阅读说明：本技术 一种机制砂二段湿法除云母工艺 (Two-stage wet mica removing process for machine-made sand ) 是由 金雯雯 陈炳金 夏忠勇 陈桂木 于 2021-07-19 设计创作，主要内容包括：本发明公开了一种机制砂二段湿法除云母工艺,涉及砂石生产领域,包括调浆工序、第一次磁选工序、第二次磁选工序、洗砂工序、浓缩工序和过滤工序。与现有技术相比,本发明的有益效果为：本发明采用湿法工艺,无粉尘污染；本发明采用二段磁选去除多余云母,与传统工艺相比,除云母效果好；本发明可以得到副产品云母,用于其它用途；对于含铁矿物较高的砂子,还可回收含铁矿物。(The invention discloses a two-stage wet mica removing process for machine-made sand, which relates to the field of sand production and comprises a slurry mixing procedure, a first magnetic separation procedure, a second magnetic separation procedure, a sand washing procedure, a concentration procedure and a filtering procedure. Compared with the prior art, the invention has the beneficial effects that: the invention adopts a wet process, and has no dust pollution; the method adopts two-stage magnetic separation to remove the redundant mica, and compared with the traditional process, the method has good mica removing effect; the invention can obtain byproduct mica for other purposes; for sand with high iron-containing minerals, the iron-containing minerals can also be recovered.)

1. A two-stage wet mica removing process for machine-made sand is characterized in that: the method comprises the following steps:

step one, a size mixing procedure: fully mixing the raw material sand with water to obtain a mixed product a;

step two, a first magnetic separation process: carrying out magnetic separation on the product a obtained in the step one through first magnetic separation equipment to obtain a product b adsorbed by the magnetic separation equipment and a product c not adsorbed by the magnetic separation equipment;

step three, a second magnetic separation process: carrying out magnetic separation on the product b obtained in the step two through second magnetic separation equipment to obtain a product d adsorbed by the magnetic separation equipment and a product e not adsorbed by the magnetic separation equipment;

step four, a sand washing procedure: washing sand of the product d obtained in the step three through sand washing equipment to obtain sand f and waste water g after mica removal;

step five, a concentration process: concentrating the product c obtained in the step two through concentration and dehydration equipment to obtain concentrated ore pulp h and wastewater i;

step six, a filtering process: and D, filtering the concentrated ore pulp h obtained in the step five through a filtering device to obtain mica j and wastewater k.

2. The machine-made sand two-stage wet mica removing process according to claim 1, which is characterized in that: the water content percentage of the product a in the first step is 40-90%.

3. The machine-made sand two-stage wet mica removing process according to claim 1, which is characterized in that: in the second step, the first magnetic separation equipment is one or more of a wet-type cylinder magnetic separator, a wet-type disc magnetic separator, a flat magnetic separator and a vertical ring high-gradient magnetic separator; the magnetic field intensity of the first magnetic separation equipment is 2500-15000 Gs.

4. The machine-made sand two-stage wet mica removing process according to claim 1, which is characterized in that: in the third step, the second magnetic separation equipment is one or more of a wet-type cylinder magnetic separator, a wet-type disc magnetic separator, a flat magnetic separator and a vertical ring high-gradient magnetic separator; and the magnetic field intensity of the secondary magnetic separation equipment is 3000-15000 Gs.

5. The machine-made sand two-stage wet mica removing process according to claim 1, which is characterized in that: and in the fourth step, the sand washing equipment is one or more of a sand washing machine, a sieve, a hydrocyclone and a spiral classifier.

6. The machine-made sand two-stage wet mica removing process according to claim 1, which is characterized in that: and in the fifth step, the concentration and dehydration equipment is one or two of a thickener and a concentration tank.

7. The machine-made sand two-stage wet mica removing process according to claim 1, which is characterized in that: adding 2-50 g of flocculating agent per ton in the fifth step according to the weight of the solid; the water content of the concentrated ore pulp h is not more than 55 percent by mass.

