CN105772215A - Mineral processing method of separating sulfur concentrates from selected pyrite tailings - Google Patents

Abstract

The invention relates to an ore dressing method for sorting sulfur concentrate from sorting pyrite tailings. Sulfur tailings with a sulfur grade of 4%~16% are used as raw materials to make pulp with a concentration of 35%~55%. The steps include: step 1: re-election; step 2: closed-circuit grinding; step 3: closed-circuit flotation election; the re-election equipment includes: spiral chute one, spiral chute two; the closed-circuit grinding equipment includes: vertical spiral stirring mill, classifier. The method of the present invention utilizes the specific gravity difference between pyrite and gangue minerals, and selects a spiral chute with a small footprint and high processing energy as the gravity separation equipment to pre-enrich the sulfur separation tailings, which greatly reduces the need for grinding and flotation operations The amount of ore; the vertical spiral stirring mill is used as the grinding equipment to improve the dissociation degree of pyrite, and at the same time rely on the strong shear stress between the media in the stirring mill to strengthen the scrubbing effect, clean the surface of the particles, and provide flotation reagents in the sulfur The operation on the surface of the iron ore provides good conditions; the flotation method with high separation accuracy is used to process the grinding products, and the final high-grade sulfur concentrate product is obtained after multiple flotation and separation.

Description

A kind of beneficiation method for sorting sulfur concentrate from sorting pyrite tailings

technical field

The invention belongs to the technical field of mineral processing industry, and in particular relates to a mineral processing method for separating sulfur concentrate from pyrite tailings.

Background technique

With the development of society and economy, a large number of raw ore resources of mines are decreasing and exhausted day by day. As an important secondary mineral resource, mine tailings have been increasingly valued and comprehensively developed and utilized.

Pyrite has good natural buoyancy and is usually sorted by flotation. Under the action of mercapto sulfide collectors, it can effectively float up and achieve efficient separation of pyrite and gangue minerals. Therefore, flotation The selection method is one of the most perfect sulfur selection methods at present, and the flotation method can often get a higher sulfur selection index. In addition, the proportion of pyrite is generally 4.9~5.2, while the proportion of gangue minerals associated with it is mostly below 3.0, so gravity separation is also one of the commonly used separation methods for pyrite.

During the process of producing sulfur concentrate by flotation, the pyrite monomers that are polluted on the surface, the pyrite particles that exist in the form of packages and conglomerates will enter into the sulfur tailings due to their poor floatability, but this part There is still a large difference in specific gravity between particles and gangue minerals, and it is still possible to be sorted and recovered.

In addition, the sulfur reserves of associated pyrite in my country are about 330 million tons, most of which are associated with non-ferrous metal sulfide ores. Compared with non-ferrous metal sulfide ore, the economic value of this part of pyrite resources is low, and production enterprises often do not pay attention to the production process of sulfur concentrate, resulting in low production indicators of sulfur concentrate, and a large amount of pyrite resources are lost in sulfur tailings. And sent to the tailings stockpile. Due to long-term weathering, the surface of these pyrite-containing particles in the tailings pond is severely oxidized, and the floatability becomes poor, but it is still possible to be recovered by gravity separation.

Patent No. 200810058133.9, a method for producing high-grade sulfur concentrate from sulfur-containing low-grade pyrite ore, proposes to use a spiral chute-shaker to directly produce some high-grade sulfur concentrate from ore with a sulfur content of 8% to 25%. High-grade sulfur concentrate, another part of high-grade sulfur concentrate is produced by flotation in the shaking table. In this invention, although the grade of the raw material is low, it still belongs to primary ore, and the pyrite therein has better natural floatability.

Zeng Maohua et al. proposed a method for sorting sulfur concentrate from tailings in tailings pond. After classification by fine sieve, shaker was used for pre-enrichment and tailings, and the shaker concentrate was reground and floated to produce a sulfur grade of 35.7. % of sulfur concentrate. Although the shaker is a re-selection device with high separation accuracy, its processing capacity is too small, and it will inevitably occupy a lot of space if it is used as a tail-throwing device in industrial implementation.

