Treatment method for wastewater produced during tantalum-niobium hydrometallurgy

A technology of hydrometallurgy and wastewater treatment, which is applied in the field of metallurgy and can solve problems such as radioactive slag

Inactive Publication Date: 2021-07-23
NINGXIA ORIENT TANTALUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] This application provides a treatment method for tantalum-niobium hydrometallurgical wastewater to solve the problem that elements such as uranium, thorium, and radium in the wastewater will precipitate into the slag together, resulting in radioactive slag

Method used

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  • Treatment method for wastewater produced during tantalum-niobium hydrometallurgy
  • Treatment method for wastewater produced during tantalum-niobium hydrometallurgy
  • Treatment method for wastewater produced during tantalum-niobium hydrometallurgy

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Experimental program
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Effect test

Embodiment

[0058] 1. Pre-decomposition

[0059] Crush the tantalum-niobium ore to 300 meshes, and then pre-decompose the ore and dilute sulfuric acid solution with an acidity of 10% according to the weight ratio of 1:2-1:3, and the decomposition temperature is below 80 degrees Celsius. The decomposition time is 24-48 hours. Finally, the acid solution is filtered to obtain a filter residue and a filtrate. The filtrate goes to the next step. The waste water composition in the solution that obtains is as follows:

[0060] The composition of radioactive wastewater is as follows (fluorine content 125 g / L)

[0061]

[0062] The wastewater produced by smelting tantalum and niobium minerals contains natural uranium, thorium and their daughters 226Ra, 228Ra and 224Ra, of which 226Ra and 224Ra are alpha emitters, and 228Ra is beta emitter.

[0063] 2. Adjust acidity

[0064] Add the filtrate from step 1 into the reaction tank, use 100 kg of prepared sodium hydroxide solution, stir and reac...

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Abstract

The invention discloses a treatment method for wastewater produced during tantalum-niobium hydrometallurgy. The treatment method comprises the following steps: crushing tantalum-niobium ore to 300 meshes, carrying out acid treatment at 20-80 DEG C, and conducting reacting to obtain a solid and a reaction solution; adding hydrofluoric acid and sulfuric acid into the solid for decomposition, and then carrying out a preparation process for potassium fluotantalate and niobium oxide; adjusting the acid of the reaction solution with water or an alkaline solution to enable the pH value of the reaction solution to be 1-1.5, and conducting filtering to obtain a filtrate; enabling the filtrate to pass through a nanofiltration membrane system, and screening the filtrate; allowing the screened filtrate to enter an extraction separation tank, and conducting extraction by using a solvent extraction method to obtain an organic phase containing uranium and thorium and a water phase containing radium; carrying out back extraction on the organic phase by using NaOH with a concentration of 5 mol / L as a back extraction agent; filtering the back-extracted solution to obtain a precipitate, and drying and storing the precipitate; putting the water phase into a reaction tank, adding BaCl2, and carrying out eutectic precipitation; and filtering the water phase in the reaction tank, conducting standing, and adding sodium hydroxide to adjust the pH value to 6-8.

Description

technical field [0001] The application relates to the field of metallurgy technology, in particular to a method for treating tantalum-niobium hydrometallurgical wastewater. Background technique [0002] The production of tantalum and niobium fluoride salts and oxides is mainly composed of four processes, ore decomposition, extraction and separation, precipitation and crystallization, and drying and calcination. First, the tantalum-niobium concentrate is ground to a certain particle size in vibrating nodular ink; the ground concentrate is decomposed in a decomposition tank with steam heating or water bath heating: first add hydrofluoric acid and sulfuric acid, and then gradually concentrate, at the same time Mechanical stirring is carried out, and the decomposition temperature is above 80°C; the purpose of adding sulfuric acid is to strengthen the decomposition reaction, reduce the fragmentation of the ore, shorten the reaction time, and partially replace the more expensive h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C22B3/10C22B34/24C22B3/08C02F101/14C02F103/16
CPCC02F9/00C22B3/08C22B3/10C22B34/24C02F1/66C02F1/001C02F1/442C02F1/265C02F2101/006C02F2101/14C02F2103/16
Inventor 张伟宁叶挺志聂全新陈福贵鲁东高文通李辉
Owner NINGXIA ORIENT TANTALUM IND
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