8. The machine-made sand two-stage wet mica removing process according to claim 1, which is characterized in that: in the sixth step, the filtering equipment is one or two of a filter press, a disk mountain type vacuum filter, a belt type vacuum filter and a ceramic filter.

Technical Field

The invention relates to the field of sandstone production, in particular to a two-stage wet mica removing process for machine-made sand.

Background

With the development of the sandstone industry, the production of machine-made sand by using granite is an important production mode. However, part of the granite contains more mica, and the machine-made sand produced by the granite is easy to cause the mica to exceed the standard, so that the product is unqualified. The traditional dry method for removing mica can cause dust pollution to the environment, and the traditional wet method technology for removing mica by washing with water only can remove a small part of mica floating on the water surface, so that the effect is limited. Therefore, a new wet mica removal process is needed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a two-stage wet mica removing process for machine-made sand, which has the advantages of good mica removing effect and high production efficiency.

The purpose of the invention is achieved by the following technical scheme: the two-stage wet mica removing process for machine-made sand comprises the following steps:

step one, a size mixing procedure: fully mixing the raw material sand with water to obtain a mixed product a;

step two, a first magnetic separation process: carrying out magnetic separation on the product a obtained in the step one through first magnetic separation equipment to obtain a product b adsorbed by the magnetic separation equipment and a product c not adsorbed by the magnetic separation equipment;

step three, a second magnetic separation process: carrying out magnetic separation on the product b obtained in the step two through second magnetic separation equipment to obtain a product d adsorbed by the magnetic separation equipment and a product e not adsorbed by the magnetic separation equipment;

step four, a sand washing procedure: washing sand of the product d obtained in the step three through sand washing equipment to obtain sand f and waste water g after mica removal;

step five, a concentration process: concentrating the product c obtained in the step two through concentration and dehydration equipment to obtain concentrated ore pulp h and wastewater i;

step six, a filtering process: and D, filtering the concentrated ore pulp h obtained in the step five through a filtering device to obtain mica j and wastewater k.

As a preferable technical scheme, the water content percentage of the product a in the step one is 40-90%.

As a preferable technical scheme, in the second step, the first magnetic separation equipment is one or more of a wet-type cylinder magnetic separator, a wet-type disc magnetic separator, a flat-plate magnetic separator and a vertical-ring high-gradient magnetic separator; the magnetic field intensity of the first magnetic separation equipment is 2500-15000 Gs.

As a preferable technical scheme, in the third step, the second magnetic separation equipment is one or more of a wet-type cylinder magnetic separator, a wet-type disc magnetic separator, a flat-plate magnetic separator and a vertical-ring high-gradient magnetic separator; and the magnetic field intensity of the secondary magnetic separation equipment is 3000-15000 Gs.

As a preferable technical scheme, the sand washing equipment in the fourth step is one or more of a sand washing machine, a sieve, a hydrocyclone and a spiral classifier.

As a preferable technical scheme, the concentration and dehydration equipment in the step five is one or two of a thickener and a concentration tank.

As a preferable technical scheme, 2-50 g of flocculant is added to each ton in the fifth step according to the weight of solids; the water content of the concentrated ore pulp h is not more than 55 percent by mass.

As a preferable technical scheme, the filtering equipment in the sixth step is one or two of a filter press, a spiral hill type vacuum filter, a belt type vacuum filter and a ceramic filter.

The invention has the beneficial effects that:

1. the invention adopts a wet process, and has no dust pollution;

2. the method adopts two-stage magnetic separation to remove the redundant mica, and compared with the traditional process, the method has good mica removing effect;

