阅读说明：本技术 一种锂辉石分粒级双重介-浮选选矿方法 (Spodumene grading-grade dual medium-flotation beneficiation method ) 是由 李涤非 刘全军 于 2019-09-23 设计创作，主要内容包括：本发明公开一种锂辉石分粒级双重介-浮选选矿方法,属于矿物加工技术领域。本发明采用两段破碎流程,经筛分(或分级)处理,通过高密度重介选、低密度重介选,分别得到粗粒级锂辉石精矿产品和细粒级锂辉石精矿产品；旋流器溢流产品浓缩后磨矿,并经旋流器脱泥,沉砂进入浮选作业,得到微细粒级锂辉石精矿产品。本发明具有适应性强、生产成本低、可获得不同粒度下精矿产品、降低破碎磨矿能耗及药剂用量的优点。(The invention discloses a spodumene particle fraction dual medium-flotation beneficiation method, and belongs to the technical field of mineral processing. The invention adopts two-section crushing flow, and the rough-fraction spodumene concentrate product and the fine-fraction spodumene concentrate product are respectively obtained through screening (or grading) treatment and high-density heavy-medium separation and low-density heavy-medium separation; concentrating the overflow product of the cyclone, grinding, desliming by the cyclone, and performing floatation operation on settled sand to obtain a fine-particle-grade spodumene concentrate product. The invention has the advantages of strong adaptability, low production cost, capability of obtaining concentrate products under different granularities, and reduction of energy consumption for crushing and grinding ores and medicament dosage.)

1. A spodumene particle fraction dual medium-flotation beneficiation method is characterized by comprising the following steps:

(1) Coarsely crushing raw ore to 15mm, and screening to remove the-6 mm or-8 mm size fraction;

(2) The washed spodumene ore enters a high-density heavy medium cyclone for sorting to obtain a coarse-fraction light product and a heavy product, and the heavy product is subjected to medium removal, screening and medium removal to obtain a coarse-fraction spodumene concentrate I;

(3) naturally drying the light product obtained in the step (2) after medium removal by a medium removal sieve, combining the light product with the product sieved in the step (1), finely crushing the light product to 4mm, and removing-1 mm size fraction after classification by a cyclone;

(4) In the step (3), the cyclone sand setting enters a low-density heavy medium cyclone for sorting to obtain a fine-fraction light product and a heavy product, and the fine-fraction spodumene concentrate II is obtained after medium removal and screening;

(5) Concentrating overflow products of the cyclone in the step (3), combining the concentrated overflow products with the fine-fraction light products in the step (4), and grinding until the thickness of the overflow products is-0.074 mm and accounts for 70% of ~ 85%;

(6) Desliming the ore grinding product in the step (5) by adopting a hydrocyclone, and removing-0.019 mm or-0.01 mm superfine fraction;

(7) And (5) carrying out superfine-particle-grade spodumene flotation on the sand settled by the cyclone in the step (6), sequentially adding a regulator, an activator and a collector, and carrying out multiple fine concentration and scavenging to obtain superfine-particle-grade spodumene concentrate III.

2. The spodumene size fraction dual media-flotation beneficiation process according to claim 1, characterized in that the high density dense media in step (2) is ferrosilicon, and the density of the used dense media is 3.0 ~ 3.1.1 kg/L.

3. The spodumene size fraction dual media-flotation beneficiation process according to claim 1, characterized in that in step (4), the low density dense medium is ferrosilicon, and the density of the dense medium used is 2.8 ~ 2.9 kg/L.

4. The spodumene size fraction dual media-flotation beneficiation process according to claim 1, wherein in step (7), the conditioning agents are sodium carbonate and sodium hydroxide, and the amounts are 500 ~ 1500g/t and 400 ~ 1000g/t, respectively.

5. The spodumene size fraction dual media-flotation beneficiation process according to claim 1, characterized in that the activator in step (7) is calcium chloride in an amount of 50 ~ 300g/t to 300 g/t.

6. The spodumene size fraction dual media-flotation beneficiation method according to claim 1, characterized in that in the step (7), the collecting agent is one or two of oleic acid, sodium oleate and oxidized soap wax, and the using amount is 50 ~ 200 g/t.

