阅读说明：本技术 用组合抑制剂浮选分离锡石硫化矿泥矿中氧化铁矿的方法 (Method for flotation separation of iron oxide ore in cassiterite sulphide ore mud ore by using combined inhibitor ) 是由 王烨 仇云华 张慧 张翔 温晓娜 于 2020-03-27 设计创作，主要内容包括：用组合抑制剂浮选分离锡石硫化矿泥矿中氧化铁矿的方法,所述组合抑制剂由碳酸钠和三聚磷酸钠组成,所述浮选分离锡石硫化矿泥矿中氧化铁矿的作业包括对锡石硫化矿依序进行粗选、扫选和精选,在粗选过程中,先用碳酸钠溶液调节矿浆pH＝6～8,然后加入三聚磷酸钠溶液、捕收剂水杨羟肟酸、辅助捕收剂P86,经过粗选、扫选和精选,将锡石与氧化铁矿物分离。本发明的组合抑制剂具有选择性强、常温可溶、无毒无害、用量低、精矿易处理等优点,可实现锡石与氧化铁矿物的有效分离,进一步提高锡精矿质量。(The method for separating the iron oxide ore from the cassiterite sulfide ore mud ore by using the combined inhibitor in a flotation mode comprises the steps of carrying out roughing, scavenging and concentrating on the cassiterite sulfide ore in sequence, adjusting the pH value of ore pulp to be 6-8 by using a sodium carbonate solution in the roughing process, then adding a sodium tripolyphosphate solution, a collecting agent salicylhydroxamic acid and an auxiliary collecting agent P86, and separating the cassiterite from the iron oxide ore by the roughing, scavenging and concentrating. The combined inhibitor has the advantages of strong selectivity, normal-temperature solubility, no toxicity, no harm, low consumption, easy treatment of concentrate and the like, can realize effective separation of cassiterite and iron oxide minerals, and further improves the quality of tin concentrate.)

1. The method for separating the iron oxide ore from the cassiterite sulfide ore mud ore by using the combined inhibitor in a flotation mode is characterized in that the combined inhibitor consists of sodium carbonate and sodium tripolyphosphate, and the operation of separating the iron oxide ore from the cassiterite sulfide ore mud ore in the flotation mode comprises the steps of carrying out rough concentration, scavenging and fine concentration on the cassiterite sulfide ore in sequence; the flotation separation method comprises the following steps:

(1) adding sodium carbonate into water at normal temperature, and fully stirring to prepare a sodium carbonate solution with the mass concentration of 5% for later use; adding sodium tripolyphosphate into water at normal temperature, fully stirring, and preparing a sodium tripolyphosphate solution with the mass concentration of 0.5% for later use; adding salicylhydroxamic acid and sodium carbonate accounting for 20% of the mass of the salicylhydroxamic acid into hot water at the temperature of 80-100 ℃, fully stirring to prepare a salicylhydroxamic acid solution with the mass concentration of 5%, and keeping the temperature for later use; p86 was used as a co-collector;

(2) in the rough concentration process, firstly, adjusting the pH value of cassiterite sulfide ore pulp to be 6-8 by using the sodium carbonate solution prepared in the step (1), wherein the ore feeding amount of the sodium carbonate solution is 100-600 g/t, then adding the sodium tripolyphosphate solution according to the ore feeding amount of 20-100 g/t, adding the salicylhydroxamic acid solution according to the ore feeding amount of 300-600 g/t, and adding P86 according to the ore feeding amount of 100-200 g/t; the mass concentration of cassiterite sulfide ore pulp in the roughing operation is 25-45%;

(3) in the scavenging process, adding salicylhydroxamic acid solution according to the ore feeding amount of 100-200 g/t, and adding P86 according to the ore feeding amount of 30-70 g/t; the mass concentration of the ore pulp in the scavenging operation is 20-30 percent;

(4) and (4) further concentrating the scavenged ore pulp, and separating cassiterite from iron oxide minerals.

