Mine water undergoes a series of physical, chemical, and biological reactions that occur during the mining process of coal, where groundwater comes into contact with coal seams and rock layers, combined with the influence of human activities. Therefore, the water quality has significant characteristics of the coal industry.

The current goal of mine water treatment technology is to reduce or even eliminate drugs, shorten the process, and save space.

These two goals all point to the technology of using ceramic membrane products for pre-treatment of mine water.

Silicon carbide flat sheet membrane is made by sintering high-purity silicon carbide powder at high temperature, and is currently the membrane material with the best hydrophilicity and anti pollution ability.

Silicon carbide flat sheet membrane and case introduction

·  The membrane surface with high negative charge can ensure excellent pollution resistance across a wide pH range；

·  Ideal operating conditions - when the pH of PAC addition is less than 6, the membrane surface can maintain a negative charge of -25~-30 millivolts, making it difficult for soluble organic carbon and transparent outer polymer particles to adhere to the membrane surface；

·  It is easy to clean negatively charged substances from the membrane surface in water, such as bacteria, algae, MLSS, transparent outer polymer particles, and oil substances.

Specific cases

1500 tons/day positive pressure plate membrane&RO system

Silicon carbide columnar membrane and case introduction

This product is an innovative product that breaks the boundary between the application scenarios of inorganic and organic membranes. It combines the advantages of ceramic membrane products being sturdy and durable, as well as high filling density of organic membrane products. The usage method is similar to the height of organic membrane column membranes, which compensates for the high requirements for inlet water quality, high backwash water consumption, and the risk of wire breakage in ultrafiltration membrane technology. It can improve the water yield of ultrafiltration systems and reduce chemical cleaning costs.

The silicon carbide cylindrical ceramic membrane is composed of multiple built-in silicon carbide ceramic filter cartridges spliced together. The unique structural design makes the hydraulic distribution of the water production and backwashing channels of each tubular membrane more uniform, and the backwashing recovery effect is outstanding.

Specific cases

500 tons/hour mine water silicon carbide ceramic core column membrane system

At present, for the purification of tap water, we use the third-generation short process silicon carbide ultrafiltration pretreatment+hollow fiber membrane filtration technology.

The silicon carbide ceramic flat plate ultrafiltration system can integrate the sand filter, ozone contact oxidation tank, and ultrafiltration system into one, greatly saving land area and shortening the process flow. It has a more flexible process design, such as a dynamic dual effect filtration process combined with powder activated carbon.

Case One

28800 tons/day salmon aquaculture water pretreatment project

Process route: seawater → baffled reaction tank (two-stage reaction, sodium hypochlorite and flocculant) → silicon carbide flat plate ultrafiltration system → seawater desalination reverse osmosis, stable operating flux of 220LMH.

Case 2

5000 tons/day drinking water project

Process route: flocculation sedimentation tank → silicon carbide ceramic core column membrane → disinfection → production water tank.

Case Three

50 tons/day Dancun Water Plant Project

Process route: flocculation sedimentation tank → silicon carbide ceramic core column membrane → disinfection → production water tank.

Membrane Coagulation Reactor (MCR) is a technology that combines chemical treatment processes with membrane separation processes, mainly used for removing suspended solids, heavy metals, hardness, turbidity, and silicon. Membrane chemical reactors can even be combined with processes such as membrane concentration and evaporation crystallization to achieve reduction and near zero discharge of concentrated brine, providing a new technological route and solution for the resource utilization and reuse of concentrated brine.

Case One

Softening by flat sheet membrane

Project scale 2 x 50 tons/day · set

Design flux 260LMH

Case 2

Replace the alumina ceramic membrane

Chlorine alkali chemical brine refining

Project scale and processing capacity of 240m³/ h · set

915 pieces φ 31-3.8-19-1200

Design flux 1000LMH

In the membrane separation industry, materials have always driven the iteration of membrane separation products and the development of their application technologies.

