CN112844817B - Efficient high-quality beneficiation method combining gravity separation and screening by using spiral beneficiation equipment - Google Patents

Abstract

The invention relates to a high-efficiency and high-quality beneficiation method using spiral beneficiation equipment for gravity separation and screening, belonging to the technical field of beneficiation. The discharge end of the beneficiation equipment is equally divided into multiple strands, and the pulp is first separated. If there are pulp strands near the inner edge of the chute that have reached the separation standard, they are drawn out during production and not screened. If they do not meet the separation standard, they are retained. The pulp stocks to be screened are merged into one group from the inside to the outside, and each group of pulp is screened with a production sieve. If the production sieve of the first group is T mesh, the subsequent groups will increase the F mesh in turn. . After testing, the ore pulp group that does not meet the separation standard, the screened and unscreened materials are combined respectively, and then sent to the beneficiation equipment for separation by this method. Separation results. The parameters M, T, F are determined by experiments and calculations. The method of the invention can significantly improve the separation efficiency and quality of the spiral beneficiation equipment, and expand the scope of application.

Description

High-efficiency and high-quality beneficiation method using spiral beneficiation equipment for combined gravity screening and screening

technical field

The invention belongs to the technical field of mineral processing.

Background technique

Spiral chute and spiral concentrator are generally called spiral concentrator. The patent number is ZL201710313231.1, and the name "is a method for re-selection of multiple layers, zoning-screening" is the prior art, and the mineral must be ground to a particle size of not more than 0.074mm (quite not less than 200 mm). 80%-90% of the ore material of the mesh), after dividing the output of the gravity separation equipment into multiple strands, each strand must be screened separately, and the strands of each strand should be screened in order from heavy to light. The mesh spacing must all be a fixed 25 mesh. Using this method for mineral separation and sorting, its efficiency, quality and adaptability to minerals need to be improved.

SUMMARY OF THE INVENTION

The standard of the present invention is to overcome the shortcomings of the prior art and provide a high-efficiency and high-quality beneficiation method using a spiral beneficiation equipment for gravity separation and screening combined

The method of the present invention is:

1. Divide the spiral concentrator with the discharge pipe closed, or the discharge end of the spiral chute into multiple strands, and the width of each strand is 1.25%-5.0% of the width of the discharge end. It is best to use a spiral beneficiation equipment with a diameter of not less than 60 cm and a spiral groove number of 6-21.

The mineral material to be separated is ground into fine particles with a sieve mesh number of N. For each specific mineral material, the method of determining the value of N is the prior art known to those skilled in the art. The slurry concentration is preferably 6%-12% by volume of solid and liquid.

2. When using this method for production and separation, it is assumed that the minerals are composed of A and B, and A and B can each be one or more minerals. According to the condition of the original ore and the requirements of subsequent processing, determine the A and/or in the material obtained after separation. A certain content of B is used as the separation standard. The determination of separation standards is within the grasp of professional and technical personnel. First, use the spiral beneficiation equipment to separate the pulp once, and test each strand of pulp in the feeding chute. If one or more strands of pulp near the inner edge of the chute have reached the separation standard, the subsequent production will lead out these strands of pulp as The separation result will not be screened. If the separation standard is not met, the pulp strands will be retained; the pulp strands that do not meet the separation standard will be screened, and the pulp strands to be screened will be screened from the inner edge of the chute outwards for every continuous M strands. Combined into one group to get group 1, group 2, group 3, ..., but the number of pulp strands in the last group combined can be equal to or less than M; each group of pulp is then screened with a production screen by If the production sieve of group 1 is T mesh, the production sieve of group 2 is T+F mesh, the production sieve of group 3 is T+2F mesh, the production sieve of group 4 is T+3F mesh, and so on By analogy; after each group of pulp is screened, the screened and unscreened materials are tested again. For the pulp group that does not meet the separation standard, the screened and unscreened materials are combined respectively, and then sent to the spiral beneficiation equipment. According to the method of the invention, separation is carried out, and the materials of each group that meet the separation standard are respectively combined according to sieving and non-sieving to obtain separation results.