Technical Field

The invention relates to a spodumene classification grade dual medium-flotation beneficiation method, and belongs to the technical field of mineral processing.

Background

Spodumene mineral resources in China are rich, but the utilization rate of spodumene mineral resources is low. Spodumene ore has complex structure and composition, uneven mineral laying granularity, various gangue minerals and serious argillization. The raw ore often contains more easily selected coarse fraction, but is interfered by slime after ore grinding, so that the ore pulp composition is complex, the medicament selectivity is reduced, the spodumene flotation recovery is extremely difficult, and the concentrate product with higher grade and recovery rate is difficult to obtain.

the spodumene beneficiation method commonly used in industry comprises a flotation method and a heavy medium beneficiation method, and is matched with other beneficiation means to separate other valuable components in the ore. The flotation method is the most important method for sorting spodumene, particularly spodumene existing in a fine-grain dip-dyed state, but the spodumene ore has complex properties, and the flotation method is easily influenced by factors such as ore properties, ore grinding fineness, stirring operation, regulator proportion, water quality hardness and the like. The dense medium separation spodumene is a separation method which is concerned in recent years, and has the characteristics of low investment, low cost, high grade of obtained concentrate, easiness in subsequent extraction and processing of lithium salt and the like.

CN102909136A discloses a spodumene ore dressing method, which comprises the steps of slime flotation, spodumene fast roughing, spodumene fast fine dressing, spodumene slow roughing, spodumene slow fine dressing and the like, and obtains better ore concentrate indexes. However, the method adopts reverse flotation (slime roughing) to pre-sort the slime, the reverse flotation is generally used in the fine sorting stage of concentrate products, the reverse flotation is difficult to implement due to the large amount of raw ores, the reagent consumption and the ore dressing cost are very high, and the method performs regrinding treatment on the slow roughed concentrate, so that the ore dressing cost and the ore grinding energy consumption are further increased.

CN103977905A discloses a method for separating Lihuite ore, which comprises the steps of ore grinding, two times of rough concentration, one time of scavenging, two times of fine concentration and the like, has the characteristics of simple process flow, good medicament selectivity, strong collecting capability, low medicament dosage and the like, and can obtain the lithium concentrate with the concentrate grade of more than 6% and the recovery rate of more than 85%. The method adopts the preferential flotation of the easily-floated minerals and then carries out the conventional separation, but part of the easily-floated minerals in the raw ore are not separated in time, but are pre-floated after the ore grinding, and the easily-floated minerals are ground and are easily influenced by soluble salts and slime in the ore pulp, so that the bottleneck of single flotation is not broken through.

CN101147888 discloses a spodumene ore heavy medium-strong magnetic separation process, which comprises the steps of crushing raw ore, washing the ore, washing off-0.5 mm part of ore mud, then performing heavy medium separation on the washed spodumene, removing medium by a medium removing sieve to obtain tailings of light minerals, and obtaining a spodumene concentrate product of heavy products. The process method has the advantages of simplicity, reasonability, low cost and the like, but the strong magnetic separation in the method only separates other weakly magnetic minerals, has no effect on spodumene, and is difficult to recover the spodumene minerals embedded with fine particles, so the method only has certain effect on the spodumene which has higher grade, simple embedding characteristics and is easier to select, and has low applicability.

Disclosure of Invention

The invention aims to provide a spodumene grading-grade dual medium-flotation beneficiation method aiming at the problems that concentrate grade is low, grading cost is high, coarse-grain-grade minerals cannot be pre-sorted, single beneficiation adaptability is poor and the like in the existing spodumene beneficiation, the method adopts a grading-grade dual medium after raw ores are crushed to pre-sort coarse-grain and fine-grain spodumene, and coarse-grain and fine-grain spodumene concentrate products are respectively obtained; and (3) carrying out desliming on the heavy medium ore dressing light tailings after ore grinding, and carrying out flotation on the fine spodumene through sand settling to obtain a fine spodumene concentrate product.

The invention relates to a spodumene particle fraction dual medium-flotation beneficiation method, which specifically comprises the following steps:

(1) the raw ore is coarsely crushed to 15mm and the-6 mm or-8 mm size fraction is removed by screening.

