CN111519039B - Process method for recovering zinc from low-grade zinc oxide ore - Google Patents

Process method for recovering zinc from low-grade zinc oxide ore Download PDF

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CN111519039B
CN111519039B CN202010340045.9A CN202010340045A CN111519039B CN 111519039 B CN111519039 B CN 111519039B CN 202010340045 A CN202010340045 A CN 202010340045A CN 111519039 B CN111519039 B CN 111519039B
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zinc
leaching
zinc oxide
glycine
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CN111519039A (en
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曹亦俊
黄宇坤
范桂侠
彭伟军
李超
李国胜
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Zhengzhou University
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/20—Obtaining zinc otherwise than by distilling
    • C22B19/22—Obtaining zinc otherwise than by distilling with leaching with acids
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/20—Obtaining zinc otherwise than by distilling
    • C22B19/26—Refining solutions containing zinc values, e.g. obtained by leaching zinc ores
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention relates to a process method for recovering zinc from low-grade zinc oxide ores, belongs to the technical field of zinc recovery, and solves the problems of difficult zinc recovery and high cost in the low-grade zinc oxide ores. In the zinc recovery process method, the zinc grade in the low-grade zinc oxide ore is 6.0-35.0%, and the low-grade zinc oxide ore contains at least one alkaline gangue mineral selected from quartz, dolomite, gibbsite, calcite and mica; the process method for recovering zinc comprises the following steps: step 1, grinding ore; step 2, preparing a leaching agent: adjusting the pH value of the glycine leaching agent by adopting an alkaline solution; step 3, leaching: mixing zinc oxide ores to be treated with a glycine leaching agent, and selectively leaching zinc in the zinc oxide ores; step 4, zinc deposition; and step 5, roasting decomposition: and (4) roasting the washed zinc oxalate in a high-temperature roasting furnace to obtain the zinc oxide. The invention can realize the high-efficiency selective leaching and recovery of zinc in the low-grade zinc oxide ore.

Description

Process method for recovering zinc from low-grade zinc oxide ore
Technical Field
The invention belongs to the technical field of zinc recovery, and particularly relates to a process method for recovering zinc from low-grade zinc oxide ores.
Background
With the rapid development of the zinc industry in China, the consumption of zinc is increased year by year. At present, the demand of the industry of China for zinc is difficult to meet only by high-grade zinc sulfide ore resources, the zinc oxide ore resources of China are relatively rich, and the development of the zinc oxide ore is an important measure for guaranteeing the development of the zinc industry of China. However, zinc oxide ore has low grade and complex components, wherein zinc mainly exists in the forms of zinc oxide, calamine, hydrozincite and the like, and gangue mainly comprises alkaline gangue such as calcite, dolomite, quartz, clay and the like.
Shadow of alkaline gangue in low grade zinc oxide oreAnd the enrichment is difficult through the mineral separation technology. At present, the commonly used low-grade zinc oxide ore treatment process comprises the following methods: (1) a vulcanization flotation method: the method comprises the steps of firstly, preselecting and vulcanizing zinc oxide in zinc ore by using a soluble vulcanizing agent, and then, carrying out flotation by using collecting agents such as ethyl xanthate, high-grade xanthate, black lead or fatty acid to obtain high-grade zinc sulfide concentrate, wherein the method is common, but the cost of vulcanization and flotation is high; (2) a leaching method comprises the following steps: converting solid-phase zinc oxide into liquid-phase zinc ions, and extracting zinc from the leachate. Depending on the leaching agent, there are acid leaching and alkaline leaching. The acid leaching method mainly uses sulfuric acid as a leaching agent, and the leached liquid is purified and electrolyzed to produce electrolytic zinc; however, since zinc oxide ore contains a large amount of alkaline gangue, it is leached by sulfuric acid during the leaching process, which not only consumes a large amount of leaching agent, but also causes a large amount of impurities such as calcium, iron, magnesium, silicon, etc. to enter the leachate, resulting in difficult solid-liquid separation and purification of the leachate. The alkaline leaching mainly adopts sodium hydroxide or ammonia water-ammonium salt solution system as leaching agent, utilizes the characteristic that zinc oxide is amphoteric oxide, and leads the zinc oxide and OH in higher alkalinity solution-Combined and transformed into ZnO2 2-The gangue except the silicon oxide does not react with alkali, thereby achieving the aim of selectively leaching zinc; however, the silicon mineral in the minerals forms sodium silicate which enters the leaching solution, the process alkali consumption is high, and the leaching solution cannot be directly electrolyzed to produce zinc due to low zinc content, and zinc sulfide concentrate or zinc oxide concentrate is prepared by sulfide precipitation or hydrolysis precipitation. When ammonia water-ammonium salt is used as a leaching agent, zinc and gangue are separated and enter a leaching solution by utilizing the complex reaction of zinc and ammonium ions, and the selective leaching characteristic is better; however, the ammonia leaching process is easy to cause the distillation tower to scar in the subsequent ammonia distillation treatment process of the leachate, and the energy consumption is high.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a process for recovering zinc from low-grade zinc oxide ore, so as to realize efficient selective leaching and recovery of zinc in low-grade zinc oxide ore.