3. The number of shares M of each group of pulp should be combined during production, the mesh number T of the first group of pulp to be screened, and the incremental mesh number F of each production sieve are determined by experiments and calculations. The methods are:

Prepare a series of test sieves in advance, with 30 meshes as the first level, then the number of sieves of each level of test sieves is increased by 1 mesh, the next level, namely the second level test sieve, is 31 meshes, and the third level test sieve is 32 meshes. Mesh, ..., the last level is 1000 mesh.

The pulp is continuously fed into the feeding end of the spiral beneficiation equipment with the same specifications as used in production for separation, and each group of pulp obtained at the discharge end is tested. If one or more pulps close to the inner edge of the chute reach the separation standard These pulp strands are then not used, and if the separation criteria are not met, these pulp strands are then still used. Next, the 1st strand from the inner edge of the chute of the pulp strands still to be used is passed through a test sieve with a mesh number of N+1. If the material obtained after sieving does not meet the separation standard, this method cannot be used. If the separation standard can be reached, the pulp stock will be passed through multiple test sieves of the next stage, the next stage, and so on. When the material sieved by a test sieve with a mesh number of D does not meet the separation standard, the parameter R=D-(N+1),

The incremental mesh number F of each production sieve is:

When R=10-30, F=100%R;

When R=31-50, F=(90%-100%) the rounded integer of the value of R;

When R=51-70, F=(60%-100%) the rounded integer of the value of R;

When R=71-90, F=(50%-100%) the rounded integer of the value of R;

When R=91-110, F=(40%-100%) the rounded integer of the value of R;

When R≥111, F=(35%-100%) the rounded integer of the value of R;

The mesh number of the first group of pulp to be screened during production T=N+F

Then pass the 1st strand from the inner edge of the pulp strands still to be used through the sieve with the mesh number of T. If the material sieved by the test sieve reaches the separation standard, the 1st strand from the inner edge of the chute shall be screened. The 1st and 2nd pulps are combined, and then sieved through a sieve with a mesh number of T, ... until the material sieved by the test sieve does not meet the separation standard, then the number of shares merged through the sieve minus 1 is the production When the number of shares M should be consolidated.

The slurry flow during production must be the same as when M, T, F are determined.

Compared with the prior art, the essential feature in the mechanism of the present invention is that the crystal system, crystal type, crystal shape, density, ductility, hardness, brittleness, cleavage, dissociation shape, fracture shape and particle size of minerals are fully utilized. The mineral separation combined with gravity screening and screening is carried out according to the effect of various characteristics on the sedimentation velocity. The discharge end of the spiral beneficiation equipment is equally divided into multiple strands, and after various parameters are determined according to the method of the present invention, the pulp is re-selected, and the pulp strands are combined and grouped for screening, so that the pulp strands that have reached the separation standard can be accurately connected. Accurately determine the number of merged pulp stocks that do not meet the separation standard and the number of screening meshes of each group of pulp to achieve high-efficiency and high-quality beneficiation. In addition, the spiral groove number of the spiral concentrator is more than the conventional one, so that the different particles of the pulp can obtain sufficient free settling time when flowing through the spiral concentrator or the spiral chute. Compared with the conventional method, the present invention reduces the concentration of the ore pulp and can reduce the viscosity between the mineral particles, so that different particles in the ore pulp can obtain enough free settling space when flowing through the spiral concentrator or the spiral chute, so that the mineral particles on the groove surface are more stable. The laminar flow is realized in a wide range, and the turbulent flow area near the outer edge is reduced, so that the discharge end of the spiral beneficiation equipment can be arranged in an orderly manner according to the difference in the ratio of the density to the surface area of different mineral particles.

