CN108940603B - Combined collecting agent for improving production index of carbon-containing gold ore and application of combined collecting agent in flotation of carbon-containing gold ore - Google Patents

Abstract

The invention belongs to the field of metal ore dressing, and relates to a combined collecting agent for improving the production index of carbon-containing gold ores and application thereof in flotation of the carbon-containing gold ores, wherein the combined collecting agent comprises the following components in parts by weight: 3-6 parts of collecting agent J-622, 2-3 parts of ammonium nitrate black powder, 0.5-1 part of kerosene and 0.5-1 part of OP-10. Flotation step: firstly grinding ore, adding sodium hydroxide as a regulator and MFA as a water purifying agent for size mixing. Adding an activating agent and a collecting agent for quick flotation to obtain gold concentrate 1 and rougher tailings, regrinding the rougher tailings, adding a water purifying agent MFA during regrinding, and performing flotation to obtain gold concentrate 2 and tailings. And the gold concentrate 1 and the gold concentrate 2 are used as qualified gold concentrate products. The combined collecting agent utilizes a dispersion-aiding mechanism, increases the dissolution dispersion degree of the agent in ore pulp, greatly reduces the consumption of the collecting agent, greatly improves the collecting capacity of gold, reduces the agent cost and improves the economic benefit of enterprise production.

Description

Combined collecting agent for improving production index of carbon-containing gold ore and application of combined collecting agent in flotation of carbon-containing gold ore

Technical Field

The invention belongs to the technical field of metal beneficiation, relates to a collecting agent for flotation, and particularly relates to a combined collecting agent for improving the production index of carbon-containing gold ores and flotation application thereof.

Background

Carbonaceous gold ores are difficult to beneficiate, primarily because it is often difficult to achieve desirable results with conventional flotation reagents. At present, more collecting agents for sorting carbonaceous gold ores exist, but the problems of poor sorting effect, high beneficiation cost due to large medicament consumption, poor sorting effect and the like exist in the conventional single collecting agent, and part of combined collecting agents have poor stability and are difficult to disperse in ore pulp. In addition, in the field actual production, carbon is used as a gold carrier, and often adsorbs a certain amount of gold to enter a thickener to overflow, so that the gold recovery rate is low, and the carbon enters return water to deteriorate the whole flotation system, so that the mineral separation index is poor.

Disclosure of Invention

The invention provides a combined collecting agent for improving the production index of carbon-containing gold ores and application thereof, and solves the problems of instability, low solubility and dispersion degree, high agent consumption and the like of the conventional combined agent at present.

The technical scheme of the invention is as follows: a combined collector for improving the production index of carbon-containing gold ores is characterized in that: comprises the following components in parts by weight: 3-6 parts of collecting agent J-622 (mainly composed of diethyl azocrylonitrile ester, alkyl or aryl nigrosine, alcohol foaming agent and pine oil foaming agent), 2-3 parts of butylammonium nigrosine, 0.5-1 part of kerosene and 0.5-1 part of OP-10 (octylphenol polyoxyethylene ether-10).

A process for carrying out flotation on carbon-containing gold ores by using the combined collecting agent comprises the following steps:

the ore grinding process comprises the following steps: the ore grinding is stopped when the ore pulp concentration is 50-60%, the adjusting agent sodium hydroxide and the water purifying agent MFA are added, the using amount of the sodium hydroxide is 1500-2500 g/t of raw ore, the using amount of the water purifying agent MFA is 1000-4000 g/t of raw ore, and the mass ratio of the fineness of the ore smaller than 0.044mm reaches 65-75%;

quick flotation: adjusting the concentration of ore pulp of the ore grinding ore pulp obtained in the step I to be 30-50%, adding an activating agent copper sulfate, wherein the adding amount of the copper sulfate is 100-300 g/t of ore pulp, adding the combined collecting agent in the claim 1, wherein the using amount of the combined collecting agent is 500-800 g/t of ore pulp, and obtaining gold concentrate and tailings after flotation;

thirdly, regrinding the roughed tailings: regrinding the tailings obtained in the second step, wherein the grinding concentration is 45-55%, adding water purifying agent MFA, roughly selecting the tailings with the use amount of 500-1500 g/t of MFA, and stopping grinding when the mass ratio of the mineral fineness less than 0.044mm reaches 90-98%;

flotation of roughed tailings: adjusting the concentration of the ore pulp of the roughed tailings after regrinding to be 25-35%, adding an activating agent copper sulfate, wherein the using amount of copper sulfate is 50-300 g/t of ore pulp, adding the combined collecting agent in the claim 1, wherein the adding amount of the combined collecting agent is 200-400 g/t of ore pulp, performing rougher flotation and scavenging to obtain tailings flotation gold concentrate and final tailings, and combining the gold concentrate obtained in the step II with the tailings flotation gold concentrate to obtain qualified gold concentrate.

