Method for treating waste compound salt by-products and waste washing water of tantalum powder production by sodium reduction method

A technology of compound salt and reduction method, which is applied in the field of metallurgy, can solve the problems such as the difficulty of wastewater discharge to meet the standard, the large amount of washing water, and the large amount of lime used, and achieve the effect of reducing the amount of washing water

Active Publication Date: 2019-03-01
株洲高力新材料有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method to solve the problems such as large amount of washing water, no recovered products, large amount of lime, and difficulty in meeting the discharge standard of waste water in

Method used

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  • Method for treating waste compound salt by-products and waste washing water of tantalum powder production by sodium reduction method
  • Method for treating waste compound salt by-products and waste washing water of tantalum powder production by sodium reduction method
  • Method for treating waste compound salt by-products and waste washing water of tantalum powder production by sodium reduction method

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Embodiment 1

[0040] This embodiment is specifically a method for treating waste composite salt by-products and waste washing water of tantalum powder produced by a sodium reduction method. The experimental raw materials in this example are: 200kg K 2 TaF 7 Carry out sodium reduction reaction with 60kgNa and 75kgNaCl, obtain reaction product tantalum and composite salt, this product is solid after cooling, gross weight 335kg, as figure 1 As shown, part of the complex salt floated on top of the reaction product. like figure 2 As shown, a simplified process flow diagram of a method for treating waste composite salt by-products of tantalum powder and waste washing water by a sodium reduction method of the present embodiment, the specific operations of the present embodiment are as follows:

[0041] S1. Peeling: Pick out the upper layer by manual peeling, and weigh 68kg of the picked-up waste compound salt. The picked-up product is detected to contain NaCl 31.1%, KF 24.5%, and NaF 44.4%;

...

Embodiment 2

[0048] The present embodiment is specifically a method for treating waste composite salt by-products and waste washing water of tantalum powder produced by a sodium reduction method, such as figure 2 As shown, a simplified process flow diagram of a method for treating waste composite salt by-products and waste washing water of tantalum powder produced by a sodium reduction method in this embodiment.

[0049] This embodiment uses raw materials, and steps S1 to S4 are the same as those in Embodiment 1, and other specific steps are as follows:

[0050] S5. metal calcium salt precipitation: after the combined solution of step S4 is fully stirred and merged, take 920ml of a nearly saturated solution with a NaF content of 37.83g / L, add 94.724g calcium chloride (containing 6 crystal water), precipitate, filter, rinse, After drying, 31.14g CaF was obtained 2 product, the recovery rate of F ions is as high as 96.35%; 2 The mother liquor contains 1.51mg / L of F ions, which is lower th...

Embodiment 3

[0053] The present embodiment is specifically a method for treating waste composite salt by-products and waste washing water of tantalum powder produced by a sodium reduction method, such as figure 2 As shown, a simplified process flow diagram of a method for treating waste composite salt by-products and waste washing water of tantalum powder produced by a sodium reduction method in this embodiment.

[0054] The raw materials, steps S1 to S4 of this embodiment are the same as those of Embodiment 1, and other specific steps are as follows:

[0055] S5. metal magnesium salt precipitation: after the combined solution of step S4 is fully stirred and combined, take 920ml of a nearly saturated solution with a NaF content of 37.83g / L, add 29g of MgCl 2 , precipitation, filtration, washing, drying to obtain 23.68gMgF 2 product, F ion recovery was 96.40%, precipitation MgF 2 The mother liquor contains 32.3mg / L of fluoride ions;

[0056] S6. Mother liquor purification: add an approp...

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Abstract

The invention relates to a method for treating waste compound salt by-products and waste washing water of tantalum powder production by a sodium reduction method. The method involved in the inventionis characterized in that cooled tantalum and compound salt reaction products are used as raw materials; firstly, the waste compound salt by-products floating above the tantalum powder are peeled, andafter peeled products are dissolved in water and are filtered, a sodium fluoride precipitate and a compound salt solution can be obtained; after the peeling, the remaining products are subjected to ball grinding and dissolution so as to obtain an approximate saturated sodium fluoride solution, and the two solutions are combined and are added into metal chloride for precipitation reaction so as toobtain metal fluoride precipitates and fluorine-containing mother liquid; when calcium chloride is used as a precipitant, the obtained mother liquid can be directly discharged, and when magnesium chloride or aluminum chloride is used as the precipitant, the mother liquid can be directly discharged after simple purification treatment; and the dischargeable mother liquid can be subjected to reverseosmosis regeneration treatment. The method involved in the invention has the advantages that the washing water quantity is reduced; the valuable products are recovered; the problem of great lime consumption is solved; meanwhile, fluorine ions can easily reach the discharging standards; and the method has simple process steps and is suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more particularly relates to a method for treating waste compound salt by-products and waste washing water of tantalum powder produced by a sodium reduction method. Background technique [0002] Metal tantalum is an indispensable metal in aerospace, electronic chips, high-end imaging, high-energy equipment, precision machining and other fields, and it is also the best metal for human bone replacement. The main method of producing metal tantalum is the "metal sodium reduction method". The sodium reduction method to produce tantalum powder mainly uses NaCl and NaF as diluents, and uses metal sodium to reduce potassium fluorotantalate to obtain tantalum powder. The by-product is a molten salt mixture. The Na reduction reaction formula of grade tantalum powder is as follows: [0003] K 2 TaF 7 +Na+NaCl=Ta+KF+NaF+NaCl [0004] The waste composite salt by-product of the production of tantalu...

Claims

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Application Information

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IPC IPC(8): C01D3/02C01F11/22C01F11/46C01F7/50C01F5/28C02F9/04B22F9/24C02F101/14
CPCB22F9/24C01D3/02C01F5/28C01F7/50C01F11/22C01F11/46C01P2006/80C02F1/001C02F1/5245C02F1/583C02F1/66C02F9/00C02F2101/14C02F2301/08
Inventor 唐建中
Owner 株洲高力新材料有限公司
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