CN105344487A - Regulator for bauxite direct flotation and using method thereof - Google Patents

Abstract

The invention discloses a regulator for bauxite direct flotation and a using method thereof. The regulator of the invention is a modified phosphate, and the main component is potassium hydroxyethylidene diphosphonate or sodium hydroxyethylidene diphosphonate. The using method comprises the following steps: when the bauxite direct flotation is carried out, the bauxite grinding product with the aluminum-silicon ratio of 3-5 has the granularity property of minus 0.074mm and accounts for 80-90%, the pH value of a flotation system is controlled to be 9-11, sodium oleate is used as a collecting agent, the using amount is 500-1200g/t, and the using amount of the regulator is 60-70 g/t. The application of the invention in the bauxite direct flotation desilication process can enhance the selective inhibition effect on the silicon-containing minerals and enhance the inhibition effect on the inevitable ions (Ca)²⁺、Mg²⁺Etc.) and improving the effect of direct flotation of bauxite.

Description

A kind of adjusting agent for positive flotation of bauxite and its application method

technical field

The invention relates to the field of mineral processing engineering, in particular to a regulator for positive flotation of bauxite and a using method thereof, which belongs to resource comprehensive utilization engineering.

Background technique

Most of the bauxite resources in my country belong to diaspore type bauxite, among which the proportion of high-quality bauxite with aluminum-silicon ratio greater than 7 is very small, and more than 80% of the diaspore-type bauxite with aluminum-silicon ratio is less than 7, and the bauxite with an aluminum-silicon ratio of 3-5 accounts for the vast majority. This part of resources must be desiliconized, enriched and upgraded through mineral processing methods, so that the aluminum-silicon ratio is greater than 7, so as to meet the minimum requirements of the lime-Bayer process. Flotation is the main method of beneficiation and desiliconization, and positive flotation is undoubtedly the most successful bauxite flotation method at present. During the positive flotation of bauxite, according to the main mineral composition characteristics of diaspore type bauxite, sodium carbonate is used as the pulp pH regulator, and water glass, sodium hexametaphosphate, polyphosphate, etc. are used as aluminosilicate As a regulator of salt minerals, oxidized paraffin soap or sodium oleate is used as a collector to separate the diaspore and fulminite in the ore, so as to realize the flotation desiliconization of bauxite.

In the process of positive flotation of bauxite, the selective suppression of kaolinite, pyrophyllite, illite and other silicon-containing minerals and the elimination of unavoidable ions in the slurry will play a decisive role in the positive flotation of bauxite. The role of the regulator is to efficiently inhibit silicon-containing minerals and eliminate the inevitable impact of ions, while not inhibiting the diaspore.

At present, water glass, sodium hexametaphosphate, polyphosphate, etc. are mainly used as regulators for silicon-containing minerals in bauxite positive flotation. These regulators can also react with inevitable ions. But the main shortcoming of these regulators is: consumption is bigger, also has inhibitory effect to diaspore, especially under the condition of large dosage, often to the inhibition of diaspore stronger, thereby causes the decline of Al2O3 recovery rate At the same time, the elimination of unavoidable ions in the pulp by sodium hexametaphosphate and other regulators is done through complexation, which often requires the consumption of a large amount of sodium hexametaphosphate, and the effect is also average, resulting in a general positive flotation effect.

Contents of the invention

In order to overcome the above defects, the present invention provides a regulator for bauxite positive flotation and its application method. Applying the present invention to the bauxite positive flotation desiliconization process can enhance the selectivity to silicon-containing minerals At the same time, it can enhance the ability to eliminate unavoidable ions (Ca ²⁺ , Mg ²⁺ , etc.), and improve the effect of positive flotation of bauxite.

In order to achieve the above objectives, the technical solution adopted in the present invention is: a positive flotation regulator for bauxite, which is a modified phosphate, the main component of which is potassium hydroxyethylidene diphosphonate or hydroxyethylene diphosphonate Sodium ethyl diphosphonate, its structural formula is:

A method for using a bauxite positive flotation regulator. When performing bauxite positive flotation, the particle size of the bauxite grinding product with an aluminum-silicon ratio of 3-5 is -0.074mm, accounting for 80-90 %, the pH value of the flotation system is controlled at 9-11, sodium oleate is used as a collector, and the dosage is 500-1200g/t, and the dosage of the regulator described in the present invention is 60-70g/t.

Furthermore, when the dosage of the new inhibitor is 60g/t, for bauxite with an aluminum-silicon ratio of 4-5, the particle size of the product is -0.074mm, accounting for 80%-85%, and the alkalinity of the flotation system is controlled as pH =10-11, using sodium oleate as collector, the dosage is 800-1200g/t.

Further, the dosage of the bauxite positive flotation regulator is 60g/t.

Further, the pH value of the flotation system is 10.

Further, the dosage of the collector sodium oleate is 700g/t.

Beneficial effects of the present invention: 1. The present invention is a regulator for bauxite positive flotation, a modified phosphate, the molecular structure of which contains multiple modified phosphate groups. The functional group of the new modifier sodium (potassium phosphate) is a plurality of modified phosphate functional groups, its solubility is extremely strong, and its appearance is a transparent yellow liquid. After it is modified by organic compounding, the molecular spatial configuration of the phosphate radical changes, thereby It can chelate with the surface of aluminosilicate minerals, greatly enhancing the selective inhibition effect, while the inhibition effect on diaspore is general;

Using the present invention to inhibit aluminosilicate minerals in bauxite, through efficient chelation inhibition, can effectively selectively inhibit aluminosilicate minerals such as kaolinite, illite, pyrophyllite, and can efficiently eliminate ore pulp The unavoidable cations in the flotation effect will promote the effective separation of diaspore and silicon-containing minerals.