Based on the above background and technical status, as a secondary resource rich in sulfur, sulfur tailings have not been effectively utilized. Therefore, it is necessary to develop a beneficiation method with simple process, low cost and wide adaptability of raw materials to recover the sulfur resources lost in the sulfur beneficiation tailings.

Contents of the invention

The purpose of the present invention is to provide a mineral processing method with simple process, strong raw material adaptability, low cost and maximum recovery rate of sulfur resources for the pyrite lost in sulfur processing tailings.

In order to achieve the above object, the technical scheme adopted in the present invention is: a kind of beneficiation method for sorting sulfur concentrate from sorting pyrite tailings, using sulfur grade tailings with a sulfur grade of 4%~16% as raw material , to make a concentration of 35% ~ 55% pulp, the steps include:

Step 1: Reselect;

Step 2: closed-circuit grinding;

Step 3: closed circuit flotation;

The re-selection equipment includes: spiral chute one, spiral chute two;

The closed-circuit grinding equipment includes: a vertical spiral stirring mill and a classifier;

The closed-circuit flotation equipment includes: roughing equipment, refining equipment, and sweeping equipment;

The first spiral chute and the second spiral chute are connected to a classifier, and the classifier is connected to a vertical spiral stirring mill to form a closed-circuit grinding; the classifier is connected to a roughing equipment; the roughing is connected to a selection equipment, and the selection equipment Connect the sweeping equipment, and the sweeping equipment is connected to the roughing equipment to form a closed-circuit flotation.

Further, the reselection step includes:

Sulfur beneficiation tailings are made into slurry with a concentration of 35%~55%, and then fed into spiral chute 1, and separated to obtain spiral chute 1 concentrate and spiral chute 1 tailings; spiral chute 1 tailings are then fed into spiral chute 2, separated The second spiral chute concentrate and the second spiral chute tailings are selected.

Further, the closed-circuit grinding step includes:

The spiral chute 1 concentrate and the spiral chute 2 concentrate are combined, adjusted and sent to the classifier, and the particle size of the grinding product is controlled to be less than 0.040mm, accounting for 70%~90%.

Further, the closed circuit flotation step includes:

The closed-circuit grinding products are sent to the flotation operation, and the final concentrate with a sulfur grade greater than 40% is obtained after the closed-circuit flotation in which the middle ore returns sequentially after a roughing, 2-3 times of beneficiation, and 1-2 times of sweeping. The flotation scavenging tailings and spiral chute 2 tailings are merged into final tailings.

Further, the first spiral chute is a spiral chute with flushing water on the inner edge, and the aspect ratio is 0.60-0.80.

Further, the second spiral chute is a spiral chute with flushing water on the inner edge, and the aspect ratio is 0.36-0.45.

Further, the sulfur grade of the concentrate in the spiral chute 1 is controlled to be 18-30% by changing the adjustable plectrum at the end of the spiral chute 1 to adjust the concentrate production rate of the spiral chute 1 .

Further, the sulfur grade of the concentrate in the second spiral chute is controlled to be 14% to 22% by changing the adjustable paddle at the end of the second spiral chute to adjust the concentrate production rate of the second spiral chute.

Further, the first spiral chute concentrate and the second spiral chute concentrate are combined and adjusted to a mass concentration of 25% to 35%.

Further, 200-300 g/ton dry ore sodium butyl yellow hydrochloride is added to the vertical spiral agitated mill in the closed-circuit grinding step.

The beneficial effects of the present invention are as follows.

