IV-effect evaporation process of sodium bichromate
A technology of four-effect evaporation and sodium alumite, applied in the field of four-effect evaporation of sodium alumite, can solve problems such as damage to equipment, affecting the production of sodium alumite, and achieve the effect of increasing the evaporation area
Inactive Publication Date: 2011-09-21
CHONGQING MINFENG CHEM
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Problems solved by technology
At present, the production methods of sodium dichromate in my country mainly include sulfuric acid method, electrolysis method and carbonization method. The sulfuric acid method is the most commonly used method. It is used for heating in the next effect, but the disadvantage of the sulfuric acid method is that it will produce Glauber’s salt (Na2SO4) during the evaporation process, and Glauber’s salt will form a wall in the evaporation chamber to form Glauber’s salt scale, which will affect the production of red alum and sodium and damage the equipment. How to quickly eliminate crystallization and become chromium salt The difficulty of evaporating
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[0026] Such as figure 1 As shown, a four-effect evaporation process of red alum sodium adopts a four-effect arrangement of evaporators, and the four-effect evaporator includes I-effect evaporators (I-effect heaters, I-effect separators, I-effect discharge materials) connected in sequence through pipelines. pump), Ⅱ effect evaporator (Ⅱ effect heater, Ⅱ effect separator, Ⅱ effect discharge pump), Ⅲ effect evaporator (Ⅲ effect heater, Ⅲ effect separator, Ⅲ effect discharge pump), Ⅳ effect evaporation Device (IV effect heater, IV effect separator, IV effect discharge pump);
[0027] The material flow is as follows: the red alum sodium acidification completion liquid (≤35°Be′) transported from the acidification station into the evaporation supply tank is pumped into the III-effect evaporator through the evaporation feed pump, and heated in the III-effect heater. Evaporate in the evaporation chamber, and the material is forced to circulate through the heating chamber into the thir...
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The invention discloses an IV-effect evaporation process of sodium bichromate, belonging to the field of industrial production of inorganic salts. A feed solution enters an III-effect evaporator first and then sequentially enters an II-effect evaporator, an I-effect evaporator and an IV-effect evaporator; forced circular evaporation is carried out in all the evaporators; a concentrated mother solution is obtained by evaporating for multiple times; a tangential feeding mode is adopted by each evaporator for feeding; the steam flow is the I-effect evaporator, the II-effect evaporator, the III-effect evaporator and the IV-effect evaporator, wherein fresh steam is used for the I-effect evaporator; other evaporators take secondary steam generated by the previous effect evaporator as a heat source; sodium sulfate crystals generated in the I-effect evaporator, the II-effect evaporator, the III-effect evaporator and the IV-effect evaporator are collected by salt legs arranged in the evaporators. In the IV-effect evaporation process, the deposited sodium sulfate scale is collected by the salt legs; and the evaporating efficiency is improved by adopting the tangential feeding mode.
Description
[0001] technical field [0002] The invention belongs to a four-effect evaporation process of red alum sodium and belongs to the field of industrial production of inorganic salts. Background technique [0003] Sodium dichromate (Na2Cr2O7.2H2O), also known as sodium dichromate, is the basic raw material for the production of chromium salt products such as potassium dichromate, chromic anhydride, and chrome green. It is an important inorganic chemical raw material and is widely used in electroplating, tanning, printing and dyeing, Medicine, oil refining, catalyst, synthetic rubber, spices and stainless steel manufacturing industries, with the development of my country and the world economy, its demand has increased greatly. At present, the production methods of sodium dichromate in my country mainly include sulfuric acid method, electrolysis method and carbonization method. The sulfuric acid method is the most commonly used method. It is used for heating in the next effect, b...
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Inventor 袁代建江泽银王成业
Owner CHONGQING MINFENG CHEM