CN109321698B - Batching method capable of effectively improving mixing and stacking efficiency - Google Patents

Abstract

The invention discloses a burdening method capable of effectively improving mixing and stacking efficiency, which is characterized by comprising the following steps of: the batching method adopts a BLOCK stacking operation mode to carry out batching in groups according to the principle of similar components, the number of BLOCKs is 4-5, and the batching is divided into 4 BLOCKs or 4+1 BLOCKs, wherein 1 represents a mobile BLOCK, and varieties with poor logistics performance and the proportion of less than 5 wt% in a ore blending structure are placed into the mobile BLOCKs. The method can effectively solve the problems of difficult production organization under complex ore blending structures such as multiple ore blending products, large component fluctuation, poor logistics performance of partial varieties and the like, improves the stacking efficiency, obviously improves the quality and the yield of the uniformly mixed ore, and meets the production requirements of the next procedure.

Description

Batching method capable of effectively improving mixing and stacking efficiency

Technical Field

The invention belongs to the technical field of blast furnace smelting, and particularly relates to a burdening method capable of effectively improving mixing and stacking efficiency.

Background

The sintered ore is an important component of blast furnace burden, the proportion of the sintered ore is usually over 60 percent, and the quality of the sintered ore directly influences the condition, yield and quality of the blast furnace. Mixing of the SiO of the ore in the sintering process₂The fluctuation directly affects the basicity (CaO/SiO) of the sinter₂) And the TFe fluctuation affects the iron content stability of the sintered ore. Therefore, supplying the blended ore with stable components and particle sizes to the sintering machine plays an important role in simplifying the operation of sintering and batching and stabilizing the quality of the sintered ore, and is a necessary condition for long-term stability and high yield of the blast furnace. The blending and stacking are one of the most effective ways for improving the physical and chemical component stability of blended ores, most steel enterprises are equipped with modern comprehensive raw material yards, and the blended ores with uniform components are output after the raw materials with different components are blended through reasonable application of blending, stacking and material taking processes, so that the production requirements of the subsequent processes are met.

However, with the excess of steel production, the steel industry is competitive, and the cost war also becomes the war of survival of each steel mill. In order to reduce the production cost, the structure of the blending material is increasingly deteriorated. In order to solve the problem of solid waste disposal, oil, mud, ash and the like generated in the next process are simply processed and then enter a stock yard, and participate in uniformly mixing ingredients in the mode of dust-mud mixture ingredients and iron dust-mud, meanwhile, domestic comprehensive ore powder, high-phosphorus powder and the like have high moisture, high viscosity and unstable quality, imported ore concentrates such as Brazil ore concentrate and SIC ore concentrate have high moisture content and poor logistics performance, main ore resources in the imported ore concentrates such as King powder, Yangdi powder, Nuo powder and the like continuously slide down in quality, the varieties are multiple, the raw material conditions are more complex, the production of uniformly mixed ore is seriously influenced, and the difficulty in controlling the amount of uniformly mixed mineral matter is further increased.

How to utilize the equipment facilities of the existing blending system and on the premise that the mineral content of the blended ore meets the production requirement of the subsequent process, the stacking efficiency is stably improved, so that the yield of the blended ore meets the production requirement of iron making, and the method has important significance.

Disclosure of Invention

The invention aims to provide a blending method capable of effectively improving blending and stacking efficiency aiming at complex ore blending structures with multiple blending product numbers, large component fluctuation, poor logistics performance of partial varieties and the like, so that the quality and the yield can meet the production requirements of the subsequent processes at the same time.

In order to achieve the purpose, the batching method capable of effectively improving the blending and stacking efficiency is designed, the batching method adopts a BLOCK stacking operation mode to carry out batching in groups according to the principle of similar components, the number of BLOCKs is 4-5, and the batching method is divided into 4 BLOCKs or 4+1 BLOCKs, wherein 1 represents a mobile BLOCK, and varieties with poor logistics performance in a ore blending structure and the proportion of less than 5 wt% are placed into the mobile BLOCK; the number of the large piles of the materials participating in the batching is m, the number of the material bins is n, both m and n are natural numbers, and the specific batching process is as follows:

