Lin Gao Qiming

Chapter 804

With the loading and unloading equipment in place, all that remains is to install the concentrator.The Ministry of Metallurgical Industry has installed a set of concentrator equipment brought from old time and space in Lingao.In order to save shipping tonnage and accumulate experience for future metallurgical machinery manufacturing, it finally decided to install a set of self-made mineral processing equipment in Sanya.

The infrastructure project of the concentrator was completed years ago.The technology of the concentrator is not complicated.The General Machinery Factory has accumulated some experience in the manufacture of mineral processing equipment—it has built a coal preparation plant for Jiazi Coal Mine in the past.

Concentrators are more complex than coal washers.The technical requirements are also high. Since the Crossing Group cannot manufacture large-scale electromagnets, magnetic beneficiation is completely impossible, and the beneficiation plant can only base itself on the technically simple hydraulic jigging beneficiation method.This process has relatively low technical requirements for equipment.

In order to facilitate smelting, iron ore must be screened before being transported to the steel plant.The purpose of screening is to improve the efficiency of smelting, increase the ratio of iron tapping, and improve the efficiency of coal use.Iron ore with an iron content of more than 65% can be directly put into the open hearth furnace for steelmaking, and more than 45% is used for blast furnace ironmaking. The ore with less than 45% iron content must be screened, crushed and sintered to increase the iron content of the ore to More than 45% to make iron.Less than 25% belongs to lean ore, which is generally discarded.One of the characteristics of China's iron ore is that it has a lot of lean ore, so steel companies generally have to import iron ore.The imported iron ore is basically the concentrate powder processed by the concentrator.

The ores of Tiandu and Shilu belong to rich ore, and the requirements for increasing the iron content through screening ore are not high. The ore concentrator is mainly based on ore crushing and classification.Regardless of whether it is an open hearth furnace or a blast furnace, iron ore needs to be crushed to a certain particle size before it can be fully utilized.The ore particles must be fine and consistent in size to increase the production of steel.

Sanya's concentrator is located in Tiandu Town, where Tiandu Mining Bureau is located - it is convenient to use the water source of Tiandu River Reservoir nearby: the jigging method requires a lot of water: about 1-3000 liters of water is required for processing 4000 ton of ore, Belongs to the large water consumption.Therefore, the concentrator also built a supporting water recycling system.Including drains, tertiary sedimentation tanks, filter tanks and pumping equipment.Mineral dressing mainly utilizes the buoyancy of water, and does not have high requirements on water quality itself, and can use recycled wastewater that is simply treated.

After the ore is sent to the concentrator by rail car, it is first crushed.Grinding should be carried out three times, coarse crushing, medium crushing and fine crushing.Finally, the iron ore is crushed into 5-10mm ore particles.The ore is first poured into a cylindrical crusher.The principle of the pulverizer is very simple. There is a large cylinder with many cast iron bars installed in it. Driven by the belt, the cylinder rotates at high speed to crush the iron ore in the cylinder.The crushing rods inside the crusher have different sizes, which can be changed to adjust the crushing size.However, in order to meet the requirements of continuous production, the concentrator uses a special crusher for each process to save the time spent on replacing the broken rods.

After each crushing, the ore must be poured into the vibrating screening machine, and the crushed ore particles will be separated by vibrating screening, and the ore that meets the standard for the next step will be poured into the second crusher, and cannot be returned through the sieve hole. Processing continues in the primary shredder.

After the third crushing, the ore is poured into the spiral separator for beneficiation.The ore processing efficiency of the spiral separator is very high, and the metal ore recovery rate can reach 96% - and the labor intensity is very small.The shape of the spiral separator is similar to the spiral slide in the park.The principle is: under the action of water, the ore flows downward along the spiral line due to gravity, and due to friction and centrifugal force, the relatively light waste rock particles move close to the outer edge of the spiral groove, and the heavy ore will change the surface. Move down the inside line.At a certain position, the ore particles are discharged by the interceptor installed on the inner edge of the spiral groove.

After passing through the spiral separator, it is the middle ore.After the medium ore is treated by hydraulic sieving, it is processed by a shaker, and finally the concentrate is obtained.As for the medium ore, it can be used for repeated jigging processing.

The entire concentrator is equipped with jigs, vibrating screening machines, spiral separators, pulverizers, hydraulic screens and water shakers. In addition, it is planned to build a 20 cubic meter ore sintering furnace for sintering ore powder.After testing, the entire concentrator can process 30 tons of ore per hour.Because the equipment is relatively simple, it is easy to expand the treatment capacity as long as sufficient water source can be guaranteed.

The waves along the coast of the Mayao Peninsula are beating against the reefs, and several medium and small boats are moored in the small bay on the shore, undulating with the waves.The land here is barren, full of weeds and bare red soil.The few trees swaying in the sea breeze.There are no rice fields that are common on both sides of the Wenlan River on the Mayao Peninsula, and there are a few dry fields dotted between large tracts of undeveloped wasteland. This place was the so-called "Golden Port Economic Development Zone" in the old days and belonged to the economic development zone of Hainan Province. .However, in the old time and space, despite the auspicious name, the Gold Medal Development Zone was still struggling. A series of large-scale projects such as the ro-ro terminal project in 89 and the 93 million tons/year oil refining project in 600 failed to settle here.Until the beginning of the 21st century, it was just a reserve of industrial land.

