阅读说明：本技术 一种再生铝高效回收方法 (High-efficiency recovery method for secondary aluminum ) 是由 张秋合 郭军辉 王妍妍 郑聚备 李�浩 于 2019-12-06 设计创作，主要内容包括：本发明公开一种再生铝高效回收方法,包括以下步骤：再生铝熔炼、熔体精炼、铝灰转运、铝灰加温、回收铝液和重新利用；本发明先对再生铝进行熔炼,并加入覆盖剂和除气剂,减少烧损、提高铝的回收率并保证铝的质量,在这过程中,通过烟气净化设备净化烟气,减少污染,且熔炼后,通过惰性气体将精炼剂喷入熔体内,并配合搅拌使精炼反应效果更好,从而优化后续浮渣燃烧及铝灰加温分离出铝液的回收率,同时,通过磁选机回收灰渣中的金属颗粒,有利于提高整体的回收利用率,减少浪费,另外,铝液回收后以液态状态重新加入铸造炉内,进行重新铸造,有利于节省冷却后再次重熔的燃耗和污染物的排放。(The invention discloses a high-efficiency recovery method of secondary aluminum, which comprises the following steps: smelting secondary aluminum, refining melt, transferring aluminum ash, heating the aluminum ash, recovering aluminum liquid and reusing; the invention firstly smelts the secondary aluminum, and adds covering agent and degasifier, reduces burning loss, improves the recovery rate of aluminum and ensures the quality of aluminum, in the process, the smoke is purified by smoke purification equipment, the pollution is reduced, after smelting, the refining agent is sprayed into the melt by inert gas, and the refining reaction effect is better by matching with stirring, thereby optimizing the subsequent dross combustion and the recovery rate of aluminum ash by heating and separating out aluminum liquid, meanwhile, the metal particles in ash slag are recovered by a magnetic separator, the integral recovery utilization rate is improved, the waste is reduced, in addition, the aluminum liquid is added into the casting furnace again in a liquid state after being recovered, the casting is carried out again, and the combustion consumption of remelting after cooling and the discharge of pollutants are saved.)

1. A method for efficiently recovering secondary aluminum is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: smelting of secondary aluminium

Putting the secondary aluminum into a smelting furnace, heating to 700-750 ℃, and smelting for 60-90min to melt the secondary aluminum into a melt;

step two: melt refining

After the secondary aluminum in the first step is melted into a melt, uniformly blowing 1.0-1.5 per thousand of granular refining agent into the melt by using a refining powder blower by using inert gas nitrogen as a carrier, standing for 10-20min, decomposing part of components in the refining agent at high temperature, reacting the generated gas with hydrogen, adsorbing slag inclusion, rapidly escaping from the melt, removing hydrogen and floating oxidation slag inclusion in the melt, and removing slag from other components in the refining agent to enable inclusions in the melt to float on the liquid level of the melt;

step three: aluminum ash transfer

Continuously standing the melt to enable the dross floating on the liquid surface of the melt to contain aluminum to generate a combustion reaction with the high-temperature melt, heating, monitoring the temperature of aluminum ash in the dross to 550-650 ℃ by using thermal imaging equipment, using an ash-removing rake to remove the aluminum ash out of a hearth, removing the aluminum ash into a transfer device, and transferring the aluminum ash into a rotary kiln by the transfer device;

step four: heating of aluminium ash

Heating the aluminum ash by using a combustion system at a cellar opening of the rotary cellar, and monitoring the temperature of the aluminum ash in the rotary cellar through thermal imaging equipment to enable the temperature to reach 800-;

step five: recovering aluminium liquid

After the design temperature is reached, starting the rotary kiln, carrying out rotary calcination to separate ash and aluminum in the aluminum ash, and then recovering the aluminum liquid;

step six: reuse of

Transferring the aluminum liquid recovered in the fifth step through a transfer device, and adding the aluminum liquid into the hearth of the casting furnace again in a liquid state for re-casting utilization.

2. The high-efficiency recovery method of secondary aluminum according to claim 1, characterized in that: in the first step, in the smelting process, a covering agent and a degasifier are added, and meanwhile, a smelting furnace is externally connected with a flue gas purification device to purify waste gas and smoke dust generated in the smelting process.

3. The high-efficiency recovery method of secondary aluminum according to claim 1, characterized in that: in the second step, the granular refining agent comprises the following components: 87.1 percent of sodium chloride, 6.8 percent of potassium chloride, 4.3 percent of sodium sulfate, 1.2 percent of silicon dioxide and 0.6 percent of nano-rod.

4. The high-efficiency recovery method of secondary aluminum according to claim 1, characterized in that: in the second step, 1.0-1.5 per mill of granular refining agent is uniformly blown into the melt, and then the mixed melt is stirred by an electromagnetic stirring system for 5-10 min.

5. The high-efficiency recovery method of secondary aluminum according to claim 1, characterized in that: and in the third step, placing the melt into a rotary kiln for standing, and heating to raise the temperature so as to burn the dross containing the aluminum and the high-temperature melt.