1) when m is less than n, executing according to four BLOCKs, and simultaneously batching all varieties in the whole process, namely, the batching plans of 4 BLOCKs are the same;

when m is larger than or equal to n, executing according to four BLOCKs, and theoretically satisfying that m is larger than or equal to n by 4(n-1) at least one spare bin; in fact, the total amount of different varieties of materials used in a large pile is different, namely the total proportion is different, so that one BLOCK can only completely consume one variety, namely when four BLOCKs are executed, the following relation (n-1) +4 is more than or equal to m and more than or equal to n is satisfied;

when m is equal to n, three of the BLOCK ore blending structures are the same, and the other BLOCK ore blending structure is different;

when m is n +1, two of the BLOCK ore blending structures are the same, and the other two BLOCK ore blending structures are different respectively;

when m is n +2 or m is n +3, the four BLOCK ore blending structures are different;

2) single BLOCK allocation method: according to the principle of component phase approximation, the method specifically comprises the following steps:

determining the number of instances m of a single BLOCK_BLOCK，m_BLOCKLess than n stock bins and m variety_BLOCK4-6 are arranged;

after the single variety and the variety quantity of the single BLOCK are selected, the proportion of the single variety needs to meet the principle that the components of the BLOCK are the same as or similar to the components of the mixing and stacking.

Further, after the batching method is completed, a mathematical model is established, and a feeding line on a bin is subjected to timed queuing decision feeding, wherein the specific queuing decision feeding process comprises the following steps:

when the stock of a certain variety is reduced to Q_kWhen the time is T, a feeding plan is sent out, and the corresponding time is T_kDue to a lead period T_fThe inventory continues to drop to Q_minLead period T_fAfter that, the stock starts to rise to Q_uIn the meantime, the material taking machine stops taking the materials, and at the moment, the late lag T exists_bWill continue to rise to Q_maxLate lag phase T_bEnd and lead period T of vestibule feeding_f＝-T_k＝Σ(T_i,i+1)+ΣL_iV, late lag phase T of vestibule feed_b＝T_max-T_u＝ΣL_i/v；

Wherein Q is_maxTo maximum stock, Q_minTo minimum stock, Q_kFor stock, Q, in the planning of material supply_uTo issue the stock when stopping the feeding plan; t is_minTime of minimum stock, T_maxTime when the stock reached maximum, T_kTime when the supply is planned for, T_uFor the time when the feeding stop plan is issued, (T)_i,i+1) And the time interval between the starting of the ith belt and the starting of the (i + 1) th belt, namely starting delay, Li is the length of the material conveying section of the ith belt, and v is the running speed of the corridor belt.

Further, in the step 1), if the ore blending structure contains varieties with poor logistics, a mobile BLOCK is added on the basis of four BLOCKs, and the varieties with poor logistics are arranged to be used in the mobile BLOCK.

Further, in the step 2), because the material flow is too small when the raw material with the mixture ratio of less than 2 wt% participates in the batching, the BLOCK batching method is adopted, and the mixture ratio of the variety with the mixture ratio of less than 2 wt% is converted into the mixture ratio of more than or equal to 2 wt% to participate in partial BLOCK batching, and the conversion method specifically comprises the following steps:

setting the total weight of the large pile to be Q_{Large pile}The weight of BLOCK matched with small proportion of variety raw material is q_SmallThe whole batch ratio of the variety is P_All-purposeThen the ratio P of the ore species in the BLOCK_BLOCK＝P_All-purposeQ_{Large pile}/q_Small。

Compared with the prior art, the invention has the following beneficial effects: the batching method can effectively solve the problem of difficult production organization under complex ore blending structures such as multiple ore blending products, large component fluctuation, poor logistics performance of partial varieties and the like, improves the stacking efficiency, obviously improves the quality and the yield of the blended ore, and meets the production requirements of the next procedure.

Drawings

FIG. 1 is a schematic diagram of the change of stock of a certain variety;

FIG. 2 is a flow chart of ingredient planning organization.

Detailed Description

The present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, specific examples and comparative examples, which are not intended to limit the invention.

