CN-119972364-B - Medicament for promoting floatation separation of iron ore and associated iron-containing silicate and floatation method

Abstract

The invention discloses a flotation separation reagent for promoting floatation of iron ore and associated iron-containing silicate, which is used for reverse flotation for adsorbing and floating excessive Ca 2+ ions in circulating water and selectively separating specularite and chlorite, the agent is sequentially added in sequence and reverse flotation operation is carried out under a proper pH environment, so that floatability difference between iron ore and iron-containing silicate can be effectively promoted, redundant Ca 2+ in flotation circulating water is reduced, and the quality of iron concentrate can be improved through reverse flotation means. The method has higher applicability to flotation environment, can keep good flotation performance in the common environment with pH=6-8, can achieve excellent separation effect under the condition of low dosage, and can effectively improve the excess of Ca 2+ ions caused by the collapse of the mining filling body and the mixing of concentrate. Compared with the traditional iron ore inhibitor starch and dextrin which are independently used, the invention can obtain better iron ore concentrate indexes by using a pre-adsorption agent system through a reverse flotation method, and simultaneously further reduces the phenomenon of excessive entrainment of concentrate gangue and dissolved Ca 2+ ions.

Inventors

• LI MINGYANG
• ZHANG PENGPENG
• SONG GUOQI
• SHI XIAOLONG
• GAO XIANGPENG
• ZHANG HAO

Assignees

• 安徽工业大学

Dates

Publication Date

20260512

Application Date

20250327

Claims (9)

1. 1. A reagent for promoting flotation separation of iron ore and associated iron-containing silicate, which is characterized by comprising a component A, an inhibitor B and a collector; the component A is a compound with at least one of the structural formulas shown in the formula 1 or the formula 2; wherein, formula 1: ; Wherein the R 1 group is C 2 ~C 6 alkyl, phenyl, substituted phenyl or amido; Wherein, formula 2: ; Wherein the R 2 group is a substituent group with a structure shown in a formula 3 or a substituent group which is the same as the R 1 group; Wherein, formula 3: ; Or alternatively, the first and second heat exchangers may be, ; Wherein, X is one of H, na and K; Wherein Y is one of N, C elements; Wherein R 3 、R 4 is independently one of H, C 1 ～C 3 alkyl; the collector is a fatty acid anion collector; The inhibitor B is dextrin.
2. 2. The agent for promoting flotation separation of iron ore and associated iron-containing silicate according to claim 1, wherein the mass ratio of the component A to the inhibitor B to the collector is (0.15-1.5): (0.25-3): 1.
3. 3. A method for facilitating flotation separation of iron ore and associated iron-containing silicate, characterized in that iron ore and iron-containing silicate minerals are crushed, sorted and ground, the minerals are mixed and stirred uniformly, the pH of ore pulp is regulated to 6-10, the concentration of ca 2+ ions is 50-200 mg/L, and a flotation operation is performed by adding a reagent for facilitating flotation separation of iron ore and associated iron-containing silicate according to any one of claims 1 to 2, and iron-containing silicate gangue is separated by reverse flotation.
4. 4. A method for facilitating flotation separation of iron ore from associated iron-containing silicate according to claim 3, wherein the slurry pH in the flotation is 6-8.
5. 5. The method for promoting flotation separation of iron ore and associated iron-containing silicate according to claim 3, wherein the amount of component A in the flotation process is 6-30 mg/L and the amount of inhibitor B is 30-90 mg/L.
6. 6. The method for promoting flotation separation of iron ore and associated iron-containing silicate according to claim 3, wherein the amount of collector used in the flotation process is 30-70 mg/L.
7. 7. The method for promoting flotation separation of iron ore and associated iron-containing silicate according to claim 6, wherein the amount of collector used in the flotation process is 40-50 mg/L.
8. 8. A method of facilitating flotation separation of iron ore from associated iron-containing silicate according to claim 3 wherein the temperature of the flotation slurry is 15 to 40 ℃.
9. 9. A method of facilitating flotation separation of iron ore from associated iron-containing silicate according to claim 3, wherein the iron-containing silicate gangue comprises at least one of chlorite, aegirine, quartz and feldspar, and the iron ore is fine iron ore.