(2) And (3) the washed spodumene ore enters a high-density heavy medium cyclone for sorting to obtain a coarse-fraction light product and a heavy product, and the heavy product is subjected to medium removal, screening and medium removal to obtain a coarse-fraction spodumene concentrate I.

(3) and (3) naturally drying the light product obtained in the step (2) after medium removal by a medium removal sieve, combining the light product with the product sieved in the step (1), finely crushing the light product to 4mm, and removing-1 mm size fraction after classification by a cyclone.

(4) And (4) putting the cyclone settled sand into a low-density heavy medium cyclone for sorting to obtain a fine-fraction light product and a heavy product, and performing medium removal screening and medium removal to obtain a fine-fraction spodumene concentrate II.

(5) And (4) concentrating the overflow product of the cyclone in the step (3), combining the concentrated overflow product with the fine-fraction light product in the step (4), and grinding until the thickness of the product is-0.074 mm, wherein the product accounts for 70% ~ 85%.

(6) And (5) desliming the ore grinding product in the step (5) by adopting a hydrocyclone, and removing-0.019 mm or-0.01 mm superfine fraction.

(7) And (5) carrying out superfine-particle-grade spodumene flotation on the sand settled by the cyclone in the step (6), sequentially adding a regulator, an activator and a collector, and carrying out multiple fine concentration and scavenging to obtain superfine-particle-grade spodumene concentrate III.

Preferably, the high-density dense medium in step (2) of the present invention is ferrosilicon, and the density of the used dense medium is 3.0 ~ 3.1.1 kg/L.

Preferably, the low-density dense medium in step (4) of the present invention is ferrosilicon, and the density of the dense medium used is 2.8 ~ 2.9.9 kg/L.

Preferably, the modifying agents in step (7) of the present invention are sodium carbonate and sodium hydroxide, and the amounts are 500 ~ 1500g/t and 400 ~ 1000g/t, respectively.

Preferably, the activator in step (7) of the present invention is calcium chloride in an amount of 50 ~ 300 g/t.

Preferably, the collector in the step (7) of the invention is one or two of oleic acid, sodium oleate and soap wax oxide (731), and the dosage is 50 ~ 200 g/t.

the invention has the beneficial effects that:

(1) The rough crushing and fine crushing of the raw ore are carried out by adopting dual medium of grading grade, then spodumene is sorted, products with coarse embedded granularity can be enriched in advance, and rough-grade spodumene concentrate I and fine-grade spodumene concentrate II are obtained by medium removal screening, so that spodumene can be enriched under different granularities, and better sorting indexes can be obtained.

(2) the coarse crushing, pre-screening and fine crushing and grading are adopted, so that the problem that fine-grained minerals are difficult to separate in heavy media with different densities is effectively solved, the defect that the fine-grained minerals are difficult to remove in a heavy medium suspension is overcome, and the influence of the fine-grained minerals on the medium density of the heavy medium suspension is avoided.

(3) After coarse crushing and fine crushing, the coarse fraction minerals are subjected to heavy medium separation respectively, the ore feeding amount of crushing and subsequent ore grinding is reduced, the crushing and grinding energy consumption is greatly reduced, the light minerals are brittle and easy to crush, and the abrasion of parts such as a crusher lining plate is further reduced.

(4) The spodumene is treated by classification grade double-section heavy medium separation, so that minerals with coarse embedded granularity can be separated as soon as possible, and further, the influence of soluble salt and slime on the part of minerals after being levigated is avoided, and the minerals are difficult to be effectively separated.

(5) the coarse-fraction spodumene concentrate I and the fine-fraction spodumene concentrate II are selected in advance, so that pollution caused by separation by using a chemical reagent is avoided, and better conditions are created for subsequent extraction and processing of lithium salts.

(6) Under the condition of ensuring the recovery rate, the product after ore grinding is deslimed in advance, and because the grade of the raw ore is reduced after heavy medium separation, the desliming has less loss to valuable elements at the moment, but a large amount of fine-grained gangue minerals can be removed, and the influence of the part of minerals on the subsequent flotation is further avoided.

(7) The product after grinding is subjected to conventional flotation to ensure the recovery of the very fine particle-grade spodumene in the raw ore and has strong adaptability to the very fine particle-grade spodumene.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention.

Detailed Description

the present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited to the description.