Silicon slag treating process in zirconyl chloride production

A technology of zirconium oxychloride and processing technology, which is applied in the field of zirconium oxychloride-acid-alkali production technology, can solve the problems of low yield rate of zirconium oxychloride, affect the economic benefits of enterprises, waste of resources and other problems, and achieve improvement The effect of improving yield, reducing waste of resources and improving economic benefits

Active Publication Date: 2009-10-28
英格瓷(浙江)锆业有限公司
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Problems solved by technology

The waste treatment of silicon slag results in the waste of valuable metal element zirconium, and also

Method used

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  • Silicon slag treating process in zirconyl chloride production

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Example Embodiment

[0019] Example 1

[0020] Such as figure 1 As shown, (1) The zircon sand and solid caustic are alkali-melted, undergo a water washing transformation process, water washing to remove silicon, transformation to remove sodium, after an acidification process, add hydrochloric acid to acidify, and then add a silicon slag lotion and / or two The secondary silicon slag washing liquid dilutes the acidified material liquid, and the volume ratio of the primary silicon slag washing liquid and / or the secondary silicon slag washing liquid and the acidified material liquid is 0.8-1.2:0.8-1.2, separated by a filter press process to obtain a zirconium-containing mother liquor And acidic silicon slag, the zirconium-containing mother liquor is concentrated and crystallized and pickled to remove iron to obtain zirconium oxychloride; (2) acidic silicon slag is rinsed with 0.5N hydrochloric acid and filtered to obtain primary silicon slag and primary silicon slag Washing liquid; the primary silicon slag...

Example Embodiment

[0021] Example 2

[0022] (1) The zircon sand is melted in alkali, washed with water to remove silicon, transformed to remove sodium, and acidified with hydrochloric acid, then add a silicon slag lotion to dilute the acidified material liquid. The volume ratio of the primary silicon slag washing liquid to the acidified material liquid is 1:1. Press filtration and separation to obtain zirconium-containing mother liquor and acidic silicon slag. The zirconium mother liquor is concentrated and crystallized to produce zirconium oxychloride products. For every 1 ton of zirconium oxychloride produced, about 0.5 tons of acidic silicon slag is produced; (2) Acidic silicon slag Use 3N concentrated crystalline condensed hydrochloric acid to rinse and filter to obtain primary silicon slag and primary silicon slag washing liquid. The zirconium content in the primary silicon slag washing liquid is 20-25g / L, and the primary silicon slag washing liquid is reused to the acidification process; (3) ...

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Abstract

The invention relates to a silicon slag treating process in zirconyl chloride production, comprising alkali fusion, washing, acidifying, rinsing white residue, concentrating, crystallizing, pickling and deironing. After acidifying, the white residue is rinsed over again by 0.5-3 N hydrochloric acid to leach out soluble zirconium as much as possible and deposit and recover the unreacted zirconium sand. The invention recovers the valuable element in the white residue, improves the yield of the zirconyl chloride, decreases the resource waste, has low equipment investment and improves the enterprise economic benefit.

Description

technical field [0001] The invention relates to a zirconium oxychloride-acid (hydrochloric acid)-alkali production process, especially the treatment of silicon slag produced in the production process, recovery of soluble zirconium and unreacted zircon sand in the silicon slag, and improvement of the yield of zirconium oxychloride . technical background [0002] Zirconium oxychloride is an important basic chemical product of zirconium salt. Zirconium oxide, zirconium sulfate, zirconium carbonate and other zirconium chemicals can be prepared from zirconium oxychloride, which are widely used in ceramics, chemical industry, light industry, electronics and other industries. At present, zirconium oxychloride is mainly produced by zircon sand-acid (hydrochloric acid)-alkali method, including alkali fusion, water washing transformation, acidification, concentrated crystallization, acid leaching and iron removal. In the existing zirconium oxychloride production process, silicon slag...

Claims

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Application Information

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IPC IPC(8): C01G25/00
Inventor 蒋东民沈建章王力军陈伟东
Owner 英格瓷(浙江)锆业有限公司
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