According to SiO₂、TFe、Al₂O₃The principle of similar main components is adopted to carry out batching in groups by adopting a BLOCK piling operation mode (namely, the component of any BLOCK is the same as or similar to that of the uniform mixing pile), and the BLOCK piling operation mode can solve the problem that the quantity of varieties of the batched materials is smaller than that of the batched materials in a large pile at the same time; production practice shows that the number of BLOCK divided cannot be increased infinitely, and generally no more than five BLOCKs are preferred. According to the blending and ore-blending plan issued by the manufacturing department, the operation mode of BLOCK accumulation can be fixed to be the operation mode of '″ 4' or '4 + 1' ″ BLOCKsIn the formula, "1" is expressed as motor-driven BLOCK, and when the ore blending structure contains poor material flow (the poor material flow refers to the characteristic of easy-to-stick material blockage), the ratio is not large (the ratio is general<5%) of the variety used in heaping. Because the varieties with poor logistics property generally have larger moisture, are easy to stick and are greatly influenced by weather factors, the varieties with poor logistics property are only put into the motorized BLOCK for use, and the motorized BLOCK can flexibly adjust the sequence according to specific time (particularly weather conditions), thereby providing convenience for production.

A can improve the mixing effectively and build the batching method of the heap efficiency, the number of products that a large heap participated in batching is m, the number of feed bins is n, m, n are the natural number, adopt the following measure to solve the number of products and number of feed bins and mismatch the problem:

1) when m is less than n, executing according to four BLOCKs, and simultaneously batching all varieties in the whole process, namely, the batching plans of 4 BLOCKs are the same;

when m is larger than or equal to n, the method is executed according to four BLOCKs, at least one spare bin is arranged to cope with sudden faults in order to ensure the smooth production, so theoretically, 4(n-1) is larger than or equal to m and larger than or equal to n, and accurate batching can not be carried out when m is larger than or equal to 4 (n-1); in fact, in consideration of ore resources, cost and other factors, the total amount (dry weight) of different varieties of materials used in a large pile is generally different, namely the total proportion is often different, so that one BLOCK can only be completely consumed, namely when four BLOCKs are executed, the following relation (n-1) +4 is more than or equal to m and more than or equal to n is satisfied; when m is equal to n, three of the BLOCK ore blending structures are the same, and the other BLOCK ore blending structure is different; when m is n +1, two of the BLOCK ore blending structures are the same, and the other two BLOCK ore blending structures are different respectively; when m is n +2 or m is n +3, the four BLOCK ore blending structures are different;

if the ore blending structure contains varieties with poor logistics, a mobile BLOCK needs to be added on the basis of four BLOCKs, and the varieties with poor logistics are arranged in the mobile BLOCK for use.

2) Single BLOCK allocation method: according to SiO₂、TFe、Al₂O₃And the principle of similar main components, namely the components of any BLOCK are the same as or similar to the components of the uniform mixing and stacking, and the specific operation is as follows:

determining the number of instances m of a single BLOCK_BLOCK，m_BLOCKThe number of the stock bins must be less than n, the number of stock lines entering the stock bins must be considered, the influence on the production efficiency caused by frequent switching of different varieties is avoided, and the number of varieties m_BLOCK4-6 are generally arranged, and can be adjusted according to the actual conditions of the users;

after the single variety and the variety quantity of the single BLOCK are selected, the proportion of the single variety needs to meet the condition that the components of the BLOCK are the same as or similar to the components of the uniform mixing and stacking;

in addition, when the raw materials of small mixture ratio varieties (varieties with the mixture ratio less than 2%) participate in the batching, the material flow is too small (less than 30t/h) and is not in the proper working range of the electronic belt scale, so that the material flow fluctuation is large, the error is large, and the quality of the uniformly mixed ore is not stable, and by adopting a BLOCK batching method, the small mixture ratio varieties are converted into higher mixture ratio (more than or equal to 2%) to participate in partial BLOCK batching, rather than participate in the batching in the whole process, so that the problem of large weighing system fluctuation caused by small material flow is solved; meanwhile, because the number of varieties participating in stacking in the residual BLOCK is reduced, the frequency of switching the warehouse-in varieties is reduced, and the stacking efficiency can be improved. The conversion method specifically comprises the following steps:

setting the total weight of the large pile to be Q_{Large pile}The weight of BLOCK matched with small proportion of variety raw material is q_SmallThe whole batch ratio of the variety is P_All-purposeThen the ratio P of the ore species in the BLOCK_BLOCK＝P_All-purposeQ_{Large pile}/q_Small；