The purpose of the invention is mainly realized by the following technical scheme:
a process method for recovering zinc from low-grade zinc oxide ores comprises the steps of enabling the zinc grade in the low-grade zinc oxide ores to be 6.0-35.0%, wherein the low-grade zinc oxide ores contain at least one alkaline gangue mineral selected from quartz, dolomite, gibbsite, calcite and mica;
the process method for recovering zinc comprises the following steps:
step 1, grinding: grinding and screening the zinc oxide ore to obtain zinc oxide ore to be treated;
step 2, preparing a leaching agent: the leaching agent is glycine leaching agent, and alkaline solution is adopted to adjust the pH value of the glycine leaching agent;
step 3, leaching: mixing zinc oxide ore to be treated with a glycine leaching agent, selectively leaching zinc in the zinc oxide ore, and filtering to obtain a zinc-containing glycine solution and leaching residues;
step 4, zinc deposition: mixing a zinc-containing glycine solution with an oxalic acid solution for zinc precipitation, and filtering to obtain a zinc oxalate precipitate and a glycine solution;
and step 5, roasting decomposition: washing the zinc oxalate precipitate with deionized water until the pH of the washing liquid is 7-8; and (3) putting the washed zinc oxalate into a high-temperature roasting furnace, and preserving the heat for a certain time at a certain temperature to obtain the zinc oxide.
In one possible design, in step 1, the zinc oxide ore is ground to a particle size of less than 0.074mm, the mass percentage of the zinc oxide ore being more than 90%.
In one possible design, the concentration of the glycine leaching agent in the step 2 is 50-200 g/L.
In a possible design, in the step 2, the pH value of the glycine leaching agent after adjustment is 11-13.
In a possible design, in the step 3, the reaction temperature of the leaching process is 40-90 ℃, the reaction time is 1-24 hours, and the liquid-solid ratio of the leaching agent to the zinc oxide ore is 20: 1-5: 1.
In one possible design, in step 3, mechanical stirring is performed during the mixing and leaching process, and the mechanical stirring speed is 50-300 rpm.
In a possible design, in the step 4, the concentration of the oxalic acid solution is 200-400 g/L, and the precipitation time is 5-20 minutes.
In one possible design, step 4, C in oxalic acid solution and zinc-containing glycine solution2O4 2-With Zn2+The ion ratio is 1-1.5: 1.
In a possible design, in the step 5, the roasting decomposition heat preservation temperature is 400-700 ℃, and the roasting decomposition heat preservation time is 30-120 min.
In one possible design, in step 4, the filtered glycine solution is returned to the leaching process after pH adjustment and impurity removal.
Compared with the prior art, the invention can at least realize one of the following technical effects:
1) according to the technical scheme, the glycine organic acid is used for leaching the low-grade zinc oxide ore for the first time, the pH of the leaching agent is adjusted through the alkaline solution, the leaching process of the low-grade zinc oxide ore is carried out in the alkaline solution, leaching of alkaline gangue in the ore is avoided, separation efficiency of the zinc-containing ore and the alkaline gangue is effectively improved, and a selective leaching effect on the zinc-containing ore is achieved.