6. The high-efficiency recovery method of secondary aluminum according to claim 1, characterized in that: and in the fifth step, after the rotary kiln is started, stirring the aluminum ash in the rotary kiln by the stirring rake to control the combustion of the aluminum ash, controlling the temperature in the rotary kiln to be 800-900 ℃ in the process, and stirring for 30-50 min to melt the aluminum in the aluminum ash into aluminum liquid, wherein the rest is ash.

7. The high-efficiency recovery method of secondary aluminum according to claim 1, characterized in that: and in the fifth step, after the aluminum liquid is recovered, transferring the residual ash in the rotary kiln to a cooling tank for cooling, pouring the ash into a magnetic separator after cooling, and adsorbing and recovering metal particles in the ash through the action of magnetic separation.

Technical Field

The invention relates to the technical field of recovery methods, in particular to a high-efficiency recovery method of secondary aluminum.

Background

China is a big country of aluminum yield, but compared with other developed countries, the structure of the whole industry is unreasonable, the scale development of the secondary aluminum industry is lagged, the development of the secondary aluminum industry can solve the crisis of the aluminum industry in China, the development trend of the aluminum industry in the world is met, and the requirements of sustainable development and scientific development of relevant policies in China are met, so the structure of the aluminum industry in China urgently needs to increase the development proportion of the secondary aluminum industry;

the invention discloses a method for recycling aluminum, which is characterized in that the aluminum is a recyclable resource, the recycled aluminum accounts for more than 1/3 of the annual yield of the original aluminum in the world at present, the recycled aluminum has the same performance with the original aluminum, can be remelted, refined and purified by a recycled aluminum ingot, and is prepared into various cast aluminum alloys and deformed aluminum alloys by adjusting chemical components so as to be further processed into aluminum castings or plastic processing aluminum products.

Disclosure of Invention

In order to solve the problems, the invention provides a high-efficiency recovery method of secondary aluminum, which comprises the steps of smelting the secondary aluminum, adding a covering agent and a degassing agent, reducing burning loss, improving the recovery rate of aluminum and ensuring the quality of the aluminum.

In order to solve the problems, the invention provides a method for efficiently recovering secondary aluminum, which comprises the following steps:

the method comprises the following steps: smelting of secondary aluminium

Putting the secondary aluminum into a smelting furnace, heating to 700-750 ℃, and smelting for 60-90min to melt the secondary aluminum into a melt;

step two: melt refining

After the secondary aluminum in the first step is melted into a melt, uniformly blowing 1.0-1.5 per thousand of granular refining agent into the melt by using a refining powder blower by using inert gas nitrogen as a carrier, standing for 10-20min, decomposing part of components in the refining agent at high temperature, reacting the generated gas with hydrogen, adsorbing slag inclusion, rapidly escaping from the melt, removing hydrogen and floating oxidation slag inclusion in the melt, and removing slag from other components in the refining agent to enable inclusions in the melt to float on the liquid level of the melt;

step three: aluminum ash transfer

Continuously standing the melt to enable the dross floating on the liquid surface of the melt to contain aluminum to generate a combustion reaction with the high-temperature melt, heating, monitoring the temperature of aluminum ash in the dross to 550-650 ℃ by using thermal imaging equipment, using an ash-removing rake to remove the aluminum ash out of a hearth, removing the aluminum ash into a transfer device, and transferring the aluminum ash into a rotary kiln by the transfer device;

step four: heating of aluminium ash

Heating the aluminum ash by using a combustion system at a cellar opening of the rotary cellar, and monitoring the temperature of the aluminum ash in the rotary cellar through thermal imaging equipment to enable the temperature to reach 800-;

step five: recovering aluminium liquid

After the design temperature is reached, starting the rotary kiln, carrying out rotary calcination to separate ash and aluminum in the aluminum ash, and then recovering the aluminum liquid;

step six: reuse of

Transferring the aluminum liquid recovered in the fifth step through a transfer device, and adding the aluminum liquid into the hearth of the casting furnace again in a liquid state for re-casting utilization.

The further improvement lies in that: in the first step, in the smelting process, a covering agent and a degasifier are added, and meanwhile, a smelting furnace is externally connected with a flue gas purification device to purify waste gas and smoke dust generated in the smelting process.

The further improvement lies in that: in the second step, the granular refining agent comprises the following components: 87.1 percent of sodium chloride, 6.8 percent of potassium chloride, 4.3 percent of sodium sulfate, 1.2 percent of silicon dioxide and 0.6 percent of nano-rod.

The further improvement lies in that: in the second step, 1.0-1.5 per mill of granular refining agent is uniformly blown into the melt, and then the mixed melt is stirred by an electromagnetic stirring system for 5-10 min.

The further improvement lies in that: and in the third step, placing the melt into a rotary kiln for standing, and heating to raise the temperature so as to burn the dross containing the aluminum and the high-temperature melt.

