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Device and method for recovering nitric acid from waste liquid containing nitric acid

A recovery device, nitric acid technology, applied in the field of uranium hydrometallurgy, can solve the problems of high cost, unfavorable production, environmental pollution, low recovery rate of nitric acid, etc.

Active Publication Date: 2021-04-20
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Above-mentioned method can reclaim part nitric acid to a certain extent, but the rate of recovery of nitric acid is low
In order to improve the recovery rate of nitric acid, other new substances are sometimes added to improve the recovery rate of nitric acid during the recovery process, but the new substances added will cause further difficulties in wastewater treatment, or produce other substances to cause new environmental pollution and resources. Waste, or high cost is not conducive to production

Method used

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  • Device and method for recovering nitric acid from waste liquid containing nitric acid
  • Device and method for recovering nitric acid from waste liquid containing nitric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1. The device for recovering nitric acid from waste liquid containing nitric acid, including a distillation kettle 1 with a heating and stirring device, a condenser 2, a distillation buffer tank 3, a liquid storage tank 4, and a second vacuum gauge 5-1 Buffer tank 5, vacuum pump 6.

[0062] The top of the still 1 is provided with a first thermometer 1-1 for measuring the temperature of the liquid in the still 1, a first valve 1-2 is provided at the feed port, and a first vacuum for measuring the vacuum degree of the still 1 is provided at the top. Table 1-3, the bottom three-way discharge pipe is provided with a second valve 1-4 and a third valve 1-5, and the third valve 1-5 is used for sampling.

[0063] A fourth valve 3-1 is provided on the air outlet pipe at the top of the distillation buffer tank 3, and a fifth valve 3-2 is provided on the outlet pipe at the bottom of the distillation buffer tank 3.

[0064] A sixth valve 4-1 is provided on the air outle...

Embodiment 2

[0067] Embodiment two, adopt the recovery device as described in embodiment one to reclaim the method for nitric acid from waste liquid containing nitric acid, the content of nitric acid in the waste liquid containing nitric acid is 100~250g / L, and the whole recovery process adopts intermittent two-stage Distillation, the secondary distillation is carried out after the primary distillation, and the primary distillation and the secondary distillation are completed by a recovery device.

[0068] The specific operation steps are as follows:

[0069] A. Primary distillation

[0070] A1. Open the first valve 1-2 on the feed port of distillation still 1 to add waste liquid containing nitric acid. The amount of waste liquid containing nitric acid is two-thirds to four-fifths of the volume of still kettle 1. Close the first valve after feeding is completed. A valve 1-2, simultaneously open the fourth valve 3-1 on the air outlet pipeline of the distillation buffer tank 3, the fifth va...

Embodiment 3

[0086] Embodiment three, from the two-stage series connection device that reclaims nitric acid from nitric acid waste liquid, two sets of recovery devices as described in embodiment one are connected in series, and in two sets of recovery devices connected in series, one set of recovery devices is used as a Stage distillation recovery device I is used for primary distillation, and a set of recovery device is used as secondary distillation recovery device II for secondary distillation.

[0087] Wherein: the volume of the still kettle 1 in the secondary distillation recovery device II is half of the volume of the still kettle 1 in the primary distillation recovery device I.

[0088] The volume of the distillation buffer tank 3 in the secondary distillation recovery device II is half of the volume of the distillation buffer tank 3 in the primary distillation recovery device I.

[0089] The volume of the liquid storage tank 4 in the secondary distillation recovery device II is hal...

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Abstract

The device and method for recovering nitric acid from waste liquid containing nitric acid, the air outlet on the distillation kettle of the recovery device is connected with the air inlet on the condenser through a pipeline, the pipeline is provided with a second thermometer for measuring the vapor temperature, and the airflow inlet on the condenser The air outlet is connected to the feed port on the distillation buffer tank through a pipe, the bottom discharge pipe of the distillation buffer tank is connected to the feed port of the liquid storage tank through a pipe, the air outlet pipe of the distillation buffer tank and the air outlet pipe of the liquid storage tank The gas flow inlet ends of the buffer tanks with vacuum gauges are respectively connected through pipelines, and the gas flow outlet pipeline ends of the buffer tanks are connected with vacuum pumps through pipelines. The recovery process adopts intermittent two-stage distillation. After the first-stage distillation, the second-stage distillation is carried out, and the first-stage bottom liquid is used as the stock solution of the second-stage distillation. After the residue discharged from the secondary distillation and the secondary bottom liquid are filtered, the filtrate and the nitric acid-containing waste liquid are subjected to primary distillation together, and the filter residue enters the wastewater treatment system for further treatment.

Description

technical field [0001] The invention relates to the technical field of uranium hydrometallurgy, in particular to a device and method for recovering nitric acid from nitric acid-containing waste liquid. Background technique [0002] At present, nitric acid dissolution-extraction-back extraction-ammonia precipitation process is used to purify and extract uranium in the purification and enrichment of uranium, the recovery of waste generated in the production of nuclear fuel elements, and the reprocessing of spent fuel. During the production process of this process, nitric acid-containing waste liquid will be generated, and the concentration of nitric acid in the nitric acid-containing waste liquid can reach 100-250 g / L. In the past, the conventional wastewater treatment method was to mix the nitric acid-containing waste liquid with other wastewater, add ammonia water to neutralize to weak alkalinity, and discharge it after generating nitrate. On the one hand, this process needs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/02B01D3/14C01B21/46
CPCB01D3/02B01D3/14C01B21/46
Inventor 王清良胡鄂明许娜王红强周文侯伟李会娟李乾刘建东马战争郭鑫
Owner NANHUA UNIV
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