CN111167613A - Method for comprehensively recovering lead and zinc from sulfur concentrate after lead and zinc separation - Google Patents
Method for comprehensively recovering lead and zinc from sulfur concentrate after lead and zinc separation Download PDFInfo
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- CN111167613A CN111167613A CN202010000982.XA CN202010000982A CN111167613A CN 111167613 A CN111167613 A CN 111167613A CN 202010000982 A CN202010000982 A CN 202010000982A CN 111167613 A CN111167613 A CN 111167613A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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Abstract
The invention provides a method for comprehensively recovering lead and zinc from sulfur concentrate after lead and zinc separation. Copper sulfate, ethidium nitrate and xanthate are added into the sulfur concentrate pulp in sequence and stirred. The sulfur concentrate containing high lead and zinc grade (Pb + Zn is more than 10 percent, and S is more than 30 percent) is obtained by once roughing, twice fine concentration and twice scavenging, and is added in a batching manner in lead and zinc smelting, so that lead and zinc in the sulfur concentrate are recycled in subsequent smelting. The process of the invention recovers the residual lead and zinc from the sulfur concentrate after the lead and zinc separation for the first time, and realizes the high-efficiency recovery of the lead and zinc in the sulfur concentrate, thereby improving the comprehensive utilization rate of lead and zinc resources and improving the quality of the sulfur concentrate as a byproduct.
Description
Technical Field
The invention relates to the technical field of mineral separation, in particular to a method for comprehensively recovering lead and zinc from sulfur concentrate after lead and zinc separation.
Background
In the existing lead-zinc sulfide ore dressing industry, the traditional flotation process comprises Pb-Zn-S preferential flotation or preferential flotation lead-zinc-sulfur mixed flotation-zinc-sulfur separation, and in tailings after lead and zinc separation, pyrite is generally recovered by adopting sulfuric acid activation flotation or pyrrhotite is recovered by adopting a high-gradient magnetic separator, but the recovery of lead and zinc in sulfur concentrate in any form is not considered.
Due to the rapid development of the lead, zinc and other metallurgical industries in China, the consumption of high-quality resources is increased, the resources are gradually exhausted, the supply of lead-zinc nonferrous metals cannot meet the requirement of national economic development, and a large amount of lead-zinc concentrate is imported from foreign countries every year. In order to maintain the sustainable development of the lead-zinc industry, the comprehensive utilization rate of non-ferrous metal resources such as lead and zinc must be improved. Therefore, the comprehensive recovery of lead and zinc from the sulfur concentrate obtained after separating lead and zinc from the lead and zinc sulfide ore is very significant.
The comprehensive recovery method of sulfur concentrate with application number 201410685460.2 describes the recovery of valuable metals such as lead, silver and sulfur from sulfur concentrate by wet dilute sulfuric acid leaching. However, the process is complex and long in flow, and is not beneficial to industrial popularization and application.
The invention discloses a recycling method of low-grade lead and zinc in pyrite with application number of 201010245189.2. But the pyrometallurgical process has the defects of long process flow, high energy consumption, complex process, large engineering implementation investment and the like.
The patent with application number 201610950595.6 discloses a flotation method for removing copper, lead and zinc from high-grade sulfur concentrate, which is mainly based on the principle that copper, lead and zinc impurities are separated from the sulfur concentrate by adopting a flotation method, so that the quality of the sulfur concentrate is improved, the high-quality sulfur concentrate can be directly roasted to prepare acid, and tailings after acid preparation can be directly used as high-quality iron concentrate. The patent does not fully consider the problem of the comprehensive recovery of metals such as copper, lead, zinc and the like removed from the sulphur concentrate.
Based on the technical conditions, the lead and zinc contained in the sulfur concentrate produced by part of the lead and zinc sulfide mine at present are high, so that the quality of the sulfur concentrate is not high, and valuable metals such as lead and zinc are lost. If a better process and method can be adopted, lead and zinc in the sulfur concentrate can be effectively recycled and utilized, the quality of the sulfur concentrate can be improved, good economic benefit and environmental benefit can be generated, and the comprehensive utilization rate of lead and zinc resources can be improved.
Disclosure of Invention
The invention aims to provide a method for comprehensively recovering lead and zinc from sulfur concentrate after lead and zinc separation, and aims to solve the technical problem that valuable metals such as lead and zinc are lost due to the fact that the current situation of recovery in any form is not considered in the prior art for lead and zinc in the sulfur concentrate.
