A short program that determines the number of leachers needed for the given variables

qleach.go

package main

import (
	"flag"
	"fmt"
	"math"
)

func main() {
	feed := flag.Float64("feed", 1, "the feed flowrate")
	solvent := flag.Float64("solvent", 1, "the solvent flowrate")
	purity := flag.Float64("purity", 1, "percentage w/w of the feed")
	eratio := flag.Float64("entrainment", 0.5, "ratio of entrainment")
	out := flag.Float64("out", 1, "purity at endpoint")
	flag.Parse()

	ore := *purity * *feed
	entr := (*feed - ore) * *eratio

	R := *solvent / entr
	R1 := (*solvent - entr + ore) / entr

	n := math.Log(1+((R-1)/R1)*((1/(1-*out))-1)) / math.Log(R)
	fmt.Printf("actual number: %f. rounded: %f\n", n, math.Ceil(n))
}