During ore grinding, production backwater or overflow water of a thickener is used as ore grinding water, and the solid content of the ore grinding water is 6.5-8.0%.

The water purifying agent MFA added in the first step and the third step is prepared by mixing ferric sulfate, magnesium chloride and sodium acrylate, and the component ratio is 1:1.5: 0.5-3.

The invention has the beneficial effects that: (1) the combined collector J-622, the ammonium nitrate black powder and the kerosene are combined to play a role in efficiency complementation, the selective collecting capacity of gold is improved, and then the OP-10 emulsifier is added, so that the dissolving dispersity of the reagent in the ore pulp is increased, and the consumption of the collector is reduced. The combined collecting agent provided by the invention is simple in composition, good in stability and low in price, and has a collecting and foaming effect; (2) adding water purifying agent MFA during ore grinding, wherein the MFA is a composite inhibitor and mainly has the function of forming molecular chain bridging, so that carbon particles suspended in return water and gold particles adsorbed by carbon form a flocculation macromolecular structure to be settled, thereby achieving the purpose of purifying the return water; (3) and after coarse grinding, quick flotation is carried out, so that on one hand, the circulating accumulation of carbon in a loop is prevented from deteriorating a flotation system, and on the other hand, gold is prevented from being formed into a sheet shape by multiple grinding and pressing to reduce floatability, so that the flotation recovery rate is reduced. The process has the characteristics of low production cost, high recovery rate, strong adaptability, wide application range and the like, and realizes the high-efficiency recovery of the carbon-containing gold ores.

Drawings

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

Detailed Description

Example 1

The combined collecting agent used in the flotation comprises the following components in parts by weight: j-622, 4 parts; 2.5 parts of ammonium dimyristate; 0.7 part of kerosene; OP-10, 0.8 part.

The flotation process comprises the following steps: the gold grade of a certain carbon-containing gold ore in Gansu is 5.43g/t, the carbon-containing and low-sulfide carbonate type gold ore has the ore grinding concentration of 55 percent, the ore grinding is carried out by using production backwater (the solid content is 7.0 percent), sodium hydroxide is added, the using amount is 2000g/t, a water purifying agent MFA is used, the using amount is 2000g/t, and the content of the ground ore with the fineness of less than 0.044mm is 70 percent. Adjusting the concentration of the ore pulp to 35%, adding an activating agent copper sulfate with the dosage of 200g/t, and adding 650g/t of a combined collecting agent to produce gold concentrate 1 and rougher tailings. Adding water purifying agent MFA1000g/t into the roughed tailings, the content of the regrinding degree is less than 0.044mm and is 95%, adjusting the pulp concentration of the roughed tailings after regrinding to be 30%, adding copper sulfate with the dosage of 100g/t, and combining collecting agent with 300g/t, performing rough concentration and scavenging to obtain gold concentrate 2 and tailings. Finally obtaining qualified gold concentrate with the gold grade of 56.37g/t and the gold recovery rate of 88.42 percent.

The used water purifying agent MFA is prepared by mixing ferric sulfate, magnesium chloride and sodium acrylate, and the component ratio is 1:1.5: 2.

Example 2

The combined collecting agent used in the flotation comprises the following components in parts by weight: j-622, 3 parts; 2 parts of ammonium dimyristate; 0.5 part of kerosene; OP-10, 0.5 part.

The flotation process comprises the following steps: the gold grade of a certain carbon-containing gold ore in Gansu is 5.65g/t, the carbon-containing and low-sulfide carbonate type gold ore has the ore grinding concentration of 50 percent, the ore is ground by overflowing a thickener (the solid content is 6.5 percent), sodium hydroxide is added, the using amount is 1500g/t, a water purifying agent MFA is used, the using amount is 1000g/t, and the content of the ground ore with the fineness of less than 0.044mm is 65 percent. Adjusting the concentration of the ore pulp to be 30%, adding an activating agent copper sulfate with the dosage of 100g/t, and adding a combined collecting agent with the dosage of 500g/t to produce gold concentrate 1 and rougher tailings. Adding water purifying agent MFA1000g/t into the roughed tailings, controlling the regrinding degree to be less than 0.044mm and the content to be 90%, adjusting the pulp concentration of the roughed tailings after regrinding to be 25%, adding copper sulfate with the dosage of 100g/t, and combining collecting agent with 350g/t, and performing rough concentration and scavenging to obtain gold concentrate 2 and tailings. Finally obtaining qualified gold concentrate with the gold grade of 57.85g/t and the gold recovery rate of 86.64 percent.

