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Process for preparing cryolite by using HF (hydrogen fluoride) waste liquid and cryolite prepared through process

A technology of cryolite and waste liquid, which is applied in the direction of aluminum fluoride and aluminum halide, can solve the problems of increasing environmental pollution load, secondary pollution, waste sludge, etc., and achieves easy operation and realization, high safety factor and low energy consumption low effect

Inactive Publication Date: 2018-02-23
达州励志环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to treat waste HF wastewater with calcium chloride. Although this method can remove F- in wastewater, it produces a large amount of waste sludge, increases environmental pollution load, and produces secondary pollution.

Method used

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  • Process for preparing cryolite by using HF (hydrogen fluoride) waste liquid and cryolite prepared through process
  • Process for preparing cryolite by using HF (hydrogen fluoride) waste liquid and cryolite prepared through process
  • Process for preparing cryolite by using HF (hydrogen fluoride) waste liquid and cryolite prepared through process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of technology that utilizes HF waste liquid to prepare cryolite, described preparation technology comprises the steps:

[0039] Step 1, taking liquid: take HF waste liquid and send it to a first-class reaction kettle resistant to acid and alkali corrosion;

[0040] Step 2, adjust the pH: add alkali to the HF waste liquid in the liquid taken in step 1, and adjust the pH of the mixed liquid to 8;

[0041] Step 3, one-time stirring: the mixed solution obtained by adjusting the pH value in step 2 was stirred at room temperature for 0.5 hours;

[0042] Step 4, primary filtration: the mixed solution obtained by stirring in step 3 is sent to a filter for filtration, the filter cake is discarded, and the filtrate is retained for subsequent use;

[0043] Step 5, feeding: first detect the concentration of F in the filtrate obtained by filtering for the first time in step 4, then add aluminum salt and sodium salt in the filtrate, and control the molecular ratio of F-, alum...

Embodiment 2

[0066] A kind of technology that utilizes HF waste liquid to prepare cryolite, described preparation technology comprises the steps:

[0067] Step 1, taking liquid: take HF waste liquid and send it to a first-class reaction kettle resistant to acid and alkali corrosion;

[0068] Step 2, adjust the pH: add alkali to the HF waste liquid in the liquid taken in step 1, and adjust the pH of the mixed liquid to 9;

[0069] Step 3, one-time stirring: the mixed solution obtained by adjusting the pH value in step 2 was stirred at room temperature for 3 hours;

[0070] Step 4, primary filtration: the mixed solution obtained by stirring in step 3 is sent to a filter for filtration, the filter cake is discarded, and the filtrate is retained for subsequent use;

[0071] Step 5, feeding: first detect the concentration of F in the filtrate obtained by filtering for the first time in step 4, then add aluminum salt and sodium salt in the filtrate, and control the molecular ratio of F-, alumin...

Embodiment 3

[0094] A kind of technology that utilizes HF waste liquid to prepare cryolite, described preparation technology comprises the steps:

[0095] Step 1, taking liquid: take HF waste liquid and send it to a first-class reaction kettle resistant to acid and alkali corrosion;

[0096] Step 2, adjust the pH: add alkali to the HF waste liquid in the liquid taken in step 1, and adjust the pH of the mixed liquid to 10;

[0097] Step 3, one-time stirring: the mixed solution obtained by adjusting the pH value in step 2 was stirred at room temperature for 6 hours;

[0098] Step 4, primary filtration: the mixed solution obtained by stirring in step 3 is sent to a filter for filtration, the filter cake is discarded, and the filtrate is retained for subsequent use;

[0099] Step 5, feeding: first detect the concentration of F in the filtrate obtained by filtering for the first time in step 4, then add aluminum salt and sodium salt in the filtrate, and control the molecular ratio of F-, alumi...

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Abstract

The invention discloses a process for preparing cryolite by using HF (hydrogen fluoride) waste liquid and cryolite prepared through the process. By the process, the cryolite is prepared by a series ofprocedures including liquid selection, adjustment of acidity and alkalinity, preliminary stirring, preliminary filtering, material adding, secondary stirring, secondary filtering, washing, and drying. The process is simple and convenient to operate and realize; furthermore, process parameters of each step are simple; by integration of physical and chemical treatment processes, the process is highin operability; the whole process is higher in operability, higher in safety coefficient and lower in energy consumption; the prepared cryolite can meet the quality standard; furthermore, a feasiblemeasure is provided for treatment of HF waste liquid, so that aims of treating wastes by wastes and turning wastes into treasures are fulfilled; the waste HF does not generate waste CaF2 anymore, andthe aims of industrial discharge reduction, resource recycling, green technology and reclamation of the wastes are completely fulfilled; the process has very important economical and social benefits.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a process for preparing cryolite, in particular to a process for preparing cryolite by using HF waste liquid and the prepared cryolite. Background technique [0002] The main cryolite cryolite is also known as sodium hexafluoroaluminate or sodium aluminum fluoride, the molecular formula is Na3AlF6, white fine crystals, odorless, the solubility is larger than natural cryolite, the specific gravity is 3, the hardness is 2-3, the melting point is easy Absorbs moisture. Cryolite is a very important chemical raw material. It is mainly used as a flux for aluminum electrolysis, a wear-resistant filler for rubber and grinding wheels, an enamel opalescent agent, a glass sunscreen and a metal flux, and an insecticide for crops. Cryolite is used in the largest amount in the aluminum industry. The annual consumption in the world is about 700,000 tons. In 1999, the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54
CPCC01F7/54C01P2006/80C01P2006/82
Inventor 刘泽君
Owner 达州励志环保科技有限公司
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