Compared with the prior art, the invention has the beneficial effects of significantly improving the separation efficiency and quality of the spiral beneficiation equipment and expanding the applicable scope. The present invention provides an unprecedented new method for the separation of minerals.

Detailed ways

The contents described in the following examples, unless otherwise specified, are all weight percent contents.

Example 1

The minerals to be separated are laterite-type weathered crust nickel ore, containing 1.2% nickel and 15% iron. The mine is mainly composed of nickel-bearing limonite minerals and olivine minerals, with olivine minerals accounting for 60%. Nickel-bearing limonite consists of lamellar and scaly goethite and amorphous iron oxide. Nickel-containing limonite has a hardness of 1-4.3 and a density of 3.0-4.0g/cm ³ . The hardness of olivine mineral is 6.5-7 and the density is 3.2-4.4g/cm ³ .

The separation requirement of this Example 1 is to separate the olivine minerals from the nickel-containing limonite minerals. The separation standard is achieved when the proportion of nickel-containing limonite minerals or the proportion of olivine minerals in the obtained material is greater than 90%.

Use a spiral chute with a diameter of 60 cm and a spiral groove with 8 turns. Divide the cutter and the receiving chute fastened at the discharge end of the spiral chute into 20 strands with a width of 1.4 cm, and the width of each strand is 5% of the width of the discharge end.

The ore to be separated is ground into fine particles with a sieve mesh number of 150, and the ore pulp with a solid-liquid volume percentage of 10% is prepared.

The pulp is continuously fed into the feed port of the spiral concentrator at a flow rate of 0.75L/s for separation. Tests showed that the olivine mineral content of the 6 strands of pulp in the receiving trough near the inner edge of the chute was greater than 90%, and the 6 strands of pulp to achieve separation criteria were not subsequently used. Pass the 1 stock immediately after it (that is, the 7th stock counting from the inner edge of the chute outwards in the receiving chute) pulp through a test sieve with a mesh number of 150+1=151. The amount of nickel-containing limonite minerals is greater than 90%, and then the pulp is passed through a test sieve with a mesh number of 152. At this time, the amount of nickel-containing limonite minerals in the fine particles that have not passed the sieve is still greater than 90%, and then the pulp is passed through the mesh. The test sieve with the number of 153, ..., when the test sieve with the mesh number of D=265 is passed, it is found that the amount of nickel-containing limonite minerals in the fine particles on the sieve surface is not more than 90%, then R=D-(N +1)=265-(150+1)=114.

Take the value of the incremental mesh number F of each production sieve in the future as 114×50%=57.

Take the sieve number T=150+57=207 of the first group of pulp during production.

At this time, the 1st strand (that is, the 7th strand at the discharge end) to be used in the feeding chute is passed through a test sieve with a mesh number of 207, and it is found that the obtained material meets the separation standard. The 7th and 8th ore pulps from the slug were combined, and then passed through the test sieve with a mesh number of 207. It was found that the obtained material still reached the separation standard. The 9 strands of pulp were combined, and then passed through a test screen with a mesh number of 207. It was found that the material obtained at this time could not meet the separation standard. Therefore, it was determined that the number of strands to be combined for each group of pulp during production was M=3-1=2.

During production, the pulp flow rate is 0.75L/s. After being separated by the spiral beneficiation equipment for the first time, the inspection of each strand of ore pulp in the feeding tank showed that the amount of olivine minerals in the 6 strands near the innermost edge of the chute in the slurry of the feeding trough was greater than 90%. In the subsequent production process, All lead to the above-mentioned 6 strands of pulp that have achieved separation standards discarded. In the remaining pulp strands, each consecutive 2 strands of pulp are combined into one group, which are recorded as the first group, the second group, the third group, the fourth group, ..., the seventh group. The first group was screened with 207 mesh, and then the mesh number of each group of pulp screening was increased by 57 in turn. After each group of ore pulps were screened, it was found that the content of nickel-containing limonite minerals in the solids on all sieve surfaces of groups 1-6 was greater than 90%, so the solids on these sieve surfaces were combined as concentrates; One group does not meet the separation standard, so the sieved and unscreened materials in this group are drawn out respectively and then sent to the spiral beneficiation equipment for separation by the method of the present invention.

