A combined reagent for improving the recovery rate of associated gold in lead-zinc ore and its application

Abstract

The present invention relates to a combined reagent for improving the recovery rate of associated gold in lead-zinc ore. The combined reagent consists of 1-butyl-3-methylimidazolium hydroxide, aniline dithiophosphate, and 25 # dithiophosphate. Meanwhile, the present invention also discloses the use of the combined reagent in the roughing operation of lead in the lead-zinc preferential flotation process for lead-zinc ore; wherein: aniline dithiophosphate and 25 # dithiophosphate are lead flotation collectors, 1-butyl-3-methylimidazolium hydroxide is a pulp conditioner, and 25 # dithiophosphate in the form of an oily liquid is added as the original solution, and aniline dithiophosphate and 1-butyl-3-methylimidazolium hydroxide are formulated into an aniline dithiophosphate solution with a mass concentration of 1-2% and then added. The present invention has the advantages of high recovery rate of associated gold, good selectivity for lead and gold minerals, simple reagent system, and strong process applicability under the condition of not reducing the lead-zinc flotation index.

Description

Technical Field

[0001] The present invention relates to the field of mineral processing engineering, and particularly to a combined reagent for improving the recovery rate of associated gold in lead-zinc ore and its application. Background Art

[0002] Gold and silver have an affinity for copper, sulfur, iron, and lead, and are often associated as associated resources in bornite, chalcopyrite, pyrite, sphalerite, and galena. For the associated gold in lead-zinc ore, enriching it in lead concentrate by using an effective beneficiation process can greatly improve the economic benefits of enterprises. In the lead-zinc preferential flotation process, lime, sodium carbonate and other pH adjusters are usually used to adjust the pulp to an appropriate pH value for lead mineral flotation, and then some zinc mineral inhibitors are added according to the situation. Then, xanthate, dithiophosphate, and sulfur-nitrogen reagents are used as collectors. Xanthate and sulfur-nitrogen collectors usually have good collecting effects under higher pulp pH conditions, while high pH is not conducive to the flotation of associated gold and silver in the ore. Therefore, dithiophosphate reagents are mostly used during lead preferential flotation. As a common lead collector, aniline dithiophosphate has the characteristics of good selectivity for lead and strong collecting ability for associated gold and silver. However, due to its poor solubility in low-alkali environments, the effective concentration of the reagent in the pulp is low, so it is less used industrially.

[0003] As a new type of organic solvent, ionic liquid can be designed into the required ionic liquid by incorporating different functional groups according to needs, so it is also called a "designer solvent". It usually has the advantages of accelerating the transport of drugs to the target site of action and increasing the solubility of drugs in water. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a combined reagent for improving the recovery rate of associated gold in lead-zinc ore with high recovery rate and good selectivity.

[0005] Another technical problem to be solved by the present invention is to provide the application of the combined reagent for improving the recovery rate of associated gold in lead-zinc ore.

[0006] To solve the above problems, a combined reagent for improving the recovery rate of associated gold in lead-zinc ore according to the present invention is characterized in that: the combined reagent is composed of 1-butyl-3-methylimidazolium hydroxide, aniline dithiophosphate and 25 # dithiophosphate.

[0007] The application of the combined reagent for improving the recovery rate of associated gold in lead-zinc ore as described above is characterized in that: the combined reagent is used for the rough lead selection operation in the lead-zinc preferential flotation process of lead-zinc ore; wherein: aniline dithiophosphate and 25 # dithiophosphate are lead flotation collectors, 1-butyl-3-methylimidazolium hydroxide is a pulp conditioner, and 25 in the form of an oily liquid #The dithiophosphate is added in its original solution state, and the aniline dithiophosphate is formulated into an aniline dithiophosphate solution with a mass concentration of 1-2% by mixing with 1-butyl-3-methylimidazolium hydroxide and then added.

[0008] The aniline dithiophosphate solution with a mass concentration of 1-2% refers to a solution prepared by dissolving 1-butyl-3-methylimidazolium hydroxide in water, adjusting the pH of the aqueous solution to 8-9, using this aqueous solution as the solvent, and aniline dithiophosphate as the solute, and mixing them evenly.

[0009] The pulp conditioner is added at 30-50 g per 1 t of pulp.

[0010] The lead floating collector is added at 60-90 g per 1 t of pulp.

[0011] The mass ratio of the aniline dithiophosphate to the 25 # dithiophosphate is 1 / 2-1 / 4.

[0012] The addition sequence of the combined reagent is to first add 1-butyl-3-methylimidazolium hydroxide, stir and react for 3-5 minutes, and then simultaneously add the aniline dithiophosphate solution with a mass concentration of 1-2% and the 25 # dithiophosphate original solution.

