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Method for directly producing anhydrous spherical calcium chloride from ammonia-soda process waste liquid

A technology of calcium chloride, ammonia alkali method, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problems of low production efficiency, complicated process, poor product quality, etc., and achieve production efficiency High, simple process, less equipment effect

Inactive Publication Date: 2008-02-20
唐山三友志达钙业有限公司
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Problems solved by technology

The traditional production method of anhydrous spherical calcium chloride is to use shell-and-tube evaporator and high-pressure steam to produce, which has complicated process, low production efficiency and poor product quality

Method used

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  • Method for directly producing anhydrous spherical calcium chloride from ammonia-soda process waste liquid

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Embodiment Construction

[0017] The present invention is described in detail below in conjunction with accompanying drawing and embodiment:

[0018] As shown, with CaCl 2 About 50% of the calcium liquid is sent from the evaporation workshop to the dissolution tank, and 0.5MPa steam is introduced to heat the calcium liquid to make the temperature of the calcium liquid reach above 120°C. The calcium powder returned by the vacuum system enters the dissolution tank and is dissolved and absorbed by the calcium liquid, so that Calcium solution is thickened to about 62%.

[0019] The above-mentioned concentrated calcium solution is pumped from the feeding liquid to the calcium solution filter for filtration, and then enters the fluidized bed granulator for spray granulation. The calcium liquid ejected from the nozzle of the granulator forms a mist. At this time, it must be dried with hot air to remove most of the water to obtain the finished spherical calcium with a content of ≥94.5%. The drying method is...

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Abstract

The invention relates to a production method of calcium chloride, in particular to a method to directly produce anhydrous spherical calcium chloride with ammonia-soda process waste liquid. The method is that: calcium liquid containing about 50 percent of CaCl2 is sent to a dissolving tank by an evaporating truck to absorb system calcium fly and heated directly by primary steam to obtain more concentrated calcium liquid; after being filtered, the concentrated calcium liquid enters a fluidized bed prilling machine to inject and granulate, then is heated by hot air, evaporated and dried to obtain calcium granules more than or equal to 94.5 percent and the superfluous calcium liquid goes back to the dissolving tank; the calcium granules from the fluidized bed enter a screening machine through a screw conveyor, a bucket elevator and a vibration feeder to be two-stage screened, qualified granules enter finished product silo, comparatively larger granules enter the vibration feeder, are crushed by a roll crusher and sent to the fluidized bed by the screw conveyor and the small granules screened directly enter the screw conveyor and go back to the fluidized bed. The invention has simple process, convenient operation, high production efficiency and good quality.

Description

Technical field: [0001] The invention relates to a production method of calcium chloride, in particular to a method for directly producing anhydrous spherical calcium chloride from ammonia-soda waste liquid by using a fluidized bed granulator. Background technique: [0002] At present, calcium chloride products have several specifications of dihydrate, anhydrous, 74% flakes and food grade, but dihydrate and anhydrous are the main products, and the products are mostly flakes or blocks. The output of spherical calcium chloride, especially anhydrous spherical calcium chloride is very small. The traditional production method of anhydrous spherical calcium chloride is to use shell-and-tube evaporator and high-pressure steam to produce, which has complicated process, low production efficiency and poor product quality. Invention content: [0003] The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a simple process, high productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/30
Inventor 李木臣李索海刘化升韩东利李全连张志坚王淑莉刘志文张永慧于鑫张翠玲高春喜安春江张志远
Owner 唐山三友志达钙业有限公司
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