1. Utilizing the difference in specific gravity between pyrite and gangue minerals, a spiral chute with a small footprint and high processing energy is selected as the gravity separation equipment to pre-enrich the sulfur tailings and discard a large amount of tailings, which greatly reduces the amount of waste entering the grinding mill. The amount of ore in mines and flotation operations. The spiral chute has both gravity separation and certain classification functions. In the present invention, two kinds of spiral chutes with different distance-to-diameter ratios are used to separate and recover coarse and fine-grained heavy mineral particles. The gangue minerals mixed into the inner side are removed, and the heavy minerals on the inner edge are enriched twice to increase the enrichment ratio of the spiral chute.

2. The vast majority of gravity concentrates are conjoined bodies, inclusions, or pyrite particles with contaminated surfaces. To obtain qualified grade sulfur concentrates, it is still necessary to increase the degree of dissociation of pyrites. The present invention adopts vertical spiral stirring mill as ore grinding equipment, while improving the dissociation degree of pyrite, relying on the strong shear stress between the media in the stirring mill to strengthen the scrubbing effect, cleaning the surface of particles, and providing flotation agents in pyrite The operation on the surface provides good conditions; in addition, the collector is added directly into the mill, and the agitation of the stirring mill is used to strengthen the interaction between the agent and the surface of the ore particles.

3. The flotation method with high separation accuracy is used to process the grinding products, and the flotation rough concentrate is subjected to multiple flotation and selection to obtain high-grade final sulfur concentrate products.

Description of drawings

Fig. 1 is a block diagram of the process flow of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and examples, which are not intended to limit the embodiments of the present invention.

As shown in Figure 1, the sulfur tailings with a sulfur grade of 4% to 16% are used as raw materials to make a slurry with a concentration of 35% to 55%. The concentrate enters the closed circuit through the first separation of the spiral chute and the second separation of the spiral chute. Grinding and tailings throwing; the closed-circuit grinding products are sent to the flotation operation, and the final concentrate with a sulfur grade greater than 40% is obtained after the closed-circuit flotation of roughing, beneficiation, sweeping, and medium ore return in sequence, and the flotation Sweeping and dressing tailings are merged with spiral chute 2 tailings into final tailings.

A beneficiation method for sorting sulfur concentrate from pyrite tailings, using sulfur tailings with a sulfur grade of 4% to 16% as a raw material to make a slurry with a concentration of 35% to 55%, including Follow the steps below.

Step 1 is secondary gravity separation: feed the pulp with a concentration of 35%~55% into the spiral chute 1, and separate to obtain the spiral chute 1 concentrate and spiral chute 1 tailings; the spiral chute 1 tailings are then fed into the spiral chute 2. Sorting to obtain the second spiral chute concentrate and the second spiral chute tailings; the first spiral chute is a spiral chute with flushing water on the inner edge, and the ratio of distance to diameter is 0.60-0.80; by changing the end of the spiral chute, the paddle can be adjusted to adjust the spiral The concentrate production rate of the first spiral chute is used to control the sulfur grade of the first concentrate of the spiral chute to be 18-30%; Adjust the concentrate production rate of spiral chute 2 by adjusting the paddle to control the sulfur grade of spiral chute 2 concentrate to 14%~22%.

Step 2 is closed-circuit grinding: combine the first spiral chute concentrate and the second spiral chute concentrate, adjust the slurry to a mass concentration of 25%~35%, and send it to the classifier. Add 200~300 g/ton dry ore sodium butyl yellow hydrochloride to the vertical spiral stirring mill, and control the grinding product particle size to be less than 0.040mm through classifier and vertical spiral stirring mill closed-circuit grinding, accounting for 70% ~90%.

Step 3 is closed-circuit flotation: the grinding products that meet the requirements enter the closed-circuit flotation through the overflow port on the upper part of the classifier, pass a rough selection, and then go through 2~3 times of beneficiation, 1~2 times of sweeping, and the middle ore sequence After returning to the closed-circuit flotation process, the final concentrate with a sulfur grade greater than 40% is obtained, and the flotation scavenging tailings and the second spiral chute tailings are combined to form the final tailings.