2) The invention adjusts the pH value of the zinc-containing glycine leaching solution through the oxalic acid solution, promotes the complex dissociation of zinc ions and glycine, and leads Zn to2+And C2O4 2-Complexing and forming zinc oxalate precipitate so as to achieve the aim of recovering zinc and realize the regeneration of glycine; after the leaching solution is subjected to zinc precipitation, impurities are removed and the pH value is adjusted, so that the leaching solution can be returned to the leaching process for recycling. The method overcomes the defects of complex flotation process, high cost, poor selectivity, large acid consumption and the like in the zinc enrichment process of the low-grade zinc oxide ore in the prior art.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
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The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is a block diagram of the process flow of the present invention.
Detailed Description
A process for recovering zinc from low grade zinc oxide ore is described in further detail below with reference to specific examples, which are provided for purposes of comparison and explanation only and to which the present invention is not limited.
A process method for recovering zinc from low-grade zinc oxide ores, wherein the zinc grade in the low-grade zinc oxide ores is 6.0-35.0%, the low-grade zinc oxide ores contain at least one alkaline gangue mineral selected from quartz, dolomite, gibbsite, calcite and mica, and the process method comprises the following steps as shown in figures 1-2:
step 1, grinding: grinding and screening the zinc oxide ore to obtain zinc oxide ore to be treated;
step 2, preparing a leaching agent: the leaching agent is glycine leaching agent, and alkaline solution is adopted to adjust the pH value of the glycine leaching agent;
step 3, leaching: mixing zinc oxide ore to be treated with a glycine leaching agent, selectively leaching zinc in the zinc oxide ore, and filtering to obtain a zinc-containing glycine solution and leaching residues;
step 4, zinc deposition: and mixing the zinc-containing glycine solution with the oxalic acid solution to precipitate zinc, and filtering to obtain zinc oxalate precipitate and a glycine solution.
And step 5, roasting decomposition: washing the zinc oxalate precipitate with deionized water until the pH of the washing liquid is 7-8; and (3) putting the washed zinc oxalate into a high-temperature roasting furnace, and preserving the heat for a certain time at a certain temperature to obtain the zinc oxide.
In the technical scheme of the invention, the glycine organic acid is used for leaching the low-grade zinc oxide ore for the first time, and the pH of the leaching agent is adjusted by the alkaline solution to ensure that the low-grade zinc oxide ore is leachedThe process is carried out in an alkaline solution, so that leaching of alkaline gangue in minerals is avoided, the separation efficiency of zinc-containing minerals and the alkaline gangue is effectively improved, and the selective leaching effect of the zinc-containing minerals is achieved; the pH value of the zinc-containing glycine leaching solution is adjusted by oxalic acid solution to promote the complex dissociation of zinc ions and glycine and lead Zn to2+And C2O4 2-Complexing to form zinc oxalate precipitate, thereby achieving the aim of recovering zinc and promoting the regeneration of glycine; after the leaching solution is subjected to zinc precipitation, impurities are removed and the pH value is adjusted, so that the leaching solution can be returned to the leaching process for recycling. The method overcomes the defects of complex flotation process, high cost, poor selectivity, large acid consumption and the like in the zinc enrichment process of the low-grade zinc oxide ore in the prior art.
Specifically, in the step 1, the zinc oxide ore is ground until the mass percentage of the zinc oxide ore with the granularity less than 0.074mm accounts for more than 90%. Such particle size can make zinc-containing oxidized mineral monomer fully dissociate, which is beneficial to full leaching. The particle size is too large to facilitate subsequent leaching; the granularity is too small, which is not beneficial to the filtration and separation of the leaching liquid and the leaching slag.
Specifically, in the step 2, the concentration of the glycine leaching agent is 50-200 g/L. The selectivity of the zinc complex leaching is weakened and the leaching agent is wasted due to the overlarge concentration of the glycine leaching agent; because the zinc leaching is incomplete due to too low concentration, the concentration of the glycine leaching agent in the preferable scheme is 50-200 g/L.
And part of impurity metal elements are dissolved into the solution due to the fact that the pH value is too large, and hydroxide precipitation formed by hydrolysis of zinc ions is difficult to avoid if the pH value is too small, so that the pH value of the glycine leaching agent is 11-13 after adjustment.
For example, in step 2, the alkaline solution may be a sodium hydroxide solution or a potassium hydroxide solution.