The technical scheme of the invention is as follows:
a method for comprehensively recovering lead and zinc from sulfur concentrate after lead and zinc separation comprises the following steps:
a) the raw material is sulfur concentrate pulp, lime is added into the sulfur concentrate pulp, and the steps of grinding and removing the chemical are carried out, so that the sulfur concentrate pulp after the chemical is removed is obtained;
b) then carrying out lead-zinc mixed flotation roughing on the sulfur concentrate pulp after the reagent removal;
c) sequentially adding copper sulfate, ethidium and xanthate in the lead-zinc mixed flotation roughing step and stirring to obtain lead-zinc mixed rough concentrate;
d) carrying out multiple concentration on the lead-zinc mixed rough concentrate to obtain high lead-zinc grade sulfur concentrate (Pb + Zn is more than 10 percent, and S is more than 30 percent); carrying out scavenging on the sulfur concentrate in the groove for multiple times to obtain high-quality sulfur concentrate (S is more than 42%);
e) performing multiple fine selection on the lead-zinc mixed rough concentrate, wherein middlings of each lead-zinc fine selection are returned to the last mineral separation step;
f) and in the multiple scavenging of the sulfur concentrate, the middlings in each scavenging are returned to the last beneficiation step.
The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation comprises the steps of adding 100-500 g/t of copper sulfate in the lead and zinc mixed flotation roughing step, and stirring for 3-5 minutes.
The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation comprises the step of adding the diethyldithiocarbamate and the xanthate in a ratio of 1: 1-3: 1 in the step of lead and zinc mixed flotation roughing, wherein the total dosage of the diethyldithiocarbamate and the xanthate is 20-80 g/t, and the stirring time is 0.5-1.5 minutes.
The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation comprises the following steps of carrying out multiple concentration on lead and zinc mixed rough concentrate twice, namely primary lead and zinc concentration and secondary lead and zinc concentration, wherein middlings in each concentration are returned to the last concentration step in sequence, and no medicament is added in the primary lead and zinc concentration; lime is added in the secondary lead-zinc concentration.
The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation is characterized in that no medicament is added in one lead and zinc concentrate, and the stirring time is 0.5-1.5 minutes; lime is added in secondary lead and zinc selection, and the stirring time is 1-3 minutes.
The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation comprises the steps of carrying out scavenging on the sulfur concentrate for multiple times twice, namely primary sulfur scavenging and secondary sulfur scavenging, wherein middlings of each scavenging are returned to the last beneficiation step, and the ethidium and the xanthate are added in the two sulfur scavenging.
The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation comprises the following steps of adding 10-30 g/t of ethidium, nitrogen and xanthate in two sulfur scavenging processes, and stirring for 0.5-1.5 minutes.
The beneficial effect of the invention is that,
through a simple process flow, the aim is to further recycle the lead and zinc resources in the byproduct sulfur concentrate which is not considered to be effectively utilized aiming at a large amount of sulfur concentrate which is a byproduct after lead and zinc are separated from lead and zinc sulfide ores, so that two sulfur concentrate products are obtained: high lead-zinc grade sulfur concentrate (Pb + Zn >10%, S > 30%) and high quality sulfur concentrate (S > 42%), improve lead-zinc recovery rate of lead-zinc sulfide ore, and improve the quality of sulfur concentrate.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
An embodiment of the method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation is shown in figure 1,
firstly, raw ore is sulfur concentrate ore pulp of a lead-zinc ore dressing plant, lime is added for ore grinding and reagent removal to obtain sulfur concentrate ore pulp after reagent removal, then lead-zinc mixed flotation roughing is directly carried out on the ore pulp, ethidium-nitrogen and butyl xanthate are added in the roughing process to be mixed and used as collecting agents and stirred to obtain lead-zinc mixed rough concentrate;
during the lead-zinc mixed flotation roughing, copper sulfate can be added, and the copper sulfate, the ethidium nitrate and the xanthate are sequentially added, specifically, 100g/t of copper sulfate is added (according to the actual situation, the dosage of the added copper sulfate can be determined to be 100-500 g/t, in another embodiment, the dosage of the added copper sulfate is 500 g/t), and the stirring time is about 4 minutes (according to the actual situation, the stirring time can also be determined to be 3-5 minutes); adding 20g/t of total dosage of ethionine and butyl xanthate, wherein the ratio of the total dosage of ethionine and butyl xanthate is 3:1 (according to the actual situation, the total dosage of ethionine and butyl xanthate added can be 20-80 g/t, the ratio of the total dosage of ethionine and butyl xanthate added is 1: 1-3: 1, in another embodiment, the total dosage of ethionine and butyl xanthate added is 80g/t, the ratio of the total dosage of ethionine and butyl xanthate added is 2: 1), and stirring for about 1 minute (according to the actual situation, the stirring time can be 0.5-1.5 minutes).
Then, carrying out concentration twice on the lead-zinc mixed rough concentrate to obtain high lead-zinc grade sulfur concentrate (Pb + Zn is more than 10 percent, and S is more than 30 percent); and (4) scavenging the sulfur concentrate product in the tank twice to obtain high-quality sulfur concentrate (S > 42%).