Silicon carbide is a recognized next-generation ceramic membrane separation material in the industry, with significant performance advantages such as high throughput, corrosion resistance, easy cleaning, and long service life.

Especially in the field of acidic liquid purification, the advantages of our silicon carbide ceramic membrane are undoubtedly evident.

Case One

Jiangsu company 5m³/ h Solid liquid separation project for mixed acid solution containing 10wt% nitric acid 

Case Two

10m³/h solid-liquid separation project for a company in Yunnan containing 15wt% hydrofluoric acid solution

Case Three

A certain group's 10m³/h oil-water separation project containing 30wt% hydrochloric acid solution

Case Four

A certain enterprise in Shaoxing’s 5m³/h pH less than 2 material concentration project

In the processing of metals, glass, and plastics, various processing fluids are indispensable, such as cutting fluids that provide lubrication and cooling, and cleaning fluids that provide cleaning effects.

There are two options for users to dispose of liquid hazardous waste:

1、Outsourced disposal reduction；

2、Reuse after purification and regeneration。

Outsourced disposal reduction essentially involves concentrating and dehydrating liquid hazardous waste.

After purification and regeneration, reuse essentially extends the service life of the processing fluid, thereby reducing the amount of liquid hazardous waste generated per unit cycle.

The reduction in outsourced disposal will save on disposal costs; After purification and regeneration, reuse saves the amount of fresh processing fluid used plus disposal costs.

For outsourcing disposal reduction, it is recommended to use low-temperature evaporation process equipment.

Case One 

Regeneration capacity 10 × 10 tons/day · set

We conducted a three-month pilot test at the site of Party A, and the degreasing solution can meet the standards for reuse after being filtered by a silicon carbide membrane.

Rinsing also requires pre-treatment through electrocoagulation process, followed by filtration through silicon carbide membrane to meet the standard for reuse.

Case 2

Regeneration capacity 4 × 100 tons/day · set

A domestic listed company uses a combination process of centrifuge and silicon carbide ceramic membrane to recycle and regenerate glass grinding fluid when producing mobile phone glass screens.

The original liquid is turbid, and the filtered out liquid is transparent

The core purpose of the resource utilization and regeneration of liquid hazardous waste is to effectively remove impurities (particles, oils, bacteria, etc.) brought in by fresh processing fluid during use, while maximizing the retention of the effective components of the fresh processing fluid. Of course, the active ingredients of fresh processing fluid will also be lost during use. Regenerated processing fluid can recover its performance by adding a certain proportion of fresh processing fluid.

For the removal of extremely fine particles, centrifuges have limits (generally ≥ 0.5um). Ceramic membranes can compensate for the shortcomings of centrifuges in terms of filtration accuracy.

Oil contamination is a recognized pain point in membrane separation products. But it is precisely the itching point of the silicon carbide membrane. Setting aside cross flow filtration technology, oil resistance, easy cleaning, and ideal and stable operating flux are the core values of silicon carbide membrane products.

The durability of silicon carbide membrane, combined with the brief process flow of electrocoagulation or centrifuge, can create huge value for users.

The recycling of various types of liquid hazardous waste resources, such as cleaning and rinsing liquids for metal products, processing liquids for optical and electronic glass, and grinding liquids for metal products, is a very advantageous application scenario for silicon carbide membranes.

Transformation of 240m³/h primary brine refining organic membrane system to silicon carbide membrane system

The application of silicon carbide membrane in a brine plant of a chlor alkali enterprise in Ningbo. Due to the original Kai membrane equipment reaching its service life and high maintenance costs, as well as limited land use, a new 240m3/h silicon carbide membrane equipment was installed in the first phase of brine refining renovation in July 2021. The investment, land occupation, and operating costs were reduced by half compared to traditional ceramic membrane processes. After three months of use, the water production was stable and the brine index was excellent, In February 2023, three new silicon carbide membrane devices were installed in the second phase.

● Equipment parameters

● Actual operational data