[0013] The present invention has the following advantages compared with the prior art:

[0014] 1. Aiming at the disadvantages that aniline dithiophosphate has strong collecting ability for gold-bearing lead minerals but poor water solubility, the present invention proposes to use organic ionic liquid as a cosolvent and conditioner. Under the condition of ensuring that the lead-zinc flotation indexes are not reduced, it has the advantages of high associated gold recovery rate, good selectivity for lead-gold minerals, simple reagent system, and strong process applicability.

[0015] 2. On the one hand, the present invention adds aniline dithiophosphate with good collecting performance for gold minerals. On the other hand, it uses the alkaline ionic liquid "1-butyl-3-methylimidazolium hydroxide" to replace traditional inorganic cosolvents such as sodium carbonate and sodium hydroxide to prepare aniline dithiophosphate solution, and can effectively dissolve aniline dithiophosphate between pH 8-9, overcoming the disadvantages of poor solubility of aniline dithiophosphate as a collector and low reagent concentration in the pulp; at the same time, an appropriate amount of 1-butyl-3-methylimidazolium hydroxide is also added as a pulp conditioner during lead flotation, which can not only adjust the pH of the pulp but also accelerate the speed of the collector reaching the target minerals and improve the floating rate of the target minerals. Specific Embodiments

[0016] A combined reagent for improving the recovery rate of associated gold in lead-zinc ore, which is composed of the ionic liquid 1-butyl-3-methylimidazolium hydroxide, aniline dithiophosphate, and 25 # dithiophosphate.

[0017] This combined reagent is used for the rough lead selection operation in the preferential flotation process of lead and zinc in lead-zinc ore, and the main purpose is to improve the recovery rate of associated gold in lead concentrate. Among them: aniline dithiophosphate and 25 # dithiophosphate are lead flotation collectors, and 60 - 90 g is added per 1 t of pulp. 1-butyl-3-methylimidazole hydroxide is a pulp conditioner, and 30 - 50 g is added per 1 t of pulp. And 25 # dithiophosphate in the form of an oily liquid is added as the original solution, and aniline dithiophosphate and 1-butyl-3-methylimidazole hydroxide are formulated into an aniline dithiophosphate solution with a mass concentration of 1 - 2% and then added. The mass ratio (g / g) of aniline dithiophosphate to 25 # dithiophosphate is 1 / 2 - 1 / 4.

[0018] The aniline dithiophosphate solution with a mass concentration of 1 - 2% means that 1-butyl-3-methylimidazole hydroxide is dissolved in water, the pH of the aqueous solution is adjusted to 8 - 9, and this aqueous solution is used as the solvent, and aniline dithiophosphate is used as the solute, and they are mixed evenly to prepare.

[0019] During application, the addition sequence of this combined reagent is to first add 1-butyl-3-methylimidazole, stir and react for 3 - 5 minutes, and then simultaneously add the aniline dithiophosphate solution with a mass concentration of 1 - 2% and 25 # dithiophosphate original solution.

[0020] In the present invention, 1-butyl-3-methylimidazole hydroxide not only promotes the dissolution of aniline dithiophosphate as a solvent component of the aniline dithiophosphate solution, but also is added as a pulp conditioner during flotation.

[0021] Example 1

[0022] In a certain lead-zinc ore, the main recoverable elements are lead, zinc, and sulfur, and there are associated gold and silver minerals. The lead grade is 2.5%, and the gold grade is 0.35 g / t.

[0023] Take 1000 g of representative samples for grinding, control the grinding fineness to 60% - 200 mesh, adjust the pulp to a concentration of 33%, then add 30 g / t of 1-butyl-3-methylimidazole hydroxide, stir and react for 3 minutes, and then simultaneously add 20 g / t of an aniline dithiophosphate solution with a concentration of 1% (the dosage of the reagent is calculated based on the fixed mass of aniline dithiophosphate) and 25 # 60 g / t of dithiophosphate original solution, stir and react for 3 minutes, and then conduct rough selection of lead minerals to obtain 64.3 g of rough lead selection concentrate. After adjusting the pulp concentration of the rough lead selection concentrate to 12% - 18%, add 200 g of zinc mineral inhibitor "zinc sulfate + sodium sulfite" for cleaning, and obtain 32.9 g of lead concentrate after two cleanings.

[0024] The lead concentrate product obtained under the above process conditions was analyzed by chemical assay. The lead grade was 71.55%, the gold grade was 6.2 g / t, the lead recovery rate was 94.19%, and the gold recovery rate was 56.86%. Under the condition that other process conditions remained unchanged, compared with the conventional single use of 25 # black medicine as a collector, the lead flotation index was equivalent, and the gold recovery rate increased by about 20.22%.

[0025] Example 2

[0026] The main recoverable elements of a lead-zinc ore are lead and zinc, and gold and silver minerals are associated. The lead grade is 1.58% and the gold grade is 0.27 g / t.