Specifically, in the step 3, the reaction temperature of the leaching process is 40-90 ℃, the reaction time is 1-24 hours, and the liquid-solid ratio of the leaching agent to the zinc oxide ore is 20: 1-5: 1. Too high liquid-solid ratio can cause low leaching efficiency and waste of leaching agent, and too low liquid-solid ratio can cause high viscosity, poor dispersibility and incomplete leaching of a leaching system.
Specifically, in the step 3, mechanical stirring is performed in the mixing and leaching process, and the mechanical stirring speed is 50-300 revolutions per minute.
Specifically, in the step 4, the concentration of the oxalic acid solution is 200-400 g/L, and the precipitation time is 5-20 minutes. C in solution after oxalic acid solution and zinc-containing glycine solution are mixed2O4 2-With Zn2+The ion ratio is 1-1.5: 1. The concentration of the oxalic acid solution is too high, and C in the solution is not easy to adjust2O4 2-With Zn2+When the ion ratio is too low, excessive zinc precipitation wastewater can be generated, so that the concentration of the oxalic acid solution is controlled to be 200-400 g/L; in solution C2O4 2-With Zn2+Too large ion ratio of (A) causes waste of oxalic acid solution, too small results in incomplete zinc deposition, thus controlling C2O4 2-With Zn2+The ion ratio of (A) is 1-1.5: 1; the zinc deposition time is controlled to be 5-20 min because the zinc deposition time is too long and can cause the aggregation and growth of zinc oxalate particles, and the zinc deposition time is too short and can cause incomplete zinc deposition.
Specifically, in the step 4, the glycine solution obtained by filtering is returned to the leaching process after the pH value is adjusted and impurities are removed. The glycine solution is recycled, so that the production cost caused by the glycine used as a leaching agent in the technology can be reduced.
Specifically, in the step 5, the roasting decomposition temperature of zinc oxalate is too high, the roasting time is too long, particles are sintered and agglomerated to increase the particle size, and the roasting decomposition temperature is too low, the roasting time is controlled to be 30-120 min, so that the zinc oxalate is incompletely decomposed.
The working principle of the invention is as follows:
and (3) leaching:
ZnO+2NH2CH2COOH＝Zn(NH2CH2COO)2+H2O
and (3) zinc precipitation process:
Zn(NH2CH2COO)2+H2C2O4＝ZnC2O4+2NH2CH2COOH
roasting and decomposing:
Figure BDA0002468070940000071
compared with the prior art, the invention has the beneficial technical effects that: the invention uses the organic acid glycine as a leaching agent for treating the low-grade zinc oxide ore for the first time, and the pH value of the solution of the leaching agent is adjusted to be alkaline, thereby being beneficial to the complexation of zinc ions and the glycine. In the alkaline leaching process, the leaching of alkaline gangue in minerals is effectively avoided, the separation effect of zinc-containing minerals and gangue is improved, and the separation of zinc and other impurity elements is facilitated; the pH value of the zinc-containing glycine leaching solution is adjusted by oxalic acid solution to promote the complex dissociation of zinc ions and glycine and lead Zn to2+And C2O4 2-Then zinc oxalate precipitate is formed by complexation, thereby achieving the purpose of recovering zinc and promoting the regeneration of glycine. The technical scheme of the invention has the advantages of simple process, high zinc leaching rate, common leaching agent and no pollution, greatly reduces the consumption of the leaching agent, reduces the production cost, has short leaching time and improves the economic benefit compared with the prior leaching technology.
Example 1
The low grade zinc oxide ore contains 6.0% of zinc, and contains alkaline gangue such as quartz, dolomite, calcite, etc.
