Abstract

The present invention provides a laterite-nickel ore processing method for efficiently recovering nickel resources, which can save the early pellet processing cost and improve the recovery rate of nickel. The method comprises the following steps of: (1) laterite-nickel ore classification: crushing and screening the laterite-nickel ore; adding the reducing coal and fluxing agent into the laterite-nickel ore being larger than 2 mm and directly feeding the mixture into a rotary hearth furnace; adding the reducing coal and fluxing agent into the laterite-nickel ore being smaller than 2 mm and pressing the mixture into carbon-containing pellets by a pellet press; and drying the carbon-containing pellets and feeding the pellets into the rotary hearth furnace; (2) pre-reduction: feeding the carbon-containing pellets into a heat-accumulation type coal-based rotary hearth furnace, and performing high-temperature quick reduction in the furnace, the reduction temperature being from 1,200°C to 1,300°C, and the reduction time being from 20 min to 45 min; (3) melting: feeding the discharge product of the rotary hearth furnace into a melting device for slag-iron separation to produce nickel-iron alloy; and (4) levigation, sorting and melting: crushing the melting slag obtained by Step (3), performing ore grinding and magnetic separation, and returning the metal iron powder after the magnetic separation to the melting device in Step (3) for slag-iron separation to obtain the nickel-iron alloy.

IPC Classes  ?

• C22B 23/00 - Obtaining nickel or cobalt
• C22B 1/00 - Preliminary treatment of ores or scrap
• C22B 5/10 - Dry processes by solid carbonaceous reducing agents
• C22B 1/16 - SinteringAgglomerating
• C22C 19/03 - Alloys based on nickel or cobalt based on nickel

Abstract

A coal pyrolysis device and a coal pyrolysis method for improving yield of tar by reducing secondary pyrolysis of the tar at high temperature. The coal pyrolysis device for improving yield of tar of the present invention comprises a furnace body, the furnace body being formed by a fixed furnace top, a furnace wall (4) and a rotary furnace bottom (2), a material bed (15) used for placing materials (7) being arranged on the rotary furnace bottom (2), an interval between the material bed (15) and the rotary furnace bottom (2) being an overhead space (3), and the material bed (15) being a ventilation material bed; and an air sucking opening (8) being arranged at one side of the overhead space (3) and being connected with a high-temperature fan (9) and an air outlet (10). In the coal pyrolysis device and the coal pyrolysis method for improving yield of tar of the present invention, by changing a furnace body structure in the rotary bed and an air flue, a gas flowing direction in a furnace is adjusted, and circulation of a thermal field inside the furnace and the function of heating a material are reinforced. Pyrolysis gas forcedly permeates a material layer under the action of the high-temperature fan (9), the flowing of gas in the furnace is reinforced, and heat transfer of the material layer is accelerated; and the situation of secondary pyrolysis of the tar resulting from secondary combination of macromolecular free radicals generated by original coal pyrolysis is reduced, so as to improve the yield of the tar through original coal pyrolysis.

IPC Classes  ?

• C10B 1/00 - Retorts
• C10B 47/18 - Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion with moving charge
• C10B 53/04 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal

Abstract

A device for treating refractory iron ore comprises a regenerative rotary hearth furnace. The regenerative rotary hearth furnace comprises a furnace chamber enclosed by an annular inner wall (2), an annular outer wall (3) and a furnace bottom (4). The furnace bottom (4) is rotatable. The furnace chamber is divided into a feeding area, a pre-heating area, a heating area, a high-temperature area, a control area and a discharge area. A feeding hole (5) is provided on the annular outer wall (3) of the feeding area, and a discharge hole (6) is provided on the annular outer wall (3) of the discharge area. Also provided is a method for treating refractory iron ore by using the device. The regenerative rotary hearth furnace in the device adopts a regenerative combustion technology, and therefore, the time of pellets in the pre-heating area of the rotary hearth furnace is shortened, the time of the pellets in a reducing area is indirectly increased and the metallization ratio of directly reduced iron is improved.

IPC Classes  ?