[0027] Take 1000 g of representative sample for grinding. Control the grinding fineness to 65%-200 mesh. After adjusting the pulp to a concentration of 33%, add 40 g / t of 1-butyl-3-methylimidazole hydroxide, stir and react for 3 minutes, and then simultaneously add 25 g / t of aniline black medicine solution with a concentration of 1% (the dosage of the reagent is calculated based on the fixed mass of aniline black medicine) and 25 # 50 g / t of black medicine stock solution and stir for 3 minutes, then carry out rough selection of lead minerals to obtain 39.6 g of lead rough concentrate. After adjusting the pulp concentration of the lead rough concentrate to 12% - 15%, add 300 g of zinc mineral inhibitor "zinc sulfate + sodium sulfite" for cleaning. After two times of cleaning, 21.3 g of lead concentrate is obtained.

[0028] The lead concentrate product obtained under the above process conditions was analyzed by chemical assay. The lead grade was 66.30%, the gold grade was 5.5 g / t, the lead recovery rate was 89.46%, and the gold recovery rate was 44.38%. Under the condition that other process conditions remained unchanged, compared with using lime as the pH adjuster and sodium carbonate as the solvent to prepare aniline black medicine solution, the lead flotation index was 1.56% higher, and the gold recovery rate increased by about 11.34%.

[0029] Example 3

[0030] The main recoverable elements of a lead-zinc ore are lead and zinc, and gold minerals are associated. The lead grade is 3.15% and the gold grade is 0.47 g / t.

[0031] Take 1000 g of representative sample for grinding. Control the grinding fineness to 60%-200 mesh. After adjusting the pulp to a concentration of 33%, add 35 g / t of 1-butyl-3-methylimidazole hydroxide, stir and react for 3 minutes, and then simultaneously add 30 g / t of aniline black medicine solution with a concentration of 1% (the preparation method of the solution is shown in claim 3) (the dosage of the reagent is calculated based on the fixed mass of aniline black medicine) and 25 #After stirring and reacting 60 g / t of black medicine stock solution for 3 minutes, rough selection of lead minerals is carried out to obtain 69.6 g of lead rough concentrate. After adjusting the pulp concentration of the lead rough concentrate to 12% - 18%, 400 g of zinc mineral inhibitor "zinc sulfate + sodium sulfite" is added for cleaning. After two rounds of cleaning, 40.7 g of lead concentrate is obtained.

[0032] The lead concentrate product obtained from the closed-circuit test under the above technological conditions is analyzed by assay. The lead grade is 73.47%, the gold grade is 6.4 g / t, the lead recovery rate is 94.83%, and the gold recovery rate is 55.24%. When other technological conditions remain unchanged, compared with the conventional lime pulp adjustment and using only "25 # black medicine + ethyl thionocarbazide" as the collector, the lead flotation index is equivalent, and the gold recovery rate is increased by about 13.35%.

Claims

1. Application of a combined reagent for improving the recovery rate of associated gold in lead-zinc ore, characterized in that: The combined reagent consists of 1-butyl-3-methylimidazolium hydroxide, aniline dithiophosphate, and 25 # dithiophosphate, and it is used for the rough lead flotation operation in the lead-zinc preferential flotation process of lead-zinc ore; among them: aniline dithiophosphate and 25 # dithiophosphate are lead floating collectors, 1-butyl-3-methylimidazolium hydroxide is a pulp conditioner, and 25 # dithiophosphate in the form of an oily liquid is added as the original solution, and aniline dithiophosphate and 1-butyl-3-methylimidazolium hydroxide are formulated into an aniline dithiophosphate solution with a mass concentration of 1-2% and then added.

2. Application of a combined reagent for improving the recovery rate of associated gold in lead-zinc ore as claimed in claim 1, characterized in that: The aniline dixanthogen solution with a mass concentration of 1-2% means that 1-butyl-3-methylimidazolium hydroxide is dissolved in water, the pH of the aqueous solution is adjusted to 8-9, and this aqueous solution is used as the solvent, with aniline dixanthogen as the solute, and they are mixed evenly to obtain it.

3. Application of a combined reagent for improving the recovery rate of associated gold in lead-zinc ore as claimed in claim 1, characterized in that: The pulp conditioner is added at 30-50 g per 1 t of pulp.

4. Use of a combined reagent for improving the recovery rate of associated gold in lead-zinc ore as described in claim 1, characterized in that: The lead flotation collector is added at 60-90 g per 1 t of pulp.

5. Use of a combined reagent for improving the recovery rate of associated gold in lead-zinc ore according to claim 1, characterized in that: The mass ratio of the sodium dibutyl dithiophosphate and the # sodium dibutyl dithiophosphate is 1 / 2 to 1 / 4.

6. Application of a combined reagent for improving the recovery rate of associated gold in lead-zinc ore, characterized in that: The addition sequence of the combined reagent is to first add 1-butyl-3-methylimidazole, stir and react for 3 to 5 minutes, and then simultaneously add an aniline dithiophosphate solution with a mass concentration of 1 to 2% and 25 # dithiophosphate stock solution.