3. the invention can obtain byproduct mica for other purposes; for sand with high iron-containing minerals, the iron-containing minerals can also be recovered.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The invention will be described in detail below with reference to the following drawings:

example 1: a two-stage wet mica removing process for machine-made sand comprises the following steps:

step one, a size mixing procedure: fully mixing the raw material sand with water to obtain a mixed product a, wherein the water content of the product a is 60% by weight;

step two, a first magnetic separation process: carrying out magnetic separation on the product a obtained in the step one by a wet drum magnetic separator with the magnetic field intensity of 3500Gs to obtain a product b adsorbed by magnetic separation equipment and a product c not adsorbed by the magnetic separation equipment;

step three, a second magnetic separation process: carrying out magnetic separation on the product b obtained in the step two by a wet type drum magnetic separator with the magnetic field intensity of 4500Gs to obtain a product d adsorbed by magnetic separation equipment and a product e not adsorbed by the magnetic separation equipment;

step four, a sand washing procedure: washing sand of the product d obtained in the step three by a wheel type sand washer to obtain sand f and waste water g after mica removal;

step five, a concentration process: concentrating the product c obtained in the step two by a thickener, and adding 28g of flocculant into each ton of the product c according to the weight of solid during concentration; obtaining concentrated ore pulp h and waste water i with the water mass fraction of 47%;

step six, a filtering process: and (4) filtering the concentrated ore pulp h obtained in the fifth step by using a spiral hill type vacuum filter to obtain mica j and wastewater k.

This example can reduce the weight percent of mica in the raw material-containing sand from 5% to 0.8%.

Example 2: a two-stage wet mica removing process for machine-made sand comprises the following steps:

step one, a size mixing procedure: fully mixing the raw material sand with water to obtain a mixed product a, wherein the water content of the product a is 55% by weight;

step two, a first magnetic separation process: carrying out magnetic separation on the product a obtained in the step one by a wet type cylinder magnetic separator with the magnetic field intensity of 3000Gs to obtain a product b adsorbed by magnetic separation equipment and a product c not adsorbed by the magnetic separation equipment;

step three, a second magnetic separation process: carrying out magnetic separation on the product b obtained in the step two by a wet drum magnetic separator with the magnetic field intensity of 5500Gs to obtain a product d adsorbed by magnetic separation equipment and a product e not adsorbed by the magnetic separation equipment;

step four, a sand washing procedure: washing sand from the product d obtained in the step three through a sieve to obtain sand f and waste water g after mica removal;

step five, a concentration process: concentrating the product c obtained in the step two by a thickener, and adding 25g of flocculant into each ton of the product c according to the weight of solid during concentration; obtaining concentrated ore pulp h with water content of 52% and waste water i;

step six, a filtering process: and (4) filtering the concentrated ore pulp h obtained in the fifth step by using a spiral hill type vacuum filter to obtain mica j and wastewater k.

This example can reduce the mica weight percentage in the raw material-containing sand from 3.5% to 0.45%.

Example 3: a two-stage wet mica removing process for machine-made sand comprises the following steps:

step one, a size mixing procedure: fully mixing the raw material sand with water to obtain a mixed product a, wherein the water content of the product a is 55% by weight;

step two, a first magnetic separation process: carrying out magnetic separation on the product a obtained in the step one by a wet type cylinder magnetic separator with the magnetic field intensity of 2800Gs to obtain a product b adsorbed by magnetic separation equipment and a product c not adsorbed by the magnetic separation equipment;

step three, a second magnetic separation process: carrying out magnetic separation on the product b obtained in the step two by a vertical ring high gradient magnetic separator with the magnetic field intensity of 4000Gs to obtain a product d adsorbed by magnetic separation equipment and a product e not adsorbed by the magnetic separation equipment;

step four, a sand washing procedure: washing sand of the product d obtained in the step three by a wheel type sand washer to obtain sand f and waste water g after mica removal;

step five, a concentration process: concentrating the product c obtained in the step two by a thickener, and adding 35g of flocculant into each ton of the product c according to the weight of solid during concentration; obtaining concentrated ore pulp h and waste water i with the water content of 43 percent by mass;

step six, a filtering process: and (4) filtering the concentrated ore pulp h obtained in the fifth step through a belt type vacuum filter to obtain mica j and wastewater k.

This example can reduce the weight percent of mica in the raw sand from 3.8% to 0.51%.

