阅读说明：本技术 一种井下水回用于白钨矿浮选的方法 (Method for recycling underground water to scheelite flotation ) 是由 谭洁 李茂强 范阿勇 黄长峰 于 2019-11-08 设计创作，主要内容包括：本发明公开了一种井下水回用于白钨浮选的方法,原矿经过一段磨矿分级系统进入重选工序,重选尾矿进入二段磨矿分级系统,经过二段磨矿分级系统矿石进入金锑混合浮选然后进入白钨浮选系统,白钨浮选采用一次粗选、两次精选、三次扫选、中矿顺序返回的工艺流程,其中：除粗选、精选Ⅰ的精矿泡沫冲洗水使用清水外其余补加水均为井下水；碳酸钠和氢氧化钠混合配制添加到白钨浮选的提升搅拌桶内,水玻璃添加到搅拌桶内,皂化油酸添加到搅拌桶、粗选尾矿箱、扫选Ⅰ尾矿箱和精选Ⅰ浮选槽。本发明在不改变浮选工艺路线的前提下,通过调整药剂制度和部分改变补加水制度,使得井下水替代清水回用于选厂生产时,其各项经济指标均能够与清水达到同等水平。(The invention discloses a method for recycling underground water for scheelite flotation, wherein raw ore enters a gravity concentration process through a first-stage ore grinding classification system, gravity tailings enter a second-stage ore grinding classification system, ore enters gold-antimony mixed flotation through the second-stage ore grinding classification system and then enters a scheelite flotation system, and the scheelite flotation adopts the process flows of primary roughing, secondary concentration, tertiary scavenging and middling sequential return, wherein: the concentrate foam flushing water except the concentrate foam flushing water of the rough concentration and the fine concentration I is clean water, and the rest supplementary water is underground water; sodium carbonate and sodium hydroxide are mixed, prepared and added into a lifting stirring barrel for scheelite flotation, water glass is added into the stirring barrel, and saponified oleic acid is added into the stirring barrel, a roughing tailing box, a scavenging I tailing box and a fine flotation tank I. On the premise of not changing the flotation process route, the invention ensures that each economic index of underground water can reach the same level as that of clean water when the underground water is used for production of a separation plant instead of the clean water by adjusting a medicament system and partially changing a water replenishing system.)

1. A method for recycling underground water for scheelite flotation is characterized by comprising the following steps: the method comprises the following steps that raw ore enters a gravity concentration process through a first-stage ore grinding classification system, gravity tailings enter a second-stage ore grinding classification system, ore enters gold-antimony mixed flotation through the second-stage ore grinding classification system and then enters a scheelite flotation system, and the scheelite flotation adopts the process flow of once roughing, twice fine concentration, three times scavenging and middling sequential return, wherein:

the water replenishing system is as follows: the concentrate foam flushing water except the concentrate foam flushing water of the rough concentration and the fine concentration I is clean water, and the rest supplementary water is underground water;

the scheelite flotation reagent system comprises: sodium carbonate and sodium hydroxide are mixed, prepared and added into a lifting stirring barrel for scheelite flotation, water glass is added into the stirring barrel, and saponified oleic acid is added into the stirring barrel, a roughing tailing box, a scavenging I tailing box and a fine flotation tank I.

2. A method of recycling water downhole for scheelite flotation according to claim 1, characterized in that: the raw ore is quartz vein type ore with three metals of gold, antimony and tungsten symbiotic, wherein the scheelite is skarn type ore with high calcite content.

3. A method of recycling water downhole for scheelite flotation according to claim 1, characterized in that: the using amount of the sodium carbonate is 1200-1500 g/t, the using amount of the sodium hydroxide is 250-500 g/t, and the using amount ratio of the sodium carbonate to the sodium hydroxide is 3: 1-5: 1.

4. a method of recycling water downhole for scheelite flotation according to claim 1, characterized in that: the dosage of the water glass is 800-1000 g/t.

5. A method of recycling water downhole for scheelite flotation according to claim 1, characterized in that: the dosage of the saponified oleic acid added into the stirring barrel is 70-84 g/t, the dosage of the saponified oleic acid added into the roughing tailing box is 20-24 g/t, the dosage of the saponified oleic acid added into the scavenging I tailing box is 10-12 g/t, and the dosage of the saponified oleic acid added into the concentration I flotation tank is 5-10 g/t.