After sorting in Example 1, the nickel content in the obtained concentrate was 2.65%, and the iron content was 33.1%. As a scientific research and test, the same laterite-type weathered nickel ore was sorted by the prior art method recorded in the document with the patent number ZL201710313231.1, and the mesh number of each material sorted in order from heavy to light was used for screening. The spacing is 25 meshes. The comparison result is that even if it is screened three times according to the prior art, the nickel content in the obtained concentrate is not more than 1.9%, and the iron content is not more than 23.75%. .

Example 2

The minerals to be separated are the intermediate raw materials for the production of chemical barite in a factory. The grinding particle size is 170 mesh sieve. After grinding, dissociated sphalerite accounted for 13.5%, wombite minerals accounted for 5.5%, and barite minerals accounted for 81%. The hardness of barite minerals is 3.0-3.5, the density is 4.3-4.5g/cm ³ , orthorhombic, and the crystal form is plate-like and granular. Sphalerite has a density of 3.9-4.2g/cm ³ , a hardness of 3.0-4.5, an equiaxed crystal system, a hexatetrahedral crystal type, and a granular crystal form. The wombatite mineral contains 54.15% barium oxide and 44.13% silicon dioxide. Wormite has a hardness of 5.5, a density of 3.7g/cm ³ , an orthorhombic crystal system, and the crystal form is plate-like and flake-like.

The separation requirement of this embodiment 2 is to separate barite from sphalerite and wombite minerals. When the amount of barite in the resultant is more than 95%, the separation standard is reached.

Use a spiral chute with a diameter of 120 cm and a spiral groove with 19 turns. Divide the cutter and the receiving chute fastened at the discharge end of the spiral chute into 80 strands with a width of 0.7 cm, and each share is 1.25% of the width of the discharge end.

The material was made into a slurry with a solid-liquid volume percentage of 7%.

The slurry was continuously fed into the feed port of the spiral concentrator at a flow rate of 1.2L/s for separation. Testing showed that the total amount of barite minerals in the 7 strands of slurries near the inner edge of the chute in the receiving chute was greater than 95%, and these 7 strands of slurries were not subsequently used. Pass the next 1st strand (that is, the 8th strand from the inner edge of the chute outwards in the receiving chute) through a test sieve with a mesh number of 171. At this time, the amount of barite minerals passing through the sieve is greater than 95%. , and then pass the pulp through a test sieve with a mesh number of 172. At this time, the amount of barite minerals passing through the sieve is still greater than 95%, and then pass the pulp through a test sieve with a mesh number of 173, ..., when the mesh number D is 194 When the test sieve was used, it was found that the obtained material could not reach the separation standard, so R=D-(N+1)=194-(170+1)=23.

The incremental mesh number of each production sieve is F=100%×23=23.

The mesh number T=170+23=193 for screening the first group of pulp during production.

Pass the 1st strand from the inner edge of the pulp strands to be used in the discharge end of the chute (that is, the 8th strand from the outer edge of the chute in the receiving chute) through a sieve with a mesh number of 193, and find that the The material can reach the separation standard, so the first and second strands from the inner edge of the pulp strands to be used in the discharge end of the chute (that is, the 8th and 9th strands in the receiving chute counted from the inner edge of the chute outwards) Stocks) were combined, and then sieved through a sieve with a mesh number of 193. It was found that the obtained material reached the separation standard. Therefore, the first, second and third strands counted from the inner edge of the pulp stocks to be used in the discharge end of the chute were separated. (that is, the 8th, 9th and 10th strands counted from the inner edge of the chute outwards in the receiving trough) are combined, and then sieved through a sieve with a mesh number of 193. At this time, it is found that the obtained material cannot meet the separation standard, then the production should be The number of combined shares M=3-1=2.

