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Method for reclaiming zirconium oxide and yttrium oxide from zirconium-containing solid waste

A technology of solid waste and zirconia, which is applied in the removal of solid waste, zirconia, chemical instruments and methods, etc., can solve the problems of affecting the ecological environment, high production cost, and large output.

Inactive Publication Date: 2008-01-30
李树昌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the special ore-forming state and the low grade of the original ore, a large amount of ore needs to be mined. First, the concentrate is obtained through beneficiation, and then a series of processes such as acid-base dissolution, separation, purification, concentration, and calcination, resulting in low resource utilization. High production costs and large output of "three wastes" seriously affect the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Crush to -0.175mm waste cubic zirconia powder (containing ZrO 2 74.7%, Y 2 o 3 17.6%, SiO 2 3.4%, Fe 2 o 3 0.96%) mixed with slaked lime powder and calcium chloride at a ratio of 1:0.8:0.12wt%, and put into a kiln for conversion reaction at 1050-1100°C for 6 hours to obtain a sintered material.

[0030] (2) The mother liquor described in (5) and the dilute hydrochloric acid solution recovered by condensation are soaked twice for 1: 2.5 (W / V%) by the solid-to-liquid ratio of the sintered material, each time for 1.5 hours. Concentrate and separate to obtain pickling material and washing liquid.

[0031] (3) Leach the pickling material with the acid solution prepared by concentrated hydrochloric acid and the crystal eluent produced in (5) at 95-105°C, the solid-to-liquid ratio is 1:5, and the time is 45 minutes. Perform solid-liquid separation to obtain zirconium-yttrium clear liquid.

[0032] (4) The above-mentioned clear liquid is concentrated, and the concent...

Embodiment 2

[0039] The sintered material is obtained by the same method as in Example 1, the sintered material is 1:5-6 according to the solid-to-liquid ratio, the concentration of hydrochloric acid is 7.0-7.5Mol / L, and the temperature is leached for 1 hour at 90-95 ° C, and the leaching solution is directly cooled. to room temperature, precipitate zirconium oxychloride crystals, filter and wash with 6.5-7.0Mol / L hydrochloric acid solution to obtain pure zirconium oxychloride crystals, dissolve the crystals with purified water, filter, and neutralize with ammonia water to pH8-9, and let stand for 1- 2 hours, carry out solid-liquid separation to obtain Zr(OH) 4 , Zr(OH) 4 Calcined at 800-850°C for 2-3 hours to obtain high-purity zirconia. Then reclaim yttrium oxide from mother liquor by the method described in Example 1.

[0040] The zirconia product obtained by the technical scheme provided by the embodiment of the present invention 2 contains ZrO 2 ≥99.9%, the recovery rate is 90.40%;...

Embodiment 3

[0042] Crush to -0.175mm waste cubic zirconia powder (containing ZrO27 4 .7%, Y 2 o 3 17.6%, SiO 2 3.4%, Fe 2 o 3 0.96%) with slaked lime powder and calcium chloride according to the ratio of 1:0.8:0.2wt%, mixed evenly, put into the furnace kiln and convert and react at 1150-1200° C. for 4 hours to obtain sintered material.

[0043] All the other method steps are the same as in Example 1.

[0044] The zirconia product obtained by the technical scheme provided by the embodiment of the present invention 3 contains ZrO 2 ≥99.5%, the recovery rate is 91.20%; yttrium oxide contains Y 2 o 3 ≥99.0%, the recovery rate is 89.6%.

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PUM

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Abstract

A method to recycle zirconium oxide and yttrium oxide from solid waste containing zirconium comprises the steps of screening of solid solution waste and milling, adding solvent and latent solvent to the milled powder, sintering and conversion, dipping and washing sinters with dilute acid and removing impurity, leaching of acid pickling materials in high temperature and high acid, concentrating and cooling of leaching liquid containing zirconium and yttrium and precipitation of zirconium oxychloride crystal, purifying and burning the crystal to obtain zirconium oxide, purifying, neutralizing and precipitating mother solution after zirconium is separated out, dissolving and purifying yttrium slug with a large amount of yttrium in acid solution and extracting yttrium oxide. The method of recycling zirconium oxide and yttrium oxide from solid waste containing zirconium is characterized by short technique process, low production cost and high recycling rate of metals, etc., thus effectively realizing the reclamation and the cyclic utilization of the solid waste.

Description

1. Technical field [0001] The invention relates to a method for recovering zirconia and yttrium oxide from solid waste containing zirconium, in particular to a method for recovering zirconia and yttrium oxide from solid waste of yttria-stabilized cubic zirconia (artificial zirconia gem). 2. Technical background [0002] At present, zircon sand or baddeleyite are generally used as raw materials to produce zirconia and zirconium compounds by alkali method, lime method, carbonation chloride method, plasma method and other processes. Yttrium oxide is obtained from rare earth minerals through multi-process and multi-series smelting and processing such as beneficiation and enrichment, group separation of rare earth elements and removal of non-rare earth elements. The products of zirconium and yttrium are all obtained from the inherent mineral resources in nature, no matter which process they are produced in. Due to the special ore-forming state and the low grade of the original o...

Claims

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Application Information

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IPC IPC(8): C01G25/02C01F17/00B09B3/00
Inventor 李树昌宋兴华
Owner 李树昌
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