Method for curing heavy metals in copper tailings by using industrial waste carbide slag and kaolin

Abstract

The invention discloses a method for curing heavy metals in copper tailings by using industrial waste carbide slag and kaolin, which comprises the following steps: S1, drying, crushing and sieving theindustrial waste carbide slag to obtain calcium carbide powder, and drying, crushing and sieving the copper tailings to obtain copper tailing powder; S2, uniformly mixing calcium carbide powder and copper tailing powder according to a mass ratio of 0.15-0.25: 1 to obtain a mixture A; S3, adding NaOH into the water glass, uniformly stirring, regulating the modulus of the water glass to 1.2-1.8, and performing standing at normal temperature for 20-24 hours to obtain an alkali activator; S4, uniformly mixing the mixture A, an alkali activator and water according to a water-cement ratio of 0.2-0.4: 1 and a mass ratio of the mixture to the alkali activator of 100: 5-8 to obtain a mixture B; and S5, putting the mixture B into a mold, maintaining at 30-40 DEG C for 28 days, demolding, and performing standing at normal temperature for 24-28 hours to obtain the geopolymer. The method is simple to operate, the raw materials are cheap and easy to obtain, the curing cost of the copper tailings can be reduced, and the environmental pressure on the surrounding ecological environment caused by long-term stockpiling of the carbide slag and the copper tailings is relieved.

Description

Technical field

[0001] The present invention belongs to the technical field of solid waste recycling, particularly to a method of curing of Cu tailings with industrial waste carbide slag and kaolin. Background technique

[0002] With the continued socio-economic growth, the demand for copper ore have increased every year our country have a large number of copper mining and smelting was, which led to a large amount of copper tailings are discharged. According to "2019 China solid waste treatment industry analysis report" data show that emissions from copper tailings my country has reached 224 million tons / year. Our copper tailings discharged into the tailings are generally stored, along with copper tailings emissions continue to increase, there are at least ten thousand tailings on my country, the survey pointed out that our country is occupied by direct damage and tailings land up to 2 × 104km 2 , And the annual 200 ~ 300 km 2 The speed increase. Tailings large accumulation wil...

Examples

Embodiment 1

[0033] With calcium carbide sludge and industrial waste of copper tailings kaolin curing heavy metals, comprising the steps of:

[0034] Sl, industrial waste carbide slag dewatering to a moisture content of 20% and then dried 24h under vacuum at the temperature 100 ℃, crushed through a 200 mesh sieve to obtain powder electricity, kaolin dehydrated at 700 deg.] C to give metakaolin, copper tailings dried 15h under vacuum at the temperature 100 ℃, crushed through a 200 mesh sieve to obtain powder of copper tailings;

[0035] S2, the electrical powder, metakaolin, copper tailings powder mass ratio 0.15: 1 uniformly mixed to obtain mixture A;: 0.05

[0036] S3, and NaOH was added to stir the water glass, water glass modulus 1.2 modulation, and then allowed to stand at room temperature for 20 h, to give the alkali activator;

[0037] S4, the mixture A, the base and activator mixed water-cement ratio of 0.2: 1, the mixture ratio of the mass of the alkali activator is 100: 5 to obtain a ...

Embodiment 2

[0040] With calcium carbide sludge and industrial waste of copper tailings kaolin curing heavy metals, comprising the steps of:

[0041] Sl, industrial waste water content of carbide slag dewatered to 30%, and then dried 30h under vacuum at the temperature 110 ℃, crushed through 300 mesh sieve to obtain powder electricity, kaolin dehydrated at 800 deg.] C to give metakaolin, copper tailings dried 18h ​​under vacuum at the temperature 110 ℃, crushed through 300 mesh sieve to obtain powder of copper tailings;

[0042] S2, the electrical powder, metakaolin, copper tailings powder mass ratio 0.25: 1 uniformly mixed to obtain mixture A;: 0.1

[0043] S3, and NaOH was added to stir the water glass, water glass modulus 1.8 modulation, and then allowed to stand at room temperature 24h, to give the alkali activator;

[0044] S4, the mixture A, the base and activator mixed water-cement ratio of 0.4: 1, the mixture mass ratio of the alkali activator is 100: 8 to obtain a mixture B;

[0045] ...