Description

Medicament for promoting floatation separation of iron ore and associated iron-containing silicate and floatation method Technical Field The invention belongs to the field of iron-containing silicate iron ore reverse flotation, and particularly relates to a reagent for promoting flotation separation of iron ore and associated iron-containing silicate and a flotation method. Background Iron ore is one of important strategic mineral resources developed in industry all over the world as an important raw material for the steel industry. Although China has rich iron ore reserves, compared with other countries, the iron ore resources in China generally have the characteristics of lean, fine, impurity and the like, most iron ore types have complex components, difficult ore dressing and large proportion of multicomponent (companion) raw ore, and the separation difficulty is large. Specularite is used as a common ferric oxide mineral and is associated with iron-containing silicate gangue chlorite in nature, the specific magnetization coefficient and density of the two minerals are close, meanwhile, the chlorite has low hardness and fine particle size distribution, is easy to crush in the crushing process, and can be wrapped on the surfaces of iron concentrate particles in a mud cladding mode in the grinding process, so that the separation effect is seriously affected. And a reverse flotation means is used for fine fraction minerals, so that a better concentrate index can be obtained. Furthermore, during the underground mining of iron ores, the filling of the already solidified filling material in the vicinity of the mining area inevitably collapses during the mining and enters the flotation system with the raw ore. The large amount of Ca-containing substances (metallurgical slag, gypsum and the like) contained in the filling body causes a large amount of Ca 2+ to be dissolved out in the grinding and stirring processes, and the dissolved Ca 2+ does not need to additionally add an activating agent in the original anion reverse flotation system, but excessive Ca 2+ not only consumes a collecting agent in ore pulp to cause the grade reduction of flotation concentrate, but also greatly enhances the ionic strength of ore pulp solution, increases the viscosity of ore pulp, causes the dispersion of ore pulp to be poor, causes the problems of difficult defoaming, serious flotation running groove and the like, and simultaneously causes the subsequent impurity removal process to become more complicated. Under the condition of adding a large amount of calcium remover sodium carbonate, the actual production can only marginally maintain the flotation index by increasing the dosages of the inhibitor and the collector, thereby causing great resource waste and cost consumption. Therefore, how to use a novel medicament or process to improve the separation effect and remove the superfluous Ca 2+ mixed into the ore pulp by the filling body in the mining process has important research significance for the efficient utilization of the iron-containing silicate. Disclosure of Invention The technical problems to be solved by the invention are as follows: The separation efficiency of the iron-containing silicate type iron ore is low, the concentration of calcium ions in ore pulp circulating water caused by ore field filler caving influences the flotation selectivity, and the cost of removing calcium in actual production is high. In order to solve the technical problems, the inventor obtains the technical scheme of the invention through practice and summary, and the invention adopts the following technical scheme: an agent for promoting flotation separation of iron ore and associated iron-containing silicate comprises a component A, an inhibitor B and a collector; The component A is at least one compound with a structural formula of formula 1 or formula 2; wherein, formula 1: Wherein the R 1 group is C 2～C6 alkyl, phenyl, substituted phenyl or amido Wherein, formula 2: Wherein the R 2 group is a substituent group with a structure shown in a formula 3 or a substituent group which is the same as the R 1 group; Wherein, formula 3: wherein X is at least one of H, na, K and other elements; wherein Y is at least one of N, C and other elements; Wherein R 3、R4 is independently at least one of the alkyl groups of H, C 1～C3; The collector is a fatty acid anion collector, and the actual production condition is simulated by using excessive Ca 2+ ions; The inhibitor B is a small molecule iron ore inhibitor. Preferably, the inhibitor B is one or more of dextrin and modified starch. Preferably, the mass ratio of the component A to the inhibitor B to the collector is (0.15-1.5): (0.25-3): 1. A method for promoting flotation separation of iron ore and associated iron-containing silicate comprises the steps of crushing, sorting and grinding iron ore and iron-containing silicate minerals, mixing and stirring the minerals uniformly, regulating the pH of ore pulp