Processing method of complex raffinate

A treatment method and technology for raffinate, which are applied in chemical instruments and methods, heating water/sewage treatment, degassed water/sewage treatment, etc., can solve the problems of large investment and high treatment costs, save energy and reduce treatment costs. , the effect of reducing environmental pollution problems

Inactive Publication Date: 2015-01-07
ZHEJIANG HUAYOU COBALT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, ion exchange recovery and breakpoint chlorine oxidation are seldom used due to the disadvantages of large investment and high treatment costs.

Method used

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  • Processing method of complex raffinate

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Experimental program
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Effect test

Embodiment 1

[0030] The method for processing the raffinate obtained by using nickel-cobalt sulfide ore as raw material and extracted by P204 and P507 comprises the following process steps:

[0031] (1) After being extracted by P204 and P507, the raffinate containing 16% sodium sulfate, ammonia nitrogen 6g / L, cobalt 100mg / L, nickel 100mg / L, and manganese 95mg / L is sent to the primary plate heat exchanger for precooling, The raffinate at 34-35°C is exchanged with the 0-1°C denitrification mother liquor from the three-stage freezing crystallizer to cool down. The pre-cooled raffinate reaches a temperature of 23-24°C and enters the first-stage freezing crystallizer. The process temperature of the first-stage freezing crystallizer is controlled at 16°C. At this time, the raffinate will precipitate part of sodium sulfate in the first-stage freezing crystallizer. The supernatant in the tank is successively transferred to the secondary freezing crystallizer and the tertiary freezing crystallizer ...

specific Embodiment approach 2

[0044] The method for processing the raffinate obtained by using nickel-cobalt sulfide ore as raw material and extracted by P204 and P507 comprises the following process steps:

[0045] (1) After being extracted by P204 and P507, the raffinate containing 20% ​​sodium sulfate, ammonia nitrogen 8g / L, cobalt 100mg / L, nickel 80mg / L, and manganese 90mg / L is sent to the primary plate heat exchanger for precooling, The raffinate at 37-38°C is exchanged with the 0-1°C denitrification mother liquor from the three-stage freezing crystallizer to cool down. The pre-cooled raffinate reaches a temperature of 25-26°C and enters the first-stage freezing crystallizer. The process temperature of the first-stage freezing crystallizer is controlled at 16°C. At this time, the raffinate will precipitate part of sodium sulfate in the first-stage freezing crystallizer. The supernatant in the tank is successively transferred to the secondary freezing crystallizer and the tertiary freezing crystallizer...

specific Embodiment approach 3

[0058] The method for processing the raffinate obtained by using nickel-cobalt sulfide ore as raw material and extracted by P204 and P507 comprises the following process steps:

[0059] (1) After being extracted by P204 and P507, the raffinate containing 18% sodium sulfate, ammonia nitrogen 7g / L, cobalt 95mg / L, nickel 90mg / L, and manganese 95mg / L is sent to the primary plate heat exchanger for precooling, The raffinate at 37-38°C is exchanged with the 0-1°C denitrification mother liquor from the three-stage freezing crystallizer to cool down. The pre-cooled raffinate reaches a temperature of 24-25°C and enters the primary freezing crystallizer. The process temperature of the primary freezing crystallizer is controlled at 16°C. At this time, the raffinate will precipitate part of sodium sulfate in the primary freezing crystallizer. The supernatant in the tank is successively transferred to the secondary freezing crystallizer and the tertiary freezing crystallizer together with ...

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Abstract

The invention discloses a processing method of complex raffinate. The processing method comprises the following steps of carrying out three-stage freezing crystallization on complex raffinate generated after P204 or P507 extraction in nickel-cobalt metallurgy and carrying out centrifugal separation to obtain purified sodium sulfate decahydrate crystals and a frozen-crystallized solution; adjusting the pH value of the frozen-crystallized solution and feeding the frozen-crystallized solution to a deaminizing device for deaminizing so as to recover ammonia water and valuable metals; concentrating the deaminized solution by virtue of DTRO (Disk Tubular Reverse Osmosis), carrying out hot melting on sodium sulfate decahydrate crystals, feeding into a MVR (Mechanical Vapor Recompression) evaporator for crystallizing, filtering, feeding to a fluidized bed and drying to obtain high-purity anhydrous sodium sulphate. Due to adoption of the process, zero emission and recycling of raffinate wastewater are achieved and the valuable metals are recovered, the high-purity anhydrous sodium sulphate product is prepared so that the processing method has the advantages of low energy consumption, resource conservation and the like.

Description

technical field [0001] The invention relates to a method for processing raffinate, in particular to a method for processing complex raffinate containing sodium sulfate and high ammonia nitrogen. Background technique [0002] For a long time, the non-ferrous metal industry has a large amount of industrial wastewater discharge, complex sources of pollution, and a wide variety of pollutants, making it more difficult to treat the wastewater. The extensive use of nickel-cobalt sulfide ore raw materials containing ammonia nitrogen in the nickel-cobalt industry, as well as the selection of the current production process, make the raffinate not only have a relatively high content of sodium sulfate, but also a high concentration of ammonia nitrogen. The ammonia nitrogen-containing waste water with high salinity cannot be directly biochemically treated. Therefore, the treatment of raffinate not only needs to consider the treatment of sodium sulfate but also the treatment of ammonia ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D5/00
CPCC02F9/00C01D5/00C02F1/04C02F1/20
Inventor 向波刘秀庆刘永东万紫
Owner ZHEJIANG HUAYOU COBALT
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