Cyclic utilization method of zirconium oxide crystal processing waste powdery material

A technology of zirconia powder and zirconia, which is applied in the field of zirconia crystal processing waste powder recycling, can solve the problems of difficult governance, waste of resources, complex production process, etc., and achieve good social benefits, easy operation control, and technological process simple effect

Pending Publication Date: 2019-03-12
四川建志科技有限责任公司
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  • Abstract
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Problems solved by technology

However, the finished product rate of its processing into gem ornaments is low, and more than 6,000 tons of zirconia waste powder containing zirconium and yttrium will be produced in the process of processing gems every year. For a long time, the waste powder has been mixed with It is mixed with impurities from cutting and grinding tools, as well as surface debris, etc., and it is difficult to re-draw new high-purity zirconia crystals. It can only be used to produce low-value-added products such as ceramics, and there are also complex crystals such as high-temperature alkali melting. technology to produce products such as zirconium oxychloride, zirconium sulfate, zirconium carbonate and zirconium dioxide, such as patent CN1986423A and patent CN103950977A, etc., but these methods have a common feature, that is, when removing SiO2 during high-temperature alkali fusion, only The zirconia in the zirconia crystal processing waste powder can be recovered, and the yttrium oxide in it is separated to produce a waste residue containing yttrium oxide, and the complete recycling of zirconia and yttrium oxide in the zirconia crystal processing waste powder is not realized
caused a lot of waste of resources
Moreover, the production process of this technology is complicated, the process is long, the energy consumption is high, and the amount of auxiliary materials is large. It needs to melt the processed waste powder with solid caustic soda under the condition of 700-850 ° C, and then convert it with sulfuric acid and leaching it with hydrochloric acid. , demanding equipment conditions
At the same time, it needs to consume a large amount of sulfuric acid and hydrochloric acid, and produce a large amount of waste acid, strongly acidic waste residue and acid gas that are difficult to effectively use the mixture of hydrochloric acid and sulfuric acid. Benefits and application prospects are very worrying

Method used

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  • Cyclic utilization method of zirconium oxide crystal processing waste powdery material

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Experimental program
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Effect test

Embodiment 1

[0034] (1) 1000kg of zirconia crystal processing waste powder (water content 10.28%, SiO 2 Content 1650ppm, Fe 2 o 3 620ppm, Al 2 o 3 285ppm, MgO130ppm); firstly, through sieving and magnetic separation to remove mechanical impurities and magnetic substances.

[0035] (2) Add the material after removing mechanical impurities and magnetic substances in step (1) into the caustic washing reaction kettle according to the solid-to-liquid ratio (ratio of material to sodium hydroxide solution) 1:2.5, control the temperature at 100°C, and add sodium hydroxide Under the condition of solution concentration of 12%, heating and washing for 12 hours, the SiO in the slurry 2 The content is 93ppm; then the slurry is filtered to obtain an alkali-washed filter cake and a sodium hydroxide filtrate.

[0036] (3) Put the alkali-washed filter cake into the pickling reaction kettle according to the solid-to-liquid ratio (the ratio of alkali-washed filter cake to sulfuric acid solution) 1:2.5, ...

Embodiment 2

[0041] (1) 1000kg of zirconia crystal processing waste powder (water content 12.56%, SiO 2 Content 1350ppm, Fe 2 o 3 510ppm, Al 2 o 3 305ppm, MgO157ppm); firstly, through sieving and magnetic separation to remove mechanical impurities and magnetic substances;

[0042] (2) Add the material after removing mechanical impurities and magnetic substances into the caustic washing reaction kettle at a solid-to-liquid ratio of 1:3.0, and heat and wash it for 10 hours under the conditions of controlling the temperature at 95°C and the concentration of sodium hydroxide solution at 15%. SiO in slurry 2 The content is 89ppm; then the slurry is filtered to obtain an alkali-washed filter cake and a sodium hydroxide filtrate.

[0043] (3) Add the alkali-washed filter cake into the pickling reaction kettle at a solid-to-liquid ratio of 1:3.0, and wash it for 10 hours under the conditions of controlling the temperature at 100°C and sulfuric acid concentration of 30%, and analyzing Fe in th...

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Abstract

The invention discloses a cyclic utilization method of a zirconium oxide crystal processing waste powdery material, and particularly relates to a new cyclic utilization method which utilizes and meltsdown a mixture of zirconium oxide and yttrium oxide obtained through refining of zirconium oxide crystal processing waste powdery material to directly produce zirconium oxide crystals. The method comprises the following steps that firstly zirconium oxide crystal processing waste powdery material is subjected to magnetic separation so as to remove magnetic substances, then washed with a sodium hydroxide solution so as to remove silicon, washed with acid (sulfuric acid, nitric acid or hydrochloric acid) so as to remove iron after being filtered, then washed with purified water to remove the residual acid after being filtered, and then calcinated to obtain the gemdiamond-level high-purity zirconium oxide powdery material, the powdery material is added into a high frequency furnace again to be molten down and crystal pulled, and the zirconium oxide crystal product is produced. The method realizes the purpose that the zirconium oxide crystal processing waste powdery material is cyclicallyutilized to produce the zirconium oxide crystals again.

Description

technical field [0001] The invention relates to the technical field of industrialization of renewable resources, in particular to the recycling technology of zirconia crystal processing waste powder. Background technique [0002] Artificial synthesis of high-purity zirconia crystals (artificial gemstones) is made by adding a certain amount of stabilizer yttrium oxide to high-purity zirconia powder, melting and pulling crystals in a high-frequency furnace at a temperature of 2800-3000°C Cubic zirconia crystals (man-made gemstones), which have properties very similar to real diamonds, are often called "artificial gemstones" and are widely used as diamond substitutes. [0003] In my country, after decades of development, the industrial processing volume of high-purity zirconia crystals (man-made gemstones) in Wuzhou, Guangxi once accounted for 95% of the domestic and 85% of the world. According to incomplete statistics, the artificial gem industry in Wuzhou consumes more than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/16C30B15/00C01G25/02C01G25/00C01G25/06
CPCC01G25/00C01G25/02C01G25/06C30B15/00C30B29/16
Inventor 曾宪金胡伟
Owner 四川建志科技有限责任公司
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