阅读说明：本技术 一种用于从硫代硫酸盐浸金液中回收金的吸附剂的制备方法 (Preparation method of adsorbent for recovering gold from thiosulfate gold leaching solution ) 是由 胡显智 李鑫容 字富庭 林玥 陈云龙 于 2021-09-07 设计创作，主要内容包括：本发明公开一种用于从硫代硫酸盐浸金液中回收金的吸附剂的制备方法,属于贵金属回收领域。本发明旨在为硫代硫酸盐浸金液中金的难回收及成本高等问题提供一种可行的方法；所述方法以乙醇为溶剂,三苯基氧膦为改性剂,在一定条件下对天然蛭石进行改性；将改性蛭石应用于硫代硫酸盐浸金液中回收金,其对浸液中金的吸附效果可达3.9kg/t,本发明具有工艺简单、改性时间短、耗能低、成本低及稳定性好等优点,可应用于贵金属及污水中重金属离子回收领域。(The invention discloses a preparation method of an adsorbent for recovering gold from thiosulfate gold leaching solution, belonging to the field of precious metal recovery. The invention aims to provide a feasible method for solving the problems of difficult recovery, high cost and the like of gold in thiosulfate gold leaching solution; the method takes ethanol as a solvent and triphenylphosphine oxide as a modifier to modify natural vermiculite under certain conditions; the modified vermiculite is applied to thiosulfate gold leaching solution to recover gold, and the adsorption effect of the modified vermiculite on gold in the leaching solution can reach 3.9 kg/t.)

1. A preparation method of an adsorbent for recovering gold from thiosulfate gold leaching solution is characterized by comprising the following steps:

(1) washing natural vermiculite with deionized water, removing ash, filtering, and drying;

(2) putting the vermiculite obtained in the step (1) into a modified solution according to the solid-liquid ratio of 1:10-40, and soaking for a period of time; the modified solution is an ethanol solution of triphenylphosphine oxide and derivatives thereof;

(3) and (3) cleaning the vermiculite obtained in the step (2) with ethanol or water, and filtering and drying to obtain the adsorbent for recovering gold from the thiosulfate gold leaching solution.

2. The method of claim 1 for producing an adsorbent for recovering gold from a thiosulfate gold-leaching solution, characterized in that: the concentration of the triphenylphosphine oxide and the derivative thereof in the step (2) is 0.05-0.2 g/mL.

3. The method of claim 1 for producing an adsorbent for recovering gold from a thiosulfate gold-leaching solution, characterized in that: in the step (2), the dipping condition is 10-120 ℃ for 1-12 h.

4. The method of claim 1 for producing an adsorbent for recovering gold from a thiosulfate gold-leaching solution, characterized in that: and (3) replacing ethanol in the step (2) by methanol or propanol.

Technical Field

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a preparation method of an adsorbent for recovering gold from thiosulfate gold leaching solution.

Background

Gold is a national-level reserve resource, but the gold yield is reduced year by year due to the influence of policies such as domestic successive release of environmental taxes, cyanide slag as hazardous waste management and the like. This is mainly due to the very toxic nature of cyanide, and the accumulation of large amounts of cyanidation waste has severely contaminated the environment. In order to avoid the use of extremely toxic cyanide and the pollution of cyanide slag, the cyanidation method is strictly controlled in many countries, and even some countries forbid the use of the method.

The thiosulfate gold leaching method has the characteristics of no toxicity, environmental protection, energy conservation, high efficiency and the like, and becomes a non-cyanide gold extraction technology which most possibly replaces a cyanidation method. However, when the carbon slurry method in the cyanidation method is applied to a thiosulfate gold leaching system, the gold recovery effect of the activated carbon is almost zero. Although the patent (CN 104549147A) has achieved a certain effect by performing deposition modification on activated carbon, the modification process is complex and the cost is too high; patent (CN 111889068A) uses sulfydryl substances to perform surface modification on activated carbon, but cannot be widely used due to the instability of sulfydryl. It is evident that activated carbon has been difficult to adapt for gold recovery in thiosulfate gold leaching systems.

Vermiculite is a natural, inorganic and nontoxic mineral substance, belongs to phyllosilicate, has a large specific surface area, and is often used as an adsorption material; the adsorption capacity of vermiculite mainly comes from its own cation exchange and adsorption, but its ion exchange capacity is weak, the adsorption is not strong, has limited its large-scale application; although vermiculite has the characteristics of large specific surface area, developed pores and the like, vermiculite has no adsorption effect on gold in thiosulfate gold leaching solution.

Disclosure of Invention

The invention aims to provide a preparation method of an adsorbent for recovering gold from thiosulfate gold leaching solution, which uses triphenylphosphine oxide to modify vermiculite surface functional groups, and has simple whole modification process and easy operation; the prepared modified vermiculite has large metal ion loading capacity, has wide prospect in the field, and specifically comprises the following steps:

(1) washing natural vermiculite with deionized water, removing ash, filtering, and oven drying.

(2) Putting the vermiculite obtained in the step (1) into a modified solution according to the solid-liquid ratio of 1:10-40, and soaking for a period of time; the modified solution is an ethanol solution of triphenylphosphine oxide and derivatives thereof.