In this time and space, the Planning Institute positioned this place in the future Lingao heavy industrial zone. Because the Hongpai Development Zone has been stumbling in the old time and space, the Planning Institute finally named it "Ma Niao Industrial Zone".

Originally, due to safety considerations, the iron and steel and heavy chemical enterprises of the Crossing Group were generally located in the Wenlan River estuary area and outside Bairen City.That is, limited by the available land area—most of the paddy fields along the river have been developed for many years, it is a waste for agriculture to use it as an industrial area, and the construction of the paddy field foundation is also very troublesome—the development potential is limited, There are also increasingly serious problems of water pollution and air pollution.In the plan, the Planning Institute will gradually transfer the large-scale production bases of the steel and chemical industries to the development zone of the Mayao Peninsula.

After the Battle of Chengmai, the influence of the Senate expanded to the entire Hainan Island, and the Malong Peninsula, which was originally close to the front line, became the core area of ​​the Lingao regime.Mayao Commune is "proven"; the command of the sea in the Qiongzhou Strait is controlled by the navy, and the army base of the Fubo Army is located in Mayiao Commune.The safety of the newly-built steel and heavy chemical industry zones has been reliably guaranteed.

Mayao Peninsula faces the sea on three sides, Hongpai Port on the east, and Qiongzhou Strait on the north. It is 65 kilometers away from Haikou Weisuo and 12 kilometers away from Lingao County.The development zone planned by the Construction Corporation is composed of two groups, the east and the west, with a planned area of ​​20.5 square kilometers.The land here is open and flat, mostly dry land, with only a few paddy fields.The infrastructure is in good condition.The total local permanent population is only about [-] saltworks workers and their families in Mayiao Commune, and there are no residential areas that need to be relocated in large numbers.It is a large-scale industrial area suitable for development in large scale.

The development zone itself has a natural port called Hongbai Port, and the total length of the coastline in the zone is about 16.5 kilometers.There are certain conditions for the establishment of a port.The road construction implemented by the Planning Institute in Lingao County: the "Small Cross Road" plan has been completed.At that time, the Bopu-Maniao Highway, which was urgently started in preparation for the war, was paved day and night by thousands of prisoners of war laborers.The transportation link in the development and construction of the industrial zone has been preliminarily resolved.

According to the plan, the third expansion of the iron and steel industry should start in April 1630. However, due to the impact of the Battle of Chengmai during this period, it was in a state of semi-stop, but the project resumed as soon as the war ended.Benefiting from the dividends of war-a large number of captive labor was put into use, the project barely caught up with the progress.As the Fubo Army began to occupy the entire Hainan Island, the speed of collection and transportation of many materials was greatly accelerated, especially the large amount of wood needed for construction, and the supply began to be sufficient.

Ji Wusheng was wearing a dusty and black overalls, standing on a small hill made of waste soil, overlooking the construction site of the entire iron and steel complex.The future Mariao Iron and Steel Complex will rise in this barren land.Here is the temporary construction headquarters: the temporary house converted from the container is on the rammed flat ground at the top of the hill.The blades of wind turbines and anemometers are spinning rapidly in the sea breeze.

Below the hillside are temporary work sheds, specially for skilled workers.Smoke is rising from the chimney of a boiler that provides hot water and meals to the entire construction site.Drinking water is delivered from the waterworks at the Mayao base a few kilometers away by tank carts pulled by bullock carts.The water of the Mayao River has been purified there, and it can be safely eaten after being sent here and boiled.

The laborers for the project came from captives in the second anti-encirclement campaign, as well as "special laborers" captured in the security wars in Danzhou, Chengmai, Wenchang, Qiongshan and other places.They all lived in the prisoner camp at the Mayao Army Base, and came to the construction site every day as a squadron.The other part comes from the "dispatch of workers" from various communes and the direct recruitment of labor—it has become an important source of income for local farmers to participate in construction for a short time to earn remuneration through recruitment.

The construction materials transported from various factories are piled up on the stockyard: bundles of steel bars and bamboo bars used to cast concrete; steel and wrought iron profiles; various specifications of construction timber and bamboo; stacks of red Bricks and shingles; countless sacks of cement stacked under awnings; rows of two-wheeled dump carts; refractory bricks from the bittern factory in the Mariao saltworks...

Workers are building access roads and laying makeshift freight tracks -- bringing tons of cargo to each site.Five or six mobile pottery machines spray black smoke and white gas to provide power for Lingao local construction machinery such as cranes, pile drivers, mixers, etc. The snort of pile drivers, the creak of cranes and the roar of mixers sounds mixed together.

(End of this chapter)