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Preparation method of calcium chloride solution for fluorite mine beneficiation wastewater treatment

A technology for calcium chloride solution and beneficiation wastewater, applied in mining wastewater treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as high freight, low lime solubility, cumbersome process, etc., and reduce production The effect of cost, simplification of conventional preparation process and simplification of treatment process

Inactive Publication Date: 2019-05-10
FENY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the removal of the above two substances, the chemical precipitation method is currently the most widely used method, that is, on the basis of the lime method or calcium chloride method, and the inorganic flocculant is used to remove the above substances, but the lime method has the following disadvantages : (1) The operating environment of the lime method is poor, the equipment is severely corroded, and it is easy to scale, and the subsequent wastewater treatment needs to be neutralized with a large amount of acid; (2) The solubility of lime in water is small, so it can only be added as an emulsion to remove fluorine process, due to the generation of CaF 2 Encased in Ca(OH) 2 Particle surface, so that it can not be fully utilized, so the dosage is increased
In the preparation method of calcium chloride solution in the prior art, the mass concentration of the prepared calcium chloride solution is not high, and most of them include the process flow of impurity removal and ammonia distillation, the process is cumbersome and the energy consumption is high
If a fluorite mine wastewater treatment enterprise purchases this kind of calcium chloride solution with a low quality concentration, it needs to bear more freight than calcium chloride dihydrate, so it is not economical. In addition, the existing prepared calcium chloride The process of adding calcium chloride solution does not take into account the problem of fouling caused by adding pipelines during the process of adding calcium chloride solution
Have not yet seen the research report or patent document that solves the above problem fully at present, in view of this, propose the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing calcium chloride solution for fluorite mineral processing wastewater treatment, comprising the following steps:

[0023] (1) Take lime and hydrochloric acid as raw materials, add them to the reactor for stirring reaction, and filter the reactants when the pH value of the reaction system is 4.5;

[0024] (2) In the filtrate obtained in step (1), first add ammonia triacetamide of 0.02% of the total mass of calcium chloride in the filtrate, and then add calcium chloride solid to prepare a calcium chloride solution with a mass concentration of 53.5%;

[0025] (3) Add polyaluminum chloride and citric acid to the solution obtained in step (2), the amount of polyaluminum chloride added is 2% of the total mass of calcium chloride in the solution, and the amount of malic acid added is 2% of the total mass of calcium chloride in the solution 0.03% of the total mass, stirred evenly, and aged for 2 hours to obtain the product.

Embodiment 2

[0027] A method for preparing calcium chloride solution for fluorite mineral processing wastewater treatment, comprising the following steps:

[0028] (1) Take lime and hydrochloric acid as raw materials, add them to the reactor for stirring reaction, and filter the reactants when the pH value of the reaction system is 5;

[0029] (2) In the filtrate obtained in step (1), first add ammonia triacetamide of 0.03% of the total mass of calcium chloride in the filtrate, and then add calcium chloride solid to prepare a calcium chloride solution with a mass concentration of 55.2%;

[0030] (3) Add polyaluminum chloride and citric acid to the solution obtained in step (2), the addition of polyaluminium chloride is 2.5% of the total mass of calcium chloride in the solution, and the addition of acetic acid is the total mass of calcium chloride in the solution 0.05% of the mass, stirred evenly, and aged for 2 hours to obtain the product.

Embodiment 3

[0032] A method for preparing calcium chloride solution for fluorite mineral processing wastewater treatment, comprising the following steps:

[0033] (1) Take lime and hydrochloric acid as raw materials, add them to the reactor for stirring reaction, and filter the reactants when the pH value of the reaction system is 4.5;

[0034] (2) In the filtrate obtained in step (1), first add ammonia triacetamide of 0.05% of the total mass of calcium chloride in the filtrate, and then add calcium chloride solid to prepare a calcium chloride solution with a mass concentration of 57.0%;

[0035] (3) Add polyaluminum chloride and citric acid to the solution obtained in step (2), the amount of polyaluminum chloride added is 3.0% of the total mass of calcium chloride in the solution, and the amount of citric acid added is 3.0% of the total mass of calcium chloride in the solution 0.07% of the total mass, stirred evenly, and aged for 2 hours to obtain the product.

[0036] Calcium chloride ...

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PUM

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Abstract

The invention relates to a preparation method of calcium chloride solution for fluorite mine beneficiation wastewater treatment, applied to removal of silicate and fluorinion in fluorite mine beneficiation wastewater. The preparation method includes the steps of subjecting raw materials, namely lime and hydrochloric acid, to stirring reaction in a reaction kettle, filtering after finishing reaction, adding a crystallizing inhibitor and calcium chloride sequentially in filtrate to prepare calcium chloride solution with mass concentration being 45-58%, and finally adding aluminium polychlorid and organic acid in the calcium chloride solution, stirring uniformly, and ageing for 2 hours to to obtain the product. According to the preparation method, the technological process is short, the amount of waste residues is small, the production efficiency is high, and the calcium chloride solution has adjustablely high concentration.

Description

technical field [0001] The invention belongs to the technical field of mine wastewater treatment, and in particular relates to a preparation method of calcium chloride solution for the treatment of fluorite ore dressing wastewater. Background technique [0002] my country is rich in fluorite resources, mainly distributed in Jiangxi, Zhejiang, Guizhou, Henan, Fujian and other provinces, and its reserves account for 23% of the world's total. The amount of water used for fluorite flotation and the amount of wastewater produced are large. During the beneficiation process of fluorite ore, sodium silicate, oleic acid, sodium carbonate and other beneficiation agents are mostly added, which makes this kind of wastewater have high alkalinity, high suspended solids, and high fluorine. characteristics of compounds. In the treatment process of fluorite ore beneficiation wastewater, removal of fluoride and suspended solids is the focus and even more critical. At present, there have bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F101/14C02F103/10
Inventor 曹兴
Owner FENY