2. At the same time, its molecular structure contains multiple modified phosphate functional groups. These functional groups can directly react with cations such as Ca2+ and Mg2+, which greatly increases the ability to eliminate unavoidable ions in the pulp, and can effectively eliminate the influence of unavoidable ions. Improve the effect of positive flotation of bauxite.

3. For bauxite with an aluminum-silicon ratio of about 3-5, under the same other process conditions, after using the present invention, compared with the conventional regulator sodium hexametaphosphate, the aluminum-silicon ratio of the concentrate can be increased by 1-2 , improve the recovery rate of Al ₂ O ₃ by 10-20%.

detailed description

In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below in conjunction with specific examples. The description in this part is only exemplary and explanatory, and should not have any limitation on the protection scope of the present invention effect.

Example 1:

A positive flotation regulator for bauxite, it is a modified phosphate, the main component is potassium hydroxyethylene diphosphonate, and its structural formula is:

The composition of bauxite in Xiaoguan Mining Area, Henan Province is shown in Table 1.

Table 1 Chemical multi-element analysis of raw ore

element Al ₂ O ₃ SiO _{2 Fe2O3 _} TiO ₂ CaO MgO K ₂ O Na ₂ O S A/S content(%) 58.85 11.79 10.86 2.65 0.68 0.29 1.34 0.078 0.22 4.99

The positive flotation process system is: the particle size of the bauxite grinding product is -0.074mm, accounting for 85%, the alkalinity of the flotation system is controlled to be pH=10, and sodium oleate is used as the collector, and the dosage is 500- 800g/t, the amount of regulator is 60g/t, and the beneficiation process is a roughing open circuit process. Compared with the conventional regulator sodium hexametaphosphate, the test results are shown in Table 2.

Table 2 Regulator comparative test results

The test results show that the special-effect regulator of the present invention can significantly strengthen the selective inhibition of silicon-containing minerals, improve the flotation process index, the aluminum-silicon ratio of the rough concentrate is increased from 8.29 to 8.41, and the recovery rate of alumina is from 8.29 to 8.41. 53.12% improved to 78.62%.

Example 2:

A positive flotation regulator for bauxite, which is a modified phosphate, the main component is sodium hydroxyethylene diphosphonate, and its structural formula is:

The composition of bauxite in Xiaoguan Mining Area, Henan Province is shown in Table 1.

The positive flotation process system is: the particle size of the bauxite grinding product is -0.074mm, accounting for 85%, the alkalinity of the flotation system is controlled to be pH=9, and sodium oleate is used as the collector, and the dosage is 700- 1100g/t, the amount of regulator is 70g/t, and the beneficiation process is a roughing open circuit process. Compared with the conventional regulator sodium hexametaphosphate, the test results are shown in Table 2.

Table 2 Regulator comparative test results

The test results show that the special-effect regulator of the present invention can significantly strengthen the selective inhibition of silicon-containing minerals, improve the flotation process index, the aluminum-silicon ratio of the coarse concentrate is increased from 8.09 to 8.51, and the recovery rate of alumina is from 8.09 to 8.51. 52.12% improved to 79.62%.

It should be noted that, in this document, the terms "comprising", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or apparatus.

In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the method and core idea of the present invention. The above is only a preferred embodiment of the present invention. It should be pointed out that due to the limitation of literal expression, there are objectively unlimited specific structures. Under these circumstances, several improvements, modifications or changes can also be made, and the above-mentioned technical features can also be combined in an appropriate manner; these improvements, modifications, or combinations, or the idea and technical solution of the invention can be directly applied to other occasions without improvement should be regarded as the protection scope of the present invention.

Claims (6)

1. A positive flotation regulator for bauxite, characterized in that: it is a modified phosphate, the main component of which is potassium hydroxyethylene diphosphonate or sodium hydroxyethylene diphosphonate. The structural formula is: 2. a using method for bauxite positive flotation regulator as claimed in claim 1, characterized in that: when carrying out bauxite positive flotation, the bauxite grinding of aluminum-silicon ratio 3-5 The particle size of the product is -0.074mm, accounting for 80-90%. The pH value of the flotation system is controlled at 9-11. Sodium oleate is used as a collector, and the dosage is 500-1200g/t. The adjustment of the present invention The dosage is 60-70g/t. 3. the using method for bauxite positive flotation adjustment agent according to claim 2, is characterized in that, when the novel depressant dosage is 60g/t, for the bauxite of aluminum-silicon ratio 4-5, product The particle size property is -0.074mm particle size accounts for 80%-85%, the alkalinity of the flotation system is controlled to be pH=10-11, and sodium oleate is used as the collector, and the dosage is 800-1200g/t. 4. The method for using the bauxite positive flotation regulator according to claim 2, characterized in that: the dosage of the bauxite positive flotation regulator is 60g/t. 5. The method for using the bauxite positive flotation regulator according to claim 2, characterized in that: the pH value of the flotation system is 10. 6. The method for using the bauxite positive flotation regulator according to claim 2, characterized in that: the amount of the collector sodium oleate is 700g/t.