Method for producing zinc oxide from low-grade zinc-containing mineral

A zinc oxide, low-grade technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems that the auxiliary materials cannot be recycled, the consumption of refractory materials is large, and the process flow is complicated. Simple process effect

Active Publication Date: 2013-06-12
TANGSHAN HAIGANG HEYUAN ZINC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Existing zinc oxide requires a large amount of raw materials and high requirements for raw materials during preparation, the roasting temperature during sulfation roasting is high, the consumption of refractory materials is large, and the process is difficult to control. In the process of producing zinc sulfate, there are one stage, two stages, The three-stage leaching is divided into low temperature and high temperature, weak acid and strong acid, and normal pressure and high pressure in the leaching conditions. The process is complex and requires complex equipment; the production process has sewage discharge, pollutes the environment, and auxiliary materials cannot be recycled. , wasting a lot of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] 1. Mix 250g of zinc-containing ore powder with 100g of ammonium sulfate, roast at 450°C-500°C for one hour, and recover 235ml of ammonia water with a content of 11.2%. Adding the roasted material directly into 3000ml of water can raise the temperature of the mixed solution to 90°C-100°C. The mixed solution is stirred and reacted for 1 hour, and filtered to obtain 2762ml of leaching solution containing 55.3g / l of zinc sulfate. The recovery rate It was 82.22%.

[0055] 2, with the 2762ml leaching solution that obtains in step 1, add and contain NH It is 12.1% to reclaim ammoniacal liquor 50ml, filter and obtain jarosite precipitation 67.75g, and the iron-containing of initial purified solution is 1.4g / l.

[0056] 3. Add 500ml of 30% hydrogen peroxide to the primary purification solution in step 2, add 0.3g of zinc oxide to adjust the pH value to 5.2, and keep it warm for 30 minutes. The obtained secondary purification solution contains 8000ppm of iron.

[0057] 4. Add 0....

Embodiment 7

[0061] 7. Add 0.1 g of potassium permanganate to 563 ml of the solution obtained in step 6, heat at 50° C., stir and react for 30 minutes, and filter to obtain 551 ml of a solution containing 7 ppm iron.

Embodiment 8

[0063] 8. Add 1.5 g of zinc powder to the 551 ml solution obtained in step 7, heat it at 50° C., stir and react for 1 hour, and filter to obtain 541 ml of a solution containing 11 ppm lead.

[0064] 9. Put 221ml of the purification solution in step 8 in a 1000ml beaker, stir, slowly add 2496ml of the purification solution obtained in Example 5, continue stirring for 20 minutes after the addition, filter, and rinse to obtain an ammonium sulfate solution 3320ml, wash filter mud with distilled water, dry filter mud, obtain basic zinc carbonate 251.2g.

[0065] 10. Evaporate and crystallize the 3320ml ammonium sulfate solution in step 9 to obtain 130g ammonium sulfate crystals.

[0066] 11. Calcining the basic zinc carbonate in step 9 at 1100° C. for two hours to obtain 180 g of zinc oxide, the purity of zinc oxide is 99.78%, D50=23nm.

[0067] In this specific embodiment, raw materials come from a wide range of sources, and the production process of zinc sulfate is neutral leach...

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Abstract

The invention relates to a technical-grade zinc oxide preparation method and especially relates a method for producing zinc oxide from low-grade zinc-containing mineral. The method comprises the following steps that a zinc-ammonia complex purified liquid is slowly added into a zinc sulfate purified liquid being stirred at a fast speed; the mixture undergoes a reaction at a normal temperature for 20min to produce basic zinc carbonate precipitates and an ammonium sulfate solution; the mixture of the basic zinc carbonate precipitates and the ammonium sulfate solution is filtered so that crude basic zinc carbonate and the ammonium sulfate solution are obtained; the crude basic zinc carbonate is cleaned by distilled water to form qualified basic zinc carbonate; the qualified basic zinc carbonate is dried until water content is in a range of 5 to 15%; and the dried qualified basic zinc carbonate is calcined at a temperature of 1100 DEG C for 2 hours to form zinc oxide. The method adopts the raw materials having wide sources, adopts a neutral leaching process in zinc sulfate production, has simple processes, does not need complex equipment, has a low cost, high product purity and no waste water discharge, realizes auxiliary material recycle, reduces a cost and has environmental benefits.

Description

[0001] Technical field: [0002] The invention relates to a method for preparing industrial-grade zinc oxide, in particular to a method for producing zinc oxide by using low-grade zinc-containing minerals. Background technique: [0003] Zinc oxide is an essential additive in the rubber and tire industry, and can also be used as a vulcanization activator, reinforcing agent and coloring for natural rubber, synthetic rubber and latex. The use of nano zinc oxide in the rubber industry can give full play to the role of vulcanization acceleration and improve the performance of rubber, and its dosage is only 30%-50% of ordinary zinc oxide. [0004] In the chemical industry, zinc oxide is widely used as a catalyst and desulfurizer, such as a catalyst in the synthesis of formaldehyde and a desulfurizer in the synthesis of ammonia. The high surface activity of nano-zinc oxide can improve the selectivity and catalytic efficiency of the catalyst, and has a wide range of potentials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
Inventor 李雅春杨涛
Owner TANGSHAN HAIGANG HEYUAN ZINC IND
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