Method for preparing thorium nitrate by utilizing monazite excellent molten slag

A technology of thorium nitrate and slag melting, which is applied in the field of preparing thorium nitrate by using monazite excellent slag melting, can solve the problems such as not being used, and achieve the effect of reducing the extraction efficiency

Active Publication Date: 2022-03-11
湖南中核金原新材料有限责任公司
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for preparing thorium nitrate by using monazite excellent slag, aiming at solving the problem that existing monazite excellent slag cannot be used due to the existence of a large amount of chloride ions Technical Problems in Thorium Extraction by TBP Extraction

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  • Method for preparing thorium nitrate by utilizing monazite excellent molten slag
  • Method for preparing thorium nitrate by utilizing monazite excellent molten slag

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Embodiment 1

[0052] (1) Pretreatment and titanium removal treatment: Take 3000Kg of monazite excellent molten slag of the above composition and pour it into 10m 3 In the PPH tank with stirring, add 3000L of water according to S:L=1:1, add 1050L of 98% fuming nitric acid under stirring state, turn on the heating to boil, stir and keep warm for 1h. After keeping warm for 1 hour, add tap water to S:L=1:2, and measure the concentration of residual acid to be 3.27mol / L; when the solution temperature is 60°C, add 50L of hydrogen peroxide and 0.4L of polyether, stir well and use a 100m2 diaphragm filter press Press filtration, the feed liquid is aged for 12 hours, filtered with a 5 μm precision filter, and the filtrate is used to obtain a clarified feed liquid B-5.19m 3 . NO in feed liquid 3 - 3.91mol / L, REO 43.10g / L, ThO 2 70.82g / L, U 3 0 8 3.02g / L, Fe 5.06g / L, TiO 2 6.11g / L, ZrO 2 0.11g / L, Cl - 40.31g / L, the direct recovery rate of thorium is 88.27%, the direct recovery rate of rar...

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Abstract

The invention discloses a method for preparing thorium nitrate by using monazite excellent molten slag, which comprises the following steps: (1) slurry pretreatment: mixing the monazite excellent molten slag into slurry, adding nitric acid, heating and stirring to obtain feed liquid A; (2) titanium removal treatment: carrying out titanium removal treatment on the feed liquid A, and filtering to obtain filtrate B; (3) uranium extraction: extracting the filtrate B to obtain a uranium-containing organic phase, heating with a nitric acid solution for back extraction, and carrying out precipitation treatment to obtain raffinate C; (4) thorium extraction: extracting the raffinate C to obtain a thorium-containing organic phase and raffinate D, and heating the thorium-containing organic phase with a nitric acid solution for back extraction to obtain thorium back extraction liquid E; and (5) thorium nitrate crystallization: carrying out concentration treatment on the thorium strip liquor E, carrying out uranium extraction operation in the step (3) on the obtained concentrated liquor to obtain raffinate F, carrying out crystallization treatment on the raffinate F, and continuously carrying out solid-liquid separation to obtain high-purity thorium nitrate. The invention aims to improve the extraction efficiency of the superior monazite slag.

Description

technical field [0001] The invention relates to the technical field of chemical smelting, in particular to a method for preparing thorium nitrate from monazite slag. Background technique [0002] Monazite is an important phosphate rare earth mineral, often accompanied by more radioactive elements such as thorium and uranium, and a small amount of minerals such as rutile, ilmenite, zircon and quartz. The decomposition methods commonly used in industry mainly include sulfuric acid, soda ash roasting method, and sodium hydroxide alkali boiling decomposition method. The most widely used method is sodium hydroxide alkali boiling decomposition method at present. The monazite concentrate is heated to 130-160°C in a sodium hydroxide solution to undergo a solid-liquid multiphase reaction. The degree of decomposition of rare earth, thorium, and uranium is affected by various factors. Decomposition and washing of alkali-soluble substances results in an alkali cake consisting of hydrox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B60/02C22B3/06C22B3/38C22B59/00
CPCC22B60/0291C22B60/026C22B3/065C22B59/00Y02P10/20
Inventor 苏学斌吕荣平曾中贤王超刘浩刘盛欧阳宇平王晓菲王峰李恩明姜子奕
Owner 湖南中核金原新材料有限责任公司
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