Production: As mentioned above, the separation requirement is to separate the barite from the sphalerite and wombite minerals. The separation criterion is achieved when the amount of barite in the result is greater than 98%.

The pulp flow rate was 1.2L/s. After being separated by the spiral beneficiation equipment for the first time, the inspection of each strand of ore pulp in the feeding chute showed that the 7 strands of the pulp in the feeding chute near the innermost edge of the chute found that the obtained material had reached the separation standard, so in the subsequent production process, all The above 7 strands are drawn out without sieving. In the remaining pulp, each continuous 2 strands of pulp are combined into one group, which are recorded as the first group, the second group, the third group, ..., the 36th group, and the last group has only one strand, a total of 37 groups. The first group is screened with 193 meshes, and then the number of meshes of each group of pulp screening is increased by 23 in turn. After each group of pulp is screened, the screened and unscreened materials are tested again. The results show that the amount of barite in the sieved materials in groups 1 to 37 is greater than 95%. Therefore, the 37 groups of screened materials are Combined to obtain barite concentrate.

After sorting in Example 2, the obtained concentrate has a rate of 70%; using the method recorded in the document with the patent number ZL201710313231.1, the same minerals are separated, even if they are screened multiple times, the concentrates of the same grade obtained are more The yield is also not more than 30%.

Example 3

The minerals to be separated are sulfur-oxygen mixed lead-zinc ore, and the non-metallic minerals are limestone, quartzite, dolomite, calcite, gypsum, kaolin, etc. The content of metal ore in the minerals to be separated is 40%. The content of non-metallic minerals is 60%. The main metal ores in the minerals to be separated are: galena, white lead ore, vanadite, sphalerite, smithsonite, hydrozinc ore, anisomorphic zinc ore, pyrite, iron oxide ore.

The separation requirement of this embodiment 3 is to separate the non-metallic ores from the raw ore. The separation criterion is achieved when the amount of metallic ore in the resultant is greater than 90%.

Use a spiral chute with a diameter of 200 cm and a spiral groove with 16 turns. Divide the cutter and the receiving chute fastened at the discharge end of the spiral chute into 40 strands with a width of 2.3 cm, and the width of each strand is 2.5% of the width of the discharge end.

The ore to be separated is ground into fine particles with a sieve mesh number of 120, and the ore pulp with a solid-liquid volume percentage of 10% is prepared.

The slurry was continuously fed into the feed port of the spiral concentrator at a flow rate of 19L/s for separation. Tests showed that the total amount of metal minerals in the three slurries near the inner edge of the chute in the receiving trough was greater than 90%, and the 3 slurries were not used subsequently. Pass the next 1st strand (that is, the 4th strand from the inner edge of the chute outwards in the receiving chute) through a test sieve with a mesh number of 121. At this time, the amount of metal minerals passing through the sieve is greater than 90%, and then Pass the pulp through a test sieve with a mesh number of 122. At this time, the amount of metal minerals passing through the sieve is still greater than 90%, and then pass the pulp through a test sieve with a mesh number of 123. When using a test sieve with a mesh number of D of 176 , it is found that the total amount of non-metallic minerals in the fine particles not passed through the screen is not more than 90%, so that R=D-(N+1)=176-(120+1)=55.

The incremental mesh number of each production sieve is F=100%×55=55.

The mesh number T=120+55=175 for screening the first group of pulp during production.

