阅读说明：本技术 一种气化细渣碳灰分离高梯度磁选装置与工艺 (High-gradient magnetic separation device and process for separating gasified fine slag carbon ash ) 是由 樊盼盼 董连平 王建成 鲍卫仁 樊民强 于 2020-06-16 设计创作，主要内容包括：本发明公开了一种气化细渣碳灰分离高梯度磁选装置与工艺。所述高梯度磁选装置包括分选腔、连接管路及多个矿浆桶,分选腔为上下开口的筒锥结构,分选腔外部同轴设置空心励磁线圈,空心励磁线圈中心高度与分选腔中心高度平齐；分选腔内部中心处放置高梯度介质块；分选腔、高梯度介质块和空心励磁线圈的中心高度平齐。通过高梯度磁选装置操作参数和工艺流程的调节,即可达到预定分离效果。该方法分离效率高,生产成本低,工艺简单,分离后的高灰产品符合建材原料烧失量的要求,分离后的富碳产品由于灰的脱除,也进一步实现了炭的富集,可考虑作为锅炉掺烧原料或生态修复剂使用。(The invention discloses a high-gradient magnetic separation device and a high-gradient magnetic separation process for separating gasified fine slag carbon ash. The high-gradient magnetic separation device comprises a separation cavity, a connecting pipeline and a plurality of slurry buckets, wherein the separation cavity is of a cone structure with an upper opening and a lower opening, a hollow excitation coil is coaxially arranged outside the separation cavity, and the center height of the hollow excitation coil is flush with the center height of the separation cavity; a high-gradient medium block is placed in the center of the interior of the separation cavity; the separation cavity, the high gradient medium block and the hollow magnet exciting coil are parallel and level in central height. The preset separation effect can be achieved by adjusting the operating parameters and the process flow of the high-gradient magnetic separation device. The method has the advantages of high separation efficiency, low production cost and simple process, the separated high-ash product meets the requirement of the loss on ignition of the building material raw material, the carbon enrichment of the separated carbon-rich product is further realized due to the removal of ash, and the carbon-rich product can be considered to be used as a boiler co-combustion raw material or an ecological restoration agent.)

1. The utility model provides a gasification fine slag carbon dust separation high gradient magnetic separation device which characterized in that: the ore pulp separation device comprises a separation cavity, a connecting pipeline and a plurality of ore pulp buckets, wherein the separation cavity is of a cylinder cone structure with an upper opening and a lower opening, a hollow excitation coil is coaxially arranged outside the separation cavity, and the center height of the hollow excitation coil is flush with the center height of the separation cavity; a high gradient medium block is arranged at the center inside the sorting cavity; the separation cavity, the high gradient medium block and the hollow magnet exciting coil are parallel and level in central height.

2. The high-gradient magnetic separation device for separating the gasified fine slag carbon ash according to claim 1, which is characterized in that: the high gradient medium block consists of a high gradient magnetic medium layer and a non-magnetic support, and the high gradient magnetic medium layer is stacked in the non-magnetic support in a layered mode; the overflow aperture of the high-gradient medium block is equal to 3 times of the maximum granularity of the gasified fine slag.

3. The high-gradient magnetic separation device for separating the gasified fine slag carbon ash according to claim 2, which is characterized in that: the high-gradient medium layer is formed by irregularly, discontinuously and freely piling up rod-shaped, net-shaped, shuttle-shaped or diamond-shaped strong magnetic conduction material scraps;

the non-magnetic conductive support frame is a screen-shaped support body made of polyurethane, copper or non-magnetic conductive stainless steel materials.

4. The high-gradient magnetic separation device for separating the gasified fine slag carbon ash according to claim 2, which is characterized in that: the high gradient medium block is formed by stacking 10 layers of magnetic conducting medium layers.

5. A high-gradient magnetic separation process for separating gasified fine slag carbon ash, which adopts the high-gradient magnetic separation device for separating gasified fine slag carbon ash as claimed in any one of claims 1 to 4, and is characterized by comprising any one of the following steps:

(1) single-stage high-gradient magnetic separation process

Screening the raw materials by a grading sieve, grinding the materials with large granularity on the sieve, returning to the sieving, preparing the materials with qualified granularity under the sieve into ore pulp, and performing high-gradient magnetic separation to form a ferromagnetic high-ash product and a carbon-rich product;

(2) two-stage high-gradient magnetic separation process

When the configured ore pulp is high in concentration, the raw materials are screened by a classifying screen, large-particle materials on the screen are ground and then returned to be screened again, materials with qualified undersize are prepared into ore pulp and then subjected to primary high-gradient magnetic separation to form a ferromagnetic high-ash product I and a carbon-rich product I, the carbon-rich product I is subjected to secondary high-gradient magnetic separation and then separated again to form a ferromagnetic high-ash product II and a carbon-rich product II, and the ferromagnetic high-ash product I and the ferromagnetic high-ash product II are combined.

