Method for preparing thorium oxide by utilizing monazite excellent molten slag

A technology of thorium oxide and slag melting, which is applied in the field of preparing thorium oxide by using excellent slag of monazite, can solve the problems of multiple extractions, and achieve the effects of reducing extraction links, no environmental pollution, and simple operation

Pending Publication Date: 2022-04-05
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 oxide by using monazite slag, aiming to solve the technical problem that the existing monazite slag needs multiple extractions to extract thorium

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

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Embodiment 1

[0044] 1. Raw material components

[0045] The typical values ​​of the main components of monazite excellent molten slag are shown in the following table: the water content of wet base analysis is 40%, and its main chemical components are shown in Table 1.

[0046]

[0047] Table 1 The main chemical components of monazite excellent molten slag

[0048] 2. Preparation

[0049] (1) Pretreatment: Take 1000Kg of monazite excellent molten slag of the above ingredients and pour it into a 5m3 PP tank with stirring, add water to adjust the solid content to 20%, use a 6-S fine sand shaker, stroke 15mm, stroke times 300 times / min, the transverse inclination angle is 2.6°, the longitudinal inclination angle is 0.6°, the ore feeding concentration is 20%, and the ore feeding rate is 0.1T / min. Select heavy sand, the main components of heavy sand are (slag rate ~ 25%): moisture ~ 10%, monazite and xenotime ~ 25%, zircon ~ 50%, rutile ~ 3%, etc., return to monazite Concentrate alkali b...

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Abstract

The invention discloses a method for preparing thorium oxide by using monazite excellent molten slag. The method comprises the following steps: carrying out reselection or magnetic separation treatment on the monazite excellent molten slag, and carrying out filter pressing treatment to obtain corresponding filter residues A; sequentially performing hydrochloric acid dissolution, ammonium bicarbonate precipitation treatment and filter pressing treatment on the filter residues A to obtain corresponding filter residues B, and repeatedly performing hydrochloric acid dissolution, sodium carbonate precipitation and filter pressing treatment on the filter residues B to obtain neutral filtrate C; carrying out suction filtration treatment on the filtrate C to obtain filtrate D, slowly adding hydrochloric acid into the filtrate D, and filtering to obtain thorium-uranium carbonate precipitate; slowly adding hydrochloric acid into the thorium carbonate uranium precipitate until the pH value of the solution is 1, and carrying out counter-current extraction and back extraction to obtain raffinate E; and adding an oxalic acid solution into the raffinate D for treatment to obtain thorium oxalate precipitate, and continuing drying and roasting treatment to obtain thorium oxide powder. According to the method, the aim of avoiding multiple times of extraction for extracting thorium from the monazite excellent molten slag is achieved.

Description

technical field [0001] The invention relates to the technical field of chemical smelting, in particular to a method for preparing thorium oxide by using 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 rutile, ilmenite, zircon and quartz and other minerals. The decomposition methods commonly used in industry mainly include sulfuric acid, soda ash roasting method, and sodium hydroxide alkali boiling decomposition method. At present, the most widely used method is sodium hydroxide alkali boiling decomposition method. Monazite concentrate is heated to 130-160°C in a sodium hydroxide solution to undergo a solid-liquid multiphase reaction, and the decomposition degree of rare earth, thorium, and uranium is affected by various factors. After decomposing and washing the alkali-soluble substances, an alkali cake composed of hydroxide p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B60/02C22B3/10C22B3/44C22B3/40
CPCY02P10/20
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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