(3) And (3) cleaning the vermiculite obtained in the step (2) with ethanol or water, and filtering and drying to obtain the adsorbent for recovering gold from the thiosulfate gold leaching solution.

Preferably, the concentration of triphenylphosphine oxide and its derivatives in step (2) of the present invention is 0.05-0.2 g/mL.

Preferably, the impregnation in step (2) of the present invention is carried out at 10 to 120 ℃ for 1 to 12 hours.

Preferably, in step (2) of the present invention, ethanol is replaced by methanol or propanol.

The invention has the beneficial effects that:

(1) the invention carries out surface modification on vermiculite by triphenylphosphine oxide and derivatives thereof, and aims to change the surface property, enhance the affinity to metal ions and improve the adsorption capacity to gold in thiosulfate gold leaching solution.

(2) The modified vermiculite prepared by the method is stable in property, and the adsorption capacity of the modified vermiculite cannot be changed after the modified vermiculite is placed for a long time.

(3) The modified vermiculite prepared by the invention is suitable for the adsorption solution, has a wide pH range, and has a good adsorption effect within the pH range of more than or equal to 6.

(4) The invention has simple process, easy production, good adsorption effect and cheap and easily obtained raw materials.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments, but the present invention is not limited thereto

Not limited to the contents.

Example 1

A preparation method of an adsorbent for recovering gold from thiosulfate gold leaching solution specifically comprises the following steps:

(1) washing 2g of natural vermiculite with deionized water, removing ash, filtering and drying for later use.

(2) Putting the vermiculite obtained in the step (1) into a modified solution of 0.05g/mL according to a solid-to-liquid ratio of 1:10(g: mL), and soaking at 10 ℃ for 12 hours; the modified solution is a mixed solution of triphenylphosphine oxide and ethanol according to the volume ratio of 1: 20.

(3) And (3) washing the vermiculite obtained in the step (2) with ethanol/water for three times, filtering, and drying at 80 ℃ for 12 hours to obtain the modified vermiculite.

(4) 1g of the modified vermiculite obtained in step (3) was placed in 100mL of Au (S) at a concentration of 50mg/L at pH 6₂O₃)₂ ^3-Adsorbing the leachate for 6h, and filtering; the adsorption rate was found to be 74% and the loading was found to be 3.7 kg/t.

Example 2

A preparation method and application of triphenylphosphine oxide modified vermiculite comprise the following steps:

(1) washing 2g of natural vermiculite with deionized water, removing ash, filtering and drying for later use.

(2) Putting the vermiculite obtained in the step (1) into a modified solution of 0.1g/mL according to a solid-to-liquid ratio of 1:20 (g: mL), and soaking at 80 ℃ for 6 hours; the modified solution is a mixed solution of triphenylphosphine oxide and ethanol according to the volume ratio of 1: 10.

(3) And (3) washing the vermiculite obtained in the step (2) with ethanol/water for three times, filtering, and drying at 50 ℃ for 24 hours to obtain the modified vermiculite.

(4) 1g of the modified vermiculite obtained in step (3) was placed in 100mL of Au (S) at a concentration of 50mg/L at pH 8₂O₃)₂ ^3-Adsorbing the leachate for 6h, and filtering; the adsorption rate was found to be 79% and the loading was found to be 3.9 kg/t.

Example 3

A preparation method and application of triphenylphosphine oxide modified vermiculite comprise the following steps:

(1) washing 2g of natural vermiculite with deionized water, removing ash, filtering and drying for later use.

(2) Putting the vermiculite obtained in the step (1) into a modified solution of 0.2g/mL according to a solid-to-liquid ratio of 1:40 (g: mL), and soaking at 120 ℃ for 1 h; the modified solution is a mixed solution of triphenylphosphine oxide and ethanol according to the volume ratio of 1: 5.

(3) And (3) washing the vermiculite obtained in the step (2) with ethanol/water for three times, filtering, and drying at 100 ℃ for 8 hours to obtain the modified vermiculite.

(4) 1g of the modified vermiculite obtained in step (3) was placed in 100mL of Au (S) at a concentration of 50mg/L at pH 9₂O₃)₂ ^3-Adsorbing the leachate for 8 hours and then filtering; the adsorption rate was found to be 69% with a loading of 3.45 kg/t.

Example 4

A preparation method and application of triphenylphosphine oxide modified vermiculite comprise the following steps:

(1) washing 2g of natural vermiculite with deionized water, removing ash, filtering and drying for later use.

(2) Putting the vermiculite obtained in the step (1) into a modified solution of 0.2g/mL according to a solid-to-liquid ratio of 1:40 (g: mL), and soaking for 3h at 120 ℃; the modified solution is a mixed solution of triphenylphosphine oxide and ethanol according to the volume ratio of 1: 5.

(3) And (3) washing the vermiculite obtained in the step (2) with ethanol/water for three times, filtering, and drying at 90 ℃ for 8 hours to obtain the modified vermiculite.

(4) 1g of the modified vermiculite obtained in step (3) was placed in 100mL of Au (S) at a concentration of 50mg/L at pH 11₂O₃)₂ ^3-Adsorbing the leachate for 8 hours and then filtering; it was found that the adsorption rate was 76% and the loading was 3.8 kg/t.

While the present invention has been described in detail with reference to the specific embodiments thereof, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.