Technical Field

The invention belongs to the technical field of underground wastewater treatment, and particularly relates to a method for recycling underground water for scheelite flotation.

Background

The underground wastewater is mainly water seeped into a mine through sandstone fractures in the mining process and generally contains S0i ^2-、Cl ^-1、Ca ²⁺、Mg ²⁺、K ⁺、Na ⁺Plasma, high hardness, alkaline water, partial fine particles and oil substances. The water quality of the water (without purification treatment) in the pit is shown in Table 1.

TABLE 1 Wolff well waste water quality analysis results

Item	Sb	Pb	Cr	As	PH	Electrical conductivity of	Suspended matter
								mg/L	5.2	0.18	0.03	0.23	8	127	79

Compared with the national standard of surface water quality, namely the Integrated wastewater discharge Standard (GB18918-2002), Suspended Substances (SS), As, Pb and Sb in underground water exceed standards and cannot be directly discharged. The company selects plants to process the gold-antimony-tungsten symbiotic ore, the metal minerals of the gold-antimony-tungsten symbiotic ore mainly comprise natural gold, stibnite, scheelite and the like, and the gangue minerals of the gold-antimony-tungsten symbiotic ore mainly comprise quartz. The beneficiation treatment capacity is 1000t/d, and 4-5 t of water is needed for treating each ton of ores. At present, the underground water seepage amount of a company is about 4000-7000 t/d, underground water needs to be discharged to the ground for ensuring underground safe production, the external water discharge amount is 4000-7000 t/d, and the underground water amount in a dry period is less and the water amount in a rich period is larger. If the underground water is used for selecting plants, the discharge amount of the waste water can be reduced, the treatment cost of the waste water can be reduced, and the pressure of water-saving resource shortage in arid seasons can be relieved.

However, as shown in table 2, when the underground water is used for the production in the plant selection, the indexes of the gold and antimony flotation in the plant selection are not negatively affected, but the indexes of the white tungsten flotation in the plant selection are obviously affected, and the indexes are increased by about 0.04% compared with the indexes of the tailings when the clean water is used.

TABLE 2 Experimental results of using the underground water in the production of selecting factories

The reasons for this are mainly divided into the following three points:

1. the underground wastewater contains more metal ions and micro-fine particle suspended matters, and the metal ions and the suspended matters can be adsorbed to the surface of useful ore, so that the flotation process is interfered, and the flotation index is influenced.

2. Metal ions in the underground wastewater can produce precipitates with saponified oleic acid, sodium carbonate and other agents, so that the effect of the agents in flotation is influenced, and the flotation index is influenced.

3. The water glass is a dispersant and a gangue mineral inhibitor commonly used in scheelite flotation, and HSiO in the water glass ₃ ^-And the sodium silicate colloidal particles are adsorbed on the surface of the mineral, so that the hydrophilicity of the mineral is inhibited, and the adsorption heat negatively charged sodium silicate colloidal particles and ore particles are mutually exclusive to play a dispersing role; compared with clear water, underground water contains more suspended matters, is easy to cover the surface of useful minerals, and reduces the floatability and the selectivity of the collecting agent of the useful minerals.

Therefore, the method has very important significance on the influence of the increase of the index of the scheelite flotation tailings when the underground water is reused for the production of the dressing plant.

Disclosure of Invention

The invention aims to provide a method for reusing underground water in scheelite flotation, aiming to solve the problem that the existing underground water reuse influences the technical indexes of scheelite flotation in a plant, and the method is characterized in that on the premise of not changing the flotation process route, the chemical system is adjusted and the water replenishing system is partially changed, so that when underground water is reused in the plant production instead of clean water, all economic indexes of the underground water can reach the same level as that of the clean water, the waste water discharge and treatment are reduced, the consumption of surface clean water is reduced, and good social benefits and economic benefits are achieved.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

a method for recycling underground water for scheelite flotation includes that raw ore enters a gravity concentration process through a first-stage ore grinding classification system, gravity tailings enter a second-stage ore grinding classification system, ore enters gold-antimony mixed flotation through the second-stage ore grinding classification system and then enters a scheelite flotation system, and the scheelite flotation adopts the process flows of primary roughing, secondary concentration, tertiary scavenging and middling sequential return, wherein:

the water replenishing system is as follows: the concentrate foam flushing water except the concentrate foam flushing water of the rough concentration and the fine concentration I is clean water, and the rest supplementary water is underground water;

the scheelite flotation reagent system comprises: sodium carbonate and sodium hydroxide are mixed, prepared and added into a lifting stirring barrel for scheelite flotation, water glass is added into the stirring barrel, and saponified oleic acid is added into the stirring barrel, a roughing tailing box, a scavenging I tailing box and a fine flotation tank I.