2. The method for flotation separation of iron oxide ore from cassiterite sulphide ore sludge using combined depressants according to claim 1, wherein the cassiterite sulphide ore sludge is a sludge material with a-10 μm fraction content of < 15% and a sulphur grade of < 0.5% after desliming and desulphurisation of the ore in the cassiterite sulphide ore gravity separation operation.

3. The process for the flotation separation of iron oxide ores from cassiterite sulphide ore sludge with combined depressants according to claim 1 or 2, characterised in that the scavenging operation is carried out twice.

4. The method for flotation separation of iron oxide ore from cassiterite sulphide ore sludge using combined depressants according to claim 1 or 2, characterized in that the concentration operation is performed 2-3 times, and the mass concentration of the ore pulp of three concentration operations is 17-21%, 9-16% and 5-10% respectively.

5. The method for flotation separation of iron oxide ore from cassiterite sulphide ore sludge according to claim 3, characterized in that the concentration operation is performed 2-3 times, and the mass concentration of the ore pulp of three concentration operations is 17-21%, 9-16% and 5-10% respectively.

Technical Field

The invention relates to a mineral flotation combined inhibitor, in particular to an inhibitor for iron oxide minerals in the flotation of high-iron cassiterite sulfide slime ores, and belongs to the technical field of mineral flotation agents.

Background

Cassiterite contains 78.6% tin, the most common tin mineral, and is also the most predominant mineral of tin. Because the specific gravity difference between the cassiterite and the gangue is large, gravity separation is the main method for sorting the cassiterite and is widely applied. The cassiterite has the mechanical properties of high hardness, high density, brittleness and the like, is easily crushed in the ore grinding process, and has larger limitation on recovering the fine-grained cassiterite by a gravity separation method, so that a great amount of tin metal is lost. According to statistics, 80% of the tin metal lost in China is lost from the slime, about one third of the tin ore is lost in a fine-grained form all over the world, and the grade of the tin ore is lower and lower along with the continuous exploitation of the original tin ore resource, so that the strengthening of the recovery of the fine-grained cassiterite has important significance for improving the recovery and utilization of the tin ore resource. Compared with gravity separation, the lower limit of effective recovery granularity of flotation is much lower, in recent years, the cassiterite flotation technology in China has made a certain progress, and cassiterite flotation technology has been applied industrially and has obtained better separation indexes by Yunnan UnionZn-in, inner Mongolia yellow-hillock mining, Yunnan Sn industry shares and partial private factories.

In the cassiterite flotation, fine mud, sulfide and iron minerals are main factors influencing the cassiterite flotation, and the 'three-removal' is realized as much as possible before the cassiterite flotation is carried out. In recent years, the influence of fine mud and sulfide on flotation indexes is better eliminated by adopting a cyclone desliming and flotation desulfurizing process in a cassiterite flotation process. However, with the gradual decrease of the grade of the tin ore, the granularity of the cassiterite is increasingly finer, the content of iron minerals is continuously increased, the combination of tin and iron is more and more compact, and the like, the influence of iron oxide minerals represented by hematite/limonite on the flotation index of the fine-grade cassiterite is gradually highlighted, and an effective removal/inhibition method for the iron oxide minerals is lacked at present: firstly, iron and tin are seriously included in the magnetic separation. Technical personnel perform a magnetic separation iron removal test on settled sand obtained after mud and sulfur removal of the cassiterite sulfide ore gravity separation mud ore of a certain separation plant, and the result shows that the yield, the grade and the recovery rate of iron ore concentrate are improved along with the increase of the magnetic field intensity, but the product has high tin content (the tin content grade is close to that of the fed ore), the loss of tin is large (the loss rate is about 50 percent), and the iron removal effect is not ideal; secondly, the collector selectivity is poor. Hydroximic acid collecting agents commonly used in the conventional cassiterite flotation can generate stronger complex reaction with iron oxide minerals to generate chelate, and the part of the iron oxide minerals float upwards to enter concentrate products, so that the concentrate quality and the operation efficiency are influenced; finally, the selectivity and utility of commonly used inhibitors is poor. When the consumption of the inhibitors such as soluble glass, carboxymethyl cellulose (CMC), soluble starch, tannin extract, sodium humate, sodium fluosilicate and the like is small, the inhibitors have strong inhibition effect on cassiterite, and the concentrate is difficult to treat after part of the inhibitors are used. There is therefore currently no more effective means of addressing the adverse effects of iron minerals on cassiterite flotation.

