Method for recycling zirconium oxide and yttrium oxide from yttrium oxide steady zirconium oxide solid fused mass waste matter

A yttrium oxide and zirconium oxide technology, applied in zirconium oxide, chemical instruments and methods, rare earth metal compounds, etc., can solve the problems of increasing the amount of waste solution treatment, unfavorable energy saving and emission reduction, long pyrolysis time, etc., and the process is easy to achieve. Control, energy saving, low conversion temperature effect

Active Publication Date: 2008-08-20
SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment of this type of solid waste is as described in Chinese Patent Application No. 200610161270.6, which requires the addition of a relatively large amount of alkali metal oxides for high-temperature calcination and decomposition. The pyrolysis time is long, energy consumption is high, and acid and alkali consumption is large, which increases waste. The processing capacity of the solution is not conducive to energy saving and emission reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Grind to -0.175mm cubic zirconia powder (containing ZrO 2 76.45%, Y 2 o 3 18.54%, SiO 2 2.86%, Fe 2 o 3 0.58%), sulfuric acid and acidifying auxiliary ammonium sulfate are put into a reaction pot according to the solid-liquid ratio of 1:2.5:1.25, mixed evenly, and reacted at a temperature of 200-320° C. for 30 minutes to obtain an acidified frit material.

[0029] (2) Dilute the obtained acidified frit material with water. The mother liquor and eluent produced by step (4) are 1: 2.5 according to the solid-to-liquid ratio, and leached at 85-95° C. for 45-60 minutes of leaching time, and the leaching ends Then carry out solid-liquid separation to obtain zirconium yttrium clear liquid.

[0030] (3) The above clear liquid is evaporated and concentrated, and the concentrated feed liquid is controlled to contain ZrO 2 2.5~2.8mol / L, acidity [H + ]5.8~6.5mol / L, zirconium sulfate crystals were precipitated by cooling.

[0031] (4) The zirconium sulfate crystals ...

Embodiment 2

[0039] Cubic zirconia powder crushed to -0.175mm (chemical composition is the same as in Example 1) and sulfuric acid and acidification auxiliary ammonium sulfate are put into a reaction pot at a solid-to-liquid ratio of 1: 1.75: 1.25 and mixed evenly. Acidification transformation reaction at high temperature for 30 minutes to obtain acidification frit material.

[0040]All the other method steps are the same as in Example 1.

[0041] The zirconia product obtained by the technical scheme provided by the embodiment of the present invention 2 contains ZrO 2 >99.9%, SiO 2 2 o 3 2 o 3 / Re 2 o 3 >99.95%, ZrO 2 2 2 o 3 <0.0022%. The recovery rate of yttrium was 94.5%.

Embodiment 3

[0043] Cubic zirconia powder crushed to -0.175mm (chemical composition is the same as in Example 1) and sulfuric acid and acidification auxiliary ammonium sulfate are put into a reaction pot according to a solid-to-liquid ratio of 1:1.3:1.5 and mixed evenly, at 200-300°C Acidification transformation reaction at high temperature for 50 minutes to obtain acidification frit material.

[0044] All the other method steps are the same as in Example 1.

[0045] The zirconia product obtained by the technical scheme provided by the embodiment of the present invention 3 contains ZrO 2 >99.9%, SiO 2 2 o 3 2 o 3 / Re 2 o 3 >99.9%, ZrO 2 2 2 o 3 <0.0022%. The recovery rate of yttrium was 91.4%.

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Abstract

The invention relates to a method for recovering zirconia and yttria from the yttria-stabilized zirconia solid solution waste, which comprises the following steps: mixing the solid solution waste powder, sulfate and salt; acidizing and calcining at 200 to 320 DEG C; leaching the acidizing water and/or mother liquor under self-heating conditions; concentrating the leaching solution to leach zirconium sulfate; dissolving the zirconium sulfate in the water and purifying; neutralizing the zirconium hydroxide with alkali and precipitating; calcining the zirconium hydroxide to obtain zirconia; precipitating zirconium mother liquor to produce by-product of ammonium sulfate; neutralizing yttrium rich mother liquor and precipitating to obtain yttrium; dissolving yttrium rich residue with acid and purifying; precipitating oxalate to obtain yttrium oxalate; calcining to obtain the yttria. The method has the advantages of effectively separating the yttria from the zirconia in stable zirconia solid solution waste with optional yttrium ion under low temperature condition, changing the zirconia solid solution waste into valuables and utilizing the resources.

Description

1. Technical field [0001] The present invention relates to a process for the recovery of zirconia and yttria from yttria stabilized zirconia solid solution waste, in particular a solid solution waste from yttria stabilized cubic zirconia gemstones and yttria partially stabilized zirconia A method for recovering zirconia and yttrium oxide from waste objects of high-quality grinding bodies and zirconian tools. 2. Background technology [0002] The existing production methods of zirconia and zirconium series compounds all use zircon sand concentrate or baddeleyite as raw materials, and are prepared by sintering and decomposition of alkali or alkaline earth metal oxides, carbonation and chlorination, and plasma thermal decomposition. , and yttrium oxide is obtained from a series of smelting processes such as enrichment of rare earth minerals, grouping and separation of rare earth components, and removal of non-rare earth elements. No matter which process is used to produce zirc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02C01F17/00
Inventor 李树昌宋兴华
Owner SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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