CN110616324A

CN110616324A - Method for extracting silver from silver-containing lead-zinc tailings and utilizing waste residues of silver

Info

Publication number: CN110616324A
Application number: CN201910287581.4A
Authority: CN
Inventors: 范鹏
Original assignee: Suzhou Chongyushan New Material Technology Co Ltd
Current assignee: Suzhou Chongyushan New Material Technology Co Ltd
Priority date: 2019-04-11
Filing date: 2019-04-11
Publication date: 2019-12-27

Abstract

The invention belongs to the technical field of new materials and environmental protection. The invention relates to a process method for extracting silver from lead-zinc cyanide tailing powder containing a small amount of silver by using a technology, reducing the silver in the tailing powder, and using the residual lead-zinc tailing powder to replace part of cement for preparing a concrete prefabricated part, wherein the process method comprises the following steps: (1) lead-zinc ore has a wrapping effect on silver in ore powder in cyaniding extraction, the content of the lead-zinc ore tailings is quite high, and the risk of the application of the lead-zinc ore tailings and a concrete prefabricated member is high; therefore, the cyanidation tailing slag needs to be pretreated and ground into 200 meshes; (2) performing wet leaching on cyanided tailing powder, and releasing silver from the 'package' by using a process of catalyzing acidolysis iron leaching to realize cyaniding leaching; (3) drying the lead-zinc cyanide tailing powder after silver reduction for 5 hours to 3 days; (4) and (3) mixing the dry powder with cement, and combining the sandstone aggregate to manufacture a concrete prefabricated member.

Description

Method for extracting silver from silver-containing lead-zinc tailings and utilizing waste residues of silver

Technical Field

The invention belongs to the technical fields of new material technology and environmental protection and energy conservation, and relates to a technology for producing a concrete prefabricated part by recycling tailings and precious metals and replacing partial cement with tailings.

Background

With the rapid development of urban construction and the rapid increase of population, the speed of urbanization and industrialization is accelerated, mineral consumption and mining are increased year by year, and the tailing powder is accumulated more and more. Are becoming more and more complex. According to incomplete statistics, 9000 large and medium-sized mines in China have more seats, 26 thousands of small-sized mines have corresponding tailings occupying more than 1 ten thousand square kilometers. The long-time tailing accumulation can not only pollute water, land and air, but also cause serious geological disasters, and the debris flow and dam break 200 caused by the tailing accumulation and a tailing reservoir are more in China since 80 years of the 20 th century. Taking lead-zinc tailing powder as an example, the tailings invade the land, heavy metals and rare metals can damage vegetation and cause pollution to the land and underground water, and meanwhile, secondary dust and dust pollution, water body pollution and the like are generated due to severe weathering. The tailings contain heavy metal ions, and toxic residual flotation reagents even bring disasters which are difficult to compensate for to people. The method for refining metal by cyanidation is mainly used in China, and cyanidation tailings are a large amount of dangerous solid wastes in China, contain a large amount of cyanides, and have far-reaching harm to the environment by residual medicaments.

The tailings powder also becomes mine solid waste, has double properties of harm and utilization, and is also a precious secondary resource. The lead-zinc tailings can be used for replacing part of cement to be applied to concrete prefabricated parts after being treated by a proper technology, and medium and trace heavy metals and cyanides in the tailings powder can be sealed in the lead-zinc tailings, so that the phenomena of secondary air pollution, land and water body pollution and the like of the tailings can be avoided.

The tailings powder disclosed by the invention contains metal elements such as lead, zinc, silver and the like in tailings, wherein the recovery value of silver is high, and the lead-zinc tailings powder after silver extraction is more suitable for replacing part of cement to be applied to the production technology of concrete members.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a method which can reduce the serious burden on the environment and the treatment cost caused by the fact that lead-zinc tailings are not utilized while ensuring the product performance, refine and reduce silver in the lead-zinc tailings, and replace part of cement with the lead-zinc tailings after the silver is extracted to be applied to the production of concrete members.

The purpose of the invention can be realized by the following technical scheme: a production and process method for concrete members by using tailings containing silver, lead and zinc to extract silver comprises the following steps:

(1) extracting silver from lead-zinc tailing powder

And (3) carrying out grinding pretreatment on the silver-containing lead-zinc tailing slag, and reducing the silver of the tailing powder by using a cyanidation leaching method.