Pass the 1st strand from the inner edge of the pulp strands to be used in the discharge end of the chute (that is, the 4th strand from the outer edge of the chute in the receiving chute) through a sieve with a mesh number of 175, and find that the The material can reach the separation standard, so the 1st and 2nd strands from the inner edge of the pulp strands to be used in the discharge end of the chute (that is, the 4th and 5th strands in the receiving chute from the inner edge of the chute outwards) It was found that the obtained material could still meet the separation standard. Therefore, the first, second and third pulp stocks to be used in the discharge end of the chute were counted from the inner edge. The 3 strands (that is, the 4th, 5th, and 6th strands counted outward from the inner edge of the chute in the receiving chute) were combined, and then sieved through a sieve with a mesh number of 175. It was found that the obtained material could still meet the separation standard, so the chute was removed. The 1st, 2nd, 3rd and 4th strands from the inner edge of the pulp strands to be used in the material end (that is, the 4th, 5th, and 6th strands from the inner edge of the chute in the receiving chute) and 7 shares) were combined, and then sieved through a sieve with a mesh number of 175. At this time, it was found that the obtained material could not reach the separation standard, so the number of shares M=4-1=3 should be combined during production.

Production: As mentioned above, the separation requirement of this example 3 is to separate the non-metallic ores from the raw ore. The separation criterion is achieved when the amount of metallic minerals in the resultant is greater than 90%.

The pulp flow rate was 19L/s. After being separated by the spiral beneficiation equipment for the first time, the inspection of each strand of ore pulp in the feeding tank shows that the total amount of metal minerals in the three strands near the innermost edge of the chute in the slurry of the feeding trough is greater than 90%, so the subsequent production process. , all lead out the above 3 strands as concentrate without screening. In the remaining pulp, each continuous 3 strands of pulp are combined into one group, which are recorded as the first group, the second group, the third group, ..., the 12th group, and the last group has only one strand, a total of 13 groups. The first group is sieved with 175 mesh, and then the number of sieves of each group of pulp screening is increased by 55 in turn. After each group of pulp is screened, the screened and unscreened materials are tested again, the materials that have reached the separation standard are respectively taken out and merged, and the materials that do not meet the requirements are sorted again by this method until they meet the requirements.

After sorting in Example 3, under the condition of the same total metal recovery rate, the concentrate grade is more than twice that of the method described in the document with the patent number of ZL201710313231.1.

Example 4

The minerals to be separated are coal gangue, which is composed of coal minerals, diaspore, kaolin, hydromica, pyrite, chalcopyrite, marcasite, etc., and the coal minerals account for 8%.

The separation requirement of this Example 4 is to separate the coal minerals from the raw ore. The separation criterion is achieved when the amount of coal minerals in the resulting material is less than 0.2% or greater than 99.8%.

Use a spiral chute with a diameter of 200 cm and 10 spiral groove turns. Divide the cutter and the receiving chute fastened at the discharge end of the spiral chute into 20 strands with a width of 4.7 cm, and the width of each strand is 5% of the width of the discharge end.

The ore to be separated is ground into fine particles with a sieve mesh number of 35, and the ore pulp with a solid-liquid volume percentage of 7% is prepared.

The slurry is continuously fed into the feed port of the spiral concentrator at a flow rate of 12L/s for separation. The test showed that the coal mineral content of 12 slurries near the inner edge of the chute in the receiving chute was less than 0.2%, and these 12 slurries were not used subsequently. Pass the next 1st strand (that is, the 13th strand counted from the inner edge of the chute outwards in the receiving chute) through a test sieve with a mesh number of 36. At this time, the sieved material reaches the separation standard, and then the slurry is passed through the mesh. The test sieve with the number of 37, at this time, the material obtained by sieving still meets the separation standard, and then the pulp is passed through the test sieve with the mesh number of 38, ..., when the test sieve with the mesh number D of 126 is used, it is found that the sieved obtained The material did not meet separation criteria, so R=D-(N+1)=126-(35+1)=90.

The incremental mesh number of each production sieve is F=80%×90=72.

The mesh number T=35+72=107 for screening the first group of pulp during production.

