CN114288922A - Calcium magnesium salt recovery system - Google Patents

Abstract

The invention relates to the technical field of combined alkali production equipment, in particular to a calcium-magnesium salt recovery system. The scale inhibitor feeding device comprises a scale inhibitor adding pipe, a supercharger, a discharging device, a stirrer, a feeder, a drying furnace and a recoverer, wherein the scale inhibitor adding pipe and the supercharger are respectively connected with the discharging device, the stirrer is connected with the discharging device, the stirrer and the drying furnace are respectively connected with the feeder, and the recoverer is connected with the drying furnace.

Description

Calcium magnesium salt recovery system

Technical Field

The invention relates to the technical field of combined alkali production equipment, in particular to a calcium-magnesium salt recovery system.

Background

Ca and Mg are deposited and attached to the inner walls of equipment and pipelines in the forms of CaCO3 and MgCO3 in a mother liquor system for a long time in the combined alkali production, so that the drift diameter of the pipelines is reduced, and the normal conveying capacity and cold recovery of the mother liquor are influenced. The mother liquor conveying (circulating amount) is limited every year, and the system is forced to reduce the load or stop the production, so that the long-period stable operation of the production is restricted. Therefore, the HJW-105 soda ash mother liquor antisludging agent is added into a mother liquor system to change the precipitation mode of Ca and Mg, and in the prior art, the adhesion of CaCO3, CaSO4, Mg (OH)2 and the like on the inner walls of equipment and pipelines is reduced as much as possible, so that the scaling of the inner walls of the mother liquor pipelines is eliminated or reduced, and the long-period stable operation of production is promoted.

Therefore, it is urgently needed to research and develop a device for ensuring the stable operation of the drying furnace to solve the problem of the distribution of the wet calcium and magnesium in the fluidized bed.

Disclosure of Invention

The invention aims to provide a calcium-magnesium salt recovery system aiming at the problems in the prior art, which is designed based on the existing combined alkali production process equipment, realizes the high-efficiency recovery of calcium-magnesium salt, and avoids the problems of caking, bed sitting, bed death and the like caused by the calcium-magnesium salt piled on a fluidized bed, thereby greatly prolonging the operation period of a drying furnace, reducing the operation difficulty and reducing the economic cost.

The technical scheme for solving the problems is as follows: the calcium-magnesium salt recovery system comprises a scale inhibitor adding pipe, a supercharger, a discharging device, a stirrer, a feeder, a drying furnace and a recoverer, wherein the scale inhibitor adding pipe and the supercharger are respectively connected with the discharging device, the stirrer is connected with the discharging device, the stirrer and the drying furnace are respectively connected with the feeder, and the recoverer is connected with the drying furnace.

Further, in the calcium magnesium salt recovery system, the blanking device is a centrifuge.

Further, in the calcium-magnesium salt recovery system, a motor, a main shaft and blades are arranged on the stirrer, the main shaft is driven by the motor, a plurality of groups of blades are arranged, and the blades are arranged around the main shaft.

Further, in the calcium magnesium salt recovery system, the feeder is a device which feeds materials in a throwing mode.

Further, in the calcium magnesium salt recovery system, the drying furnace comprises a furnace body, and a feeding hole and a discharging hole which are arranged on the furnace body, and the furnace body is oval.

Further, in the calcium magnesium salt recovery system, a stirrer is arranged at the feed inlet of the drying furnace.

Further, in the calcium-magnesium salt recovery system of the invention, a bed height adjusting valve is arranged at the discharge port of the drying furnace.

Further, in the calcium magnesium salt recovery system of the invention, the stirrer is used for crushing and stirring wet calcium magnesium materials.

Further, in the calcium-magnesium salt recovery system, the recoverer comprises a plurality of sets of cyclone dust collectors and a dust collecting device which are connected, and each set of the cyclone dust collectors is respectively connected with the drying furnace.

Further, in the calcium magnesium salt recovery system, the scale inhibitor adding pipe and the supercharger are opened and closed simultaneously, and the scale inhibitor adding pipe is added with an anti-caking agent in an instrument gas distribution mode.