3) And (3) applying a JIT theory, establishing a mathematical model, carrying out timing queuing decision on the feeding lines on the bins, and determining the optimal feeding sequence and feeding quantity. The basic principle is that the supply is required, and the supply is not increased or decreased; the products are not delivered early or late, the delivered varieties need to ensure the quality individually, and no waste products can be produced. Arranging each variety in corresponding goods yard according to ore-blending plan, when mixing production, there is a certain time T for the raw material to be transported to corresponding bin after the material supply plan is executed and the material supply plan is executed_fReferred to as the lead period; the time T from the time when the material taking machine stops taking the materials to the time when the materials along the line enter the storage bin after the feeding plan is given_bReferred to as the late lag phase.The influence of the lead period and lag period should be fully considered when establishing the mathematical model. As shown in fig. 1: q_maxTo maximum stock, Q_minTo minimum stock, Q_kFor the planned supply (i.e. low warning stock), Q_uTo issue the stock when stopping the feeding plan (namely high-level early warning stock);

when the stock of a certain variety is reduced to Q_kWhen the time is T, a feeding plan is sent out, and the corresponding time is T_kInventory continues to drop to Q due to the effect of lead time_minAt the end of the lead period, inventory begins to rise to Q_uWhen the material taking machine stops taking the materials, the inventory continues to rise to Q due to the influence of the lag phase_maxAnd the later lag phase is finished, under the condition, the feeding batch is minimum, the batch is maximum, the corridor running time is shortest, the running efficiency is highest, and the condition is an ideal state;

when the material is supplied to the proportioning bin,

Q_maxthe product is stored when the bin capacity of a certain variety reaches 80%;

Q_minthe stock is the stock when the bin capacity of a certain variety is reduced to 20 percent;

lead period T of vestibule feeding_f＝-T_k＝Σ(T_i,i+1)+ΣL_i/v；

Late lag phase T of vestibule feed_b＝T_max-T_u＝ΣL_i/v；

Wherein: t is_minTime of minimum stock, T_maxTime when the stock reached maximum, T_kTime when planning for delivery, T_uFor the time when the feeding stop plan is issued, (T)_i,i+1) And the time interval between the starting of the ith belt and the starting of the (i + 1) th belt, namely starting delay, Li is the length of the material conveying section of the ith belt, and v is the running speed of the corridor belt.

In fig. 1, the slope of the inventory change line plot: the slope of the stock descending section is the consumption speed of the raw material of the variety, the slope of the stock ascending section is the difference between the feeding speed and the consumption speed of the variety, the feeding speed is displayed by an electronic scale, the consumption speed is equal to eta multiplied by alpha%, eta is the material flow of the set aggregate belt, and alpha% is the mixture ratio of the set variety.

The above is an ideal condition when the operation line is not influenced by the feeding of other varieties, and the operation line can be used vigorously when a single variety is supplied to the front of a single material line. Each variety required by blending and stacking is decomposed into each stockline according to the proportion, and each stockline determines the feeding time and the feeding amount of each batch according to the production maintaining time of the corresponding variety, so that the complicated blending and feeding problem is simplified, and the stacking and feeding can be organized according to a raw material plan organization flow chart (figure 2):

checking inventory Q of a single variety i_iIf Q is_i>Q_kiThe variety i can be fed without any material temporarily, and the stock of other varieties j is continuously checked; if Q_i≤Q_kiThe early warning of low level of stock means that the plan for starting material supply is issued, whether a free stockline exists is checked firstly, if the free stockline exists, the variety i starts material supply; if no idle stockline exists, checking the stock condition of other varieties j, stopping the feeding of the variety j with the stock high-level alarm, drawing out the idle stockline, and starting the feeding of the variety i;

②Q_i<Qu_ithe variety i continues to feed, when in stock Q_i≥Q_uiNamely, the high-level early warning of the stock means that the feeding stop plan is issued, and the variety i stops feeding.

The simulation analysis was performed with reference to the raw materials plan organization flow chart 2 as follows:

table 1 summary of simulation data

The flow of the heap-forming material set in table 1 is 1700t/h, and the time required for each bin change of the variety is 0.167h, as can be seen from table 1:

firstly, 6 varieties, namely when the imported fine ore and the concentrate flow are 1000t/h, can meet the requirement of continuous stacking of the stacking material flow 1700t/h of a stacker, but the feeding line of the trough is quite tense, the time for maintaining and maintaining the feeding point is short, and the number of times of trough replacement is small, so that the effective operation rate of the feeding line of the trough is very high and reaches 85.00 percent, and the requirement is difficult to achieve in practice.

