Process method for reinforced alkali-united filtration

A process method and combined alkali technology are applied in the field of combined alkali enhanced filtration process, which can solve the problems of difficulty in producing high-quality products, low solid content of carbonized extraction liquid, and high free ammonia content, so as to improve production capacity and save raw material consumption. , the effect of simple process flow

Active Publication Date: 2012-07-25
GUANGDONG NANFANG SODA ASH IND
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Problems solved by technology

[0006] The production of soda ash by the combined soda method adopts the mother liquor circulation method. The mother liquor is used to produce ammonium chloride, and the ammonium mother liquor is recycled to make soda, so that the equivalent of the mother liquor is more than 50% higher than that of the ammonia-soda method, and the carbonized liquid has a low solid content. The content of free ammonia is high, the traditional filtration process and equipment have low efficiency and large washing water equivalent, making it difficult to produce high-quality products

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  • Process method for reinforced alkali-united filtration
  • Process method for reinforced alkali-united filtration

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Embodiment 1

[0032] Taking the 300,000 tons / year combined alkali plant as an example, the description is as follows:

[0033]The combined alkali carbonization extraction liquid (containing solid sodium bicarbonate 12-20%wt) is self-pressed into the alkali discharge tank with a curved screen, and the solid sodium bicarbonate crystal slurry is pre-concentrated through the alkali discharge tank, and the solid hydrogen carbonate on the solid-liquid side When the sodium content reaches 25-35%wt, it flows into the distribution box of the belt filter through the pipeline, and the liquid side flows into the mother liquid tank by itself. The pre-concentrated sodium bicarbonate crystal slurry is evenly distributed to the filter section of the belt filter through the distributor. The sodium bicarbonate slurry realizes solid-liquid separation by virtue of its own gravity and vacuum suction, and then enters the belt filter after forming a filter cake. washing section.

[0034] The washing of the filte...

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Abstract

The invention relates to a process method for reinforced alkali-united filtration. According to the process method, the operation of filtering sodium bicarbonate by applying a horizontal belt type vacuum filtering machine is taken as a basis, and the aim of obtaining a high-quality sodium bicarbonate product with the liquid content below 16 percent and the salt content below 0.2 percent under the condition of 80 percent of the water washing equivalent of a conventional process is realized by pre-concentrating in material feeding and pre-drying before material discharging. According to the process method for the reinforced alkali-united filtration, the research of the technological procedure and equipment is carried out aiming at the characteristic of an alkali-united process and the material property and the filtering performance of a filtering medium. According to the provided novel process method for the reinforced alkali-united filtration, high efficiency, low consumption and clean and civilized production are realized.

Description

technical field [0001] The invention belongs to the field of soda ash production, and relates to a process and equipment for a soda combined intensified filtration process. Background technique [0002] my country's soda ash production mainly adopts two production processes of "ammonia-soda method" and "combined soda method", and a small amount of trona is used as raw material for processing. Due to the advantages of high utilization rate of raw salt, less pollution, and low energy consumption, the combined soda process has developed rapidly in recent years, and the total production capacity of combined soda plants in my country has exceeded that of ammonia soda. [0003] Since the development of my country's soda ash industry, although its production capacity ranks first in the world, there is still a certain gap between the overall technical level and the world's advanced level. Optimizing process technology and upgrading equipment level have become one of the main ways fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00
Inventor 孟庆光杜爽
Owner GUANGDONG NANFANG SODA ASH IND
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