(2) Drying the lead-zinc cyanide tailing powder for preparing the concrete prefabricated member

Drying the lead-zinc cyanide tailing powder after silver reduction for 5 hours to 3 days (2), and replacing part of cement with the lead-zinc cyanide tailing powder after silver removal to be applied to the production of concrete prefabricated parts.

The metal balance of the lead-zinc tailings is as follows: 0.02 g ton of copper, 0.15 g ton of lead, 0.14 g ton of zinc, 3 g ton of sulfur and 35 g ton of silver.

Reference is made to GB1346-2011 cement standard consistency water consumption, setting time and stability test method, JGJ52-2006 common concrete sand and stone quality and test method standard, GBT 12957-. The compressive strength of the cement mortar is adopted to evaluate the activity index, and the tailings replace the cement by 30 percent. The method has good economic and social benefits while reducing the serious burden of solid wastes on the environment and the treatment cost.

Detailed Description

The present invention will be described in detail with reference to specific examples. The main metal contents comprise copper, lead 0.15 g ton, zinc 0.14 g ton, sulfur and silver

Step 1:

the metal content of the raw materials is shown in table 1.

Table 1 metal content of the raw material, units: gram ton

Copper (Cu)	0.02
		Lead (II)	0.15
Zinc	0.14
		Sulfur	3
Silver (Ag)	35

The lead-zinc cyanide tailings have high silver content and can be extracted and recovered. Grinding the lead-zinc cyanide tailing ore to 200 meshes.

Step 2, recovering/extracting silver in cyanide tailings by using wet leaching method

Using wet leaching, unequal amounts of Ag (CN) -containing material in the form of cyanidation tailings₂With Ag⁺. CN-at this time, the amount of silver salt such as silver nitrate added is calculated from the results of the analysis by the Moore method. Adding silver salt such as silver nitrate to make it into Ag⁺+Ag(CN)-₂＝Ag(Ag(CN₂) ) and precipitated.

And 3, after silver is filtered out, drying the tailings powder participating in lead and zinc for 5 hours to 3 days according to the weather temperature and humidity.

Step 4, adding 15% of S95 grade ore powder by weight of the dried lead-zinc tailing powder; or adding 10% of S105 grade mineral powder; or adding 20% of S75 grade mineral powder; or the S75, S95 and S105 are added according to the ratio of 2: 1.5: 1 percent of the mixture is added with 15 percent of the mixture, and a plurality of components are uniformly mixed and stirred to replace 30 percent of the cement dosage to be applied to the preparation of the concrete prefabricated member.

The above formulations were tested for reference properties and the results are shown in table 2.

TABLE 2 test results of applying lead-zinc tailings powder with improved performance to preparation of concrete prefabricated parts

Claims

1. A utilization method for extracting silver and waste residues thereof by utilizing tailings containing silver, lead and zinc is characterized by comprising the following steps:

(1) grinding silver-containing lead-zinc cyanide tailing slag

Pretreating silver-containing lead-zinc tailing slag, and grinding the silver-containing lead-zinc tailing slag into 200-mesh lead-zinc cyanide tailing powder

(2) Reduction of silver from tailings fines using wet leaching

And (3) carrying out wet leaching on the cyanidation tailing powder to release silver from the 'package' so as to realize cyanidation leaching.

(3) Drying lead-zinc tailing powder

Drying the lead-zinc cyanide tailing powder after silver reduction for 5 hours to 3 days;

(4) applied to preparing concrete prefabricated member

And (3) mixing the dry powder with cement, and combining the sandstone aggregate to manufacture a concrete prefabricated member.

2. The process of claim 1, wherein the lead-zinc tailings are prepared by extracting silver from the lead-zinc tailings, wherein the balance of metals in the lead-zinc tailings is as follows: 0.02 g ton of copper, 0.15 g ton of lead, 0.14 g ton of zinc, 3 g ton of sulfur and 35 g ton of silver.

3. The process method for extracting silver from silver-containing lead-zinc tailings and using the extracted silver in the prefabricated member according to claim 1, wherein the leaching rate of the silver in the iron leaching slag is 60-70%. And grinding the lead-zinc cyanide tailing powder to 200 meshes, and drying.

4. The process method for extracting silver from lead-zinc tailings containing silver and then using the extracted silver in the prefabricated member according to claim 1, which is characterized by referring to GB1346-2011 cement standard consistency water consumption, setting time, stability test method, JGJ52-2006 common concrete sand and stone quality and test method standard, and GBT 12957-2005 industrial waste residue activity test method for cement admixture. The compressive strength of the cement mortar is adopted to evaluate the activity index, and the tailings replace the cement by 30 percent.