Example 1:

A mineral processing method for sorting sulfur concentrate from sulfur tailings, using sulfur tailings with a sulfur grade of 4% to 10% as a raw material, the steps are:

Step 1 is re-election: put the sulfur-selected tailings into spiral chute 1 after pulping, and separate to obtain spiral chute 1 concentrate and spiral chute 1 tailings; spiral chute 1 tailings are fed into spiral chute 2, and sorted Spiral chute 2 concentrate and spiral chute 2 tailings;

In step 1, the mass concentration of the pulp after sulfur dressing tailings pulping is 35%~45%; the spiral chute is a spiral chute with flushing water on the inner edge, and the ratio of distance to diameter is 0.60; by changing the tail end of the spiral chute, it can be adjusted Adjust the concentrate production rate of spiral chute 1 to control the sulfur grade of spiral chute 1 to 18~24% with the paddle; spiral chute 2 is a spiral chute with flushing water on the inner edge, and the ratio of distance to diameter is 0.36; by changing the tail of the spiral chute The plectrum can be adjusted at the end to adjust the concentrate production rate of the second spiral chute to control the sulfur grade of the second spiral chute concentrate to 14%~17%.

Step 2 is closed-circuit grinding: the spiral chute 1 concentrate and spiral chute 2 concentrate are combined, after slurry adjustment, they are sent to closed-circuit grinding, and the particle size of the grinding product is controlled to be less than 0.040mm, accounting for 85%~90%;

In step 2, the first concentrate of the spiral chute and the second concentrate of the spiral chute are combined and adjusted to a mass concentration of 25%~30%; the grinding machine used for closed-circuit grinding is a vertical spiral stirring mill, and the Add 200~300 g/ton of dry ore butyl yellow sodium hydrochloride.

Step 3 is closed-circuit flotation: the grinding product is sent to flotation operation, and after roughing, selection, sweeping, and medium ore are returned in sequence, the final concentrate with a sulfur grade greater than 40% is obtained, and flotation The scavenging tailings and the second tailings of the spiral chute are merged into the final tailings.

Main Specifications:

The ore sulfur grade is 4%~10%.

The sulfur grade of the sulfur concentrate is greater than 40%, and the recovery rate of sulfur in the sulfur concentrate is 50% to 60%.

Example 2:

A mineral processing method for sorting sulfur concentrate from sulfur tailings, using sulfur tailings with a sulfur grade of 11% to 16% as a raw material, the steps are:

Step 1 is re-election: put the sulfur-selected tailings into spiral chute 1 after pulping, and separate to obtain spiral chute 1 concentrate and spiral chute 1 tailings; spiral chute 1 tailings are fed into spiral chute 2, and sorted Spiral chute 2 concentrate and spiral chute 2 tailings;

In step 1, the mass concentration of the pulp after pulping the sulfur dressing tailings is 45%~55%; the spiral chute is a spiral chute with flushing water on the inner edge, and the ratio of distance to diameter is 0.75; the tail end of the spiral chute can be adjusted Adjust the concentrate production rate of spiral chute 1 to control the sulfur grade of spiral chute 1 concentrate to 25~30%; The plectrum can be adjusted at the end to adjust the concentrate production rate of the second spiral chute to control the sulfur grade of the second spiral chute concentrate to 18%~22%.

Step 2 is closed-circuit grinding: the spiral chute 1 concentrate and the spiral chute 2 concentrate are combined, after slurry adjustment, they are sent to closed-circuit grinding, and the particle size of the grinding product is controlled to be less than 0.040mm, accounting for 75%~80%;

In step 2, the first concentrate of the spiral chute and the second concentrate of the spiral chute are combined and adjusted to a mass concentration of 30%~35%; the grinding machine used for closed-circuit grinding is a vertical spiral stirring mill, and the Add 200~300 g/ton of dry ore butyl yellow sodium hydrochloride.