Disclosure of Invention

The invention aims to provide a combined inhibitor which has strong selectivity, no toxicity, no harm, small using amount and easy concentrate treatment and is used for floating iron oxide minerals from cassiterite sulfide ore mud aiming at the problem of poor removal/inhibition effect of the iron oxide minerals in the existing cassiterite flotation. It is another object of the present invention to provide a method for flotation of iron oxide minerals from cassiterite sulphide ore sludge using said combined depressant.

The technical scheme adopted by the invention is as follows:

the method for flotation separation of iron oxide ore in the cassiterite sulphide ore mud ore by using the combined inhibitor, wherein the combined inhibitor consists of sodium carbonate and sodium tripolyphosphate, and the operation of flotation separation of the iron oxide ore in the cassiterite sulphide ore mud ore comprises the steps of roughing, scavenging and concentrating the cassiterite sulphide ore in sequence; the flotation separation method comprises the following steps:

(1) adding sodium carbonate into water at normal temperature, and fully stirring to prepare a sodium carbonate solution with the mass concentration of 5% for later use; adding sodium tripolyphosphate into water at normal temperature, fully stirring, and preparing a sodium tripolyphosphate solution with the mass concentration of 0.5% for later use; adding salicylhydroxamic acid and sodium carbonate accounting for 20% of the mass of the salicylhydroxamic acid into hot water at the temperature of 80-100 ℃, fully stirring to prepare a salicylhydroxamic acid solution with the mass concentration of 5%, and keeping the temperature for later use; p86 was used as a co-collector;

(2) in the rough concentration process, firstly, adjusting the pH value of cassiterite sulfide ore pulp to be 6-8 by using the sodium carbonate solution prepared in the step (1), wherein the ore feeding amount of the sodium carbonate solution is 100-600 g/t, then adding the sodium tripolyphosphate solution according to the ore feeding amount of 20-100 g/t, adding the salicylhydroxamic acid solution according to the ore feeding amount of 300-600 g/t, and adding P86 according to the ore feeding amount of 100-200 g/t; the mass concentration of cassiterite sulfide ore pulp in the roughing operation is 25-45%;

(3) in the scavenging process, adding salicylhydroxamic acid solution according to the ore feeding amount of 100-200 g/t, and adding P86 according to the ore feeding amount of 30-70 g/t; the mass concentration of the ore pulp in the scavenging operation is 20-30 percent;

(4) and (4) further concentrating the scavenged ore pulp, and separating cassiterite from iron oxide minerals.

Furthermore, the cassiterite sulfide ore mud ore is a mud ore material with the grain size content of-10 mu m less than 15% and the sulfur grade less than 0.5% after desliming and desulfurizing the mud ore in the cassiterite sulfide ore gravity separation operation.

Further, the scavenging operation is performed twice.

Furthermore, the concentration operation is carried out for 2 to 3 times, and the mass concentration of the ore pulp of the three concentration operations is respectively 17 to 21 percent, 9 to 16 percent and 5 to 10 percent.

The combined inhibitor adopted by the invention has the characteristics of strong selectivity, normal-temperature solubility, no toxicity, no harm, convenient use, low dosage, easy treatment of concentrate and the like, can realize the selective inhibition of iron oxide minerals in the floatation of the high-iron cassiterite sulfide slime ore with small dosage, and can further improve the quality of the concentrate. Before flotation, the pH value of ore pulp is adjusted to 6-8 by using a sodium carbonate solution, and a small amount of sodium tripolyphosphate solution is added in the rough concentration process to effectively inhibit iron oxide minerals, so that the quality of the floated concentrate is further improved.

Drawings

FIG. 1 is a flow chart of the method of the present invention.

Detailed Description

The present invention will be described in further detail with reference to examples and comparative examples, but the scope of the present invention is not limited to the examples.