A chelating agent MHA used in pyrite beneficiation and a synthesis method thereof

Abstract

The present invention relates to a chelating agent MHA applied to pyrite beneficiation, wherein the chelating agent MHA is composed of the following raw materials in parts by weight: 2-5 parts of tartronic acid, 1-3 parts of copper sulfate, and 0.1-0.3 parts of palladium chloride dihydrate. At the same time, the present invention also discloses a synthesis method of the chelating agent MHA. The present invention performs addition polymerization, hydrolysis, and chelation reactions to generate a chelate with a six-membered ring, and the obtained chelate has good stability and is easily soluble in water, and can effectively control the distribution amount of orpyrite in pyrite concentrate and iron concentrate.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, and in particular to a chelating agent MHA used in pyrite beneficiation and a synthesis method thereof. Background Art

[0002] Pyrite containing pyrite mainly exists in the form of pyrite, and the content of magnetite is very low. It is a difficult ore to be separated because pyrite is both floatable and magnetic. Pyrite can enter the sulfur concentrate through flotation and can also enter the iron concentrate through pyrite separation. Therefore, the difficulty of beneficiation of pyrite containing pyrite lies in the distribution of pyrite in pyrite, that is, the orientation of pyrite.

[0003] Since the properties of pyrite and orpyrite are similar, and the current sulfur activators are mainly copper sulfate, oxalic acid, ammonium carbonate, ammonium sulfate, etc., and most activators are active to both pyrite and orpyrite, it is difficult to separate pyrite and orpyrite during the flotation process. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a chelating agent MHA which has good stability and is easily soluble in water and is applied to pyrite beneficiation.

[0005] Another technical problem to be solved by the present invention is to provide a method for synthesizing the chelating agent MHA.

[0006] In order to solve the above problems, the present invention discloses a chelating agent MHA for pyrite beneficiation, characterized in that the chelating agent MHA is composed of the following raw materials in parts by weight: 2 to 5 parts of tartronic acid, 1 to 3 parts of copper sulfate, and 0.1 to 0.3 parts of palladium chloride dihydrate.

[0007] The method for synthesizing the chelating agent MHA used for pyrite beneficiation as described above is characterized in that: firstly, the weights are weighed according to the ratio, and then succinic acid, copper sulfate, and palladium chloride dihydrate are added into a container, and the chelating reaction is carried out at 15-30° C. for 30-50 minutes to obtain the chelating agent MHA.

[0008] The use of the chelating agent MHA for pyrite beneficiation as described above in pyrite containing orpyrite is characterized in that the sulfur grade in the ore selected by the chelating agent MHA is 22-26%, the total iron grade is 30-35%, the magnetite content accounts for 6%-8% of the total iron, and the orpyrite content accounts for 15%-17% of the total iron.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] 1. In the present invention, the chelating agent MHA preferentially reacts with the surface of the more active pyrite to generate a double decomposition reaction, and at the same time generates an activated film, which is easy to react with the collector, and the chemical adsorption rate of the collector to pyrite is increased and activated. The reason is that although pyrite and orpiperidin are similar in nature, the floatability of pyrite is better than that of pyrrhotite, and the chelating agent preferentially selects the more active pyrite to react. When the pyrite is activated substantially completely, the chelating agent will choose to react with orpiperidin. Therefore, when the dosage of the chelating agent is controlled well, the effect of the chelating agent and orpiperidin is not obvious, and only a small part of orpiperidin is activated. The chelating agent can expand the floatability gap between pyrite and orpiperidin, and provide room for the distribution of orpiperidin, and then can effectively control the distribution amount of orpiperidin in sulfur concentrate and iron concentrate, and improve the recovery rate of sulfur and iron as much as possible, and improve the utilization rate of resources.

[0011] 2. The chelating agent MHA of the present invention uses tartronic acid, copper sulfate, and palladium chloride dihydrate as raw materials, and undergoes addition polymerization, hydrolysis, and chelation reactions to generate a chelate with a six-membered ring. The chelate has a special structure in which each bond angle reaches a stable value. Therefore, the chelating agent has good stability and is easily soluble in water.

[0012] 3. The preparation method of the present invention is simple, the synthesis cost is low, and it has wide promotion and application value. DETAILED DESCRIPTION

[0013] A chelating agent MHA used for pyrite beneficiation. The chelating agent MHA is composed of the following raw materials in parts by weight (g): 2-5 parts of tartronic acid, 1-3 parts of copper sulfate, and 0.1-0.3 parts of palladium chloride dihydrate.

[0014] The synthesis method thereof is as follows: firstly weigh according to the ratio, then add succinic acid, copper sulfate and palladium chloride dihydrate into a container, and carry out chelation reaction at 15-30°C for 30-50 minutes to obtain a chelating agent MHA with good stability.

