阅读说明：本技术 降低碳酸镁中氯化物含量的节水高效的洗涤方法及装置 (Water-saving and efficient washing method and device for reducing chloride content in magnesium carbonate ) 是由 尹全义 邢煊 翟立强 孙孟勇 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种降低碳酸镁中氯化物含量的节水高效的洗涤方法及装置,涉及化工除杂技术领域；它的方法如下：步骤一：原料的调浆、洗涤；步骤二：碳酸镁的调浆、洗涤；步骤三：固液分离、干燥,滤液收集后,作为合成反应中调浆用水：本发明能够使氯离子能够充分与水接触,并溶解于水中,提高洗涤效果,有效降低氯化物含量；浆液循环经过超声洗涤,不仅使浆液洗涤彻底、充分,而且减小了超声设备的功率,有效的降低了能耗；将洗涤水、滤液回用,洗涤水经离子交换后循环利用,大大降低了水消耗量,保护环境。(The invention discloses a water-saving and efficient washing method and device for reducing chloride content in magnesium carbonate, and relates to the technical field of chemical impurity removal; the method comprises the following steps: the method comprises the following steps: mixing and washing raw materials; step two: mixing and washing magnesium carbonate; step three: solid-liquid separation and drying are carried out, and after filtrate is collected, the filtrate is used as water for size mixing in the synthesis reaction: the invention can ensure that chloride ions can be fully contacted with water and dissolved in the water, thereby improving the washing effect and effectively reducing the chloride content; the slurry is circularly washed by the ultrasonic, so that the slurry is thoroughly and fully washed, the power of ultrasonic equipment is reduced, and the energy consumption is effectively reduced; the washing water and the filtrate are recycled, and the washing water is recycled after ion exchange, so that the water consumption is greatly reduced, and the environment is protected.)

1. The water-saving and efficient washing method for reducing the chloride content in magnesium carbonate is characterized in that: the method comprises the following steps:

the method comprises the following steps: mixing and washing raw materials:

mixing the raw material for producing magnesium carbonate and water according to a certain proportion, mixing, controlling the concentration to be 5-50g/L, starting a heating device, controlling the temperature of the slurry to be 40-90 ℃, starting a stirring and circulating device, and stirring for 30-150 min; after stirring, performing solid-liquid separation on the slurry by adopting centrifugal dehydration or plate-and-frame filter press equipment; conveying the separated semi-solid raw material to a synthesis reaction kettle; collecting the filtrate, treating with ion exchange resin, and washing again;

step two: slurry mixing and washing of magnesium carbonate:

after the synthesis of magnesium carbonate is finished, carrying out solid-liquid separation, collecting filtrate, treating the filtrate by ion exchange resin, and washing again;

transferring the separated magnesium carbonate into a washing tank, adding a proper amount of water to mix slurry, and controlling the concentration of the slurry to be 5-50 g/L; starting the heating device, controlling the temperature of the slurry to be 40-90 ℃, starting the circulating device, circulating the slurry in the two washing tanks under the action of the circulating pump, adjusting the parameters of the circulating pump and a flow regulating valve, controlling the flow to be 5-10m for carrying out the cultivation/h, and keeping the second washing tank full of the slurry; opening an ultrasonic device in the second washing tank, and adjusting the ultrasonic frequency and the power to 60% -95% of the rated power; washing for 20-100 min;

step three: solid-liquid separation and drying:

and after washing is finished, carrying out solid-liquid separation on the slurry, drying the separated magnesium carbonate to obtain a product, and collecting filtrate to be used as water for size mixing in the synthesis reaction.

2. The water-saving and efficient washing method for reducing the chloride content in magnesium carbonate according to claim 1, characterized in that: and in the second step, the temperature of the mixed water after the two solid-liquid separations is 40-90 ℃.

3. The water-saving and efficient washing method for reducing the chloride content in magnesium carbonate according to claim 1, characterized in that: the two washing tanks are respectively provided with a large stirring device and a small stirring device.

4. Reduce water conservation high efficiency washing device of chloride content in magnesium carbonate, its characterized in that: comprises a first washing tank, a second washing tank, a stirring device, a heating device, an ultrasonic device, a circulating pump and a backflow pipeline; the right lower end of the first washing tank is connected with the upper side of the second washing tank through a pipeline, a circulating pump is installed on the pipeline, a stirring device and a heating device are installed in the first washing tank, the bottom of the second washing tank is connected with the upper side of the first washing tank through a backflow pipeline, a flow regulating valve is arranged on the backflow pipeline, an ultrasonic device is installed inside the second washing tank, and the first washing tank is sequentially connected with a dewatering device, an ion exchange device and a collecting pool to form a water circulation passage.