Example 4: a two-stage wet mica removing process for machine-made sand comprises the following steps:

step one, a size mixing procedure: fully mixing the raw material sand with water to obtain a mixed product a, wherein the water content of the product a is 60% by weight;

step two, a first magnetic separation process: carrying out magnetic separation on the product a obtained in the step one by a vertical ring high gradient magnetic separator with the magnetic field intensity of 3000Gs to obtain a product b adsorbed by magnetic separation equipment and a product c not adsorbed by the magnetic separation equipment;

step three, a second magnetic separation process: carrying out magnetic separation on the product b obtained in the step two by a vertical ring high gradient magnetic separator with the magnetic field intensity of 6000Gs to obtain a product d adsorbed by magnetic separation equipment and a product e not adsorbed by the magnetic separation equipment;

step four, a sand washing procedure: washing sand of the product d obtained in the step three by a wheel type sand washer to obtain sand f and waste water g after mica removal;

step five, a concentration process: concentrating the product c obtained in the step two by a thickener, and adding 40g of flocculant into each ton of the product c according to the weight of solid during concentration; obtaining concentrated ore pulp h and waste water i with the water content of 50 percent by mass;

step six, a filtering process: and (4) filtering the concentrated ore pulp h obtained in the fifth step by using a spiral hill type vacuum filter to obtain mica j and wastewater k.

This example can reduce the mica weight percentage in the raw material-containing sand from 6% to 0.3%.

Example 5: a two-stage wet mica removing process for machine-made sand comprises the following steps:

step one, a size mixing procedure: fully mixing the raw material sand with water to obtain a mixed product a, wherein the water content of the product a is 75% by weight;

step two, a first magnetic separation process: carrying out magnetic separation on the product a obtained in the step one by a wet drum magnetic separator with the magnetic field intensity of 4500Gs to obtain a product b adsorbed by magnetic separation equipment and a product c not adsorbed by the magnetic separation equipment;

step three, a second magnetic separation process: carrying out magnetic separation on the product b obtained in the step two by a wet type cylinder magnetic separator with the magnetic field intensity of 6000Gs to obtain a product d adsorbed by magnetic separation equipment and a product e not adsorbed by the magnetic separation equipment;

step four, a sand washing procedure: washing sand of the product d obtained in the step three by a wheel type sand washer to obtain sand f and waste water g after mica removal;

step five, a concentration process: concentrating the product c obtained in the step two by a thickener, and adding 35g of flocculant into each ton of the product c according to the weight of solid during concentration; obtaining concentrated ore pulp h with water content of 44% and waste water i;

step six, a filtering process: and (4) filtering the concentrated ore pulp h obtained in the fifth step through a ceramic vacuum filter to obtain mica j and wastewater k.

This example can reduce the mica weight percentage in the raw material-containing sand from 4.1% to 0.23%.

Example 6: a two-stage wet mica removing process for machine-made sand comprises the following steps:

step one, a size mixing procedure: fully mixing the raw material sand with water to obtain a mixed product a, wherein the water content of the product a is 65% by weight;

step two, a first magnetic separation process: carrying out magnetic separation on the product a obtained in the step one by a wet drum magnetic separator with the magnetic field intensity of 4500Gs to obtain a product b adsorbed by magnetic separation equipment and a product c not adsorbed by the magnetic separation equipment;

step three, a second magnetic separation process: carrying out magnetic separation on the product b obtained in the step two by a wet disc type magnetic separator with the magnetic field intensity of 6000Gs to obtain a product d adsorbed by magnetic separation equipment and a product e not adsorbed by the magnetic separation equipment;

step four, a sand washing procedure: washing sand of the product d obtained in the step three by a spiral classifier to obtain sand f and waste water g after mica removal;

step five, a concentration process: concentrating the product c obtained in the step two by a thickener, and adding 43g of flocculant per ton of solid weight during concentration; obtaining concentrated ore pulp h with water content of 40% and waste water i;

step six, a filtering process: and (4) filtering the concentrated ore pulp h obtained in the fifth step through a belt type vacuum filter to obtain mica j and wastewater k.

This example can reduce the weight percent of mica in the raw sand from 2.4% to 0.12%.

It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.