[0015] Application of the chelating agent MHA in pyrite containing orpyrite: The sulfur grade in the ore selected by the chelating agent MHA is 22-26%, the total iron grade is 30-35%, and the pyrite content is relatively high, the magnetite content is relatively low, accounting for 6%-8% of the total iron, and the orpyrite content accounts for 15%-17% of the total iron.

[0016] Example 1

[0017] 4 g of tartronic acid, 3 g of copper sulfate, and 0.2 g of palladium chloride dihydrate were placed in a beaker, heated to 30°C, and the chelation time was 50 minutes to obtain a chelating agent MHA with good stability.

[0018] A pyrite mine in Qinghai has a high content of pyrite and a low content of magnetite. The sulfur grade of the original ore is 24.78%, the iron content is 33.46%, the magnetite content accounts for 7.2% of the total iron, and the pyrite content accounts for 15.8% of the total iron.

[0019] The chelating agent dosage tests were carried out respectively, and the test results are shown in Table 1 below. The iron phase analysis results of the sulfur concentrate are shown in Table 2.

[0020] Table 1 Chelating agent dosage test results

[0021]

[0022] Table 2 Analysis results of sulfur concentrate mineral phase (%)

[0023]

[0024] It can be analyzed from Table 1 that with the increase of MHA dosage, the recovery rates of sulfur and iron both increase, indicating that MHA has an activation effect on sulfur and iron. It can be seen from Table 2 that when the MHA dosage is controlled within 100g / t, the magnetic iron content is very low, indicating that the orpiment content is very low. When the MHA dosage is greater than 100g / t, the magnetic iron content increases rapidly, indicating that the orpiment has been activated at this time. It can be seen from Tables 1 and 2 that MHA has a preferential activation effect on pyrite. With the increase of MHA dosage, after pyrite is fully activated, MHA can also activate orpiment. Therefore, in order to achieve the separation of pyrite and orpiment, it is necessary to control the dosage of MHA, expand the gap in the floatability of pyrite and orpiment, and then achieve the reasonable distribution of orpiment in sulfur concentrate and iron concentrate.

[0025] Example 2

[0026] Place 3 g of tartronic acid, 2 g of copper sulfate, and 0.1 g of palladium chloride dihydrate in a beaker, heat to 20°C, and chelate for 40 minutes to obtain a chelating agent MHA with good stability.

[0027] Process mineralogy research on a pyrite mine in Inner Mongolia shows that sulfur exists mainly in the form of pyrite and orpyrite, and iron exists mainly in the form of orpyrite and magnetite, with a relatively low content of magnetite. The sulfur grade of the original ore is 23.15%, the iron content is 32.54%, the magnetite content accounts for 6.5% of the total iron, and the orpyrite content accounts for 15.5% of the total iron.

[0028] Comparative tests were conducted with and without the addition of a chelating agent. The test results are shown in Table 3. The results of the iron phase analysis of the sulfur concentrate are shown in Table 4.

[0029] Table 3 Chelating agent dosage test results

[0030]

[0031] Table 4 Analysis results of iron phase in sulfur concentrate (%)

[0032]

[0033] It can be analyzed from Table 3 that with the increase of MHA dosage, the recovery rates of sulfur and iron both increase, indicating that MHA has an activation effect on sulfur and iron. It can be seen from Table 4 that when the MHA dosage is controlled within 100g / t, the magnetic iron content is very low, indicating that at this time, MHA activates pyrite and orpiment is not activated. When the MHA dosage is greater than 100g / t, the magnetic iron content increases rapidly, indicating that orpiment has been activated at this time. It can be seen from Tables 3 and 4 that MHA preferentially activates pyrite. With the increase of MHA dosage, after pyrite is fully activated, MHA can also activate orpiment. Therefore, in order to separate pyrite from orpiment, the dosage of MHA must be controlled.

Claims

1. A chelating agent MHA applied to pyrite beneficiation, Characterized in that: The chelating agent MHA is composed of the following raw materials in parts by weight: 2 - 5 parts of malonic acid, 1 - 3 parts of copper sulfate, 0.1 - 0.3 parts of palladium chloride dihydrate; and the raw materials undergo a chelation reaction to form a chelate with a six - membered ring.

2. A synthesis method of a chelating agent MHA applied to pyrite beneficiation according to claim 1, Characterized in that: First, weigh according to the ratio, then add malonic acid, copper sulfate, and palladium chloride dihydrate into a container, and carry out a chelation reaction at 15 - 30 °C for 30 - 50 min to obtain the chelating agent MHA.

3. An application of a chelating agent MHA applied to pyrite beneficiation according to claim 1 in pyrite containing arsenopyrite, Characterized in that: The sulfur grade in the ore selected by the chelating agent MHA is 22 - 26%, the total iron grade is 30 - 35%, the magnetite content accounts for 6% - 8% of the total iron, and the arsenopyrite content accounts for 15% - 17% of the total iron.

Images