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Method for processing zinc oxide ore or zinc oxide secondary resource to prepare superfine active zinc oxide

A technology of activated zinc oxide and secondary resources, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve problems such as ineffective treatment, and achieve the effects of reducing the discharge pressure of three wastes, reducing production processes, and increasing surface area

Inactive Publication Date: 2013-03-20
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For low-grade zinc oxide ore, traditional metallurgical and mineral processing methods cannot be effectively processed

Method used

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  • Method for processing zinc oxide ore or zinc oxide secondary resource to prepare superfine active zinc oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: Zinc oxide composition (%): Zn 19.51, Fe 13.51, Pb 2.30, Cu 0.022, Cd 0.23, S 2.10, As0.098, Sb 0.20, SiO 2 13.78, Al 2 o 3 0.46, CaO 9.31, MgO 0.33, MnO 0.93.

[0046] Prepare first [NH 4 Cl]=5mol / L, [NH 3 ]=5mol / L of leaching agent 1L, weigh 250g of zinc oxide ore, the liquid-solid volume mass ratio is 4:1, at 25°C, leaching for 1h, washing the leaching residue with the same solution as the leaching agent composition when filtering, washing liquid The amount is based on keeping the leachate volume the same as that of the leaching agent. The zinc leaching rate is 83.67%, and the Zn content is 40.81g / L. The leach solution is used as the leaching agent, and then 250g of zinc oxide ore is leached under the same conditions, filtered and washed, incorporated into the lotion, to obtain the second leach solution, the leach solution contains Zn content of 81.25g / L, and the leaching rate reaches 82.93%. The leach solution composition ( g / L): Zn 81.25, Pb 0.8,...

Embodiment 2

[0047] Embodiment 2: zinc oxide ore composition (%): Zn 4.94, Pb 1.74, Cu 0.01, Fe 13.53, Cd 0.29, Co 0.038.

[0048] Prepare first [(NH 4 ) 2 CO 3 ]=2.5mol / L, [NH 3 ] = 5mol / L of leaching agent 1L, weigh 500g of zinc oxide ore, liquid-solid volume mass ratio 2:1, at 35°C, leaching for 1h, after being incorporated into the washing liquid, the volume of the leachate is the same as that of the leachate, and the leachate contains 21.33% zinc g / L; use this leaching solution as a leaching agent, and then leach 500g of zinc oxide ore under the same conditions, and the zinc content in the second leaching solution increases to 42.41g / L; use the second leaching solution as a leaching agent, and carry out under the same conditions The third cycle of leaching, filtering, washing, and adding lotion to obtain the third leachate 1000ml, zinc concentration increased to 63.47g / L, zinc leaching rate 85.21%, leachate composition (g / L): Zn 63.47, Pb 0.06 , Cu 0.12, Cd 0.71. Add zinc powder ...

Embodiment 3

[0049] Embodiment 3: The raw material is zinc oxide secondary resource, i.e. secondary zinc oxide soot, composition (%): Zn 45.76, Pb 7.45, Cd0.47, Fe4.09, In0.044, Mn0.40, Cu0.072, Ag0 .0044, Cl0.04, F0.84, Sb0.34, As1.28. Prepare first [NH 4 ·HCO 3 ]=2mol / L, [NH 3 ] = 1L of leaching agent of 6mol / L, weigh 250g of zinc oxide soot, the liquid-solid volume mass ratio is 4:1, and leaching for 1h at 20°C. %, leachate composition (g / L): Zn 106.69, Pb 0.45, Cu 0.06, Cd 0.82, As 0.046, Sb 0.0058. Add zinc powder according to 4 times the theoretical amount of zinc powder required to replace Cu, Cd, and Pb, stir for 0.5h, and temperature 50°C. The purified liquid is reacted in a high-efficiency spray dryer to form powder A. The reaction conditions are: inlet temperature 450°C, outlet temperature 280°C, feed rate 50mL / min, feed zinc concentration 100g / L. Part of the basic zinc carbonate has not reacted completely, and the powder A is a mixture of basic zinc carbonate and zinc oxid...

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Abstract

The invention relates to a method for processing zinc oxide ore or zinc oxide secondary resource to prepare superfine active zinc oxide. The method comprises the following steps: ammonium leaching: using zinc oxide ore containing 2-60% of zinc or complex zinc oxide secondary resource as raw material, extracting in an ammonium system coordinately, filtering to remove the residue, wherein the filtrate is applied to the next process; replacement and purification: replacing and purifying the extracted filtrate with zinc powder to eliminate impure elements, and then filtering and removing the residue, wherein the filtrate is applied to the next process; pulverization and drying: decomposing the purified filtrate through high-temperature pulverization to prepare powder A, condensing, spraying and absorbing the tail gas which is then returned to the leaching process to prepare the extracting agent; and toasting: toasting the powder A to obtain superfine active zinc oxide. The purified liquidcan be used for directly preparing even powder through efficient pulverization and drying. The technological process of the method has a circular loop so that a small amount of waste gas and waste water is discharged. The method has a rational tail gas heat exchanger. Ammonia gas is recycled in a condensing manner to prepare the leaching liquid. The rest of the ammonia gas is absorbed through spraying, thereby reducing the discharge pressure of three wastes, namely, waste gas, waste water and industrial residue.

Description

Technical field [0001] The invention relates to a method for preparing zinc oxide, in particular to a method for preparing superfine active zinc oxide by processing zinc oxide ore or zinc oxide secondary resources. Background technique [0002] Active zinc oxide is a widely used chemical raw material. The existing preparation methods mainly include direct precipitation method, homogeneous precipitation method, sol-gel method, microemulsion method, hydrothermal method, alcohol salt hydrolysis method, and solvent evaporation method. Wait. At the same time, my country has extremely rich zinc oxide ore resources, but the proportion of higher grade zinc oxide ore containing Zn≥20% is small. Low-grade zinc oxide ore cannot be effectively treated by traditional metallurgy and mineral processing methods. Contents of the invention [0003] In order to overcome the above disadvantages, the present invention provides a method for processing zinc oxide ore or zinc oxide secondary re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02
Inventor 刘建华王瑞祥梁旭光
Owner JIANGXI UNIV OF SCI & TECH
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