1.Improving the durability of concrete structures

Iron and steel slag products are used in a variety of areas where their unique characteristics are put to effective use. The majority of the demand for these products comes from the field of cement. Approximately 40% of iron and steel slag products, and 60% of blast furnace slag, are used in cement. Most of these products are used as a raw material in Portland blast furnace slag cement. Portland blast furnace slag cement has the following characteristics.

(1) It has high resistance to seawater and to chemicals, and can improve durability.

(2) It has a low chloride ion diffusion coefficient (resists rebar corrosion).

(3) It can reduce alkali-aggregate reaction.

(4) Its strength increases over time.

(5) It produces little elution of hexavalent chrome when used in ground improvement.

This product is also increasingly being used in construction projects. For reasons including the generally large material cross-sections, ease of ensuring concrete curing time, and the relatively large cover it provides, Portland blast furnace slag cement is suitable for use in structures such as piles, foundations, underground beams, and continuous walls. With the CASBEE evaluation system that is increasingly being instituted by local governments and under the Tokyo Metropolitan Environmental Building System, the use of Portland blast furnace slag cement adds points to the evaluation score.

2.Reducing CO2 emissions

Expanding the use of Portland blast furnace slag cement is one measure included in the plan to achieve the targets of the Kyoto Protocol, and there are large expectations for its ability to help reduce CO2 emissions. Under the Kyoto Protocol,Specifically, the use of 20% Portland blast furnace slag cement in the construction of a single apartment complex would result in a per-household CO2 reduction of approximately 1,200 kg. These effects have been recognized by the national government, local governmental organizations, and private companies, and there is growing momentum toward stopping global warming by expanding the use of Portland blast furnace slag cement.

3.slag grinding plant case:

Shanghai Baosteel 1.5 million t/a EPC composite powder production line

 

A grand ceremony is held in Ningbo on April 27, 2017! The production line of 1.5 million tons of composite powder of Ningbo Ziheng, Shanghai Baosteel which is contracted by CHAENG(Great Wall Machinery Co.,Ltd) was put into production successfully.

 

Significance of the project

In order to study the recycling of steel slag, slag and waste from steel factory and solve the problem of steel mills zero emissions, Shanghai baosteel build this demonstration project of comprehensive utilization of steel slag composite powder in domestic. This plays a leading role for the comprehensive utilization of steel slag , solves the secondary effects on the environment of steel mill solid waste, and improves the efficiency of the enterprise.

 

 

Slag Grinding Plant Process Flow

Piles of slag are taken and fed by the forklift truck, and conveyed by a belt conveyor. During the process of conveying, slag raw material will be iron-removing and screening through magnetic separator and vibrating screen, and then go to the weigher cabin, elevator and last to the vertical roller mill for grinding process. The ground granulated slag powder is drying by the hot air supplied by hot blast furnace, and with the help of hot air, the powder selecting is made in the separator. The qualified slag powder particles will be collected by bag filter, then conveyed and stored in the silos by the air slide and elevator.

Vertical roller mill

CHAENG vertical roller mill can meet the production line project of 20 ~ 1.5 million tons per year. We have received high praise from more than 90 customers, making CHAENG machine an important part of the core technology of the industry. CHAENG has been carrying out the ambitious goal of "the inheritors and the developer of the vertical roller mill".

 

Advantages

1. Incorporated the function of pulverizing, grinding, drying, separating and conveying.

2. High Powder efficiency, large drying capacity

3. Low noise and low power consumption

4. Low running cost

5. 20 national patents

6. Easy to adjust product fineness

7. Simple process , small abrasion

Ball mill

CHAENG ball mill is the new equipment after modification conducted on the basis of traditional ball mill. the original structure has been optimized, and is widely used in industry of cement, silicate products, new building material, refractory material, fertilizer, metal processing and glass ceramics production industry.

 

Advantages:

1. Obtain the "double slipper ball mill" practical new patent certificate

2. The process is simple and the maintenance cost is extremely low

3. Reduce energy consumption by 30% and increase the amount of processing by 15-20%

4. The product rate is high, the operation is more stable

Process highlights

The hot blast furnace of this production line adopts the blast furnace gas discharged from the steel mill. Blast furnace gas has the features of strong toxicity, low calorific value, and mostly released into the air, so the recycling of blast furnace gas in slag grinding plant minimizes the pollution to the surrounding environment, also dispense the high environmental taxes. The recycle of blast furnace gas can realize the double benefit of economy and environment.