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Pure cryolite production technology without wastewater discharge

A production process, cryolite technology, applied in the production process field of pure cryolite without waste water discharge, to achieve the effect of saving consumption, less volatilization loss and stable electrolysis

Inactive Publication Date: 2018-12-11
衡东合兴化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both wet and dry synthetic cryolites have major defects. The intermediate material hydrogen fluoride gas is highly corrosive and toxic, which puts forward high requirements for the selection of production equipment and environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Pulping: Put 1.5t of alumina slag and water into the pulping tank and stir to make slurry;

[0023] 2. Reaction: Send the slurry prepared in step 1 to the reaction tank, pass steam into the reaction tank and heat to 80°C, add concentrated sulfuric acid and brine to keep the pH value of the reaction environment at 2.5, and stir the reaction to the end;

[0024] 3. Centrifugal separation: After the reaction, the material is subjected to centrifugal separation, and the crude cryolite and filtrate are separated.

[0025] 4. The crude cryolite separated in step 3 is mixed with water at a solid-to-liquid ratio of 1:10 to make slurry or added to the reactor, heated to 100°C, and the pH value of the solution is slowly adjusted to 8 with sodium carbonate solution, and the temperature of the stirrer is controlled. The speed is 500rpm, filter after 30 minutes of reaction time, wash the filter cake three times with sodium carbonate solution, mix the filter cake and water accordi...

Embodiment 2

[0030] 1. Pulping: Put 1.5t of alumina slag and water into the pulping tank and stir to make slurry;

[0031] 2. Reaction: Send the slurry prepared in step 1 to the reaction tank, pass steam into the reaction tank and heat to 80°C, add concentrated sulfuric acid and brine to keep the pH value of the reaction environment at 3, and stir the reaction to the end;

[0032] 3. Centrifugal separation: After the reaction, the material is subjected to centrifugal separation, and the crude cryolite and filtrate are separated.

[0033] 4. The crude cryolite separated in step 3 is mixed with water at a solid-to-liquid ratio of 1:20 to make slurry or added to the reactor, heated to 85°C, and the pH value of the solution is slowly adjusted to 8.5 with sodium carbonate solution, and the temperature of the stirrer is controlled. The speed is 650rpm, filter after 50 minutes of reaction time, wash the filter cake three times with sodium carbonate solution, mix the filter cake and water accordin...

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Abstract

The invention discloses a pure cryolite production technology without wastewater discharge. The technology comprises the following steps of (1) slurry production, (2) reaction, (3) entrifugal separation, (4) purification, (5) sedimentation, (6) alkalization and (7) wastewater treatment. The technology is simple, and a finished product cryolite has excellent performance; the cryolite produced through the pure cryolite production technology without wastewater discharge is electrolyzed smoothly, shrinkage is low, molecular ratio change is gentle, and the pure cryolite production technology without wastewater discharge is beneficial to stably maintaining an electrolyte component; a cathode absorbs sodium evenly, which is beneficial to prolonging the service life of an electrolytic cell; an electrolysis temperature is reasonable, little in change and easy to control; volatilization loss is little, and field operation conditions can be effectively improved; by means of the pure cryolite production technology without wastewater discharge, a large amount of sodium fluoride or sodium carbonate can be saved, the production cost is reduced, an adding method is used and is simple, and operation is easy; moreover, according to the pure cryolite production technology, no wastewater is discharged, and ammonium chloride is a by-product.

Description

technical field [0001] The invention relates to the technical field of mineral preparation, in particular to a production process for pure cryolite without waste water discharge. Background technique [0002] Cryolite, also known as sodium fluoroaluminate or sodium aluminum fluoride, is mainly used as a flux for aluminum electrolysis; it is also used as a wear-resistant additive for grinding products, which can effectively improve the wear resistance and cutting force of the grinding wheel, and prolong the service life and storage time of the grinding wheel ; Ferroalloy and boiling steel flux, non-ferrous metal flux, casting deoxidizer, olefin polymerization catalyst, and anti-reflective coating for glass, emulsifier for enamel, glass opalescent agent, flux for welding materials, ceramic industry Filling agents, pesticides, pesticides and other industries and enterprises. [0003] Natural cryolite reserves are very small, and most of the cryolite used are artificially synth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54C01C1/16
CPCC01C1/164C01F7/54
Inventor 赵鹏陈志平李亮
Owner 衡东合兴化工有限责任公司
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