CN111517341A - Water-saving and efficient washing method and device for reducing chloride content in magnesium carbonate - Google Patents

Abstract

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.

Description

Water-saving and efficient washing method and device for reducing chloride content in magnesium carbonate

technical field

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

Background technique

When chemically synthesizing magnesium carbonate, the raw materials used contain more or less impurity chloride ions, which has a great impact on the application of magnesium carbonate, and even limits the use in some cutting-edge precision industries. remove. At present, the method of water elution is mainly used, which has low efficiency, poor effect, and huge water consumption, resulting in waste of water resources.

SUMMARY OF THE INVENTION

In order to solve the technical problem that the existing method of using water elution is low in efficiency, not very good in effect, huge in water consumption, and causes waste of water resources; the object of the present invention is to provide a water-saving method that reduces chloride content in magnesium carbonate Efficient washing method and device.

The water-saving and efficient washing method that reduces chloride content in the magnesium carbonate of the present invention, its method is as follows:

Step 1: Sizing and washing of raw materials:

The raw materials for producing magnesium carbonate and water are slurried and mixed according to a certain proportion, the concentration is controlled to 5-50g/L, the heating device is turned on, the temperature of the slurry is controlled at 40-90°C, the stirring and circulation device is turned on, and the stirring is 30-150min; After the stirring, centrifugal dehydration or plate and frame filter press equipment is used to separate the slurry from solid and liquid; the separated semi-solid raw materials are transported to the synthesis reactor; the filtrate is collected and treated with ion exchange resin for washing again;

Step 2: Sizing and washing of magnesium carbonate:

After the synthesis of magnesium carbonate, solid-liquid separation is carried out, and the filtrate is collected and processed by ion exchange resin for washing again;

Transfer the separated magnesium carbonate to the washing tank, add an appropriate amount of water to adjust the slurry, and control the concentration of the slurry to be 5-50g/L; turn on the heating device, control the temperature of the slurry to be 40-90 °C, and open the circulation device. Then, make the slurry circulate in the two washing tanks, adjust the parameters of the circulating pump and the flow control valve, control the flow rate to 5-10m³/h, and keep the slurry full of the second washing tank; open the ultrasonic device in the second washing tank, adjust the ultrasonic frequency And the power reaches 60%-95% of the rated power; the washing ends after 20-100min;

Step 3: Solid-liquid separation and drying:

After washing, the slurry is subjected to solid-liquid separation, and the separated magnesium carbonate is dried to obtain a product; after the filtrate is collected, it is used as water for slurrying in the synthesis reaction.

Preferably, in the second step, the temperature of the water after the two solid-liquid separations is mixed is 40-90°C.

Preferably, the two washing tanks are one large and one small, and both have built-in stirring devices.

Preferably, an ultrasonic device is installed in the second washing tank, which meets the washing requirements with less equipment power and equipment investment.

A water-saving and efficient washing device for reducing chloride content in magnesium carbonate, comprising a washing tank 1, a washing tank 2, a stirring device, an ultrasonic device, a circulating pump, a return pipeline, a heating device, and a flow regulating valve; The lower end is connected with the upper side of the second washing tank through a pipeline, and a circulating pump 5 is installed on the pipeline. A stirring device and a heating device are installed in the first washing tank, and the bottom of the second washing tank is connected with the upper side of the washing tank 1 through a return pipeline. A flow regulating valve is arranged on the return pipeline, an ultrasonic device is installed inside the second washing tank, and the first washing tank is connected with the dehydration equipment, the ion exchange equipment and the collecting tank in sequence to form a water circulation path.

Compared with the prior art, the beneficial effects of the present invention are:

1. It can make chloride ions fully contact with water and dissolve in water to improve washing effect and reduce chloride content;

2. The slurry circulation is ultrasonically washed, which effectively reduces energy consumption and equipment investment;

3. Washing and production reaction operations can be combined into one, without increasing labor and production cycle, and high efficiency;

4. The sizing water and washing water are recycled and reused, which greatly reduces the consumption of production water, and at the same time, there is basically no waste water discharge, which protects the environment.

