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Process for cleanly producing chromic anhydride crystal by sodium nitrate circulation method

A clean production, chromic anhydride technology, applied in the directions of chromium trioxide, chromium oxide/hydrate, etc., can solve the problems of serious environmental pollution, high production cost, low effective metal recovery rate, etc., and achieve lower reaction temperature and faster production speed. , the effect of increasing the sales price

Pending Publication Date: 2021-08-10
乔柏人
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  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is: change the defects such as high production cost, low effective metal recovery rate and serious environmental pollution in the production of chromic anhydride in the prior art, provide a kind of process method, solve the above-mentioned defects that the existing production process exists, Save energy and reduce consumption, reduce production cost, change production process, increase metal recovery rate, improve product quality, realize infinite recycling of sodium nitrate, no waste residue, no waste discharge, fundamentally solve technical problems that cause serious pollution to the environment, protect Ecological environment and human health, a process method for the clean production of chromic anhydride crystals using a sodium nitrate cycle method

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  • Process for cleanly producing chromic anhydride crystal by sodium nitrate circulation method
  • Process for cleanly producing chromic anhydride crystal by sodium nitrate circulation method
  • Process for cleanly producing chromic anhydride crystal by sodium nitrate circulation method

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Embodiment Construction

[0042] Accurately weigh (analytical pure calcium carbonate, content is 99.0%) CaCO3 43g, add 114ml of distilled water into the calcium carbonate at room temperature, after fully stirring, gradually add (analytical pure concentrated nitric acid, content is 65~68%) HNO3 57ml , The solution was reacted under stirring until clear and transparent. Then add (analytical pure sodium chromate, content is 99.0%) Na2CrO4 4H2O100g, in a water bath, under strong stirring, stir at 90°C for 40 minutes, then filter at 80°C, the filter is calcium chromate Crystals, the filtrate is sodium nitrate solution. After the sodium nitrate solution is concentrated and crystallized by evaporation (return to another sodium chromate making process for recycling).

[0043] Add 100ml of distilled water to the calcium chromate crystals obtained above, stir in a water bath at a constant temperature of 40°C for 10 minutes, then gradually add 60% dilute sulfuric acid (dilute sulfuric acid is prepared by 95-98% ...

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Abstract

The invention belongs to the field of chromium salt production, and particularly relates to a production process for producing crystal chromic anhydride and a byproduct calcium sulfate by taking sodium chromate as a raw material. The process comprises the following three stages: preparing a calcium chromate crystal, preparing a chromic acid solution and preparing a chromic anhydride crystal. The process produces crystalline chromic anhydride and by-product calcium sulfate from sodium chromate. And the product sodium nitrate after the reaction is returned to the system again for recycling. The complete process system for cleanly producing the chromic anhydride crystal by the sodium nitrate circulation method is formed. Energy consumption is reduced, production cost is reduced, production process is changed, metal recovery rate is increased, product quality is improved, infinite recycling of sodium nitrate is realized, no waste residue and no waste are discharged, the technical problem of serious pollution to the environment is fundamentally solved, energy is saved, consumption is reduced, and ecological environment and human health are protected.

Description

technical field [0001] The invention belongs to the field of chromium salt production, and in particular relates to a production process for producing crystalline chromic anhydride and by-product calcium sulfate by using sodium chromate as a raw material. Background technique [0002] Chromium salt: The chromium salt industry is one of the most competitive resource raw material industries in the world. The production of chromium salt is divided into four main products: sodium chromate, sodium dichromate, chromic anhydride and chrome green, while chromic anhydride is The most important central product among the four main products. [0003] Chromic anhydride: Chromium anhydride, chromium trioxide English name: Chromium trioxide; Chromic anhydride Molecular formula: CrO3 Molecular weight 99.99CAS NO: 1333-82-0UN NO: 1463 Dangerous goods number: 51519 Purple, flaky, soluble in water and ether . Chromium trioxide, also known as chromic anhydride, is a dark red orthorhombic crys...

Claims

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Application Information

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IPC IPC(8): C01G37/033
CPCC01G37/033
Inventor 乔柏人吴丽花李密成其他发明人请求不公开姓名
Owner 乔柏人
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