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Control method for continuous crystal granularity of sodium thiosulfate pentahydrate

A technology of sodium thiosulfate pentahydrate and crystal particle size, applied in the direction of thiosulfate/dithionite/polythionate, etc., can solve the problem of excessively fast generation of fine crystals of sodium thiosulfate pentahydrate and product particle size. Small problems, to achieve the effect of simple structure, ensuring normal operation, and accurate sampling position

Active Publication Date: 2015-05-13
锦州钒业有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for controlling the continuous crystallization size of sodium thiosulfate pentahydrate, which solves the problem that the fine crystals of sodium thiosulfate pentahydrate produced by Oslo continuous crystallizer are produced too quickly and the particle size of the product is small, and can effectively guarantee the Oslo crystallizer Continuous and stable operation to ensure that the particle size of the product is 2mm to 3mm above 95%, and the product quality is stable

Method used

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  • Control method for continuous crystal granularity of sodium thiosulfate pentahydrate
  • Control method for continuous crystal granularity of sodium thiosulfate pentahydrate
  • Control method for continuous crystal granularity of sodium thiosulfate pentahydrate

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Embodiment 1

[0030] Such as figure 1 As shown, the continuous crystallization sampler of sodium thiosulfate pentahydrate comprises a storage cylinder 6, and the volume of the storage cylinder 6 is 1L; The feed port II2, the diameter of the feed port I1 and the feed port II2 is 80 mm, and the movable rod 3 that penetrates up and down and passes through the feed port I1 and the feed port II2 is provided in the storage cylinder 6. The movable rod 3 is located at the lower edge of the feed port I1 and the feed port II2 and is provided with a closing baffle 5 that can close the feed port I1 and the feed port II2. The rope 4 is connected with a lifting rope 7 on the movable rod 3 . Throughout the sampling process, the sampling position is the middle position of the suspension section, the transition section and the clear liquid section. When sampling, fix the lifting rope 4, pull the movable rod 3 upwards, and make the upper and lower two closed baffles 5 close the feed inlet I1 and feed inlet...

Embodiment 2

[0037] Such as figure 1 As shown, the continuous crystallization sampler of sodium thiosulfate pentahydrate comprises a storage cylinder 6, and the volume of the storage cylinder 6 is 1L; The feed port II2, the diameter of the feed port I1 and the feed port II2 is 90mm, and the movable rod 3 that penetrates up and down and passes through the feed port I1 and the feed port II2 is provided in the storage cylinder 6. The movable rod 3 is located at the lower edge of the feed port I1 and the feed port II2 and is provided with a closing baffle 5 that can close the feed port I1 and the feed port II2. The rope 4 is connected with a lifting rope 7 on the movable rod 3 . Throughout the sampling process, the sampling position is the middle position of the suspension section, the transition section and the clear liquid section. When sampling, fix the lifting rope 4, pull the movable rod 3 upwards, and make the upper and lower two closed baffles 5 close the feed inlet I1 and feed inlet ...

Embodiment 3

[0044] Such as figure 1 As shown, the continuous crystallization sampler of sodium thiosulfate pentahydrate comprises a storage cylinder 6, and the volume of the storage cylinder 6 is 1L; The feed port II2, the diameter of the feed port I1 and the feed port II2 is 85mm, and the movable rod 3 that penetrates up and down and passes through the feed port I1 and the feed port II2 is provided in the storage cylinder 6. The movable rod 3 is located at the lower edge of the feed port I1 and the feed port II2 and is provided with a closing baffle 5 that can close the feed port I1 and the feed port II2. The rope 4 is connected with a lifting rope 7 on the movable rod 3 . Throughout the sampling process, the sampling position is the middle position of the suspension section, the transition section and the clear liquid section. When sampling, fix the lifting rope 4, pull the movable rod 3 upwards, and make the upper and lower two closed baffles 5 close the feed inlet I1 and feed inlet ...

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Abstract

The invention discloses a control method for continuous crystal granularity of sodium thiosulfate pentahydrate. The method comprises the following steps: crystallizing sodium thiosulfate pentahydrate by virtue of an Oslo continuous crystallizer, breeding seed crystal, emptying, and then respectively sampling 1,000mL by virtue of a sampler at a suspending section, a transition section and a clear liquid section of the Oslo continuous crystallizer every two hours; respectively filtering to obtain crystal and mother liquor; returning the mother liquor to the crystallizer; detecting the granularity of the sampled crystal when the total mass of singly sampled crystal at the suspending section, the transition section and the clear liquid section is 900-1300g; and carrying out emptying or grain crystal refining treatment according to the granularity of the crystal at the suspending section, the transition section and the clear liquid section. The control method has the advantages that lasting and stable operation of the Oslo crystallizer can be effectively ensured; the content of the product of which the granularity is 2-3mm is 95% or above; and the product quality is stable.

Description

technical field [0001] The invention relates to the field of crystallization production of sodium thiosulfate pentahydrate, in particular to a particle size control method for continuous crystallization of sodium thiosulfate pentahydrate by using an Oslo crystallizer. Background technique [0002] Sodium thiosulfate pentahydrate is an important chemical product, which is widely used in the fields of leather industry, textile, medical treatment, pesticide, laboratory silver extraction and cement. Sodium thiosulfate pentahydrate is used as a chlorine remover in the textile industry to remove residual chlorine in fabrics after bleaching; it is also an important raw material for the production of low-toxicity and high-efficiency pesticides; it can also be used as a fixer for photography. Sodium thiosulfate pentahydrate has a small particle size and a large amount of adsorption of mother liquor, resulting in low purity, and it is easy to weather and agglomerate. Studies have sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/64
CPCC01B17/64
Inventor 齐牧崔传海郭树志金绍祥张玉驰金梅王丽曹建中于小川刘亚凤郭密云赵秀媛刘红康春生贾伟王博阳王立业王玉珏孙萍
Owner 锦州钒业有限责任公司
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