Technical Field

The invention belongs to the technical field of chemical impurity removal, and particularly relates to a water-saving and efficient washing method and device for reducing the chloride content in magnesium carbonate.

Background

When the magnesium carbonate is synthesized by a chemical method, more or less impurity chloride ions are carried in the used raw materials, which has great influence on the application of the magnesium carbonate and even limits the application of the magnesium carbonate in some advanced precision industries, so the impurity chloride ions must be removed in the production process. At present, a method of water washing removal is mainly adopted, the method has low efficiency and poor effect, and water consumption is huge, thereby causing water resource waste.

Disclosure of Invention

The method aims to solve the technical problems of low efficiency, poor effect, huge water consumption and water resource waste of the existing method for removing by water washing; the invention aims to provide a water-saving and efficient washing method and device for reducing the chloride content in magnesium carbonate.

The invention relates to a water-saving and high-efficiency washing method for reducing chloride content in magnesium carbonate, which comprises the following steps:

the method comprises the following steps: mixing and washing raw materials:

mixing the raw material for producing magnesium carbonate and water according to a certain proportion, mixing, controlling the concentration to be 5-50g/L, starting a heating device, controlling the temperature of the slurry to be 40-90 ℃, starting a stirring and circulating device, and stirring for 30-150 min; after stirring, performing solid-liquid separation on the slurry by adopting centrifugal dehydration or plate-and-frame filter press equipment; conveying the separated semi-solid raw material to a synthesis reaction kettle; collecting the filtrate, treating with ion exchange resin, and washing again;

step two: slurry mixing and washing of magnesium carbonate:

after the synthesis of magnesium carbonate is finished, carrying out solid-liquid separation, collecting filtrate, treating the filtrate by ion exchange resin, and washing again;

transferring the separated magnesium carbonate into a washing tank, adding a proper amount of water to mix slurry, and controlling the concentration of the slurry to be 5-50 g/L; starting the heating device, controlling the temperature of the slurry to be 40-90 ℃, starting the circulating device, circulating the slurry in the two washing tanks under the action of the circulating pump, adjusting the parameters of the circulating pump and a flow regulating valve, controlling the flow to be 5-10m for carrying out the cultivation/h, and keeping the second washing tank full of the slurry; opening an ultrasonic device in the second washing tank, and adjusting the ultrasonic frequency and the power to 60% -95% of the rated power; washing for 20-100 min;

step three: solid-liquid separation and drying:

after washing is finished, carrying out solid-liquid separation on the slurry, and drying the separated magnesium carbonate to obtain a product; the filtrate was collected and used as water for slurry-mixing in the synthesis reaction.

Preferably, the temperature of the water after mixing for the two solid-liquid separations in the second step is 40 to 90 ℃.

Preferably, the two washing tanks are large and small, and both are provided with a stirring device.

Preferably, an ultrasonic device is installed in the second washing tank, so that the washing requirements are met with low equipment power and equipment investment.

A water-saving and efficient washing device for reducing the content of chloride in magnesium carbonate comprises a first washing tank, a second washing tank, a stirring device, an ultrasonic device, a circulating pump, a backflow pipeline, a heating device and a flow regulating valve; the right lower end of the first washing tank is connected with the upper side of the second washing tank through a pipeline, a circulating pump 5 is installed on the pipeline, a stirring device and a heating device are installed in the first washing tank, the bottom of the second washing tank is connected with the upper side of the first washing tank through a backflow pipeline, a flow regulating valve is arranged on the backflow pipeline, an ultrasonic device is installed inside the second washing tank, and the first washing tank is sequentially connected with a dewatering device, an ion exchange device and a collecting pool to form a water circulation path.

Compared with the prior art, the invention has the beneficial effects that:

firstly, chloride ions can be fully contacted with water and dissolved in the water, so that the washing effect is improved, and the chloride content is reduced;

secondly, the slurry is circularly washed by ultrasonic, so that the energy consumption and the equipment investment are effectively reduced;

washing and production reaction operations can be combined into one, the labor capacity and the production period are not increased, and the efficiency is high;

and fourthly, the pulping water and the washing water are recycled, so that the consumption of the production water is greatly reduced, and meanwhile, the environment is protected because no wastewater is discharged basically.

