Why is Coal Preparation Need

Raw coal is mixed with various mineral impurities in the process of formation, and inevitably mixed with rocks and other impurities in the roof and floor in the process of mining and transportation. So the raw coal must be prepared, the main purpose of coal preparation can be summarized as follows:

• (1) Remove impurities in run-of-mine coal, reduce ash and sulfur, improve coal quality and meet the needs of users;
• (2) Divide coal into different quality and specifications to meet the needs of users, so as to make effective and rational use of coal and save cost;
• (3) After coal washing, gangue can be discarded on the spot, which can reduce invalid transportation and create conditions for comprehensive utilization of gangue;
• (4) Coal washing can remove most of the ash and 50% – 70% pyrite sulfur, and reduce the air pollution caused by coal combustion. It is the premise of clean coal technology.

Why Choose LZZG Sand Washing Machine

LZZG sand washing machine is a multi-functional sand washer combining a wheel sand washing machine and a fine sand recovery system.

We used a reliable structure to connect 2 different units, occupying a smaller area than the 2 Independent devices alone, and the structure design is stable and durable. In terms of function, ordinary sand washing machines on the market generally only have the function of sand washing, but LZZG Sand Washing Machines integrate three functions of sand washing, dewatering and recycling, make it available for supreme sand quality and maximise recovery of fine sand.

How Sand Washing Machine Work

The gravel mixture enters the cleaning box from the feeding , and the impeller starts to rotate by the motor and the reducer, so that the materials are fully frictioned to remove impurities and destroy the water vapor layer on the surface of the material for subsequent dehydration and recovery.The washed material enters the lower dewatering device and removes a large amount of water through the high-speed vibration of the dewatering screen.

The waste water (containing a lot of fine sand, mud and other impurities) overflowing from the cleaning tank is pumped out by a vacuum high pressure pump, and fine sand is collected by the centrifugal force of the cyclone .Qualified materials will be returned to the dewatering equipment for dehydration treatment, and excess waste water will be discharged into the return water tank.

Design Highlights

1. Just use a wheel sand washer or a screw sand washer, the discharged wastewater always contain a large amount of fine sand, which will cause the product loss.

2. LZZG sand washing machines contain 2 important components: wheel washing unit and fines recovery unit in a single machine, which make the sand specs be more precise.

3. Fine Recovery Unit make the sand and water separated on the dewatering panels, and resulting in a drier product with moisture content as low as 15%.

4. Hydrocyclones equipped on dewatering screen will recovery 0.075mm fines mixed in the slurry and reintroduced back onto the dewatering panels.

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Luoyang Longzhong Heavy Machinery Co., Ltd. is an international enterprise specialized in R & D, production and marketing of mining machinery and industrial milling equipment. Our company develope the production of mining machinery and industrial milling equipment, crusher products are widely used in mining, metallurgy, construction, chemical, power, steel and other industries.

Company based on market demands, always adhere to the development strategy of large research and development, precise production, and excellent service, by virtue of the excellent quality products and efficient service to meet customer needs, so that the Luoyang Longzhong Heavy Machinery thinks globally! We will fully meet your diverse needs, and cast your new brilliant!

Why choose us?

The company has senior design engineers of the mining machinery and industrial milling equipment, domestic and foreign famous universities, degrees, and other technical elites, to provide an inexhaustible driving force for sustainable development of enterprises, and they work together to ensure the long product development, design, production and after-sales service in every aspect of efficient and perfect.

What Is Sludge Thickeneing and Dewatering?

Sludge thickening and dewatering is two important stages in treating sludge. Thickening is the first step of sludge treatment in which the solids concentration is increased and the total sludge volume is correspondingly decreased, Thickening commonly produces sludge solids concentrations between 15% and 20%, LZZG Deep Cone Thickener results in maximum water recovery, maximum underflow density, can help to save the downstream costs.

Dewatring process reduces the most moisture content of the sludge. LZZG use filter press(mechanical dewatering) for dewatering. Separate liquids and solids utilizes the principle of pressure drive, after the mechanical dewatering process, the sludge will results in a 95% reduction in volume, which will be convenient for storage and transportation. Most overflows will be recycled or reusing.

Sludge treatment system is imporatant in treating solid waste. It minimizes the water waste, enabling the re-treatment of sludges so that they can be easily stock or landfill.

LZZG sludge treatment system is consist of Deep Cone Thickener and Filter Press, The systems usually used after sand washing machine, dewatering screen, tailing dewatering screen or sand recycling machines, widely applied for wastewater treatment of sandstone aggregate plant, precious metal dressing plant, ceramics, glass and other industries.

What is lzzg filter press?

As a solid-liquid separation equipment, the filter press has a long history in the application of materials dewatering and liquids solids separation. Specifically, the slurry is pumped into the filter press chambers. Under the action of the pressure pump, the filter plates extrude each other, so the low moisture content cake is formed and released.

LZZG customized filter presses feature good separation effect and wide adaptability, especially for the sticky and fine materials. Whether you require a high capacity of Filter Press or a smaller footprint design, we will design best option standard or specific filter press solutions for each user based on the volume and type of slurry that needs to be dewatered.

As a professional filter press manufacturer, LZZG's extensive range of industrial filter presses, including plate filter press, belt filter press as well as a range of optional equipment accessories: automatic filter cloth cleaning system, auto plate shifting device, auto plate shaking device, automatic hydraulic device, and PLC auto-control, etc.

How many types of aggregates are there?

How to classify aggregates | Types of Aggregates.
Aggregates are variously classified on the foundation of their grain size, their origin, and their volume-weight as follows:

1.Aggregate Types on the foundation of Grain Size.
This is the most common classification, the place in two sorts of aggregates are distinguished: (Fine and Coarse).

(1) Fine Aggregates.
In the Fine Aggregates, the grain-size lies between 4.75 mm and 0.15 mm.

(2) Coarse Aggregates:
Coarse aggregates are those that are retained on the sieve of mesh dimension 4.75 mm.

2.Types on the Basis of origin.
There are three kinds on the Basis of Origin.

(1) Natural:
These include all these types of first-rate and coarse aggregates, that are reachable in nearly prepared to use form, from herbal resources.

(2) Bye-product:
These encompass materials obtained as wastes from some industrial and metallurgical engineering operations, which possess appropriate residences for being used as aggregate.

(3) Processed:
These structure a specific class in Aggregate. They are especially manufactured for use in making Quality Concretes.

3.Types on the Basis of Density.
Three kinds of aggregates are individual on the groundwork of their weight per unit volume.

(1) Standard or Normal:
These kinds of aggregates supply strength and weighting to the Concrete of around two 2300 to 2500 kg/m3.

(2) High-Density Aggregates:
These are that kind of Aggregates, which is used in fashionable proportions yield in heavy weight concretes.

(3) Light weight Aggregate:
They consist of herbal and artificial materials of very low density so that the resulting concrete is also pretty Light in weight, usually with in a vary of 350 to 750 kg/m3.

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Wastewater Treatment Belt Press

LZZG Belt filter presses are designed for dewatering applications where sludge is particulate, include various types of industrial wastewater sludge, such as sand-making mud, washed sand mud, mine tailings, piling mud, river silt, etc.



They are pumped to the deep cone thickener, the flocculant is added to the thickener tank, and the concentration of the sludge in the thickener is increased by 60%-70% under flocculation and gravity precipitation.



Then sent to the belt filter presses, under the action of a gravity zone, a wedge zone, and a pressure zone , the sludge cake with water content of less than 20% is formed and the overflow clean water will be re-processing.





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