Step 3 is closed-circuit flotation: the grinding product is sent to flotation operation, and after roughing, selection, sweeping, and medium ore are returned in sequence, the final concentrate with a sulfur grade greater than 40% is obtained, and flotation The scavenging tailings and the second tailings of the spiral chute are merged into the final tailings.

Main Specifications:

The ore sulfur grade is 11%~16%.

The sulfur grade of the sulfur concentrate is greater than 40%, and the recovery rate of sulfur in the sulfur concentrate is 60%~75%.

Claims (10)

1. from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, adopt sulfur grade be 4% ~ 16% select sulfur mine tailing as raw material, the ore pulp that concentration is 35% ~ 55% by selecting sulfur mine tailing to make, its characterization step includes:

Step 1: gravity treatment；

Step 2: closed circuit grinding；

Step 3: closed circuit flotation；

Described gravitational separation equipment includes: spiral chute one, spiral chute two；

Described closed circuit grinding equipment includes: vertical screw-stirring mill, grader；

Described closed circuit floatation equipment includes: roughing separation equipment, picking equipment, scan equipment；

Described spiral chute one, spiral chute two connect grader, and described grader connects vertical screw-stirring mill and forms closed circuit grinding；Described grader connects roughing separation equipment；Described roughly selecting is connected with picking equipment, and picking equipment connects scans equipment, and equipment of scanning connects roughing separation equipment, forms closed circuit flotation.

2. according to claim 1 a kind of from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, it is characterised in that described gravity treatment step includes:

Feeding spiral chute one after select sulfur mine tailing to make ore pulp that concentration is 35% ~ 55%, sorting obtains spiral chute one concentrate and spiral chute one mine tailing；Spiral chute one mine tailing feeds spiral chute two again, and sorting obtains spiral chute two concentrate and spiral chute two mine tailing.

3. according to claim 1 a kind of from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, it is characterised in that described closed circuit grinding step includes:

Spiral chute one concentrate is merged with spiral chute two concentrate, sends into grader after sizing mixing, and control ore milling product granularity and account for 70% ~ 90% less than 0.040mm.

4. according to claim 1 a kind of from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, it is characterised in that described closed circuit flotation step includes:

Closed circuit grinding product is delivered to flotation operation, through one roughing, 2 ~ 3 times selected, scan for 1 ~ 2 time, obtain the sulfur grade final concentrate more than 40% after the closed circuit flotation that chats order returns, flotation is scanned mine tailing and spiral chute two mine tailing and is merged into true tailings.

5. according to claim 1 a kind of from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, it is characterised in that spiral chute one is the spiral chute of marginal zone flushing water, and pitch to diameter ratio is 0.60-0.80.

6. according to claim 1 a kind of from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, it is characterised in that spiral chute two is the spiral chute of marginal zone flushing water, and pitch to diameter ratio is 0.36-0.45.

7. according to claim 5 a kind of from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, it is characterised in that plectrum can be transferred to adjust the concentrate yield of spiral chute one by changing spiral chute one tail end to control the sulfur grade of spiral chute one concentrate be 18 ~ 30%.

8. according to claim 6 a kind of from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, it is characterised in that plectrum can be transferred to adjust the concentrate yield of spiral chute two by changing spiral chute two tail end to control the sulfur grade of spiral chute two concentrate be 14% ~ 22%.

9. according to claim 3 a kind of from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, it is characterised in that spiral chute one concentrate is sized mixing to mass concentration 25% ~ 35% after merging with spiral chute two concentrate.

10. according to claim 1 a kind of from sorting the beneficiation method sorting iron concentrate pyrite mine tailing, it is characterised in that in the vertical screw agitating mill in described closed circuit grinding step, to add the butyl Huang hydrochloric acid sodium in the dry ore deposit of 200 ~ 300 g ton.