The 1st strand from the inner edge of the pulp strands to be used in the discharge end of the chute (that is, the 13th strand from the inner edge of the chute in the receiving chute) is screened through a sieve with a mesh number of 107. The amount of coal minerals in the fine particles of the screen is less than 0.2%, so the first and second strands from the inner edge of the pulp strands to be used in the discharge end of the chute (that is, in the receiving chute from the inner edge of the chute outwards) The 13th and 14th strands counted) were combined, and then sieved through a sieve with a mesh number of 107. It was found that the material obtained by sieving reached the separation standard, so the pulp strands to be used in the discharge end of the chute were counted from the inner edge. The 1st, 2nd and 3rd strands (that is, the 13th, 14th and 15th strands counted from the inner edge of the chute outwards in the receiving chute) were combined, and then sieved through a sieve with a mesh number of 107, and the sieved ones were found. The material still reaches the separation standard, so the 1st, 2nd, 3rd and 4th strands from the inner edge of the pulp strands to be used in the discharge end of the chute (that is, from the inner edge of the chute to the The 13th, 14th, 15th and 16th stocks from the outside) were combined, and then sieved through a sieve with a mesh number of 107. It was found that the material obtained by sieving still reached the separation standard, so the pulp stocks to be used in the discharge end of the chute were automatically The 1st, 2nd, 3rd, 4th and 5th strands counted from the inner edge (that is, the 13th, 14th, 15th, 16th, and 17th strands counted from the inner edge of the chute in the receiving chute) ), and it is found that the material obtained by sieving does not meet the separation standard, then the number of shares M=5-1=4 should be combined during production.

Production: As mentioned above, the separation requirement of this embodiment 4 is to separate the coal minerals from the raw ore, and the separation standard is achieved when the amount of coal minerals in the obtained material is less than 0.2% or greater than 99.8%.

The pulp flow rate was 12L/s. After being separated by the spiral beneficiation equipment for the first time, the inspection of each strand of ore pulp in the feeding tank shows that the amount of coal minerals in the 12 strands near the innermost edge of the chute in the slurry of the feeding trough is less than 0.2%, so in the subsequent production process, All of the above 12 strands were extracted as concentrates without screening. In the remaining pulp, each continuous 4 strands of pulp are combined into one group, which are recorded as the first group and the second group in turn. The first group was sieved with 107 mesh, and the second group was sieved with 107+72=179 mesh. After the two groups of pulp were screened, it was found that the separation standard had been reached.

Using the method described in the document with the patent number ZL201710313231.1 to separate the same minerals, not only the cost is more than twice that of the present embodiment, but also the separated coal minerals are too fine, making subsequent processing difficult.

Claims (6)

