Treatment method of superior molten slag of monazite

A treatment method and a technology for optimizing slag dissolution, which are applied in chemical instruments and methods, improvement of process efficiency, uranium oxide/hydroxide, etc., can solve problems such as complicated process, difficult management, and unsatisfactory separation effect, and achieve waste Less acid discharge, good separation effect, and low raw material consumption

Active Publication Date: 2020-11-17
永州市湘江稀土有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also techniques for extracting uranium with ion exchange resins in sulfuric acid medium, acidic phosphate esters (such as P-204) for extracting thorium, and primary amines for extracting rare earths (such as CN103014359A, CN103014333A, etc.). Two technologies and two extraction agents, the process is complex and difficult to manage, and the separation effect is not ideal, so far there is no report on large-

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  • Treatment method of superior molten slag of monazite

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Embodiment 1

[0104] Dissolve a certain batch of monazite excellent molten slag (Kg): industrial HCl (L) (about 9.5mol / L) = 1.0:2.0 according to the method of the above-mentioned step (1), and the pulping concentration is 40Be', and it is as listed in Table 1. The complete solution composed of;

[0105] Table 1 Composition of the complete solution obtained from monazite excellent slag dissolution

[0106] components u 3 o 8

[0107] According to the above-mentioned steps (2), with 20% tributyl phosphate (TBP)-kerosene solution as the extractant, the obtained iron-containing and uranium-containing organic phase is washed with 2.5mol / L HCl as the washing liquid; wherein, the iron-uranium extractant : Total solution: cleaning solution ratio=2.0:1.0:0.33, 12 grades in the extraction section, 6 grades in the cleaning section;

[0108] According to above-mentioned steps (3), take 20% tributyl phosphate (TBP)-kerosene solution as extraction agent, 0.25mol / LHNO 3 For washing iron,...

Embodiment 2

[0116] Monazite rare earth excellent molten slag (Kg): industrial HCl (L) (about 9.5mol / L)=1.0:2.0 (L) is dissolved excellent molten slag according to the method for above-mentioned step (1), and the mixing concentration is 45Be ', Properly controlling the dilution volume can obtain a higher concentration of the whole solution. Its composition is listed in Table 4.

[0117] Table 4 Composition of the complete solution obtained from monazite excellent melting slag

[0118] components u 3 o 8

THO 2

REO Fe 2 o 3

HCl Concentration(g / L) 3.5 62 40 8 2.5N

[0119] According to the above steps (2), with 20% dimethylheptyl methylphosphate (P-350)-kerosene solution as the extractant, the obtained iron-containing and uranium-containing organic phase uses 2.5mol / L HCl as the washing liquid; Agent: full solution: washing liquid = 2.0:1.0:0.33, 12 stages in the extraction section, 6 stages in the washing section;

[0120] According to the...

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Abstract

The invention relates to a treatment method of superior molten slag of monazite. Specifically, the treatment method is a method for extracting and separating iron, uranium, thorium and mischmetal in the superior molten slag of the monazite in a mixed acid solution of hydrochloric acid and nitric acid, and comprises the following steps : thermally dissolving the superior molten slag using hydrochloric acid; separating iron, uranium-thorium and rare earth; separating iron and uranium; preparing mixed feed liquor of hydrochloric acid and nitric acid for thorium and rare earth; separating thoriumand rare earth; and extracting mischmetal. The treatment method is good in uranium, thorium and rare earth separation effect and high in recovery rate, uranium and thorium products meeting nuclear fuel requirements can be produced, cyclic utilization of acid can be achieved, and the treatment method is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and specifically relates to a method for extracting and separating iron, uranium, thorium and mixed rare earths in monazite slag in a mixed acid solution of hydrochloric acid and nitric acid. Background technique [0002] my country's industrial-scale processing of monazite and extraction of uranium, thorium and rare earth elements began in the late 1950s. Shanghai Yuelong Chemical Plant dissolved the monazite alkali-dissolved cake with concentrated nitric acid, and then used tributyl phosphate (TBP) in the Separation of uranium, thorium and rare earth in nitric acid solution, because of high consumption, the separation effect is not good. In the early 1970s, it was changed to hydrochloric acid to dissolve rare earth. Separation of uranium, thorium and rare earths. This law has been used until the beginning of this century when the plant was closed due to environmental problems. In addition to diss...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00C22B60/02C22B3/38C01G43/01C01F15/00
CPCC01F15/00C01G43/01C22B7/007C22B59/00C22B60/023C22B60/0291C22B3/3844C22B3/3846Y02P10/20
Inventor 张宝藏秦毓根殷留庆张香标
Owner 永州市湘江稀土有限责任公司
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