The lead-zinc concentration comprises two times, namely a first lead-zinc concentration I and a second lead-zinc concentration II, middlings of each lead-zinc concentration are returned to the last ore dressing step, a small amount of lime is required to be added into the second lead-zinc concentration II to serve as an inhibitor, no medicament is added into the first lead-zinc concentration II, and the stirring time is 1 minute (according to the actual condition, the stirring time can be set to be 0.5-1.5 minutes); lime is added in the secondary concentration, the stirring time is 2 minutes (according to the actual situation, the stirring time can also be set to be 1-3 minutes), and the specific lead and zinc concentration times can be selected according to the needs, such as three times, four times and the like.
The sulfur concentrate scavenging comprises two times, namely a first sulfur scavenging I and a second sulfur scavenging II, the middlings in each scavenging are returned to the last beneficiation step, a small amount of ethionine and butyl xanthate is required to be added in the scavenging as a collecting agent, the total dosage of ethionine and butyl xanthate is 10 g/t (according to the actual situation, the total dosage of the added ethionine and butyl xanthate can be 10-30 g/t, in another embodiment, the total dosage of ethionine and butyl xanthate is 30 g/t), wherein the stirring time of the two scavenging is 1 minute (according to the actual situation, the stirring time can also be 0.5-1.5 minutes), and the specific number of times of sulfur scavenging can also be selected according to the needs, such as three times, four times and the like. And obtaining the tailings which are left after the sulfur scavenging, namely the high-quality sulfur concentrate.
When in use, the method aims at the byproduct-sulfur concentrate obtained after the separation of lead and zinc from a large amount of lead-zinc sulfide ores through a simple process flow, and further recycles the lead and zinc resources in the byproduct-sulfur concentrate which is not considered to be effectively utilized, thereby obtaining two sulfur concentrate products: high lead-zinc grade sulfur concentrate (Pb + Zn >10%, S > 30%) and high quality sulfur concentrate (S > 42%), improve lead-zinc recovery rate of lead-zinc sulfide ore, and improve the quality of sulfur concentrate.
The first embodiment is as follows:
in the first sample, sulfur ore concentrate pulp (Pb: 0.59%, Zn: 0.84%) is added with 5kg/t (for dry ore) of lime for grinding and removing chemicals, and the grinding fineness is-0.043 mm and accounts for 86%. After lime is added for ore grinding and reagent removal, copper sulfate (300g/t), ethionamide and butyl xanthate (the proportion is 1:1, the total dosage is 45 g/t) are sequentially added into ore pulp, and after one-time rough concentration, two-time fine concentration and two-time scavenging, high-lead-zinc-grade sulfur concentrate containing 4.21% of lead, 8.43% of zinc, 30.50% of sulfur and 12.64% of Pb and Zn is obtained, wherein the recovery rate of Pb and Zn is 116.32%; the high quality sulfur concentrate contained 42.28% sulfur. The sulfur concentrate with high lead and zinc grade completely meets the technical index requirements of smelteries on the raw materials, namely, the sulfur content is more than 30 percent, and the Pb + Zn content is more than 10 percent.
The second embodiment is as follows:
and secondly, adding 5kg/t (for dry ore) of lime into sulfur concentrate ore pulp (Pb: 0.65% and Zn: 1.13%) to grind and remove the chemicals, wherein the grinding fineness is-0.043 mm and accounts for 85%. After lime grinding and reagent removal are added, copper sulfate (350g/t), ethionamide and butyl xanthate (the proportion is 1:1, the total dosage is 50g/t) are sequentially added into ore pulp, and after one-time rough concentration, two-time fine concentration and two-time scavenging, high-lead-zinc-grade sulfur concentrate containing 4.95% of lead, 11.19% of zinc, 31.20% of sulfur and 16.14% of Pb + Zn is obtained, wherein the recovery rate of Pb + Zn is 148.38%; the high quality sulfur concentrate contained 43.58% sulfur. The sulfur concentrate with high lead and zinc grade completely meets the technical index requirements of smelteries on the raw materials, namely, the sulfur content is more than 30 percent, and the Pb + Zn content is more than 10 percent.
The third concrete embodiment:
and a third ore sample, namely sulfur concentrate ore pulp (Pb: 0.56 percent and Zn: 0.65 percent), adding 5kg/t (for dry ore) of lime for grinding and removing chemicals, wherein the grinding fineness is-0.043 mm and accounts for 86 percent. After lime grinding and reagent removal are added, copper sulfate (280g/t), ethionamide and butyl xanthate (the proportion is 1:1, the total dosage is 40 g/t) are sequentially added into ore pulp, and after one-time rough concentration, two-time fine concentration and two-time scavenging, high-lead-zinc-grade sulfur concentrate containing 3.27% of lead, 6.94% of zinc, 30.76% of sulfur and 10.21% of Pb and Zn is obtained, wherein the recovery rate of Pb and Zn is 111.84%; the high-quality sulfur concentrate contains 42.09 percent of sulfur. The sulfur concentrate with high lead and zinc grade completely meets the technical index requirements of smelteries on the raw materials, namely, the sulfur content is more than 30 percent, and the Pb + Zn content is more than 10 percent.
