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tailings dry stacking

Tailings Dry Stacking Process


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.


Xinhai tailings dry stacking technology is mainly applied to the dewatering and concentrating of mineral tailings in the mineral processing plants. To reach the aim of tailings dry stacking and avoiding environmental pollution, it is the essential technology of green mine.

【Process Description】

Good tailing dewatering effect

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.

Low technology operation cost

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.

Long working life

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.

Patent equipment

Xinhai tailings dry stacking technology uses three innovative national patent equipment, which provides strong support for tailing concentrating technology:

Xinhai concentrated type hydrocyclone has s 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.

Comparing the main equipment indexes of 4000tpd tailings dry stacking project

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
4-5 90m2 belt filter press
4-5 vacuum pumps
10 slurry pumps


Filter cloth
3-5 months



Chamber filter press

One Φ45-53m thickener
8 106m2 chamber filter press
16 slurry pumps


Filter cloth
2-3 months



Ceramic filter

One Φ45-53m thickener
10 Ceramic filter
10 vacuum pumps


Ceramic plate
2-6 months



High-frequency dewatering screen

2 Φ15m multi-cone thickeners
5 slurry pumps
2 hydrocyclones
4 GVD1536 high-frequency dewatering screens


Screen cloth
8 months




Since Xinhai first put forward the tailings dry stacking technology, Xinhai has near 100 actual construction examples, with outstanding results. Such as the Shandong feldspar tailing project, through tailing dry stacking, the tailings fill in the goaf, realizing zero-emission. This mine won the Green mine honorary title in 2010.

Representative case: Henan gold all-slime cyanidation plant

Xinhai tailings dry stacking technology almost satisfies the dewatering requirement of all kinds of ores. Some difficult tailings are no exception. In Henan gold all-slime cyanidation plant, the tailing mud is serious. The tailing amount is 500tpd, and the concentration 43%. It is not easy to sediment, belonging to hard-to-dehydrate tailings. Originally, the tailings are wetly discharged after bleaching powder treatment. The annual bleaching powder cost is up to 1650 thousand. The bleaching powder incomplete processing would harm the environment.

Since the policy of the environment, this mine is in sore need of tailings dry stacking treatment to reduce environmental pollution. Yet, the principal consulted multiple enterprises and found that the technology level can’t reach the requirement, or cost too much. The budget of some manufacturers is even up to twice their budget. Later one day, the principal learned Xinhai from his friend. He visited the factory and checked the effect of the Xinhai tailings dry stacking site. So he trusted Xinhai for this tailing dry stacking reconstruction project.

After the detailed analysis of the actual tailing indexes, Xinhai adjusted the tailings dry stacking technology and equipment to location conditions. Two-stage hydrocyclone is used for concentration and classification. The downflow is dewatering by Xinhai high-frequency dewatering screen. The overflow flows into the original thickener. Through the treatment, the final production rate of the on-screen product is about 60%. The water content is less than 15%. The comprehensive return rate is 75% at present. 0.62m3 of backwater per ton of ores fully meets the requirements of dry tailings discharge. The cost per ton of ores is the only 1.7yuan. The saveable bleach costs are only 1650 thousand. The comprehensive efficiency is up to 3000 thousand per year, which is completely over the expectations of the partner.

Through this cooperation, both sides witnessed the strength of Xinhai. The principal also expressed that, if there would be new projects and new equipment, Xinhai would be the priority selection. It is this good image of “success, influencing one side, and driving the overall situation” for Xinhai Company to win a broader market and create more and more opportunities.

Other representative cases:

Xinhai has lots of tailing dry stacking cases. Welcome to visit our company, and we will introduce you to another similar production line. The facts tell everything!

A Laizhou smelter has -400 mesh 85% roasting cyanide tailings. Through the tailings dry stacking process, the water content of the on-screen product is between 13%-14%, which reached the dry stacking requirement.

Inner Mongolia rare earth mine products 1800 tons per day. After applying for Xinhai tailings dry stacking technology, the reduced industrial wastewater is 738 thousand m3/year. The water content of tailing is 14%-16%, which reached the design target.

Hainan iron mine processes tailings 1000 tons per day. The tailing fineness is over 85% -325 mesh. Through the dewatering treatment of tailings dry stacking technology, the water content of tailings is 15%-17%, reaching the predicted aim.

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