expanded vermiculite is ground, sequentially mixed with acid, alkali and the like, filtered, dried and the like, so that silicon dioxide powder, ferric hydroxide powder and magnesium aluminum hydrotalcite colloid are gradually separated, and the application range of the vermiculite product is expanded.
3. The system is easily obtained by combining the existing equipment, the process flow of the method is simple, and the reaction flow is easily controlled by adjusting the parameters of each equipment and step by a person skilled in the art so as to obtain the required product.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
Fig. 1 is a schematic view of the structure and process flow of a vermiculite processing clean comprehensive utilization system and method provided by the embodiment of the present invention.
Wherein the reference numerals are:
1. liquid grinding equipment and a grading screen; 2. a first stirring device; 3. a first vacuum filtration device; 4. a second stirring device; 5. a second vacuum filtration device; 6. a third stirring device; 7. a third vacuum filtration device; 8. a fourth stirring device; 9. an evaporator; 10. a condenser; 11. filter cake cleaning equipment and hydrothermal synthesis equipment.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, in one embodiment, the vermiculite processing and cleaning comprehensive utilization system comprises a liquid grinding device 1, a first stirring device 2, a first vacuum filtering device 3, a second stirring device 4, a second vacuum filtering device 5, a third stirring device 6, a third vacuum filtering device 7, a fourth stirring device 8, an evaporator 9 and a condenser 10 which are connected in sequence, wherein a condensed water outlet of the condenser 10 is connected with the liquid grinding device 1;
in addition, the liquid grinding equipment 1 is provided with a grading screen for controlling the grinding particle size of the raw materials of the liquid grinding equipment 1, the ground suspension is filtered by the liquid grading screen, the filtered solid is returned to the liquid grinding equipment 1 for continuous grinding until the ground suspension passes through the grading screen completely, and the required vermiculite suspension is obtained. The mesh number of the grading screen is 600-1250 meshes. The mesh number of the screen can be set to meet the requirements of most vermiculite suspensions, and the specific mesh number can be determined according to the requirements of products.
The first stirring device 2 and the fourth stirring device 8 are connected to the output end of the hydrochloric acid product line of the chlor-alkali chemical plant; the second stirring device 4 and the third stirring device 6 are connected to the output end of a sodium hydroxide product line of a chlor-alkali chemical plant; the fourth stirring device 8 and the evaporator 9 also have respective outlets for connection to the crude salt refining plant of the chloralkali chemical plant.
The third vacuum filtering device 7 is also connected with a filter cake cleaning device and a hydrothermal synthesis device 11. The filter cake cleaning equipment is a flushing pipeline arranged in the filter press and used for flushing filter cakes stored in a filter cavity of the filter press; the hydrothermal synthesis equipment is an XH-800S microwave hydrothermal parallel synthesizer of Beijing auspicin science and technology.
Example 2
As shown in fig. 1, in one embodiment, the method for processing and cleaning vermiculite comprises the following steps:
(1) adding water and expanded vermiculite into a liquid grinding device 1 according to a volume ratio of 15:1 for grinding to obtain vermiculite suspension; the liquid grinding equipment 1 is provided with a grading screen, the raw material grinding particle size of the liquid grinding equipment is controlled by the grading screen, ground suspension is filtered by the liquid grading screen, filtered solids are returned to the liquid grinding equipment for continuous grinding, and finally vermiculite suspension passes through a screen 1250 meshes;
(2) conveying the vermiculite suspension to a first stirring device 2, adding hydrochloric acid (from a chlor-alkali chemical plant) while stirring at 60 ℃, and continuously heating and stirring for 12-36 hours to obtain an acid solution mixture containing silicon dioxide; the mass concentration of the hydrochloric acid is 10%, and the volume ratio of the vermiculite suspension to the hydrochloric acid is 5: 1;
(3) conveying the acid solution mixture containing the silicon dioxide to a first vacuum filtration device 3 for filtration to obtain a first filter cake and a first filtrate, and drying the first filter cake to obtain a silicon dioxide powder product; the first filtrate is conveyed to a second stirring device 4;
(4) adding hydrogen peroxide into the first filtrate until the solution turns to light red, slowly adding sodium hydroxide solution (from a chloralkali plant) into the solution while stirring at 60 ℃ to generate brick red precipitate, and continuously adding the sodium hydroxide solution while slowly stirring until the brick red precipitate is not generated any more, wherein the pH value of the solution is controlled to be not higher than 4.5; the mass concentration of the hydrogen peroxide is 30%, and the concentration of the sodium hydroxide solution is 1 mol/L;