Description of drawings

For ease of description, the present invention is described in detail by the following specific implementations and 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-stirring device; 4-ultrasonic device; 5-circulating pump; 6-return pipeline; 7-heating device; 8-flow regulating valve; 9-dehydration equipment ; 10-ion exchange equipment; 11-collection pool.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described below through the specific embodiments shown in the accompanying drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present invention.

Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the structures and/or processing steps closely related to the solution according to the present invention are shown in the drawings, and the related structures and/or processing steps are omitted. Other details not relevant to the invention.

As shown in Figure 1, this specific embodiment adopts the following technical solutions: its washing method is as follows:

Step 1: Sizing and washing of raw materials:

The raw materials for producing magnesium carbonate and water are slurried and mixed according to a certain proportion, the concentration is controlled to 5-50g/L, the heating device is turned on, the temperature of the slurry is controlled at 40-90°C, the stirring and circulation device is turned on, and the stirring is 30-150min; After stirring, use centrifugal dehydration or plate and frame filter press equipment to separate the slurry from solid and liquid; the separated semi-solid raw materials are transported to the synthesis reactor; after the filtrate is collected, it is treated with ion exchange resin for washing again. ;

In this step of washing, the chloride ion content in the raw material can be effectively reduced, thereby reducing the proportion of chloride ions bound to the crystal during the reaction process, and reducing the difficulty of washing;

Step 2: Sizing and washing of magnesium carbonate:

After the synthesis of magnesium carbonate, solid-liquid separation is carried out, and the filtrate is collected and processed by ion exchange resin for washing again;

Transfer the separated magnesium carbonate to the washing tank, add an appropriate amount of water to adjust the slurry, and control the concentration of the slurry to be 5-50g/L; turn on the heating device, control the temperature of the slurry to be 40-90 °C, and open the circulation device. Then, make the slurry circulate in the two washing tanks, adjust the parameters of the circulating pump and the flow control valve, control the flow rate to 5-10m³/h, and keep the slurry full of the second washing tank; open the ultrasonic device in the second washing tank, adjust the ultrasonic frequency And the power reaches 60%-95% of the rated power; the washing ends after 20-100min;

Step 3: Solid-liquid separation and drying:

After washing, the slurry is subjected to solid-liquid separation, and the separated magnesium carbonate is dried to obtain a product. After the filtrate is collected, it is used as water for slurrying in the synthesis reaction.

Further, in the second step, the temperature of the water after the two solid-liquid separations is mixed is 40-90°C.

As shown in Figure 1, the water-saving and efficient washing device for reducing chloride content in magnesium carbonate includes washing tank 1 1, washing tank 2 2, stirring device 3, ultrasonic device 4, circulating pump 5, return pipeline 6, heating device 7. Flow regulating valve 8; the lower right end of washing tank one 1 is connected to the upper side of washing tank two 2 through a pipeline, and a circulating pump 5 is installed on the pipeline, and a stirring device 3 and a heating device 7 are installed in washing tank one 1, The bottom of the washing tank two 2 is connected with the upper side of the washing tank one 1 through the return pipe 6, the return pipe 6 is provided with a flow regulating valve 8, and an ultrasonic device 4 is installed inside the washing tank two 2. The equipment 9, the ion exchange equipment 10, and the collection tank 11 are connected to form a water circulation path.

In this specific embodiment, the temperature of the water after the two solid-liquid separations in the second step is about 40-90 ° C. The temperature of the matter can increase the solubility of chloride ions in water and improve the washing effect, which is beneficial to chloride washing. Great help.

The washing tank involved in the second step is divided into two parts, one large and one small, and both have built-in stirring devices. The difference is that an ultrasonic device is arranged in the second small tank of the washing tank, and a circulating pump and a return pipe are arranged between the first washing tank and the second washing tank. Magnesium carbonate and water are fully stirred and circulated into the second washing tank with ultrasonic. Ultrasonic vibration makes the crystal structure of magnesium carbonate stretch or vibrate, and chloride ions can fully contact with water and dissolve in water to improve washing effect and reduce chloride. content.

In the second step, in order to reduce the power of the ultrasonic equipment, part of the slurry is ultrasonically washed in batches in the second washing tank, and the slurry is circulated through ultrasonic cleaning, which effectively reduces the energy consumption.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (4)

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.

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