1. a kind of high-efficiency and high-quality beneficiation method that carries out gravity separation screening with spiral beneficiation equipment, it is characterized in that according to the following steps: (1) Divide the spiral concentrator with the discharge pipe closed, or the discharge end of the spiral chute into multiple shares, and the width of each share is 1.25%-5.0% of the width of the discharge end; Grind the mineral material to be separated into fine particles with a sieving mesh number of N; (2) When carrying out production separation, let the minerals consist of A and B, and A and B can each be one or more minerals. According to the condition of the original ore and the requirements of subsequent processing, determine the A and/or B in the material obtained after separation. A certain content of it is used as the separation standard; First, use the spiral beneficiation equipment to separate the pulp once, and test each strand of pulp in the feeding chute. If one or more strands of pulp near the inner edge of the chute have reached the separation standard, the subsequent production will lead out these strands of pulp as The separation result will not be screened. If the separation standard is not met, the pulp strands will be retained; the pulp strands that do not meet the separation standard will be screened, and the pulp strands to be screened will be screened from the inner edge of the chute outwards for every continuous M strands. Combined into one group to get group 1, group 2, group 3, ..., but the number of pulp strands in the last group combined can be equal to or less than M; each group of pulp is then screened with a production screen by If the production sieve of group 1 is T mesh, the production sieve of group 2 is T+F mesh, the production sieve of group 3 is T+2F mesh, the production sieve of group 4 is T+3F mesh, and so on By analogy; after each group of pulp is screened, the screened and unscreened materials are tested again. For the pulp group that does not meet the separation standard, the screened and unscreened materials are combined respectively, and then sent to the spiral beneficiation equipment for separation. , the materials of each group that meet the separation standard are combined according to the sieved and unscreened materials to obtain the separation result; (3) The number of shares M of each group of pulp should be combined during production, the mesh number T of the first group of pulp to be screened, and the incremental mesh number F of each production sieve is determined by experiment and calculation. The method is: Prepare a series of test sieves in advance, with 30 meshes as the first level, then the number of sieves of each level of test sieves is increased by 1 mesh, the next level, namely the second level test sieve, is 31 meshes, and the third level test sieve is 32 meshes. Mesh, ..., the last level is 1000 mesh; The pulp is continuously fed into the feeding end of the spiral beneficiation equipment with the same specifications as used in production for separation, and each group of pulp obtained at the discharge end is tested. If one or more pulps close to the inner edge of the chute reach the separation standard Then do not use these pulp strands, if the separation standard is not met, then use these pulp strands; then pass the first strand counted from the inner edge of the chute to a test sieve with a mesh number of N+1 among the pulp strands that still need to be used , if the material obtained after screening does not meet the separation standard, the high-efficiency and high-quality beneficiation method will not be used. If it can meet the separation standard, the pulp stock will be passed through the next level, then the next level, and so on. A test sieve; when the material sieved with a test sieve with a mesh number of D does not meet the separation standard, the parameter R=D-(N+1), The incremental mesh number F of each production sieve is: When R=10-30, F=100%R; When R=31-50, F=(90%-100%) the rounded integer of the value of R; When R=51-70, F=(60%-100%) the rounded integer of the value of R; When R=71-90, F=(50%-100%) the rounded integer of the value of R; When R=91-110, F=(40%-100%) the rounded integer of the value of R; When R≥111, F=(35%-100%) the rounded integer of the value of R; The mesh number T=N+F for screening the first group of pulp during production; Then pass the 1st strand from the inner edge of the pulp strands still to be used through a sieve with a mesh number of T. If the material sieved by the test sieve reaches the separation standard, the 1st strand from the inner edge of the chute shall be screened. The 1st and 2nd pulps are combined, and then sieved through a sieve with a mesh number of T, ... until the material sieved by the test sieve does not meet the separation standard, then the number of shares merged through the sieve minus 1 is the production When the number of shares M shall be consolidated; The slurry flow during production is the same as when M, T, F are determined. 2. the high-efficiency and high-quality beneficiation method that uses the spiral beneficiation equipment to carry out the combination of gravity screening and screening as claimed in claim 1, it is characterized in that the use diameter is not less than 60 centimeters, the spiral beneficiation equipment of 6-21 spiral groove turns, ore pulp The concentration is 6%-12% by volume of solid and liquid. 3. The high-efficiency and high-quality beneficiation method using spiral beneficiation equipment for combined gravity screening and screening as claimed in claim 1 is characterized in that the mineral to be separated is laterite type weathered crust nickel ore. 4. The high-efficiency and high-quality beneficiation method using spiral beneficiation equipment for combined gravity screening and screening according to claim 1 is characterized in that the minerals to be separated are intermediate raw materials for producing chemical barite. 5. The high-efficiency and high-quality beneficiation method using spiral beneficiation equipment for combined gravity screening and screening as claimed in claim 1, characterized in that the minerals to be separated are mixed lead-zinc ore with sulfur and oxygen. 6. The high-efficiency and high-quality beneficiation method using spiral beneficiation equipment for combined gravity screening and screening as claimed in claim 1, characterized in that the mineral to be separated is coal gangue.