(5) conveying the solution mixture containing the brick-red precipitate obtained in the step (4) to a second vacuum filtering device 5 for filtering to obtain a second filter cake and a second filtrate, drying the second filter cake to obtain an iron hydroxide powder product, and conveying the second filtrate to a third stirring device 6;
(6) adding sodium hydroxide solution (from a chlor-alkali chemical plant) into the second filtrate rapidly under stirring, and increasing the stirring speed by 3 times to mix rapidly and uniformly, thereby generating white precipitate instantly; the concentration of the sodium hydroxide solution is 1mol/L, and the volume ratio of the second filtrate to the sodium hydroxide solution is 2: 1;
(7) conveying the solution mixture containing the white precipitate obtained in the step (6) to a third vacuum filtering device 7 for filtering to obtain a third filter cake and a third filtrate, cleaning the third filter cake and carrying out hydro-thermal synthesis treatment to obtain a magnesium-aluminum hydrotalcite colloidal solution, and conveying the third filtrate to a fourth stirring device 8;
(8) slowly adding hydrochloric acid to the third filtrate, and adjusting the solution to be neutral (pH 7) to obtain a light brine;
(9) conveying the light salt water to a crude salt refining workshop of a chlor-alkali chemical plant to be used as a raw material to enter a chlor-alkali production process; in addition, the light salt water is conveyed to an evaporator 9 to be evaporated and crystallized at 120 ℃ to obtain crude salt which is used as a raw material to enter a chlor-alkali production process;
(10) and (3) conveying the steam in the evaporator 9 to a condenser 10 for condensation to obtain condensed water, and adding the condensed water serving as a raw material into the step (1). The obtained condensed water can be used as water in the step (1) and is added into the liquid grinding equipment 1 together with the expanded vermiculite for grinding, so that the condensed water is put into the next circulation process.
The utility model discloses technical scheme combines together vermiculite processing and chlor-alkali industry, obtains production combined process through grinding the expanded vermiculite, in proper order with operations such as mixing, filtration, drying such as acid, alkali, separates silica powder, iron hydroxide powder and magnesium aluminium hydrotalcite colloid gradually, has expanded the range of application of vermiculite product. The method is beneficial to reducing the cost of vermiculite processing products, realizing clean and efficient utilization of resources and realizing energy conservation and emission reduction of the chlor-alkali industry. The system is easily obtained by combining the existing equipment, the process flow of the method is simple, and the reaction flow is easily controlled by adjusting the parameters of each equipment and step by a person skilled in the art so as to obtain the required product.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (4)
1. A vermiculite processing cleaning comprehensive utilization system is characterized by comprising a liquid grinding device, a first stirring device, a first vacuum filtering device, a second stirring device, a second vacuum filtering device, a third stirring device, a third vacuum filtering device, a fourth stirring device, an evaporator and a condenser which are sequentially connected, wherein a condensed water outlet of the condenser is connected with the liquid grinding device; wherein
The first stirring device and the fourth stirring device are connected to the output end of a hydrochloric acid product line of a chlor-alkali chemical plant; the second stirring device and the third stirring device are connected to the output end of a sodium hydroxide product line of a chlor-alkali chemical plant; said fourth stirring device and said evaporator also have respective outlets for connection to a crude salt refining plant of a chloralkali chemical plant.
2. The vermiculite processing and cleaning comprehensive utilization system according to claim 1, wherein the liquid grinding equipment is provided with a grading screen, and the mesh number of the grading screen is 600-1250 meshes.
3. The vermiculite processing clean comprehensive utilization system according to claim 1, wherein the third vacuum filtration equipment is further connected with filter cake cleaning equipment and hydrothermal synthesis equipment.
4. The vermiculite processing clean comprehensive utilization system according to claim 3, wherein the filter cake cleaning equipment comprises a flushing pipeline arranged in a filter press; the hydrothermal synthesis equipment comprises a microwave hydrothermal parallel synthesizer.
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| CN202020338858.XU CN212127541U (en) | 2020-03-17 | 2020-03-17 | Clean comprehensive utilization system of vermiculite processing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285379A (en) * | 2020-03-17 | 2020-06-16 | 塔里木大学 | Vermiculite processing clean comprehensive utilization system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285379A (en) * | 2020-03-17 | 2020-06-16 | 塔里木大学 | Vermiculite processing clean comprehensive utilization system and method |
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