6. The high-gradient magnetic separation process for separating gasified fine slag carbon ash according to claim 5, which is characterized by comprising the following steps:

(1) after the gasified fine slag is screened and ground, the product with qualified granularity and water are prepared into ore pulp with uniform concentration of 50-200 g/L;

(2) an excitation power supply of a hollow excitation coil outside the separation cavity is switched on, and the current is adjusted to adjust the background magnetic field intensity of the magnetic separation space;

(3) closing a flushing water valve and a magnetic material pipeline valve, opening an ore pulp pipeline valve and a carbon-rich product pipeline valve, and enabling ore pulp to slowly and uniformly flow through a separation cavity for separation through gravity flow of fluid or conveying of the fluid by a pump;

(4) after the ore pulp completely flows through the separation cavity, closing an ore pulp pipeline valve and a carbon-rich product pipeline valve;

turning off a power supply, and opening a washing water pipeline valve and a ferromagnetic high-ash product pipeline valve after demagnetizing the high-gradient medium block, so as to wash and collect ferromagnetic high-ash products adsorbed on the high-gradient block;

(5) and (4) filtering and drying the collected carbon-rich product and ferromagnetic high-ash product, and then carrying out subsequent treatment.

7. The high-gradient magnetic separation process for separating gasified fine slag carbon ash according to claim 6, which is characterized in that: in the step (2), the field intensity of the formed magnetic field background is above 1.0T.

8. The high-gradient magnetic separation process for separating gasified fine slag carbon ash according to claim 6, which is characterized in that: in the step (3), in order to prevent short-circuit flow, the high-gradient medium block is in clearance fit with the separation cavity, ore pulp flows into and is distributed on the high-gradient medium block uniformly, and an ore pulp distributor is arranged if necessary.

9. The high-gradient magnetic separation process for separating gasified fine slag carbon ash according to claim 6, which is characterized in that: in the step (3), under the condition that the excitation power supply is switched on, a small amount of washing water is intermittently introduced to wash the nonmagnetic substances adhered to the high-gradient medium layer, so that the purity of the ferromagnetic product is improved.

Technical Field

The invention relates to a wet high-gradient magnetic separation ash reduction method for gasified fine slag, in particular to a device and a process for realizing the separation of carbon ash from the gasified fine slag by using a high-gradient magnetic separation device, and belongs to the field of resource utilization of gasified ash slag.

Background

The coal gasification technology is a leading and core technology of the modern coal chemical industry. During the coal gasification process, two carbon-containing byproducts of gasification coarse slag and fine slag are generated. The coarse slag is mostly solid with the size of glass spherical bean grains, the porosity of the slag is small, the carbon content is generally less than 5%, the water content is low, and the components are similar to those of boiler ash, so the coarse slag can be used together with the boiler ash and can be used as a blending raw material for cement, concrete, sintered bricks, engineering backfill and the like. The carbon residue content of the fine slag is higher, generally more than 20 percent, even more than 40 percent, and far higher than the requirement that the utilization loss of the boiler fly ash is less than or equal to 15 percent, so before the gasification fine slag is recycled, carbon ash separation is firstly carried out on the gasification fine slag.

By utilizing the characteristics of the carbon and ash component surface hydrophilicity and hydrophobicity of the gasified fine slag, the gasified fine slag is ground to be less than 0.5mm to be used as a flotation feed material in Zhao Shi Yong (Chinese patent 201620500503. X), and conventional flotation reagents are selected for separation, wherein the ignition loss of the concentrate is 50.78%, the ignition loss of the tailings is 41.92%, the ignition loss of the concentrate and the ignition loss of the tailings show certain difference, but the overall flotation effect is not ideal. The method is characterized in that the gasification fine slag is sorted and upgraded by a flotation machine in Pujiong (Pujiong, coal gasification fine slag surface property analysis and flotation upgrading research, China coal, 2019, (01): p.107- & lt112- & gt), a carbon residue product with ash content of 24.25%, yield of 58.05% and a high-ash product with ash content of 83.48% are obtained, carbon-ash separation is realized to a large extent, but the loss of ignition of the high-ash product still cannot meet the requirements of the building material industry.