Compared with the prior art, the invention has the beneficial effects that: make full use of has the existing antithetical couplet alkali production facility to carry out the innovative design, effectively solve wet calcium magnesium and get into the problem that the cloth inequality caused the fluidized bed operating cycle to be short and often scab after the fluidized bed, realize the high-efficient recovery of calcium magnesium salt, avoid calcium magnesium salt pile to cause caking, sit bed and dead bed scheduling problem to take place on the fluidized bed to prolong the operating cycle of drying furnace by a wide margin, reduce the operation degree of difficulty, and then reduce economic cost by a wide margin, increase economic benefits, be fit for the industrialization popularization and application.

Drawings

FIG. 1 is a schematic structural diagram of the calcium-magnesium salt recovery system of the invention.

Detailed Description

The present invention will be described in detail with reference to the drawings and examples, but the present invention is not limited to the examples.

As shown in fig. 1, the calcium-magnesium salt recovery system comprises a scale inhibitor adding pipe, a supercharger, a discharging device, a stirrer, a feeder, a drying furnace and a recoverer, wherein the scale inhibitor adding pipe and the supercharger are respectively connected with the discharging device, the stirrer is connected with the discharging device, the stirrer and the drying furnace are respectively connected with the feeder, and the recoverer is connected with the drying furnace.

In the above embodiment, to reduce the water content in the wet calcium and magnesium discharging, the discharging device is preferably a centrifuge. In order to timely and fully mix the anti-blocking agent and the wet calcium and magnesium, preferably, the scale inhibitor adding pipe and the supercharger are opened and closed simultaneously, and the anti-blocking agent is added in the scale inhibitor adding pipe in an instrument gas distribution mode. In order to ensure that the granularity of raw materials meets the requirement of the production of the combined alkali and promote the uniform progress of related reactions, thereby providing guarantee for the product quality, further crushing and stirring the wet calcium and magnesium with the anti-caking agent, wherein the wet calcium and magnesium is stirred by the stirrer, namely the stirrer is used for crushing and stirring the wet calcium and magnesium materials, the stirrer is preferably provided with a motor, a main shaft and blades, the main shaft is driven by the motor, the blades are arranged around the main shaft, when the stirrer runs, the main shaft is driven by the motor, thereby driving the blades to rotate at high speed, when the wet calcium and magnesium materials enter the stirrer, the wet calcium and magnesium tightly rubs and strongly impacts the blades in the rotating airflow, the wet calcium and magnesium is fully crushed and stirred, thereby effectively changing the granularity of the wet calcium and magnesium, and the granularity of the wet calcium and magnesium materials crushed by the stirrer can be 1 mm-4 mm, the particle size of the wet calcium-magnesium material crushed by the stirrer can reach 1 mm-3 mm by adjusting the rotating speed of the motor. In order to effectively avoid the occurrence of agglomeration on the fluidized bed and the occurrence of bed setting and the like caused by agglomeration, the feeder is preferably a device adopting a throwing mode for feeding. The drying furnace comprises a furnace body, and a feeding hole and a discharging hole which are arranged on the furnace body, wherein the furnace body is preferably elliptical so as to reduce heat loss and improve heat efficiency, thereby improving the efficiency of dry calcium and magnesium; preferably, a stirrer is arranged at a feed inlet of the drying furnace, and is used for stirring the wet calcium and magnesium materials entering the fluidized bed, so that further guarantee is provided for avoiding caking, bed sitting and bed death; preferably, a bed height adjusting valve is arranged at the discharge port of the drying furnace, so that the bed maintains a better height, and the operation efficiency is improved. In order to enhance the environmental protection effect, the dust generated in the process of drying calcium and magnesium is effectively treated, preferably, the recoverer comprises a plurality of groups of cyclone dust collectors and a dust collecting device which are connected, and each group of cyclone dust collectors are respectively connected with the drying furnace.