• C21B 13/00 - Making spongy iron or liquid steel, by direct processes

Abstract

Provided is a heat-accumulating type biomass pyrolysis method comprising following steps: (1) biomass pre-treatment; (2) biomass pyrolysis: the biomass raw materials treated in step (1) are pyrolyzed in a heat-accumulating type gas radiant tube rotating bed to generate gaseous substances and solid biochar; and (3) collection and post-treatment of the pyrolysis product: gaseous substances generated in step (2) are collected to separate pyrolysis gas and condensable liquid through condensation, and all or part of the pyrolysis gas is used as the fuel for the heat-accumulating type gas radiant tube; and the discharged solid biochar is collected after coke quenching and cooling. Also provided is a heat-accumulating type biomass pyrolysis system. The system comprises a heat-accumulating type gas radiant tube rotating bed (1), a biomass pre-treatment system (2) connected with the feed port of the heat-accumulating type gas radiant tube rotating bed (1), a coke quenching and cooling device (3) connected with the solid substance outlet of the heat-accumulating type gas radiant tube rotating bed (1), a condensing device (4) connected with the gaseous substance outlet of the heat-accumulating type gas radiant tube rotating bed (1), and a pre-heating device(5) connected with the fuel gas inlet of the heat-accumulating type gas radiant tube rotating bed (1). The pyrolysis gas outlet of the condensing device (4) is connected with a purifier (6). The purified gas outlet of the purifier (6) is connected with the fuel gas inlet of the preheating device (5), and the pre-heating device (5) is also provided with an air inlet.

IPC Classes  ?

• C10B 47/00 - Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
• C10B 53/02 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material

Abstract

Disclosed is a revolving bed retort for increasing tar yield of coal carbonization by activating an endogenous pyrolysis gas, wherein a recirculation air blower (12) is provided between a suspended space (3) in the revolving retort bottom (2) in the revolving bed retort and a retort chamber space above the revolving retort bottom (2), with the recirculation air blower (12) being provided at an inlet port thereof with a catalyst module (10) and an oxidant inlet (9). Also provided is a method for increasing tar yield of coal carbonization by using the revolving bed retort, wherein an endogenous pyrolysis gas from minerals themselves in the retort is activated under the effect of the recirculation air blower (12) and the action of an oxidant and a catalyst, and after activation, undergoes a pyrolysis reaction with raw coal. The pyrolysis gas produced from the reaction is cooled down, to form semicoke, tar, and coal gas as pyrolysis products. By means of the method, components, such as methane etc., in the activated endogenous pyrolysis gas can be utilized to combine with macromolecular radicals produced in the pyrolysis of raw coal, so as to increase the tar yield of raw coal pyrolysis.

IPC Classes  ?

• C10B 1/00 - Retorts
• C10B 47/18 - Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion with moving charge
• C10B 53/04 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
• C10G 1/00 - Production of liquid hydrocarbon mixtures from oil shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal

Abstract

Provided are a cyclone bed pulverized coal gasification method and a system thereof. The method comprises the following steps: drying and preheating raw coal with the particle size being smaller than or equal to 3 mm in a coal drying and preheating device (2); under the joint action of a mixed gasification agent of oxygen and steam, the dried and preheated raw coal being vertically divided into two and entering a cyclone bed gasifier (6) to undergo a gasification reaction to prepare gasified coal gas; the gasified coal gas entering a coal gas heat exchanger (9) to be further cooled after being chilled at the top of the cyclone bed gasifier (6), and then being purified in a coal gas purification system (11). The system comprises the drying and preheating device (2), the cyclone bed gasifier (6), a chilling gas compressor (8), the coal gas heat exchanger (9), and the coal gas purification system (11). The cyclone bed pulverized coal gasification method and system have the advantages that the structure and process are simple, the manufacturing costs are low, and the coal processing capacity is high.

IPC Classes  ?

• C10J 3/54 - Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
• C10J 3/84 - Gas withdrawal means with means for removing dust or tar from the gas
• C10J 3/72 - Other features

Abstract

A preparation method of coal hydropyrolysis and gasification coupling with high utilizing rate of total carbon of raw material and system thereof are provided. The method comprises the following steps: A, drying and preheating raw material coal with granularity less than or equal to 2mm in a coal drying and preheating system (1); B, After drying and preheating, putting 60-80% of raw coal into coal hydropyrolysis furnace (2) to carry out hydropyrolysis reaction, then the pyrolyzed gas phase product was purified and separated; C, putting all the semicoke generated by the coal hydropyrolysis furnace in a coke hydrogasification furnace to carry out hydrogasification, then gasification gas phase product was purified and separated; D, After drying and preheating, putting 20-40% of raw coal and high temperature coke particle from coal hydropyrolysis furnace into hydrogen-rich reactor (4) under interaction of mixed gasification agent of oxygen and water vapor to carry out gasification reaction. The generated hydrogen-rich gas is used as fluidized reaction gas of coal hydropyrolysis furnace.

IPC Classes  ?

• C10B 53/04 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
• C10B 49/10 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated in dispersed form according to the "fluidised bed" technique