The elemental composition analysis of the gasified fine slag contains a large amount of magnetic elements such as Fe, Mn, Ti and the like in addition to the main elements such as Si, Al, Ca and the like, and inorganic minerals composed of the magnetic elements are also main contributors to the ash content of the gasified fine slag. Therefore, the method for separating the gasified slag by using high-gradient magnetic separation according to the magnetic difference of the minerals is also an effective method for realizing deashing and carbon removal.

Disclosure of Invention

The invention aims to provide a high-gradient magnetic separation device and a high-gradient magnetic separation process for separating gasified fine slag carbon ash.

The invention provides a process for realizing gasification fine slag carbon-ash separation by wet high-gradient magnetic separation. The preset separation effect can be achieved by adjusting the operating parameters and the process flow of the high-gradient magnetic separation device. The method has the advantages of high separation efficiency, low production cost and simple process, the separated high-ash product meets the requirement of the ignition loss of the building material raw material, the carbon enrichment of the separated carbon-rich product is further realized due to the removal of ash, and the carbon-rich product can be considered to be used as a boiler co-combustion raw material or an ecological restoration agent.

The invention provides a high-gradient magnetic separation device which comprises a separation cavity, a connecting pipeline and a plurality of slurry barrels, wherein the separation cavity is of a cylinder-cone structure with an upper opening and a lower opening, a hollow excitation coil is coaxially arranged outside the separation cavity, and the center height of the hollow excitation coil is flush with the center height of the separation cavity; a high-gradient medium block is placed in the center of the interior of the separation cavity; the overflowing aperture of the high-gradient medium block is preferably equal to 3 times of the maximum particle size of gasified fine slag, and the central heights of the separation cavity, the high-gradient medium block and the hollow magnet exciting coil are parallel and level.

The high gradient medium block consists of a high gradient magnetic medium layer and a non-magnetic support frame, and the high gradient magnetic medium layer is stacked in the non-magnetic support frame in a layered manner to form the high gradient magnetic medium block; the high gradient medium layer is formed by irregular and discontinuous free accumulation of chips of rodlike, reticular, fusiform and rhombus-like high-permeability magnetic materials, and the non-permeability magnetic support frame is a screen mesh support body made of polyurethane, copper or non-permeability magnetic stainless steel materials.

Preferably, the high gradient dielectric block is formed by stacking 10 layers of magnetic conductive dielectric layers.

The invention relates to a process for realizing separation of gasified fine slag and carbon ash by using a high-gradient magnetic separation device, which comprises the following steps of:

(1) after the gasified fine slag is screened and ground, the product with qualified granularity and water are prepared into ore pulp with uniform concentration of 50-200 g/L;

(2) a hollow magnet exciting coil excitation power supply outside the separation cavity is switched on, and the current is adjusted to adjust the background magnetic field intensity of the magnetic separation space;

(3) closing a flushing water valve and a magnetic material pipeline valve, opening an ore pulp pipeline valve and a carbon-rich product pipeline valve, and enabling ore pulp to slowly and uniformly flow through a separation cavity for separation through gravity flow of fluid or conveying of the fluid by a pump;

(4) and after the ore pulp completely flows through the separation cavity, closing the ore pulp pipeline valve and the carbon-rich product pipeline valve. Turning off a power supply, and opening a washing water pipeline valve and a ferromagnetic high-ash product pipeline valve after demagnetizing the high-gradient medium block, so as to wash and collect ferromagnetic high-ash products adsorbed on the high-gradient block;

(5) and (4) filtering and drying the carbon-rich product and the ferromagnetic high-ash product, and then carrying out subsequent treatment.

In the step (2) of the method, the field intensity of the formed magnetic field background is more than 1.0T.

In the step (3) of the method, in order to prevent short-circuit flow, the high-gradient medium block is in clearance fit with the separation cavity, ore pulp flows into and is distributed on the high-gradient medium block uniformly, and an ore pulp distributor is arranged if necessary.