The fourth concrete embodiment:
and fourthly, adding 5kg/t (for dry ore) of lime into the sulfur concentrate ore pulp (Pb: 0.81 percent and Zn: 1.19 percent) to grind and remove the chemical, wherein the grinding fineness is-0.043 mm and accounts for 85 percent. After lime grinding and reagent removal are added, copper sulfate (400g/t), ethionamide and butyl xanthate (the proportion is 1:1, the total dosage is 50g/t) are sequentially added into ore pulp, and after one-time rough concentration, two-time fine concentration and two-time scavenging, high-lead-zinc-grade sulfur concentrate containing 6.32% of lead, 10.26% of zinc, 30.10% of sulfur and 16.58% of Pb + Zn is obtained, wherein the recovery rate of Pb + Zn is 163.31%; the high-quality sulfur concentrate contains 42.36 percent of sulfur. The sulfur concentrate with high lead and zinc grade completely meets the technical index requirements of smelteries on the raw materials, namely, the sulfur content is more than 30 percent, and the Pb + Zn content is more than 10 percent.
In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (7)
1. A method for comprehensively recovering lead and zinc from sulfur concentrate after lead and zinc separation is characterized by comprising the following steps:
a) adding lime into the sulfur concentrate pulp and carrying out ore grinding and reagent removal to obtain the sulfur concentrate pulp after reagent removal;
b) then lead-zinc mixed flotation roughing is carried out on the sulfur concentrate pulp after the reagent is removed;
c) sequentially adding copper sulfate, ethidium and xanthate in the lead-zinc mixed flotation roughing step and stirring to obtain lead-zinc mixed rough concentrate;
d) carrying out multiple concentration on the lead-zinc mixed rough concentrate to obtain high lead-zinc grade sulfur concentrate (Pb + Zn is more than 10 percent, and S is more than 30 percent); carrying out scavenging on the sulfur concentrate in the groove for multiple times to obtain high-quality sulfur concentrate (S is more than 42%);
e) performing multiple fine selection on the lead-zinc mixed rough concentrate, wherein middlings of each lead-zinc fine selection are returned to the last mineral separation step;
f) and in the multiple scavenging of the sulfur concentrate, the middlings in each scavenging are returned to the last beneficiation step.
2. The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation as claimed in claim 1, wherein in the lead and zinc mixed flotation roughing step, the copper sulfate is added in an amount of 100-500 g/t, and the stirring time is 3-5 minutes.
3. The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation is characterized in that in the lead and zinc mixed flotation roughing step, the total dosage of ethionine and butyl xanthate is 20-80 g/t, the proportion is 1: 1-3: 1, and the stirring time is 0.5-1.5 minutes.
4. The method for comprehensively recovering lead and zinc from the lead and zinc sorted sulfur concentrate according to claim 1, characterized in that the step of carrying out concentration on the lead and zinc mixed rough concentrate for a plurality of times comprises two times, namely primary lead and zinc concentration and secondary lead and zinc concentration, the middlings of each concentration are sequentially returned to the last concentration step, and no reagent is added in the primary lead and zinc concentration step; lime is added in the secondary lead-zinc concentration.
5. The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation is characterized in that no chemical is added in one lead and zinc concentrate, and the stirring time is 0.5-1.5 minutes; lime is added in secondary lead and zinc selection, and the stirring time is 1-3 minutes.
6. The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation according to claim 1, characterized in that the step of scavenging the sulfur concentrate for multiple times comprises two times, namely primary sulfur scavenging and secondary sulfur scavenging, the middlings in each scavenging are returned to the last beneficiation step, and the ethidium and the xanthate are added in both sulfur scavenging.
7. The method for comprehensively recovering lead and zinc from the sulfur concentrate after lead and zinc separation according to claim 6, characterized in that the total dosage of ethidium and xanthate added in the primary sulfur scavenging and the secondary sulfur scavenging is 10-30 g/t, and the stirring time is 0.5-1.5 minutes.
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| CN112619878A (en) * | 2020-11-10 | 2021-04-09 | 西北矿冶研究院 | Comprehensive recovery process for iron symbiotic nonferrous metal copper, lead and zinc |
| CN115400720A (en) * | 2022-08-26 | 2022-11-29 | 华南师范大学 | Adsorbent for removing sulfur-containing malodorous gas in non-ferrous metal mining area and preparation method and application thereof |
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Application publication date: 20200519 |