The calcium-magnesium salt recovery system can provide a better calcium-magnesium salt raw material for the combined alkali production, and specifically, when the blanking device carries out wet calcium-magnesium blanking, an anti-blocking agent is added through the scale inhibitor adding pipe, and when the anti-blocking agent is added, the supercharger is used for carrying out air pressurization, so that the anti-blocking agent is uniformly sprayed on the surface of wet calcium-magnesium in an atomized form, and partial caking of the wet calcium-magnesium caused by nonuniform addition of the anti-blocking agent is prevented; breaking the pseudo-caked wet calcium and magnesium in the blanking device by the stirrer to increase the contact area, and uniformly stirring the wet calcium and magnesium added with the anti-caking agent, thereby ensuring that the granularity of the wet calcium and magnesium is between 1 and 3mm when entering the fluidized bed; the crushed wet calcium and magnesium enters the drying furnace through the feeder in a throwing mode, and the throwing mode can effectively ensure the uniform distribution effect of the wet calcium and magnesium entering the fluidized bed after entering the furnace, so that the running period of the fluidized bed is increased, and the dead bed of the fluidized bed caused by uneven feeding of the wet calcium and magnesium is effectively avoided; the wet calcium and magnesium after entering the furnace are recovered in the fluidized bed drying furnace, and the dust generated in the recovery process is treated by the recoverer, so that the environmental protection is guaranteed. In the specific application of the invention, the moisture content of the involved wet calcium and magnesium, the addition amount of the anti-caking agent, the proportion of the anti-caking agent to the dilution water and the like are determined according to specific working conditions, preferably, the addition amount of the anti-caking agent is 0.2-0.4 kg per ton of calcium and magnesium, and the proportion of the anti-caking agent to the dilution water is 1: 3-1: 6, the moisture content of the wet calcium and magnesium is 5-8%.

Generally, the moisture contained in the wet calcium and magnesium is mainly the moisture on the surface of the wet calcium and magnesium particles and the capillary moisture existing between the particles, and the moisture is non-binding water, so that in the process of recovering the non-binding water on the surface of the wet calcium and magnesium material, the vapor pressure on the surface of the wet calcium and magnesium is equal to the vapor pressure of water at the same temperature, the recovery speed is controlled by the surface vaporization speed of the water, the particle size of the wet calcium and magnesium is changed, the surface area of the wet calcium and magnesium is increased, the moisture evaporation is facilitated, and the production capacity of a drying furnace is further increased. The invention changes the particle size of the wet calcium and magnesium, adjusts the feeding mode of the wet calcium and magnesium, and enhances the air distribution effect of the fluidized bed of the drying furnace, thereby effectively solving the problems that wet calcium and magnesium blocks are difficult to disperse after entering the drying furnace and are unevenly distributed in the fluidized bed to generate caking, bed sitting, dead bed and the like, further solving the problems of short operation period and high operation strength of the drying furnace, ensuring the stable operation of the drying furnace, and greatly reducing the economic cost; meanwhile, a better calcium magnesium salt raw material is provided for the combined alkali production, the quality of the product produced by the combined alkali is guaranteed, the economic benefit is increased, and the method is suitable for industrial popularization and application.

The invention is not limited to the above-described embodiments, and any obvious modifications or alterations to the above-described embodiments may be made by those skilled in the art without departing from the spirit of the invention and the scope of the appended claims.

Claims (10)

1. The calcium-magnesium salt recovery system is characterized by comprising a scale inhibitor adding pipe, a supercharger, a discharging device, a stirrer, a feeder, a drying furnace and a recoverer, wherein the scale inhibitor adding pipe and the supercharger are respectively connected with the discharging device, the stirrer is connected with the discharging device, the stirrer and the drying furnace are respectively connected with the feeder, and the recoverer is connected with the drying furnace.

2. The calcium-magnesium salt recovery system of claim 1, wherein the blanking device is a centrifuge.

3. The calcium magnesium salt recovery system of claim 1, wherein the mixer is provided with a motor, a main shaft driven by the motor, and a plurality of blades arranged around the main shaft.

4. The calcium magnesium salt recovery system of claim 1 wherein the feeder is a device that feeds the calcium magnesium salt by a throw-away method.

5. The calcium-magnesium salt recovery system of claim 1, wherein the drying furnace comprises a furnace body, and a feed inlet and a discharge outlet arranged on the furnace body, and the furnace body is oval.

6. The calcium-magnesium salt recovery system according to claim 1, wherein an agitator is provided at a feed inlet of the drying furnace.

7. The calcium-magnesium salt recovery system according to claim 1, wherein a bed height adjusting valve is provided at a discharge port of the drying furnace.

8. The calcium-magnesium salt recovery system of claim 1, wherein the blender is used to break and blend the wet calcium-magnesium material in the calcium-magnesium salt recovery system.

9. The calcium and magnesium salt recovery system of claim 1, wherein the recovery device comprises a plurality of sets of connected cyclones and a dust collecting device, and each set of cyclones is connected to the drying furnace.

10. The calcium and magnesium salt recovery system of claim 1, wherein the scale inhibitor adding pipe and the pressure booster are opened and closed simultaneously, and the scale inhibitor adding pipe adds an anti-caking agent in an instrument gas distribution manner.

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