(1) Ore grinding and leaching agent preparation: crushing, grinding and screening the zinc oxide ore until the mass of the ore with the granularity less than 0.074mm accounts for 70 percent; preparing a glycine leaching agent with the concentration of 50g/L, and adjusting the pH value of the leaching agent solution to 11 by adopting a sodium hydroxide solution;
(2) leaching: mixing the prepared glycine leaching agent and zinc oxide minerals according to a liquid-solid ratio of 5:1, heating to 40 ℃, and leaching for 1 hour under mechanical stirring at 50 revolutions per minute, wherein the leaching rate of zinc reaches 50%; filtering the leached ore pulp by adopting a plate-and-frame filtering device to obtain a zinc-containing leaching solution and leaching residues;
(3) and (3) zinc precipitation: neutralizing the zinc-containing leachate with 200g/L oxalic acid solution, wherein the addition amount of the oxalic acid solution is ensuredIn the solution C2O4 2-With Zn2+The ion ratio is 1:1, the precipitation time is 5min, and the zinc precipitation rate is more than 80%;
(4) roasting and decomposing: and (3) washing the zinc oxalate precipitate, then putting the zinc oxalate precipitate into a high-temperature roasting furnace for heating decomposition at the constant temperature of 400 ℃ for 30min, wherein the decomposition rate of the zinc oxalate is more than 85%, and the purity of the obtained zinc oxide is more than 80%.
Example 2
The low grade zinc oxide ore contains zinc 10.0%, and contains alkaline gangue such as quartz, gibbsite, and calcite.
(1) Ore grinding and leaching agent preparation: crushing, grinding and screening the zinc oxide ore until the mass of the ore with the granularity less than 0.074mm accounts for 80 percent; preparing a glycine leaching agent with the concentration of 100g/L, and adjusting the pH value of the leaching agent solution to 12 by adopting a sodium hydroxide solution;
(2) leaching: mixing the prepared glycine leaching agent and zinc oxide minerals according to a liquid-solid ratio of 10:1, heating to 60 ℃, and leaching for 5 hours under the mechanical stirring of 100 revolutions per minute, wherein the leaching rate of zinc reaches 70%; filtering the leached ore pulp by adopting a plate-and-frame filtering device to obtain a zinc-containing leaching solution and leaching residues;
(3) and (3) zinc precipitation: neutralizing the zinc-containing leachate with 250g/L oxalic acid solution, wherein the addition amount of the oxalic acid solution ensures C in the solution2O4 2-With Zn2+The ion ratio is 1.2:1, the precipitation time is 10min, and the zinc precipitation rate is more than 90%;
(4) roasting and decomposing: and (3) washing the zinc oxalate precipitate, then putting the zinc oxalate precipitate into a high-temperature roasting furnace for heating decomposition at the constant temperature of 500 ℃ for 60min, wherein the decomposition rate of the zinc oxalate is over 90 percent, and the purity of the obtained zinc oxide is over 85 percent.
Example 3
The low grade zinc oxide ore contains zinc of 20.0%, and alkaline gangue such as quartz, dolomite, and mica.
(1) Ore grinding and leaching agent preparation: crushing, grinding and screening the zinc oxide ore until the mass of the ore with the granularity less than 0.074mm accounts for 85 percent; preparing a glycine leaching agent with the concentration of 150g/L, and adjusting the pH value of the leaching agent solution to 12.5 by adopting an ammonia water solution;
(2) leaching: mixing the prepared glycine leaching agent with zinc oxide minerals according to a liquid-solid ratio of 15:1, heating to 70 ℃, and leaching for 10 hours under mechanical stirring at 150 revolutions per minute, wherein the leaching rate of zinc reaches 75%; filtering the leached ore pulp by adopting a plate-and-frame filtering device to obtain a zinc-containing leaching solution and leaching residues;
(3) and (3) zinc precipitation: neutralizing the zinc-containing leachate with 300g/L oxalic acid solution, wherein the addition amount of the oxalic acid solution ensures C in the solution2O4 2-With Zn2+The ion ratio is 1.4:1, the precipitation time is 15min, and the zinc precipitation rate is more than 95%;
(5) roasting and decomposing: and (3) washing the zinc oxalate precipitate, then putting the zinc oxalate precipitate into a high-temperature roasting furnace for heating decomposition at the constant temperature of 600 ℃ for 90min, wherein the decomposition rate of the zinc oxalate is over 95 percent, and the purity of the obtained zinc oxide is over 95 percent.
Example 4
The low grade zinc oxide ore contains 35.0% of zinc, and contains alkaline gangue such as quartz, dolomite, calcite, gibbsite and mica.
