CN-118684489-B - Method for producing high-purity zirconia by using zirconium-containing reclaimed material

CN118684489BCN 118684489 BCN118684489 BCN 118684489BCN-118684489-B

Abstract

The invention relates to a method for producing high-purity zirconia by using a zirconium-containing reclaimed material, which comprises the following steps of S1 smelting, namely mixing the zirconium-containing reclaimed material with quartz sand or sodium carbonate, wherein the mixing proportion of the quartz sand is 5-30%, and the mixing proportion of the sodium carbonate is 10-40%, and smelting is carried out in an oxidizing atmosphere. The method for producing high-purity zirconia by using the zirconium-containing reclaimed material comprises the steps of using the zirconium-containing reclaimed material or zircon sand with the impurity content meeting the requirement as a raw material, adding a smelting auxiliary agent, smelting in an electric arc furnace, including but not limited to ball forming by injection, alkali dissolution and decomposition, alkali filtration, alkali washing, acid washing, water washing, filtering and finally drying to obtain zirconia powder with the ZrO 2 content of more than or equal to 99 percent.

Inventors

WEI SHUANG
CHENG SHIZHONG
CHU XUEJI

Assignees

三祥新材股份有限公司

Dates

Publication Date: 20260508
Application Date: 20230322

Claims (3)

1. A method for producing high-purity zirconia by using a zirconium-containing reclaimed material is characterized by comprising the following steps: s1, smelting, namely mixing the zirconium-containing reclaimed material with quartz sand or sodium carbonate, wherein the mixing proportion of the quartz sand is 5-30%, and the mixing proportion of the sodium carbonate is 10-40%, smelting in an oxidizing atmosphere for 100-120 minutes, and blowing the mixture into balls after smelting is finished, and adopting compressed air or a high-pressure blower; S2, alkali dissolution, namely, alkali dissolution reaction is carried out on the spherical product and alkali solution with the concentration of 10-30% in a closed reaction kettle at the temperature of 100-130 ℃; S3, filtering alkali, namely filtering the alkali-dissolved solution in a filter pressing mode; s4, washing alkali, namely washing the solid phase after alkali filtration for 1-3 times to further remove dissolved impurities and alkali liquor; S5, acid washing, namely acid washing the solid phase after alkali washing by using dilute sulfuric acid or dilute hydrochloric acid; s6, washing with water to remove soluble metal ions; S7, drying, namely removing water in the solid phase to obtain zirconia powder with ZrO 2 content more than or equal to 99%; The zirconium-containing reclaimed material comprises defective products or leftovers of zirconia ceramic products, grinding materials generated by processing zirconia artificial diamonds and dust removal powder generated during the production of zirconia material raw materials.
2. A method for producing high purity zirconia using a zirconia containing recycle as claimed in claim 1 wherein: The alkali liquor is aqueous solution of NaOH or KOH.
3. A process for producing high purity zirconia by using a zirconia containing recycle as set forth in claim 1 wherein the smelting apparatus is a three-phase or DC arc furnace having a power of 800 to 4000W.

Description

Method for producing high-purity zirconia by using zirconium-containing reclaimed material Technical Field The invention relates to the technical field of high-purity zirconia production, in particular to a method for producing high-purity zirconia by using a zirconia-containing reclaimed material. Background Zirconium oxide is generally zirconium dioxide, the molecular formula is ZrO 2, and the zirconium oxide is divided into chemical zirconium oxide and electric smelting zirconium oxide according to different production processes, wherein the chemical zirconium oxide has the advantages of low impurity content, high activity and the like, but the production process is complex, a large amount of water resources are consumed, the comprehensive production cost is high, certain pollution is caused to the environment, and the electric smelting method has the advantages of high comprehensive cost, but the electric smelting method can only reduce and separate SiO 2 in zircon sand, and cannot remove other impurities, so that the application is limited to a certain extent. Zirconia is widely used in industrial fields, and the main applications include fields such as ceramic color glazes, advanced refractory products, ceramic brake pad additives, artificial diamonds, zirconium sponge, special ceramic products, thermal barrier coatings and the like. In the two production processes, the raw materials used are imported high-grade zircon sand with ZrO 2 content more than or equal to 66%, and the supply chain is basically mastered in the international companies such as Lituo, tenuo, ai Luka and the like, and most of domestic companies participate in competition in the aspect of low-grade and low-added-value products. China is the largest country of production and use of zirconia worldwide, and is also the largest country of export of zirconium materials. A large amount of zircon sand raw materials enter China every year, a large amount of zirconium products are exported abroad, and good supply and demand relations are maintained. In the aspect of zirconia application, a great amount of recovered zirconium-containing products, such as waste products generated during ceramic product production, grinding materials generated during artificial diamond processing, dust removal powder generated during high-grade refractory raw material production, waste products generated after product application and the like, are generated annually, and a new direction is provided for the zirconium raw material. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a method for producing high-purity zirconia by using a zirconia-containing reclaimed material, which has the advantages of high-purity zirconia recovery and the like. In order to achieve the above purpose, the invention provides the following technical scheme that the method for producing the high-purity zirconia by using the zirconia-containing reclaimed material comprises the following steps: s1, smelting, namely mixing the zirconium-containing reclaimed material with quartz sand or sodium carbonate, wherein the mixing proportion of the quartz sand is 5-30%, and the mixing proportion of the sodium carbonate is 10-40%, smelting in an oxidizing atmosphere for 100-120 minutes, and blowing the mixture into balls after smelting is finished, and adopting compressed air or a high-pressure blower; S2, alkali dissolution, namely, alkali dissolution reaction is carried out on the spherical product and alkali solution with the concentration of 10-30% in a closed reaction kettle at the temperature of 100-130 ℃; S3, filtering alkali, namely filtering the alkali-dissolved solution in a filter pressing mode; s4, washing alkali, namely washing the solid phase after alkali filtration for 1-3 times to further remove dissolved impurities and alkali liquor; S5, acid washing, namely acid washing the solid phase after alkali washing by using dilute sulfuric acid or dilute hydrochloric acid; s6, washing with water to remove soluble metal ions; s7, drying, namely removing water in the solid phase to obtain zirconia powder with ZrO2 content more than or equal to 99%; The zirconium-containing reclaimed material comprises defective products or leftovers of zirconia ceramic products, grinding materials generated by processing zirconia artificial diamonds and dust removal powder generated during the production of zirconia material raw materials. Further, the alkali solution is an aqueous solution of NaOH or KOH. Further, the smelting equipment is a three-phase or direct current arc furnace with power of 800-4000W. Compared with the prior art, the technical scheme of the application has the following beneficial effects: 1. The method for producing high-purity zirconia by using the zirconium-containing reclaimed material comprises the steps of using the zirconium-containing reclaimed material or zircon sand with the impurity content meeting the requirement as a raw material, ad