The used water purifying agent MFA is formed by mixing ferric sulfate, magnesium chloride and sodium acrylate, and the component ratio is 1:1.5: 0.5.

Example 3

The combined collecting agent used in the flotation comprises the following components in parts by weight: j-622, 6 parts; 3 parts of ammonium dimyristate; 1 part of kerosene; OP-10, 1 part.

The flotation process comprises the following steps: the carbon-containing gold ore of Xinjiang has the gold grade of 4.47g/t, belongs to the carbon-containing gold ore, has the ore grinding concentration of 60 percent, uses production backwater (the solid content is 8 percent) for grinding, adds sodium hydroxide with the dosage of 1800g/t, uses water purifying agent MFA with the dosage of 1500g/t, and has the ore grinding fineness of less than 0.044mm and the content of 65 percent. Adjusting the concentration of the ore pulp to 38%, adding an activating agent copper sulfate with the dosage of 220g/t, and adding 550g/t of a combined collecting agent to produce gold concentrate 1 and rougher tailings. Adding water purifying agent MFA1000g/t into the roughed tailings, the content of regrinding degree smaller than 0.044mm is 97%, adjusting the pulp concentration of the roughed tailings after regrinding to 35%, adding 80g/t of copper sulfate, and combining 250g/t of collecting agent, and performing rough concentration and scavenging to obtain gold concentrate 2 and tailings. Finally obtaining qualified gold concentrate with the gold grade of 56.42g/t and the gold recovery rate of 87.17 percent.

The used water purifying agent MFA is formed by mixing ferric sulfate, magnesium chloride and sodium acrylate, and the component ratio is 1:1.5: 3.

Claims (1)

1. A process for carrying out flotation on carbon-containing gold ores by using a combined collecting agent comprises the following components, by weight, 3-6 parts of the collecting agent J-622, 2-3 parts of butylammonium melanophore, 0.5-1 part of kerosene and 0.5-1 part of OP-10, wherein the combined collecting agent consists of J-622, butylammonium melanophore, kerosene and OP-10, and comprises the following steps:

the ore grinding process comprises the following steps: the concentration of ore pulp of ore grinding is 50-60%, production backwater or overflow water of a thickener is used as ore grinding water, the solid content of the ore grinding water is 6.5-8.0%, a regulator sodium hydroxide and a water purifying agent MFA are added, the using amount of the sodium hydroxide is 1500-2500 g/t of raw ore, the using amount of the water purifying agent MFA is 1000-4000 g/t of raw ore, and the ore grinding is stopped when the mass ratio of the fineness of the ore smaller than 0.044mm reaches 65-75%;

quick flotation: adjusting the ore pulp concentration of the ore grinding ore pulp obtained in the step I to be 30-50%, adding an activating agent copper sulfate, adding the copper sulfate into the ore pulp with the addition amount of 100-300 g/t, adding a combined collecting agent with the use amount of 500-800 g/t, and performing flotation to obtain gold concentrate and tailings;

thirdly, regrinding the roughed tailings: regrinding the tailings obtained in the second step, wherein the grinding concentration is 45-55%, adding water purifying agent MFA, roughly selecting the tailings with the use amount of 500-1500 g/t of MFA, and stopping grinding when the mass ratio of the mineral fineness less than 0.044mm reaches 90-98%;

flotation of roughed tailings: adjusting the concentration of the pulp of the roughed tailings after regrinding to be 25-35%, adding an activating agent copper sulfate, wherein the using amount of copper sulfate is 50-300 g/t pulp, adding a combined collecting agent, wherein the adding amount of the combined collecting agent is 200-400 g/t pulp, performing rougher flotation and scavenging to obtain tailings flotation gold concentrate and final tailings, and combining the gold concentrate obtained in the second step and the tailings flotation gold concentrate into qualified gold concentrate;

the water purifying agent MFA added in the first step and the third step is prepared by mixing ferric sulfate, magnesium chloride and sodium acrylate, and the component ratio is 1:1.5: 0.5-3.

Images