In the step (3) of the method, if necessary, under the condition that the excitation power supply is switched on, a small amount of washing water can be intermittently introduced to wash the nonmagnetic substances adhered to the high-gradient medium layer, so that the purity of the ferromagnetic product is improved.

When the ore pulp amount is large, the batch treatment of the steps (1) to (4) is repeated to prevent the high-gradient medium blocks from adsorbing and supersaturating.

The invention provides a process for realizing separation of gasified fine slag carbon ash by using a high-gradient magnetic separation device, which comprises the following two steps according to separation requirements:

the sorting process 1: single-stage high-gradient magnetic separation process

The raw materials are screened by a grading screen, the materials with large granularity on the screen are ground and then returned to the screen again, the materials with qualified granularity under the screen are prepared into ore pulp and then are subjected to high-gradient magnetic separation, and a ferromagnetic high-ash product and a carbon-rich product are formed.

And (3) a sorting process 2: two-stage high-gradient magnetic separation process

When the configured ore pulp is high in concentration, the raw materials are screened by a classifying screen, large-particle materials on the screen are ground and then returned to be screened again, materials with qualified undersize are prepared into ore pulp and then subjected to primary high-gradient magnetic separation to form a ferromagnetic high-ash product I and a carbon-rich product I, the carbon-rich product I is subjected to secondary high-gradient magnetic separation and then separated again to form a ferromagnetic high-ash product II and a carbon-rich product II, and the ferromagnetic high-ash product I and the ferromagnetic high-ash product II are combined.

The invention has the beneficial effects that:

according to the process and the method for realizing the carbon-ash separation of the gasified fine slag by using the high-gradient magnetic separation device, the separation of ferromagnetic high-ash products and nonmagnetic carbon-rich products can be realized only by adjusting the magnetic field intensity of a separation area, the high-gradient medium block structure and the separation process according to the separation requirement; compared with other methods, the method has the following advantages: the device is simple and easy to operate, high in separation efficiency and high in separation precision, and can realize continuous separation of materials.

Drawings

FIG. 1 is a schematic view of a high gradient apparatus for gasifying fine slag according to the present invention.

FIG. 2 is a schematic structural diagram of a high gradient dielectric block of the present invention.

In the figure: f 1-ore pulp feeding valve, f 2-flushing water valve, f 3-magnetic material valve, f 4-non-magnetic material valve, 1-separation cavity, 2-high gradient medium block, 3-hollow magnet exciting coil, 4-high gradient medium layer and 5-non-magnetic conductive net support.

A is ore pulp, B is washing water, C is ferromagnetic high-ash product, and D is non-magnetic carbon-rich product.

Detailed Description

The present invention is further illustrated by, but is not limited to, the following examples.

The high gradient magnetic separation device used in the invention is shown in figures 1 and 2:

a high-gradient magnetic separation device comprises a separation cavity 1, wherein the separation cavity 1 is of a cylindrical cone structure with an upper opening and a lower opening, a hollow excitation coil 3 is coaxially arranged outside the separation cavity 1, and the height center of the hollow excitation coil 3 is flush with the height center of the separation cavity 1; a high-gradient medium block 2 is arranged at the center inside the separation cavity 1, and the height of the high-gradient medium block 2 is lower than that of the separation cavity 1; the separation cavity 1, the high gradient medium block 2 and the hollow magnet exciting coil 3 are level in height center.

The high gradient medium block 2 is formed by combining a magnetic conduction medium layer 4 formed by irregularly, discontinuously and freely accumulating silicon steel turning chips for a high magnetic conduction electrician and a net-shaped support body 5 made of non-magnetic conduction stainless steel; preferably, the high gradient dielectric block 2 is formed by stacking 10 layers of magnetic conductive dielectric layers 4.

The use process of the device is as follows: the ore pulp A and the flushing water B to be separated are respectively communicated with the upper part of the separation cavity 1 through pipelines, an ore pulp feeding valve f1 and a flushing water valve f2 are arranged on the pipelines, the ore pulp is separated by the high-gradient medium block 2 in the separation cavity 1, the nonmagnetic carbon-rich product D and the ferromagnetic high-ash product C are respectively communicated with the lower part of the separation cavity 1 through pipelines, and a magnetic material valve f3 and a magnetic material valve f4 are respectively arranged on the pipelines. The flow of the slurry in the pipe is driven by the slurry gravity.