Drawings

For ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: 1-washing tank one; 2-washing tank two; 3-a stirring device; 4-an ultrasonic device; 5-a circulating pump; 6-a return line; 7-a heating device; 8-a flow regulating valve; 9-a dewatering device; 10-ion exchange equipment; 11-collection pool.

Detailed Description

In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.

As shown in fig. 1, the following technical solutions are adopted in the present embodiment: the washing method comprises the following steps:

the method comprises the following steps: mixing and washing raw materials:

mixing the raw material for producing magnesium carbonate and water according to a certain proportion, mixing, controlling the concentration to be 5-50g/L, starting a heating device, controlling the temperature of the slurry to be 40-90 ℃, starting a stirring and circulating device, and stirring for 30-150 min; after stirring, performing solid-liquid separation on the slurry by adopting centrifugal dehydration or plate-and-frame filter press equipment and the like; conveying the separated semi-solid raw material to a synthesis reaction kettle; collecting the filtrate, treating with ion exchange resin, and washing again;

in the washing of the step, the content of chloride ions in the raw materials can be effectively reduced, so that the proportion of the chloride ions combined into the crystal in the reaction process is reduced, and the washing difficulty is reduced;

step two: slurry mixing and washing of magnesium carbonate:

after the synthesis of magnesium carbonate is finished, carrying out solid-liquid separation, collecting filtrate, treating the filtrate by ion exchange resin, and washing again;

transferring the separated magnesium carbonate into a washing tank, adding a proper amount of water to mix slurry, and controlling the concentration of the slurry to be 5-50 g/L; starting the heating device, controlling the temperature of the slurry to be 40-90 ℃, starting the circulating device, circulating the slurry in the two washing tanks under the action of the circulating pump, adjusting the parameters of the circulating pump and a flow regulating valve, controlling the flow to be 5-10m for carrying out the cultivation/h, and keeping the second washing tank full of the slurry; opening an ultrasonic device in the second washing tank, and adjusting the ultrasonic frequency and the power to 60% -95% of the rated power; washing for 20-100 min;

step three: solid-liquid separation and drying:

and after washing is finished, carrying out solid-liquid separation on the slurry, drying the separated magnesium carbonate to obtain a product, and collecting filtrate to be used as water for size mixing in the synthesis reaction.

Further, the temperature of the water obtained by the solid-liquid separation in the second step is 40-90 ℃ after mixing.

As shown in fig. 1, the water-saving and efficient washing device for reducing the chloride content in magnesium carbonate comprises a first washing tank 1, a second washing tank 2, a stirring device 3, an ultrasonic device 4, a circulating pump 5, a return pipeline 6, a heating device 7 and a flow regulating valve 8; the right lower extreme of washing tank 1 passes through the pipeline to be connected with the upside of washing tank 2, and install circulating pump 5 on the pipeline, install agitating unit 3 in the washing tank 1, heating device 7, the bottom of washing tank 2 is passed through backflow pipeline 6 and is connected with the upside of washing tank 1, be equipped with flow control valve 8 on the backflow pipeline 6, the internally mounted of washing tank 2 has ultrasonic device 4, washing tank 1 links to each other with dewatering equipment 9, ion exchange equipment 10, collecting pit 11 in proper order, form the water circulation route.

In the embodiment, the temperature of the mixed water obtained in the step 2 after the solid-liquid separation is carried out twice is about 40-90 ℃, so that the solubility of chloride ions in water can be increased, the washing effect is improved, and the method is greatly helpful for washing chloride.

The washing tank related in the step 2 is divided into a large part and a small part, and stirring devices are arranged in the washing tank. The difference is that an ultrasonic device is arranged in the small tank of the washing tank II, and a circulating pump and a return pipe are arranged between the washing tank I and the washing tank II. And the magnesium carbonate and water are fully stirred and circularly enter a second washing tank with ultrasonic waves, the ultrasonic vibration causes the crystal structure of the magnesium carbonate to stretch or vibrate, and chloride ions can be fully contacted with the water and dissolved in the water, so that the washing effect is improved, and the chloride content is reduced.

In the step 2, in order to reduce the power of the ultrasonic equipment, partial serous fluid is subjected to ultrasonic washing in the second washing tank for multiple times, and the serous fluid is circulated and subjected to ultrasonic washing, so that the energy consumption is effectively reduced.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.