Novel process for preparing spherical calcium chloride with spray of rotary kiln

A calcium chloride, rotary kiln technology, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problems of waste of resources, pollution, flash evaporation, etc.

Active Publication Date: 2009-02-18
青海金锋实业有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

In high-altitude areas, due to the influence of high altitude and low air pressure, the maximum concentration of calcium chloride concentrate does not exceed 60%. If the concentration continues to increase, serious flash evaporation will occur. Therefore, it is impossible to use the traditional pelletizing process for production
[0008] In order to develop a circular economy and realize the strategic transfer of soda ash production capacity from east to west, Qinghai Province plans to build the largest soda ash production base in China and even Asia in the Qaidam area and has put it into practice. If a large amount of waste liquid cannot be recycled reasonably , the problem of resource waste and environmental pollution will be very serious

Method used

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  • Novel process for preparing spherical calcium chloride with spray of rotary kiln

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Example 1 produces 74% dihydrate spherical calcium chloride

[0026] Rotary kiln spray pelletizing key equipment such as figure 1 As shown, the feeding bin 1 at the head of the rotary kiln stores the returned material crystal seeds, and distributes the crystal seeds evenly into the kiln through the distribution plate 2 in front of the nozzle, and at the same time, the atomizing nozzle 3 sprays the concentrated calcium chloride solution to the crystal seed material curtain , the too fine seed crystals are brought into the cyclone separator from the outlet 4 by the induced wind, and the seed crystal dust that is not taken away by the induced wind is discharged from the discharge port 5 of the kiln head. Under the action of the material guide plate and the copy plate 6, Make the crystal seeds continuously adhere to the calcium chloride slurry and roll forward, and the spherical calcium chloride product obtained by drying the high-temperature air entering through the tuyere...

example 2

[0029] Example 2 Production of 95% Anhydrous Spherical Calcium Chloride

[0030] The pelletizing equipment and process flow are the same as in Example 1, and the control process parameters are: nozzle hydraulic pressure 0.4Mpa, air pressure 0.3Mpa, calcium chloride concentrated liquid temperature 150-160°C, return seed crystal 3.5-4.0t / h, particle size less than 1mm, Nozzle flow 8m 3 / h, adjust the high-temperature air intake and induced air volume, so that the intake temperature is between 400-420°C, the temperature of the rotary kiln head is 210-225°C, the rotary kiln speed is 8 rpm, and the pellets are sieved and cooled. Packaged as anhydrous calcium chloride product.

[0031] After testing, the calcium chloride content of the product is 95.2%, and the proportion of the ball diameter φ2.0-4.0mm is greater than 91%.

example 3

[0032] Example 3 is used for comparison. When the temperature of the calcium chloride concentrate is 130-135°C, the hydraulic pressure of the nozzle is 0.6Mpa, the air pressure is 0.45Mpa, the return material seed crystal is 5.5-6.0t / h, the seed crystal particle size is 0.5-2.0mm, and the nozzle flow rate is 11m 3 / h, adjust the high-temperature air intake and induced air volume, so that the intake temperature is 440-450°C, the hot air temperature at the kiln head is 220-240°C, and when the rotary kiln speed is 4 rpm, the content of spherical products can reach about 95%, but the spheroidization is not ideal, and the ratio of diameter φ2.0~5.0mm is about 75%.

[0033] When the temperature of the calcium chloride concentrate is 150-160°C, the hydraulic pressure of the nozzle is 0.4Mpa, the air pressure is 0.3Mpa, the return seed crystal is 3.5-4.0t / h, the particle size is less than 1mm, and the flow rate of the nozzle is 8m 3 / h, adjust the high-temperature air intake and indu...

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Abstract

The invention discloses a craftwork for producing the spherical calcium chloride with a rotary kiln in mist spraying way. Calcium chloride concentrated liquid is adopted as the raw material, and the pellet fabrication production is performed through an inoculating crystal in longitudinal mist spraying way in a rotary kiln. The calcium chloride concentrated liquid is atomized by a spraying nozzle at the kiln hood, and is sprayed towards the front inoculating crystal curtain; at the same time, under the effect of a mixing board, the calcium chloride and the particles of the inoculating crystal form multi-layer curtains at different positions inside the kiln, so that the calcium chloride pulp can be adequately conglutinated and forms the fluidization, and the pellet rolls forwards. Under the effect of the guiding plate and the mixing board of the rotary kiln, the atomized liquid drop is conglutinated and rolled with the inoculating crystal to become larger and larger; through the rapid contact between the high-temperature air and the inoculating crystal pellet, anhydrous spherical calcium chloride is formed on the surface of the inoculating crystal, and is discharged from the discharging port at the tail of the kiln, and is classified by a rolling sieve to get the qualified product. The invention realizes the one-step completion of the mist spraying pellet fabrication of the calcium chloride in the rotary kiln and the drying, and realizes the large-scale consecutive production of the spherical calcium chloride. The spherical degree, the surface smoothness and the strength of the prepared calcium chloride pellet are improved.

Description

technical field [0001] The invention belongs to the production process of calcium chloride, in particular to the process of producing spherical calcium chloride by spraying in a rotary kiln. Background technique [0002] Usually solid calcium chloride products have several forms such as powder, flake, block and ball: [0003] Powdered calcium chloride is prepared by spraying or rotary kiln drying. After the dust absorbs water, it is easy to adhere to the equipment, workshop and operators, so as to endanger the normal operation of the equipment and the health of the personnel. Moreover, the powdered calcium chloride has strong hygroscopicity, and it is easy to absorb the moisture in the air to agglomerate when used, and has Strong corrosive. [0004] Block calcium chloride is obtained by evaporating liquid calcium chloride, cooling and crystallizing, dehydrating and drying. The process is labor-intensive, the product recovery rate is low, the moisture content and impurity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/24
Inventor 邓良明王树轩李宁
Owner 青海金锋实业有限公司
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