The water content of mineral tailings can be declined under 15%. Compared with the traditional tailing disposal technology, the cost saving is over 2 yuan/t. The working life of tailings dry stacking equipment is twice of traditional equipment, and the maintenance cost is lower. The mine applying tailings dry stacking technology was rated as Green Mine many times.
Using three kinds of patent equipment in dewatering in proper order: Xinhai concentrated type hydrocyclone + high-efficiency deep-cone thickener + high-efficiency high-frequency dewatering screen. The final concentration is over 85%, realizing dry stacking.
Tailings dry stacking technology reduces the equipment investment and construction investment with unique equipment combination. Xinhai patent equipment has a good effect on dewatering, with low energy consumption. The working life is highly extended, and the operation cost is further decreased.
The inner liner of tailings dry stacking technology is Xinhai wear-resistance rubber. The wear resistance index is up to 128%. According to the specific ore characteristics, different characteristics of rubbers are used. It has a wide range of applications. The working life of the whole production line is twice of the common production line. It greatly reduces manual maintenance. The maintenance cost reduces at least 2 yuan/t.
Xinhai tailings dry stacking technology uses three innovative national patent equipments, which provides strong support for tailing concentrating technology:
Xinhai concentrated type hydrocyclone has a siphon device on the upside. The downside has a fishtail device (The siphon and fishtail device both required the national patent). Through adjusting the siphon device, the downflow concentration can be adjusted, commonly about 75%. It largely reduces the investment of follow-up equipment in tailings dry stacking technology.
High-efficiency deep-cone thickener and multi-cone thickener install tilted plates in it, which increases the settlement area of thickener. The settlement area increases more than eight times, improving downflow concentration and capacity.
High-frequency high-efficiency dewatering screen has a unique sieve plate structure. Adding multi-frequency vibration of the motor, the mineral particles are not easy pass the sieve pore, and the dewatering efficiency is higher.
The capacity is 4000t/d. The granularity is 65% -200 mesh. The concentration is 30%, and the pH is neutral.
Main equipment | Number of equipment | Total power (kw) | Vulnerable parts and life | Products moisture (%) | Cost of production (yuan/t) |
Belt filter press | One Φ45-53m thickener | 700kw | Filter cloth | 14-18 | 6-8 |
Chamber filter press | One Φ45-53m thickener | 350kw | Filter cloth | 16-20 | 5-8 |
Ceramic filter | One Φ45-53m thickener | 600kw | Ceramic plate | 8-12 | 5-8 |
High-frequency dewatering screen | 2 Φ15m multi-cone thickeners | 220kw | Screen cloth | 15-20 | 2-4 |
A gold dressing plant in Inner Mongolia has a history of nearly 40 years. It is a typical old dressing plant. Before the new tailings pond was built in 2002, the old tailings pond had stored up to about 900,000 tons of high gold content. The recoverable tailings are about 1665kg gold and 25t silver. Xinhai uses the original 250t/d carbon pulp plant for the industrial practice of tailings treatment, and adopts the gold extraction process of all-slime cyanidation carbon pulp to extract gold and silver from the gold tailings. In order to further improve the index, the vacuum pump is replaced by a negative oxygen machine, and the process of immersion and absorption is adopted. The gold-loaded carbon produced is sent to desorption and electrolysis to produce finished gold. The main indicators are as follows: raw leaching grade: gold 2.83g/t, silver 39g/t, the gold leaching rate is 86.5%, the silver leaching rate is 48%, the total recovery rate of gold dressing and metallurgy is 80.4%, and the total recovery rate of silver dressing and metallurgy is 80.4%. It is 38.2%, fully excavating the value of tailings and increasing the benefit for the dressing plant.
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