The further improvement lies in that: and in the fifth step, after the rotary kiln is started, stirring the aluminum ash in the rotary kiln by a stirring rake to control the combustion of the aluminum ash, controlling the temperature in the rotary kiln to be 800-900 ℃ by thermal imaging monitoring in the process, and stirring for 30-50 min to melt the aluminum in the aluminum ash into aluminum liquid, wherein the rest is ash.

The further improvement lies in that: and in the fifth step, after the aluminum liquid is recovered, transferring the residual ash in the rotary kiln to a cooling tank for cooling, pouring the ash into a magnetic separator after cooling, and adsorbing and recovering metal particles in the ash through the action of magnetic separation.

The invention has the beneficial effects that: the invention firstly smelts the secondary aluminum, and adds covering agent and degasifier, reduces burning loss, improves the recovery rate of aluminum and ensures the quality of aluminum, in the process, the smoke is purified by smoke purification equipment, the pollution is reduced, after smelting, the refining agent is sprayed into the melt by inert gas, and the refining reaction effect is better by matching with stirring, thereby optimizing the subsequent dross combustion and the recovery rate of aluminum ash by heating and separating out aluminum liquid, meanwhile, the metal particles in ash slag are recovered by a magnetic separator, the integral recovery utilization rate is improved, the waste is reduced, in addition, the aluminum liquid is added into the casting furnace again in a liquid state after being recovered, the casting is carried out again, and the combustion consumption of remelting after cooling and the discharge of pollutants are saved.

Detailed Description

In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

The embodiment provides a method for efficiently recovering secondary aluminum, which comprises the following steps:

the method comprises the following steps: smelting of secondary aluminium

Putting the secondary aluminum into a smelting furnace, heating to 750 ℃, smelting for 50min to melt the secondary aluminum into a melt, adding a covering agent and a degasifying agent in the smelting process, and simultaneously externally connecting the smelting furnace with flue gas purification equipment to purify waste gas and smoke dust generated in the smelting process;

step two: melt refining

After the secondary aluminum in the step one is melted into a melt, uniformly blowing 1.5 per thousand of granular refining agent into the melt by using a refining powder spraying machine and inert gas nitrogen as a carrier, wherein the granular refining agent comprises the following components: 87.1% of sodium chloride, 6.8% of potassium chloride, 4.3% of sodium sulfate, 1.2% of silicon dioxide and 0.6% of nano-rods, stirring the mixed melt by an electromagnetic stirring system for 10min, standing for 15min after stirring, decomposing part of components in the refining agent at high temperature, reacting generated gas with hydrogen, adsorbing slag inclusion, rapidly escaping from the melt, removing hydrogen and floating oxidation slag inclusion in the melt, and removing other components in the refining agent to ensure that impurities in the melt float on the melt level;

step three: aluminum ash transfer

Placing the melt into a rotary kiln for standing and heating, so that dross floating on the liquid surface of the melt and containing aluminum generates a combustion reaction with the high-temperature melt, heating, monitoring the temperature of aluminum ash in the dross to 600 ℃ by using thermal imaging equipment, using an ash raking rake to rake the aluminum ash out of a hearth, raking the aluminum ash into a transfer device, and transferring the aluminum ash into the rotary kiln by the transfer device;

step four: heating of aluminium ash

Heating the aluminum ash by using a combustion system at a kiln opening of the rotary kiln, and monitoring the temperature of the aluminum ash in the rotary kiln by using thermal imaging equipment to enable the temperature to reach 870 ℃;

step five: recovering aluminium liquid

Starting the rotary kiln to carry out rotary calcination after the design temperature is reached, stirring and controlling the combustion of the aluminum ash in the rotary kiln by the stirring rake, controlling the temperature in the rotary kiln at 900 ℃ in the process, stirring for 40min to melt the aluminum in the aluminum ash into aluminum liquid, separating the ash and the aluminum in the aluminum ash, then recovering the aluminum liquid, transferring the residual ash in the rotary kiln into a cooling tank for cooling, pouring the ash into a magnetic separator after cooling, and adsorbing and recovering metal particles in the ash through the action of magnetic separation;

step six: reuse of

Transferring the aluminum liquid recovered in the fifth step through a transfer device, and adding the aluminum liquid into the hearth of the casting furnace again in a liquid state for re-casting utilization.

The method for efficiently recovering the secondary aluminum comprises the steps of smelting the secondary aluminum, adding the covering agent and the degassing agent, reducing burning loss, improving the recovery rate of the aluminum and ensuring the quality of the aluminum, purifying the smoke through smoke purification equipment in the process, reducing pollution, spraying the refining agent into a melt through inert gas after smelting, and matching with stirring to ensure that the refining reaction effect is better, thereby optimizing the subsequent dross combustion and aluminum ash heating separation recovery rate of aluminum liquid, simultaneously recovering metal particles in ash through a magnetic separator, being beneficial to improving the overall recovery utilization rate and reducing waste, in addition, adding the aluminum liquid into a casting furnace again in a liquid state after recovering the aluminum liquid, re-casting, and being beneficial to saving the combustion loss and pollutant discharge of re-melting after cooling.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.