In a preferred scheme, the raw ore is quartz vein type ore with three metals of gold, antimony and tungsten symbiotic, wherein the scheelite is of a skarn type with high calcite content.

It should be noted that the content of calcite in the skarn-type scheelite according to the present invention is higher than the content of fluorite in the ore.

In a preferable scheme, the using amount of the sodium carbonate is 1200-1500 g/t, the using amount of the sodium hydroxide is 250-500 g/t, and the using amount ratio of the sodium carbonate to the sodium hydroxide is 3: 1-5: 1.

In a preferable scheme, the using amount of the water glass is 800-1000 g/t.

In the preferable scheme, the dosage of the saponified oleic acid added into the stirring barrel is 70-84 g/t, the dosage of the saponified oleic acid added into the roughing tailing box is 20-24 g/t, the dosage of the saponified oleic acid added into the scavenging I tailing box is 10-12 g/t, and the dosage of the saponified oleic acid added into the concentrating I flotation tank is 5-10 g/t.

In the invention, except for the concentrate foam flushing water used in roughing and concentrating I, clear water (accounting for about 5% of the total water consumption) is used as well water (accounting for about 95% of the total water consumption), and considering that the concentration flotation is low and the grade is relatively high (the ore grade is improved by about 10 times compared with the original ore), in order to reduce the influence of the suspended matters in the well water on the surface of the ore, the concentrate foam flushing water used in roughing and concentrating I is clear water; if the underground water is used, the concentration foam amount is small, the yield is low, the concentrate grade is abnormal, the tailing index is abnormally increased and is about 0.065 percent (the normal tailing index is lower than 0.40 percent).

When the underground water is reused for production in a separation plant, on the premise of not changing a process route, a medicament system is changed, sodium carbonate added in a lifting stirring barrel of the scheelite flotation is replaced by a mixed medicament of sodium carbonate and sodium hydroxide (the amount of the sodium carbonate is consistent), newly-added saponified oleic acid addition points are carefully selected I, the obtained test indexes are closer to the indexes of using clear water, the deviation is not large, particularly, the tailing indexes are stable, the grade is below 0.04%, and the quality of concentrate meets the production requirements and is closer to the production indexes.

The method is characterized in that a saponification oleic acid dosing point is newly added at a concentration I position, 80% -90% of useful components in ores enter rough concentration concentrate, the rough concentration concentrate enters the concentration I for secondary enrichment, and saponification oleic acid is added in the concentration in order to ensure that the useful minerals float upwards in time and enter the concentrate. And when the saponified oleic acid is not added, the foam amount generated by concentration is small, the yield of the concentrate is low, and the tailing index is relatively increased.

Compared with the prior art, the invention has the advantages that:

(1) on the premise of not changing a flotation process route, the invention ensures that each economic index of underground water can reach the same level as that of clean water when the underground water is reused for production in a plant selection by adjusting a medicament system and partially changing a water replenishing system;

(2) the underground drainage of the company reaches 4000-7000 t/d, the daily water consumption of a plant selection is about 5000 tons, and the average underground water of about 4800t/d all the year is recycled for the production of the plant selection, so that the waste water discharge and treatment are reduced, and the consumption of surface clear water is reduced; the general industrial wastewater treatment cost is 1.6 yuan/t, the wastewater treatment cost is reduced by 4800t/d 320d 1.6 yuan/t 245.76 ten thousand, and the annual benefit is about 195.76 ten thousand yuan if the cost of newly added factory chemicals NaOH and oleic acid is about 50 ten thousand yuan per year.

Drawings

FIG. 1 is a flow chart of a conventional plant selection process of comparative example 2, wherein all of the make-up water is clear water.

Fig. 2 is a production process flow diagram of the plant selection of the embodiment 1 of the invention, wherein all the supplementary water in the dotted line frame is underground water, and the concentrate foam flushing water of the roughing and the fine selection 1 is clear water.

Detailed Description

The present invention is further illustrated by the following examples, which are not to be construed as limiting but illustrative.