(1) Ore grinding and leaching agent preparation: crushing, grinding and screening the zinc oxide ore until the mass of the ore with the granularity less than 0.074mm accounts for 95 percent; preparing a glycine leaching agent with the concentration of 200g/L, and adjusting the pH value of a leaching agent solution to 13 by adopting a potassium hydroxide solution;
(2) leaching: mixing the prepared glycine leaching agent with zinc oxide minerals according to a liquid-solid ratio of 20:1, heating to 90 ℃, and leaching for 24 hours under the mechanical stirring of 300 revolutions per minute, wherein the leaching rate of zinc reaches 95%; filtering the leached ore pulp by adopting a plate-and-frame filtering device to obtain a zinc-containing leaching solution and leaching residues;
(3) and (3) zinc precipitation: neutralizing the zinc-containing leachate with 400g/L oxalic acid solution, wherein the addition amount of the oxalic acid solution ensures C in the solution2O4 2-With Zn2+The ion ratio is 1.5:1, the precipitation time is 20min, and the zinc precipitation rate is more than 98%;
(5) roasting and decomposing: and (3) washing the zinc oxalate precipitate, then putting the zinc oxalate precipitate into a high-temperature roasting furnace for heating decomposition at the constant temperature of 700 ℃ for 120min, wherein the decomposition rate of the zinc oxalate is over 98 percent, and the purity of the obtained zinc oxide is over 98 percent.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims (4)

1. The process method for recovering zinc from the low-grade zinc oxide ore is characterized in that the zinc grade in the low-grade zinc oxide ore is 6.0-35.0%, and the low-grade zinc oxide ore contains at least one alkaline gangue mineral selected from quartz, dolomite, gibbsite, calcite and mica;
the process method for recovering zinc comprises the following steps:
step 1, grinding: grinding and screening the zinc oxide ore to obtain zinc oxide ore to be treated;
step 2, preparing a leaching agent: the leaching agent is glycine leaching agent, and alkaline solution is adopted to adjust the pH value of the glycine leaching agent;
step 3, leaching: mixing the zinc oxide ore to be treated with a glycine leaching agent, selectively leaching zinc in the zinc oxide ore, and filtering to obtain a zinc-containing glycine solution and leaching residues;
step 4, zinc deposition: mixing the zinc-containing glycine solution with an oxalic acid solution for zinc precipitation, and filtering to obtain a zinc oxalate precipitate and a glycine solution, so as to realize the cyclic utilization of a leaching agent glycine solution;
and step 5, roasting decomposition: washing the zinc oxalate precipitate with deionized water until the pH of a washing liquid is 7-8; putting the washed zinc oxalate into a high-temperature roasting furnace, and preserving the heat for a certain time at a certain temperature to obtain zinc oxide;
in the step 2, the concentration of the glycine leaching agent is 50-200 g/L, and the pH value of the adjusted glycine leaching agent is 13;
in the step 3, the reaction temperature of the leaching process is 40-90 ℃, the reaction time is 1-24 hours, and the liquid-solid ratio of the leaching agent to the zinc oxide ore is 20: 1-5: 1;
in the step 3, mechanical stirring is carried out in the mixing and leaching process, and the mechanical stirring speed is 50-300 revolutions per minute;
in the step 4, the concentration of an oxalic acid solution is 200-400 g/L, the precipitation time is 5-20 minutes, and C in the oxalic acid solution and the zinc-containing glycine solution2O4 2-With Zn2+The ion ratio is 1-1.5: 1.
2. The process according to claim 1, wherein in step 1, the zinc oxide ore is ground to a particle size of less than 0.074mm, and the mass percentage of the zinc oxide ore is more than 90%.
3. The process method for recovering zinc from low-grade zinc oxide ores according to claim 1 or 2, wherein in the step 5, the roasting decomposition heat preservation temperature is 400-700 ℃, and the roasting decomposition heat preservation time is 30-120 min.
4. The process method for recovering zinc from low-grade zinc oxide ores according to claim 1 or 2, wherein the glycine solution obtained by filtering in the step 4 is returned to the leaching process after pH adjustment and impurity removal.
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An Alkaline Glycine‑Based Leach Process of Base and Precious Metals;Elsayed A.Oraby等;《Waste and Biomass Valorization》;20190809;第3897-3909页 *
An investigation into the leaching behaviour of copper oxide minerals in aqueous alkaline glycine solutions;B.C. Tanda等;《Hydrometallurg》;20161205;第153-162页 *

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