Embodiment 3

[0047] With calcium carbide sludge and industrial waste of copper tailings kaolin curing heavy metals, comprising the steps of:

[0048] Sl, industrial waste carbide slag dewatering to a moisture rate of 25%, and then dried 27h under vacuum at a temperature of 105 ℃, after passing through a 250 mesh sieve to obtain pulverized powder electricity, kaolin dehydrated at 750 deg.] C to give metakaolin, copper tailings 16.5h dried under vacuum at a temperature of 105 ℃, crushed through 250 mesh sieve to obtain powder of copper tailings;

[0049] S2, the electrical powder, metakaolin, copper tailings powder mass ratio 0.2: 1 uniformly mixed to obtain mixture A;: 0.075

[0050] S3, and NaOH was added to stir the water glass, water glass modulus 1.5 modulation, and then allowed to stand for 22h at room temperature, to obtain an alkali activator;

[0051] S4, the mixture A, the base and activator mixed water-cement ratio of 0.3: 1, the mixture ratio of the mass of the alkali activator is 10...

Technical field

[0001] The present invention belongs to the technical field of solid waste recycling, particularly to a method of curing of Cu tailings with industrial waste carbide slag and kaolin. Background technique

[0002] With the continued socio-economic growth, the demand for copper ore have increased every year our country have a large number of copper mining and smelting was, which led to a large amount of copper tailings are discharged. According to "2019 China solid waste treatment industry analysis report" data show that emissions from copper tailings my country has reached 224 million tons / year. Our copper tailings discharged into the tailings are generally stored, along with copper tailings emissions continue to increase, there are at least ten thousand tailings on my country, the survey pointed out that our country is occupied by direct damage and tailings land up to 2 × 104km 2 , And the annual 200 ~ 300 km 2 The speed increase. Tailings large accumulation wil...

Examples

Embodiment 1

[0033] With calcium carbide sludge and industrial waste of copper tailings kaolin curing heavy metals, comprising the steps of:

[0034] Sl, industrial waste carbide slag dewatering to a moisture content of 20% and then dried 24h under vacuum at the temperature 100 ℃, crushed through a 200 mesh sieve to obtain powder electricity, kaolin dehydrated at 700 deg.] C to give metakaolin, copper tailings dried 15h under vacuum at the temperature 100 ℃, crushed through a 200 mesh sieve to obtain powder of copper tailings;

[0035] S2, the electrical powder, metakaolin, copper tailings powder mass ratio 0.15: 1 uniformly mixed to obtain mixture A;: 0.05

[0036] S3, and NaOH was added to stir the water glass, water glass modulus 1.2 modulation, and then allowed to stand at room temperature for 20 h, to give the alkali activator;

[0037] S4, the mixture A, the base and activator mixed water-cement ratio of 0.2: 1, the mixture ratio of the mass of the alkali activator is 100: 5 to obtain a ...

Embodiment 2

[0040] With calcium carbide sludge and industrial waste of copper tailings kaolin curing heavy metals, comprising the steps of:

[0041] Sl, industrial waste water content of carbide slag dewatered to 30%, and then dried 30h under vacuum at the temperature 110 ℃, crushed through 300 mesh sieve to obtain powder electricity, kaolin dehydrated at 800 deg.] C to give metakaolin, copper tailings dried 18h ​​under vacuum at the temperature 110 ℃, crushed through 300 mesh sieve to obtain powder of copper tailings;

[0042] S2, the electrical powder, metakaolin, copper tailings powder mass ratio 0.25: 1 uniformly mixed to obtain mixture A;: 0.1

[0043] S3, and NaOH was added to stir the water glass, water glass modulus 1.8 modulation, and then allowed to stand at room temperature 24h, to give the alkali activator;

[0044] S4, the mixture A, the base and activator mixed water-cement ratio of 0.4: 1, the mixture mass ratio of the alkali activator is 100: 8 to obtain a mixture B;

[0045] ...

Embodiment 3

[0047] With calcium carbide sludge and industrial waste of copper tailings kaolin curing heavy metals, comprising the steps of:

[0048] Sl, industrial waste carbide slag dewatering to a moisture rate of 25%, and then dried 27h under vacuum at a temperature of 105 ℃, after passing through a 250 mesh sieve to obtain pulverized powder electricity, kaolin dehydrated at 750 deg.] C to give metakaolin, copper tailings 16.5h dried under vacuum at a temperature of 105 ℃, crushed through 250 mesh sieve to obtain powder of copper tailings;

[0049] S2, the electrical powder, metakaolin, copper tailings powder mass ratio 0.2: 1 uniformly mixed to obtain mixture A;: 0.075

[0050] S3, and NaOH was added to stir the water glass, water glass modulus 1.5 modulation, and then allowed to stand for 22h at room temperature, to obtain an alkali activator;

[0051] S4, the mixture A, the base and activator mixed water-cement ratio of 0.3: 1, the mixture ratio of the mass of the alkali activator is 10...

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