And secondly, when the material flows of 6 varieties of imported fine ores and concentrates are 1100t/h and 1000t/h respectively, the requirement of a stacker for continuous stacking of the material flow of 1700t/h can be met, proper maintenance time is given, the number of times of groove replacement is moderate, the effective operation rate of a material line of a feeding groove is high and is between 75 and 80 percent, and the requirement in practice is high.

And thirdly, when the material flows of the imported fine ores and the concentrate are 1200t/h and 1000t/h respectively, the requirement of the stacker for continuous stacking of the material flow 1700t/h can be well met, the maintenance and maintenance time is sufficient, the time for replacing the grooves is moderate, the effective operation rate of the material line of the grooves is not high, and the requirement is easily met in practice within 70-74%.

5 varieties, when the imported fine ore and the concentrate flow are respectively 1100t/h and 1000t/h, the requirement of a stacker for continuous stacking of the flow of the stacking material 1700t/h can be well met, relatively sufficient maintenance time is provided, the number of times of groove replacement is obviously reduced, the effective operation rate of a material inlet line of a groove is moderate and basically within 80 percent, and the requirement is easily met in practice because of fewer varieties and obvious sense of much relaxation and much leeway in the process of organizing feeding production.

Through the optimization simulation experiment, powerful support is provided for production organization decision, direction is provided for subsequent work, and a good guiding effect is achieved for actual production organization.

The following describes in detail the blending method of the present invention for effectively improving the efficiency of blending and stacking with reference to example 1.

Example 1

Ore blending schedule table 1 received to manufacturing department:

TABLE 1 Ore blending Schedule

Firstly, analyzing a ore blending structure: 8 proportioning bins are configured in a certain mixing system, wherein the discharging capacity of the No. 1-6 bin is 150-600 t/h, the discharging capacity of the No. 7-8 bin is 20-200 t/h, and the mixing stacking material flow is 1700t/h, so that the usable proportioning range of the No. 1-6 bin is 8% -35%, and the usable proportioning range of the No. 7-8 bin is 2-11%. The ore blending plan has 8 varieties, the number of the varieties is equal to that of the blending bins, the iron dust and mud with poor logistics property are contained, and the two points can see that the operation mode of 4+1 BLOCKs is adopted;

second, according to the SiO₂In principle, the principle that other components are as close as possible is firstly made into a mobile BLOCK plan, as shown in tables 2 and 3, the iron dust mud has poor fluidity, and the proportion P in the mobile BLOCK is_BLOCK＝P_All-purposeQ_{Large pile}/q_Small＝3×14/3＝14；

And thirdly, the plan contains iron ore and miscellaneous ores with small proportion of ore species, and the iron ore and miscellaneous ores are concentrated in BLOCK2 for use, as shown in Table 2, and as can be seen from Table 2, 4 BLOCKs are left except for the mobile BLOCK, wherein 2 BLOCKs are the same, and the remaining 2 BLOCKs are different.

TABLE 2 Job Pattern mining plans for "4 + 1" BLOCKs

TABLE 3 comparison of the ingredients before each BLOCK

And fourthly, applying a JIT theory to establish a mathematical model, carrying out timing queuing decision on the feeding lines on the bins, and determining the optimal feeding sequence and the optimal feeding quantity. The BLOCK1, BLOCK3, BLOCK4 and mechanical BLOCK are all 5 varieties, when the imported fine ore and concentrate flows are 1100t/h and 1000t/h respectively, the continuous stacking requirement of a stacker stacking flow 1700t/h can be well met, relatively sufficient maintenance and maintenance time is provided, the frequency of bin changing is obviously reduced, the effective operation rate of a bin feeding line is moderate and basically within 80%, because the varieties are few, the requirement is obviously felt much easier and much more leeway in the organizing and feeding production process, and the requirement is easily met in practice. BLOCK2 is 6 varieties, when the imported fine ore and concentrate flows are 1100t/h and 1000t/h respectively, the continuous stacking requirement of the stacker flow 1700t/h can be met, proper maintenance and maintenance time is given, the time for changing the groove is moderate, the effective operation rate of a groove feeding line is high, and the requirement is high in practice between 75% and 80%.

After the material is prepared by the method, the qualification rate of SiO2 +/-0.4 of the blending ore is improved from 91% to 92.1%, the qualification rate of TFe +/-0.5 is improved from 89.7% to 90.9%, the actual blending and stacking time is reduced from 128h to 119h, the stacking efficiency is obviously improved, and sufficient time is gained for equipment process repair.

All the proportions and proportions are in weight percent.

Claims (4)

1. A batching method capable of effectively improving mixing and stacking efficiency is characterized in that: the batching method adopts a BLOCK stacking operation mode to carry out batching in groups according to the principle of similar components, the number of BLOCKs is 4-5, and the batching is divided into 4 BLOCKs or 4+1 BLOCKs, wherein 1 represents a mobile BLOCK, and varieties with poor logistics performance and the proportion of less than 5 wt% in a ore blending structure are placed in the mobile BLOCK; the number of the large piles of the materials participating in the batching is m, the number of the material bins is n, both m and n are natural numbers, and the specific batching process is as follows:

1) when m is less than n, executing according to four BLOCKs, and simultaneously batching all varieties in the whole process, namely, the batching plans of 4 BLOCKs are the same;

when m is larger than or equal to n, executing according to four BLOCKs, and satisfying the following relation (n-1) +4, wherein m is larger than or equal to n, by at least one spare bin;

when m is equal to n, three of the BLOCK ore blending structures are the same, and the other BLOCK ore blending structure is different;

when m is n +1, two of the BLOCK ore blending structures are the same, and the other two BLOCK ore blending structures are different respectively;

when m is n +2 or m is n +3, the four BLOCK ore blending structures are different;

2) single BLOCK allocation method: according to the principle of component phase approximation, the method specifically comprises the following steps:

determining the number of instances m of a single BLOCK_BLOCK，m_BLOCKLess than n stock bins and m variety_BLOCK4-6 are arranged;

after the single variety and the variety quantity of the single BLOCK are selected, the proportion of the single variety needs to meet the principle that the components of the BLOCK are the same as or similar to the components of the mixing and stacking.

2. The batching method capable of effectively improving the mixing and stacking efficiency according to claim 1, which is characterized in that: after the batching method is completed, a mathematical model is established, and the material on the bin is fed by a timed queuing decision, wherein the specific queuing decision and feeding process comprises the following steps:

when the stock of a certain variety is reduced to Q_kWhen the time is T, a feeding plan is sent out, and the corresponding time is T_kDue to a lead period T_fThe inventory continues to drop to Q_minLead period T_fAfter that, the stock starts to rise to Q_uIn the meantime, the material taking machine stops taking the materials, and at the moment, the late lag T exists_bWill continue to rise to Q_maxLate lag phase T_bEnd and lead period T of vestibule feeding_f＝-T_k＝Σ(T_i,i+1)+ΣL_iV, late lag phase T of vestibule feed_b＝T_max-T_u＝ΣL_i/v；

Wherein Q is_maxTo maximum stock, Q_minTo minimum stock, Q_kFor stock, Q, in the planning of material supply_uTo issue the stock when stopping the feeding plan; t is_minTime of minimum stock, T_maxTime when the stock reached maximum, T_kTime when the supply is planned for, T_uFor the time when the feeding stop plan is issued, (T)_i,i+1) And the time interval between the starting of the ith belt and the starting of the (i + 1) th belt, namely starting delay, Li is the length of the material conveying section of the ith belt, and v is the running speed of the corridor belt.

3. The batching method capable of effectively improving the mixing and stacking efficiency according to claim 1, which is characterized in that: in the step 1), if the ore blending structure contains varieties with poor logistics, adding a mobile BLOCK on the basis of four BLOCKs, and arranging the varieties with poor logistics in the mobile BLOCK for use.

4. The batching method capable of effectively improving the mixing and stacking efficiency according to claim 1, which is characterized in that: in the step 2), because the material flow is too small when the raw materials with the mixture ratio of less than 2 wt% participate in the batching, the BLOCK batching method is adopted, and the mixture ratio of the varieties with the mixture ratio of less than 2 wt% is converted into the mixture ratio of more than or equal to 2 wt% to participate in partial BLOCK batching, and the conversion method specifically comprises the following steps:

setting the total weight of the large pile to be Q_{Large pile}The weight of BLOCK matched with small proportion of variety raw material is q_SmallThe whole batch ratio of the variety is P_All-purposeThen the ratio P of the ore species in the BLOCK_BLOCK＝P_All-purposeQ_{Large pile}/q_Small。

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